diff --git a/corsika/detail/modules/sophia/ParticleConversion.inl b/corsika/detail/modules/sophia/ParticleConversion.inl
new file mode 100644
index 0000000000000000000000000000000000000000..0c9de7b2d06a7bdd00aaa9810c7a470b74e46773
--- /dev/null
+++ b/corsika/detail/modules/sophia/ParticleConversion.inl
@@ -0,0 +1,25 @@
+/*
+ * (c) Copyright 2022 CORSIKA Project, corsika-project@lists.kit.edu
+ *
+ * This software is distributed under the terms of the GNU General Public
+ * Licence version 3 (GPL Version 3). See file LICENSE for a full version of
+ * the license.
+ */
+
+#pragma once
+
+#include <corsika/framework/core/ParticleProperties.hpp>
+
+//#include <sibyll2.3d.hpp>
+
+namespace corsika::sophia {
+
+ inline HEPMassType getSophiaMass(Code const pCode) {
+ if (is_nucleus(pCode)) throw std::runtime_error("Not defined for nuclei.");
+ auto sCode = convertToSophiaRaw(pCode);
+ if (sCode == 0)
+ throw std::runtime_error("getSophiaMass: unknown particle!");
+ else
+ return sqrt(get_sophia_mass2(sCode)) * 1_GeV;
+ }
+} // namespace corsika::sophia
\ No newline at end of file
diff --git a/corsika/modules/Sophia.hpp b/corsika/modules/Sophia.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..85522208b8973d6571d885af7cb5a0d1bbd9e694
--- /dev/null
+++ b/corsika/modules/Sophia.hpp
@@ -0,0 +1,37 @@
+/*
+ * (c) Copyright 2022 CORSIKA Project, corsika-project@lists.kit.edu
+ *
+ * This software is distributed under the terms of the GNU General Public
+ * Licence version 3 (GPL Version 3). See file LICENSE for a full version of
+ * the license.
+ */
+
+#pragma once
+
+#include <corsika/modules/sophia/ParticleConversion.hpp>
+
+#include <corsika/modules/sophia/InteractionModel.hpp>
+
+#include <corsika/framework/process/InteractionProcess.hpp>
+
+/**
+ * @file Sophia.hpp
+ *
+ * Includes all the parts of the Sophia model. Defines the InteractionProcess<TModel>
+ * classes needed for the ProcessSequence.
+ */
+
+namespace corsika::sophia {
+ /**
+ * @brief sophia::Interaction is the process for ProcessSequence.
+ *
+ * The sophia::InteractionModel is wrapped as an InteractionProcess here in order
+ * to provide all the functions for ProcessSequence.
+ */
+ struct Interaction : public InteractionModel, public InteractionProcess<Interaction> {
+ template <typename TEnvironment>
+ Interaction(TEnvironment const& env)
+ : InteractionModel{env} {}
+ };
+
+} // namespace corsika::sophia
diff --git a/corsika/modules/sophia/ParticleConversion.hpp b/corsika/modules/sophia/ParticleConversion.hpp
new file mode 100644
index 0000000000000000000000000000000000000000..a76dadb8cdd255e62a250c3cce80d3264819caa2
--- /dev/null
+++ b/corsika/modules/sophia/ParticleConversion.hpp
@@ -0,0 +1,70 @@
+/*
+ * (c) Copyright 2018 CORSIKA Project, corsika-project@lists.kit.edu
+ *
+ * This software is distributed under the terms of the GNU General Public
+ * Licence version 3 (GPL Version 3). See file LICENSE for a full version of
+ * the license.
+ */
+
+#pragma once
+
+#include <corsika/framework/core/ParticleProperties.hpp>
+#include <corsika/framework/core/PhysicalUnits.hpp>
+
+//#include <sophia.hpp>
+
+#include <string>
+
+namespace corsika::sophia {
+
+ enum class SophiaCode : int8_t;
+ using SophiaCodeIntType = std::underlying_type<SophiaCode>::type;
+
+ // /**
+ // These are the possible projectile for which Sibyll knows the cross section
+ // */
+ // enum class SibyllXSClass : int8_t {
+ // CannotInteract = 0,
+ // Baryon = 1,
+ // Pion = 2,
+ // Kaon = 3,
+ // };
+ // using SibyllXSClassIntType = std::underlying_type<SibyllXSClass>::type;
+
+#include <corsika/modules/sophia/Generated.inc>
+
+ SophiaCode constexpr convertToSophia(Code const pCode) {
+ return corsika2sophia[static_cast<CodeIntType>(pCode)];
+ }
+
+ Code constexpr convertFromSophia(SophiaCode const pCode) {
+ auto const s = static_cast<SophiaCodeIntType>(pCode);
+ auto const corsikaCode = sophia2corsika[s - minSophia];
+ if (corsikaCode == Code::Unknown) {
+ throw std::runtime_error(std::string("SOPHIA/CORSIKA conversion of ")
+ .append(std::to_string(s))
+ .append(" impossible"));
+ }
+ return corsikaCode;
+ }
+
+ int constexpr convertToSophiaRaw(Code const code) {
+ return static_cast<int>(convertToSophia(code));
+ }
+
+ // int constexpr getSibyllXSCode(Code const code) {
+ // if (is_nucleus(code))
+ // return static_cast<SibyllXSClassIntType>(SibyllXSClass::CannotInteract);
+ // return static_cast<SibyllXSClassIntType>(
+ // corsika2sibyllXStype[static_cast<CodeIntType>(code)]);
+ // }
+
+ bool constexpr canInteract(Code const pCode) {
+ return (pCode == Code::Photon ? True : False);
+ }
+
+ HEPMassType getSophiaMass(Code const);
+
+} // namespace corsika::sophia
+
+#include <corsika/detail/modules/sophia/ParticleConversion.inl>
diff --git a/modules/sophia/CMakeLists.txt b/modules/sophia/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..21ed06548a6cd30158bfb72b5088f8b67bc54ca8
--- /dev/null
+++ b/modules/sophia/CMakeLists.txt
@@ -0,0 +1,66 @@
+set (
+ MODEL_SOURCES
+# sibyll2.3d.cpp
+ eventgen.f
+ inpoutput.f
+ jetset74dp.f
+ sampling.f
+ SOPHIA20.f
+ )
+
+#set (
+# MODEL_HEADERS
+# sibyll2.3d.hpp
+# nuclib.hpp
+# )
+
+enable_language (Fortran)
+add_library (Sophia_static STATIC ${MODEL_SOURCES})
+add_library (Sophia SHARED ${MODEL_SOURCES})
+
+set_target_properties (
+ Sophia_static
+ PROPERTIES
+ POSITION_INDEPENDENT_CODE 1
+ )
+
+target_include_directories (
+ Sophia_static
+ PUBLIC
+ $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+ $<INSTALL_INTERFACE:include/corsika_modules/sophia>
+ )
+ target_include_directories (
+ Sophia
+ PUBLIC
+ $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
+ $<INSTALL_INTERFACE:include/corsika_modules/sophia>
+ )
+
+target_link_libraries (
+ Sophia_static
+ PUBLIC
+ gfortran
+ )
+target_link_libraries (
+ Sophia
+ PUBLIC
+ gfortran
+ )
+
+install (
+ FILES
+ ${MODEL_HEADERS}
+ DESTINATION include/corsika_modules/sophia
+ )
+
+install (
+ TARGETS Sophia_static Sophia
+ EXPORT CORSIKA8PublicTargets
+ ARCHIVE DESTINATION lib/corsika
+ LIBRARY DESTINATION lib/corsika # just for cmake 3.10.x (ubuntu 18)
+ )
+
+# add sophia to corsika8 build
+add_dependencies (CORSIKA8 Sophia_static)
+target_link_libraries (CORSIKA8 INTERFACE Sophia_static)
diff --git a/modules/sophia/README.TXT b/modules/sophia/README.TXT
new file mode 100644
index 0000000000000000000000000000000000000000..c4da5a67c28c5d6d18f9d9aff34ec7e8108aacff
--- /dev/null
+++ b/modules/sophia/README.TXT
@@ -0,0 +1,149 @@
+
+
+ SOPHIA 2.0
+ ==========
+
+
+
+A.M"ucke, Ralph Engel, J.P.Rachen, R.J.Protheroe, and Todor Stanev
+
+(astro-ph/9903478, to appear in Comp.Phys.Commun.)
+
+
+Files:
+-----
+
+
+SOPHIA20.f (main program)
+
+eventgen.f (hadronic event generator)
+
+sampling.f (sampling of photon energies)
+
+inpoutput.f (histogramming, input/output)
+
+jetset74dp.f (Lund fragmentation program, changed to double prec.)
+
+rndm.f (random number generator)
+
+testPL.inp (sample input for straight power law calculation)
+
+testBP.inp (sample input for broken power law calculation)
+
+testBB.inp (sample input for black body radiation calculation)
+
+README.TXT (this file)
+
+
+
+
+
+Particle record:
+---------------
+
+
+After event generation the final state particles are found in
+
+ COMMON /S_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+
+NP is the number of particles produced in the last event.
+The particle momenta of particle I in x, y, z directions are
+P(I,1), P(I,2), P(I,3) and P(I,4) is the energy (in GeV).
+The particle mass is stored in P(I,5).
+
+The particle identity is given by LLIST with the following numbering
+scheme:
+
+ -----------------------
+ code particle mass
+ -----------------------
+ 1 gam 0.0000
+ 2 e+ 0.0005
+ 3 e- 0.0005
+ 4 mu+ 0.1057
+ 5 mu- 0.1057
+ 6 pi0 0.1350
+ 7 pi+ 0.1396
+ 8 pi- 0.1396
+ 9 k+ 0.4937
+ 10 k- 0.4937
+ 11 k0l 0.4977
+ 12 k0s 0.4977
+ 13 p 0.9383
+ 14 n 0.9396
+ 15 nue 0.0000
+ 16 nueb 0.0000
+ 17 num 0.0000
+ 18 numb 0.0000
+ 21 k0 0.4977
+ 22 k0b 0.4977
+ 23 eta 0.5488
+ 24 etap 0.9576
+ 25 rho+ 0.7714
+ 26 rho- 0.7714
+ 27 rho0 0.7717
+ 28 k*+ 0.8921
+ 29 k*- 0.8921
+ 30 k*0 0.8965
+ 31 k*0b 0.8965
+ 32 omeg 0.7826
+ 33 phi 1.1020
+ 34 SIG+ 1.1894
+ 35 SIG0 1.1925
+ 36 SIG- 1.1973
+ 37 XI0 1.3149
+ 38 XI- 1.3213
+ 39 LAM 1.1156
+ 40 DELT++ 1.2300
+ 41 DELT+ 1.2310
+ 42 DELT0 1.2320
+ 43 DELT- 1.2330
+ 44 SIG*+ 1.3828
+ 45 SIG*0 1.3837
+ 46 SIG*- 1.3872
+ 47 XI*0 1.5318
+ 48 XI*- 1.5350
+ 49 OME*- 1.6724
+
+Antibaryons have negative ID numbers correspondingly.
+Decayed particles are marked by adding 10000 to their ID code.
+
+The decay of a particle with code ID can be turned off via
+
+ IDB(ID) = -ABS(IDB(ID))
+
+and turned on via
+
+ IDB(ID) = ABS(IDB(ID))
+
+This has to be done only once at the beginning of event generation or
+might be changed on an event-by-event basis.
+
+
+
+The particles produced in the last EVENTGEN call can be listed
+conveniently by
+ CALL print_event(1)
+
+
+
+
+Related publications:
+--------------------
+
+- M"ucke A., et al. 1999, astro-ph/9903478, to appear in Comp.Phys.Commun.
+
+- M"ucke A., et al. 1999, astro-ph/9808279, to appear in PASA.
+
+- M"ucke A., et al. 1999, to appear in: Proc. of the
+ 19th Texas Symposium on Relativistic Astrophysics, Paris,
+ France, Dec. 1998. Eds.: J.~Paul, T.~Montmerle \& E.~Aubourg
+ (CEA Saclay)
+
+- M"ucke A., et al. 1999, astro-ph/9905153, to appear in: Proc. of
+ 19th Texas Symposium on Relativistic Astrophysics, Paris, France,
+ Dec. 1998. Eds.: J.~Paul, T.~Montmerle \& E.~Aubourg
+ (CEA Saclay)
+
+- M"ucke A., et al 1999, to appear in: Proc. of 26th Int.Cosmic
+ Ray Conf. (Salt Lake City, Utah)
diff --git a/modules/sophia/SOPHIA20.f b/modules/sophia/SOPHIA20.f
new file mode 100644
index 0000000000000000000000000000000000000000..04d9e85071b512b50eaa8bc941fc7c6c9e057c2d
--- /dev/null
+++ b/modules/sophia/SOPHIA20.f
@@ -0,0 +1,322 @@
+c*****************************************************************************
+c**!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!***
+c**!! IF YOU USE THIS PROGRAM, PLEASE CITE: !!***
+c**!! A.M"ucke, Ralph Engel, J.P.Rachen, R.J.Protheroe and Todor Stanev, !!***
+c**!! 1999, astro-ph/9903478, to appear in Comp.Phys.Commun. !!***
+c**!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!***
+c*****************************************************************************
+c** Further SOPHIA related papers: ***
+c** (1) M"ucke A., et al 1999, astro-ph/9808279, to appear in PASA. ***
+c** (2) M"ucke A., et al 1999, to appear in: Proc. of the ***
+c** 19th Texas Symposium on Relativistic Astrophysics, Paris, France, ***
+c** Dec. 1998. Eds.: J.~Paul, T.~Montmerle \& E.~Aubourg (CEA Saclay) ***
+c** (3) M"ucke A., et al 1999, astro-ph/9905153, to appear in: Proc. of ***
+c** 19th Texas Symposium on Relativistic Astrophysics, Paris, France, ***
+c** Dec. 1998. Eds.: J.~Paul, T.~Montmerle \& E.~Aubourg (CEA Saclay) ***
+c** (4) M"ucke A., et al 1999, to appear in: Proc. of 26th Int.Cosmic Ray ***
+c** Conf. (Salt Lake City, Utah) ***
+c*****************************************************************************
+
+
+
+ program SOPHIA20
+
+c************************************************************************
+c*** Simulation Of PhotoHadronic Interactions in Astrophysics ***********
+c*** VERSION 2.0 ***********
+c************************************************************************
+
+c************************************************************************
+c** Main program for photopion production of relativistic nucleons **
+c** in a radiation field (blackbody or power law) **
+c************************************************************************
+c** Date: 20/01/98 **
+c** correct.:19/02/98 **
+c** first release to **
+c** collab.: 25/05/98 **
+c** Version 1.3: 31/08/98 **
+c** Version 1.4: 12/10/98 **
+c** change to DP: 16/11/98 **
+c** last corr.: 07/99 **
+c** authors: A.G.F. Muecke **
+c** R.R. Engel **
+c** in collaboration with **
+c** R.J. Protheroe **
+c** J.P. Rachen **
+c** T.S. Stanev **
+c*****************************
+
+c****** INPUT ***********************************************************************
+c E0 = energy of incident proton (in lab frame) [in GeV]
+c L0 = code number of the incident nucleon (L0=13: proton, L0=14: neutron)
+c soft photon field: for thermal spectrum: temperature tbb [in K]
+c for PL: (set tbb = 0) alpha = PL index (S \sim nu^{-alpha}),
+c epsmin = low energy cut off [in eV]
+c epsmax = high energy cut off [in eV]
+c****** OUTPUT **********************************************************************
+c** energy distribution P(x) (logarithmic scale, x=E_particle/E0) for ***
+c** photons, protons, neutrons, e-neutrinos, nu-neutrinos ***
+c************************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+
+ COMMON/input/ tbb,E0,alpha1,alpha2,
+ & epsm1,epsm2,epsb,L0
+ COMMON /S_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+ COMMON /S_MASS1/ AM(49), AM2(49)
+ COMMON /S_CHP/ S_LIFE(49), ICHP(49), ISTR(49), IBAR(49)
+ COMMON /S_CSYDEC/ CBR(102), IDB(49), KDEC(612), LBARP(49)
+
+ CHARACTER*6 NAMPRES
+ COMMON /RES_PROP/ AMRES(9), SIG0(9),WIDTH(9),
+ + NAMPRES(0:9)
+
+ CHARACTER*6 NAMPRESp
+ COMMON /RES_PROPp/ AMRESp(9), BGAMMAp(9),WIDTHp(9),
+ + RATIOJp(9),NAMPRESp(0:9)
+
+ CHARACTER*6 NAMPRESn
+ COMMON /RES_PROPn/ AMRESn(9), BGAMMAn(9),WIDTHn(9),
+ + RATIOJn(9),NAMPRESn(0:9)
+
+
+ DIMENSION DNg(201),DNnum(201),DNnue(201),DNp(201),DNn(201)
+ DIMENSION DNnuma(201),DNnuea(201),E0_arr(101)
+ DIMENSION Dg(101,201),Dnum(101,201),Dnue(101,201)
+ DIMENSION Dp(101,201),Dn(101,201),Dnuma(101,201),Dnuea(101,201)
+ DIMENSION Dem(101,201),Dep(101,201),DNem(201),DNep(201)
+
+ dimension c_feps(10000),eps_arr(10000)
+
+ character*6 nameinc
+ character*1 ans
+
+ external sample_eps,sample_s,eventgen,
+ & listdistr,output,initial,prob_epskt
+
+ DATA pi /3.141593D0/
+
+ do i=1,201
+ DNg(i) = 0.D0
+ DNnum(i) = 0.D0
+ DNnue(i) = 0.D0
+ DNp(i) = 0.D0
+ DNn(i) = 0.D0
+ DNem(i) = 0.D0
+ DNep(i) = 0.D0
+ DNnuma(i) = 0.D0
+ DNnuea(i) = 0.D0
+
+ do jm=1,101
+ Dg(jm,i) = 0.D0
+ Dnum(jm,i) = 0.D0
+ Dnue(jm,i) = 0.D0
+ Dp(jm,i) = 0.D0
+ Dn(jm,i) = 0.D0
+ Dem(jm,i) = 0.D0
+ Dep(jm,i) = 0.D0
+ Dnuma(jm,i) = 0.D0
+ Dnuea(jm,i) = 0.D0
+ enddo
+
+ enddo
+
+
+c****** INPUT **************************************************
+ print*
+ print*,'Give in code number of incident nucleon: '
+ print*,' (13 = proton, 14 = neutron)'
+ read(*,*) L0
+
+ delE = 0.D0
+ print*
+ print*,'Incident nucleon spectrum:'
+ print*,'energy grid [s] or single nucleon [n] ? '
+ read(*,'(A1)') ans
+
+ if (ans.eq.'n') then
+ jm = 1
+ ninc = 1
+ 4 print*,'Give energy [in GeV] of incident nucleon: '
+ read(*,*) E0
+
+ if (E0.lt.AM(L0)) then
+ print*,'No valid input !'
+ goto 4
+ endif
+ Emin = log10(E0)
+ Emax = Emin
+ endif
+ if (ans.eq.'s') then
+ 5 print*,'Give in low-energy cut off (in GeV) of nucleon
+ & energy grid:'
+ read(*,*) Emin
+
+ if (Emin.lt.AM(L0)) then
+ print*,'No valid input !'
+ goto 5
+ endif
+ Emin = log10(Emin)
+ print*,'Give in high-energy cut off (in GeV) of nucleon
+ & energy grid:'
+ read(*,*) Emax
+
+ if (Emax.lt.Emin) then
+ print*,'No valid input !'
+ goto 5
+ endif
+ Emax = log10(Emax)
+ print*,'Give number of bins (< 101):'
+ read(*,*) ninc
+ delE = (Emax-Emin)/ninc
+ ninc = ninc+1
+ endif
+
+ print*
+ 2 print*,'Give soft photon spectrum: '
+ print*,' blackbody spectrum ? (y/n): '
+ read(*,'(A1)') ans
+
+ if (ans.eq.'y') then
+ rad_den = 1.D0
+ print*,'Give temperature [in K]: '
+ read(*,*) tbb
+
+ else if (ans.eq.'n') then
+ tbb = 0.D0
+ print*,' for power law spectrum n(eps) ~ eps^-alpha:'
+ print*,' (alpha = 0 ... 3)'
+ 8 print*,'straight power law ? (y/n): '
+
+ read(*,'(A1)') ans
+ if (ans.eq.'y') then
+ 3 print*,' spectral index alpha = '
+ read(*,*) alpha2
+
+ if (alpha2.lt.0.D0.or.alpha2.gt.3.D0) then
+ print*,'no valid input !'
+ goto 3
+ endif
+ alpha1 = alpha2
+ else if (ans.eq.'n') then
+ print*,'broken power law:'
+ print*,' spectral index alpha1, alpha2 = '
+ read(*,*) alpha1,alpha2
+ if (alpha1.lt.0.D0.or.alpha1.gt.3.D0.or.
+ & alpha2.lt.0.D0.or.alpha2.gt.3.D0) then
+ print*,'no valid input !'
+ goto 8
+ endif
+ print*,'break energy [eV] = '
+ read(*,*) epsb
+ else
+ print*,'no valid input !'
+ goto 8
+ endif
+ print*,'low-energy cut off [eV] = '
+ read(*,*) epsmin
+ print*,'high-energy cut off [eV] = '
+ read(*,*) epsmax
+
+ if (ans.eq.'y') epsb = epsmin/100.D0
+ else
+ print*,'no valid input !'
+ goto 2
+ endif
+
+ print*
+ print*,'Give number of trials: '
+ read(*,*) ntrial
+
+ print*
+ print*,
+ &'Give number of bins (<201) for output particle spectra: '
+ print*,
+ &'(spectra in logarithmic equal bins, with stepsize Delta x'
+ print*,' with x=E_particle/E_initial nucleon )'
+ read(*,*) nbins
+
+ print*
+ print*,
+ &'Give stepsize Delta x for output particle spectra: '
+ read(*,*) delx
+
+ print*
+ print*,'Give filename (< 7 CH) for output: '
+ read(*,'(A6)') nameinc
+ print*
+
+ call initial(L0)
+
+c... nucleon energy loop:
+ do jm=1,ninc
+ Elog = Emin+(jm-1)*delE
+ E0 = 10.D0**Elog
+ E0_arr(jm) = E0
+
+c... trial loop:
+ do nt=1,ntrial
+
+c*******************************************************
+c sample epsilon = energy of photon in lab frame
+c*******************************************************
+ pm = AM(L0)
+ 6 call sample_eps(epseV,epsmin,epsmax)
+ if (epseV.le.0.) goto 7
+c *** eps in GeV:
+ eps = epseV/1.D9
+ Etot = E0+eps
+
+c*******************************************************
+c sample s = total mass of center of momentum frame
+c*******************************************************
+ 18 call sample_s(s,eps)
+ gammap = E0/pm
+ betap = sqrt(1.D0-1.D0/gammap/gammap)
+ theta = ((pm*pm-s)/2.D0/E0/eps+1.D0)/betap
+ if (abs(theta).gt.1.D0) STOP
+ theta = acos(theta)*180.D0/pi
+
+c***********************************************************
+c*** CALL PHOTOPION EVENT GENERATOR
+c***********************************************************
+
+ call eventgen(L0,E0,eps,theta,Imode)
+
+c*********************************************************
+c store decayed particles and their energy distribution: *
+c*********************************************************
+c... calculate particle distribution dN/dlog(f) with f=E/E0:
+c [note: E*dN/dE = dN/dlog(f)]
+
+ call listdistr(E0,DNg,DNnum,DNnuma,DNnue,DNnuea,
+ & DNp,DNn,DNem,DNep,nbins,delx)
+
+ xini = -nbins*delx
+ do 55 i=1,nbins
+ Dg(jm,i) = Dg(jm,i)+DNg(i)/delx/ntrial
+ Dnum(jm,i) = Dnum(jm,i)+DNnum(i)/delx/ntrial
+ Dnue(jm,i) = Dnue(jm,i)+DNnue(i)/delx/ntrial
+ Dnuma(jm,i) = Dnuma(jm,i)+DNnuma(i)/delx/ntrial
+ Dnuea(jm,i) = Dnuea(jm,i)+DNnuea(i)/delx/ntrial
+ Dp(jm,i) = Dp(jm,i)+DNp(i)/delx/ntrial
+ Dn(jm,i) = Dn(jm,i)+DNn(i)/delx/ntrial
+ Dem(jm,i) = Dem(jm,i)+DNem(i)/delx/ntrial
+ Dep(jm,i) = Dep(jm,i)+DNep(i)/delx/ntrial
+ 55 continue
+
+c... trial loop:
+ enddo
+ 7 continue
+
+c... nucleon energy loop:
+ enddo
+
+ call output(Dg,Dnum,Dnuma,Dnue,Dnuea,Dp,Dn,Dem,Dep,
+ & nbins,ninc,nameinc,delx,Emin,Emax,E0_arr,epsmin,epsmax)
+
+ STOP
+
+
+ END
diff --git a/modules/sophia/eventgen.f b/modules/sophia/eventgen.f
new file mode 100644
index 0000000000000000000000000000000000000000..d9e31d561054e5bac7df64ee5c58ebac7c530335
--- /dev/null
+++ b/modules/sophia/eventgen.f
@@ -0,0 +1,3324 @@
+c*****************************************************************************
+c**!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!***
+c**!! IF YOU USE THIS PROGRAM, PLEASE CITE: !!***
+c**!! A.M"ucke, Ralph Engel, J.P.Rachen, R.J.Protheroe and Todor Stanev, !!***
+c**!! 1999, astro-ph/9903478, to appear in Comp.Phys.Commun. !!***
+c**!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!***
+c*****************************************************************************
+c** Further SOPHIA related papers: ***
+c** (1) M"ucke A., et al 1999, astro-ph/9808279, to appear in PASA. ***
+c** (2) M"ucke A., et al 1999, to appear in: Proc. of the ***
+c** 19th Texas Symposium on Relativistic Astrophysics, Paris, France, ***
+c** Dec. 1998. Eds.: J.~Paul, T.~Montmerle \& E.~Aubourg (CEA Saclay) ***
+c** (3) M"ucke A., et al 1999, astro-ph/9905153, to appear in: Proc. of ***
+c** 19th Texas Symposium on Relativistic Astrophysics, Paris, France, ***
+c** Dec. 1998. Eds.: J.~Paul, T.~Montmerle \& E.~Aubourg (CEA Saclay) ***
+c** (4) M"ucke A., et al 1999, to appear in: Proc. of 26th Int.Cosmic Ray ***
+c** Conf. (Salt Lake City, Utah) ***
+c*****************************************************************************
+
+
+ subroutine eventgen(L0,E0,eps,theta,Imode)
+
+c*******************************************************
+c** subroutine for photopion production of **
+c** relativistic nucleons in a soft photon field **
+c** subroutine for SOPHIA Version 1.2 **
+c****** INPUT ******************************************
+c E0 = energy of incident proton (in lab frame) [in GeV]
+c eps = energy of incident photon [in GeV] (in lab frame)
+c theta = angle between incident proton and photon [in degrees]
+c L0 = code number of the incident nucleon
+c****** OUTPUT *************************************************
+c P(2000,5) = 5-momentum of produced particles
+c LLIST(2000) = code numbers of produced particles
+c NP = number of produced particles
+c***************************************************************
+c** Date: 20/01/98 **
+c** correct.:19/02/98 **
+c** change: 23/05/98 **
+c** last change:06/09/98 **
+c** authors: A.Muecke **
+c** R.Engel **
+c**************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ SAVE
+
+ COMMON /SO_RUN/ SQS, S, Q2MIN, XMIN, ZMIN, kb, kt, a1, a2, Nproc
+ COMMON /SO_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+ COMMON /SO_MASS1/ AM(49), AM2(49)
+ COMMON /SO_CHP/ S_LIFE(49), ICHP(49), ISTR(49), IBAR(49)
+ COMMON /SO_CSYDEC/ CBR(102), IDB(49), KDEC(612), LBARP(49)
+
+ CHARACTER NAMPRES*6
+ COMMON /RES_PROP/ AMRES(9), SIG0(9),WIDTH(9),
+ + NAMPRES(0:9)
+
+ CHARACTER NAMPRESp*6
+ COMMON /RES_PROPp/ AMRESp(9), BGAMMAp(9),WIDTHp(9),
+ + RATIOJp(9),NAMPRESp(0:9)
+
+ CHARACTER NAMPRESn*6
+ COMMON /RES_PROPn/ AMRESn(9), BGAMMAn(9),WIDTHn(9),
+ + RATIOJn(9),NAMPRESn(0:9)
+
+ INTEGER KSEQ
+ PARAMETER (KSEQ = 8)
+ DOUBLE PRECISION C(KSEQ),U(97,KSEQ),UNI
+ INTEGER IJKL(KSEQ),I97(KSEQ),J97(KSEQ),
+ * NTOT(KSEQ),NTOT2(KSEQ),JSEQ
+ COMMON /CRRANMA4/C,U,IJKL,I97,J97,NTOT,NTOT2,JSEQ
+
+ DOUBLE PRECISION P_nuc(4),P_gam(4),P_sum(4),PC(4),GamBet(4)
+
+
+
+ DATA pi /3.141593D0/
+ DATA IRESMAX /9/
+ DATA Icount / 0 /
+
+c****** INPUT **************************************************
+c E0 = energy of incident proton (in lab frame) [in GeV]
+c eps = energy of incident photon [in GeV] (in lab frame)
+c theta = angle between incident proton and photon [in degrees]
+c L0 = code number of the incident nucleon
+c***************************************************************
+c** calculate eps_prime = photon energy in nuclear rest frame,
+c** sqrt(s) = CMF energy of the N\gamma-system
+
+c... declare stable particles:
+
+C muons stable
+c IDB(4) = -ABS(IDB(4))
+c IDB(5) = -ABS(IDB(5))
+C
+C pi+,pi0,pi- stable
+c IDB(6) = -ABS(IDB(6))
+c IDB(7) = -ABS(IDB(7))
+c IDB(8) = -ABS(IDB(8))
+C
+C Deltas stable
+C IDB(40) = -ABS(IDB(40))
+C IDB(41) = -ABS(IDB(41))
+C IDB(42) = -ABS(IDB(42))
+C IDB(43) = -ABS(IDB(43))
+C rho, omega, phi stable
+C IDB(25) = -ABS(IDB(25))
+C IDB(26) = -ABS(IDB(26))
+C IDB(27) = -ABS(IDB(27))
+C IDB(32) = -ABS(IDB(32))
+C IDB(33) = -ABS(IDB(33))
+C print *,' WARNING: Deltas, eta, VMs are stable in this version'
+
+C rho0,omega stable
+c IDB(27) = -ABS(IDB(27))
+c IDB(32) = -ABS(IDB(32))
+
+C STRANGE PARTICLES:
+C kaons stable
+c IDB(9) = -ABS(IDB(9))
+c IDB(10) = -ABS(IDB(10))
+
+C IDB(11) = -ABS(IDB(11))
+C IDB(12) = -ABS(IDB(12))
+C IDB(21) = -ABS(IDB(21))
+C IDB(22) = -ABS(IDB(22))
+C kaons* stable
+c IDB(28) = -ABS(IDB(28))
+c IDB(29) = -ABS(IDB(29))
+c IDB(30) = -ABS(IDB(30))
+c IDB(31) = -ABS(IDB(31))
+
+C eta stable
+C IDB(23) = -ABS(IDB(23))
+
+C**anfe 2016/01/20 Initialize the non-default RMMARD
+C** random number generator with default
+C** seed, if necessary
+ if (.not.(U(1,1).gt.0D0)) Call INIT_RMMARD(12345)
+C incoming nucleon
+ pm = AM(L0)
+ P_nuc(1) = 0.D0
+ P_nuc(2) = 0.D0
+ P_nuc(3) = SQRT(MAX((E0-pm)*(E0+pm),0.D0))
+ P_nuc(4) = E0
+C incoming photon
+ P_gam(1) = EPS*SIN(theta*pi/180.D0)
+ P_gam(2) = 0.D0
+ P_gam(3) = -EPS*COS(theta*pi/180.D0)
+ P_gam(4) = EPS
+
+ Esum = P_nuc(4)+P_gam(4)
+ PXsum = P_nuc(1)+P_gam(1)
+ PYsum = P_nuc(2)+P_gam(2)
+ PZsum = P_nuc(3)+P_gam(3)
+ IQchr = ICHP(1)+ICHP(L0)
+ IQbar = IBAR(1)+IBAR(L0)
+
+ gammap = E0/pm
+ xx = 1.D0/gammap
+ if(gammap.gt.1000.D0) then
+ betap = 1.D0 - 0.5D0*xx**2 - 0.125D0*xx**4
+ else
+ betap = sqrt(1.D0-xx)*sqrt(1.D0+xx)
+ endif
+c Etot = E0+eps
+ s = pm*pm + 2.D0*eps*E0*(1.D0-betap*cos(theta*pi/180.D0))
+ sqsm = sqrt(s)
+ eps_prime = (s-pm*pm)/2.D0/pm
+
+C calculate Lorentz boots and rotation
+ P_sum(1) = P_nuc(1)+P_gam(1)
+ P_sum(2) = P_nuc(2)+P_gam(2)
+ P_sum(3) = P_nuc(3)+P_gam(3)
+ P_sum(4) = P_nuc(4)+P_gam(4)
+C Lorentz transformation into c.m. system
+ DO I=1,4
+ GamBet(I) = P_sum(I)/sqsm
+ ENDDO
+C calculate rotation angles
+ IF(GamBet(4).lt.1.d5) then
+C transform nucleon vector
+ GamBet(1) = -GamBet(1)
+ GamBet(2) = -GamBet(2)
+ GamBet(3) = -GamBet(3)
+ CALL PO_ALTRA(GamBet(4),GamBet(1),GamBet(2),GamBet(3),
+ & P_nuc(1),P_nuc(2),P_nuc(3),P_nuc(4),Ptot,
+ & PC(1),PC(2),PC(3),PC(4))
+ GamBet(1) = -GamBet(1)
+ GamBet(2) = -GamBet(2)
+ GamBet(3) = -GamBet(3)
+C rotation angle: nucleon moves along +z
+ COD = PC(3)/Ptot
+ SID = SQRT(PC(1)**2+PC(2)**2)/Ptot
+ COF = 1.D0
+ SIF = 0.D0
+ IF(Ptot*SID.GT.1.D-5) THEN
+ COF=PC(1)/(SID*Ptot)
+ SIF=PC(2)/(SID*Ptot)
+ Anorf=SQRT(COF*COF+SIF*SIF)
+ COF=COF/Anorf
+ SIF=SIF/Anorf
+ ENDIF
+ else
+ COD = 1.D0
+ SID = 0.D0
+ COF = 1.D0
+ SIF = 0.D0
+ endif
+
+c... check for threshold:
+ sth = 1.1646D0
+ if (s.lt.sth) then
+ print*,'input energy below threshold for photopion production !'
+ print*,'sqrt(s) = ',sqrt(s)
+ NP = 0
+ RETURN
+ endif
+
+ 200 continue
+ Icount = Icount+1
+ Imode = 0
+
+c*******************************************************************
+c decide which process occurs: ***
+c (1) decay of resonance ***
+c (2) direct pion production (interaction of photon with ***
+c virtual pions in nucleon cloud) and diffractive scattering ***
+c (3) multipion production ***
+c*******************************************************************
+
+ call dec_inter3(eps_prime,Imode,L0)
+
+c*********************************************
+c******* PARTICLE PRODUCTION *****************
+c*********************************************
+c 42 continue
+ if (Imode.le.5) then
+c... direct/multipion/diffractive scattering production channel:
+ call GAMMA_H(sqsm,L0,Imode,Ifbad)
+ if(Ifbad.ne.0) then
+ print *,' eventgen: simulation of particle production failed'
+ goto 200
+ endif
+ else if (Imode.eq.6) then
+c... Resonances:
+c... decide which resonance decays with ID=IRES in list:
+c... IRESMAX = number of considered resonances = 9 so far
+ IRES = 0
+ 46 call dec_res2(eps_prime,IRES,IRESMAX,L0)
+ Nproc = 10+IRES
+ call dec_proc2(eps_prime,IPROC,IRANGE,IRES,L0)
+c 2-particle decay of resonance in CM system:
+ NP = 2
+ call res_decay3(IRES,IPROC,IRANGE,s,L0,nbad)
+ if (nbad.eq.1) then
+ print *,' eventgen: event rejected by res_decay3'
+ goto 46
+ endif
+ call DECSOP
+ else
+ print*,'invalid Imode !!'
+ STOP
+ endif
+
+c... consider only stable particles:
+ 18 istable=0
+ do 16 i=1,NP
+ if (abs(LLIST(i)).lt.10000) then
+ istable = istable+1
+ LLIST(istable) = LLIST(i)
+ P(istable,1) = P(i,1)
+ P(istable,2) = P(i,2)
+ P(istable,3) = P(i,3)
+ P(istable,4) = P(i,4)
+ P(istable,5) = P(i,5)
+ endif
+ 16 continue
+ if (NP.gt.istable) then
+ do i=istable+1,NP
+ LLIST(i) = 0
+ P(i,1) = 0.
+ P(i,2) = 0.
+ P(i,3) = 0.
+ P(i,4) = 0.
+ P(i,5) = 0.
+ enddo
+ endif
+ NP = istable
+
+c***********************************************
+c transformation from CM-system to lab-system: *
+c***********************************************
+
+ DO I=1,NP
+ CALL PO_TRANS(P(I,1),P(I,2),P(I,3),COD,SID,COF,SIF,
+ & PC(1),PC(2),PC(3))
+ PC(4) = P(I,4)
+ CALL PO_ALTRA(GamBet(4),GamBet(1),GamBet(2),GamBet(3),
+ & PC(1),PC(2),PC(3),PC(4),Ptot,
+ & P(I,1),P(I,2),P(I,3),P(I,4))
+ ENDDO
+
+c call check_event(Icount,Esum,PXsum,PYsum,PZsum,IQchr,IQbar,Irej)
+c if(Irej.ne.0) then
+c print *,' eventgen: event rejected by check_event'
+c goto 200
+c endif
+
+ return
+
+ END
+
+
+c*****************************
+c*** List of SUBROUTINES *****
+C*****************************
+
+ DOUBLE PRECISION function crossection(x,NDIR,NL0)
+
+ IMPLICIT DOUBLE PRECISION (A-M,O-Z)
+ IMPLICIT INTEGER (N)
+
+ SAVE
+
+ CHARACTER NAMPRES*6
+ COMMON /RES_PROP/ AMRES(9), SIG0(9),WIDTH(9),
+ + NAMPRES(0:9)
+ COMMON /SO_MASS1/ AM(49), AM2(49)
+
+ DIMENSION sig_res(9)
+
+ external breitwigner, Ef, singleback, twoback
+
+ DATA sth /1.1646D0/
+
+c*****************************************************
+C calculates crossection of N-gamma-interaction
+C (see thesis of J.Rachen, p.45ff and corrections
+C report from 27/04/98, 5/05/98, 22/05/98 of J.Rachen)
+C*****************************************************
+c** Date: 20/01/98 **
+c** correct.:27/04/98**
+c** update: 23/05/98 **
+c** author: A.Muecke **
+c**********************
+c
+c x = eps_prime in GeV
+ pm = AM(NL0)
+ s = pm*pm+2.D0*pm*x
+
+ if (s.lt.sth) then
+ crossection = 0.
+ RETURN
+ endif
+ if (x.gt.10.D0) then
+c only multipion production:
+ cross_res = 0.D0
+ cross_dir = 0.D0
+ cross_dir1 = 0.D0
+ cross_dir2 = 0.D0
+ goto 10
+ endif
+
+c****************************
+c RESONANCES:
+c****************************
+
+ cross_res = 0.D0
+
+ cross_res = breitwigner(SIG0(1),WIDTH(1),AMRES(1),x)
+ & *Ef(x,0.152D0,0.17D0)
+ sig_res(1) = cross_res
+ DO N=2,9
+
+ sig_res(N) = breitwigner(SIG0(N),WIDTH(N),AMRES(N),x)
+ & *Ef(x,0.15D0,0.38D0)
+ cross_res = cross_res + sig_res(N)
+
+ ENDDO
+
+c****************************
+c DIRECT CHANNEL:
+c****************************
+
+ if((x.gt.0.1D0).and.(x.lt.0.6D0)) then
+ cross_dir1 = singleback(x)
+ & + 40.D0*exp(-(x-0.29D0)**2/0.002D0)
+ & - 15.D0*exp(-(x-0.37D0)**2/0.002D0)
+ else
+ cross_dir1 = singleback(x)
+ endif
+ cross_dir2 = twoback(x)
+
+ cross_dir = cross_dir1 + cross_dir2
+
+c****************************
+c FRAGMENTATION 2:
+c****************************
+ 10 continue
+ if (NL0.eq.13) then
+ cross_frag2 = 80.3D0*Ef(x,0.5D0,0.1D0)*(s**(-0.34D0))
+ else if (NL0.eq.14) then
+ cross_frag2 = 60.2D0*Ef(x,0.5D0,0.1D0)*(s**(-0.34D0))
+ endif
+
+c****************************************************
+c MULTIPION PRODUCTION/FRAGMENTATION 1 CROSS SECTION
+c****************************************************
+ if (x.gt.0.85D0) then
+ ss1 = (x-.85D0)/.69D0
+ if (NL0.eq.13) then
+ ss2 = 29.3D0*(s**(-.34D0))+59.3D0*(s**.095D0)
+ else if (NL0.eq.14) then
+ ss2 = 26.4D0*(s**(-.34D0))+59.3D0*(s**.095D0)
+ endif
+ cs_multidiff = (1.-exp(-ss1))*ss2
+ cs_multi = 0.89D0*cs_multidiff
+
+c****************************
+c DIFFRACTIVE SCATTERING:
+c****************************
+
+ cross_diffr1 = .099D0*cs_multidiff
+ cross_diffr2 = .011D0*cs_multidiff
+ cross_diffr = 0.11D0*cs_multidiff
+
+C***********************************************************************
+
+ ss1 = ((x-.85D0)**.75D0)/.64D0
+ ss2 = 74.1D0*(x**(-.44D0))+62.D0*(s**.08D0)
+ cs_tmp = 0.96D0*(1.D0-exp(-ss1))*ss2
+ cross_diffr1 = 0.14D0*cs_tmp
+ cross_diffr2 = 0.013D0*cs_tmp
+ cs_delta = cross_frag2 - (cross_diffr1+cross_diffr2-cross_diffr)
+ if(cs_delta.lt.0.D0) then
+ cross_frag2 = 0.D0
+ cs_multi = cs_multi+cs_delta
+ else
+ cross_frag2 = cs_delta
+ endif
+ cross_diffr = cross_diffr1 + cross_diffr2
+ cs_multidiff = cs_multi + cross_diffr
+
+C***********************************************************************
+
+
+ else
+ cross_diffr = 0.D0
+ cross_diffr1 = 0.D0
+ cross_diffr2 = 0.D0
+ cs_multidiff = 0.D0
+ cs_multi = 0.D0
+ endif
+
+ if (NDIR.eq.3) then
+
+ crossection = cross_res+cross_dir+cs_multidiff+cross_frag2
+ RETURN
+
+ else if (NDIR.eq.0) then
+
+ crossection = cross_res+cross_dir+cross_diffr+cross_frag2
+ RETURN
+
+ else if (NDIR.eq.2) then
+
+ crossection = cross_res+cross_dir
+ RETURN
+
+ else if (NDIR.eq.1) then
+
+ crossection = cross_res
+ RETURN
+
+ else if (NDIR.eq.4) then
+
+ crossection = cross_dir
+ RETURN
+
+ else if (NDIR.eq.5) then
+
+ crossection = cs_multi
+ RETURN
+
+ else if (NDIR.eq.6) then
+
+ crossection = cross_res+cross_dir2
+ RETURN
+
+ else if (NDIR.eq.7) then
+
+ crossection = cross_res+cross_dir1
+ RETURN
+
+ else if (NDIR.eq.8) then
+
+ crossection = cross_res+cross_dir+cross_diffr1
+ RETURN
+
+ else if (NDIR.eq.9) then
+
+ crossection = cross_res+cross_dir+cross_diffr
+ RETURN
+
+ else if (NDIR.eq.10) then
+
+ crossection = cross_diffr
+ RETURN
+
+ else if ((NDIR.ge.11).and.(NDIR.le.19)) then
+
+ crossection = sig_res(NDIR-10)
+ RETURN
+
+ else
+
+ print*,'wrong input NDIR in crossection.f !'
+ STOP
+
+ endif
+
+ END
+
+
+ DOUBLE PRECISION function breitwigner(sigma_0,Gamma,
+ & DMM,eps_prime)
+
+ IMPLICIT DOUBLE PRECISION (A-M,O-Z)
+ IMPLICIT INTEGER (N)
+
+ SAVE
+
+c***************************************************************************
+c calculates Breit-Wigner cross section of a resonance with width Gamma [GeV],
+c mass DMM [GeV], max. cross section sigma_0 [mubarn] and total mass of the
+c interaction s [GeV]
+c***************************************************************************
+ pm = 0.93827D0
+ s = pm*pm+2.D0*pm*eps_prime
+ gam2s = Gamma*Gamma*s
+ breitwigner = sigma_0
+ & *(s/eps_prime**2)*gam2s/((s-DMM*DMM)**2+gam2s)
+
+ RETURN
+
+ END
+
+
+ DOUBLE PRECISION function Pl(x,xth,xmax,alpha)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+ if (xth.gt.x) then
+ Pl = 0.
+ RETURN
+ endif
+
+ a = alpha*xmax/xth
+ prod1 = ((x-xth)/(xmax-xth))**(a-alpha)
+ prod2 = (x/xmax)**(-a)
+ Pl = prod1*prod2
+
+ END
+
+
+ DOUBLE PRECISION function Ef(x,th,w)
+
+ IMPLICIT DOUBLE PRECISION (A-M,O-Z)
+ IMPLICIT INTEGER (N)
+
+ SAVE
+
+ wth = w+th
+ if (x.le.th) then
+ Ef = 0.
+ RETURN
+ else if (x.gt.th.and.x.lt.wth) then
+ Ef = (x-th)/w
+ RETURN
+ else if (x.ge.wth) then
+ Ef = 1.
+ RETURN
+ else
+ print*,'error in function EF'
+ STOP
+ endif
+
+ END
+
+
+
+ subroutine dec_inter3(eps_prime,Imode,L0)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+
+ DOUBLE PRECISION RNDM
+ external RNDM
+
+c*** decides which process takes place at eps_prime ********
+c (6) excitation/decay of resonance ***
+c (2) direct pion production: N\gamma --> N \pi ***
+c (3) direct pion production: N\gamma --> \Delta \pi ***
+c (1) diffractive scattering: N\gamma --> N \rho ***
+c (4) diffractive scattering: N\gamma --> N \omega ***
+c (0) multipion production (fragmentation) ***
+c (5) fragmentation in resonance region ***
+c***********************************************************
+c** Date: 15/04/98 **
+c** author: A.Muecke **
+c**********************
+ tot = crossection(eps_prime,3,L0)
+ if (tot.eq.0.) tot = 1.D0
+ prob1 = crossection(eps_prime,1,L0)/tot
+ prob2 = crossection(eps_prime,7,L0)/tot
+ prob3 = crossection(eps_prime,2,L0)/tot
+ prob4 = crossection(eps_prime,8,L0)/tot
+ prob5 = crossection(eps_prime,9,L0)/tot
+ prob6 = crossection(eps_prime,0,L0)/tot
+ prob7 = 1.D0
+ rn = RNDM(0)
+
+ if (rn.lt.prob1) then
+ Imode = 6
+c ... --> resonance decay
+ RETURN
+ else if (prob1.le.rn.and.rn.lt.prob2) then
+ Imode = 2
+c ... --> direct channel: N\gamma --> N\pi
+ RETURN
+ else if (prob2.le.rn.and.rn.lt.prob3) then
+ Imode = 3
+c ... --> direct channel: N\gamma --> \Delta \pi
+ RETURN
+ else if (prob3.le.rn.and.rn.lt.prob4) then
+ Imode = 1
+c ... --> diffractive scattering: N\gamma --> N \rho
+ RETURN
+ else if (prob4.le.rn.and.rn.lt.prob5) then
+ Imode = 4
+c ... --> diffractive scattering: N\gamma --> N \omega
+ RETURN
+ else if (prob5.le.rn.and.rn.lt.prob6) then
+ Imode = 5
+c ... --> fragmentation (2) in resonance region
+ return
+ else if (prob6.le.rn.and.rn.lt.1.D0) then
+ Imode = 0
+c ... --> fragmentation mode/multipion production
+ RETURN
+ else if (rn.eq.1.D0) then
+ Imode = 0
+ RETURN
+ else
+ print*,'error in dec_inter.f !'
+ STOP
+ endif
+
+ END
+
+
+ SUBROUTINE PROC_TWOPART(LA,LB,AMD,Lres,Pres,costheta,nbad)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON /SO_MASS1/ AM(49), AM2(49)
+ COMMON /RES_FLAG/ FRES(49),XLIMRES(49)
+ SAVE
+ DIMENSION Pres(2000,5),Lres(2000)
+
+c***********************************************************
+c 2-particle decay of CMF mass AMD INTO M1 + M2
+C NUCLEON ENERGY E0 [in GeV];
+C E1,E2 [in GeV] are energies of decay products
+c LA,LB are code numbers of decay products
+c P1(1:5),P2(1:5) are 5-momenta of particles LA,LB;
+c resulting momenta are calculated in CM frame;
+c costheta is cos of scattering angle in CM frame
+c this program also checks if the resulting particles are
+c resonances; if yes, it is also allowed to decay a
+c mass AMD < M1 + M2 by using the width of the resonance(s)
+c***********************************************************
+c** Date: 20/01/98 **
+c** correct.:19/02/98**
+c** author: A.Muecke **
+c**********************
+
+ nbad = 0
+ SM1 = AM(LA)
+ if (LB.eq.0) then
+ SM2 = 2.D0*AM(7)
+ else
+ SM2 = AM(LB)
+ endif
+ E1 = (AMD*AMD + SM1*SM1 - SM2*SM2)/AMD/2.D0
+ E2 = (AMD*AMD + SM2*SM2 - SM1*SM1)/AMD/2.D0
+c... check if SM1+SM2 < AMD:
+ if ((SM1+SM2).gt.AMD) then
+c... if one of the decay products is a resonance, this 'problem' can
+c be solved by using a reduced mass for the resonance and assume that
+c this resonance is produced at its threshold;
+ if (FRES(LA).eq.1.D0) then
+c ... particle LA is a resonance:
+ SM1 = AMD-SM2
+ E1 = SM1
+ E2 = AMD-E1
+ if (E1.lt.XLIMRES(LA).or.E2.lt.XLIMRES(LB)) nbad = 1
+ endif
+ if (FRES(LB).eq.1.D0) then
+c ... particle LB is a resonance:
+ SM2 = AMD-SM1
+ E2 = SM2
+ E1 = AMD-E2
+ if (E1.lt.XLIMRES(LA).or.E2.lt.XLIMRES(LB)) nbad = 1
+ endif
+c ... both particles are NOT resonances: -> error !
+ if (FRES(LA).eq.0.D0.and.FRES(LB).eq.0.D0) then
+ print*,'SM1 + SM2 > AMD in PROC_TWOPART',SM1,SM2,AMD,LA,LB
+ STOP
+ endif
+ endif
+
+ if (nbad.eq.0) then
+ PC = SQRT((E1*E1 - SM1*SM1))
+ Pres(1,4) = E1
+ Pres(2,4) = E2
+ Pres(1,5) = SM1
+ Pres(2,5) = SM2
+
+
+C *********************************************************
+c theta is scattering angle in CM frame:
+ r = RNDM(0)
+ P1Z= PC*costheta
+ P2Z=-PC*costheta
+
+ P1X = sqrt(r*(PC*PC-P1Z*P1Z))
+ P2X = sqrt(r*(PC*PC-P2Z*P2Z))
+ P1Y = sqrt((1.D0-r)*(PC*PC-P1Z*P1Z))
+ P2Y = sqrt((1.D0-r)*(PC*PC-P2Z*P2Z))
+ if(RNDM(0).lt.0.5D0) then
+ P1X = -P1X
+ else
+ P2X = -P2X
+ endif
+ if(RNDM(0).lt.0.5D0) then
+ P1Y = -P1Y
+ else
+ P2Y = -P2Y
+ endif
+
+ Pres(1,1) = P1X
+ Pres(1,2) = P1Y
+ Pres(1,3) = P1Z
+ Pres(2,1) = P2X
+ Pres(2,2) = P2Y
+ Pres(2,3) = P2Z
+ Lres(1) = LA
+ Lres(2) = LB
+ endif
+
+ RETURN
+
+ END
+
+
+ subroutine dec_res2(eps_prime,IRES,IRESMAX,L0)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+c*****************************************************************************
+c*** decides which resonance with ID=IRES in list takes place at eps_prime ***
+c*****************************************************************************
+c** Date: 20/01/98 **
+c** author: A.Muecke **
+c**********************
+
+ DIMENSION prob_sum(9)
+
+
+c*** sum of all resonances:
+ sumres = 0.D0
+ do 12 j=1,IRESMAX
+ j10 = j+10
+ sumres = sumres+crossection(eps_prime,j10,L0)
+ prob_sum(j) = sumres
+ 12 continue
+
+
+ r = RNDM(0)
+
+ IRES = 0
+ i = 0
+ prob = 0.D0
+ 10 continue
+ i = i+1
+ probold = prob
+ prob = prob_sum(i)/sumres
+ if (r.ge.probold.and.r.lt.prob) then
+ IRES = i
+ RETURN
+ endif
+ if (i.lt.IRESMAX) goto 10
+ if (r.eq.1.D0) IRES = i
+ if (IRES.eq.0) then
+ print*,'no resonance possible !'
+ STOP
+ endif
+
+ RETURN
+
+ END
+
+
+ subroutine dec_proc2(x,IPROC,IRANGE,IRES,L0)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+c**********************************************************************
+c*** decide which decay with ID=IPROC of resonance IRES takes place ***
+c**********************************************************************
+c** Date: 20/01/98 **
+c** correct.: 27/04/98*
+c** author: A.Muecke **
+c**********************
+
+ COMMON /SO_RESp/ CBRRES1p(18),CBRRES2p(36),CBRRES3p(26),
+ + RESLIMp(36),ELIMITSp(9),KDECRES1p(90),KDECRES2p(180),
+ + KDECRES3p(130),IDBRES1p(9),IDBRES2p(9),IDBRES3p(9)
+ COMMON /SO_RESn/ CBRRES1n(18),CBRRES2n(36),CBRRES3n(22),
+ + RESLIMn(36),ELIMITSn(9),KDECRES1n(90),KDECRES2n(180),
+ + KDECRES3n(110),IDBRES1n(9),IDBRES2n(9),IDBRES3n(9)
+ DIMENSION prob_sum(0:9)
+
+c x = eps_prime
+c ... choose arrays /SO_RESp/ for charged resonances,
+c ... arrays /SO_RESn/ for neutral resonances
+ if (L0.eq.13) then
+c ... charged resonances:
+
+ r = RNDM(0)
+c... determine the energy range of the resonance:
+ nlim = ELIMITSp(IRES)
+ istart = (IRES-1)*4+1
+ if (nlim.gt.0) then
+ do ie=istart,nlim-2+istart
+ reslimp1 = RESLIMp(ie)
+ reslimp2 = RESLIMp(ie+1)
+ if (x.le.reslimp2.and.x.gt.reslimp1) then
+ IRANGE = ie+1-istart
+ endif
+ enddo
+ else
+ irange = 1
+ 13 endif
+
+
+
+ IPROC = -1
+ i = 0
+ prob_sum(0) = 0.D0
+
+ if (IRANGE.eq.1) then
+ j = IDBRES1p(IRES)-1
+ if (j.eq.-1) then
+ print*,'invalid resonance in energy range 1'
+ endif
+ 10 continue
+ j = j+1
+ i = i+1
+ prob_sum(i) = CBRRES1p(j)
+ if (r.ge.prob_sum(i-1).and.r.lt.prob_sum(i)) then
+ IPROC = j
+ endif
+ if (prob_sum(i).lt.1.D0) goto 10
+ if (r.eq.1.D0) IPROC = j
+ if (IPROC.eq.-1) then
+ print*,'no resonance decay possible !'
+ endif
+
+ else if (IRANGE.eq.2) then
+ j = IDBRES2p(IRES)-1
+ if (j.eq.-1) then
+ print*,'invalid resonance in energy range 2'
+ endif
+ 11 continue
+ j = j+1
+ i = i+1
+ prob_sum(i) = CBRRES2p(j)
+ if (r.ge.prob_sum(i-1).and.r.lt.prob_sum(i)) then
+ IPROC = j
+ endif
+ if (prob_sum(i).lt.1.D0) goto 11
+ if (r.eq.1.D0) IPROC = j
+ if (IPROC.eq.-1) then
+ print*,'no resonance decay possible !'
+ endif
+
+ else if (IRANGE.eq.3) then
+ j = IDBRES3p(IRES)-1
+ if (j.eq.-1) then
+ print*,'invalid resonance in energy range 3'
+ endif
+ 12 continue
+ j = j+1
+ i = i+1
+ prob_sum(i) = CBRRES3p(j)
+ if (r.ge.prob_sum(i-1).and.r.lt.prob_sum(i)) then
+ IPROC = j
+ endif
+ if (prob_sum(i).lt.1.D0) goto 12
+ if (r.eq.1.D0) IPROC = j
+ if (IPROC.eq.-1) then
+ print*,'no resonance decay possible !'
+ endif
+
+ else
+ print*,'invalid IRANGE in DEC_PROC2'
+ endif
+
+ RETURN
+
+
+ else if (L0.eq.14) then
+c ... neutral resonances:
+
+ r = RNDM(0)
+c... determine the energy range of the resonance:
+ nlim = ELIMITSn(IRES)
+ istart = (IRES-1)*4+1
+ if (nlim.gt.0) then
+ do ie=istart,nlim-2+istart
+ if (x.le.RESLIMn(ie+1).and.x.gt.RESLIMn(ie)) then
+ IRANGE = ie+1-istart
+ endif
+ enddo
+ else
+ irange = 1
+ endif
+
+
+ IPROC = -1
+ i = 0
+ prob_sum(0) = 0.D0
+
+ if (IRANGE.eq.1) then
+ j = IDBRES1n(IRES)-1
+ if (j.eq.-1) then
+ print*,'invalid resonance in this energy range'
+ endif
+ 20 continue
+ j = j+1
+ i = i+1
+ prob_sum(i) = CBRRES1n(j)
+ if (r.ge.prob_sum(i-1).and.r.lt.prob_sum(i)) then
+ IPROC = j
+ endif
+ if (prob_sum(i).lt.1.D0) goto 20
+ if (r.eq.1.D0) IPROC = j
+ if (IPROC.eq.-1) then
+ print*,'no resonance decay possible !'
+ endif
+
+ else if (IRANGE.eq.2) then
+ j = IDBRES2n(IRES)-1
+ if (j.eq.-1) then
+ print*,'invalid resonance in this energy range'
+ endif
+ 21 continue
+ j = j+1
+ i = i+1
+ prob_sum(i) = CBRRES2n(j)
+ if (r.ge.prob_sum(i-1).and.r.lt.prob_sum(i)) then
+ IPROC = j
+ endif
+ if (prob_sum(i).lt.1.D0) goto 21
+ if (r.eq.1.) IPROC = j
+ if (IPROC.eq.-1) then
+ print*,'no resonance decay possible !'
+ endif
+
+ else if (IRANGE.eq.3) then
+ j = IDBRES3n(IRES)-1
+ if (j.eq.-1) then
+ print*,'invalid resonance in this energy range'
+ endif
+ 22 continue
+ j = j+1
+ i = i+1
+ prob_sum(i) = CBRRES3n(j)
+ if (r.ge.prob_sum(i-1).and.r.lt.prob_sum(i)) then
+ IPROC = j
+ endif
+ if (prob_sum(i).lt.1.D0) goto 22
+ if (r.eq.1.D0) IPROC = j
+ if (IPROC.eq.-1) then
+ print*,'no resonance decay possible !'
+ endif
+
+ else
+ print*,'invalid IRANGE in DEC_PROC2'
+ endif
+
+ RETURN
+
+ else
+ print*,'no valid L0 in DEC_PROC !'
+ STOP
+ endif
+
+ END
+
+
+ SUBROUTINE RES_DECAY3(IRES,IPROC,IRANGE,s,L0,nbad)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+ COMMON /SO_RESp/ CBRRES1p(18),CBRRES2p(36),CBRRES3p(26),
+ + RESLIMp(36),ELIMITSp(9),KDECRES1p(90),KDECRES2p(180),
+ + KDECRES3p(130),IDBRES1p(9),IDBRES2p(9),IDBRES3p(9)
+ COMMON /SO_RESn/ CBRRES1n(18),CBRRES2n(36),CBRRES3n(22),
+ + RESLIMn(36),ELIMITSn(9),KDECRES1n(90),KDECRES2n(180),
+ + KDECRES3n(110),IDBRES1n(9),IDBRES2n(9),IDBRES3n(9)
+ COMMON /SO_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+c COMMON /SO_CNAM/ NAMP (0:49)
+c CHARACTER NAMP*6, NAMPRESp*6, NAMPRESn*6
+
+* external scatangle, proc_twopart
+
+c********************************************************
+c RESONANCE AMD with code number IRES INTO M1 + M2
+C PROTON ENERGY E0 [in GeV] IN DMM [in GeV]
+C E1,E2 [in GeV] are energies of decay products
+c LA,LB are code numbers of decay products
+c P(1,1:5),P(2,1:5) are 5-momenta of particles LA,LB;
+c resulting momenta are calculated in CM frame;
+c ANGLESCAT is cos of scattering angle in CM frame
+c********************************************************
+c** Date: 20/01/98 **
+c** correct.:28/04/98**
+c** author: A.Muecke **
+c**********************
+
+c... determine decay products LA, LB:
+ NP = 2
+ if (L0.eq.13) then
+c ... proton is incident nucleon:
+ if (IRANGE.eq.1) then
+ LA = KDECRES1p(5*(IPROC-1)+3)
+ LB = KDECRES1p(5*(IPROC-1)+4)
+ else if (IRANGE.eq.2) then
+ LA = KDECRES2p(5*(IPROC-1)+3)
+ LB = KDECRES2p(5*(IPROC-1)+4)
+ else if (IRANGE.eq.3) then
+ LA = KDECRES3p(5*(IPROC-1)+3)
+ LB = KDECRES3p(5*(IPROC-1)+4)
+ else
+ print*,'error in res_decay3'
+ endif
+ else if (L0.eq.14) then
+c ... neutron is incident nucleon:
+ if (IRANGE.eq.1) then
+ LA = KDECRES1n(5*(IPROC-1)+3)
+ LB = KDECRES1n(5*(IPROC-1)+4)
+ else if (IRANGE.eq.2) then
+ LA = KDECRES2n(5*(IPROC-1)+3)
+ LB = KDECRES2n(5*(IPROC-1)+4)
+ else if (IRANGE.eq.3) then
+ LA = KDECRES3n(5*(IPROC-1)+3)
+ LB = KDECRES3n(5*(IPROC-1)+4)
+ else
+ print*,'error in res_decay3'
+ endif
+
+ else
+ print*,'no valid L0 in RES_DECAY'
+ STOP
+ endif
+
+ LLIST(1) = LA
+ LLIST(2) = LB
+
+c... sample scattering angle:
+ call scatangle(anglescat,IRES,L0)
+
+c ... 2-particle decay:
+ call proc_twopart(LA,LB,sqrt(s),LLIST,P,anglescat,nbad)
+
+ RETURN
+
+ END
+
+c***********************************************************
+C calculates functions for crossection of direct channel
+c NOT isospin-corrected, simply a samelsurium of functions
+c x is eps_prime in GeV (see main program)
+C (see thesis of J.Rachen, p.45ff)
+c note: neglect strange- and eta-channel
+C***********************************************************
+c** Date: 27/04/98 **
+c** last chg:23/05/98**
+c** author: A.Muecke **
+c**********************
+c
+
+ DOUBLE PRECISION FUNCTION singleback(x)
+c****************************
+c SINGLE PION CHANNEL
+c****************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+ singleback = 92.7D0*Pl(x,.152D0,.25D0,2.D0)
+
+ END
+
+
+ DOUBLE PRECISION FUNCTION twoback(x)
+c*****************************
+c TWO PION PRODUCTION
+c*****************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+ twoback = 37.7D0*Pl(x,.4D0,.6D0,2.D0)
+
+ END
+
+
+ subroutine scatangle(anglescat,IRES,L0)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+c*******************************************************************
+c This routine samples the cos of the scattering angle for a given *
+c resonance IRES and incident nucleon L0; it is exact for **
+c one-pion decay channel and if there is no **
+c other contribution to the cross section from another resonance **
+c and an approximation for an overlay of resonances; **
+c for decay channels other than the one-pion decay a isotropic **
+c distribution is used **
+c*******************************************************************
+c** Date: 16/02/98 **
+c** author: A.Muecke **
+c**********************
+
+ COMMON /SO_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+
+c ... use rejection method for sampling:
+ LA = LLIST(1)
+ LB = LLIST(2)
+ 10 continue
+ r = RNDM(0)
+c*** sample anglescat random between -1 ... 1 **
+ anglescat = 2.D0*(r-0.5D0)
+c ... distribution is isotropic for other than one-pion decays:
+ if ((LA.eq.13.or.LA.eq.14).and.LB.ge.6.and.LB.le.8) then
+ prob = probangle(IRES,L0,anglescat)
+ else
+ prob = 0.5D0
+ endif
+ r = RNDM(0)
+ if (r.le.prob) then
+ RETURN
+ else
+ goto 10
+ endif
+ 12 continue
+
+ END
+
+ DOUBLE PRECISION function probangle(IRES,L0,z)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+c********************************************************************
+c probability distribution for scattering angle of given resonance **
+c IRES and incident nucleon L0 ; **
+c z is cosine of scattering angle in CMF frame **
+c********************************************************************
+
+ if (IRES.eq.4.or.IRES.eq.5.or.IRES.eq.2) then
+c ... N1535 andf N1650 decay isotropically.
+ probangle = 0.5D0
+ return
+ endif
+
+ if (IRES.eq.1) then
+c ... for D1232:
+ probangle = 0.636263D0 - 0.408790D0*z*z
+ return
+ endif
+
+ if (IRES.eq.3.and.L0.eq.14) then
+c ... for N1520 and incident n:
+ probangle = 0.673669D0 - 0.521007D0*z*z
+ return
+ endif
+
+ if (IRES.eq.3.and.L0.eq.13) then
+c ... for N1520 and incident p:
+ probangle = 0.739763D0 - 0.719288D0*z*z
+ return
+ endif
+
+ if (IRES.eq.6.and.L0.eq.14) then
+c ... for N1680 (more precisely: N1675) and incident n:
+ q=z*z
+ probangle = 0.254005D0 + 1.427918D0*q - 1.149888D0*q*q
+ return
+ endif
+
+
+ if (IRES.eq.6.and.L0.eq.13) then
+c ... for N1680 and incident p:
+ q=z*z
+ probangle = 0.189855D0 + 2.582610D0*q - 2.753625D0*q*q
+ return
+ endif
+
+ if (IRES.eq.7) then
+c ... for D1700:
+ probangle = 0.450238D0 + 0.149285D0*z*z
+ return
+ endif
+
+
+ if (IRES.eq.8) then
+c ... for D1905:
+ q=z*z
+ probangle = 0.230034D0 + 1.859396D0*q - 1.749161D0*q*q
+ return
+ endif
+
+
+ if (IRES.eq.9) then
+c ... for D1950:
+ q=z*z
+ probangle = 0.397430D0 - 1.498240D0*q + 5.880814D0*q*q
+ & - 4.019252D0*q*q*q
+ return
+ endif
+
+ print*,'error in function probangle !'
+ STOP
+ END
+
+C->
+ DOUBLE PRECISION FUNCTION GAUSS (FUN, A,B)
+c*********************************************************
+C Returns the 8 points Gauss-Legendre integral
+C of function FUN from A to B
+c this routine was provided by T.Stanev
+c*********************************************************
+c** Date: 20/01/98 **
+c** A.Muecke **
+c**********************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+
+ EXTERNAL FUN
+
+C...........................................................
+ DIMENSION X(8), W(8)
+ DATA X /.0950125098D0,.2816035507D0,.4580167776D0,.6178762444D0
+ + ,.7554044083D0,.8656312023D0,.9445750230D0,.9894009349D0/
+ DATA W /.1894506104D0,.1826034150D0,.1691565193D0,.1495959888D0
+ + ,.1246289712D0,.0951585116D0,.0622535239D0, .0271524594D0/
+
+ XM = 0.5D0*(B+A)
+ XR = 0.5D0*(B-A)
+ SS = 0.D0
+ DO NJ=1,8
+ DX = XR*X(NJ)
+ SS = SS + W(NJ) * (FUN(XM+DX) + FUN(XM-DX))
+ ENDDO
+ GAUSS = XR*SS
+ RETURN
+ END
+
+
+
+
+
+C->
+c***************************
+c** last change: 12/10/98 **
+c** author: A.Muecke **
+c***************************
+ BLOCK DATA DATDEC
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+ COMMON /SO_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+ COMMON /SO_CSYDEC/ CBR(102), IDB(49), KDEC(612), LBARP(49)
+ COMMON /SO_MASS1/ AM(49), AM2(49)
+ COMMON /SO_CHP/ S_LIFE(49), ICHP(49), ISTR(49), IBAR(49)
+ COMMON /SO_CNAM/ NAMP (0:49)
+
+ CHARACTER NAMPRESp*6
+ COMMON /RES_PROPp/ AMRESp(9), BGAMMAp(9),WIDTHp(9),
+ + RATIOJp(9),NAMPRESp(0:9)
+
+ CHARACTER NAMPRESn*6
+ COMMON /RES_PROPn/ AMRESn(9), BGAMMAn(9),WIDTHn(9),
+ + RATIOJn(9),NAMPRESn(0:9)
+
+ COMMON /SO_RESp/ CBRRES1p(18),CBRRES2p(36),CBRRES3p(26),
+ + RESLIMp(36),ELIMITSp(9),KDECRES1p(90),KDECRES2p(180),
+ + KDECRES3p(130),IDBRES1p(9),IDBRES2p(9),IDBRES3p(9)
+ COMMON /SO_RESn/ CBRRES1n(18),CBRRES2n(36),CBRRES3n(22),
+ + RESLIMn(36),ELIMITSn(9),KDECRES1n(90),KDECRES2n(180),
+ + KDECRES3n(110),IDBRES1n(9),IDBRES2n(9),IDBRES3n(9)
+ COMMON /RES_FLAG/ FRES(49),XLIMRES(49)
+ CHARACTER NAMP*6
+
+ DATA Ideb / 0 /
+
+ DATA FRES /0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ + 1,1,1,0,0,0,0,1,1,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,1/
+ DATA XLIMRES /0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.
+ + ,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,
+ + .275,.275,.28,0.,0.,0.,0.,.41,.9954,0.,0.,0.,0.,0.,0.,
+ + 1.078,1.08,1.078,1.08,0,0,0,0,0,1/
+ DATA AMRESp / 1.231,1.440,1.515,1.525,1.675,1.680,1.690,
+ + 1.895,1.950/
+ DATA AMRESn / 1.231,1.440,1.515,1.525,1.675,1.675,1.690,
+ + 1.895,1.950/
+ DATA IDBRES1p /
+ + 1,3,5,7,9,11,13,15,17/
+ DATA IDBRES2p /
+ + 0,1,6,11,14,19,24,27,32/
+ DATA IDBRES3p /
+ + 0,0,1,0,3,9,16,21,26/
+ DATA IDBRES1n /
+ + 1,3,5,7,9,11,13,15,17/
+ DATA IDBRES2n /
+ + 0,1,6,11,14,19,24,27,32/
+ DATA IDBRES3n /
+ + 0,0,1,0,3,0,9,14,19/
+
+ DATA CBRRES1p /
+ + .667,1.,.667,1.,.667,1.,.667,1.,.667,1.,.667,1.,.667,1.,
+ + .667,1.,.667,1./
+ DATA CBRRES1n /
+ + .667,1.,.667,1.,.667,1.,.667,1.,.667,1.,.667,1.,.667,1.,
+ + .667,1.,.667,1./
+C************************** settings of versions 1.4 - 2.0 *********
+ DATA CBRRES2p /
+ + .333,.5,.750,.917,1.,.333,.5,.75,.917,1.,.167,.25,1.,
+ + .567,.85,.925,.975,1.,.433,.65,.825,.942,1.,.4,.467,1.,
+ + .267,.4,.64,.68,1.,.4,.6,.76,.787,1./
+ DATA CBRRES2n /
+ + .333,.5,.750,.917,1.,.333,.5,.75,.917,1.,.167,.25,1.,
+ + .567,.85,.925,.975,1.,.267,.4,.7,.9,1.,.4,.467,1.,
+ + .267,.4,.64,.68,1.,.4,.6,.76,.787,1./
+ DATA CBRRES3p /
+ + .333,1.,.467,.7,.775,.825,.85,1.,.367,.55,.7,
+ + 1.,.08,.093,.2,.733,1.,.667,1.,
+ + .2,.3,.46,.487,.7,.9,1./
+ DATA CBRRES3n /
+ + .333,1.,.467,.7,.775,.825,.85,1.,
+ + .08,.093,.2,.733,1.,.667,1.,
+ + .2,.3,.46,.487,.7,.9,1./
+ DATA KDECRES1p /
+ + 2,0,13,6,0,2,0,14,7,0,2,0,14,7,0,2,0,13,6,0,2,0,14,7,0,
+ + 2,0,13,6,0,2,0,14,7,0,2,0,13,6,0,2,0,14,7,0,2,0,13,6,0,
+ + 2,0,14,7,0,2,0,13,6,0,2,0,13,6,0,2,0,14,7,0,2,0,13,6,0,
+ + 2,0,14,7,0,2,0,13,6,0,2,0,14,7,0/
+ DATA KDECRES2p /
+ + 2,0,14,7,0,2,0,13,6,0,2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,14,7,0,2,0,13,6,0,2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,14,7,0,2,0,13,6,0,2,0,13,23,0,2,0,14,7,0,2,0,13,6,0,
+ + 2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,14,7,0,2,0,13,6,0,2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,13,6,0,2,0,14,7,0,2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,13,6,0,2,0,14,7,0,2,0,40,8,0,2,0,41,6,0,2,0,42,7,0/
+ DATA KDECRES3p /
+ + 2,0,13,27,0,2,0,14,25,0,
+ + 2,0,14,7,0,2,0,13,6,0,2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,39,9,0,
+ + 2,0,14,7,0,2,0,13,6,0,
+ + 2,0,13,27,0,2,0,14,25,0,2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,13,27,0,2,0,14,25,0,
+ + 2,0,13,27,0,2,0,14,25,0,
+ + 2,0,13,6,0,2,0,14,7,0,
+ + 2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,2,0,13,27,0,2,0,14,25,0/
+ DATA KDECRES1n /
+ + 2,0,14,6,0,2,0,13,8,0,2,0,13,8,0,2,0,14,6,0,2,0,13,8,0,
+ + 2,0,14,6,0,2,0,13,8,0,2,0,14,6,0,2,0,13,8,0,2,0,14,6,0,
+ + 2,0,13,8,0,2,0,14,6,0,2,0,14,6,0,2,0,13,8,0,2,0,14,6,0,
+ + 2,0,13,8,0,2,0,14,6,0,2,0,13,8,0/
+ DATA KDECRES2n /
+ + 2,0,13,8,0,2,0,14,6,0,2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,13,8,0,2,0,14,6,0,2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,13,8,0,2,0,14,6,0,2,0,14,23,0,2,0,13,8,0,2,0,14,6,0,
+ + 2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,13,8,0,2,0,14,6,0,2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,14,6,0,2,0,13,8,0,2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,14,6,0,2,0,13,8,0,2,0,43,7,0,2,0,42,6,0,2,0,41,8,0/
+ DATA KDECRES3n /
+ + 2,0,14,27,0,2,0,13,26,0,
+ + 2,0,13,8,0,2,0,14,6,0,2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,39,21,0,
+ + 2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,14,27,0,2,0,13,26,0,
+ + 2,0,14,27,0,2,0,13,26,0,
+ + 2,0,14,6,0,2,0,13,8,0,
+ + 2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,2,0,14,27,0,2,0,13,26,0/
+ DATA RESLIMp /
+ + 0.,0.,0.,0.,0.,.54,10.,0.,0.,.54,1.09,10.,
+ + 0.,.71,10.,0.,0.,.54,.918,10.,
+ + 0.,.54,1.09,10.,0.,.54,1.09,10.,
+ + 0.,.54,1.09,10.,0.,.54,1.09,10./
+ DATA RESLIMn /
+ + 0.,.0,.0,.0,0.,.54,10.,0.,0.,.54,1.09,10.,
+ + 0.,.71,10.,0.,0.,.54,.918,10.,
+ + 0.,.54,10.,0.,0.,.54,1.09,10.,0.,.54,1.09,10.,
+ + 0.,.54,1.09,10./
+ DATA ELIMITSp /0,3,4,3,4,4,4,4,4/
+ DATA ELIMITSn /0,3,4,3,4,3,4,4,4/
+ DATA NAMPRESp /
+ + ' ','D+1232','N+1440','N+1520','N+1535','N+1650',
+ + 'N+1680','D+1700','D+1905','D+1950'/
+ DATA NAMPRESn /
+ + ' ','D01232','N01440','N01520','N01535','N01650',
+ + 'N01675','D01700','D01905','D01950'/
+ DATA BGAMMAp /
+ + 5.6,0.5,4.6,2.5,1.0,2.1,2.0,0.2,1.0/
+ DATA RATIOJp /
+ + 1.,0.5,1.,0.5,0.5,1.5,1.,1.5,2./
+ DATA WIDTHp /
+ + .11,.35,.11,.10,.16,.125,.29,.35,.3/
+ DATA BGAMMAn /
+ + 6.1,0.3,4.0,2.5,0.,0.2,2.0,0.2,1.0/
+ DATA RATIOJn /
+ + 1.,0.5,1.,0.5,0.5,1.5,1.,1.5,2./
+ DATA WIDTHn /
+ + .11,.35,.11,.10,.16,.15,.29,.35,.3/
+
+
+ DATA CBR /3*1.,0.,1.,1.,0.6351,0.8468,0.9027,0.9200,0.9518,1.,
+ + 0.6351,0.8468,0.9027,0.9200,0.9518,1.,0.2160,0.3398,0.4748,
+ + 0.6098,0.8049,1.,0.6861,1.,3*0.,0.5,1.,0.5,1.,
+ + 0.3890,0.7080,0.9440,0.9930,1.,0.,0.4420,0.6470,0.9470,0.9770,
+ + 0.9990,4*1.,0.6670,1.,9*0.,0.6670,1.,0.6670,1.,0.6670,1.,
+ + 0.8880,0.9730,1.,0.4950,0.8390,0.9870,1.,0.5160,5*1.,0.6410,1.,
+ + 1.,0.67,1.,0.33,1.,1.,0.88,0.94,1.,0.88,0.94,1.,0.88,0.94,1.,
+ + 0.33,1.,0.67,1.,0.678,0.914,1./
+ DATA AM / 0.,2*0.511E-3, 2*0.10566, 0.13497, 2*0.13957,
+ + 2*0.49365, 2*0.49767, 0.93827, 0.93957, 4*0.,0.93827,
+ + 0.93957, 2*0.49767, 0.54880,0.95750,2*0.76830,0.76860,
+ + 2*0.89183,2*0.89610,0.78195,1.01941,1.18937,1.19255,
+ + 1.19743,1.31490,1.32132,1.11563,1.23100,1.23500,
+ + 1.23400,1.23300,1.38280,1.38370,1.38720,
+ + 1.53180,1.53500,1.67243 /
+ DATA AM2 /0.,2*2.61121E-07,2*0.011164,0.018217,0.019480,
+ + 0.019480,0.243690,0.243690,0.247675,0.247675,0.880351,0.882792,
+ + 0.000000,0.000000,0.000000,0.000000,0.880351,0.882792,0.247675,
+ + 0.247675,0.301181,0.916806,0.590285,0.590285,0.590746,0.795361,
+ + 0.795361,0.802995,0.802995,0.611446,1.039197,1.414601,1.422176,
+ + 1.433839,1.728962,1.745887,1.244630,1.515361,1.525225,1.522765,
+ + 1.520289,1.912136,1.914626,1.924324,2.346411,2.356225,2.797022/
+ DATA IDB /
+ + 0,0,0,1,2,3,5,6,7,13,19,25,8*0,30,32,34,40,46,47,48,49,60,62,
+ + 64,66,69,73,75,76,77,78,79,81,82,84,86,87,90,93,96,98,100/
+ DATA KDEC /
+ + 3,1,15,2,18,0,3,1,16,3,17,0,2,0,1,1,8*0,2,0,4,17,0,0,2,0,5,18,0,
+ + 0,2,0,4,17,0,0,2,0,7,6,0,0,3,0,7,7,8,0,3,0,7,6,6,0,3,1,17,4,6,0,
+ + 3,1,15,2,6,0,2,0,5,18,0,0,2,0,8,6,0,0,3,0,8,8,7,0,3,0,8,6,6,0,3,
+ + 1,18,5,6,0,3,1,16,3,6,0,3,0,6,6,6,0,3,0,7,8,6,0,3,1,18,5,7,0,3,
+ + 1,17,4,8,0,3,1,16,3,7,0,3,1,15,2,8,0,2,0,7,8,0,0,2,0,6,6,20*0,1,
+ + 0,11,3*0,1,0,12,0,0,0,1,0,11,0,0,0,1,0,12,0,0,0,2,0,1,1,0,0,3,0,
+ + 6,6,6,0,3,0,7,8,6,0,3,0,1,7,8,0,3,0,1,3,2,7*0,3,0,7,8,23,0,3,0,6
+ + ,6,23,0,2,0,1,27,0,0,2,0,1,32,0,0,2,0,1,1,0,0,3,0,6,6,6,0,2,0,7,
+ + 6,0,0,2,0,8,6,0,0,2,0,7,8,0,0,2,0,21,7,0,0,2,0,9,6,0,0,54*0,2,0,
+ + 22,8,0,0,2,0,10,6,0,0,2,0,9,8,0,0,2,0,21,6,0,0,2,0,10,7,0,0,
+ + 2,0,22,6,0,0,3,0,7,8,6,0,2,0,1,6,0,0,2,0,7,8,0,0,2,0,9,10,0,
+ + 0,2,0,11,12,0,0,3,0,7,
+ + 8,6,0,2,0,1,23,0,0,2,0,13,6,0,0,2,0,14,7,0,0,2,0,39,1,0,0,2,
+ + 0,14,8,0,0,2,0,39,6,0,0,2,0,39,8,0,0,2,0,13,8,0,0,2,0,
+ + 14,6,0,0,2,0,13,7,0,0,2,0,13,6,
+ + 0,0,2,0,14,7,0,0,2,0,13,8,0,0,2,0,14,6,0,0,2,0,14,8,0,0,2,0,
+ + 39,7,0,0,2,0,34,6,0,0,2,0,35,7,0,0,2,0,39,6,0,0,2,0,34,8,0,0,
+ + 2,0,36,7,0,0,2,0,39,8,0,0,2,
+ + 0,35,8,0,0,2,0,36,6,0,0,2,0,37,6,0,0,2,0,38,7,0,0,2,0,
+ + 37,8,0,0,2,0,38,6,0,0,2,0,39,10,0,0,2,0,37,8,0,0,2,0,38,6,0,0/
+ DATA LBARP/1,3,2,5,4,6,8,7,10,9,11,12,-13,-14,16,15,18,17,13,14,
+ + 22,21,23,24,26,25,27,29,28,31,30,32,33,-34,-35,-36,-37,-38,-39,
+ + -40,-41,-42,-43,-44,-45,-46,-47,-48,-49/
+ DATA ICHP /0,1,-1,1,-1,0,1,-1,1,-1,0,0,1,0,4*0,-1,0,4*0,
+ + 1,-1,0,1,-1,4*0,1,0,-1,0,-1,0,2,1,0,-1,1,0,-1,0,-1,-1/
+ DATA ISTR /8*0,-1,+1,10,10,8*0,-1,+1,5*0,-1,+1,-1,+1,2*0,
+ + 3*1,2*2,1,4*0,3*1,2*2,3 /
+ DATA IBAR /12*0,2*1,4*0,2*-1,13*0,16*1/
+ DATA NAMP /
+ + ' ','gam ','e+','e-','mu+','mu-','pi0',
+ + 'pi+','pi-','k+', 'k-', 'k0l','k0s',
+ + 'p', 'n', 'nue', 'nueb', 'num', 'numb', 'pbar', 'nbar',
+ + 'k0', 'k0b', 'eta', 'etap', 'rho+', 'rho-','rho0',
+ + 'k*+','k*-','k*0','k*0b','omeg', 'phi', 'SIG+', 'SIG0',
+ + 'SIG-','XI0','XI-','LAM','DELT++','DELT+','DELT0','DELT-',
+ + 'SIG*+ ','SIG*0','SIG*-', 'XI*0', 'XI*-', 'OME*-'/
+ DATA S_LIFE /0.,0.,0.,2.197D-6,2.197D-6,8.4D-17,2.6033D-8,
+ + 2.6033D-8,1.2371D-8,1.2371D-8,
+ + 0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,
+ + 0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,
+ + 0.,0.,0./
+ END
+C->
+ BLOCK DATA SO_PARAM_INI
+C....This block data contains default values
+C. of the parameters used in fragmentation
+C................................................
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+ COMMON /SO_CZDIS/ FA, FB0
+ COMMON /SO_CZDISs/ FAs1, fAs2
+ COMMON /SO_CZLEAD/ CLEAD, FLEAD
+ COMMON /SO_CPSPL/ CCHIK(3,6:14)
+ COMMON /SO_CQDIS/ PPT0 (33),ptflag
+ COMMON /SO_CDIF0/ FFD, FBD, FDD
+ COMMON /SO_CFLAFR/ PAR(8)
+C...Longitudinal Fragmentation function
+ DATA FA /0.5/, FB0 /0.8/
+C...Longitudinal Fragmentation function for leading baryons
+ DATA CLEAD /0.0/, FLEAD /0.6/
+c strange fragmentation
+ data FAs1 /3./, fAs2 /3./
+c data FAs1 /0./, fAs2 /0./
+C...pT of sea partons
+ DATA PTFLAG /1./
+ DATA PPT0 /0.30,0.30,0.450,30*0.60/
+C...Splitting parameters
+ DATA CCHIK /21*2.,6*3./
+C...Parameters of flavor formation
+ DATA PAR /0.04,0.25,0.25,0.14,0.3,0.3,0.15,0./
+ END
+
+
+ SUBROUTINE gamma_h(Ecm,ip1,Imode,ifbad)
+C**********************************************************************
+C
+C simple simulation of low-energy interactions (R.E. 03/98)
+C
+C changed to simulate superposition of reggeon and pomeron exchange
+C interface to Lund / JETSET 7.4 fragmentation
+C (R.E. 08/98)
+C
+C
+C
+C input: ip1 incoming particle
+C 13 - p
+C 14 - n
+C Ecm CM energy in GeV
+C Imode interaction mode
+C 0 - multi-pion fragmentation
+C 5 - fragmentation in resonance region
+C 1 - quasi-elastic / diffractive interaction
+C (p/n-gamma --> n/p rho)
+C 4 - quasi-elastic / diffractive interaction
+C (p/n-gamma --> n/p omega)
+C 2 - direct interaction (p/n-gamma --> n/p pi)
+C 3 - direct interaction (p/n-gamma --> delta pi)
+C IFBAD control flag
+C (0 all OK,
+C 1 generation of interaction not possible)
+C
+C**********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON /SO_RUN/ SQS, S, Q2MIN, XMIN, ZMIN, kb, kt, a1, a2, Nproc
+ COMMON /SO_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+ COMMON /SO_CHP/ S_LIFE(49), ICHP(49), ISTR(49), IBAR(49)
+ COMMON /SO_MASS1/ AM(49), AM2(49)
+ COMMON /SO_CFLAFR/ PAR(8)
+ SAVE
+
+ DIMENSION P_dec(10,5), P_in(5)
+ DIMENSION xs1(2), xs2(2), xmi(2), xma(2)
+ DIMENSION LL(10), Ijoin(4)
+
+ DOUBLE PRECISION PA1(4), PA2(4), P1(4), P2(4)
+
+ DATA Ic / 0 /
+
+C second particle is always photon
+ IP2 = 1
+C parameters of pi0 suppression
+ a1 = 0.5D0
+ a2 = 0.5D0
+C parameter of strangeness suppression
+ PAR(2) = 0.18D0
+C slope of pomeron trajectory
+ alphap = 0.25D0
+
+ ifbad = 0
+ SQS = Ecm
+ S = SQS*SQS
+ Ic = Ic+1
+
+
+ IF((Imode.eq.1).or.(Imode.eq.4)) THEN
+
+C***********************************************************************
+
+C simulation of diffraction
+
+ ipa = ip1
+ ipb = ip2
+
+ if(Imode.eq.1) then
+ Nproc = 1
+ if(ip1.eq.1) then
+ ipa = 27
+ else if(ip2.eq.1) then
+ ipb = 27
+ endif
+ else if(Imode.eq.4) then
+ Nproc = 4
+ if(ip1.eq.1) then
+ ipa = 32
+ else if(ip2.eq.1) then
+ ipb = 32
+ endif
+ endif
+
+ am_a = AM(ipa)
+ am_b = AM(ipb)
+ if(am_a+am_b.ge.Ecm-1.D-2) am_a = Ecm - am_b-1.D-2
+
+C find t range
+ e1 = 0.5D0*(Ecm + AM(ip1)**2/Ecm - AM(ip2)**2/Ecm)
+ if(e1.gt.100.D0*AM(ip1)) then
+ pcm1 = e1 - 0.5D0*AM(ip1)**2/e1
+ else
+ pcm1 = sqrt((e1-AM(ip1))*(e1+AM(ip1)))
+ endif
+ e3 = 0.5D0*(Ecm + am_a**2/Ecm - am_b**2/Ecm)
+ if(e3.gt.100.D0*am_a) then
+ pcm3 = e3 - 0.5D0*am_a**2/e3
+ else
+ pcm3 = sqrt((e3-am_a)*(e3+am_a))
+ endif
+ t0 = ((AM(ip1)**2-am_a**2-AM(ip2)**2+am_b**2)/(2.D0*Ecm))**2
+ & -(pcm1-pcm3)**2-0.0001D0
+ t1 = ((AM(ip1)**2-am_a**2-AM(ip2)**2+am_b**2)/(2.D0*Ecm))**2
+ & -(pcm1+pcm3)**2+0.0001D0
+
+C sample t
+ b = 6.5D0+2.D0*alphap*log(S)
+ t = 1.D0/b*log((exp(b*t0)-exp(b*t1))*RNDM(0)+exp(b*t1))
+
+C kinematics
+ pl = (2.D0*e1*e3+t-AM(ip1)**2-am_a**2)/(2.D0*pcm1)
+ pt = (pcm3-pl)*(pcm3+pl)
+ if(pt.lt.0.D0) then
+ pl = sign(pcm3,pl)
+ pt = 1.D-6
+ else
+ pt = sqrt(pt)
+ endif
+ phi = 6.28318530717959D0*RNDM(0)
+
+ LLIST(1) = ipa
+ P(1,4) = e3
+ P(1,1) = SIN(phi)*pt
+ P(1,2) = COS(phi)*pt
+ P(1,3) = pl
+ P(1,5) = am_a
+ LLIST(2) = ipb
+ P(2,1) = -P(1,1)
+ P(2,2) = -P(1,2)
+ P(2,3) = -P(1,3)
+ P(2,4) = Ecm - P(1,4)
+ P(2,5) = am_b
+ np = 2
+
+ call DECSOP
+
+ ELSE IF((Imode.eq.2).or.(Imode.eq.3)) THEN
+
+C***********************************************************************
+
+C simulation of direct p-gamma process
+
+ if(ip1.eq.13) then
+C projectile is a proton
+ if(Imode.eq.2) then
+ Nproc = 2
+ ipa = 14
+ ipb = 7
+ else
+ Nproc = 3
+ if(rndm(0).gt.0.25) then
+ ipa = 40
+ ipb = 8
+ else
+ ipa = 42
+ ipb = 7
+ endif
+ endif
+ else if(ip1.eq.14) then
+C projectile is a neutron
+ if(Imode.eq.2) then
+ Nproc = 2
+ ipa = 13
+ ipb = 8
+ else
+ Nproc = 3
+ if(rndm(0).gt.0.25) then
+ ipa = 43
+ ipb = 7
+ else
+ ipa = 41
+ ipb = 8
+ endif
+ endif
+ endif
+
+ am_a = AM(ipa)
+ am_b = AM(ipb)
+ if(am_a+am_b.ge.Ecm-1.e-3) am_a = Ecm - am_b-1.D-3
+
+C find t range
+ e1 = 0.5D0*(Ecm + AM(ip1)**2/Ecm - AM(ip2)**2/Ecm)
+ if(e1.gt.100.D0*AM(ip1)) then
+ pcm1 = e1 - 0.5D0*AM(ip1)**2/e1
+ else
+ pcm1 = sqrt((e1-AM(ip1))*(e1+AM(ip1)))
+ endif
+ e3 = 0.5D0*(Ecm + am_a**2/Ecm - am_b**2/Ecm)
+ if(e3.gt.100.D0*am_a) then
+ pcm3 = e3 - 0.5D0*am_a**2/e3
+ else
+ pcm3 = sqrt((e3-am_a)*(e3+am_a))
+ endif
+ t0 = ((AM(ip1)**2-am_a**2-AM(ip2)**2+am_b**2)/(2.D0*Ecm))**2
+ & -(pcm1-pcm3)**2-0.0001D0
+ t1 = ((AM(ip1)**2-am_a**2-AM(ip2)**2+am_b**2)/(2.D0*Ecm))**2
+ & -(pcm1+pcm3)**2+0.0001D0
+
+C sample t
+ b = 12.D0
+ t = 1./b*log((exp(b*t0)-exp(b*t1))*RNDM(0)+exp(b*t1))
+
+C kinematics
+ pl = (2.D0*e1*e3+t-AM(ip1)**2-am_a**2)/(2.D0*pcm1)
+ pt = (pcm3-pl)*(pcm3+pl)
+ if(pt.lt.0.D0) then
+ pl = sign(pcm3,pl)
+ pt = 1.D-6
+ else
+ pt = sqrt(pt)
+ endif
+ phi = 6.28318530717959D0*RNDM(0)
+
+ LLIST(1) = ipa
+ P(1,4) = e3
+ P(1,1) = SIN(phi)*pt
+ P(1,2) = COS(phi)*pt
+ P(1,3) = pl
+ P(1,5) = am_a
+ LLIST(2) = ipb
+ P(2,1) = -P(1,1)
+ P(2,2) = -P(1,2)
+ P(2,3) = -P(1,3)
+ P(2,4) = Ecm - P(1,4)
+ P(2,5) = am_b
+ np = 2
+
+ call DECSOP
+
+ ELSE
+
+C***********************************************************************
+
+C simulation of multiparticle production via fragmentation
+
+ Nproc = 0
+
+ SIG_reg = 129.D0*(S-AM(13)**2)**(-0.4525D0)
+ SIG_pom = 67.7D0*(S-AM(13)**2)**0.0808D0
+
+ if(S.gt.2.6D0) then
+ prob_reg = SIG_reg/(SIG_pom+SIG_reg)
+ else
+ prob_reg = 1.D0
+ endif
+
+ ptu =.36D0+.08D0*log10(sqs/30.D0)
+
+ s1 = 1.2D0
+ s2 = 0.6D0
+ as1 = s1**2/S
+ as2 = s2**2/S
+ if(s1+s2.ge.sqs-0.2) then
+ prob_reg = 1.D0
+ endif
+
+ itry = 0
+ 100 continue
+ Istring = 0
+
+C avoid infinite looping
+ itry = itry+1
+ if(itry.gt.50) then
+ print *,' gamma_h: more than 50 internal rejections,'
+ print *,' called with ip1,ip2,Ecm,Imode:',ip1,ip2,Ecm,Imode
+ PAUSE
+ ifbad = 1
+ return
+ endif
+
+C simulate reggeon (one-string topology)
+
+ if(RNDM(0).lt.prob_reg) then
+
+ do i=1,1000
+ call valences(IP1,Ifl1a,Ifl1b)
+ call valences(IP2,Ifl2a,Ifl2b)
+ if(Ifl1b.eq.-Ifl2b) goto 200
+ enddo
+ print *,'gamma_h: simulation of reggeon impossible:',ip1,ip2
+ goto 100
+
+ 200 continue
+
+ np = 0
+ Istring = 1
+
+ ee = Ecm/2.D0
+ 250 continue
+ pt = ptu*sqrt(-log(max(1.D-10,RNDM(0))))
+ if(pt.ge.ee) goto 250
+ phi = 6.2831853D0*RNDM(0)
+ px = pt*COS(phi)
+ py = pt*SIN(phi)
+
+ pz = SQRT(ee**2-px**2-py**2)
+ call lund_put(1,Ifl1a,px,py,pz,ee)
+ px = -px
+ py = -py
+ pz = -pz
+ call lund_put(2,Ifl2a,px,py,pz,ee)
+ Ijoin(1) = 1
+ Ijoin(2) = 2
+ call lujoin(2,Ijoin)
+
+ call lund_frag(Ecm,NP)
+ if(NP.lt.0) then
+ if(Ideb.ge.5)
+ & print *,' gamma_h: rejection (1) by lund_frag, sqs:',Ecm
+ NP = 0
+ goto 100
+ endif
+
+ do i=1,NP
+ call lund_get(i,LLIST(i),
+ & P(i,1),P(i,2),P(i,3),P(i,4),P(i,5))
+ enddo
+
+
+C simulate pomeron (two-string topology)
+
+ else
+
+ call valences(IP1,Ifl1a,Ifl1b)
+ call valences(IP2,Ifl2a,Ifl2b)
+ if(Ifl1a*Ifl2a.lt.0) then
+ j = Ifl2a
+ Ifl2a = Ifl2b
+ Ifl2b = j
+ endif
+
+ pl1 = (1.D0+as1-as2)
+ ps1 = 0.25D0*pl1**2-as1
+ if(ps1.le.0.D0) then
+ if(Ideb.ge.5) print *,' rejection by x-limits (1) ',Ecm
+ prob_reg = 1.D0
+ goto 100
+ endif
+ ps1 = sqrt(ps1)
+ xmi(1) = 0.5D0*pl1-ps1
+ xma(1) = 0.5D0*pl1+ps1
+
+ pl2 = (1.D0+as2-as1)
+ ps2 = 0.25D0*pl2**2-as2
+ if(ps2.le.0.D0) then
+ if(Ideb.ge.5) print *,' rejection by x-limits (2) ',Ecm
+ prob_reg = 1.D0
+ goto 100
+ endif
+ ps2 = sqrt(ps2)
+ xmi(2) = 0.5D0*pl2-ps2
+ xma(2) = 0.5D0*pl2+ps2
+
+ if((xmi(1).ge.xma(1)+0.05D0).or.
+ & (xmi(2).ge.xma(2)+0.05D0)) then
+ if(Ideb.ge.5) print *,' rejection by x-limits (3) ',Ecm
+ prob_reg = 1.D0
+ goto 100
+ endif
+ call PO_SELSX2(xs1,xs2,xmi,xma,as1,as2,Irej)
+ if(Irej.ne.0) then
+ if(Ideb.ge.5) print *,
+ & 'gamma_h: rejection by PO_SELSX2, sqs,m1,m2:',Ecm,s1,s2
+ prob_reg = 1.D0
+ goto 100
+ endif
+
+ NP = 0
+ Istring = 1
+
+ ee = SQRT(XS1(1)*XS2(1))*Ecm/2.D0
+ 260 continue
+ pt = ptu*sqrt(-log(max(1.D-10,RNDM(0))))
+ if(pt.ge.ee) goto 260
+ phi = 6.2831853D0*RNDM(0)
+ px = pt*COS(phi)
+ py = pt*SIN(phi)
+
+ PA1(1) = px
+ PA1(2) = py
+ PA1(3) = XS1(1)*Ecm/2.D0
+ PA1(4) = PA1(3)
+
+ PA2(1) = -px
+ PA2(2) = -py
+ PA2(3) = -XS2(1)*Ecm/2.D0
+ PA2(4) = -PA2(3)
+
+ XM1 = 0.D0
+ XM2 = 0.D0
+ call PO_MSHELL(PA1,PA2,XM1,XM2,P1,P2)
+ px = P1(1)
+ py = P1(2)
+ pz = P1(3)
+ ee = P1(4)
+ call lund_put(1,Ifl1a,px,py,pz,ee)
+ px = P2(1)
+ py = P2(2)
+ pz = P2(3)
+ ee = P2(4)
+ call lund_put(2,Ifl2a,px,py,pz,ee)
+
+ Ijoin(1) = 1
+ Ijoin(2) = 2
+ call lujoin(2,Ijoin)
+
+ ee = SQRT(XS1(2)*XS2(2))*Ecm/2.D0
+ 270 continue
+ pt = ptu*sqrt(-log(max(1.D-10,RNDM(0))))
+ if(pt.ge.ee) goto 270
+ phi = 6.2831853D0*RNDM(0)
+ px = pt*COS(phi)
+ py = pt*SIN(phi)
+
+ PA1(1) = px
+ PA1(2) = py
+ PA1(3) = XS1(2)*Ecm/2.D0
+ PA1(4) = PA1(3)
+
+ PA2(1) = -px
+ PA2(2) = -py
+ PA2(3) = -XS2(2)*Ecm/2.D0
+ PA2(4) = -PA2(3)
+
+ XM1 = 0.D0
+ XM2 = 0.D0
+ call PO_MSHELL(PA1,PA2,XM1,XM2,P1,P2)
+
+ px = P1(1)
+ py = P1(2)
+ pz = P1(3)
+ ee = P1(4)
+ call lund_put(3,Ifl1b,px,py,pz,ee)
+ px = P2(1)
+ py = P2(2)
+ pz = P2(3)
+ ee = P2(4)
+ call lund_put(4,Ifl2b,px,py,pz,ee)
+
+ Ijoin(1) = 3
+ Ijoin(2) = 4
+ call lujoin(2,Ijoin)
+
+ call lund_frag(Ecm,NP)
+ if(NP.lt.0) then
+ if(Ideb.ge.5)
+ & print *,' gamma_h: rejection (2) by lund_frag, sqs:',Ecm
+ NP = 0
+ prob_reg = prob_reg+0.1D0
+ goto 100
+ endif
+
+ do i=1,NP
+ call lund_get(i,LLIST(i),
+ & P(i,1),P(i,2),P(i,3),P(i,4),P(i,5))
+ enddo
+
+ endif
+
+ if(Ideb.ge.10) then
+ print *,' multi-pion event',Istring,NP
+ call print_event(1)
+ endif
+
+C... for fragmentation in resonance region:
+ if (Imode.eq.5) goto 400
+
+C leading baryon/meson effect
+
+ do j=1,np
+ if(((LLIST(J).eq.13).or.(LLIST(J).eq.14))
+ & .and.(p(j,3).lt.0.D0)) then
+ if(rndm(0).lt.(2.D0*p(j,4)/Ecm)**2) goto 100
+ endif
+ if((LLIST(J).ge.6).and.(LLIST(J).le.8)
+ & .and.(p(j,3).lt.-0.4D0)) then
+ if(rndm(0).lt.(2.D0*p(j,4)/Ecm)**2) goto 100
+ endif
+ enddo
+
+C remove elastic/diffractive channels
+
+ ima_0 = 0
+ imb_0 = 0
+ ima_1 = 0
+ imb_1 = 0
+ ima_2 = 0
+ imb_2 = 0
+ imul = 0
+
+ if(ip1.eq.1) then
+ iba_0 = 6
+ iba_1 = 27
+ iba_2 = 32
+ else
+ iba_0 = ip1
+ iba_1 = ip1
+ iba_2 = ip1
+ endif
+ if(ip2.eq.1) then
+ ibb_0 = 6
+ ibb_1 = 27
+ ibb_2 = 32
+ else
+ ibb_0 = ip2
+ ibb_1 = ip2
+ ibb_2 = ip2
+ endif
+
+ do j=1,np
+ l1 = abs(LLIST(J))
+ if(l1.lt.10000) then
+ if(LLIST(J).eq.iba_0) ima_0 = 1
+ if(LLIST(J).eq.iba_1) ima_1 = 1
+ if(LLIST(J).eq.iba_2) ima_2 = 1
+ if(LLIST(J).eq.ibb_0) imb_0 = 1
+ if(LLIST(J).eq.ibb_1) imb_1 = 1
+ if(LLIST(J).eq.ibb_2) imb_2 = 1
+ imul = imul+1
+ endif
+ enddo
+
+ if(imul.eq.2) then
+ if(ima_0*imb_0.eq.1) goto 100
+ if(ima_1*imb_1.eq.1) goto 100
+ if(ima_2*imb_2.eq.1) goto 100
+ endif
+
+C remove direct channels
+
+ if((imul.eq.2).and.
+ & (ip2.eq.1).and.((ip1.eq.13).or.(ip1.eq.14))) then
+
+ ima_0 = 0
+ imb_0 = 0
+ ima_1 = 0
+ imb_1 = 0
+ ima_2 = 0
+ imb_2 = 0
+ ima_3 = 0
+ imb_3 = 0
+
+ if(ip1.eq.13) then
+ iba_0 = 14
+ ibb_0 = 7
+ iba_1 = 40
+ ibb_1 = 8
+ iba_2 = 42
+ ibb_2 = 7
+ iba_3 = 13
+ ibb_3 = 23
+ else
+ iba_0 = 13
+ ibb_0 = 8
+ iba_1 = 43
+ ibb_1 = 7
+ iba_2 = 41
+ ibb_2 = 8
+ iba_3 = 14
+ ibb_3 = 23
+ endif
+
+ do j=1,np
+ l1 = abs(LLIST(J))
+ if(l1.lt.10000) then
+ if(LLIST(J).eq.iba_0) ima_0 = 1
+ if(LLIST(J).eq.iba_1) ima_1 = 1
+ if(LLIST(J).eq.iba_2) ima_2 = 1
+ if(LLIST(J).eq.iba_3) ima_3 = 1
+ if(LLIST(J).eq.ibb_0) imb_0 = 1
+ if(LLIST(J).eq.ibb_1) imb_1 = 1
+ if(LLIST(J).eq.ibb_2) imb_2 = 1
+ if(LLIST(J).eq.ibb_3) imb_3 = 1
+ endif
+ enddo
+
+ if(ima_0*imb_0.eq.1) goto 100
+ if(ima_1*imb_1.eq.1) goto 100
+ if(ima_2*imb_2.eq.1) goto 100
+ if(ima_3*imb_3.eq.1) goto 100
+
+ endif
+
+C suppress events with many pi0's
+
+ ima_0 = 0
+ imb_0 = 0
+ do j=1,np
+C neutral mesons
+ if(LLIST(J).eq.6) ima_0 = ima_0+1
+ if(LLIST(J).eq.11) ima_0 = ima_0+1
+ if(LLIST(J).eq.12) ima_0 = ima_0+1
+ if(LLIST(J).eq.21) ima_0 = ima_0+1
+ if(LLIST(J).eq.22) ima_0 = ima_0+1
+ if(LLIST(J).eq.23) ima_0 = ima_0+1
+ if(LLIST(J).eq.24) ima_0 = ima_0+1
+ if(LLIST(J).eq.27) ima_0 = ima_0+1
+ if(LLIST(J).eq.32) ima_0 = ima_0+1
+ if(LLIST(J).eq.33) ima_0 = ima_0+1
+C charged mesons
+ if(LLIST(J).eq.7) imb_0 = imb_0+1
+ if(LLIST(J).eq.8) imb_0 = imb_0+1
+ if(LLIST(J).eq.9) imb_0 = imb_0+1
+ if(LLIST(J).eq.10) imb_0 = imb_0+1
+ if(LLIST(J).eq.25) imb_0 = imb_0+1
+ if(LLIST(J).eq.26) imb_0 = imb_0+1
+ enddo
+
+ prob_1 = a1*DBLE(imb_0)/max(DBLE(ima_0+imb_0),1.D0)+a2
+
+ if(RNDM(0).GT.prob_1) goto 100
+
+
+C correct multiplicity at very low energies
+
+ ND = 0
+
+ E_ref_1 = 1.6D0
+ E_ref_2 = 1.95D0
+
+ if((imul.eq.3)
+ & .and.(Ecm.gt.E_ref_1).and.(Ecm.lt.E_ref_2)) then
+
+ ima_0 = 0
+ ima_1 = 0
+ ima_2 = 0
+ imb_0 = 0
+ imb_1 = 0
+ iba_0 = 0
+ iba_1 = 0
+ iba_2 = 0
+ ibb_0 = 0
+ ibb_1 = 0
+C incoming proton
+ if(ip1.eq.13) then
+ iba_0 = 13
+ iba_1 = 7
+ iba_2 = 8
+ ibb_0 = 14
+ ibb_1 = 6
+C incoming neutron
+ else if(ip1.eq.14) then
+ iba_0 = 14
+ iba_1 = 7
+ iba_2 = 8
+ ibb_0 = 13
+ ibb_1 = 6
+ endif
+ do j=1,np
+ if(LLIST(J).eq.iba_0) ima_0 = ima_0+1
+ if(LLIST(J).eq.iba_1) ima_1 = ima_1+1
+ if(LLIST(J).eq.iba_2) ima_2 = ima_2+1
+ if(LLIST(J).eq.ibb_0) imb_0 = imb_0+1
+ if(LLIST(J).eq.ibb_1) imb_1 = imb_1+1
+ enddo
+
+C N gamma --> N pi+ pi-
+ if(ima_0*ima_1*ima_2.eq.1) then
+ Elog = LOG(Ecm)
+ Elog_1 = LOG(E_ref_1)
+ Elog_2 = LOG(E_ref_2)
+ prob = 0.1D0*4.D0/(Elog_2-Elog_1)**2
+ & *(Elog-Elog_1)*(Elog_2-Elog)
+
+ if(RNDM(0).lt.prob) then
+ LL(1) = ip1
+ LL(2) = 7
+ LL(3) = 8
+ LL(4) = 6
+ ND = 4
+ endif
+
+ endif
+
+ endif
+
+
+ E_ref_1 = 1.95D0
+ E_ref_2 = 2.55D0
+
+ if((imul.eq.4)
+ & .and.(Ecm.gt.E_ref_1).and.(Ecm.lt.E_ref_2)) then
+
+ ima_0 = 0
+ ima_1 = 0
+ ima_2 = 0
+ imb_0 = 0
+ imb_1 = 0
+ iba_0 = 0
+ iba_1 = 0
+ iba_2 = 0
+ ibb_0 = 0
+ ibb_1 = 0
+C incoming proton
+ if(ip1.eq.13) then
+ iba_0 = 13
+ iba_1 = 7
+ iba_2 = 8
+ ibb_0 = 14
+ ibb_1 = 6
+C incoming neutron
+ else if(ip1.eq.14) then
+ iba_0 = 14
+ iba_1 = 7
+ iba_2 = 8
+ ibb_0 = 13
+ ibb_1 = 6
+ endif
+ do j=1,np
+ if(LLIST(J).eq.iba_0) ima_0 = ima_0+1
+ if(LLIST(J).eq.iba_1) ima_1 = ima_1+1
+ if(LLIST(J).eq.iba_2) ima_2 = ima_2+1
+ if(LLIST(J).eq.ibb_0) imb_0 = imb_0+1
+ if(LLIST(J).eq.ibb_1) imb_1 = imb_1+1
+ enddo
+
+C N gamma --> N pi+ pi- pi0
+ if(ima_0*ima_1*ima_2*imb_1.eq.1) then
+ Elog = LOG(Ecm)
+ Elog_2 = LOG(E_ref_2)
+ Elog_1 = LOG(E_ref_1)
+ prob = 0.1D0*4.D0/(Elog_2-Elog_1)**2
+ & *(Elog-Elog_1)*(Elog_2-Elog)
+
+ if(RNDM(0).lt.prob) then
+ if(ip1.eq.13) then
+ LL(1) = 14
+ LL(2) = 7
+ LL(3) = 7
+ LL(4) = 8
+ else
+ LL(1) = 13
+ LL(2) = 7
+ LL(3) = 8
+ LL(4) = 8
+ endif
+ ND = 4
+ endif
+
+ endif
+
+ endif
+
+
+ if(ND.gt.0) then
+ P_in(1) = 0.D0
+ P_in(2) = 0.D0
+ P_in(3) = 0.D0
+ P_in(4) = Ecm
+ P_in(5) = Ecm
+ call SO_DECPAR(0,P_in,ND,LL,P_dec)
+ Iflip = 0
+ do j=1,ND
+ LLIST(j) = LL(j)
+ do k=1,5
+ P(j,k) = P_dec(j,k)
+ enddo
+ if(((LLIST(j).eq.13).or.(LLIST(j).eq.14))
+ & .and.(P(j,3).lt.0.D0)) Iflip = 1
+ enddo
+ if(Iflip.ne.0) then
+ do j=1,ND
+ P(j,3) = -P(j,3)
+ enddo
+ endif
+ NP = ND
+ endif
+
+C... for fragmentation in resonance region:
+ 400 continue
+
+ call DECSOP
+
+ ENDIF
+
+ if(Ideb.ge.10) then
+ if(Ideb.ge.20) then
+ call print_event(2)
+ else
+ call print_event(1)
+ endif
+ endif
+
+ IQchr = ICHP(ip1)+ICHP(ip2)
+ IQbar = IBAR(ip1)+IBAR(ip2)
+ call check_event(-Ic,Ecm,0.D0,0.D0,0.D0,IQchr,IQbar,Irej)
+
+ end
+
+
+ SUBROUTINE print_event(Iout)
+C*********************************************************************
+C
+C print final state particles
+C
+C (R.E. 03/98)
+C
+C**********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON /SO_RUN/ SQS, S, Q2MIN, XMIN, ZMIN, kb, kt, a1, a2, Nproc
+ COMMON /SO_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+ COMMON /SO_CSYDEC/ CBR(102), IDB(49), KDEC(612), LBARP(49)
+ COMMON /SO_CHP/ S_LIFE(49), ICHP(49), ISTR(49), IBAR(49)
+ COMMON /SO_MASS1/ AM(49), AM2(49)
+ COMMON /SO_CNAM/ NAMP (0:49)
+ CHARACTER*6 NAMP
+ CHARACTER CODE*18
+ SAVE
+
+ if(iout.gt.0) then
+
+ print *,' --------------------------------------------------'
+
+ if(Nproc.eq.1) then
+ print *,' diffractive rho-0 production',Nproc
+ else if(Nproc.eq.2) then
+ print *,' direct interaction 1',Nproc
+ else if(Nproc.eq.3) then
+ print *,' direct interaction 2',Nproc
+ else if(Nproc.eq.4) then
+ print *,' diffractive omega production',Nproc
+ else if(Nproc.eq.0) then
+ print *,' multi-pion/fragmentation contribution',Nproc
+ else if((Nproc.gt.10).and.(Nproc.lt.20)) then
+ print *,' resonance production and decay',Nproc-10
+ else
+ print *,' unknown process',Nproc
+ endif
+
+ i0 = 0
+ px = 0.D0
+ py = 0.D0
+ pz = 0.D0
+ ee = 0.D0
+ ichar = 0
+ ibary = 0
+ do j=1,np
+ l1 = abs(LLIST(J))
+ l = mod(llist(j),10000)
+ if(l1.lt.10000) then
+ px = px + P(j,1)
+ py = py + P(j,2)
+ pz = pz + P(j,3)
+ ee = ee + P(j,4)
+ ichar = ichar+sign(1,l)*ICHP(iabs(l))
+ ibary = ibary+sign(1,l)*IBAR(iabs(l))
+ endif
+ if((l1.lt.10000).or.(Iout.GE.2)) then
+ i0 = i0+1
+ code = ' '
+ code(1:6) = namp(iabs(l))
+ if (l .lt. 0) code(7:9) = 'bar'
+ write (6,120) i0,CODE,l1*sign(1,l),sign(1,l)*ICHP(iabs(l)),
+ & (P(j,k),k=1,4)
+ endif
+ enddo
+ write (6,122) ' sum: ',px,py,pz,ee
+ print *,' charge QN: ',ichar,' baryon QN: ',ibary
+ print *,' --------------------------------------------------'
+120 FORMAT(1X,I4,1X,A18,1X,I6,1X,I2,1X,2(F9.3,2X),2(E9.3,2X))
+122 FORMAT(7X,A8,20X,2(F9.3,2X),2(E9.3,2X))
+
+ endif
+
+ END
+
+
+ SUBROUTINE check_event(Ic,Esum,PXsum,PYsum,PZsum,IQchr,IQbar,Irej)
+C***********************************************************************
+C
+C check energy-momentum and quantum number conservation
+C
+C (R.E. 08/98)
+C
+C***********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON /SO_RUN/ SQS, S, Q2MIN, XMIN, ZMIN, kb, kt, a1, a2, Nproc
+ COMMON /SO_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+ COMMON /SO_CSYDEC/ CBR(102), IDB(49), KDEC(612), LBARP(49)
+ COMMON /SO_CHP/ S_LIFE(49), ICHP(49), ISTR(49), IBAR(49)
+ COMMON /SO_MASS1/ AM(49), AM2(49)
+ COMMON /SO_CNAM/ NAMP (0:49)
+ CHARACTER*6 NAMP
+ SAVE
+
+ px = 0.D0
+ py = 0.D0
+ pz = 0.D0
+ ee = 0.D0
+ ichar = 0
+ ibary = 0
+ Iprint = 0
+
+ PLscale = Esum
+ PTscale = 1.D0
+
+ do j=1,np
+ l1 = abs(LLIST(J))
+ l = mod(llist(j),10000)
+ if(l1.lt.10000) then
+ px = px + P(j,1)
+ py = py + P(j,2)
+ pz = pz + P(j,3)
+ ee = ee + P(j,4)
+ ichar = ichar+sign(1,l)*ICHP(iabs(l))
+ ibary = ibary+sign(1,l)*IBAR(iabs(l))
+ endif
+ enddo
+
+ if(ichar.ne.IQchr) then
+ print *,' charge conservation violated',Ic
+ Iprint = 1
+ endif
+ if(ibary.ne.IQbar) then
+ print *,' baryon number conservation violated',Ic
+ Iprint = 1
+ endif
+ if(abs((px-PXsum)/MAX(PXsum,PTscale)).gt.1.D-3) then
+ print *,' x momentum conservation violated',Ic
+ Iprint = 1
+ endif
+ if(abs((py-PYsum)/MAX(PYsum,PTscale)).gt.1.D-3) then
+ print *,' y momentum conservation violated',Ic
+ Iprint = 1
+ endif
+ if(abs((pz-Pzsum)/MAX(ABS(PZsum),PLscale)).gt.1.D-3) then
+ print *,' z momentum conservation violated',Ic
+ Iprint = 1
+ endif
+ if(abs((ee-Esum)/MAX(Esum,1.D0)).gt.1.D-3) then
+ print *,' energy conservation violated',Ic
+ Iprint = 1
+ endif
+
+ if(Iprint.ne.0) call print_event(1)
+
+ Irej = Iprint
+
+ END
+
+
+ SUBROUTINE valences(ip,ival1,ival2)
+C**********************************************************************
+C
+C valence quark composition of various particles (R.E. 03/98)
+C (with special treatment of photons)
+C
+C**********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+ if(ip.eq.1) then
+ if(rndm(0).gt.0.2D0) then
+ ival1 = 1
+ ival2 = -1
+ else
+ ival1 = 2
+ ival2 = -2
+ endif
+ else if(ip.eq.6) then
+ if(rndm(0).gt.0.5D0) then
+ ival1 = 1
+ ival2 = -1
+ else
+ ival1 = 2
+ ival2 = -2
+ endif
+ else if(ip.eq.7) then
+ ival1 = 1
+ ival2 = -2
+ else if(ip.eq.8) then
+ ival1 = 2
+ ival2 = -1
+ else if(ip.eq.13) then
+ Xi = rndm(0)
+ if(Xi.lt.0.3333D0) then
+ ival1 = 12
+ ival2 = 1
+ else if(Xi.lt.0.6666D0) then
+ ival1 = 21
+ ival2 = 1
+ else
+ ival1 = 11
+ ival2 = 2
+ endif
+ else if(ip.eq.14) then
+ Xi = rndm(0)
+ if(Xi.lt.0.3333D0) then
+ ival1 = 12
+ ival2 = 2
+ else if(Xi.lt.0.6666D0) then
+ ival1 = 21
+ ival2 = 2
+ else
+ ival1 = 22
+ ival2 = 1
+ endif
+ endif
+
+ if((ip.lt.13).and.(rndm(0).lt.0.5D0)) then
+ k = ival1
+ ival1 = ival2
+ ival2 = k
+ endif
+
+ END
+
+
+ SUBROUTINE DECSOP
+C***********************************************************************
+C
+C Decay all unstable particle in SIBYLL
+C decayed particle have the code increased by 10000
+C
+C (taken from SIBYLL 1.7, R.E. 04/98)
+C
+C***********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON /SO_CSYDEC/ CBR(102), IDB(49), KDEC(612), LBARP(49)
+ COMMON /SO_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+ COMMON /SO_PLIST1/ LLIST1(2000)
+ SAVE
+
+ DIMENSION P0(5), LL(10), PD(10,5)
+
+ NN = 1
+ DO J=1,NP
+ LLIST1(J) = 0
+ ENDDO
+ DO WHILE (NN .LE. NP)
+ L= LLIST(NN)
+ IF (IDB(IABS(L)) .GT. 0) THEN
+ DO K=1,5
+ P0(K) = P(NN,K)
+ ENDDO
+ ND = 0
+ CALL SO_DECPAR (L,P0,ND,LL,PD)
+ LLIST(NN) = LLIST(NN)+ISIGN(10000,LLIST(NN))
+ DO J=1,ND
+ DO K=1,5
+ P(NP+J,K) = PD(J,K)
+ ENDDO
+ LLIST(NP+J)=LL(J)
+ LLIST1(NP+J)=NN
+ ENDDO
+ NP=NP+ND
+ ENDIF
+ NN = NN+1
+ ENDDO
+
+ END
+
+
+ SUBROUTINE SO_DECPAR(LA,P0,ND,LL,P)
+C***********************************************************************
+C
+C This subroutine generates the decay of a particle
+C with ID = LA, and 5-momentum P0(1:5)
+C into ND particles of 5-momenta P(j,1:5) (j=1:ND)
+C
+C If the initial particle code is LA=0
+C then ND and LL(1:ND) are considered as input and
+C the routine generates a phase space decay into ND
+C particles of codes LL(1:nd)
+C
+C (taken from SIBYLL 1.7, muon decay corrected, R.E. 04/98)
+C
+C***********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON /SO_CSYDEC/ CBR(102), IDB(49), KDEC(612), LBARP(49)
+ COMMON /SO_MASS1/ AM(49), AM2(49)
+ SAVE
+
+ DIMENSION P0(5), LL(10), P(10,5)
+ DIMENSION PV(10,5), RORD(10), UE(3),BE(3), FACN(3:10)
+
+ DATA FACN /2.D0,5.D0,15.D0,60.D0,250.D0,
+ + 1500.D0,12000.D0,120000.D0/
+ DATA PI /3.1415926D0/
+
+C...c.m.s. Momentum in two particle decays
+ PAWT(A,B,C) = SQRT((A**2-(B+C)**2)*(A**2-(B-C)**2))/(2.D0*A)
+
+C...Phase space decay into the particles in the list
+ IF (LA .EQ. 0) THEN
+ MAT = 0
+ MBST = 0
+ PS = 0.
+ DO J=1,ND
+ P (J,5) = AM(IABS(LL(J)))
+ PV(J,5) = AM(IABS(LL(J)))
+ PS = PS+P(J,5)
+ ENDDO
+ DO J=1,4
+ PV(1,J) = P0(J)
+ ENDDO
+ PV(1,5) = P0(5)
+ GOTO 140
+ ENDIF
+
+C...Choose decay channel
+ L = IABS(LA)
+ ND=0
+ IDC = IDB(L)-1
+ IF (IDC+1 .LE.0) RETURN
+ RBR = RNDM(0)
+110 IDC=IDC+1
+ IF(RBR.GT.CBR(IDC)) GOTO 110
+
+ KD =6*(IDC-1)+1
+ ND = KDEC(KD)
+ MAT= KDEC(KD+1)
+
+ MBST=0
+ IF (MAT .GT.0 .AND. P0(4) .GT. 20.D0*P0(5)) MBST=1
+ IF (MAT .GT.0 .AND. MBST .EQ. 0)
+ + BETA = SQRT(P0(1)**2+P0(2)**2+P0(3)**2)/P0(4)
+
+ PS = 0.D0
+ DO J=1,ND
+ LL(J) = KDEC(KD+1+J)
+ P(J,5) = AM(LL(J))
+ PV(J,5) = AM(LL(J))
+ PS = PS + P(J,5)
+ ENDDO
+ DO J=1,4
+ PV(1,J) = 0.D0
+ IF (MBST .EQ. 0) PV(1,J) = P0(J)
+ ENDDO
+ IF (MBST .EQ. 1) PV(1,4) = P0(5)
+ PV(1,5) = P0(5)
+
+140 IF (ND .EQ. 2) GOTO 280
+
+ IF (ND .EQ. 1) THEN
+ DO J=1,4
+ P(1,J) = P0(J)
+ ENDDO
+ RETURN
+ ENDIF
+
+C...Calculate maximum weight for ND-particle decay
+ WWTMAX = 1.D0/FACN(ND)
+ PMAX=PV(1,5)-PS+P(ND,5)
+ PMIN=0.D0
+ DO IL=ND-1,1,-1
+ PMAX = PMAX+P(IL,5)
+ PMIN = PMIN+P(IL+1,5)
+ WWTMAX = WWTMAX*PAWT(PMAX,PMIN,P(IL,5))
+ ENDDO
+
+C...generation of the masses, compute weight, if rejected try again
+240 RORD(1) = 1.D0
+ DO 260 IL1=2,ND-1
+ RSAV = RNDM(0)
+ DO 250 IL2=IL1-1,1,-1
+ IF(RSAV.LE.RORD(IL2)) GOTO 260
+250 RORD(IL2+1)=RORD(IL2)
+260 RORD(IL2+1)=RSAV
+ RORD(ND) = 0.D0
+ WT = 1.D0
+ DO 270 IL=ND-1,1,-1
+ PV(IL,5)=PV(IL+1,5)+P(IL,5)+(RORD(IL)-RORD(IL+1))*(PV(1,5)-PS)
+270 WT=WT*PAWT(PV(IL,5),PV(IL+1,5),P(IL,5))
+ IF (WT.LT.RNDM(0)*WWTMAX) GOTO 240
+
+C...Perform two particle decays in respective cm frame
+280 DO 300 IL=1,ND-1
+ PA=PAWT(PV(IL,5),PV(IL+1,5),P(IL,5))
+ UE(3)=2.D0*RNDM(0)-1.D0
+ PHI=2.D0*PI*RNDM(0)
+ UT = SQRT(1.D0-UE(3)**2)
+ UE(1) = UT*COS(PHI)
+ UE(2) = UT*SIN(PHI)
+ DO 290 J=1,3
+ P(IL,J)=PA*UE(J)
+290 PV(IL+1,J)=-PA*UE(J)
+ P(IL,4)=SQRT(PA**2+P(IL,5)**2)
+300 PV(IL+1,4)=SQRT(PA**2+PV(IL+1,5)**2)
+
+C...Lorentz transform decay products to lab frame
+ DO 310 J=1,4
+310 P(ND,J)=PV(ND,J)
+ DO 340 IL=ND-1,1,-1
+ DO 320 J=1,3
+320 BE(J)=PV(IL,J)/PV(IL,4)
+ GA=PV(IL,4)/PV(IL,5)
+ DO 340 I=IL,ND
+ BEP = BE(1)*P(I,1)+BE(2)*P(I,2)+BE(3)*P(I,3)
+ DO 330 J=1,3
+330 P(I,J)=P(I,J)+GA*(GA*BEP/(1.+GA)+P(I,4))*BE(J)
+340 P(I,4)=GA*(P(I,4)+BEP)
+
+C...Weak decays
+ IF (MAT .EQ. 1) THEN
+ F1=P(2,4)*P(3,4)-P(2,1)*P(3,1)-P(2,2)*P(3,2)-P(2,3)*P(3,3)
+ IF (MBST.EQ.1) WT = P0(5)*P(1,4)*F1
+ IF (MBST.EQ.0)
+ + WT=F1*(P(1,4)*P0(4)-P(1,1)*P0(1)-P(1,2)*P0(2)-P(1,3)*P0(3))
+ WTMAX = P0(5)**4/16.D0
+ IF(WT.LT.RNDM(0)*WTMAX) GOTO 240
+ ENDIF
+
+
+C...Boost back for rapidly moving particle
+ IF (MBST .EQ. 1) THEN
+ DO 440 J=1,3
+440 BE(J)=P0(J)/P0(4)
+ GA= P0(4)/P0(5)
+ DO 460 I=1,ND
+ BEP=BE(1)*P(I,1)+BE(2)*P(I,2)+BE(3)*P(I,3)
+ DO 450 J=1,3
+450 P(I,J)=P(I,J)+GA*(GA*BEP/(1.+GA)+P(I,4))*BE(J)
+460 P(I,4)=GA*(P(I,4)+BEP)
+ ENDIF
+
+C...labels for antiparticle decay
+ IF (LA .LT. 0 .AND. L .GT. 18) THEN
+ DO J=1,ND
+ LL(J) = LBARP(LL(J))
+ ENDDO
+ ENDIF
+
+ END
+
+
+ SUBROUTINE PO_ALTRA(GA,BGX,BGY,BGZ,PCX,PCY,PCZ,EC,P,PX,PY,PZ,E)
+C*********************************************************************
+C
+C arbitrary Lorentz transformation
+C
+C (taken from PHOJET v1.12, R.E. 08/98)
+C
+C*********************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ SAVE
+
+ EP=PCX*BGX+PCY*BGY+PCZ*BGZ
+ PE=EP/(GA+1.D0)+EC
+ PX=PCX+BGX*PE
+ PY=PCY+BGY*PE
+ PZ=PCZ+BGZ*PE
+ P=SQRT(PX*PX+PY*PY+PZ*PZ)
+ E=GA*EC+EP
+
+ END
+
+
+ SUBROUTINE PO_TRANS(XO,YO,ZO,CDE,SDE,CFE,SFE,X,Y,Z)
+C**********************************************************************
+C
+C rotation of coordinate frame (1) de rotation around y axis
+C (2) fe rotation around z axis
+C
+C (taken from PHOJET v1.12, R.E. 08/98)
+C
+C**********************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ SAVE
+
+ X= CDE*CFE*XO-SFE*YO+SDE*CFE*ZO
+ Y= CDE*SFE*XO+CFE*YO+SDE*SFE*ZO
+ Z=-SDE *XO +CDE *ZO
+
+ END
+
+
+ SUBROUTINE PO_SELSX2(XS1,XS2,XMIN,XMAX,AS1,AS2,IREJ)
+C***********************************************************************
+C
+C select x values of soft string ends using PO_RNDBET
+C
+C (taken from PHOJET v1.12, R.E. 08/98)
+C
+C***********************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+
+ DIMENSION XS1(2),XS2(2)
+ DIMENSION XMIN(2),XMAX(2)
+
+ IREJ = 0
+
+ GAM1 = +1.5D0 + 1.D0
+ GAM2 = -0.5D0 + 1.D0
+ BET1 = -0.5D0 + 1.D0
+ BET2 = -0.5D0 + 1.D0
+
+ ITRY0 = 0
+ DO 100 I=1,100
+
+ ITRY1 = 0
+ 10 CONTINUE
+ X1 = PO_RNDBET(GAM1,BET1)
+ ITRY1 = ITRY1+1
+ IF(ITRY1.GE.50) THEN
+ IREJ = 1
+ RETURN
+ ENDIF
+ IF((X1.LE.XMIN(1)).OR.(X1.GE.XMAX(1))) GOTO 10
+
+ ITRY2 = 0
+ 11 CONTINUE
+ X2 = PO_RNDBET(GAM2,BET2)
+ ITRY2 = ITRY2+1
+ IF(ITRY2.GE.50) THEN
+ IREJ = 2
+ RETURN
+ ENDIF
+ IF((X2.LE.XMIN(2)).OR.(X2.GE.XMAX(2))) GOTO 11
+
+ X3 = 1.D0 - X1
+ X4 = 1.D0 - X2
+ IF(X1*X2.GT.AS1) THEN
+ IF(X3*X4.GT.AS2) GOTO 300
+ ENDIF
+ ITRY0 = ITRY0+1
+
+ 100 CONTINUE
+
+ IREJ = 3
+ RETURN
+
+ 300 CONTINUE
+
+ XS1(1) = X1
+ XS1(2) = X3
+
+ XS2(1) = X2
+ XS2(2) = X4
+
+ END
+
+
+ DOUBLE PRECISION FUNCTION PO_RNDBET(GAM,ETA)
+C********************************************************************
+C
+C random number generation from beta
+C distribution in region 0 < X < 1.
+C F(X) = X**(GAM-1.)*(1.-X)**(ETA-1)*GAMM(ETA+GAM) / (GAMM(GAM
+C *GAMM(ETA))
+C
+C (taken from PHOJET v1.12, R.E. 08/98)
+C
+C********************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+
+ Y = PO_RNDGAM(1.D0,GAM)
+ Z = PO_RNDGAM(1.D0,ETA)
+ PO_RNDBET = Y/(Y+Z)
+
+ END
+
+
+ DOUBLE PRECISION FUNCTION PO_RNDGAM(ALAM,ETA)
+C********************************************************************
+C
+C random number selection from gamma distribution
+C F(X) = ALAM**ETA*X**(ETA-1)*EXP(-ALAM*X) / GAM(ETA)
+C
+C (taken from PHOJET v1.12, R.E. 08/98)
+C
+C********************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+
+ NCOU=0
+ N = ETA
+ F = ETA - N
+ IF(F.EQ.0.D0) GOTO 20
+ 10 R = RNDM(0)
+ NCOU=NCOU+1
+ IF (NCOU.GE.11) GOTO 20
+ IF(R.LT.F/(F+2.71828D0)) GOTO 30
+ YYY=LOG(RNDM(0)+1.e-7)/F
+ IF(ABS(YYY).GT.50.D0) GOTO 20
+ Y = EXP(YYY)
+ IF(LOG(RNDM(0)+1.D-7).GT.-Y) GOTO 10
+ GOTO 40
+ 20 Y = 0.D0
+ GOTO 50
+ 30 Y = 1.D0-LOG(RNDM(0)+1.D-7)
+ IF(RNDM(0).GT.Y**(F-1.D0)) GOTO 10
+ 40 IF(N.EQ.0) GOTO 70
+ 50 Z = 1.D0
+ DO 60 I = 1,N
+ 60 Z = Z*RNDM(0)
+ Y = Y-LOG(Z+1.D-7)
+ 70 PO_RNDGAM = Y/ALAM
+
+ END
+
+
+ SUBROUTINE lund_frag(SQS,NP)
+C***********************************************************************
+C
+C interface to Lund/Jetset fragmentation
+C
+C (R.E. 08/98)
+C
+C***********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5)
+ SAVE
+
+ DATA init / 0 /
+
+
+ if(init.eq.0) then
+
+C no title page
+
+ MSTU(12) = 0
+
+C define some particles as stable
+
+ MSTJ(22) = 2
+
+C in addition pi0 stable
+
+ KC=LUCOMP(111)
+ MDCY(KC,1)=0
+
+C switch popcorn effect off
+
+ MSTJ(12) = 1
+
+C suppress all warning and error messages
+
+ MSTU(22) = 0
+ MSTU(25) = 0
+
+ init = 1
+
+ endif
+
+
+C set energy dependent parameters
+
+ IF(SQS.LT.2.D0) THEN
+ PARJ(36) = 0.1D0
+ ELSE IF(SQS.LT.4.D0) THEN
+ PARJ(36) = 0.7D0*(SQS-2.D0)/2.D0+0.1D0
+ ELSE
+ PARJ(36) = 0.8D0
+ ENDIF
+
+C fragment string configuration
+
+ II = MSTU(21)
+ MSTU(21) = 1
+ CALL LUEXEC
+ MSTU(21) = II
+
+C event accepted?
+
+ if(MSTU(24).ne.0) then
+ NP = -1
+ return
+ endif
+
+ CALL LUEDIT(1)
+
+ NP = KLU(0,1)
+
+ END
+
+
+ SUBROUTINE lund_put(I,IFL,PX,PY,PZ,EE)
+C***********************************************************************
+C
+C store initial configuration into Lund common block
+C
+C (R.E. 08/98)
+C
+C***********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5)
+ SAVE
+
+ if(IFL.eq.1) then
+ Il = 2
+ else if(IFL.eq.-1) then
+ Il = -2
+ else if(IFL.eq.2) then
+ Il = 1
+ else if(IFL.eq.-2) then
+ Il = -1
+ else if(IFL.eq.11) then
+ Il = 2203
+ else if(IFL.eq.12) then
+ Il = 2101
+ else if(IFL.eq.21) then
+ Il = 2103
+ else if(IFL.eq.22) then
+ Il = 1103
+ else
+ print *,' lund_put: unkown flavor code',IFL
+ endif
+
+ P(I,1) = PX
+ P(I,2) = PY
+ P(I,3) = PZ
+ P(I,4) = EE
+ P(I,5) = (EE-PZ)*(EE+PZ)-PX**2-PY**2
+
+ K(I,1) = 1
+ K(I,2) = Il
+ K(I,3) = 0
+ K(I,4) = 0
+ K(I,5) = 0
+
+ N = I
+
+ END
+
+
+ SUBROUTINE lund_get(I,IFL,PX,PY,PZ,EE,XM)
+C***********************************************************************
+C
+C read final states from Lund common block
+C
+C (R.E. 08/98)
+C
+C***********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5)
+ SAVE
+
+ PX = PLU(I,1)
+ PY = PLU(I,2)
+ PZ = PLU(I,3)
+ EE = PLU(I,4)
+ XM = PLU(I,5)
+
+ Il = KLU(I,8)
+
+C convert particle ID
+
+ IFL = ICON_PDG_SIB(Il)
+
+ END
+
+
+
+ INTEGER FUNCTION ICON_PDG_SIB(ID)
+C************************************************************************
+C
+C convert PDG particle codes to SIBYLL particle codes
+C
+C (R.E. 09/97)
+C
+C************************************************************************
+ SAVE
+
+ DIMENSION ITABLE(49)
+ DATA ITABLE /
+ & 22, -11, 11, -13, 13, 111, 211, -211, 321, -321, 130, 310, 2212,
+ & 2112, 12, -12, 14, -14, -99999999, -99999999, 311, -311, 221,
+ & 331, 213, -213, 113, 323, -323, 313, -313, 223, 333, 3222, 3212,
+ & 3112, 3322, 3312, 3122, 2224, 2214, 2114, 1114, 3224, 3214,
+ & 3114, 3324, 3314, 3334 /
+
+ IDPDG = ID
+
+ 100 CONTINUE
+ IDA = ABS(ID)
+
+ IF(IDA.GT.1000) THEN
+ IS = IDA
+ IC = SIGN(1,IDPDG)
+ ELSE
+ IS = IDPDG
+ IC = 1
+ ENDIF
+
+ DO I=1,49
+ IF(IS.EQ.ITABLE(I)) THEN
+ ICON_PDG_SIB = I*IC
+ RETURN
+ ENDIF
+ ENDDO
+
+ IF(IDPDG.EQ.80000) THEN
+ ICON_PDG_SIB = 13
+ ELSE
+ print *,'ICON_PDG_DTU: no particle found for ',IDPDG
+ ICON_PDG_SIB = 0
+ RETURN
+ ENDIF
+
+ END
+
+
+
+ SUBROUTINE PO_MSHELL(PA1,PA2,XM1,XM2,P1,P2)
+C********************************************************************
+C
+C rescaling of momenta of two partons to put both
+C on mass shell
+C
+C input: PA1,PA2 input momentum vectors
+C XM1,2 desired masses of particles afterwards
+C P1,P2 changed momentum vectors
+C
+C (taken from PHOJET 1.12, R.E. 08/98)
+C
+C********************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ SAVE
+
+ PARAMETER ( DEPS = 1.D-5 )
+
+ DIMENSION PA1(4),PA2(4),P1(4),P2(4)
+
+C Lorentz transformation into system CMS
+ PX = PA1(1)+PA2(1)
+ PY = PA1(2)+PA2(2)
+ PZ = PA1(3)+PA2(3)
+ EE = PA1(4)+PA2(4)
+ XMS = EE**2-PX**2-PY**2-PZ**2
+ XMS = SQRT(XMS)
+ BGX = PX/XMS
+ BGY = PY/XMS
+ BGZ = PZ/XMS
+ GAM = EE/XMS
+ CALL PO_ALTRA(GAM,-BGX,-BGY,-BGZ,PA1(1),PA1(2),PA1(3),
+ & PA1(4),PTOT1,P1(1),P1(2),P1(3),P1(4))
+C rotation angles
+ PTOT1 = MAX(DEPS,PTOT1)
+ COD= P1(3)/PTOT1
+ SID= SQRT((1.D0-COD)*(1.D0+COD))
+ COF=1.D0
+ SIF=0.D0
+ IF(PTOT1*SID.GT.1.D-5) THEN
+ COF=P1(1)/(SID*PTOT1)
+ SIF=P1(2)/(SID*PTOT1)
+ ANORF=SQRT(COF*COF+SIF*SIF)
+ COF=COF/ANORF
+ SIF=SIF/ANORF
+ ENDIF
+
+C new CM momentum and energies (for masses XM1,XM2)
+ XM12 = XM1**2
+ XM22 = XM2**2
+ SS = XMS**2
+ PCMP = PO_XLAM(SS,XM12,XM22)/(2.D0*XMS)
+ EE1 = SQRT(XM12+PCMP**2)
+ EE2 = XMS-EE1
+C back rotation
+ CALL PO_TRANS(0.D0,0.D0,PCMP,COD,SID,COF,SIF,XX,YY,ZZ)
+ CALL PO_ALTRA(GAM,BGX,BGY,BGZ,XX,YY,ZZ,EE1,
+ & PTOT1,P1(1),P1(2),P1(3),P1(4))
+ CALL PO_ALTRA(GAM,BGX,BGY,BGZ,-XX,-YY,-ZZ,EE2,
+ & PTOT2,P2(1),P2(2),P2(3),P2(4))
+
+ END
+
+
+ DOUBLE PRECISION FUNCTION PO_XLAM(X,Y,Z)
+C**********************************************************************
+C
+C auxiliary function for two/three particle decay mode
+C (standard LAMBDA**(1/2) function)
+C
+C (taken from PHOJET 1.12, R.E. 08/98)
+C
+C**********************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ SAVE
+
+ YZ=Y-Z
+ XLAM=X*X-2.D0*X*(Y+Z)+YZ*YZ
+ IF(XLAM.LT.0.D0) XLAM=-XLAM
+ PO_XLAM=SQRT(XLAM)
+
+ END
+
+
+
+ SUBROUTINE INITIAL(L0)
+
+c*******************************************************************
+c initialization routine for setting parameters of resonances
+c*******************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ SAVE
+ COMMON /RES_PROP/ AMRES(9),SIG0(9),WIDTH(9),
+ + NAMPRES(0:9)
+ COMMON /RES_PROPp/ AMRESp(9), BGAMMAp(9),WIDTHp(9),
+ + RATIOJp(9),NAMPRESp(0:9)
+ COMMON /RES_PROPn/ AMRESn(9), BGAMMAn(9),WIDTHn(9),
+ + RATIOJn(9),NAMPRESn(0:9)
+ COMMON /SO_MASS1/ AM(49), AM2(49)
+ CHARACTER NAMPRESp*6, NAMPRESn*6
+ CHARACTER NAMPRES*6
+
+ if (L0.eq.13) then
+ do i=1,9
+ SIG0(i) = 4.893089117D0/AM2(13)*RATIOJp(i)*BGAMMAp(i)
+ AMRES(i) = AMRESp(i)
+ WIDTH(i) = WIDTHp(i)
+ NAMPRES(i) = NAMPRESp(i)
+ enddo
+ endif
+
+ if (L0.eq.14) then
+ do i=1,9
+ SIG0(i) = 4.893089117D0/AM2(14)*RATIOJn(i)*BGAMMAn(i)
+ AMRES(i) = AMRESn(i)
+ WIDTH(i) = WIDTHn(i)
+ NAMPRES(i) = NAMPRESn(i)
+ enddo
+ endif
+
+ RETURN
+ END
diff --git a/modules/sophia/eventgen.f.orig b/modules/sophia/eventgen.f.orig
new file mode 100644
index 0000000000000000000000000000000000000000..bb030dbc63f8e39c2f871e7e5d7bfa41b1bb64f5
--- /dev/null
+++ b/modules/sophia/eventgen.f.orig
@@ -0,0 +1,3324 @@
+c*****************************************************************************
+c**!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!***
+c**!! IF YOU USE THIS PROGRAM, PLEASE CITE: !!***
+c**!! A.M"ucke, Ralph Engel, J.P.Rachen, R.J.Protheroe and Todor Stanev, !!***
+c**!! 1999, astro-ph/9903478, to appear in Comp.Phys.Commun. !!***
+c**!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!***
+c*****************************************************************************
+c** Further SOPHIA related papers: ***
+c** (1) M"ucke A., et al 1999, astro-ph/9808279, to appear in PASA. ***
+c** (2) M"ucke A., et al 1999, to appear in: Proc. of the ***
+c** 19th Texas Symposium on Relativistic Astrophysics, Paris, France, ***
+c** Dec. 1998. Eds.: J.~Paul, T.~Montmerle \& E.~Aubourg (CEA Saclay) ***
+c** (3) M"ucke A., et al 1999, astro-ph/9905153, to appear in: Proc. of ***
+c** 19th Texas Symposium on Relativistic Astrophysics, Paris, France, ***
+c** Dec. 1998. Eds.: J.~Paul, T.~Montmerle \& E.~Aubourg (CEA Saclay) ***
+c** (4) M"ucke A., et al 1999, to appear in: Proc. of 26th Int.Cosmic Ray ***
+c** Conf. (Salt Lake City, Utah) ***
+c*****************************************************************************
+
+
+ subroutine eventgen(L0,E0,eps,theta,Imode)
+
+c*******************************************************
+c** subroutine for photopion production of **
+c** relativistic nucleons in a soft photon field **
+c** subroutine for SOPHIA Version 1.2 **
+c****** INPUT ******************************************
+c E0 = energy of incident proton (in lab frame) [in GeV]
+c eps = energy of incident photon [in GeV] (in lab frame)
+c theta = angle between incident proton and photon [in degrees]
+c L0 = code number of the incident nucleon
+c****** OUTPUT *************************************************
+c P(2000,5) = 5-momentum of produced particles
+c LLIST(2000) = code numbers of produced particles
+c NP = number of produced particles
+c***************************************************************
+c** Date: 20/01/98 **
+c** correct.:19/02/98 **
+c** change: 23/05/98 **
+c** last change:06/09/98 **
+c** authors: A.Muecke **
+c** R.Engel **
+c**************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ SAVE
+
+ COMMON /S_RUN/ SQS, S, Q2MIN, XMIN, ZMIN, kb, kt, a1, a2, Nproc
+ COMMON /S_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+ COMMON /S_MASS1/ AM(49), AM2(49)
+ COMMON /S_CHP/ S_LIFE(49), ICHP(49), ISTR(49), IBAR(49)
+ COMMON /S_CSYDEC/ CBR(102), IDB(49), KDEC(612), LBARP(49)
+
+ CHARACTER NAMPRES*6
+ COMMON /RES_PROP/ AMRES(9), SIG0(9),WIDTH(9),
+ + NAMPRES(0:9)
+
+ CHARACTER NAMPRESp*6
+ COMMON /RES_PROPp/ AMRESp(9), BGAMMAp(9),WIDTHp(9),
+ + RATIOJp(9),NAMPRESp(0:9)
+
+ CHARACTER NAMPRESn*6
+ COMMON /RES_PROPn/ AMRESn(9), BGAMMAn(9),WIDTHn(9),
+ + RATIOJn(9),NAMPRESn(0:9)
+
+ INTEGER KSEQ
+ PARAMETER (KSEQ = 8)
+ DOUBLE PRECISION C(KSEQ),U(97,KSEQ),UNI
+ INTEGER IJKL(KSEQ),I97(KSEQ),J97(KSEQ),
+ * NTOT(KSEQ),NTOT2(KSEQ),JSEQ
+ COMMON /CRRANMA4/C,U,IJKL,I97,J97,NTOT,NTOT2,JSEQ
+
+ DOUBLE PRECISION P_nuc(4),P_gam(4),P_sum(4),PC(4),GamBet(4)
+
+
+
+ DATA pi /3.141593D0/
+ DATA IRESMAX /9/
+ DATA Icount / 0 /
+
+c****** INPUT **************************************************
+c E0 = energy of incident proton (in lab frame) [in GeV]
+c eps = energy of incident photon [in GeV] (in lab frame)
+c theta = angle between incident proton and photon [in degrees]
+c L0 = code number of the incident nucleon
+c***************************************************************
+c** calculate eps_prime = photon energy in nuclear rest frame,
+c** sqrt(s) = CMF energy of the N\gamma-system
+
+c... declare stable particles:
+
+C muons stable
+c IDB(4) = -ABS(IDB(4))
+c IDB(5) = -ABS(IDB(5))
+C
+C pi+,pi0,pi- stable
+c IDB(6) = -ABS(IDB(6))
+c IDB(7) = -ABS(IDB(7))
+c IDB(8) = -ABS(IDB(8))
+C
+C Deltas stable
+C IDB(40) = -ABS(IDB(40))
+C IDB(41) = -ABS(IDB(41))
+C IDB(42) = -ABS(IDB(42))
+C IDB(43) = -ABS(IDB(43))
+C rho, omega, phi stable
+C IDB(25) = -ABS(IDB(25))
+C IDB(26) = -ABS(IDB(26))
+C IDB(27) = -ABS(IDB(27))
+C IDB(32) = -ABS(IDB(32))
+C IDB(33) = -ABS(IDB(33))
+C print *,' WARNING: Deltas, eta, VMs are stable in this version'
+
+C rho0,omega stable
+c IDB(27) = -ABS(IDB(27))
+c IDB(32) = -ABS(IDB(32))
+
+C STRANGE PARTICLES:
+C kaons stable
+c IDB(9) = -ABS(IDB(9))
+c IDB(10) = -ABS(IDB(10))
+
+C IDB(11) = -ABS(IDB(11))
+C IDB(12) = -ABS(IDB(12))
+C IDB(21) = -ABS(IDB(21))
+C IDB(22) = -ABS(IDB(22))
+C kaons* stable
+c IDB(28) = -ABS(IDB(28))
+c IDB(29) = -ABS(IDB(29))
+c IDB(30) = -ABS(IDB(30))
+c IDB(31) = -ABS(IDB(31))
+
+C eta stable
+C IDB(23) = -ABS(IDB(23))
+
+C**anfe 2016/01/20 Initialize the non-default RMMARD
+C** random number generator with default
+C** seed, if necessary
+ if (.not.(U(1,1).gt.0D0)) Call INIT_RMMARD(12345)
+C incoming nucleon
+ pm = AM(L0)
+ P_nuc(1) = 0.D0
+ P_nuc(2) = 0.D0
+ P_nuc(3) = SQRT(MAX((E0-pm)*(E0+pm),0.D0))
+ P_nuc(4) = E0
+C incoming photon
+ P_gam(1) = EPS*SIN(theta*pi/180.D0)
+ P_gam(2) = 0.D0
+ P_gam(3) = -EPS*COS(theta*pi/180.D0)
+ P_gam(4) = EPS
+
+ Esum = P_nuc(4)+P_gam(4)
+ PXsum = P_nuc(1)+P_gam(1)
+ PYsum = P_nuc(2)+P_gam(2)
+ PZsum = P_nuc(3)+P_gam(3)
+ IQchr = ICHP(1)+ICHP(L0)
+ IQbar = IBAR(1)+IBAR(L0)
+
+ gammap = E0/pm
+ xx = 1.D0/gammap
+ if(gammap.gt.1000.D0) then
+ betap = 1.D0 - 0.5D0*xx**2 - 0.125D0*xx**4
+ else
+ betap = sqrt(1.D0-xx)*sqrt(1.D0+xx)
+ endif
+c Etot = E0+eps
+ s = pm*pm + 2.D0*eps*E0*(1.D0-betap*cos(theta*pi/180.D0))
+ sqsm = sqrt(s)
+ eps_prime = (s-pm*pm)/2.D0/pm
+
+C calculate Lorentz boots and rotation
+ P_sum(1) = P_nuc(1)+P_gam(1)
+ P_sum(2) = P_nuc(2)+P_gam(2)
+ P_sum(3) = P_nuc(3)+P_gam(3)
+ P_sum(4) = P_nuc(4)+P_gam(4)
+C Lorentz transformation into c.m. system
+ DO I=1,4
+ GamBet(I) = P_sum(I)/sqsm
+ ENDDO
+C calculate rotation angles
+ IF(GamBet(4).lt.1.d5) then
+C transform nucleon vector
+ GamBet(1) = -GamBet(1)
+ GamBet(2) = -GamBet(2)
+ GamBet(3) = -GamBet(3)
+ CALL PO_ALTRA(GamBet(4),GamBet(1),GamBet(2),GamBet(3),
+ & P_nuc(1),P_nuc(2),P_nuc(3),P_nuc(4),Ptot,
+ & PC(1),PC(2),PC(3),PC(4))
+ GamBet(1) = -GamBet(1)
+ GamBet(2) = -GamBet(2)
+ GamBet(3) = -GamBet(3)
+C rotation angle: nucleon moves along +z
+ COD = PC(3)/Ptot
+ SID = SQRT(PC(1)**2+PC(2)**2)/Ptot
+ COF = 1.D0
+ SIF = 0.D0
+ IF(Ptot*SID.GT.1.D-5) THEN
+ COF=PC(1)/(SID*Ptot)
+ SIF=PC(2)/(SID*Ptot)
+ Anorf=SQRT(COF*COF+SIF*SIF)
+ COF=COF/Anorf
+ SIF=SIF/Anorf
+ ENDIF
+ else
+ COD = 1.D0
+ SID = 0.D0
+ COF = 1.D0
+ SIF = 0.D0
+ endif
+
+c... check for threshold:
+ sth = 1.1646D0
+ if (s.lt.sth) then
+ print*,'input energy below threshold for photopion production !'
+ print*,'sqrt(s) = ',sqrt(s)
+ NP = 0
+ RETURN
+ endif
+
+ 200 continue
+ Icount = Icount+1
+ Imode = 0
+
+c*******************************************************************
+c decide which process occurs: ***
+c (1) decay of resonance ***
+c (2) direct pion production (interaction of photon with ***
+c virtual pions in nucleon cloud) and diffractive scattering ***
+c (3) multipion production ***
+c*******************************************************************
+
+ call dec_inter3(eps_prime,Imode,L0)
+
+c*********************************************
+c******* PARTICLE PRODUCTION *****************
+c*********************************************
+c 42 continue
+ if (Imode.le.5) then
+c... direct/multipion/diffractive scattering production channel:
+ call GAMMA_H(sqsm,L0,Imode,Ifbad)
+ if(Ifbad.ne.0) then
+ print *,' eventgen: simulation of particle production failed'
+ goto 200
+ endif
+ else if (Imode.eq.6) then
+c... Resonances:
+c... decide which resonance decays with ID=IRES in list:
+c... IRESMAX = number of considered resonances = 9 so far
+ IRES = 0
+ 46 call dec_res2(eps_prime,IRES,IRESMAX,L0)
+ Nproc = 10+IRES
+ call dec_proc2(eps_prime,IPROC,IRANGE,IRES,L0)
+c 2-particle decay of resonance in CM system:
+ NP = 2
+ call res_decay3(IRES,IPROC,IRANGE,s,L0,nbad)
+ if (nbad.eq.1) then
+ print *,' eventgen: event rejected by res_decay3'
+ goto 46
+ endif
+ call DECSIB
+ else
+ print*,'invalid Imode !!'
+ STOP
+ endif
+
+c... consider only stable particles:
+ 18 istable=0
+ do 16 i=1,NP
+ if (abs(LLIST(i)).lt.10000) then
+ istable = istable+1
+ LLIST(istable) = LLIST(i)
+ P(istable,1) = P(i,1)
+ P(istable,2) = P(i,2)
+ P(istable,3) = P(i,3)
+ P(istable,4) = P(i,4)
+ P(istable,5) = P(i,5)
+ endif
+ 16 continue
+ if (NP.gt.istable) then
+ do i=istable+1,NP
+ LLIST(i) = 0
+ P(i,1) = 0.
+ P(i,2) = 0.
+ P(i,3) = 0.
+ P(i,4) = 0.
+ P(i,5) = 0.
+ enddo
+ endif
+ NP = istable
+
+c***********************************************
+c transformation from CM-system to lab-system: *
+c***********************************************
+
+ DO I=1,NP
+ CALL PO_TRANS(P(I,1),P(I,2),P(I,3),COD,SID,COF,SIF,
+ & PC(1),PC(2),PC(3))
+ PC(4) = P(I,4)
+ CALL PO_ALTRA(GamBet(4),GamBet(1),GamBet(2),GamBet(3),
+ & PC(1),PC(2),PC(3),PC(4),Ptot,
+ & P(I,1),P(I,2),P(I,3),P(I,4))
+ ENDDO
+
+c call check_event(Icount,Esum,PXsum,PYsum,PZsum,IQchr,IQbar,Irej)
+c if(Irej.ne.0) then
+c print *,' eventgen: event rejected by check_event'
+c goto 200
+c endif
+
+ return
+
+ END
+
+
+c*****************************
+c*** List of SUBROUTINES *****
+C*****************************
+
+ DOUBLE PRECISION function crossection(x,NDIR,NL0)
+
+ IMPLICIT DOUBLE PRECISION (A-M,O-Z)
+ IMPLICIT INTEGER (N)
+
+ SAVE
+
+ CHARACTER NAMPRES*6
+ COMMON /RES_PROP/ AMRES(9), SIG0(9),WIDTH(9),
+ + NAMPRES(0:9)
+ COMMON /S_MASS1/ AM(49), AM2(49)
+
+ DIMENSION sig_res(9)
+
+ external breitwigner, Ef, singleback, twoback
+
+ DATA sth /1.1646D0/
+
+c*****************************************************
+C calculates crossection of N-gamma-interaction
+C (see thesis of J.Rachen, p.45ff and corrections
+C report from 27/04/98, 5/05/98, 22/05/98 of J.Rachen)
+C*****************************************************
+c** Date: 20/01/98 **
+c** correct.:27/04/98**
+c** update: 23/05/98 **
+c** author: A.Muecke **
+c**********************
+c
+c x = eps_prime in GeV
+ pm = AM(NL0)
+ s = pm*pm+2.D0*pm*x
+
+ if (s.lt.sth) then
+ crossection = 0.
+ RETURN
+ endif
+ if (x.gt.10.D0) then
+c only multipion production:
+ cross_res = 0.D0
+ cross_dir = 0.D0
+ cross_dir1 = 0.D0
+ cross_dir2 = 0.D0
+ goto 10
+ endif
+
+c****************************
+c RESONANCES:
+c****************************
+
+ cross_res = 0.D0
+
+ cross_res = breitwigner(SIG0(1),WIDTH(1),AMRES(1),x)
+ & *Ef(x,0.152D0,0.17D0)
+ sig_res(1) = cross_res
+ DO N=2,9
+
+ sig_res(N) = breitwigner(SIG0(N),WIDTH(N),AMRES(N),x)
+ & *Ef(x,0.15D0,0.38D0)
+ cross_res = cross_res + sig_res(N)
+
+ ENDDO
+
+c****************************
+c DIRECT CHANNEL:
+c****************************
+
+ if((x.gt.0.1D0).and.(x.lt.0.6D0)) then
+ cross_dir1 = singleback(x)
+ & + 40.D0*exp(-(x-0.29D0)**2/0.002D0)
+ & - 15.D0*exp(-(x-0.37D0)**2/0.002D0)
+ else
+ cross_dir1 = singleback(x)
+ endif
+ cross_dir2 = twoback(x)
+
+ cross_dir = cross_dir1 + cross_dir2
+
+c****************************
+c FRAGMENTATION 2:
+c****************************
+ 10 continue
+ if (NL0.eq.13) then
+ cross_frag2 = 80.3D0*Ef(x,0.5D0,0.1D0)*(s**(-0.34D0))
+ else if (NL0.eq.14) then
+ cross_frag2 = 60.2D0*Ef(x,0.5D0,0.1D0)*(s**(-0.34D0))
+ endif
+
+c****************************************************
+c MULTIPION PRODUCTION/FRAGMENTATION 1 CROSS SECTION
+c****************************************************
+ if (x.gt.0.85D0) then
+ ss1 = (x-.85D0)/.69D0
+ if (NL0.eq.13) then
+ ss2 = 29.3D0*(s**(-.34D0))+59.3D0*(s**.095D0)
+ else if (NL0.eq.14) then
+ ss2 = 26.4D0*(s**(-.34D0))+59.3D0*(s**.095D0)
+ endif
+ cs_multidiff = (1.-exp(-ss1))*ss2
+ cs_multi = 0.89D0*cs_multidiff
+
+c****************************
+c DIFFRACTIVE SCATTERING:
+c****************************
+
+ cross_diffr1 = .099D0*cs_multidiff
+ cross_diffr2 = .011D0*cs_multidiff
+ cross_diffr = 0.11D0*cs_multidiff
+
+C***********************************************************************
+
+ ss1 = ((x-.85D0)**.75D0)/.64D0
+ ss2 = 74.1D0*(x**(-.44D0))+62.D0*(s**.08D0)
+ cs_tmp = 0.96D0*(1.D0-exp(-ss1))*ss2
+ cross_diffr1 = 0.14D0*cs_tmp
+ cross_diffr2 = 0.013D0*cs_tmp
+ cs_delta = cross_frag2 - (cross_diffr1+cross_diffr2-cross_diffr)
+ if(cs_delta.lt.0.D0) then
+ cross_frag2 = 0.D0
+ cs_multi = cs_multi+cs_delta
+ else
+ cross_frag2 = cs_delta
+ endif
+ cross_diffr = cross_diffr1 + cross_diffr2
+ cs_multidiff = cs_multi + cross_diffr
+
+C***********************************************************************
+
+
+ else
+ cross_diffr = 0.D0
+ cross_diffr1 = 0.D0
+ cross_diffr2 = 0.D0
+ cs_multidiff = 0.D0
+ cs_multi = 0.D0
+ endif
+
+ if (NDIR.eq.3) then
+
+ crossection = cross_res+cross_dir+cs_multidiff+cross_frag2
+ RETURN
+
+ else if (NDIR.eq.0) then
+
+ crossection = cross_res+cross_dir+cross_diffr+cross_frag2
+ RETURN
+
+ else if (NDIR.eq.2) then
+
+ crossection = cross_res+cross_dir
+ RETURN
+
+ else if (NDIR.eq.1) then
+
+ crossection = cross_res
+ RETURN
+
+ else if (NDIR.eq.4) then
+
+ crossection = cross_dir
+ RETURN
+
+ else if (NDIR.eq.5) then
+
+ crossection = cs_multi
+ RETURN
+
+ else if (NDIR.eq.6) then
+
+ crossection = cross_res+cross_dir2
+ RETURN
+
+ else if (NDIR.eq.7) then
+
+ crossection = cross_res+cross_dir1
+ RETURN
+
+ else if (NDIR.eq.8) then
+
+ crossection = cross_res+cross_dir+cross_diffr1
+ RETURN
+
+ else if (NDIR.eq.9) then
+
+ crossection = cross_res+cross_dir+cross_diffr
+ RETURN
+
+ else if (NDIR.eq.10) then
+
+ crossection = cross_diffr
+ RETURN
+
+ else if ((NDIR.ge.11).and.(NDIR.le.19)) then
+
+ crossection = sig_res(NDIR-10)
+ RETURN
+
+ else
+
+ print*,'wrong input NDIR in crossection.f !'
+ STOP
+
+ endif
+
+ END
+
+
+ DOUBLE PRECISION function breitwigner(sigma_0,Gamma,
+ & DMM,eps_prime)
+
+ IMPLICIT DOUBLE PRECISION (A-M,O-Z)
+ IMPLICIT INTEGER (N)
+
+ SAVE
+
+c***************************************************************************
+c calculates Breit-Wigner cross section of a resonance with width Gamma [GeV],
+c mass DMM [GeV], max. cross section sigma_0 [mubarn] and total mass of the
+c interaction s [GeV]
+c***************************************************************************
+ pm = 0.93827D0
+ s = pm*pm+2.D0*pm*eps_prime
+ gam2s = Gamma*Gamma*s
+ breitwigner = sigma_0
+ & *(s/eps_prime**2)*gam2s/((s-DMM*DMM)**2+gam2s)
+
+ RETURN
+
+ END
+
+
+ DOUBLE PRECISION function Pl(x,xth,xmax,alpha)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+ if (xth.gt.x) then
+ Pl = 0.
+ RETURN
+ endif
+
+ a = alpha*xmax/xth
+ prod1 = ((x-xth)/(xmax-xth))**(a-alpha)
+ prod2 = (x/xmax)**(-a)
+ Pl = prod1*prod2
+
+ END
+
+
+ DOUBLE PRECISION function Ef(x,th,w)
+
+ IMPLICIT DOUBLE PRECISION (A-M,O-Z)
+ IMPLICIT INTEGER (N)
+
+ SAVE
+
+ wth = w+th
+ if (x.le.th) then
+ Ef = 0.
+ RETURN
+ else if (x.gt.th.and.x.lt.wth) then
+ Ef = (x-th)/w
+ RETURN
+ else if (x.ge.wth) then
+ Ef = 1.
+ RETURN
+ else
+ print*,'error in function EF'
+ STOP
+ endif
+
+ END
+
+
+
+ subroutine dec_inter3(eps_prime,Imode,L0)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+
+ DOUBLE PRECISION RNDM
+ external RNDM
+
+c*** decides which process takes place at eps_prime ********
+c (6) excitation/decay of resonance ***
+c (2) direct pion production: N\gamma --> N \pi ***
+c (3) direct pion production: N\gamma --> \Delta \pi ***
+c (1) diffractive scattering: N\gamma --> N \rho ***
+c (4) diffractive scattering: N\gamma --> N \omega ***
+c (0) multipion production (fragmentation) ***
+c (5) fragmentation in resonance region ***
+c***********************************************************
+c** Date: 15/04/98 **
+c** author: A.Muecke **
+c**********************
+ tot = crossection(eps_prime,3,L0)
+ if (tot.eq.0.) tot = 1.D0
+ prob1 = crossection(eps_prime,1,L0)/tot
+ prob2 = crossection(eps_prime,7,L0)/tot
+ prob3 = crossection(eps_prime,2,L0)/tot
+ prob4 = crossection(eps_prime,8,L0)/tot
+ prob5 = crossection(eps_prime,9,L0)/tot
+ prob6 = crossection(eps_prime,0,L0)/tot
+ prob7 = 1.D0
+ rn = RNDM(0)
+
+ if (rn.lt.prob1) then
+ Imode = 6
+c ... --> resonance decay
+ RETURN
+ else if (prob1.le.rn.and.rn.lt.prob2) then
+ Imode = 2
+c ... --> direct channel: N\gamma --> N\pi
+ RETURN
+ else if (prob2.le.rn.and.rn.lt.prob3) then
+ Imode = 3
+c ... --> direct channel: N\gamma --> \Delta \pi
+ RETURN
+ else if (prob3.le.rn.and.rn.lt.prob4) then
+ Imode = 1
+c ... --> diffractive scattering: N\gamma --> N \rho
+ RETURN
+ else if (prob4.le.rn.and.rn.lt.prob5) then
+ Imode = 4
+c ... --> diffractive scattering: N\gamma --> N \omega
+ RETURN
+ else if (prob5.le.rn.and.rn.lt.prob6) then
+ Imode = 5
+c ... --> fragmentation (2) in resonance region
+ return
+ else if (prob6.le.rn.and.rn.lt.1.D0) then
+ Imode = 0
+c ... --> fragmentation mode/multipion production
+ RETURN
+ else if (rn.eq.1.D0) then
+ Imode = 0
+ RETURN
+ else
+ print*,'error in dec_inter.f !'
+ STOP
+ endif
+
+ END
+
+
+ SUBROUTINE PROC_TWOPART(LA,LB,AMD,Lres,Pres,costheta,nbad)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON /S_MASS1/ AM(49), AM2(49)
+ COMMON /RES_FLAG/ FRES(49),XLIMRES(49)
+ SAVE
+ DIMENSION Pres(2000,5),Lres(2000)
+
+c***********************************************************
+c 2-particle decay of CMF mass AMD INTO M1 + M2
+C NUCLEON ENERGY E0 [in GeV];
+C E1,E2 [in GeV] are energies of decay products
+c LA,LB are code numbers of decay products
+c P1(1:5),P2(1:5) are 5-momenta of particles LA,LB;
+c resulting momenta are calculated in CM frame;
+c costheta is cos of scattering angle in CM frame
+c this program also checks if the resulting particles are
+c resonances; if yes, it is also allowed to decay a
+c mass AMD < M1 + M2 by using the width of the resonance(s)
+c***********************************************************
+c** Date: 20/01/98 **
+c** correct.:19/02/98**
+c** author: A.Muecke **
+c**********************
+
+ nbad = 0
+ SM1 = AM(LA)
+ if (LB.eq.0) then
+ SM2 = 2.D0*AM(7)
+ else
+ SM2 = AM(LB)
+ endif
+ E1 = (AMD*AMD + SM1*SM1 - SM2*SM2)/AMD/2.D0
+ E2 = (AMD*AMD + SM2*SM2 - SM1*SM1)/AMD/2.D0
+c... check if SM1+SM2 < AMD:
+ if ((SM1+SM2).gt.AMD) then
+c... if one of the decay products is a resonance, this 'problem' can
+c be solved by using a reduced mass for the resonance and assume that
+c this resonance is produced at its threshold;
+ if (FRES(LA).eq.1.D0) then
+c ... particle LA is a resonance:
+ SM1 = AMD-SM2
+ E1 = SM1
+ E2 = AMD-E1
+ if (E1.lt.XLIMRES(LA).or.E2.lt.XLIMRES(LB)) nbad = 1
+ endif
+ if (FRES(LB).eq.1.D0) then
+c ... particle LB is a resonance:
+ SM2 = AMD-SM1
+ E2 = SM2
+ E1 = AMD-E2
+ if (E1.lt.XLIMRES(LA).or.E2.lt.XLIMRES(LB)) nbad = 1
+ endif
+c ... both particles are NOT resonances: -> error !
+ if (FRES(LA).eq.0.D0.and.FRES(LB).eq.0.D0) then
+ print*,'SM1 + SM2 > AMD in PROC_TWOPART',SM1,SM2,AMD,LA,LB
+ STOP
+ endif
+ endif
+
+ if (nbad.eq.0) then
+ PC = SQRT((E1*E1 - SM1*SM1))
+ Pres(1,4) = E1
+ Pres(2,4) = E2
+ Pres(1,5) = SM1
+ Pres(2,5) = SM2
+
+
+C *********************************************************
+c theta is scattering angle in CM frame:
+ r = RNDM(0)
+ P1Z= PC*costheta
+ P2Z=-PC*costheta
+
+ P1X = sqrt(r*(PC*PC-P1Z*P1Z))
+ P2X = sqrt(r*(PC*PC-P2Z*P2Z))
+ P1Y = sqrt((1.D0-r)*(PC*PC-P1Z*P1Z))
+ P2Y = sqrt((1.D0-r)*(PC*PC-P2Z*P2Z))
+ if(RNDM(0).lt.0.5D0) then
+ P1X = -P1X
+ else
+ P2X = -P2X
+ endif
+ if(RNDM(0).lt.0.5D0) then
+ P1Y = -P1Y
+ else
+ P2Y = -P2Y
+ endif
+
+ Pres(1,1) = P1X
+ Pres(1,2) = P1Y
+ Pres(1,3) = P1Z
+ Pres(2,1) = P2X
+ Pres(2,2) = P2Y
+ Pres(2,3) = P2Z
+ Lres(1) = LA
+ Lres(2) = LB
+ endif
+
+ RETURN
+
+ END
+
+
+ subroutine dec_res2(eps_prime,IRES,IRESMAX,L0)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+c*****************************************************************************
+c*** decides which resonance with ID=IRES in list takes place at eps_prime ***
+c*****************************************************************************
+c** Date: 20/01/98 **
+c** author: A.Muecke **
+c**********************
+
+ DIMENSION prob_sum(9)
+
+
+c*** sum of all resonances:
+ sumres = 0.D0
+ do 12 j=1,IRESMAX
+ j10 = j+10
+ sumres = sumres+crossection(eps_prime,j10,L0)
+ prob_sum(j) = sumres
+ 12 continue
+
+
+ r = RNDM(0)
+
+ IRES = 0
+ i = 0
+ prob = 0.D0
+ 10 continue
+ i = i+1
+ probold = prob
+ prob = prob_sum(i)/sumres
+ if (r.ge.probold.and.r.lt.prob) then
+ IRES = i
+ RETURN
+ endif
+ if (i.lt.IRESMAX) goto 10
+ if (r.eq.1.D0) IRES = i
+ if (IRES.eq.0) then
+ print*,'no resonance possible !'
+ STOP
+ endif
+
+ RETURN
+
+ END
+
+
+ subroutine dec_proc2(x,IPROC,IRANGE,IRES,L0)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+c**********************************************************************
+c*** decide which decay with ID=IPROC of resonance IRES takes place ***
+c**********************************************************************
+c** Date: 20/01/98 **
+c** correct.: 27/04/98*
+c** author: A.Muecke **
+c**********************
+
+ COMMON /S_RESp/ CBRRES1p(18),CBRRES2p(36),CBRRES3p(26),
+ + RESLIMp(36),ELIMITSp(9),KDECRES1p(90),KDECRES2p(180),
+ + KDECRES3p(130),IDBRES1p(9),IDBRES2p(9),IDBRES3p(9)
+ COMMON /S_RESn/ CBRRES1n(18),CBRRES2n(36),CBRRES3n(22),
+ + RESLIMn(36),ELIMITSn(9),KDECRES1n(90),KDECRES2n(180),
+ + KDECRES3n(110),IDBRES1n(9),IDBRES2n(9),IDBRES3n(9)
+ DIMENSION prob_sum(0:9)
+
+c x = eps_prime
+c ... choose arrays /S_RESp/ for charged resonances,
+c ... arrays /S_RESn/ for neutral resonances
+ if (L0.eq.13) then
+c ... charged resonances:
+
+ r = RNDM(0)
+c... determine the energy range of the resonance:
+ nlim = ELIMITSp(IRES)
+ istart = (IRES-1)*4+1
+ if (nlim.gt.0) then
+ do ie=istart,nlim-2+istart
+ reslimp1 = RESLIMp(ie)
+ reslimp2 = RESLIMp(ie+1)
+ if (x.le.reslimp2.and.x.gt.reslimp1) then
+ IRANGE = ie+1-istart
+ endif
+ enddo
+ else
+ irange = 1
+ 13 endif
+
+
+
+ IPROC = -1
+ i = 0
+ prob_sum(0) = 0.D0
+
+ if (IRANGE.eq.1) then
+ j = IDBRES1p(IRES)-1
+ if (j.eq.-1) then
+ print*,'invalid resonance in energy range 1'
+ endif
+ 10 continue
+ j = j+1
+ i = i+1
+ prob_sum(i) = CBRRES1p(j)
+ if (r.ge.prob_sum(i-1).and.r.lt.prob_sum(i)) then
+ IPROC = j
+ endif
+ if (prob_sum(i).lt.1.D0) goto 10
+ if (r.eq.1.D0) IPROC = j
+ if (IPROC.eq.-1) then
+ print*,'no resonance decay possible !'
+ endif
+
+ else if (IRANGE.eq.2) then
+ j = IDBRES2p(IRES)-1
+ if (j.eq.-1) then
+ print*,'invalid resonance in energy range 2'
+ endif
+ 11 continue
+ j = j+1
+ i = i+1
+ prob_sum(i) = CBRRES2p(j)
+ if (r.ge.prob_sum(i-1).and.r.lt.prob_sum(i)) then
+ IPROC = j
+ endif
+ if (prob_sum(i).lt.1.D0) goto 11
+ if (r.eq.1.D0) IPROC = j
+ if (IPROC.eq.-1) then
+ print*,'no resonance decay possible !'
+ endif
+
+ else if (IRANGE.eq.3) then
+ j = IDBRES3p(IRES)-1
+ if (j.eq.-1) then
+ print*,'invalid resonance in energy range 3'
+ endif
+ 12 continue
+ j = j+1
+ i = i+1
+ prob_sum(i) = CBRRES3p(j)
+ if (r.ge.prob_sum(i-1).and.r.lt.prob_sum(i)) then
+ IPROC = j
+ endif
+ if (prob_sum(i).lt.1.D0) goto 12
+ if (r.eq.1.D0) IPROC = j
+ if (IPROC.eq.-1) then
+ print*,'no resonance decay possible !'
+ endif
+
+ else
+ print*,'invalid IRANGE in DEC_PROC2'
+ endif
+
+ RETURN
+
+
+ else if (L0.eq.14) then
+c ... neutral resonances:
+
+ r = RNDM(0)
+c... determine the energy range of the resonance:
+ nlim = ELIMITSn(IRES)
+ istart = (IRES-1)*4+1
+ if (nlim.gt.0) then
+ do ie=istart,nlim-2+istart
+ if (x.le.RESLIMn(ie+1).and.x.gt.RESLIMn(ie)) then
+ IRANGE = ie+1-istart
+ endif
+ enddo
+ else
+ irange = 1
+ endif
+
+
+ IPROC = -1
+ i = 0
+ prob_sum(0) = 0.D0
+
+ if (IRANGE.eq.1) then
+ j = IDBRES1n(IRES)-1
+ if (j.eq.-1) then
+ print*,'invalid resonance in this energy range'
+ endif
+ 20 continue
+ j = j+1
+ i = i+1
+ prob_sum(i) = CBRRES1n(j)
+ if (r.ge.prob_sum(i-1).and.r.lt.prob_sum(i)) then
+ IPROC = j
+ endif
+ if (prob_sum(i).lt.1.D0) goto 20
+ if (r.eq.1.D0) IPROC = j
+ if (IPROC.eq.-1) then
+ print*,'no resonance decay possible !'
+ endif
+
+ else if (IRANGE.eq.2) then
+ j = IDBRES2n(IRES)-1
+ if (j.eq.-1) then
+ print*,'invalid resonance in this energy range'
+ endif
+ 21 continue
+ j = j+1
+ i = i+1
+ prob_sum(i) = CBRRES2n(j)
+ if (r.ge.prob_sum(i-1).and.r.lt.prob_sum(i)) then
+ IPROC = j
+ endif
+ if (prob_sum(i).lt.1.D0) goto 21
+ if (r.eq.1.) IPROC = j
+ if (IPROC.eq.-1) then
+ print*,'no resonance decay possible !'
+ endif
+
+ else if (IRANGE.eq.3) then
+ j = IDBRES3n(IRES)-1
+ if (j.eq.-1) then
+ print*,'invalid resonance in this energy range'
+ endif
+ 22 continue
+ j = j+1
+ i = i+1
+ prob_sum(i) = CBRRES3n(j)
+ if (r.ge.prob_sum(i-1).and.r.lt.prob_sum(i)) then
+ IPROC = j
+ endif
+ if (prob_sum(i).lt.1.D0) goto 22
+ if (r.eq.1.D0) IPROC = j
+ if (IPROC.eq.-1) then
+ print*,'no resonance decay possible !'
+ endif
+
+ else
+ print*,'invalid IRANGE in DEC_PROC2'
+ endif
+
+ RETURN
+
+ else
+ print*,'no valid L0 in DEC_PROC !'
+ STOP
+ endif
+
+ END
+
+
+ SUBROUTINE RES_DECAY3(IRES,IPROC,IRANGE,s,L0,nbad)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+ COMMON /S_RESp/ CBRRES1p(18),CBRRES2p(36),CBRRES3p(26),
+ + RESLIMp(36),ELIMITSp(9),KDECRES1p(90),KDECRES2p(180),
+ + KDECRES3p(130),IDBRES1p(9),IDBRES2p(9),IDBRES3p(9)
+ COMMON /S_RESn/ CBRRES1n(18),CBRRES2n(36),CBRRES3n(22),
+ + RESLIMn(36),ELIMITSn(9),KDECRES1n(90),KDECRES2n(180),
+ + KDECRES3n(110),IDBRES1n(9),IDBRES2n(9),IDBRES3n(9)
+ COMMON /S_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+c COMMON /S_CNAM/ NAMP (0:49)
+c CHARACTER NAMP*6, NAMPRESp*6, NAMPRESn*6
+
+* external scatangle, proc_twopart
+
+c********************************************************
+c RESONANCE AMD with code number IRES INTO M1 + M2
+C PROTON ENERGY E0 [in GeV] IN DMM [in GeV]
+C E1,E2 [in GeV] are energies of decay products
+c LA,LB are code numbers of decay products
+c P(1,1:5),P(2,1:5) are 5-momenta of particles LA,LB;
+c resulting momenta are calculated in CM frame;
+c ANGLESCAT is cos of scattering angle in CM frame
+c********************************************************
+c** Date: 20/01/98 **
+c** correct.:28/04/98**
+c** author: A.Muecke **
+c**********************
+
+c... determine decay products LA, LB:
+ NP = 2
+ if (L0.eq.13) then
+c ... proton is incident nucleon:
+ if (IRANGE.eq.1) then
+ LA = KDECRES1p(5*(IPROC-1)+3)
+ LB = KDECRES1p(5*(IPROC-1)+4)
+ else if (IRANGE.eq.2) then
+ LA = KDECRES2p(5*(IPROC-1)+3)
+ LB = KDECRES2p(5*(IPROC-1)+4)
+ else if (IRANGE.eq.3) then
+ LA = KDECRES3p(5*(IPROC-1)+3)
+ LB = KDECRES3p(5*(IPROC-1)+4)
+ else
+ print*,'error in res_decay3'
+ endif
+ else if (L0.eq.14) then
+c ... neutron is incident nucleon:
+ if (IRANGE.eq.1) then
+ LA = KDECRES1n(5*(IPROC-1)+3)
+ LB = KDECRES1n(5*(IPROC-1)+4)
+ else if (IRANGE.eq.2) then
+ LA = KDECRES2n(5*(IPROC-1)+3)
+ LB = KDECRES2n(5*(IPROC-1)+4)
+ else if (IRANGE.eq.3) then
+ LA = KDECRES3n(5*(IPROC-1)+3)
+ LB = KDECRES3n(5*(IPROC-1)+4)
+ else
+ print*,'error in res_decay3'
+ endif
+
+ else
+ print*,'no valid L0 in RES_DECAY'
+ STOP
+ endif
+
+ LLIST(1) = LA
+ LLIST(2) = LB
+
+c... sample scattering angle:
+ call scatangle(anglescat,IRES,L0)
+
+c ... 2-particle decay:
+ call proc_twopart(LA,LB,sqrt(s),LLIST,P,anglescat,nbad)
+
+ RETURN
+
+ END
+
+c***********************************************************
+C calculates functions for crossection of direct channel
+c NOT isospin-corrected, simply a samelsurium of functions
+c x is eps_prime in GeV (see main program)
+C (see thesis of J.Rachen, p.45ff)
+c note: neglect strange- and eta-channel
+C***********************************************************
+c** Date: 27/04/98 **
+c** last chg:23/05/98**
+c** author: A.Muecke **
+c**********************
+c
+
+ DOUBLE PRECISION FUNCTION singleback(x)
+c****************************
+c SINGLE PION CHANNEL
+c****************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+ singleback = 92.7D0*Pl(x,.152D0,.25D0,2.D0)
+
+ END
+
+
+ DOUBLE PRECISION FUNCTION twoback(x)
+c*****************************
+c TWO PION PRODUCTION
+c*****************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+ twoback = 37.7D0*Pl(x,.4D0,.6D0,2.D0)
+
+ END
+
+
+ subroutine scatangle(anglescat,IRES,L0)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+c*******************************************************************
+c This routine samples the cos of the scattering angle for a given *
+c resonance IRES and incident nucleon L0; it is exact for **
+c one-pion decay channel and if there is no **
+c other contribution to the cross section from another resonance **
+c and an approximation for an overlay of resonances; **
+c for decay channels other than the one-pion decay a isotropic **
+c distribution is used **
+c*******************************************************************
+c** Date: 16/02/98 **
+c** author: A.Muecke **
+c**********************
+
+ COMMON /S_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+
+c ... use rejection method for sampling:
+ LA = LLIST(1)
+ LB = LLIST(2)
+ 10 continue
+ r = RNDM(0)
+c*** sample anglescat random between -1 ... 1 **
+ anglescat = 2.D0*(r-0.5D0)
+c ... distribution is isotropic for other than one-pion decays:
+ if ((LA.eq.13.or.LA.eq.14).and.LB.ge.6.and.LB.le.8) then
+ prob = probangle(IRES,L0,anglescat)
+ else
+ prob = 0.5D0
+ endif
+ r = RNDM(0)
+ if (r.le.prob) then
+ RETURN
+ else
+ goto 10
+ endif
+ 12 continue
+
+ END
+
+ DOUBLE PRECISION function probangle(IRES,L0,z)
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+c********************************************************************
+c probability distribution for scattering angle of given resonance **
+c IRES and incident nucleon L0 ; **
+c z is cosine of scattering angle in CMF frame **
+c********************************************************************
+
+ if (IRES.eq.4.or.IRES.eq.5.or.IRES.eq.2) then
+c ... N1535 andf N1650 decay isotropically.
+ probangle = 0.5D0
+ return
+ endif
+
+ if (IRES.eq.1) then
+c ... for D1232:
+ probangle = 0.636263D0 - 0.408790D0*z*z
+ return
+ endif
+
+ if (IRES.eq.3.and.L0.eq.14) then
+c ... for N1520 and incident n:
+ probangle = 0.673669D0 - 0.521007D0*z*z
+ return
+ endif
+
+ if (IRES.eq.3.and.L0.eq.13) then
+c ... for N1520 and incident p:
+ probangle = 0.739763D0 - 0.719288D0*z*z
+ return
+ endif
+
+ if (IRES.eq.6.and.L0.eq.14) then
+c ... for N1680 (more precisely: N1675) and incident n:
+ q=z*z
+ probangle = 0.254005D0 + 1.427918D0*q - 1.149888D0*q*q
+ return
+ endif
+
+
+ if (IRES.eq.6.and.L0.eq.13) then
+c ... for N1680 and incident p:
+ q=z*z
+ probangle = 0.189855D0 + 2.582610D0*q - 2.753625D0*q*q
+ return
+ endif
+
+ if (IRES.eq.7) then
+c ... for D1700:
+ probangle = 0.450238D0 + 0.149285D0*z*z
+ return
+ endif
+
+
+ if (IRES.eq.8) then
+c ... for D1905:
+ q=z*z
+ probangle = 0.230034D0 + 1.859396D0*q - 1.749161D0*q*q
+ return
+ endif
+
+
+ if (IRES.eq.9) then
+c ... for D1950:
+ q=z*z
+ probangle = 0.397430D0 - 1.498240D0*q + 5.880814D0*q*q
+ & - 4.019252D0*q*q*q
+ return
+ endif
+
+ print*,'error in function probangle !'
+ STOP
+ END
+
+C->
+ DOUBLE PRECISION FUNCTION GAUSS (FUN, A,B)
+c*********************************************************
+C Returns the 8 points Gauss-Legendre integral
+C of function FUN from A to B
+c this routine was provided by T.Stanev
+c*********************************************************
+c** Date: 20/01/98 **
+c** A.Muecke **
+c**********************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+
+ EXTERNAL FUN
+
+C...........................................................
+ DIMENSION X(8), W(8)
+ DATA X /.0950125098D0,.2816035507D0,.4580167776D0,.6178762444D0
+ + ,.7554044083D0,.8656312023D0,.9445750230D0,.9894009349D0/
+ DATA W /.1894506104D0,.1826034150D0,.1691565193D0,.1495959888D0
+ + ,.1246289712D0,.0951585116D0,.0622535239D0, .0271524594D0/
+
+ XM = 0.5D0*(B+A)
+ XR = 0.5D0*(B-A)
+ SS = 0.D0
+ DO NJ=1,8
+ DX = XR*X(NJ)
+ SS = SS + W(NJ) * (FUN(XM+DX) + FUN(XM-DX))
+ ENDDO
+ GAUSS = XR*SS
+ RETURN
+ END
+
+
+
+
+
+C->
+c***************************
+c** last change: 12/10/98 **
+c** author: A.Muecke **
+c***************************
+ BLOCK DATA DATDEC
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+ COMMON /S_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+ COMMON /S_CSYDEC/ CBR(102), IDB(49), KDEC(612), LBARP(49)
+ COMMON /S_MASS1/ AM(49), AM2(49)
+ COMMON /S_CHP/ S_LIFE(49), ICHP(49), ISTR(49), IBAR(49)
+ COMMON /S_CNAM/ NAMP (0:49)
+
+ CHARACTER NAMPRESp*6
+ COMMON /RES_PROPp/ AMRESp(9), BGAMMAp(9),WIDTHp(9),
+ + RATIOJp(9),NAMPRESp(0:9)
+
+ CHARACTER NAMPRESn*6
+ COMMON /RES_PROPn/ AMRESn(9), BGAMMAn(9),WIDTHn(9),
+ + RATIOJn(9),NAMPRESn(0:9)
+
+ COMMON /S_RESp/ CBRRES1p(18),CBRRES2p(36),CBRRES3p(26),
+ + RESLIMp(36),ELIMITSp(9),KDECRES1p(90),KDECRES2p(180),
+ + KDECRES3p(130),IDBRES1p(9),IDBRES2p(9),IDBRES3p(9)
+ COMMON /S_RESn/ CBRRES1n(18),CBRRES2n(36),CBRRES3n(22),
+ + RESLIMn(36),ELIMITSn(9),KDECRES1n(90),KDECRES2n(180),
+ + KDECRES3n(110),IDBRES1n(9),IDBRES2n(9),IDBRES3n(9)
+ COMMON /RES_FLAG/ FRES(49),XLIMRES(49)
+ CHARACTER NAMP*6
+
+ DATA Ideb / 0 /
+
+ DATA FRES /0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ + 1,1,1,0,0,0,0,1,1,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,1/
+ DATA XLIMRES /0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.
+ + ,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,
+ + .275,.275,.28,0.,0.,0.,0.,.41,.9954,0.,0.,0.,0.,0.,0.,
+ + 1.078,1.08,1.078,1.08,0,0,0,0,0,1/
+ DATA AMRESp / 1.231,1.440,1.515,1.525,1.675,1.680,1.690,
+ + 1.895,1.950/
+ DATA AMRESn / 1.231,1.440,1.515,1.525,1.675,1.675,1.690,
+ + 1.895,1.950/
+ DATA IDBRES1p /
+ + 1,3,5,7,9,11,13,15,17/
+ DATA IDBRES2p /
+ + 0,1,6,11,14,19,24,27,32/
+ DATA IDBRES3p /
+ + 0,0,1,0,3,9,16,21,26/
+ DATA IDBRES1n /
+ + 1,3,5,7,9,11,13,15,17/
+ DATA IDBRES2n /
+ + 0,1,6,11,14,19,24,27,32/
+ DATA IDBRES3n /
+ + 0,0,1,0,3,0,9,14,19/
+
+ DATA CBRRES1p /
+ + .667,1.,.667,1.,.667,1.,.667,1.,.667,1.,.667,1.,.667,1.,
+ + .667,1.,.667,1./
+ DATA CBRRES1n /
+ + .667,1.,.667,1.,.667,1.,.667,1.,.667,1.,.667,1.,.667,1.,
+ + .667,1.,.667,1./
+C************************** settings of versions 1.4 - 2.0 *********
+ DATA CBRRES2p /
+ + .333,.5,.750,.917,1.,.333,.5,.75,.917,1.,.167,.25,1.,
+ + .567,.85,.925,.975,1.,.433,.65,.825,.942,1.,.4,.467,1.,
+ + .267,.4,.64,.68,1.,.4,.6,.76,.787,1./
+ DATA CBRRES2n /
+ + .333,.5,.750,.917,1.,.333,.5,.75,.917,1.,.167,.25,1.,
+ + .567,.85,.925,.975,1.,.267,.4,.7,.9,1.,.4,.467,1.,
+ + .267,.4,.64,.68,1.,.4,.6,.76,.787,1./
+ DATA CBRRES3p /
+ + .333,1.,.467,.7,.775,.825,.85,1.,.367,.55,.7,
+ + 1.,.08,.093,.2,.733,1.,.667,1.,
+ + .2,.3,.46,.487,.7,.9,1./
+ DATA CBRRES3n /
+ + .333,1.,.467,.7,.775,.825,.85,1.,
+ + .08,.093,.2,.733,1.,.667,1.,
+ + .2,.3,.46,.487,.7,.9,1./
+ DATA KDECRES1p /
+ + 2,0,13,6,0,2,0,14,7,0,2,0,14,7,0,2,0,13,6,0,2,0,14,7,0,
+ + 2,0,13,6,0,2,0,14,7,0,2,0,13,6,0,2,0,14,7,0,2,0,13,6,0,
+ + 2,0,14,7,0,2,0,13,6,0,2,0,13,6,0,2,0,14,7,0,2,0,13,6,0,
+ + 2,0,14,7,0,2,0,13,6,0,2,0,14,7,0/
+ DATA KDECRES2p /
+ + 2,0,14,7,0,2,0,13,6,0,2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,14,7,0,2,0,13,6,0,2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,14,7,0,2,0,13,6,0,2,0,13,23,0,2,0,14,7,0,2,0,13,6,0,
+ + 2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,14,7,0,2,0,13,6,0,2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,13,6,0,2,0,14,7,0,2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,13,6,0,2,0,14,7,0,2,0,40,8,0,2,0,41,6,0,2,0,42,7,0/
+ DATA KDECRES3p /
+ + 2,0,13,27,0,2,0,14,25,0,
+ + 2,0,14,7,0,2,0,13,6,0,2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,39,9,0,
+ + 2,0,14,7,0,2,0,13,6,0,
+ + 2,0,13,27,0,2,0,14,25,0,2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,
+ + 2,0,13,27,0,2,0,14,25,0,
+ + 2,0,13,27,0,2,0,14,25,0,
+ + 2,0,13,6,0,2,0,14,7,0,
+ + 2,0,40,8,0,2,0,41,6,0,2,0,42,7,0,2,0,13,27,0,2,0,14,25,0/
+ DATA KDECRES1n /
+ + 2,0,14,6,0,2,0,13,8,0,2,0,13,8,0,2,0,14,6,0,2,0,13,8,0,
+ + 2,0,14,6,0,2,0,13,8,0,2,0,14,6,0,2,0,13,8,0,2,0,14,6,0,
+ + 2,0,13,8,0,2,0,14,6,0,2,0,14,6,0,2,0,13,8,0,2,0,14,6,0,
+ + 2,0,13,8,0,2,0,14,6,0,2,0,13,8,0/
+ DATA KDECRES2n /
+ + 2,0,13,8,0,2,0,14,6,0,2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,13,8,0,2,0,14,6,0,2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,13,8,0,2,0,14,6,0,2,0,14,23,0,2,0,13,8,0,2,0,14,6,0,
+ + 2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,13,8,0,2,0,14,6,0,2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,14,6,0,2,0,13,8,0,2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,14,6,0,2,0,13,8,0,2,0,43,7,0,2,0,42,6,0,2,0,41,8,0/
+ DATA KDECRES3n /
+ + 2,0,14,27,0,2,0,13,26,0,
+ + 2,0,13,8,0,2,0,14,6,0,2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,39,21,0,
+ + 2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,
+ + 2,0,14,27,0,2,0,13,26,0,
+ + 2,0,14,27,0,2,0,13,26,0,
+ + 2,0,14,6,0,2,0,13,8,0,
+ + 2,0,43,7,0,2,0,42,6,0,2,0,41,8,0,2,0,14,27,0,2,0,13,26,0/
+ DATA RESLIMp /
+ + 0.,0.,0.,0.,0.,.54,10.,0.,0.,.54,1.09,10.,
+ + 0.,.71,10.,0.,0.,.54,.918,10.,
+ + 0.,.54,1.09,10.,0.,.54,1.09,10.,
+ + 0.,.54,1.09,10.,0.,.54,1.09,10./
+ DATA RESLIMn /
+ + 0.,.0,.0,.0,0.,.54,10.,0.,0.,.54,1.09,10.,
+ + 0.,.71,10.,0.,0.,.54,.918,10.,
+ + 0.,.54,10.,0.,0.,.54,1.09,10.,0.,.54,1.09,10.,
+ + 0.,.54,1.09,10./
+ DATA ELIMITSp /0,3,4,3,4,4,4,4,4/
+ DATA ELIMITSn /0,3,4,3,4,3,4,4,4/
+ DATA NAMPRESp /
+ + ' ','D+1232','N+1440','N+1520','N+1535','N+1650',
+ + 'N+1680','D+1700','D+1905','D+1950'/
+ DATA NAMPRESn /
+ + ' ','D01232','N01440','N01520','N01535','N01650',
+ + 'N01675','D01700','D01905','D01950'/
+ DATA BGAMMAp /
+ + 5.6,0.5,4.6,2.5,1.0,2.1,2.0,0.2,1.0/
+ DATA RATIOJp /
+ + 1.,0.5,1.,0.5,0.5,1.5,1.,1.5,2./
+ DATA WIDTHp /
+ + .11,.35,.11,.10,.16,.125,.29,.35,.3/
+ DATA BGAMMAn /
+ + 6.1,0.3,4.0,2.5,0.,0.2,2.0,0.2,1.0/
+ DATA RATIOJn /
+ + 1.,0.5,1.,0.5,0.5,1.5,1.,1.5,2./
+ DATA WIDTHn /
+ + .11,.35,.11,.10,.16,.15,.29,.35,.3/
+
+
+ DATA CBR /3*1.,0.,1.,1.,0.6351,0.8468,0.9027,0.9200,0.9518,1.,
+ + 0.6351,0.8468,0.9027,0.9200,0.9518,1.,0.2160,0.3398,0.4748,
+ + 0.6098,0.8049,1.,0.6861,1.,3*0.,0.5,1.,0.5,1.,
+ + 0.3890,0.7080,0.9440,0.9930,1.,0.,0.4420,0.6470,0.9470,0.9770,
+ + 0.9990,4*1.,0.6670,1.,9*0.,0.6670,1.,0.6670,1.,0.6670,1.,
+ + 0.8880,0.9730,1.,0.4950,0.8390,0.9870,1.,0.5160,5*1.,0.6410,1.,
+ + 1.,0.67,1.,0.33,1.,1.,0.88,0.94,1.,0.88,0.94,1.,0.88,0.94,1.,
+ + 0.33,1.,0.67,1.,0.678,0.914,1./
+ DATA AM / 0.,2*0.511E-3, 2*0.10566, 0.13497, 2*0.13957,
+ + 2*0.49365, 2*0.49767, 0.93827, 0.93957, 4*0.,0.93827,
+ + 0.93957, 2*0.49767, 0.54880,0.95750,2*0.76830,0.76860,
+ + 2*0.89183,2*0.89610,0.78195,1.01941,1.18937,1.19255,
+ + 1.19743,1.31490,1.32132,1.11563,1.23100,1.23500,
+ + 1.23400,1.23300,1.38280,1.38370,1.38720,
+ + 1.53180,1.53500,1.67243 /
+ DATA AM2 /0.,2*2.61121E-07,2*0.011164,0.018217,0.019480,
+ + 0.019480,0.243690,0.243690,0.247675,0.247675,0.880351,0.882792,
+ + 0.000000,0.000000,0.000000,0.000000,0.880351,0.882792,0.247675,
+ + 0.247675,0.301181,0.916806,0.590285,0.590285,0.590746,0.795361,
+ + 0.795361,0.802995,0.802995,0.611446,1.039197,1.414601,1.422176,
+ + 1.433839,1.728962,1.745887,1.244630,1.515361,1.525225,1.522765,
+ + 1.520289,1.912136,1.914626,1.924324,2.346411,2.356225,2.797022/
+ DATA IDB /
+ + 0,0,0,1,2,3,5,6,7,13,19,25,8*0,30,32,34,40,46,47,48,49,60,62,
+ + 64,66,69,73,75,76,77,78,79,81,82,84,86,87,90,93,96,98,100/
+ DATA KDEC /
+ + 3,1,15,2,18,0,3,1,16,3,17,0,2,0,1,1,8*0,2,0,4,17,0,0,2,0,5,18,0,
+ + 0,2,0,4,17,0,0,2,0,7,6,0,0,3,0,7,7,8,0,3,0,7,6,6,0,3,1,17,4,6,0,
+ + 3,1,15,2,6,0,2,0,5,18,0,0,2,0,8,6,0,0,3,0,8,8,7,0,3,0,8,6,6,0,3,
+ + 1,18,5,6,0,3,1,16,3,6,0,3,0,6,6,6,0,3,0,7,8,6,0,3,1,18,5,7,0,3,
+ + 1,17,4,8,0,3,1,16,3,7,0,3,1,15,2,8,0,2,0,7,8,0,0,2,0,6,6,20*0,1,
+ + 0,11,3*0,1,0,12,0,0,0,1,0,11,0,0,0,1,0,12,0,0,0,2,0,1,1,0,0,3,0,
+ + 6,6,6,0,3,0,7,8,6,0,3,0,1,7,8,0,3,0,1,3,2,7*0,3,0,7,8,23,0,3,0,6
+ + ,6,23,0,2,0,1,27,0,0,2,0,1,32,0,0,2,0,1,1,0,0,3,0,6,6,6,0,2,0,7,
+ + 6,0,0,2,0,8,6,0,0,2,0,7,8,0,0,2,0,21,7,0,0,2,0,9,6,0,0,54*0,2,0,
+ + 22,8,0,0,2,0,10,6,0,0,2,0,9,8,0,0,2,0,21,6,0,0,2,0,10,7,0,0,
+ + 2,0,22,6,0,0,3,0,7,8,6,0,2,0,1,6,0,0,2,0,7,8,0,0,2,0,9,10,0,
+ + 0,2,0,11,12,0,0,3,0,7,
+ + 8,6,0,2,0,1,23,0,0,2,0,13,6,0,0,2,0,14,7,0,0,2,0,39,1,0,0,2,
+ + 0,14,8,0,0,2,0,39,6,0,0,2,0,39,8,0,0,2,0,13,8,0,0,2,0,
+ + 14,6,0,0,2,0,13,7,0,0,2,0,13,6,
+ + 0,0,2,0,14,7,0,0,2,0,13,8,0,0,2,0,14,6,0,0,2,0,14,8,0,0,2,0,
+ + 39,7,0,0,2,0,34,6,0,0,2,0,35,7,0,0,2,0,39,6,0,0,2,0,34,8,0,0,
+ + 2,0,36,7,0,0,2,0,39,8,0,0,2,
+ + 0,35,8,0,0,2,0,36,6,0,0,2,0,37,6,0,0,2,0,38,7,0,0,2,0,
+ + 37,8,0,0,2,0,38,6,0,0,2,0,39,10,0,0,2,0,37,8,0,0,2,0,38,6,0,0/
+ DATA LBARP/1,3,2,5,4,6,8,7,10,9,11,12,-13,-14,16,15,18,17,13,14,
+ + 22,21,23,24,26,25,27,29,28,31,30,32,33,-34,-35,-36,-37,-38,-39,
+ + -40,-41,-42,-43,-44,-45,-46,-47,-48,-49/
+ DATA ICHP /0,1,-1,1,-1,0,1,-1,1,-1,0,0,1,0,4*0,-1,0,4*0,
+ + 1,-1,0,1,-1,4*0,1,0,-1,0,-1,0,2,1,0,-1,1,0,-1,0,-1,-1/
+ DATA ISTR /8*0,-1,+1,10,10,8*0,-1,+1,5*0,-1,+1,-1,+1,2*0,
+ + 3*1,2*2,1,4*0,3*1,2*2,3 /
+ DATA IBAR /12*0,2*1,4*0,2*-1,13*0,16*1/
+ DATA NAMP /
+ + ' ','gam ','e+','e-','mu+','mu-','pi0',
+ + 'pi+','pi-','k+', 'k-', 'k0l','k0s',
+ + 'p', 'n', 'nue', 'nueb', 'num', 'numb', 'pbar', 'nbar',
+ + 'k0', 'k0b', 'eta', 'etap', 'rho+', 'rho-','rho0',
+ + 'k*+','k*-','k*0','k*0b','omeg', 'phi', 'SIG+', 'SIG0',
+ + 'SIG-','XI0','XI-','LAM','DELT++','DELT+','DELT0','DELT-',
+ + 'SIG*+ ','SIG*0','SIG*-', 'XI*0', 'XI*-', 'OME*-'/
+ DATA S_LIFE /0.,0.,0.,2.197D-6,2.197D-6,8.4D-17,2.6033D-8,
+ + 2.6033D-8,1.2371D-8,1.2371D-8,
+ + 0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,
+ + 0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,0.,
+ + 0.,0.,0./
+ END
+C->
+ BLOCK DATA PARAM_INI
+C....This block data contains default values
+C. of the parameters used in fragmentation
+C................................................
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+ COMMON /S_CZDIS/ FA, FB0
+ COMMON /S_CZDISs/ FAs1, fAs2
+ COMMON /S_CZLEAD/ CLEAD, FLEAD
+ COMMON /S_CPSPL/ CCHIK(3,6:14)
+ COMMON /S_CQDIS/ PPT0 (33),ptflag
+ COMMON /S_CDIF0/ FFD, FBD, FDD
+ COMMON /S_CFLAFR/ PAR(8)
+C...Longitudinal Fragmentation function
+ DATA FA /0.5/, FB0 /0.8/
+C...Longitudinal Fragmentation function for leading baryons
+ DATA CLEAD /0.0/, FLEAD /0.6/
+c strange fragmentation
+ data FAs1 /3./, fAs2 /3./
+c data FAs1 /0./, fAs2 /0./
+C...pT of sea partons
+ DATA PTFLAG /1./
+ DATA PPT0 /0.30,0.30,0.450,30*0.60/
+C...Splitting parameters
+ DATA CCHIK /21*2.,6*3./
+C...Parameters of flavor formation
+ DATA PAR /0.04,0.25,0.25,0.14,0.3,0.3,0.15,0./
+ END
+
+
+ SUBROUTINE gamma_h(Ecm,ip1,Imode,ifbad)
+C**********************************************************************
+C
+C simple simulation of low-energy interactions (R.E. 03/98)
+C
+C changed to simulate superposition of reggeon and pomeron exchange
+C interface to Lund / JETSET 7.4 fragmentation
+C (R.E. 08/98)
+C
+C
+C
+C input: ip1 incoming particle
+C 13 - p
+C 14 - n
+C Ecm CM energy in GeV
+C Imode interaction mode
+C 0 - multi-pion fragmentation
+C 5 - fragmentation in resonance region
+C 1 - quasi-elastic / diffractive interaction
+C (p/n-gamma --> n/p rho)
+C 4 - quasi-elastic / diffractive interaction
+C (p/n-gamma --> n/p omega)
+C 2 - direct interaction (p/n-gamma --> n/p pi)
+C 3 - direct interaction (p/n-gamma --> delta pi)
+C IFBAD control flag
+C (0 all OK,
+C 1 generation of interaction not possible)
+C
+C**********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON /S_RUN/ SQS, S, Q2MIN, XMIN, ZMIN, kb, kt, a1, a2, Nproc
+ COMMON /S_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+ COMMON /S_CHP/ S_LIFE(49), ICHP(49), ISTR(49), IBAR(49)
+ COMMON /S_MASS1/ AM(49), AM2(49)
+ COMMON /S_CFLAFR/ PAR(8)
+ SAVE
+
+ DIMENSION P_dec(10,5), P_in(5)
+ DIMENSION xs1(2), xs2(2), xmi(2), xma(2)
+ DIMENSION LL(10), Ijoin(4)
+
+ DOUBLE PRECISION PA1(4), PA2(4), P1(4), P2(4)
+
+ DATA Ic / 0 /
+
+C second particle is always photon
+ IP2 = 1
+C parameters of pi0 suppression
+ a1 = 0.5D0
+ a2 = 0.5D0
+C parameter of strangeness suppression
+ PAR(2) = 0.18D0
+C slope of pomeron trajectory
+ alphap = 0.25D0
+
+ ifbad = 0
+ SQS = Ecm
+ S = SQS*SQS
+ Ic = Ic+1
+
+
+ IF((Imode.eq.1).or.(Imode.eq.4)) THEN
+
+C***********************************************************************
+
+C simulation of diffraction
+
+ ipa = ip1
+ ipb = ip2
+
+ if(Imode.eq.1) then
+ Nproc = 1
+ if(ip1.eq.1) then
+ ipa = 27
+ else if(ip2.eq.1) then
+ ipb = 27
+ endif
+ else if(Imode.eq.4) then
+ Nproc = 4
+ if(ip1.eq.1) then
+ ipa = 32
+ else if(ip2.eq.1) then
+ ipb = 32
+ endif
+ endif
+
+ am_a = AM(ipa)
+ am_b = AM(ipb)
+ if(am_a+am_b.ge.Ecm-1.D-2) am_a = Ecm - am_b-1.D-2
+
+C find t range
+ e1 = 0.5D0*(Ecm + AM(ip1)**2/Ecm - AM(ip2)**2/Ecm)
+ if(e1.gt.100.D0*AM(ip1)) then
+ pcm1 = e1 - 0.5D0*AM(ip1)**2/e1
+ else
+ pcm1 = sqrt((e1-AM(ip1))*(e1+AM(ip1)))
+ endif
+ e3 = 0.5D0*(Ecm + am_a**2/Ecm - am_b**2/Ecm)
+ if(e3.gt.100.D0*am_a) then
+ pcm3 = e3 - 0.5D0*am_a**2/e3
+ else
+ pcm3 = sqrt((e3-am_a)*(e3+am_a))
+ endif
+ t0 = ((AM(ip1)**2-am_a**2-AM(ip2)**2+am_b**2)/(2.D0*Ecm))**2
+ & -(pcm1-pcm3)**2-0.0001D0
+ t1 = ((AM(ip1)**2-am_a**2-AM(ip2)**2+am_b**2)/(2.D0*Ecm))**2
+ & -(pcm1+pcm3)**2+0.0001D0
+
+C sample t
+ b = 6.5D0+2.D0*alphap*log(S)
+ t = 1.D0/b*log((exp(b*t0)-exp(b*t1))*RNDM(0)+exp(b*t1))
+
+C kinematics
+ pl = (2.D0*e1*e3+t-AM(ip1)**2-am_a**2)/(2.D0*pcm1)
+ pt = (pcm3-pl)*(pcm3+pl)
+ if(pt.lt.0.D0) then
+ pl = sign(pcm3,pl)
+ pt = 1.D-6
+ else
+ pt = sqrt(pt)
+ endif
+ phi = 6.28318530717959D0*RNDM(0)
+
+ LLIST(1) = ipa
+ P(1,4) = e3
+ P(1,1) = SIN(phi)*pt
+ P(1,2) = COS(phi)*pt
+ P(1,3) = pl
+ P(1,5) = am_a
+ LLIST(2) = ipb
+ P(2,1) = -P(1,1)
+ P(2,2) = -P(1,2)
+ P(2,3) = -P(1,3)
+ P(2,4) = Ecm - P(1,4)
+ P(2,5) = am_b
+ np = 2
+
+ call DECSIB
+
+ ELSE IF((Imode.eq.2).or.(Imode.eq.3)) THEN
+
+C***********************************************************************
+
+C simulation of direct p-gamma process
+
+ if(ip1.eq.13) then
+C projectile is a proton
+ if(Imode.eq.2) then
+ Nproc = 2
+ ipa = 14
+ ipb = 7
+ else
+ Nproc = 3
+ if(rndm(0).gt.0.25) then
+ ipa = 40
+ ipb = 8
+ else
+ ipa = 42
+ ipb = 7
+ endif
+ endif
+ else if(ip1.eq.14) then
+C projectile is a neutron
+ if(Imode.eq.2) then
+ Nproc = 2
+ ipa = 13
+ ipb = 8
+ else
+ Nproc = 3
+ if(rndm(0).gt.0.25) then
+ ipa = 43
+ ipb = 7
+ else
+ ipa = 41
+ ipb = 8
+ endif
+ endif
+ endif
+
+ am_a = AM(ipa)
+ am_b = AM(ipb)
+ if(am_a+am_b.ge.Ecm-1.e-3) am_a = Ecm - am_b-1.D-3
+
+C find t range
+ e1 = 0.5D0*(Ecm + AM(ip1)**2/Ecm - AM(ip2)**2/Ecm)
+ if(e1.gt.100.D0*AM(ip1)) then
+ pcm1 = e1 - 0.5D0*AM(ip1)**2/e1
+ else
+ pcm1 = sqrt((e1-AM(ip1))*(e1+AM(ip1)))
+ endif
+ e3 = 0.5D0*(Ecm + am_a**2/Ecm - am_b**2/Ecm)
+ if(e3.gt.100.D0*am_a) then
+ pcm3 = e3 - 0.5D0*am_a**2/e3
+ else
+ pcm3 = sqrt((e3-am_a)*(e3+am_a))
+ endif
+ t0 = ((AM(ip1)**2-am_a**2-AM(ip2)**2+am_b**2)/(2.D0*Ecm))**2
+ & -(pcm1-pcm3)**2-0.0001D0
+ t1 = ((AM(ip1)**2-am_a**2-AM(ip2)**2+am_b**2)/(2.D0*Ecm))**2
+ & -(pcm1+pcm3)**2+0.0001D0
+
+C sample t
+ b = 12.D0
+ t = 1./b*log((exp(b*t0)-exp(b*t1))*RNDM(0)+exp(b*t1))
+
+C kinematics
+ pl = (2.D0*e1*e3+t-AM(ip1)**2-am_a**2)/(2.D0*pcm1)
+ pt = (pcm3-pl)*(pcm3+pl)
+ if(pt.lt.0.D0) then
+ pl = sign(pcm3,pl)
+ pt = 1.D-6
+ else
+ pt = sqrt(pt)
+ endif
+ phi = 6.28318530717959D0*RNDM(0)
+
+ LLIST(1) = ipa
+ P(1,4) = e3
+ P(1,1) = SIN(phi)*pt
+ P(1,2) = COS(phi)*pt
+ P(1,3) = pl
+ P(1,5) = am_a
+ LLIST(2) = ipb
+ P(2,1) = -P(1,1)
+ P(2,2) = -P(1,2)
+ P(2,3) = -P(1,3)
+ P(2,4) = Ecm - P(1,4)
+ P(2,5) = am_b
+ np = 2
+
+ call DECSIB
+
+ ELSE
+
+C***********************************************************************
+
+C simulation of multiparticle production via fragmentation
+
+ Nproc = 0
+
+ SIG_reg = 129.D0*(S-AM(13)**2)**(-0.4525D0)
+ SIG_pom = 67.7D0*(S-AM(13)**2)**0.0808D0
+
+ if(S.gt.2.6D0) then
+ prob_reg = SIG_reg/(SIG_pom+SIG_reg)
+ else
+ prob_reg = 1.D0
+ endif
+
+ ptu =.36D0+.08D0*log10(sqs/30.D0)
+
+ s1 = 1.2D0
+ s2 = 0.6D0
+ as1 = s1**2/S
+ as2 = s2**2/S
+ if(s1+s2.ge.sqs-0.2) then
+ prob_reg = 1.D0
+ endif
+
+ itry = 0
+ 100 continue
+ Istring = 0
+
+C avoid infinite looping
+ itry = itry+1
+ if(itry.gt.50) then
+ print *,' gamma_h: more than 50 internal rejections,'
+ print *,' called with ip1,ip2,Ecm,Imode:',ip1,ip2,Ecm,Imode
+ PAUSE
+ ifbad = 1
+ return
+ endif
+
+C simulate reggeon (one-string topology)
+
+ if(RNDM(0).lt.prob_reg) then
+
+ do i=1,1000
+ call valences(IP1,Ifl1a,Ifl1b)
+ call valences(IP2,Ifl2a,Ifl2b)
+ if(Ifl1b.eq.-Ifl2b) goto 200
+ enddo
+ print *,'gamma_h: simulation of reggeon impossible:',ip1,ip2
+ goto 100
+
+ 200 continue
+
+ np = 0
+ Istring = 1
+
+ ee = Ecm/2.D0
+ 250 continue
+ pt = ptu*sqrt(-log(max(1.D-10,RNDM(0))))
+ if(pt.ge.ee) goto 250
+ phi = 6.2831853D0*RNDM(0)
+ px = pt*COS(phi)
+ py = pt*SIN(phi)
+
+ pz = SQRT(ee**2-px**2-py**2)
+ call lund_put(1,Ifl1a,px,py,pz,ee)
+ px = -px
+ py = -py
+ pz = -pz
+ call lund_put(2,Ifl2a,px,py,pz,ee)
+ Ijoin(1) = 1
+ Ijoin(2) = 2
+ call lujoin(2,Ijoin)
+
+ call lund_frag(Ecm,NP)
+ if(NP.lt.0) then
+ if(Ideb.ge.5)
+ & print *,' gamma_h: rejection (1) by lund_frag, sqs:',Ecm
+ NP = 0
+ goto 100
+ endif
+
+ do i=1,NP
+ call lund_get(i,LLIST(i),
+ & P(i,1),P(i,2),P(i,3),P(i,4),P(i,5))
+ enddo
+
+
+C simulate pomeron (two-string topology)
+
+ else
+
+ call valences(IP1,Ifl1a,Ifl1b)
+ call valences(IP2,Ifl2a,Ifl2b)
+ if(Ifl1a*Ifl2a.lt.0) then
+ j = Ifl2a
+ Ifl2a = Ifl2b
+ Ifl2b = j
+ endif
+
+ pl1 = (1.D0+as1-as2)
+ ps1 = 0.25D0*pl1**2-as1
+ if(ps1.le.0.D0) then
+ if(Ideb.ge.5) print *,' rejection by x-limits (1) ',Ecm
+ prob_reg = 1.D0
+ goto 100
+ endif
+ ps1 = sqrt(ps1)
+ xmi(1) = 0.5D0*pl1-ps1
+ xma(1) = 0.5D0*pl1+ps1
+
+ pl2 = (1.D0+as2-as1)
+ ps2 = 0.25D0*pl2**2-as2
+ if(ps2.le.0.D0) then
+ if(Ideb.ge.5) print *,' rejection by x-limits (2) ',Ecm
+ prob_reg = 1.D0
+ goto 100
+ endif
+ ps2 = sqrt(ps2)
+ xmi(2) = 0.5D0*pl2-ps2
+ xma(2) = 0.5D0*pl2+ps2
+
+ if((xmi(1).ge.xma(1)+0.05D0).or.
+ & (xmi(2).ge.xma(2)+0.05D0)) then
+ if(Ideb.ge.5) print *,' rejection by x-limits (3) ',Ecm
+ prob_reg = 1.D0
+ goto 100
+ endif
+ call PO_SELSX2(xs1,xs2,xmi,xma,as1,as2,Irej)
+ if(Irej.ne.0) then
+ if(Ideb.ge.5) print *,
+ & 'gamma_h: rejection by PO_SELSX2, sqs,m1,m2:',Ecm,s1,s2
+ prob_reg = 1.D0
+ goto 100
+ endif
+
+ NP = 0
+ Istring = 1
+
+ ee = SQRT(XS1(1)*XS2(1))*Ecm/2.D0
+ 260 continue
+ pt = ptu*sqrt(-log(max(1.D-10,RNDM(0))))
+ if(pt.ge.ee) goto 260
+ phi = 6.2831853D0*RNDM(0)
+ px = pt*COS(phi)
+ py = pt*SIN(phi)
+
+ PA1(1) = px
+ PA1(2) = py
+ PA1(3) = XS1(1)*Ecm/2.D0
+ PA1(4) = PA1(3)
+
+ PA2(1) = -px
+ PA2(2) = -py
+ PA2(3) = -XS2(1)*Ecm/2.D0
+ PA2(4) = -PA2(3)
+
+ XM1 = 0.D0
+ XM2 = 0.D0
+ call PO_MSHELL(PA1,PA2,XM1,XM2,P1,P2)
+ px = P1(1)
+ py = P1(2)
+ pz = P1(3)
+ ee = P1(4)
+ call lund_put(1,Ifl1a,px,py,pz,ee)
+ px = P2(1)
+ py = P2(2)
+ pz = P2(3)
+ ee = P2(4)
+ call lund_put(2,Ifl2a,px,py,pz,ee)
+
+ Ijoin(1) = 1
+ Ijoin(2) = 2
+ call lujoin(2,Ijoin)
+
+ ee = SQRT(XS1(2)*XS2(2))*Ecm/2.D0
+ 270 continue
+ pt = ptu*sqrt(-log(max(1.D-10,RNDM(0))))
+ if(pt.ge.ee) goto 270
+ phi = 6.2831853D0*RNDM(0)
+ px = pt*COS(phi)
+ py = pt*SIN(phi)
+
+ PA1(1) = px
+ PA1(2) = py
+ PA1(3) = XS1(2)*Ecm/2.D0
+ PA1(4) = PA1(3)
+
+ PA2(1) = -px
+ PA2(2) = -py
+ PA2(3) = -XS2(2)*Ecm/2.D0
+ PA2(4) = -PA2(3)
+
+ XM1 = 0.D0
+ XM2 = 0.D0
+ call PO_MSHELL(PA1,PA2,XM1,XM2,P1,P2)
+
+ px = P1(1)
+ py = P1(2)
+ pz = P1(3)
+ ee = P1(4)
+ call lund_put(3,Ifl1b,px,py,pz,ee)
+ px = P2(1)
+ py = P2(2)
+ pz = P2(3)
+ ee = P2(4)
+ call lund_put(4,Ifl2b,px,py,pz,ee)
+
+ Ijoin(1) = 3
+ Ijoin(2) = 4
+ call lujoin(2,Ijoin)
+
+ call lund_frag(Ecm,NP)
+ if(NP.lt.0) then
+ if(Ideb.ge.5)
+ & print *,' gamma_h: rejection (2) by lund_frag, sqs:',Ecm
+ NP = 0
+ prob_reg = prob_reg+0.1D0
+ goto 100
+ endif
+
+ do i=1,NP
+ call lund_get(i,LLIST(i),
+ & P(i,1),P(i,2),P(i,3),P(i,4),P(i,5))
+ enddo
+
+ endif
+
+ if(Ideb.ge.10) then
+ print *,' multi-pion event',Istring,NP
+ call print_event(1)
+ endif
+
+C... for fragmentation in resonance region:
+ if (Imode.eq.5) goto 400
+
+C leading baryon/meson effect
+
+ do j=1,np
+ if(((LLIST(J).eq.13).or.(LLIST(J).eq.14))
+ & .and.(p(j,3).lt.0.D0)) then
+ if(rndm(0).lt.(2.D0*p(j,4)/Ecm)**2) goto 100
+ endif
+ if((LLIST(J).ge.6).and.(LLIST(J).le.8)
+ & .and.(p(j,3).lt.-0.4D0)) then
+ if(rndm(0).lt.(2.D0*p(j,4)/Ecm)**2) goto 100
+ endif
+ enddo
+
+C remove elastic/diffractive channels
+
+ ima_0 = 0
+ imb_0 = 0
+ ima_1 = 0
+ imb_1 = 0
+ ima_2 = 0
+ imb_2 = 0
+ imul = 0
+
+ if(ip1.eq.1) then
+ iba_0 = 6
+ iba_1 = 27
+ iba_2 = 32
+ else
+ iba_0 = ip1
+ iba_1 = ip1
+ iba_2 = ip1
+ endif
+ if(ip2.eq.1) then
+ ibb_0 = 6
+ ibb_1 = 27
+ ibb_2 = 32
+ else
+ ibb_0 = ip2
+ ibb_1 = ip2
+ ibb_2 = ip2
+ endif
+
+ do j=1,np
+ l1 = abs(LLIST(J))
+ if(l1.lt.10000) then
+ if(LLIST(J).eq.iba_0) ima_0 = 1
+ if(LLIST(J).eq.iba_1) ima_1 = 1
+ if(LLIST(J).eq.iba_2) ima_2 = 1
+ if(LLIST(J).eq.ibb_0) imb_0 = 1
+ if(LLIST(J).eq.ibb_1) imb_1 = 1
+ if(LLIST(J).eq.ibb_2) imb_2 = 1
+ imul = imul+1
+ endif
+ enddo
+
+ if(imul.eq.2) then
+ if(ima_0*imb_0.eq.1) goto 100
+ if(ima_1*imb_1.eq.1) goto 100
+ if(ima_2*imb_2.eq.1) goto 100
+ endif
+
+C remove direct channels
+
+ if((imul.eq.2).and.
+ & (ip2.eq.1).and.((ip1.eq.13).or.(ip1.eq.14))) then
+
+ ima_0 = 0
+ imb_0 = 0
+ ima_1 = 0
+ imb_1 = 0
+ ima_2 = 0
+ imb_2 = 0
+ ima_3 = 0
+ imb_3 = 0
+
+ if(ip1.eq.13) then
+ iba_0 = 14
+ ibb_0 = 7
+ iba_1 = 40
+ ibb_1 = 8
+ iba_2 = 42
+ ibb_2 = 7
+ iba_3 = 13
+ ibb_3 = 23
+ else
+ iba_0 = 13
+ ibb_0 = 8
+ iba_1 = 43
+ ibb_1 = 7
+ iba_2 = 41
+ ibb_2 = 8
+ iba_3 = 14
+ ibb_3 = 23
+ endif
+
+ do j=1,np
+ l1 = abs(LLIST(J))
+ if(l1.lt.10000) then
+ if(LLIST(J).eq.iba_0) ima_0 = 1
+ if(LLIST(J).eq.iba_1) ima_1 = 1
+ if(LLIST(J).eq.iba_2) ima_2 = 1
+ if(LLIST(J).eq.iba_3) ima_3 = 1
+ if(LLIST(J).eq.ibb_0) imb_0 = 1
+ if(LLIST(J).eq.ibb_1) imb_1 = 1
+ if(LLIST(J).eq.ibb_2) imb_2 = 1
+ if(LLIST(J).eq.ibb_3) imb_3 = 1
+ endif
+ enddo
+
+ if(ima_0*imb_0.eq.1) goto 100
+ if(ima_1*imb_1.eq.1) goto 100
+ if(ima_2*imb_2.eq.1) goto 100
+ if(ima_3*imb_3.eq.1) goto 100
+
+ endif
+
+C suppress events with many pi0's
+
+ ima_0 = 0
+ imb_0 = 0
+ do j=1,np
+C neutral mesons
+ if(LLIST(J).eq.6) ima_0 = ima_0+1
+ if(LLIST(J).eq.11) ima_0 = ima_0+1
+ if(LLIST(J).eq.12) ima_0 = ima_0+1
+ if(LLIST(J).eq.21) ima_0 = ima_0+1
+ if(LLIST(J).eq.22) ima_0 = ima_0+1
+ if(LLIST(J).eq.23) ima_0 = ima_0+1
+ if(LLIST(J).eq.24) ima_0 = ima_0+1
+ if(LLIST(J).eq.27) ima_0 = ima_0+1
+ if(LLIST(J).eq.32) ima_0 = ima_0+1
+ if(LLIST(J).eq.33) ima_0 = ima_0+1
+C charged mesons
+ if(LLIST(J).eq.7) imb_0 = imb_0+1
+ if(LLIST(J).eq.8) imb_0 = imb_0+1
+ if(LLIST(J).eq.9) imb_0 = imb_0+1
+ if(LLIST(J).eq.10) imb_0 = imb_0+1
+ if(LLIST(J).eq.25) imb_0 = imb_0+1
+ if(LLIST(J).eq.26) imb_0 = imb_0+1
+ enddo
+
+ prob_1 = a1*DBLE(imb_0)/max(DBLE(ima_0+imb_0),1.D0)+a2
+
+ if(RNDM(0).GT.prob_1) goto 100
+
+
+C correct multiplicity at very low energies
+
+ ND = 0
+
+ E_ref_1 = 1.6D0
+ E_ref_2 = 1.95D0
+
+ if((imul.eq.3)
+ & .and.(Ecm.gt.E_ref_1).and.(Ecm.lt.E_ref_2)) then
+
+ ima_0 = 0
+ ima_1 = 0
+ ima_2 = 0
+ imb_0 = 0
+ imb_1 = 0
+ iba_0 = 0
+ iba_1 = 0
+ iba_2 = 0
+ ibb_0 = 0
+ ibb_1 = 0
+C incoming proton
+ if(ip1.eq.13) then
+ iba_0 = 13
+ iba_1 = 7
+ iba_2 = 8
+ ibb_0 = 14
+ ibb_1 = 6
+C incoming neutron
+ else if(ip1.eq.14) then
+ iba_0 = 14
+ iba_1 = 7
+ iba_2 = 8
+ ibb_0 = 13
+ ibb_1 = 6
+ endif
+ do j=1,np
+ if(LLIST(J).eq.iba_0) ima_0 = ima_0+1
+ if(LLIST(J).eq.iba_1) ima_1 = ima_1+1
+ if(LLIST(J).eq.iba_2) ima_2 = ima_2+1
+ if(LLIST(J).eq.ibb_0) imb_0 = imb_0+1
+ if(LLIST(J).eq.ibb_1) imb_1 = imb_1+1
+ enddo
+
+C N gamma --> N pi+ pi-
+ if(ima_0*ima_1*ima_2.eq.1) then
+ Elog = LOG(Ecm)
+ Elog_1 = LOG(E_ref_1)
+ Elog_2 = LOG(E_ref_2)
+ prob = 0.1D0*4.D0/(Elog_2-Elog_1)**2
+ & *(Elog-Elog_1)*(Elog_2-Elog)
+
+ if(RNDM(0).lt.prob) then
+ LL(1) = ip1
+ LL(2) = 7
+ LL(3) = 8
+ LL(4) = 6
+ ND = 4
+ endif
+
+ endif
+
+ endif
+
+
+ E_ref_1 = 1.95D0
+ E_ref_2 = 2.55D0
+
+ if((imul.eq.4)
+ & .and.(Ecm.gt.E_ref_1).and.(Ecm.lt.E_ref_2)) then
+
+ ima_0 = 0
+ ima_1 = 0
+ ima_2 = 0
+ imb_0 = 0
+ imb_1 = 0
+ iba_0 = 0
+ iba_1 = 0
+ iba_2 = 0
+ ibb_0 = 0
+ ibb_1 = 0
+C incoming proton
+ if(ip1.eq.13) then
+ iba_0 = 13
+ iba_1 = 7
+ iba_2 = 8
+ ibb_0 = 14
+ ibb_1 = 6
+C incoming neutron
+ else if(ip1.eq.14) then
+ iba_0 = 14
+ iba_1 = 7
+ iba_2 = 8
+ ibb_0 = 13
+ ibb_1 = 6
+ endif
+ do j=1,np
+ if(LLIST(J).eq.iba_0) ima_0 = ima_0+1
+ if(LLIST(J).eq.iba_1) ima_1 = ima_1+1
+ if(LLIST(J).eq.iba_2) ima_2 = ima_2+1
+ if(LLIST(J).eq.ibb_0) imb_0 = imb_0+1
+ if(LLIST(J).eq.ibb_1) imb_1 = imb_1+1
+ enddo
+
+C N gamma --> N pi+ pi- pi0
+ if(ima_0*ima_1*ima_2*imb_1.eq.1) then
+ Elog = LOG(Ecm)
+ Elog_2 = LOG(E_ref_2)
+ Elog_1 = LOG(E_ref_1)
+ prob = 0.1D0*4.D0/(Elog_2-Elog_1)**2
+ & *(Elog-Elog_1)*(Elog_2-Elog)
+
+ if(RNDM(0).lt.prob) then
+ if(ip1.eq.13) then
+ LL(1) = 14
+ LL(2) = 7
+ LL(3) = 7
+ LL(4) = 8
+ else
+ LL(1) = 13
+ LL(2) = 7
+ LL(3) = 8
+ LL(4) = 8
+ endif
+ ND = 4
+ endif
+
+ endif
+
+ endif
+
+
+ if(ND.gt.0) then
+ P_in(1) = 0.D0
+ P_in(2) = 0.D0
+ P_in(3) = 0.D0
+ P_in(4) = Ecm
+ P_in(5) = Ecm
+ call DECPAR(0,P_in,ND,LL,P_dec)
+ Iflip = 0
+ do j=1,ND
+ LLIST(j) = LL(j)
+ do k=1,5
+ P(j,k) = P_dec(j,k)
+ enddo
+ if(((LLIST(j).eq.13).or.(LLIST(j).eq.14))
+ & .and.(P(j,3).lt.0.D0)) Iflip = 1
+ enddo
+ if(Iflip.ne.0) then
+ do j=1,ND
+ P(j,3) = -P(j,3)
+ enddo
+ endif
+ NP = ND
+ endif
+
+C... for fragmentation in resonance region:
+ 400 continue
+
+ call DECSIB
+
+ ENDIF
+
+ if(Ideb.ge.10) then
+ if(Ideb.ge.20) then
+ call print_event(2)
+ else
+ call print_event(1)
+ endif
+ endif
+
+ IQchr = ICHP(ip1)+ICHP(ip2)
+ IQbar = IBAR(ip1)+IBAR(ip2)
+ call check_event(-Ic,Ecm,0.D0,0.D0,0.D0,IQchr,IQbar,Irej)
+
+ end
+
+
+ SUBROUTINE print_event(Iout)
+C*********************************************************************
+C
+C print final state particles
+C
+C (R.E. 03/98)
+C
+C**********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON /S_RUN/ SQS, S, Q2MIN, XMIN, ZMIN, kb, kt, a1, a2, Nproc
+ COMMON /S_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+ COMMON /S_CSYDEC/ CBR(102), IDB(49), KDEC(612), LBARP(49)
+ COMMON /S_CHP/ S_LIFE(49), ICHP(49), ISTR(49), IBAR(49)
+ COMMON /S_MASS1/ AM(49), AM2(49)
+ COMMON /S_CNAM/ NAMP (0:49)
+ CHARACTER*6 NAMP
+ CHARACTER CODE*18
+ SAVE
+
+ if(iout.gt.0) then
+
+ print *,' --------------------------------------------------'
+
+ if(Nproc.eq.1) then
+ print *,' diffractive rho-0 production',Nproc
+ else if(Nproc.eq.2) then
+ print *,' direct interaction 1',Nproc
+ else if(Nproc.eq.3) then
+ print *,' direct interaction 2',Nproc
+ else if(Nproc.eq.4) then
+ print *,' diffractive omega production',Nproc
+ else if(Nproc.eq.0) then
+ print *,' multi-pion/fragmentation contribution',Nproc
+ else if((Nproc.gt.10).and.(Nproc.lt.20)) then
+ print *,' resonance production and decay',Nproc-10
+ else
+ print *,' unknown process',Nproc
+ endif
+
+ i0 = 0
+ px = 0.D0
+ py = 0.D0
+ pz = 0.D0
+ ee = 0.D0
+ ichar = 0
+ ibary = 0
+ do j=1,np
+ l1 = abs(LLIST(J))
+ l = mod(llist(j),10000)
+ if(l1.lt.10000) then
+ px = px + P(j,1)
+ py = py + P(j,2)
+ pz = pz + P(j,3)
+ ee = ee + P(j,4)
+ ichar = ichar+sign(1,l)*ICHP(iabs(l))
+ ibary = ibary+sign(1,l)*IBAR(iabs(l))
+ endif
+ if((l1.lt.10000).or.(Iout.GE.2)) then
+ i0 = i0+1
+ code = ' '
+ code(1:6) = namp(iabs(l))
+ if (l .lt. 0) code(7:9) = 'bar'
+ write (6,120) i0,CODE,l1*sign(1,l),sign(1,l)*ICHP(iabs(l)),
+ & (P(j,k),k=1,4)
+ endif
+ enddo
+ write (6,122) ' sum: ',px,py,pz,ee
+ print *,' charge QN: ',ichar,' baryon QN: ',ibary
+ print *,' --------------------------------------------------'
+120 FORMAT(1X,I4,1X,A18,1X,I6,1X,I2,1X,2(F9.3,2X),2(E9.3,2X))
+122 FORMAT(7X,A8,20X,2(F9.3,2X),2(E9.3,2X))
+
+ endif
+
+ END
+
+
+ SUBROUTINE check_event(Ic,Esum,PXsum,PYsum,PZsum,IQchr,IQbar,Irej)
+C***********************************************************************
+C
+C check energy-momentum and quantum number conservation
+C
+C (R.E. 08/98)
+C
+C***********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON /S_RUN/ SQS, S, Q2MIN, XMIN, ZMIN, kb, kt, a1, a2, Nproc
+ COMMON /S_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+ COMMON /S_CSYDEC/ CBR(102), IDB(49), KDEC(612), LBARP(49)
+ COMMON /S_CHP/ S_LIFE(49), ICHP(49), ISTR(49), IBAR(49)
+ COMMON /S_MASS1/ AM(49), AM2(49)
+ COMMON /S_CNAM/ NAMP (0:49)
+ CHARACTER*6 NAMP
+ SAVE
+
+ px = 0.D0
+ py = 0.D0
+ pz = 0.D0
+ ee = 0.D0
+ ichar = 0
+ ibary = 0
+ Iprint = 0
+
+ PLscale = Esum
+ PTscale = 1.D0
+
+ do j=1,np
+ l1 = abs(LLIST(J))
+ l = mod(llist(j),10000)
+ if(l1.lt.10000) then
+ px = px + P(j,1)
+ py = py + P(j,2)
+ pz = pz + P(j,3)
+ ee = ee + P(j,4)
+ ichar = ichar+sign(1,l)*ICHP(iabs(l))
+ ibary = ibary+sign(1,l)*IBAR(iabs(l))
+ endif
+ enddo
+
+ if(ichar.ne.IQchr) then
+ print *,' charge conservation violated',Ic
+ Iprint = 1
+ endif
+ if(ibary.ne.IQbar) then
+ print *,' baryon number conservation violated',Ic
+ Iprint = 1
+ endif
+ if(abs((px-PXsum)/MAX(PXsum,PTscale)).gt.1.D-3) then
+ print *,' x momentum conservation violated',Ic
+ Iprint = 1
+ endif
+ if(abs((py-PYsum)/MAX(PYsum,PTscale)).gt.1.D-3) then
+ print *,' y momentum conservation violated',Ic
+ Iprint = 1
+ endif
+ if(abs((pz-Pzsum)/MAX(ABS(PZsum),PLscale)).gt.1.D-3) then
+ print *,' z momentum conservation violated',Ic
+ Iprint = 1
+ endif
+ if(abs((ee-Esum)/MAX(Esum,1.D0)).gt.1.D-3) then
+ print *,' energy conservation violated',Ic
+ Iprint = 1
+ endif
+
+ if(Iprint.ne.0) call print_event(1)
+
+ Irej = Iprint
+
+ END
+
+
+ SUBROUTINE valences(ip,ival1,ival2)
+C**********************************************************************
+C
+C valence quark composition of various particles (R.E. 03/98)
+C (with special treatment of photons)
+C
+C**********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+ if(ip.eq.1) then
+ if(rndm(0).gt.0.2D0) then
+ ival1 = 1
+ ival2 = -1
+ else
+ ival1 = 2
+ ival2 = -2
+ endif
+ else if(ip.eq.6) then
+ if(rndm(0).gt.0.5D0) then
+ ival1 = 1
+ ival2 = -1
+ else
+ ival1 = 2
+ ival2 = -2
+ endif
+ else if(ip.eq.7) then
+ ival1 = 1
+ ival2 = -2
+ else if(ip.eq.8) then
+ ival1 = 2
+ ival2 = -1
+ else if(ip.eq.13) then
+ Xi = rndm(0)
+ if(Xi.lt.0.3333D0) then
+ ival1 = 12
+ ival2 = 1
+ else if(Xi.lt.0.6666D0) then
+ ival1 = 21
+ ival2 = 1
+ else
+ ival1 = 11
+ ival2 = 2
+ endif
+ else if(ip.eq.14) then
+ Xi = rndm(0)
+ if(Xi.lt.0.3333D0) then
+ ival1 = 12
+ ival2 = 2
+ else if(Xi.lt.0.6666D0) then
+ ival1 = 21
+ ival2 = 2
+ else
+ ival1 = 22
+ ival2 = 1
+ endif
+ endif
+
+ if((ip.lt.13).and.(rndm(0).lt.0.5D0)) then
+ k = ival1
+ ival1 = ival2
+ ival2 = k
+ endif
+
+ END
+
+
+ SUBROUTINE DECSIB
+C***********************************************************************
+C
+C Decay all unstable particle in SIBYLL
+C decayed particle have the code increased by 10000
+C
+C (taken from SIBYLL 1.7, R.E. 04/98)
+C
+C***********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON /S_CSYDEC/ CBR(102), IDB(49), KDEC(612), LBARP(49)
+ COMMON /S_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+ COMMON /S_PLIST1/ LLIST1(2000)
+ SAVE
+
+ DIMENSION P0(5), LL(10), PD(10,5)
+
+ NN = 1
+ DO J=1,NP
+ LLIST1(J) = 0
+ ENDDO
+ DO WHILE (NN .LE. NP)
+ L= LLIST(NN)
+ IF (IDB(IABS(L)) .GT. 0) THEN
+ DO K=1,5
+ P0(K) = P(NN,K)
+ ENDDO
+ ND = 0
+ CALL DECPAR (L,P0,ND,LL,PD)
+ LLIST(NN) = LLIST(NN)+ISIGN(10000,LLIST(NN))
+ DO J=1,ND
+ DO K=1,5
+ P(NP+J,K) = PD(J,K)
+ ENDDO
+ LLIST(NP+J)=LL(J)
+ LLIST1(NP+J)=NN
+ ENDDO
+ NP=NP+ND
+ ENDIF
+ NN = NN+1
+ ENDDO
+
+ END
+
+
+ SUBROUTINE DECPAR(LA,P0,ND,LL,P)
+C***********************************************************************
+C
+C This subroutine generates the decay of a particle
+C with ID = LA, and 5-momentum P0(1:5)
+C into ND particles of 5-momenta P(j,1:5) (j=1:ND)
+C
+C If the initial particle code is LA=0
+C then ND and LL(1:ND) are considered as input and
+C the routine generates a phase space decay into ND
+C particles of codes LL(1:nd)
+C
+C (taken from SIBYLL 1.7, muon decay corrected, R.E. 04/98)
+C
+C***********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON /S_CSYDEC/ CBR(102), IDB(49), KDEC(612), LBARP(49)
+ COMMON /S_MASS1/ AM(49), AM2(49)
+ SAVE
+
+ DIMENSION P0(5), LL(10), P(10,5)
+ DIMENSION PV(10,5), RORD(10), UE(3),BE(3), FACN(3:10)
+
+ DATA FACN /2.D0,5.D0,15.D0,60.D0,250.D0,
+ + 1500.D0,12000.D0,120000.D0/
+ DATA PI /3.1415926D0/
+
+C...c.m.s. Momentum in two particle decays
+ PAWT(A,B,C) = SQRT((A**2-(B+C)**2)*(A**2-(B-C)**2))/(2.D0*A)
+
+C...Phase space decay into the particles in the list
+ IF (LA .EQ. 0) THEN
+ MAT = 0
+ MBST = 0
+ PS = 0.
+ DO J=1,ND
+ P (J,5) = AM(IABS(LL(J)))
+ PV(J,5) = AM(IABS(LL(J)))
+ PS = PS+P(J,5)
+ ENDDO
+ DO J=1,4
+ PV(1,J) = P0(J)
+ ENDDO
+ PV(1,5) = P0(5)
+ GOTO 140
+ ENDIF
+
+C...Choose decay channel
+ L = IABS(LA)
+ ND=0
+ IDC = IDB(L)-1
+ IF (IDC+1 .LE.0) RETURN
+ RBR = RNDM(0)
+110 IDC=IDC+1
+ IF(RBR.GT.CBR(IDC)) GOTO 110
+
+ KD =6*(IDC-1)+1
+ ND = KDEC(KD)
+ MAT= KDEC(KD+1)
+
+ MBST=0
+ IF (MAT .GT.0 .AND. P0(4) .GT. 20.D0*P0(5)) MBST=1
+ IF (MAT .GT.0 .AND. MBST .EQ. 0)
+ + BETA = SQRT(P0(1)**2+P0(2)**2+P0(3)**2)/P0(4)
+
+ PS = 0.D0
+ DO J=1,ND
+ LL(J) = KDEC(KD+1+J)
+ P(J,5) = AM(LL(J))
+ PV(J,5) = AM(LL(J))
+ PS = PS + P(J,5)
+ ENDDO
+ DO J=1,4
+ PV(1,J) = 0.D0
+ IF (MBST .EQ. 0) PV(1,J) = P0(J)
+ ENDDO
+ IF (MBST .EQ. 1) PV(1,4) = P0(5)
+ PV(1,5) = P0(5)
+
+140 IF (ND .EQ. 2) GOTO 280
+
+ IF (ND .EQ. 1) THEN
+ DO J=1,4
+ P(1,J) = P0(J)
+ ENDDO
+ RETURN
+ ENDIF
+
+C...Calculate maximum weight for ND-particle decay
+ WWTMAX = 1.D0/FACN(ND)
+ PMAX=PV(1,5)-PS+P(ND,5)
+ PMIN=0.D0
+ DO IL=ND-1,1,-1
+ PMAX = PMAX+P(IL,5)
+ PMIN = PMIN+P(IL+1,5)
+ WWTMAX = WWTMAX*PAWT(PMAX,PMIN,P(IL,5))
+ ENDDO
+
+C...generation of the masses, compute weight, if rejected try again
+240 RORD(1) = 1.D0
+ DO 260 IL1=2,ND-1
+ RSAV = RNDM(0)
+ DO 250 IL2=IL1-1,1,-1
+ IF(RSAV.LE.RORD(IL2)) GOTO 260
+250 RORD(IL2+1)=RORD(IL2)
+260 RORD(IL2+1)=RSAV
+ RORD(ND) = 0.D0
+ WT = 1.D0
+ DO 270 IL=ND-1,1,-1
+ PV(IL,5)=PV(IL+1,5)+P(IL,5)+(RORD(IL)-RORD(IL+1))*(PV(1,5)-PS)
+270 WT=WT*PAWT(PV(IL,5),PV(IL+1,5),P(IL,5))
+ IF (WT.LT.RNDM(0)*WWTMAX) GOTO 240
+
+C...Perform two particle decays in respective cm frame
+280 DO 300 IL=1,ND-1
+ PA=PAWT(PV(IL,5),PV(IL+1,5),P(IL,5))
+ UE(3)=2.D0*RNDM(0)-1.D0
+ PHI=2.D0*PI*RNDM(0)
+ UT = SQRT(1.D0-UE(3)**2)
+ UE(1) = UT*COS(PHI)
+ UE(2) = UT*SIN(PHI)
+ DO 290 J=1,3
+ P(IL,J)=PA*UE(J)
+290 PV(IL+1,J)=-PA*UE(J)
+ P(IL,4)=SQRT(PA**2+P(IL,5)**2)
+300 PV(IL+1,4)=SQRT(PA**2+PV(IL+1,5)**2)
+
+C...Lorentz transform decay products to lab frame
+ DO 310 J=1,4
+310 P(ND,J)=PV(ND,J)
+ DO 340 IL=ND-1,1,-1
+ DO 320 J=1,3
+320 BE(J)=PV(IL,J)/PV(IL,4)
+ GA=PV(IL,4)/PV(IL,5)
+ DO 340 I=IL,ND
+ BEP = BE(1)*P(I,1)+BE(2)*P(I,2)+BE(3)*P(I,3)
+ DO 330 J=1,3
+330 P(I,J)=P(I,J)+GA*(GA*BEP/(1.+GA)+P(I,4))*BE(J)
+340 P(I,4)=GA*(P(I,4)+BEP)
+
+C...Weak decays
+ IF (MAT .EQ. 1) THEN
+ F1=P(2,4)*P(3,4)-P(2,1)*P(3,1)-P(2,2)*P(3,2)-P(2,3)*P(3,3)
+ IF (MBST.EQ.1) WT = P0(5)*P(1,4)*F1
+ IF (MBST.EQ.0)
+ + WT=F1*(P(1,4)*P0(4)-P(1,1)*P0(1)-P(1,2)*P0(2)-P(1,3)*P0(3))
+ WTMAX = P0(5)**4/16.D0
+ IF(WT.LT.RNDM(0)*WTMAX) GOTO 240
+ ENDIF
+
+
+C...Boost back for rapidly moving particle
+ IF (MBST .EQ. 1) THEN
+ DO 440 J=1,3
+440 BE(J)=P0(J)/P0(4)
+ GA= P0(4)/P0(5)
+ DO 460 I=1,ND
+ BEP=BE(1)*P(I,1)+BE(2)*P(I,2)+BE(3)*P(I,3)
+ DO 450 J=1,3
+450 P(I,J)=P(I,J)+GA*(GA*BEP/(1.+GA)+P(I,4))*BE(J)
+460 P(I,4)=GA*(P(I,4)+BEP)
+ ENDIF
+
+C...labels for antiparticle decay
+ IF (LA .LT. 0 .AND. L .GT. 18) THEN
+ DO J=1,ND
+ LL(J) = LBARP(LL(J))
+ ENDDO
+ ENDIF
+
+ END
+
+
+ SUBROUTINE PO_ALTRA(GA,BGX,BGY,BGZ,PCX,PCY,PCZ,EC,P,PX,PY,PZ,E)
+C*********************************************************************
+C
+C arbitrary Lorentz transformation
+C
+C (taken from PHOJET v1.12, R.E. 08/98)
+C
+C*********************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ SAVE
+
+ EP=PCX*BGX+PCY*BGY+PCZ*BGZ
+ PE=EP/(GA+1.D0)+EC
+ PX=PCX+BGX*PE
+ PY=PCY+BGY*PE
+ PZ=PCZ+BGZ*PE
+ P=SQRT(PX*PX+PY*PY+PZ*PZ)
+ E=GA*EC+EP
+
+ END
+
+
+ SUBROUTINE PO_TRANS(XO,YO,ZO,CDE,SDE,CFE,SFE,X,Y,Z)
+C**********************************************************************
+C
+C rotation of coordinate frame (1) de rotation around y axis
+C (2) fe rotation around z axis
+C
+C (taken from PHOJET v1.12, R.E. 08/98)
+C
+C**********************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ SAVE
+
+ X= CDE*CFE*XO-SFE*YO+SDE*CFE*ZO
+ Y= CDE*SFE*XO+CFE*YO+SDE*SFE*ZO
+ Z=-SDE *XO +CDE *ZO
+
+ END
+
+
+ SUBROUTINE PO_SELSX2(XS1,XS2,XMIN,XMAX,AS1,AS2,IREJ)
+C***********************************************************************
+C
+C select x values of soft string ends using PO_RNDBET
+C
+C (taken from PHOJET v1.12, R.E. 08/98)
+C
+C***********************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+
+ DIMENSION XS1(2),XS2(2)
+ DIMENSION XMIN(2),XMAX(2)
+
+ IREJ = 0
+
+ GAM1 = +1.5D0 + 1.D0
+ GAM2 = -0.5D0 + 1.D0
+ BET1 = -0.5D0 + 1.D0
+ BET2 = -0.5D0 + 1.D0
+
+ ITRY0 = 0
+ DO 100 I=1,100
+
+ ITRY1 = 0
+ 10 CONTINUE
+ X1 = PO_RNDBET(GAM1,BET1)
+ ITRY1 = ITRY1+1
+ IF(ITRY1.GE.50) THEN
+ IREJ = 1
+ RETURN
+ ENDIF
+ IF((X1.LE.XMIN(1)).OR.(X1.GE.XMAX(1))) GOTO 10
+
+ ITRY2 = 0
+ 11 CONTINUE
+ X2 = PO_RNDBET(GAM2,BET2)
+ ITRY2 = ITRY2+1
+ IF(ITRY2.GE.50) THEN
+ IREJ = 2
+ RETURN
+ ENDIF
+ IF((X2.LE.XMIN(2)).OR.(X2.GE.XMAX(2))) GOTO 11
+
+ X3 = 1.D0 - X1
+ X4 = 1.D0 - X2
+ IF(X1*X2.GT.AS1) THEN
+ IF(X3*X4.GT.AS2) GOTO 300
+ ENDIF
+ ITRY0 = ITRY0+1
+
+ 100 CONTINUE
+
+ IREJ = 3
+ RETURN
+
+ 300 CONTINUE
+
+ XS1(1) = X1
+ XS1(2) = X3
+
+ XS2(1) = X2
+ XS2(2) = X4
+
+ END
+
+
+ DOUBLE PRECISION FUNCTION PO_RNDBET(GAM,ETA)
+C********************************************************************
+C
+C random number generation from beta
+C distribution in region 0 < X < 1.
+C F(X) = X**(GAM-1.)*(1.-X)**(ETA-1)*GAMM(ETA+GAM) / (GAMM(GAM
+C *GAMM(ETA))
+C
+C (taken from PHOJET v1.12, R.E. 08/98)
+C
+C********************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+
+ Y = PO_RNDGAM(1.D0,GAM)
+ Z = PO_RNDGAM(1.D0,ETA)
+ PO_RNDBET = Y/(Y+Z)
+
+ END
+
+
+ DOUBLE PRECISION FUNCTION PO_RNDGAM(ALAM,ETA)
+C********************************************************************
+C
+C random number selection from gamma distribution
+C F(X) = ALAM**ETA*X**(ETA-1)*EXP(-ALAM*X) / GAM(ETA)
+C
+C (taken from PHOJET v1.12, R.E. 08/98)
+C
+C********************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+
+ NCOU=0
+ N = ETA
+ F = ETA - N
+ IF(F.EQ.0.D0) GOTO 20
+ 10 R = RNDM(0)
+ NCOU=NCOU+1
+ IF (NCOU.GE.11) GOTO 20
+ IF(R.LT.F/(F+2.71828D0)) GOTO 30
+ YYY=LOG(RNDM(0)+1.e-7)/F
+ IF(ABS(YYY).GT.50.D0) GOTO 20
+ Y = EXP(YYY)
+ IF(LOG(RNDM(0)+1.D-7).GT.-Y) GOTO 10
+ GOTO 40
+ 20 Y = 0.D0
+ GOTO 50
+ 30 Y = 1.D0-LOG(RNDM(0)+1.D-7)
+ IF(RNDM(0).GT.Y**(F-1.D0)) GOTO 10
+ 40 IF(N.EQ.0) GOTO 70
+ 50 Z = 1.D0
+ DO 60 I = 1,N
+ 60 Z = Z*RNDM(0)
+ Y = Y-LOG(Z+1.D-7)
+ 70 PO_RNDGAM = Y/ALAM
+
+ END
+
+
+ SUBROUTINE lund_frag(SQS,NP)
+C***********************************************************************
+C
+C interface to Lund/Jetset fragmentation
+C
+C (R.E. 08/98)
+C
+C***********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5)
+ SAVE
+
+ DATA init / 0 /
+
+
+ if(init.eq.0) then
+
+C no title page
+
+ MSTU(12) = 0
+
+C define some particles as stable
+
+ MSTJ(22) = 2
+
+C in addition pi0 stable
+
+ KC=LUCOMP(111)
+ MDCY(KC,1)=0
+
+C switch popcorn effect off
+
+ MSTJ(12) = 1
+
+C suppress all warning and error messages
+
+ MSTU(22) = 0
+ MSTU(25) = 0
+
+ init = 1
+
+ endif
+
+
+C set energy dependent parameters
+
+ IF(SQS.LT.2.D0) THEN
+ PARJ(36) = 0.1D0
+ ELSE IF(SQS.LT.4.D0) THEN
+ PARJ(36) = 0.7D0*(SQS-2.D0)/2.D0+0.1D0
+ ELSE
+ PARJ(36) = 0.8D0
+ ENDIF
+
+C fragment string configuration
+
+ II = MSTU(21)
+ MSTU(21) = 1
+ CALL LUEXEC
+ MSTU(21) = II
+
+C event accepted?
+
+ if(MSTU(24).ne.0) then
+ NP = -1
+ return
+ endif
+
+ CALL LUEDIT(1)
+
+ NP = KLU(0,1)
+
+ END
+
+
+ SUBROUTINE lund_put(I,IFL,PX,PY,PZ,EE)
+C***********************************************************************
+C
+C store initial configuration into Lund common block
+C
+C (R.E. 08/98)
+C
+C***********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5)
+ SAVE
+
+ if(IFL.eq.1) then
+ Il = 2
+ else if(IFL.eq.-1) then
+ Il = -2
+ else if(IFL.eq.2) then
+ Il = 1
+ else if(IFL.eq.-2) then
+ Il = -1
+ else if(IFL.eq.11) then
+ Il = 2203
+ else if(IFL.eq.12) then
+ Il = 2101
+ else if(IFL.eq.21) then
+ Il = 2103
+ else if(IFL.eq.22) then
+ Il = 1103
+ else
+ print *,' lund_put: unkown flavor code',IFL
+ endif
+
+ P(I,1) = PX
+ P(I,2) = PY
+ P(I,3) = PZ
+ P(I,4) = EE
+ P(I,5) = (EE-PZ)*(EE+PZ)-PX**2-PY**2
+
+ K(I,1) = 1
+ K(I,2) = Il
+ K(I,3) = 0
+ K(I,4) = 0
+ K(I,5) = 0
+
+ N = I
+
+ END
+
+
+ SUBROUTINE lund_get(I,IFL,PX,PY,PZ,EE,XM)
+C***********************************************************************
+C
+C read final states from Lund common block
+C
+C (R.E. 08/98)
+C
+C***********************************************************************
+
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5)
+ SAVE
+
+ PX = PLU(I,1)
+ PY = PLU(I,2)
+ PZ = PLU(I,3)
+ EE = PLU(I,4)
+ XM = PLU(I,5)
+
+ Il = KLU(I,8)
+
+C convert particle ID
+
+ IFL = ICON_PDG_SIB(Il)
+
+ END
+
+
+
+ INTEGER FUNCTION ICON_PDG_SIB(ID)
+C************************************************************************
+C
+C convert PDG particle codes to SIBYLL particle codes
+C
+C (R.E. 09/97)
+C
+C************************************************************************
+ SAVE
+
+ DIMENSION ITABLE(49)
+ DATA ITABLE /
+ & 22, -11, 11, -13, 13, 111, 211, -211, 321, -321, 130, 310, 2212,
+ & 2112, 12, -12, 14, -14, -99999999, -99999999, 311, -311, 221,
+ & 331, 213, -213, 113, 323, -323, 313, -313, 223, 333, 3222, 3212,
+ & 3112, 3322, 3312, 3122, 2224, 2214, 2114, 1114, 3224, 3214,
+ & 3114, 3324, 3314, 3334 /
+
+ IDPDG = ID
+
+ 100 CONTINUE
+ IDA = ABS(ID)
+
+ IF(IDA.GT.1000) THEN
+ IS = IDA
+ IC = SIGN(1,IDPDG)
+ ELSE
+ IS = IDPDG
+ IC = 1
+ ENDIF
+
+ DO I=1,49
+ IF(IS.EQ.ITABLE(I)) THEN
+ ICON_PDG_SIB = I*IC
+ RETURN
+ ENDIF
+ ENDDO
+
+ IF(IDPDG.EQ.80000) THEN
+ ICON_PDG_SIB = 13
+ ELSE
+ print *,'ICON_PDG_DTU: no particle found for ',IDPDG
+ ICON_PDG_SIB = 0
+ RETURN
+ ENDIF
+
+ END
+
+
+
+ SUBROUTINE PO_MSHELL(PA1,PA2,XM1,XM2,P1,P2)
+C********************************************************************
+C
+C rescaling of momenta of two partons to put both
+C on mass shell
+C
+C input: PA1,PA2 input momentum vectors
+C XM1,2 desired masses of particles afterwards
+C P1,P2 changed momentum vectors
+C
+C (taken from PHOJET 1.12, R.E. 08/98)
+C
+C********************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ SAVE
+
+ PARAMETER ( DEPS = 1.D-5 )
+
+ DIMENSION PA1(4),PA2(4),P1(4),P2(4)
+
+C Lorentz transformation into system CMS
+ PX = PA1(1)+PA2(1)
+ PY = PA1(2)+PA2(2)
+ PZ = PA1(3)+PA2(3)
+ EE = PA1(4)+PA2(4)
+ XMS = EE**2-PX**2-PY**2-PZ**2
+ XMS = SQRT(XMS)
+ BGX = PX/XMS
+ BGY = PY/XMS
+ BGZ = PZ/XMS
+ GAM = EE/XMS
+ CALL PO_ALTRA(GAM,-BGX,-BGY,-BGZ,PA1(1),PA1(2),PA1(3),
+ & PA1(4),PTOT1,P1(1),P1(2),P1(3),P1(4))
+C rotation angles
+ PTOT1 = MAX(DEPS,PTOT1)
+ COD= P1(3)/PTOT1
+ SID= SQRT((1.D0-COD)*(1.D0+COD))
+ COF=1.D0
+ SIF=0.D0
+ IF(PTOT1*SID.GT.1.D-5) THEN
+ COF=P1(1)/(SID*PTOT1)
+ SIF=P1(2)/(SID*PTOT1)
+ ANORF=SQRT(COF*COF+SIF*SIF)
+ COF=COF/ANORF
+ SIF=SIF/ANORF
+ ENDIF
+
+C new CM momentum and energies (for masses XM1,XM2)
+ XM12 = XM1**2
+ XM22 = XM2**2
+ SS = XMS**2
+ PCMP = PO_XLAM(SS,XM12,XM22)/(2.D0*XMS)
+ EE1 = SQRT(XM12+PCMP**2)
+ EE2 = XMS-EE1
+C back rotation
+ CALL PO_TRANS(0.D0,0.D0,PCMP,COD,SID,COF,SIF,XX,YY,ZZ)
+ CALL PO_ALTRA(GAM,BGX,BGY,BGZ,XX,YY,ZZ,EE1,
+ & PTOT1,P1(1),P1(2),P1(3),P1(4))
+ CALL PO_ALTRA(GAM,BGX,BGY,BGZ,-XX,-YY,-ZZ,EE2,
+ & PTOT2,P2(1),P2(2),P2(3),P2(4))
+
+ END
+
+
+ DOUBLE PRECISION FUNCTION PO_XLAM(X,Y,Z)
+C**********************************************************************
+C
+C auxiliary function for two/three particle decay mode
+C (standard LAMBDA**(1/2) function)
+C
+C (taken from PHOJET 1.12, R.E. 08/98)
+C
+C**********************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ SAVE
+
+ YZ=Y-Z
+ XLAM=X*X-2.D0*X*(Y+Z)+YZ*YZ
+ IF(XLAM.LT.0.D0) XLAM=-XLAM
+ PO_XLAM=SQRT(XLAM)
+
+ END
+
+
+
+ SUBROUTINE INITIAL(L0)
+
+c*******************************************************************
+c initialization routine for setting parameters of resonances
+c*******************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ SAVE
+ COMMON /RES_PROP/ AMRES(9),SIG0(9),WIDTH(9),
+ + NAMPRES(0:9)
+ COMMON /RES_PROPp/ AMRESp(9), BGAMMAp(9),WIDTHp(9),
+ + RATIOJp(9),NAMPRESp(0:9)
+ COMMON /RES_PROPn/ AMRESn(9), BGAMMAn(9),WIDTHn(9),
+ + RATIOJn(9),NAMPRESn(0:9)
+ COMMON /S_MASS1/ AM(49), AM2(49)
+ CHARACTER NAMPRESp*6, NAMPRESn*6
+ CHARACTER NAMPRES*6
+
+ if (L0.eq.13) then
+ do i=1,9
+ SIG0(i) = 4.893089117D0/AM2(13)*RATIOJp(i)*BGAMMAp(i)
+ AMRES(i) = AMRESp(i)
+ WIDTH(i) = WIDTHp(i)
+ NAMPRES(i) = NAMPRESp(i)
+ enddo
+ endif
+
+ if (L0.eq.14) then
+ do i=1,9
+ SIG0(i) = 4.893089117D0/AM2(14)*RATIOJn(i)*BGAMMAn(i)
+ AMRES(i) = AMRESn(i)
+ WIDTH(i) = WIDTHn(i)
+ NAMPRES(i) = NAMPRESn(i)
+ enddo
+ endif
+
+ RETURN
+ END
diff --git a/modules/sophia/inpoutput.f b/modules/sophia/inpoutput.f
new file mode 100644
index 0000000000000000000000000000000000000000..17565e04ae21b7f67e26d4984bfd7b8df63400f4
--- /dev/null
+++ b/modules/sophia/inpoutput.f
@@ -0,0 +1,656 @@
+c*****************************************************************************
+c**!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!***
+c**!! IF YOU USE THIS PROGRAM, PLEASE CITE: !!***
+c**!! A.M"ucke, Ralph Engel, J.P.Rachen, R.J.Protheroe and Todor Stanev, !!***
+c**!! 1999, astro-ph/9903478, to appear in Comp.Phys.Commun. !!***
+c**!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!***
+c*****************************************************************************
+c** Further SOPHIA related papers: ***
+c** (1) M"ucke A., et al 1999, astro-ph/9808279, to appear in PASA. ***
+c** (2) M"ucke A., et al 1999, to appear in: Proc. of the ***
+c** 19th Texas Symposium on Relativistic Astrophysics, Paris, France, ***
+c** Dec. 1998. Eds.: J.~Paul, T.~Montmerle \& E.~Aubourg (CEA Saclay) ***
+c** (3) M"ucke A., et al 1999, astro-ph/9905153, to appear in: Proc. of ***
+c** 19th Texas Symposium on Relativistic Astrophysics, Paris, France, ***
+c** Dec. 1998. Eds.: J.~Paul, T.~Montmerle \& E.~Aubourg (CEA Saclay) ***
+c** (4) M"ucke A., et al 1999, to appear in: Proc. of 26th Int.Cosmic Ray ***
+c** Conf. (Salt Lake City, Utah) ***
+c*****************************************************************************
+
+
+c*********************************
+c*** Routines related to output: *
+c*********************************
+
+
+ subroutine LISTDISTR(E0,Dg,Dnum,Dnuma,Dnue,Dnuea,Dp,Dn,Dem,
+ & Dep,nbins,delx)
+
+c*********************************************************************
+c** calculates distribution of energy of given particle to incident **
+c** proton energy; considered particles are: **
+c** photons, protons, neutrons, e-neutrinos, nu-neutrinos **
+c** Note: Dg(),Dnum(),Dnue(),Dp(),Dn(),Dem(),Dep(),Dnuea(),Dnuma() **
+c** gives # of photons per logarithmic bin width: dN/dlog(f) **
+c*********************************************************************
+c** Date: 20/01/98 **
+c** author: A.Muecke **
+c**********************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+
+ COMMON /S_PLIST/ P(2000,5), LLIST(2000), NP, Ideb
+ DIMENSION Dg(201),Dnum(201),Dnue(201),Dp(201),Dn(201)
+ DIMENSION Dem(201),Dep(201),Dnuea(201),Dnuma(201)
+
+ do i=1,201
+ Dg(i) = 0.
+ Dnum(i) = 0.
+ Dnue(i) = 0.
+ Dp(i) = 0.
+ Dn(i) = 0.
+ Dem(i) = 0.
+ Dep(i) = 0.
+ Dnuma(i) = 0.
+ Dnuea(i) = 0.
+ enddo
+
+ xini = -nbins*delx
+c go through LLIST:
+ do 10 i=1,NP
+ LA = abs(LLIST(i))
+ EI = abs(P(i,4))
+ Ep = E0/1.D10
+ r = EI/Ep/1.D10
+ x = log10(r)
+ if (LA.lt.10000) then
+c** gamma ray distribution
+ if (LA.eq.1) then
+ do 20 j=1,nbins
+ x1 = xini+delx*(j-1)
+ x2 = xini+delx*j
+ if (x.ge.x1.and.x.lt.x2) then
+ Dg(j) = Dg(j)+1.D0
+ endif
+ if (x.eq.0.D0) then
+ Dg(nbins) = Dg(nbins)+1.D0
+ endif
+ 20 continue
+ endif
+c** neutron distribution
+ if (LA.eq.14) then
+ do 21 j=1,nbins
+ x1 = xini+delx*(j-1)
+ x2 = xini+delx*j
+ if (x.ge.x1.and.x.lt.x2) then
+ Dn(j) = Dn(j)+1.D0
+ endif
+ if (x.eq.0.D0) then
+ Dn(nbins) = Dn(nbins)+1.D0
+ endif
+ 21 continue
+ endif
+c** proton distribution
+ if (LA.eq.13) then
+ do 22 j=1,nbins
+ x1 = xini+delx*(j-1)
+ x2 = xini+delx*j
+ if (x.ge.x1.and.x.lt.x2) then
+ Dp(j) = Dp(j)+1.D0
+ endif
+ if (x.eq.0.D0) then
+ Dp(nbins) = Dp(nbins)+1.D0
+ endif
+ 22 continue
+ endif
+c** neutrino distribution
+ if (LA.eq.17) then
+ do 23 j=1,nbins
+ x1 = xini+delx*(j-1)
+ x2 = xini+delx*j
+ if (x.ge.x1.and.x.lt.x2) then
+ Dnum(j) = Dnum(j)+1.D0
+ endif
+ if (x.eq.0.D0) then
+ Dnum(nbins) = Dnum(nbins)+1.D0
+ endif
+ 23 continue
+ endif
+
+ if (LA.eq.18) then
+ do 27 j=1,nbins
+ x1 = xini+delx*(j-1)
+ x2 = xini+delx*j
+ if (x.ge.x1.and.x.lt.x2) then
+ Dnuma(j) = Dnuma(j)+1.D0
+ endif
+ if (x.eq.0.D0) then
+ Dnuma(nbins) = Dnuma(nbins)+1.D0
+ endif
+ 27 continue
+ endif
+
+
+ if (LA.eq.15) then
+ do 24 j=1,nbins
+ x1 = xini+delx*(j-1)
+ x2 = xini+delx*j
+ if (x.ge.x1.and.x.lt.x2) then
+ Dnue(j) = Dnue(j)+1.D0
+ endif
+ if (x.eq.0.D0) then
+ Dnue(nbins) = Dnue(nbins)+1.D0
+ endif
+ 24 continue
+ endif
+
+ if (LA.eq.16) then
+ do 28 j=1,nbins
+ x1 = xini+delx*(j-1)
+ x2 = xini+delx*j
+ if (x.ge.x1.and.x.lt.x2) then
+ Dnuea(j) = Dnuea(j)+1.D0
+ endif
+ if (x.eq.0.D0) then
+ Dnuea(nbins) = Dnuea(nbins)+1.D0
+ endif
+ 28 continue
+ endif
+
+c** electron distribution
+ if (LA.eq.3) then
+ do 25 j=1,nbins
+ x1 = xini+delx*(j-1)
+ x2 = xini+delx*j
+ if (x.ge.x1.and.x.lt.x2) then
+ Dem(j) = Dem(j)+1.D0
+ endif
+ if (x.eq.0.D0) then
+ Dem(nbins) = Dem(nbins)+1.D0
+ endif
+ 25 continue
+ endif
+
+c** positron distribution
+ if (LA.eq.2) then
+ do 26 j=1,nbins
+ x1 = xini+delx*(j-1)
+ x2 = xini+delx*j
+ if (x.ge.x1.and.x.lt.x2) then
+ Dep(j) = Dep(j)+1.D0
+ endif
+ if (x.eq.0.D0) then
+ Dep(nbins) = Dep(nbins)+1.D0
+ endif
+ 26 continue
+ endif
+
+ endif
+ 10 continue
+
+ RETURN
+
+ END
+
+ subroutine output(Dg,Dnum,Dnuma,Dnue,Dnuea,Dp,Dn,Dem,Dep,nbins,
+ & ninc,nameinc,delx,Emin,Emax,E0_arr,epsmin,epsmax)
+
+c********************************************************************
+c*** OUTPUT ROUTINE for particle spectra: *******
+c*** considered particles: *******
+c*** photons, protons, neutrons, e-neutrinos, nu-neutrinos, *******
+c*** electron, positron *******
+c*** spectra of each particle stored in separate files *******
+c********************************************************************
+c** Date: 20/02/98 **
+c** author: A.Muecke **
+c**********************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-M)
+ SAVE
+
+ COMMON/input/ tbb,E0,alpha1,alpha2,
+ & epsm1,epsm2,epsb,L0
+
+ DIMENSION Dg(101,201),Dnum(101,201),Dnue(101,201)
+ DIMENSION Dp(101,201),Dn(101,201),Dnuma(101,201),E0_arr(101)
+ DIMENSION Dem(101,201),Dep(101,201),Dnuea(101,201)
+ character*5 particle
+ character*7 spart,fpart
+ character*13 filename
+ character*6 nameinc
+ character mat*20, strnm1*2
+ character mat1*20, strnm11*2
+ character mat2*20, strnm12*2
+
+ 571 format(2(3x,E10.5),3x,I3,5(3x,E10.5),
+ & 3x,I3,3x,E10.5,3x,A10,3x,A10)
+ 572 format(E10.5,3x,2(I3,3x))
+ 573 format(2x,E10.5)
+
+ print*
+ print*,'OUTPUT files:'
+c**********************************************
+c******** GAMMA spectra: **********************
+ particle = 'gamma'
+ filename = nameinc // '.' // particle
+ print*,'filename = ',filename
+ if (L0.eq.13) spart = 'proton'
+ if (L0.eq.14) spart = 'neutron'
+ fpart = 'photon'
+ if (tbb.gt.0.) then
+ target1 = tbb
+ target2 = 0.
+ else
+ target1 = alpha1
+ target2 = alpha2
+ endif
+ open(1,file=filename)
+c... write input parameters:
+ write(1,571) Emin,Emax,ninc,target1,target2,
+ & epsmin,epsb,epsmax,nbins,delx,spart,fpart
+c... nucleon energy loop:
+ do i=1,ninc
+c ... determine j-range = range of energy bins not equal zero
+ jini = 0
+ jfin = 0
+c... particle spectrum loop:
+ do j=1,nbins
+ if (Dg(i,j).gt.0.D0) then
+ jfin = j
+ if (jini.eq.0) jini = j
+ endif
+ enddo
+ nm = jfin-jini+1
+ nm1 = nm+1
+ write(strnm1,'(I2)') nm1
+ mat = '(' // strnm1 // '(5X,E10.4))'
+ nmc = 81
+ nmc2 = 82
+ write(strnm11,'(I2)') nmc2
+ mat1 = '(' // strnm11 // '(5X,E10.4))'
+ nmcf = jfin-jini-80+1
+ nmcf2 = nmcf+1
+ write(strnm12,'(I2)') nmcf2
+ mat2 = '(' // strnm12 // '(5X,E10.4))'
+ if (jfin.gt.0) then
+ write(1,572) E0_arr(i),jini,jfin
+c... values written in one line:
+ if (jfin-jini.lt.80) then
+ write(1,FMT=mat) (Dg(i,jl),jl=jini,jfin)
+ else
+ jfin0 = jini+80
+ write(1,FMT=mat1) (Dg(i,jl),jl=jini,jfin0)
+ write(1,FMT=mat2) (Dg(i,jl),jl=jfin0+1,jfin)
+ endif
+ endif
+ enddo
+ close(1)
+
+c**********************************************
+c******** MU-NEUTRINO spectra: **********************
+ particle = 'muneu'
+ filename = nameinc // '.' // particle
+ print*,'filename = ',filename
+ open(1,file=filename)
+ write(1,571) Emin,Emax,ninc,target1,target2,
+ & epsmin,epsb,epsmax,nbins,delx,spart,fpart
+c... nucleon energy loop:
+ do i=1,ninc
+c ... determine j-range = range of energy bins not equal zero
+ jini = 0
+ jfin = 0
+c... particle spectrum loop:
+ do j=1,nbins
+ if (Dnum(i,j).gt.0.D0) then
+ jfin = j
+ if (jini.eq.0) jini = j
+ endif
+ enddo
+ nm = jfin-jini+1
+ nm1 = nm+1
+ write(strnm1,'(I2)') nm1
+ mat = '(' // strnm1 // '(5X,E10.4))'
+ nmc = 81
+ nmc2 = 82
+ write(strnm11,'(I2)') nmc2
+ mat1 = '(' // strnm11 // '(5X,E10.4))'
+ nmcf = jfin-jini-80+1
+ nmcf2 = nmcf+1
+ write(strnm12,'(I2)') nmcf2
+ mat2 = '(' // strnm12 // '(5X,E10.4))'
+ if (jfin.gt.0) then
+ write(1,572) E0_arr(i),jini,jfin
+c... values written in one line:
+ if (jfin-jini.lt.80) then
+ write(1,FMT=mat) (Dnum(i,jl),jl=jini,jfin)
+ else
+ jfin0 = jini+80
+ write(1,FMT=mat1) (Dnum(i,jl),jl=jini,jfin0)
+ write(1,FMT=mat2) (Dnum(i,jl),jl=jfin0+1,jfin)
+ endif
+ endif
+ enddo
+ close(1)
+
+ particle = 'muane'
+ filename = nameinc // '.' // particle
+ print*,'filename = ',filename
+ open(1,file=filename)
+ write(1,571) Emin,Emax,ninc,target1,target2,
+ & epsmin,epsb,epsmax,nbins,delx,spart,fpart
+c... nucleon energy loop:
+ do i=1,ninc
+c ... determine j-range = range of energy bins not equal zero
+ jini = 0
+ jfin = 0
+c... particle spectrum loop:
+ do j=1,nbins
+ if (Dnuma(i,j).gt.0.D0) then
+ jfin = j
+ if (jini.eq.0) jini = j
+ endif
+ enddo
+ nm = jfin-jini+1
+ nm1 = nm+1
+ write(strnm1,'(I2)') nm1
+ mat = '(' // strnm1 // '(5X,E10.4))'
+ nmc = 81
+ nmc2 = 82
+ write(strnm11,'(I2)') nmc2
+ mat1 = '(' // strnm11 // '(5X,E10.4))'
+ nmcf = jfin-jini-80+1
+ nmcf2 = nmcf+1
+ write(strnm12,'(I2)') nmcf2
+ mat2 = '(' // strnm12 // '(5X,E10.4))'
+ if (jfin.gt.0) then
+ write(1,572) E0_arr(i),jini,jfin
+c... values written in one line:
+ if (jfin-jini.lt.80) then
+ write(1,FMT=mat) (Dnuma(i,jl),jl=jini,jfin)
+ else
+ jfin0 = jini+80
+ write(1,FMT=mat1) (Dnuma(i,jl),jl=jini,jfin0)
+ write(1,FMT=mat2) (Dnuma(i,jl),jl=jfin0+1,jfin)
+ endif
+ endif
+ enddo
+ close(1)
+
+c**********************************************
+c******** ELECTRON NEUTRINO spectra: **********
+ particle = 'e_neu'
+ filename = nameinc // '.' // particle
+ print*,'filename = ',filename
+ open(1,file=filename)
+ write(1,571) Emin,Emax,ninc,target1,target2,
+ & epsmin,epsb,epsmax,nbins,delx,spart,fpart
+c... nucleon energy loop:
+ do i=1,ninc
+c ... determine j-range = range of energy bins not equal zero
+ jini = 0
+ jfin = 0
+c... particle spectrum loop:
+ do j=1,nbins
+ if (Dnue(i,j).gt.0.D0) then
+ jfin = j
+ if (jini.eq.0) jini = j
+ endif
+ enddo
+ nm = jfin-jini+1
+ nm1 = nm+1
+ write(strnm1,'(I2)') nm1
+ mat = '(' // strnm1 // '(5X,E10.4))'
+ nmc = 81
+ nmc2 = 82
+ write(strnm11,'(I2)') nmc2
+ mat1 = '(' // strnm11 // '(5X,E10.4))'
+ nmcf = jfin-jini-80+1
+ nmcf2 = nmcf+1
+ write(strnm12,'(I2)') nmcf2
+ mat2 = '(' // strnm12 // '(5X,E10.4))'
+ if (jfin.gt.0) then
+ write(1,572) E0_arr(i),jini,jfin
+c... values written in one line:
+ if (jfin-jini.lt.80) then
+ write(1,FMT=mat) (Dnue(i,jl),jl=jini,jfin)
+ else
+ jfin0 = jini+80
+ write(1,FMT=mat1) (Dnue(i,jl),jl=jini,jfin0)
+ write(1,FMT=mat2) (Dnue(i,jl),jl=jfin0+1,jfin)
+ endif
+ endif
+ enddo
+ close(1)
+
+ particle = 'eaneu'
+ filename = nameinc // '.' // particle
+ print*,'filename = ',filename
+ open(1,file=filename)
+ write(1,571) Emin,Emax,ninc,target1,target2,
+ & epsmin,epsb,epsmax,nbins,delx,spart,fpart
+c... nucleon energy loop:
+ do i=1,ninc
+c ... determine j-range = range of energy bins not equal zero
+ jini = 0
+ jfin = 0
+c... particle spectrum loop:
+ do j=1,nbins
+ if (Dnuea(i,j).gt.0.D0) then
+ jfin = j
+ if (jini.eq.0) jini = j
+ endif
+ enddo
+ nm = jfin-jini+1
+ nm1 = nm+1
+ write(strnm1,'(I2)') nm1
+ mat = '(' // strnm1 // '(5X,E10.4))'
+ nmc = 81
+ nmc2 = 82
+ write(strnm11,'(I2)') nmc2
+ mat1 = '(' // strnm11 // '(5X,E10.4))'
+ nmcf = jfin-jini-80+1
+ nmcf2 = nmcf+1
+ write(strnm12,'(I2)') nmcf2
+ mat2 = '(' // strnm12 // '(5X,E10.4))'
+ if (jfin.gt.0) then
+ write(1,572) E0_arr(i),jini,jfin
+c... values written in one line:
+ if (jfin-jini.lt.80) then
+ write(1,FMT=mat) (Dnuea(i,jl),jl=jini,jfin)
+ else
+ jfin0 = jini+80
+ write(1,FMT=mat1) (Dnuea(i,jl),jl=jini,jfin0)
+ write(1,FMT=mat2) (Dnuea(i,jl),jl=jfin0+1,jfin)
+ endif
+ endif
+ enddo
+ close(1)
+
+c**********************************************
+c******** ELECTRON spectra: **********************
+ particle = 'elect'
+ filename = nameinc // '.' // particle
+ print*,'filename = ',filename
+ open(1,file=filename)
+ write(1,571) Emin,Emax,ninc,target1,target2,
+ & epsmin,epsb,epsmax,nbins,delx,spart,fpart
+c... nucleon energy loop:
+ do i=1,ninc
+c ... determine j-range = range of energy bins not equal zero
+ jini = 0
+ jfin = 0
+c... particle spectrum loop:
+ do j=1,nbins
+ if (Dem(i,j).gt.0.D0) then
+ jfin = j
+ if (jini.eq.0) jini = j
+ endif
+ enddo
+ nm = jfin-jini+1
+ nm1 = nm+1
+ write(strnm1,'(I2)') nm1
+ mat = '(' // strnm1 // '(5X,E10.4))'
+ nmc = 81
+ nmc2 = 82
+ write(strnm11,'(I2)') nmc2
+ mat1 = '(' // strnm11 // '(5X,E10.4))'
+ nmcf = jfin-jini-80+1
+ nmcf2 = nmcf+1
+ write(strnm12,'(I2)') nmcf2
+ mat2 = '(' // strnm12 // '(5X,E10.4))'
+ if (jfin.gt.0) then
+ write(1,572) E0_arr(i),jini,jfin
+c... values written in one line:
+ if (jfin-jini.lt.80) then
+ write(1,FMT=mat) (Dem(i,jl),jl=jini,jfin)
+ else
+ jfin0 = jini+80
+ write(1,FMT=mat1) (Dem(i,jl),jl=jini,jfin0)
+ write(1,FMT=mat2) (Dem(i,jl),jl=jfin0+1,jfin)
+ endif
+ endif
+ enddo
+ close(1)
+
+c**********************************************
+c******** POSITRON spectra: **********************
+ particle = 'posit'
+ filename = nameinc // '.' // particle
+ print*,'filename = ',filename
+ open(1,file=filename)
+ write(1,571) Emin,Emax,ninc,target1,target2,
+ & epsmin,epsb,epsmax,nbins,delx,spart,fpart
+c... nucleon energy loop:
+ do i=1,ninc
+c ... determine j-range = range of energy bins not equal zero
+ jini = 0
+ jfin = 0
+c... particle spectrum loop:
+ do j=1,nbins
+ if (Dep(i,j).gt.0.D0) then
+ jfin = j
+ if (jini.eq.0) jini = j
+ endif
+ enddo
+ nm = jfin-jini+1
+ nm1 = nm+1
+ write(strnm1,'(I2)') nm1
+ mat = '(' // strnm1 // '(5X,E10.4))'
+ nmc = 81
+ nmc2 = 82
+ write(strnm11,'(I2)') nmc2
+ mat1 = '(' // strnm11 // '(5X,E10.4))'
+ nmcf = jfin-jini-80+1
+ nmcf2 = nmcf+1
+ write(strnm12,'(I2)') nmcf2
+ mat2 = '(' // strnm12 // '(5X,E10.4))'
+ if (jfin.gt.0) then
+ write(1,572) E0_arr(i),jini,jfin
+c... values written in one line:
+ if (jfin-jini.lt.80) then
+ write(1,FMT=mat) (Dep(i,jl),jl=jini,jfin)
+ else
+ jfin0 = jini+80
+ write(1,FMT=mat1) (Dep(i,jl),jl=jini,jfin0)
+ write(1,FMT=mat2) (Dep(i,jl),jl=jfin0+1,jfin)
+ endif
+ endif
+ enddo
+ close(1)
+
+c**********************************************
+c******** PROTON spectra: **********************
+ particle = 'proto'
+ filename = nameinc // '.' // particle
+ print*,'filename = ',filename
+ open(1,file=filename)
+ write(1,571) Emin,Emax,ninc,target1,target2,
+ & epsmin,epsb,epsmax,nbins,delx,spart,fpart
+c... nucleon energy loop:
+ do i=1,ninc
+c ... determine j-range = range of energy bins not equal zero
+ jini = 0
+ jfin = 0
+c... particle spectrum loop:
+ do j=1,nbins
+ if (Dp(i,j).gt.0.D0) then
+ jfin = j
+ if (jini.eq.0) jini = j
+ endif
+ enddo
+ nm = jfin-jini+1
+ nm1 = nm+1
+ write(strnm1,'(I2)') nm1
+ mat = '(' // strnm1 // '(5X,E10.4))'
+ nmc = 81
+ nmc2 = 82
+ write(strnm11,'(I2)') nmc2
+ mat1 = '(' // strnm11 // '(5X,E10.4))'
+ nmcf = jfin-jini-80+1
+ nmcf2 = nmcf+1
+ write(strnm12,'(I2)') nmcf2
+ mat2 = '(' // strnm12 // '(5X,E10.4))'
+ if (jfin.gt.0) then
+ write(1,572) E0_arr(i),jini,jfin
+c... values written in one line:
+ if (jfin-jini.lt.80) then
+ write(1,FMT=mat) (Dp(i,jl),jl=jini,jfin)
+ else
+ jfin0 = jini+80
+ write(1,FMT=mat1) (Dp(i,jl),jl=jini,jfin0)
+ write(1,FMT=mat2) (Dp(i,jl),jl=jfin0+1,jfin)
+ endif
+ endif
+ enddo
+ close(1)
+
+c**********************************************
+c******** NEUTRON spectra: **********************
+ particle = 'neutr'
+ filename = nameinc // '.' // particle
+ print*,'filename = ',filename
+ open(1,file=filename)
+ write(1,571) Emin,Emax,ninc,target1,target2,
+ & epsmin,epsb,epsmax,nbins,delx,spart,fpart
+c... nucleon energy loop:
+ do i=1,ninc
+c ... determine j-range = range of energy bins not equal zero
+ jini = 0
+ jfin = 0
+c... particle spectrum loop:
+ do j=1,nbins
+ if (Dn(i,j).gt.0.D0) then
+ jfin = j
+ if (jini.eq.0) jini = j
+ endif
+ enddo
+ nm = jfin-jini+1
+ nm1 = nm+1
+ write(strnm1,'(I2)') nm1
+ mat = '(' // strnm1 // '(5X,E10.4))'
+ nmc = 81
+ nmc2 = 82
+ write(strnm11,'(I2)') nmc2
+ mat1 = '(' // strnm11 // '(5X,E10.4))'
+ nmcf = jfin-jini-80+1
+ nmcf2 = nmcf+1
+ write(strnm12,'(I2)') nmcf2
+ mat2 = '(' // strnm12 // '(5X,E10.4))'
+ if (jfin.gt.0) then
+ write(1,572) E0_arr(i),jini,jfin
+c... values written in one line:
+ if (jfin-jini.lt.80) then
+ write(1,FMT=mat) (Dn(i,jl),jl=jini,jfin)
+ else
+ jfin0 = jini+80
+ write(1,FMT=mat1) (Dn(i,jl),jl=jini,jfin0)
+ write(1,FMT=mat2) (Dn(i,jl),jl=jfin0+1,jfin)
+ endif
+ endif
+ enddo
+ close(1)
+
+ RETURN
+ END
diff --git a/modules/sophia/jetset74dp.f b/modules/sophia/jetset74dp.f
new file mode 100644
index 0000000000000000000000000000000000000000..1bff7366052912becd862495514e8a1f268dd42e
--- /dev/null
+++ b/modules/sophia/jetset74dp.f
@@ -0,0 +1,11670 @@
+cFrom eng@lepton.bartol.udel.edu
+cDate: Sun, 15 Nov 1998 18:18:44 -0500
+cFrom: Ralph R Engel <eng@lepton.bartol.udel.edu>
+cTo: amuecke@physics.adelaide.edu.au
+cSubject: File: jetset74dp.f
+c
+C
+C WARNING: this file has been changed to double precision,
+C alignment problems made it necessary to change also
+C /LUJETS/, /PYSUBS/, and /PYINT5/
+C
+C*********************************************************************
+C*********************************************************************
+C* **
+C* December 1993 **
+C* **
+C* The Lund Monte Carlo for Jet Fragmentation and e+e- Physics **
+C* **
+C* JETSET version 7.4 **
+C* **
+C* Torbjorn Sjostrand **
+C* Department of theoretical physics 2 **
+C* University of Lund **
+C* Solvegatan 14A, S-223 62 Lund, Sweden **
+C* E-mail torbjorn@thep.lu.se **
+C* phone +46 - 46 - 222 48 16 **
+C* **
+C* LUSHOW is written together with Mats Bengtsson **
+C* **
+C* The latest program version and documentation is found on WWW **
+C* http://thep.lu.se/tf2/staff/torbjorn/Welcome.html **
+C* **
+C* Copyright Torbjorn Sjostrand and CERN, Geneva 1993 **
+C* **
+C*********************************************************************
+C*********************************************************************
+C *
+C List of subprograms in order of appearance, with main purpose *
+C (S = subroutine, F = function, B = block data) *
+C *
+C S LU1ENT to fill one entry (= parton or particle) *
+C S LU2ENT to fill two entries *
+C S LU3ENT to fill three entries *
+C S LU4ENT to fill four entries *
+C S LUJOIN to connect entries with colour flow information *
+C S LUGIVE to fill (or query) commonblock variables *
+C S LUEXEC to administrate fragmentation and decay chain *
+C S LUPREP to rearrange showered partons along strings *
+C S LUSTRF to do string fragmentation of jet system *
+C S LUINDF to do independent fragmentation of one or many jets *
+C S LUDECY to do the decay of a particle *
+C S LUKFDI to select parton and hadron flavours in fragm *
+C S LUPTDI to select transverse momenta in fragm *
+C S LUZDIS to select longitudinal scaling variable in fragm *
+C S LUSHOW to do timelike parton shower evolution *
+C S LUBOEI to include Bose-Einstein effects (crudely) *
+C F ULMASS to give the mass of a particle or parton *
+C S LUNAME to give the name of a particle or parton *
+C F LUCHGE to give three times the electric charge *
+C F LUCOMP to compress standard KF flavour code to internal KC *
+C S LUERRM to write error messages and abort faulty run *
+C F ULALEM to give the alpha_electromagnetic value *
+C F ULALPS to give the alpha_strong value *
+C F ULANGL to give the angle from known x and y components *
+C F RLU to provide a random number generator *
+C S RLUGET to save the state of the random number generator *
+C S RLUSET to set the state of the random number generator *
+C S LUROBO to rotate and/or boost an event *
+C S LUEDIT to remove unwanted entries from record *
+C S LULIST to list event record or particle data *
+C S LULOGO to write a logo for JETSET and PYTHIA *
+C S LUUPDA to update particle data *
+C F KLU to provide integer-valued event information *
+C F PLU to provide real-valued event information *
+C S LUSPHE to perform sphericity analysis *
+C S LUTHRU to perform thrust analysis *
+C S LUCLUS to perform three-dimensional cluster analysis *
+C S LUCELL to perform cluster analysis in (eta, phi, E_T) *
+C S LUJMAS to give high and low jet mass of event *
+C S LUFOWO to give Fox-Wolfram moments *
+C S LUTABU to analyze events, with tabular output *
+C *
+C S LUEEVT to administrate the generation of an e+e- event *
+C S LUXTOT to give the total cross-section at given CM energy *
+C S LURADK to generate initial state photon radiation *
+C S LUXKFL to select flavour of primary qqbar pair *
+C S LUXJET to select (matrix element) jet multiplicity *
+C S LUX3JT to select kinematics of three-jet event *
+C S LUX4JT to select kinematics of four-jet event *
+C S LUXDIF to select angular orientation of event *
+C S LUONIA to perform generation of onium decay to gluons *
+C *
+C S LUHEPC to convert between /LUJETS/ and /HEPEVT/ records *
+C S LUTEST to test the proper functioning of the package *
+C B LUDATA to contain default values and particle data *
+C *
+C*********************************************************************
+
+CDECK ID>, LU1ENT
+ SUBROUTINE LU1ENT(IP,KF,PE,THE,PHI)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to store one parton/particle in commonblock LUJETS.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+
+C...Standard checks.
+ MSTU(28)=0
+ IF(MSTU(12).GE.1) CALL LULIST(0)
+ IPA=MAX(1,IABS(IP))
+ IF(IPA.GT.MSTU(4)) CALL LUERRM(21,
+ &'(LU1ENT:) writing outside LUJETS memory')
+ KC=LUCOMP(KF)
+ IF(KC.EQ.0) CALL LUERRM(12,'(LU1ENT:) unknown flavour code')
+
+C...Find mass. Reset K, P and V vectors.
+ PM=0.
+ IF(MSTU(10).EQ.1) PM=P(IPA,5)
+ IF(MSTU(10).GE.2) PM=ULMASS(KF)
+ DO 100 J=1,5
+ K(IPA,J)=0
+ P(IPA,J)=0.
+ V(IPA,J)=0.
+ 100 CONTINUE
+
+C...Store parton/particle in K and P vectors.
+ K(IPA,1)=1
+ IF(IP.LT.0) K(IPA,1)=2
+ K(IPA,2)=KF
+ P(IPA,5)=PM
+ P(IPA,4)=MAX(PE,PM)
+ PA=SQRT(P(IPA,4)**2-P(IPA,5)**2)
+ P(IPA,1)=PA*SIN(THE)*COS(PHI)
+ P(IPA,2)=PA*SIN(THE)*SIN(PHI)
+ P(IPA,3)=PA*COS(THE)
+
+C...Set N. Optionally fragment/decay.
+ N=IPA
+ IF(IP.EQ.0) CALL LUEXEC
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LU2ENT
+ SUBROUTINE LU2ENT(IP,KF1,KF2,PECM)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to store two partons/particles in their CM frame,
+C...with the first along the +z axis.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+
+C...Standard checks.
+ MSTU(28)=0
+ IF(MSTU(12).GE.1) CALL LULIST(0)
+ IPA=MAX(1,IABS(IP))
+ IF(IPA.GT.MSTU(4)-1) CALL LUERRM(21,
+ &'(LU2ENT:) writing outside LUJETS memory')
+ KC1=LUCOMP(KF1)
+ KC2=LUCOMP(KF2)
+ IF(KC1.EQ.0.OR.KC2.EQ.0) CALL LUERRM(12,
+ &'(LU2ENT:) unknown flavour code')
+
+C...Find masses. Reset K, P and V vectors.
+ PM1=0.
+ IF(MSTU(10).EQ.1) PM1=P(IPA,5)
+ IF(MSTU(10).GE.2) PM1=ULMASS(KF1)
+ PM2=0.
+ IF(MSTU(10).EQ.1) PM2=P(IPA+1,5)
+ IF(MSTU(10).GE.2) PM2=ULMASS(KF2)
+ DO 110 I=IPA,IPA+1
+ DO 100 J=1,5
+ K(I,J)=0
+ P(I,J)=0.
+ V(I,J)=0.
+ 100 CONTINUE
+ 110 CONTINUE
+
+C...Check flavours.
+ KQ1=KCHG(KC1,2)*ISIGN(1,KF1)
+ KQ2=KCHG(KC2,2)*ISIGN(1,KF2)
+ IF(MSTU(19).EQ.1) THEN
+ MSTU(19)=0
+ ELSE
+ IF(KQ1+KQ2.NE.0.AND.KQ1+KQ2.NE.4) CALL LUERRM(2,
+ & '(LU2ENT:) unphysical flavour combination')
+ ENDIF
+ K(IPA,2)=KF1
+ K(IPA+1,2)=KF2
+
+C...Store partons/particles in K vectors for normal case.
+ IF(IP.GE.0) THEN
+ K(IPA,1)=1
+ IF(KQ1.NE.0.AND.KQ2.NE.0) K(IPA,1)=2
+ K(IPA+1,1)=1
+
+C...Store partons in K vectors for parton shower evolution.
+ ELSE
+ K(IPA,1)=3
+ K(IPA+1,1)=3
+ K(IPA,4)=MSTU(5)*(IPA+1)
+ K(IPA,5)=K(IPA,4)
+ K(IPA+1,4)=MSTU(5)*IPA
+ K(IPA+1,5)=K(IPA+1,4)
+ ENDIF
+
+C...Check kinematics and store partons/particles in P vectors.
+ IF(PECM.LE.PM1+PM2) CALL LUERRM(13,
+ &'(LU2ENT:) energy smaller than sum of masses')
+ PA=SQRT(MAX(0.D0,(PECM**2-PM1**2-PM2**2)**2-(2.*PM1*PM2)**2))/
+ &(2.*PECM)
+ P(IPA,3)=PA
+ P(IPA,4)=SQRT(PM1**2+PA**2)
+ P(IPA,5)=PM1
+ P(IPA+1,3)=-PA
+ P(IPA+1,4)=SQRT(PM2**2+PA**2)
+ P(IPA+1,5)=PM2
+
+C...Set N. Optionally fragment/decay.
+ N=IPA+1
+ IF(IP.EQ.0) CALL LUEXEC
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LU3ENT
+ SUBROUTINE LU3ENT(IP,KF1,KF2,KF3,PECM,X1,X3)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to store three partons or particles in their CM frame,
+C...with the first along the +z axis and the third in the (x,z)
+C...plane with x > 0.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+
+C...Standard checks.
+ MSTU(28)=0
+ IF(MSTU(12).GE.1) CALL LULIST(0)
+ IPA=MAX(1,IABS(IP))
+ IF(IPA.GT.MSTU(4)-2) CALL LUERRM(21,
+ &'(LU3ENT:) writing outside LUJETS memory')
+ KC1=LUCOMP(KF1)
+ KC2=LUCOMP(KF2)
+ KC3=LUCOMP(KF3)
+ IF(KC1.EQ.0.OR.KC2.EQ.0.OR.KC3.EQ.0) CALL LUERRM(12,
+ &'(LU3ENT:) unknown flavour code')
+
+C...Find masses. Reset K, P and V vectors.
+ PM1=0.
+ IF(MSTU(10).EQ.1) PM1=P(IPA,5)
+ IF(MSTU(10).GE.2) PM1=ULMASS(KF1)
+ PM2=0.
+ IF(MSTU(10).EQ.1) PM2=P(IPA+1,5)
+ IF(MSTU(10).GE.2) PM2=ULMASS(KF2)
+ PM3=0.
+ IF(MSTU(10).EQ.1) PM3=P(IPA+2,5)
+ IF(MSTU(10).GE.2) PM3=ULMASS(KF3)
+ DO 110 I=IPA,IPA+2
+ DO 100 J=1,5
+ K(I,J)=0
+ P(I,J)=0.
+ V(I,J)=0.
+ 100 CONTINUE
+ 110 CONTINUE
+
+C...Check flavours.
+ KQ1=KCHG(KC1,2)*ISIGN(1,KF1)
+ KQ2=KCHG(KC2,2)*ISIGN(1,KF2)
+ KQ3=KCHG(KC3,2)*ISIGN(1,KF3)
+ IF(MSTU(19).EQ.1) THEN
+ MSTU(19)=0
+ ELSEIF(KQ1.EQ.0.AND.KQ2.EQ.0.AND.KQ3.EQ.0) THEN
+ ELSEIF(KQ1.NE.0.AND.KQ2.EQ.2.AND.(KQ1+KQ3.EQ.0.OR.
+ &KQ1+KQ3.EQ.4)) THEN
+ ELSE
+ CALL LUERRM(2,'(LU3ENT:) unphysical flavour combination')
+ ENDIF
+ K(IPA,2)=KF1
+ K(IPA+1,2)=KF2
+ K(IPA+2,2)=KF3
+
+C...Store partons/particles in K vectors for normal case.
+ IF(IP.GE.0) THEN
+ K(IPA,1)=1
+ IF(KQ1.NE.0.AND.(KQ2.NE.0.OR.KQ3.NE.0)) K(IPA,1)=2
+ K(IPA+1,1)=1
+ IF(KQ2.NE.0.AND.KQ3.NE.0) K(IPA+1,1)=2
+ K(IPA+2,1)=1
+
+C...Store partons in K vectors for parton shower evolution.
+ ELSE
+ K(IPA,1)=3
+ K(IPA+1,1)=3
+ K(IPA+2,1)=3
+ KCS=4
+ IF(KQ1.EQ.-1) KCS=5
+ K(IPA,KCS)=MSTU(5)*(IPA+1)
+ K(IPA,9-KCS)=MSTU(5)*(IPA+2)
+ K(IPA+1,KCS)=MSTU(5)*(IPA+2)
+ K(IPA+1,9-KCS)=MSTU(5)*IPA
+ K(IPA+2,KCS)=MSTU(5)*IPA
+ K(IPA+2,9-KCS)=MSTU(5)*(IPA+1)
+ ENDIF
+
+C...Check kinematics.
+ MKERR=0
+ IF(0.5*X1*PECM.LE.PM1.OR.0.5*(2.-X1-X3)*PECM.LE.PM2.OR.
+ &0.5*X3*PECM.LE.PM3) MKERR=1
+ PA1=SQRT(MAX(1D-10,(0.5*X1*PECM)**2-PM1**2))
+ PA2=SQRT(MAX(1D-10,(0.5*(2.-X1-X3)*PECM)**2-PM2**2))
+ PA3=SQRT(MAX(1D-10,(0.5*X3*PECM)**2-PM3**2))
+ CTHE2=(PA3**2-PA1**2-PA2**2)/(2.*PA1*PA2)
+ CTHE3=(PA2**2-PA1**2-PA3**2)/(2.*PA1*PA3)
+ IF(ABS(CTHE2).GE.1.001.OR.ABS(CTHE3).GE.1.001) MKERR=1
+ CTHE3=MAX(-1.D0,MIN(1.D0,CTHE3))
+ IF(MKERR.NE.0) CALL LUERRM(13,
+ &'(LU3ENT:) unphysical kinematical variable setup')
+
+C...Store partons/particles in P vectors.
+ P(IPA,3)=PA1
+ P(IPA,4)=SQRT(PA1**2+PM1**2)
+ P(IPA,5)=PM1
+ P(IPA+2,1)=PA3*SQRT(1.-CTHE3**2)
+ P(IPA+2,3)=PA3*CTHE3
+ P(IPA+2,4)=SQRT(PA3**2+PM3**2)
+ P(IPA+2,5)=PM3
+ P(IPA+1,1)=-P(IPA+2,1)
+ P(IPA+1,3)=-P(IPA,3)-P(IPA+2,3)
+ P(IPA+1,4)=SQRT(P(IPA+1,1)**2+P(IPA+1,3)**2+PM2**2)
+ P(IPA+1,5)=PM2
+
+C...Set N. Optionally fragment/decay.
+ N=IPA+2
+ IF(IP.EQ.0) CALL LUEXEC
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LU4ENT
+ SUBROUTINE LU4ENT(IP,KF1,KF2,KF3,KF4,PECM,X1,X2,X4,X12,X14)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to store four partons or particles in their CM frame, with
+C...the first along the +z axis, the last in the xz plane with x > 0
+C...and the second having y < 0 and y > 0 with equal probability.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+
+C...Standard checks.
+ MSTU(28)=0
+ IF(MSTU(12).GE.1) CALL LULIST(0)
+ IPA=MAX(1,IABS(IP))
+ IF(IPA.GT.MSTU(4)-3) CALL LUERRM(21,
+ &'(LU4ENT:) writing outside LUJETS momory')
+ KC1=LUCOMP(KF1)
+ KC2=LUCOMP(KF2)
+ KC3=LUCOMP(KF3)
+ KC4=LUCOMP(KF4)
+ IF(KC1.EQ.0.OR.KC2.EQ.0.OR.KC3.EQ.0.OR.KC4.EQ.0) CALL LUERRM(12,
+ &'(LU4ENT:) unknown flavour code')
+
+C...Find masses. Reset K, P and V vectors.
+ PM1=0.
+ IF(MSTU(10).EQ.1) PM1=P(IPA,5)
+ IF(MSTU(10).GE.2) PM1=ULMASS(KF1)
+ PM2=0.
+ IF(MSTU(10).EQ.1) PM2=P(IPA+1,5)
+ IF(MSTU(10).GE.2) PM2=ULMASS(KF2)
+ PM3=0.
+ IF(MSTU(10).EQ.1) PM3=P(IPA+2,5)
+ IF(MSTU(10).GE.2) PM3=ULMASS(KF3)
+ PM4=0.
+ IF(MSTU(10).EQ.1) PM4=P(IPA+3,5)
+ IF(MSTU(10).GE.2) PM4=ULMASS(KF4)
+ DO 110 I=IPA,IPA+3
+ DO 100 J=1,5
+ K(I,J)=0
+ P(I,J)=0.
+ V(I,J)=0.
+ 100 CONTINUE
+ 110 CONTINUE
+
+C...Check flavours.
+ KQ1=KCHG(KC1,2)*ISIGN(1,KF1)
+ KQ2=KCHG(KC2,2)*ISIGN(1,KF2)
+ KQ3=KCHG(KC3,2)*ISIGN(1,KF3)
+ KQ4=KCHG(KC4,2)*ISIGN(1,KF4)
+ IF(MSTU(19).EQ.1) THEN
+ MSTU(19)=0
+ ELSEIF(KQ1.EQ.0.AND.KQ2.EQ.0.AND.KQ3.EQ.0.AND.KQ4.EQ.0) THEN
+ ELSEIF(KQ1.NE.0.AND.KQ2.EQ.2.AND.KQ3.EQ.2.AND.(KQ1+KQ4.EQ.0.OR.
+ &KQ1+KQ4.EQ.4)) THEN
+ ELSEIF(KQ1.NE.0.AND.KQ1+KQ2.EQ.0.AND.KQ3.NE.0.AND.KQ3+KQ4.EQ.0.)
+ &THEN
+ ELSE
+ CALL LUERRM(2,'(LU4ENT:) unphysical flavour combination')
+ ENDIF
+ K(IPA,2)=KF1
+ K(IPA+1,2)=KF2
+ K(IPA+2,2)=KF3
+ K(IPA+3,2)=KF4
+
+C...Store partons/particles in K vectors for normal case.
+ IF(IP.GE.0) THEN
+ K(IPA,1)=1
+ IF(KQ1.NE.0.AND.(KQ2.NE.0.OR.KQ3.NE.0.OR.KQ4.NE.0)) K(IPA,1)=2
+ K(IPA+1,1)=1
+ IF(KQ2.NE.0.AND.KQ1+KQ2.NE.0.AND.(KQ3.NE.0.OR.KQ4.NE.0))
+ & K(IPA+1,1)=2
+ K(IPA+2,1)=1
+ IF(KQ3.NE.0.AND.KQ4.NE.0) K(IPA+2,1)=2
+ K(IPA+3,1)=1
+
+C...Store partons for parton shower evolution from q-g-g-qbar or
+C...g-g-g-g event.
+ ELSEIF(KQ1+KQ2.NE.0) THEN
+ K(IPA,1)=3
+ K(IPA+1,1)=3
+ K(IPA+2,1)=3
+ K(IPA+3,1)=3
+ KCS=4
+ IF(KQ1.EQ.-1) KCS=5
+ K(IPA,KCS)=MSTU(5)*(IPA+1)
+ K(IPA,9-KCS)=MSTU(5)*(IPA+3)
+ K(IPA+1,KCS)=MSTU(5)*(IPA+2)
+ K(IPA+1,9-KCS)=MSTU(5)*IPA
+ K(IPA+2,KCS)=MSTU(5)*(IPA+3)
+ K(IPA+2,9-KCS)=MSTU(5)*(IPA+1)
+ K(IPA+3,KCS)=MSTU(5)*IPA
+ K(IPA+3,9-KCS)=MSTU(5)*(IPA+2)
+
+C...Store partons for parton shower evolution from q-qbar-q-qbar event.
+ ELSE
+ K(IPA,1)=3
+ K(IPA+1,1)=3
+ K(IPA+2,1)=3
+ K(IPA+3,1)=3
+ K(IPA,4)=MSTU(5)*(IPA+1)
+ K(IPA,5)=K(IPA,4)
+ K(IPA+1,4)=MSTU(5)*IPA
+ K(IPA+1,5)=K(IPA+1,4)
+ K(IPA+2,4)=MSTU(5)*(IPA+3)
+ K(IPA+2,5)=K(IPA+2,4)
+ K(IPA+3,4)=MSTU(5)*(IPA+2)
+ K(IPA+3,5)=K(IPA+3,4)
+ ENDIF
+
+C...Check kinematics.
+ MKERR=0
+ IF(0.5*X1*PECM.LE.PM1.OR.0.5*X2*PECM.LE.PM2.OR.0.5*(2.-X1-X2-X4)*
+ &PECM.LE.PM3.OR.0.5*X4*PECM.LE.PM4) MKERR=1
+ PA1=SQRT(MAX(1D-10,(0.5*X1*PECM)**2-PM1**2))
+ PA2=SQRT(MAX(1D-10,(0.5*X2*PECM)**2-PM2**2))
+ PA4=SQRT(MAX(1D-10,(0.5*X4*PECM)**2-PM4**2))
+ X24=X1+X2+X4-1.-X12-X14+(PM3**2-PM1**2-PM2**2-PM4**2)/PECM**2
+ CTHE4=(X1*X4-2.*X14)*PECM**2/(4.*PA1*PA4)
+ IF(ABS(CTHE4).GE.1.002) MKERR=1
+ CTHE4=MAX(-1.D0,MIN(1.D0,CTHE4))
+ STHE4=SQRT(1.-CTHE4**2)
+ CTHE2=(X1*X2-2.*X12)*PECM**2/(4.*PA1*PA2)
+ IF(ABS(CTHE2).GE.1.002) MKERR=1
+ CTHE2=MAX(-1.D0,MIN(1.D0,CTHE2))
+ STHE2=SQRT(1.-CTHE2**2)
+ CPHI2=((X2*X4-2.*X24)*PECM**2-4.*PA2*CTHE2*PA4*CTHE4)/
+ &MAX(1D-8*PECM**2,4.*PA2*STHE2*PA4*STHE4)
+ IF(ABS(CPHI2).GE.1.05) MKERR=1
+ CPHI2=MAX(-1.D0,MIN(1.D0,CPHI2))
+ IF(MKERR.EQ.1) CALL LUERRM(13,
+ &'(LU4ENT:) unphysical kinematical variable setup')
+
+C...Store partons/particles in P vectors.
+ P(IPA,3)=PA1
+ P(IPA,4)=SQRT(PA1**2+PM1**2)
+ P(IPA,5)=PM1
+ P(IPA+3,1)=PA4*STHE4
+ P(IPA+3,3)=PA4*CTHE4
+ P(IPA+3,4)=SQRT(PA4**2+PM4**2)
+ P(IPA+3,5)=PM4
+ P(IPA+1,1)=PA2*STHE2*CPHI2
+ P(IPA+1,2)=PA2*STHE2*SQRT(1.-CPHI2**2)*(-1.)**INT(RLU(0)+0.5)
+ P(IPA+1,3)=PA2*CTHE2
+ P(IPA+1,4)=SQRT(PA2**2+PM2**2)
+ P(IPA+1,5)=PM2
+ P(IPA+2,1)=-P(IPA+1,1)-P(IPA+3,1)
+ P(IPA+2,2)=-P(IPA+1,2)
+ P(IPA+2,3)=-P(IPA,3)-P(IPA+1,3)-P(IPA+3,3)
+ P(IPA+2,4)=SQRT(P(IPA+2,1)**2+P(IPA+2,2)**2+P(IPA+2,3)**2+PM3**2)
+ P(IPA+2,5)=PM3
+
+C...Set N. Optionally fragment/decay.
+ N=IPA+3
+ IF(IP.EQ.0) CALL LUEXEC
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUJOIN
+ SUBROUTINE LUJOIN(NJOIN,IJOIN)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to connect a sequence of partons with colour flow indices,
+C...as required for subsequent shower evolution (or other operations).
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+ DIMENSION IJOIN(*)
+
+C...Check that partons are of right types to be connected.
+ IF(NJOIN.LT.2) GOTO 120
+ KQSUM=0
+ DO 100 IJN=1,NJOIN
+ I=IJOIN(IJN)
+ IF(I.LE.0.OR.I.GT.N) GOTO 120
+ IF(K(I,1).LT.1.OR.K(I,1).GT.3) GOTO 120
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0) GOTO 120
+ KQ=KCHG(KC,2)*ISIGN(1,K(I,2))
+ IF(KQ.EQ.0) GOTO 120
+ IF(IJN.NE.1.AND.IJN.NE.NJOIN.AND.KQ.NE.2) GOTO 120
+ IF(KQ.NE.2) KQSUM=KQSUM+KQ
+ IF(IJN.EQ.1) KQS=KQ
+ 100 CONTINUE
+ IF(KQSUM.NE.0) GOTO 120
+
+C...Connect the partons sequentially (closing for gluon loop).
+ KCS=(9-KQS)/2
+ IF(KQS.EQ.2) KCS=INT(4.5+RLU(0))
+ DO 110 IJN=1,NJOIN
+ I=IJOIN(IJN)
+ K(I,1)=3
+ IF(IJN.NE.1) IP=IJOIN(IJN-1)
+ IF(IJN.EQ.1) IP=IJOIN(NJOIN)
+ IF(IJN.NE.NJOIN) IN=IJOIN(IJN+1)
+ IF(IJN.EQ.NJOIN) IN=IJOIN(1)
+ K(I,KCS)=MSTU(5)*IN
+ K(I,9-KCS)=MSTU(5)*IP
+ IF(IJN.EQ.1.AND.KQS.NE.2) K(I,9-KCS)=0
+ IF(IJN.EQ.NJOIN.AND.KQS.NE.2) K(I,KCS)=0
+ 110 CONTINUE
+
+C...Error exit: no action taken.
+ RETURN
+ 120 CALL LUERRM(12,
+ &'(LUJOIN:) given entries can not be joined by one string')
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUGIVE
+ SUBROUTINE LUGIVE(CHIN)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to set values of commonblock variables (also in PYTHIA!).
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5)
+ COMMON/LUDAT4/CHAF(500)
+ CHARACTER CHAF*8
+ COMMON/LUDATR/MRLU(6),RRLU(100)
+ COMMON/PYSUBS/MSUB(200),KFIN(2,-40:40),CKIN(200),MSEL
+ COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200)
+ COMMON/PYINT1/MINT(400),VINT(400)
+ COMMON/PYINT2/ISET(200),KFPR(200,2),COEF(200,20),ICOL(40,4,2)
+ COMMON/PYINT3/XSFX(2,-40:40),ISIG(1000,3),SIGH(1000)
+ COMMON/PYINT4/WIDP(21:40,0:40),WIDE(21:40,0:40),WIDS(21:40,3)
+ COMMON/PYINT5/XSEC(0:200,3),NGEN(0:200,3)
+ COMMON/PYINT6/PROC(0:200)
+ COMMON/PYINT7/SIGT(0:6,0:6,0:5)
+ CHARACTER PROC*28
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/,/LUDAT3/,/LUDAT4/,/LUDATR/
+ SAVE /PYSUBS/,/PYPARS/,/PYINT1/,/PYINT2/,/PYINT3/,/PYINT4/,
+ &/PYINT5/,/PYINT6/,/PYINT7/
+ CHARACTER CHIN*(*),CHFIX*104,CHBIT*104,CHOLD*8,CHNEW*8,CHOLD2*28,
+ &CHNEW2*28,CHNAM*4,CHVAR(43)*4,CHALP(2)*26,CHIND*8,CHINI*10,
+ &CHINR*16
+ DIMENSION MSVAR(43,8)
+
+C...For each variable to be translated give: name,
+C...integer/real/character, no. of indices, lower&upper index bounds.
+ DATA CHVAR/'N','K','P','V','MSTU','PARU','MSTJ','PARJ','KCHG',
+ &'PMAS','PARF','VCKM','MDCY','MDME','BRAT','KFDP','CHAF','MRLU',
+ &'RRLU','MSEL','MSUB','KFIN','CKIN','MSTP','PARP','MSTI','PARI',
+ &'MINT','VINT','ISET','KFPR','COEF','ICOL','XSFX','ISIG','SIGH',
+ &'WIDP','WIDE','WIDS','NGEN','XSEC','PROC','SIGT'/
+ DATA ((MSVAR(I,J),J=1,8),I=1,43)/ 1,7*0, 1,2,1,4000,1,5,2*0,
+ & 2,2,1,4000,1,5,2*0, 2,2,1,4000,1,5,2*0, 1,1,1,200,4*0,
+ & 2,1,1,200,4*0, 1,1,1,200,4*0, 2,1,1,200,4*0,
+ & 1,2,1,500,1,3,2*0, 2,2,1,500,1,4,2*0, 2,1,1,2000,4*0,
+ & 2,2,1,4,1,4,2*0, 1,2,1,500,1,3,2*0, 1,2,1,2000,1,2,2*0,
+ & 2,1,1,2000,4*0, 1,2,1,2000,1,5,2*0, 3,1,1,500,4*0,
+ & 1,1,1,6,4*0, 2,1,1,100,4*0,
+ & 1,7*0, 1,1,1,200,4*0, 1,2,1,2,-40,40,2*0, 2,1,1,200,4*0,
+ & 1,1,1,200,4*0, 2,1,1,200,4*0, 1,1,1,200,4*0, 2,1,1,200,4*0,
+ & 1,1,1,400,4*0, 2,1,1,400,4*0, 1,1,1,200,4*0,
+ & 1,2,1,200,1,2,2*0, 2,2,1,200,1,20,2*0, 1,3,1,40,1,4,1,2,
+ & 2,2,1,2,-40,40,2*0, 1,2,1,1000,1,3,2*0, 2,1,1,1000,4*0,
+ & 2,2,21,40,0,40,2*0, 2,2,21,40,0,40,2*0, 2,2,21,40,1,3,2*0,
+ & 1,2,0,200,1,3,2*0, 2,2,0,200,1,3,2*0, 4,1,0,200,4*0,
+ & 2,3,0,6,0,6,0,5/
+ DATA CHALP/'abcdefghijklmnopqrstuvwxyz',
+ &'ABCDEFGHIJKLMNOPQRSTUVWXYZ'/
+
+C...Length of character variable. Subdivide it into instructions.
+ IF(MSTU(12).GE.1) CALL LULIST(0)
+ CHBIT=CHIN//' '
+ LBIT=101
+ 100 LBIT=LBIT-1
+ IF(CHBIT(LBIT:LBIT).EQ.' ') GOTO 100
+ LTOT=0
+ DO 110 LCOM=1,LBIT
+ IF(CHBIT(LCOM:LCOM).EQ.' ') GOTO 110
+ LTOT=LTOT+1
+ CHFIX(LTOT:LTOT)=CHBIT(LCOM:LCOM)
+ 110 CONTINUE
+ LLOW=0
+ 120 LHIG=LLOW+1
+ 130 LHIG=LHIG+1
+ IF(LHIG.LE.LTOT.AND.CHFIX(LHIG:LHIG).NE.';') GOTO 130
+ LBIT=LHIG-LLOW-1
+ CHBIT(1:LBIT)=CHFIX(LLOW+1:LHIG-1)
+
+C...Identify commonblock variable.
+ LNAM=1
+ 140 LNAM=LNAM+1
+ IF(CHBIT(LNAM:LNAM).NE.'('.AND.CHBIT(LNAM:LNAM).NE.'='.AND.
+ &LNAM.LE.4) GOTO 140
+ CHNAM=CHBIT(1:LNAM-1)//' '
+ DO 160 LCOM=1,LNAM-1
+ DO 150 LALP=1,26
+ IF(CHNAM(LCOM:LCOM).EQ.CHALP(1)(LALP:LALP)) CHNAM(LCOM:LCOM)=
+ &CHALP(2)(LALP:LALP)
+ 150 CONTINUE
+ 160 CONTINUE
+ IVAR=0
+ DO 170 IV=1,43
+ IF(CHNAM.EQ.CHVAR(IV)) IVAR=IV
+ 170 CONTINUE
+ IF(IVAR.EQ.0) THEN
+ CALL LUERRM(18,'(LUGIVE:) do not recognize variable '//CHNAM)
+ LLOW=LHIG
+ IF(LLOW.LT.LTOT) GOTO 120
+ RETURN
+ ENDIF
+
+C...Identify any indices.
+ I1=0
+ I2=0
+ I3=0
+ NINDX=0
+ IF(CHBIT(LNAM:LNAM).EQ.'(') THEN
+ LIND=LNAM
+ 180 LIND=LIND+1
+ IF(CHBIT(LIND:LIND).NE.')'.AND.CHBIT(LIND:LIND).NE.',') GOTO 180
+ CHIND=' '
+ IF((CHBIT(LNAM+1:LNAM+1).EQ.'C'.OR.CHBIT(LNAM+1:LNAM+1).EQ.'c').
+ & AND.(IVAR.EQ.9.OR.IVAR.EQ.10.OR.IVAR.EQ.13.OR.IVAR.EQ.17)) THEN
+ CHIND(LNAM-LIND+11:8)=CHBIT(LNAM+2:LIND-1)
+ READ(CHIND,'(I8)') KF
+ I1=LUCOMP(KF)
+ ELSEIF(CHBIT(LNAM+1:LNAM+1).EQ.'C'.OR.CHBIT(LNAM+1:LNAM+1).EQ.
+ & 'c') THEN
+ CALL LUERRM(18,'(LUGIVE:) not allowed to use C index for '//
+ & CHNAM)
+ LLOW=LHIG
+ IF(LLOW.LT.LTOT) GOTO 120
+ RETURN
+ ELSE
+ CHIND(LNAM-LIND+10:8)=CHBIT(LNAM+1:LIND-1)
+ READ(CHIND,'(I8)') I1
+ ENDIF
+ LNAM=LIND
+ IF(CHBIT(LNAM:LNAM).EQ.')') LNAM=LNAM+1
+ NINDX=1
+ ENDIF
+ IF(CHBIT(LNAM:LNAM).EQ.',') THEN
+ LIND=LNAM
+ 190 LIND=LIND+1
+ IF(CHBIT(LIND:LIND).NE.')'.AND.CHBIT(LIND:LIND).NE.',') GOTO 190
+ CHIND=' '
+ CHIND(LNAM-LIND+10:8)=CHBIT(LNAM+1:LIND-1)
+ READ(CHIND,'(I8)') I2
+ LNAM=LIND
+ IF(CHBIT(LNAM:LNAM).EQ.')') LNAM=LNAM+1
+ NINDX=2
+ ENDIF
+ IF(CHBIT(LNAM:LNAM).EQ.',') THEN
+ LIND=LNAM
+ 200 LIND=LIND+1
+ IF(CHBIT(LIND:LIND).NE.')'.AND.CHBIT(LIND:LIND).NE.',') GOTO 200
+ CHIND=' '
+ CHIND(LNAM-LIND+10:8)=CHBIT(LNAM+1:LIND-1)
+ READ(CHIND,'(I8)') I3
+ LNAM=LIND+1
+ NINDX=3
+ ENDIF
+
+C...Check that indices allowed.
+ IERR=0
+ IF(NINDX.NE.MSVAR(IVAR,2)) IERR=1
+ IF(NINDX.GE.1.AND.(I1.LT.MSVAR(IVAR,3).OR.I1.GT.MSVAR(IVAR,4)))
+ &IERR=2
+ IF(NINDX.GE.2.AND.(I2.LT.MSVAR(IVAR,5).OR.I2.GT.MSVAR(IVAR,6)))
+ &IERR=3
+ IF(NINDX.EQ.3.AND.(I3.LT.MSVAR(IVAR,7).OR.I3.GT.MSVAR(IVAR,8)))
+ &IERR=4
+ IF(CHBIT(LNAM:LNAM).NE.'=') IERR=5
+ IF(IERR.GE.1) THEN
+ CALL LUERRM(18,'(LUGIVE:) unallowed indices for '//
+ & CHBIT(1:LNAM-1))
+ LLOW=LHIG
+ IF(LLOW.LT.LTOT) GOTO 120
+ RETURN
+ ENDIF
+
+C...Save old value of variable.
+ IF(IVAR.EQ.1) THEN
+ IOLD=N
+ ELSEIF(IVAR.EQ.2) THEN
+ IOLD=K(I1,I2)
+ ELSEIF(IVAR.EQ.3) THEN
+ ROLD=P(I1,I2)
+ ELSEIF(IVAR.EQ.4) THEN
+ ROLD=V(I1,I2)
+ ELSEIF(IVAR.EQ.5) THEN
+ IOLD=MSTU(I1)
+ ELSEIF(IVAR.EQ.6) THEN
+ ROLD=PARU(I1)
+ ELSEIF(IVAR.EQ.7) THEN
+ IOLD=MSTJ(I1)
+ ELSEIF(IVAR.EQ.8) THEN
+ ROLD=PARJ(I1)
+ ELSEIF(IVAR.EQ.9) THEN
+ IOLD=KCHG(I1,I2)
+ ELSEIF(IVAR.EQ.10) THEN
+ ROLD=PMAS(I1,I2)
+ ELSEIF(IVAR.EQ.11) THEN
+ ROLD=PARF(I1)
+ ELSEIF(IVAR.EQ.12) THEN
+ ROLD=VCKM(I1,I2)
+ ELSEIF(IVAR.EQ.13) THEN
+ IOLD=MDCY(I1,I2)
+ ELSEIF(IVAR.EQ.14) THEN
+ IOLD=MDME(I1,I2)
+ ELSEIF(IVAR.EQ.15) THEN
+ ROLD=BRAT(I1)
+ ELSEIF(IVAR.EQ.16) THEN
+ IOLD=KFDP(I1,I2)
+ ELSEIF(IVAR.EQ.17) THEN
+ CHOLD=CHAF(I1)
+ ELSEIF(IVAR.EQ.18) THEN
+ IOLD=MRLU(I1)
+ ELSEIF(IVAR.EQ.19) THEN
+ ROLD=RRLU(I1)
+ ELSEIF(IVAR.EQ.20) THEN
+ IOLD=MSEL
+ ELSEIF(IVAR.EQ.21) THEN
+ IOLD=MSUB(I1)
+ ELSEIF(IVAR.EQ.22) THEN
+ IOLD=KFIN(I1,I2)
+ ELSEIF(IVAR.EQ.23) THEN
+ ROLD=CKIN(I1)
+ ELSEIF(IVAR.EQ.24) THEN
+ IOLD=MSTP(I1)
+ ELSEIF(IVAR.EQ.25) THEN
+ ROLD=PARP(I1)
+ ELSEIF(IVAR.EQ.26) THEN
+ IOLD=MSTI(I1)
+ ELSEIF(IVAR.EQ.27) THEN
+ ROLD=PARI(I1)
+ ELSEIF(IVAR.EQ.28) THEN
+ IOLD=MINT(I1)
+ ELSEIF(IVAR.EQ.29) THEN
+ ROLD=VINT(I1)
+ ELSEIF(IVAR.EQ.30) THEN
+ IOLD=ISET(I1)
+ ELSEIF(IVAR.EQ.31) THEN
+ IOLD=KFPR(I1,I2)
+ ELSEIF(IVAR.EQ.32) THEN
+ ROLD=COEF(I1,I2)
+ ELSEIF(IVAR.EQ.33) THEN
+ IOLD=ICOL(I1,I2,I3)
+ ELSEIF(IVAR.EQ.34) THEN
+ ROLD=XSFX(I1,I2)
+ ELSEIF(IVAR.EQ.35) THEN
+ IOLD=ISIG(I1,I2)
+ ELSEIF(IVAR.EQ.36) THEN
+ ROLD=SIGH(I1)
+ ELSEIF(IVAR.EQ.37) THEN
+ ROLD=WIDP(I1,I2)
+ ELSEIF(IVAR.EQ.38) THEN
+ ROLD=WIDE(I1,I2)
+ ELSEIF(IVAR.EQ.39) THEN
+ ROLD=WIDS(I1,I2)
+ ELSEIF(IVAR.EQ.40) THEN
+ IOLD=NGEN(I1,I2)
+ ELSEIF(IVAR.EQ.41) THEN
+ ROLD=XSEC(I1,I2)
+ ELSEIF(IVAR.EQ.42) THEN
+ CHOLD2=PROC(I1)
+ ELSEIF(IVAR.EQ.43) THEN
+ ROLD=SIGT(I1,I2,I3)
+ ENDIF
+
+C...Print current value of variable. Loop back.
+ IF(LNAM.GE.LBIT) THEN
+ CHBIT(LNAM:14)=' '
+ CHBIT(15:60)=' has the value '
+ IF(MSVAR(IVAR,1).EQ.1) THEN
+ WRITE(CHBIT(51:60),'(I10)') IOLD
+ ELSEIF(MSVAR(IVAR,1).EQ.2) THEN
+ WRITE(CHBIT(47:60),'(F14.5)') ROLD
+ ELSEIF(MSVAR(IVAR,1).EQ.3) THEN
+ CHBIT(53:60)=CHOLD
+ ELSE
+ CHBIT(33:60)=CHOLD
+ ENDIF
+ IF(MSTU(13).GE.1) WRITE(MSTU(11),5000) CHBIT(1:60)
+ LLOW=LHIG
+ IF(LLOW.LT.LTOT) GOTO 120
+ RETURN
+ ENDIF
+
+C...Read in new variable value.
+ IF(MSVAR(IVAR,1).EQ.1) THEN
+ CHINI=' '
+ CHINI(LNAM-LBIT+11:10)=CHBIT(LNAM+1:LBIT)
+ READ(CHINI,'(I10)') INEW
+ ELSEIF(MSVAR(IVAR,1).EQ.2) THEN
+ CHINR=' '
+ CHINR(LNAM-LBIT+17:16)=CHBIT(LNAM+1:LBIT)
+ READ(CHINR,'(F16.2)') RNEW
+ ELSEIF(MSVAR(IVAR,1).EQ.3) THEN
+ CHNEW=CHBIT(LNAM+1:LBIT)//' '
+ ELSE
+ CHNEW2=CHBIT(LNAM+1:LBIT)//' '
+ ENDIF
+
+C...Store new variable value.
+ IF(IVAR.EQ.1) THEN
+ N=INEW
+ ELSEIF(IVAR.EQ.2) THEN
+ K(I1,I2)=INEW
+ ELSEIF(IVAR.EQ.3) THEN
+ P(I1,I2)=RNEW
+ ELSEIF(IVAR.EQ.4) THEN
+ V(I1,I2)=RNEW
+ ELSEIF(IVAR.EQ.5) THEN
+ MSTU(I1)=INEW
+ ELSEIF(IVAR.EQ.6) THEN
+ PARU(I1)=RNEW
+ ELSEIF(IVAR.EQ.7) THEN
+ MSTJ(I1)=INEW
+ ELSEIF(IVAR.EQ.8) THEN
+ PARJ(I1)=RNEW
+ ELSEIF(IVAR.EQ.9) THEN
+ KCHG(I1,I2)=INEW
+ ELSEIF(IVAR.EQ.10) THEN
+ PMAS(I1,I2)=RNEW
+ ELSEIF(IVAR.EQ.11) THEN
+ PARF(I1)=RNEW
+ ELSEIF(IVAR.EQ.12) THEN
+ VCKM(I1,I2)=RNEW
+ ELSEIF(IVAR.EQ.13) THEN
+ MDCY(I1,I2)=INEW
+ ELSEIF(IVAR.EQ.14) THEN
+ MDME(I1,I2)=INEW
+ ELSEIF(IVAR.EQ.15) THEN
+ BRAT(I1)=RNEW
+ ELSEIF(IVAR.EQ.16) THEN
+ KFDP(I1,I2)=INEW
+ ELSEIF(IVAR.EQ.17) THEN
+ CHAF(I1)=CHNEW
+ ELSEIF(IVAR.EQ.18) THEN
+ MRLU(I1)=INEW
+ ELSEIF(IVAR.EQ.19) THEN
+ RRLU(I1)=RNEW
+ ELSEIF(IVAR.EQ.20) THEN
+ MSEL=INEW
+ ELSEIF(IVAR.EQ.21) THEN
+ MSUB(I1)=INEW
+ ELSEIF(IVAR.EQ.22) THEN
+ KFIN(I1,I2)=INEW
+ ELSEIF(IVAR.EQ.23) THEN
+ CKIN(I1)=RNEW
+ ELSEIF(IVAR.EQ.24) THEN
+ MSTP(I1)=INEW
+ ELSEIF(IVAR.EQ.25) THEN
+ PARP(I1)=RNEW
+ ELSEIF(IVAR.EQ.26) THEN
+ MSTI(I1)=INEW
+ ELSEIF(IVAR.EQ.27) THEN
+ PARI(I1)=RNEW
+ ELSEIF(IVAR.EQ.28) THEN
+ MINT(I1)=INEW
+ ELSEIF(IVAR.EQ.29) THEN
+ VINT(I1)=RNEW
+ ELSEIF(IVAR.EQ.30) THEN
+ ISET(I1)=INEW
+ ELSEIF(IVAR.EQ.31) THEN
+ KFPR(I1,I2)=INEW
+ ELSEIF(IVAR.EQ.32) THEN
+ COEF(I1,I2)=RNEW
+ ELSEIF(IVAR.EQ.33) THEN
+ ICOL(I1,I2,I3)=INEW
+ ELSEIF(IVAR.EQ.34) THEN
+ XSFX(I1,I2)=RNEW
+ ELSEIF(IVAR.EQ.35) THEN
+ ISIG(I1,I2)=INEW
+ ELSEIF(IVAR.EQ.36) THEN
+ SIGH(I1)=RNEW
+ ELSEIF(IVAR.EQ.37) THEN
+ WIDP(I1,I2)=RNEW
+ ELSEIF(IVAR.EQ.38) THEN
+ WIDE(I1,I2)=RNEW
+ ELSEIF(IVAR.EQ.39) THEN
+ WIDS(I1,I2)=RNEW
+ ELSEIF(IVAR.EQ.40) THEN
+ NGEN(I1,I2)=INEW
+ ELSEIF(IVAR.EQ.41) THEN
+ XSEC(I1,I2)=RNEW
+ ELSEIF(IVAR.EQ.42) THEN
+ PROC(I1)=CHNEW2
+ ELSEIF(IVAR.EQ.43) THEN
+ SIGT(I1,I2,I3)=RNEW
+ ENDIF
+
+C...Write old and new value. Loop back.
+ CHBIT(LNAM:14)=' '
+ CHBIT(15:60)=' changed from to '
+ IF(MSVAR(IVAR,1).EQ.1) THEN
+ WRITE(CHBIT(33:42),'(I10)') IOLD
+ WRITE(CHBIT(51:60),'(I10)') INEW
+ IF(MSTU(13).GE.1) WRITE(MSTU(11),5000) CHBIT(1:60)
+ ELSEIF(MSVAR(IVAR,1).EQ.2) THEN
+ WRITE(CHBIT(29:42),'(F14.5)') ROLD
+ WRITE(CHBIT(47:60),'(F14.5)') RNEW
+ IF(MSTU(13).GE.1) WRITE(MSTU(11),5000) CHBIT(1:60)
+ ELSEIF(MSVAR(IVAR,1).EQ.3) THEN
+ CHBIT(35:42)=CHOLD
+ CHBIT(53:60)=CHNEW
+ IF(MSTU(13).GE.1) WRITE(MSTU(11),5000) CHBIT(1:60)
+ ELSE
+ CHBIT(15:88)=' changed from '//CHOLD2//' to '//CHNEW2
+ IF(MSTU(13).GE.1) WRITE(MSTU(11),5100) CHBIT(1:88)
+ ENDIF
+ LLOW=LHIG
+ IF(LLOW.LT.LTOT) GOTO 120
+
+C...Format statement for output on unit MSTU(11) (by default 6).
+ 5000 FORMAT(5X,A60)
+ 5100 FORMAT(5X,A88)
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUEXEC
+ SUBROUTINE LUEXEC
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to administrate the fragmentation and decay chain.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/,/LUDAT3/
+ DIMENSION PS(2,6)
+
+C...Initialize and reset.
+ MSTU(24)=0
+ IF(MSTU(12).GE.1) CALL LULIST(0)
+ MSTU(31)=MSTU(31)+1
+ MSTU(1)=0
+ MSTU(2)=0
+ MSTU(3)=0
+ IF(MSTU(17).LE.0) MSTU(90)=0
+ MCONS=1
+
+C...Sum up momentum, energy and charge for starting entries.
+ NSAV=N
+ DO 110 I=1,2
+ DO 100 J=1,6
+ PS(I,J)=0.
+ 100 CONTINUE
+ 110 CONTINUE
+ DO 130 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 130
+ DO 120 J=1,4
+ PS(1,J)=PS(1,J)+P(I,J)
+ 120 CONTINUE
+ PS(1,6)=PS(1,6)+LUCHGE(K(I,2))
+ 130 CONTINUE
+ PARU(21)=PS(1,4)
+
+C...Prepare system for subsequent fragmentation/decay.
+ CALL LUPREP(0)
+
+C...Loop through jet fragmentation and particle decays.
+ MBE=0
+ 140 MBE=MBE+1
+ IP=0
+ 150 IP=IP+1
+ KC=0
+ IF(K(IP,1).GT.0.AND.K(IP,1).LE.10) KC=LUCOMP(K(IP,2))
+ IF(KC.EQ.0) THEN
+
+C...Particle decay if unstable and allowed. Save long-lived particle
+C...decays until second pass after Bose-Einstein effects.
+ ELSEIF(KCHG(KC,2).EQ.0) THEN
+ IF(MSTJ(21).GE.1.AND.MDCY(KC,1).GE.1.AND.(MSTJ(51).LE.0.OR.MBE
+ & .EQ.2.OR.PMAS(KC,2).GE.PARJ(91).OR.IABS(K(IP,2)).EQ.311))
+ & CALL LUDECY(IP)
+
+C...Decay products may develop a shower.
+ IF(MSTJ(92).GT.0) THEN
+ IP1=MSTJ(92)
+ QMAX=SQRT(MAX(0.D0,(P(IP1,4)+P(IP1+1,4))**2-(P(IP1,1)+P(IP1+1,
+ & 1))**2-(P(IP1,2)+P(IP1+1,2))**2-(P(IP1,3)+P(IP1+1,3))**2))
+ CALL LUSHOW(IP1,IP1+1,QMAX)
+ CALL LUPREP(IP1)
+ MSTJ(92)=0
+ ELSEIF(MSTJ(92).LT.0) THEN
+ IP1=-MSTJ(92)
+ CALL LUSHOW(IP1,-3,P(IP,5))
+ CALL LUPREP(IP1)
+ MSTJ(92)=0
+ ENDIF
+
+C...Jet fragmentation: string or independent fragmentation.
+ ELSEIF(K(IP,1).EQ.1.OR.K(IP,1).EQ.2) THEN
+ MFRAG=MSTJ(1)
+ IF(MFRAG.GE.1.AND.K(IP,1).EQ.1) MFRAG=2
+ IF(MSTJ(21).GE.2.AND.K(IP,1).EQ.2.AND.N.GT.IP) THEN
+ IF(K(IP+1,1).EQ.1.AND.K(IP+1,3).EQ.K(IP,3).AND.
+ & K(IP,3).GT.0.AND.K(IP,3).LT.IP) THEN
+ IF(KCHG(LUCOMP(K(K(IP,3),2)),2).EQ.0) MFRAG=MIN(1,MFRAG)
+ ENDIF
+ ENDIF
+ IF(MFRAG.EQ.1) CALL LUSTRF(IP)
+ IF(MFRAG.EQ.2) CALL LUINDF(IP)
+ IF(MFRAG.EQ.2.AND.K(IP,1).EQ.1) MCONS=0
+ IF(MFRAG.EQ.2.AND.(MSTJ(3).LE.0.OR.MOD(MSTJ(3),5).EQ.0)) MCONS=0
+ ENDIF
+
+C...Loop back if enough space left in LUJETS and no error abort.
+ IF(MSTU(24).NE.0.AND.MSTU(21).GE.2) THEN
+ ELSEIF(IP.LT.N.AND.N.LT.MSTU(4)-20-MSTU(32)) THEN
+ GOTO 150
+ ELSEIF(IP.LT.N) THEN
+ CALL LUERRM(11,'(LUEXEC:) no more memory left in LUJETS')
+ ENDIF
+
+C...Include simple Bose-Einstein effect parametrization if desired.
+ IF(MBE.EQ.1.AND.MSTJ(51).GE.1) THEN
+ CALL LUBOEI(NSAV)
+ GOTO 140
+ ENDIF
+
+C...Check that momentum, energy and charge were conserved.
+ DO 170 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 170
+ DO 160 J=1,4
+ PS(2,J)=PS(2,J)+P(I,J)
+ 160 CONTINUE
+ PS(2,6)=PS(2,6)+LUCHGE(K(I,2))
+ 170 CONTINUE
+ PDEV=(ABS(PS(2,1)-PS(1,1))+ABS(PS(2,2)-PS(1,2))+ABS(PS(2,3)-
+ &PS(1,3))+ABS(PS(2,4)-PS(1,4)))/(1.+ABS(PS(2,4))+ABS(PS(1,4)))
+ IF(MCONS.EQ.1.AND.PDEV.GT.PARU(11)) CALL LUERRM(15,
+ &'(LUEXEC:) four-momentum was not conserved')
+ IF(MCONS.EQ.1.AND.ABS(PS(2,6)-PS(1,6)).GT.0.1) CALL LUERRM(15,
+ &'(LUEXEC:) charge was not conserved')
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUPREP
+ SUBROUTINE LUPREP(IP)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to rearrange partons along strings, to allow small systems
+C...to collapse into one or two particles and to check flavours.
+C IMPLICIT DOUBLE PRECISION(D)
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/,/LUDAT3/
+ DIMENSION DPS(5),DPC(5),UE(3)
+
+C...Rearrange parton shower product listing along strings: begin loop.
+ I1=N
+ DO 130 MQGST=1,2
+ DO 120 I=MAX(1,IP),N
+ IF(K(I,1).NE.3) GOTO 120
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0) GOTO 120
+ KQ=KCHG(KC,2)
+ IF(KQ.EQ.0.OR.(MQGST.EQ.1.AND.KQ.EQ.2)) GOTO 120
+
+C...Pick up loose string end.
+ KCS=4
+ IF(KQ*ISIGN(1,K(I,2)).LT.0) KCS=5
+ IA=I
+ NSTP=0
+ 100 NSTP=NSTP+1
+ IF(NSTP.GT.4*N) THEN
+ CALL LUERRM(14,'(LUPREP:) caught in infinite loop')
+ RETURN
+ ENDIF
+
+C...Copy undecayed parton.
+ IF(K(IA,1).EQ.3) THEN
+ IF(I1.GE.MSTU(4)-MSTU(32)-5) THEN
+ CALL LUERRM(11,'(LUPREP:) no more memory left in LUJETS')
+ RETURN
+ ENDIF
+ I1=I1+1
+ K(I1,1)=2
+ IF(NSTP.GE.2.AND.IABS(K(IA,2)).NE.21) K(I1,1)=1
+ K(I1,2)=K(IA,2)
+ K(I1,3)=IA
+ K(I1,4)=0
+ K(I1,5)=0
+ DO 110 J=1,5
+ P(I1,J)=P(IA,J)
+ V(I1,J)=V(IA,J)
+ 110 CONTINUE
+ K(IA,1)=K(IA,1)+10
+ IF(K(I1,1).EQ.1) GOTO 120
+ ENDIF
+
+C...Go to next parton in colour space.
+ IB=IA
+ IF(MOD(K(IB,KCS)/MSTU(5)**2,2).EQ.0.AND.MOD(K(IB,KCS),MSTU(5))
+ &.NE.0) THEN
+ IA=MOD(K(IB,KCS),MSTU(5))
+ K(IB,KCS)=K(IB,KCS)+MSTU(5)**2
+ MREV=0
+ ELSE
+ IF(K(IB,KCS).GE.2*MSTU(5)**2.OR.MOD(K(IB,KCS)/MSTU(5),MSTU(5))
+ & .EQ.0) KCS=9-KCS
+ IA=MOD(K(IB,KCS)/MSTU(5),MSTU(5))
+ K(IB,KCS)=K(IB,KCS)+2*MSTU(5)**2
+ MREV=1
+ ENDIF
+ IF(IA.LE.0.OR.IA.GT.N) THEN
+ CALL LUERRM(12,'(LUPREP:) colour rearrangement failed')
+ RETURN
+ ENDIF
+ IF(MOD(K(IA,4)/MSTU(5),MSTU(5)).EQ.IB.OR.MOD(K(IA,5)/MSTU(5),
+ &MSTU(5)).EQ.IB) THEN
+ IF(MREV.EQ.1) KCS=9-KCS
+ IF(MOD(K(IA,KCS)/MSTU(5),MSTU(5)).NE.IB) KCS=9-KCS
+ K(IA,KCS)=K(IA,KCS)+2*MSTU(5)**2
+ ELSE
+ IF(MREV.EQ.0) KCS=9-KCS
+ IF(MOD(K(IA,KCS),MSTU(5)).NE.IB) KCS=9-KCS
+ K(IA,KCS)=K(IA,KCS)+MSTU(5)**2
+ ENDIF
+ IF(IA.NE.I) GOTO 100
+ K(I1,1)=1
+ 120 CONTINUE
+ 130 CONTINUE
+ N=I1
+ IF(MSTJ(14).LT.0) RETURN
+
+C...Find lowest-mass colour singlet jet system, OK if above threshold.
+ IF(MSTJ(14).EQ.0) GOTO 320
+ NS=N
+ 140 NSIN=N-NS
+ PDM=1.+PARJ(32)
+ IC=0
+ DO 190 I=MAX(1,IP),NS
+ IF(K(I,1).NE.1.AND.K(I,1).NE.2) THEN
+ ELSEIF(K(I,1).EQ.2.AND.IC.EQ.0) THEN
+ NSIN=NSIN+1
+ IC=I
+ DO 150 J=1,4
+ DPS(J)=P(I,J)
+ 150 CONTINUE
+ MSTJ(93)=1
+ DPS(5)=ULMASS(K(I,2))
+ ELSEIF(K(I,1).EQ.2) THEN
+ DO 160 J=1,4
+ DPS(J)=DPS(J)+P(I,J)
+ 160 CONTINUE
+ ELSEIF(IC.NE.0.AND.KCHG(LUCOMP(K(I,2)),2).NE.0) THEN
+ DO 170 J=1,4
+ DPS(J)=DPS(J)+P(I,J)
+ 170 CONTINUE
+ MSTJ(93)=1
+ DPS(5)=DPS(5)+ULMASS(K(I,2))
+ PD=SQRT(MAX(0D0,DPS(4)**2-DPS(1)**2-DPS(2)**2-DPS(3)**2))-DPS(5)
+ IF(PD.LT.PDM) THEN
+ PDM=PD
+ DO 180 J=1,5
+ DPC(J)=DPS(J)
+ 180 CONTINUE
+ IC1=IC
+ IC2=I
+ ENDIF
+ IC=0
+ ELSE
+ NSIN=NSIN+1
+ ENDIF
+ 190 CONTINUE
+ IF(PDM.GE.PARJ(32)) GOTO 320
+
+C...Fill small-mass system as cluster.
+ NSAV=N
+ PECM=SQRT(MAX(0D0,DPC(4)**2-DPC(1)**2-DPC(2)**2-DPC(3)**2))
+ K(N+1,1)=11
+ K(N+1,2)=91
+ K(N+1,3)=IC1
+ K(N+1,4)=N+2
+ K(N+1,5)=N+3
+ P(N+1,1)=DPC(1)
+ P(N+1,2)=DPC(2)
+ P(N+1,3)=DPC(3)
+ P(N+1,4)=DPC(4)
+ P(N+1,5)=PECM
+
+C...Form two particles from flavours of lowest-mass system, if feasible.
+ K(N+2,1)=1
+ K(N+3,1)=1
+ IF(MSTU(16).NE.2) THEN
+ K(N+2,3)=N+1
+ K(N+3,3)=N+1
+ ELSE
+ K(N+2,3)=IC1
+ K(N+3,3)=IC2
+ ENDIF
+ K(N+2,4)=0
+ K(N+3,4)=0
+ K(N+2,5)=0
+ K(N+3,5)=0
+ IF(IABS(K(IC1,2)).NE.21) THEN
+ KC1=LUCOMP(K(IC1,2))
+ KC2=LUCOMP(K(IC2,2))
+ IF(KC1.EQ.0.OR.KC2.EQ.0) GOTO 320
+ KQ1=KCHG(KC1,2)*ISIGN(1,K(IC1,2))
+ KQ2=KCHG(KC2,2)*ISIGN(1,K(IC2,2))
+ IF(KQ1+KQ2.NE.0) GOTO 320
+ 200 CALL LUKFDI(K(IC1,2),0,KFLN,K(N+2,2))
+ CALL LUKFDI(K(IC2,2),-KFLN,KFLDMP,K(N+3,2))
+ IF(K(N+2,2).EQ.0.OR.K(N+3,2).EQ.0) GOTO 200
+ ELSE
+ IF(IABS(K(IC2,2)).NE.21) GOTO 320
+ 210 CALL LUKFDI(1+INT((2.+PARJ(2))*RLU(0)),0,KFLN,KFDMP)
+ CALL LUKFDI(KFLN,0,KFLM,K(N+2,2))
+ CALL LUKFDI(-KFLN,-KFLM,KFLDMP,K(N+3,2))
+ IF(K(N+2,2).EQ.0.OR.K(N+3,2).EQ.0) GOTO 210
+ ENDIF
+ P(N+2,5)=ULMASS(K(N+2,2))
+ P(N+3,5)=ULMASS(K(N+3,2))
+ IF(P(N+2,5)+P(N+3,5)+PARJ(64).GE.PECM.AND.NSIN.EQ.1) GOTO 320
+ IF(P(N+2,5)+P(N+3,5)+PARJ(64).GE.PECM) GOTO 260
+
+C...Perform two-particle decay of jet system, if possible.
+ IF(PECM.GE.0.02*DPC(4)) THEN
+ PA=SQRT((PECM**2-(P(N+2,5)+P(N+3,5))**2)*(PECM**2-
+ & (P(N+2,5)-P(N+3,5))**2))/(2.*PECM)
+ UE(3)=2.*RLU(0)-1.
+ PHI=PARU(2)*RLU(0)
+ UE(1)=SQRT(1.-UE(3)**2)*COS(PHI)
+ UE(2)=SQRT(1.-UE(3)**2)*SIN(PHI)
+ DO 220 J=1,3
+ P(N+2,J)=PA*UE(J)
+ P(N+3,J)=-PA*UE(J)
+ 220 CONTINUE
+ P(N+2,4)=SQRT(PA**2+P(N+2,5)**2)
+ P(N+3,4)=SQRT(PA**2+P(N+3,5)**2)
+ MSTU(33)=1
+ CALL LUDBRB(N+2,N+3,0.D0,0.D0,DPC(1)/DPC(4),DPC(2)/DPC(4),
+ & DPC(3)/DPC(4))
+ ELSE
+ NP=0
+ DO 230 I=IC1,IC2
+ IF(K(I,1).EQ.1.OR.K(I,1).EQ.2) NP=NP+1
+ 230 CONTINUE
+ HA=P(IC1,4)*P(IC2,4)-P(IC1,1)*P(IC2,1)-P(IC1,2)*P(IC2,2)-
+ & P(IC1,3)*P(IC2,3)
+ IF(NP.GE.3.OR.HA.LE.1.25*P(IC1,5)*P(IC2,5)) GOTO 260
+ HD1=0.5*(P(N+2,5)**2-P(IC1,5)**2)
+ HD2=0.5*(P(N+3,5)**2-P(IC2,5)**2)
+ HR=SQRT(MAX(0.D0,((HA-HD1-HD2)**2-(P(N+2,5)*P(N+3,5))**2)/
+ & (HA**2-(P(IC1,5)*P(IC2,5))**2)))-1.
+ HC=P(IC1,5)**2+2.*HA+P(IC2,5)**2
+ HK1=((P(IC2,5)**2+HA)*HR+HD1-HD2)/HC
+ HK2=((P(IC1,5)**2+HA)*HR+HD2-HD1)/HC
+ DO 240 J=1,4
+ P(N+2,J)=(1.+HK1)*P(IC1,J)-HK2*P(IC2,J)
+ P(N+3,J)=(1.+HK2)*P(IC2,J)-HK1*P(IC1,J)
+ 240 CONTINUE
+ ENDIF
+ DO 250 J=1,4
+ V(N+1,J)=V(IC1,J)
+ V(N+2,J)=V(IC1,J)
+ V(N+3,J)=V(IC2,J)
+ 250 CONTINUE
+ V(N+1,5)=0.
+ V(N+2,5)=0.
+ V(N+3,5)=0.
+ N=N+3
+ GOTO 300
+
+C...Else form one particle from the flavours available, if possible.
+ 260 K(N+1,5)=N+2
+ IF(IABS(K(IC1,2)).GT.100.AND.IABS(K(IC2,2)).GT.100) THEN
+ GOTO 320
+ ELSEIF(IABS(K(IC1,2)).NE.21) THEN
+ CALL LUKFDI(K(IC1,2),K(IC2,2),KFLDMP,K(N+2,2))
+ ELSE
+ KFLN=1+INT((2.+PARJ(2))*RLU(0))
+ CALL LUKFDI(KFLN,-KFLN,KFLDMP,K(N+2,2))
+ ENDIF
+ IF(K(N+2,2).EQ.0) GOTO 260
+ P(N+2,5)=ULMASS(K(N+2,2))
+
+C...Find parton/particle which combines to largest extra mass.
+ IR=0
+ HA=0.
+ HSM=0.
+ DO 280 MCOMB=1,3
+ IF(IR.NE.0) GOTO 280
+ DO 270 I=MAX(1,IP),N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10.OR.(I.GE.IC1.AND.I.LE.IC2
+ &.AND.K(I,1).GE.1.AND.K(I,1).LE.2)) GOTO 270
+ IF(MCOMB.EQ.1) KCI=LUCOMP(K(I,2))
+ IF(MCOMB.EQ.1.AND.KCI.EQ.0) GOTO 270
+ IF(MCOMB.EQ.1.AND.KCHG(KCI,2).EQ.0.AND.I.LE.NS) GOTO 270
+ IF(MCOMB.EQ.2.AND.IABS(K(I,2)).GT.10.AND.IABS(K(I,2)).LE.100)
+ &GOTO 270
+ HCR=DPC(4)*P(I,4)-DPC(1)*P(I,1)-DPC(2)*P(I,2)-DPC(3)*P(I,3)
+ HSR=2.*HCR+PECM**2-P(N+2,5)**2-2.*P(N+2,5)*P(I,5)
+ IF(HSR.GT.HSM) THEN
+ IR=I
+ HA=HCR
+ HSM=HSR
+ ENDIF
+ 270 CONTINUE
+ 280 CONTINUE
+
+C...Shuffle energy and momentum to put new particle on mass shell.
+ IF(IR.NE.0) THEN
+ HB=PECM**2+HA
+ HC=P(N+2,5)**2+HA
+ HD=P(IR,5)**2+HA
+ HK2=0.5*(HB*SQRT(MAX(0.D0,((HB+HC)**2-4.*(HB+HD)*P(N+2,5)**2)/
+ & (HA**2-(PECM*P(IR,5))**2)))-(HB+HC))/(HB+HD)
+ HK1=(0.5*(P(N+2,5)**2-PECM**2)+HD*HK2)/HB
+ DO 290 J=1,4
+ P(N+2,J)=(1.+HK1)*DPC(J)-HK2*P(IR,J)
+ P(IR,J)=(1.+HK2)*P(IR,J)-HK1*DPC(J)
+ V(N+1,J)=V(IC1,J)
+ V(N+2,J)=V(IC1,J)
+ 290 CONTINUE
+ V(N+1,5)=0.
+ V(N+2,5)=0.
+ N=N+2
+ ELSE
+ CALL LUERRM(3,'(LUPREP:) no match for collapsing cluster')
+ RETURN
+ ENDIF
+
+C...Mark collapsed system and store daughter pointers. Iterate.
+ 300 DO 310 I=IC1,IC2
+ IF((K(I,1).EQ.1.OR.K(I,1).EQ.2).AND.KCHG(LUCOMP(K(I,2)),2).NE.0)
+ &THEN
+ K(I,1)=K(I,1)+10
+ IF(MSTU(16).NE.2) THEN
+ K(I,4)=NSAV+1
+ K(I,5)=NSAV+1
+ ELSE
+ K(I,4)=NSAV+2
+ K(I,5)=N
+ ENDIF
+ ENDIF
+ 310 CONTINUE
+ IF(N.LT.MSTU(4)-MSTU(32)-5) GOTO 140
+
+C...Check flavours and invariant masses in parton systems.
+ 320 NP=0
+ KFN=0
+ KQS=0
+ DO 330 J=1,5
+ DPS(J)=0.
+ 330 CONTINUE
+ DO 360 I=MAX(1,IP),N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 360
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0) GOTO 360
+ KQ=KCHG(KC,2)*ISIGN(1,K(I,2))
+ IF(KQ.EQ.0) GOTO 360
+ NP=NP+1
+ IF(KQ.NE.2) THEN
+ KFN=KFN+1
+ KQS=KQS+KQ
+ MSTJ(93)=1
+ DPS(5)=DPS(5)+ULMASS(K(I,2))
+ ENDIF
+ DO 340 J=1,4
+ DPS(J)=DPS(J)+P(I,J)
+ 340 CONTINUE
+ IF(K(I,1).EQ.1) THEN
+ IF(NP.NE.1.AND.(KFN.EQ.1.OR.KFN.GE.3.OR.KQS.NE.0)) CALL
+ & LUERRM(2,'(LUPREP:) unphysical flavour combination')
+ IF(NP.NE.1.AND.DPS(4)**2-DPS(1)**2-DPS(2)**2-DPS(3)**2.LT.
+ & (0.9*PARJ(32)+DPS(5))**2) CALL LUERRM(3,
+ & '(LUPREP:) too small mass in jet system')
+ NP=0
+ KFN=0
+ KQS=0
+ DO 350 J=1,5
+ DPS(J)=0.
+ 350 CONTINUE
+ ENDIF
+ 360 CONTINUE
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUSTRF
+ SUBROUTINE LUSTRF(IP)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+C...Purpose: to handle the fragmentation of an arbitrary colour singlet
+C...jet system according to the Lund string fragmentation model.
+C IMPLICIT DOUBLE PRECISION(D)
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+ DIMENSION DPS(5),KFL(3),PMQ(3),PX(3),PY(3),GAM(3),IE(2),PR(2),
+ &IN(9),DHM(4),DHG(4),DP(5,5),IRANK(2),MJU(4),IJU(3),PJU(5,5),
+ &TJU(5),KFJH(2),NJS(2),KFJS(2),PJS(4,5),MSTU9T(8),PARU9T(8)
+
+C...Function: four-product of two vectors.
+ FOUR(I,J)=P(I,4)*P(J,4)-P(I,1)*P(J,1)-P(I,2)*P(J,2)-P(I,3)*P(J,3)
+ DFOUR(I,J)=DP(I,4)*DP(J,4)-DP(I,1)*DP(J,1)-DP(I,2)*DP(J,2)-
+ &DP(I,3)*DP(J,3)
+
+C...Reset counters. Identify parton system.
+ MSTJ(91)=0
+ NSAV=N
+ MSTU90=MSTU(90)
+ NP=0
+ KQSUM=0
+ DO 100 J=1,5
+ DPS(J)=0D0
+ 100 CONTINUE
+ MJU(1)=0
+ MJU(2)=0
+ I=IP-1
+ 110 I=I+1
+ IF(I.GT.MIN(N,MSTU(4)-MSTU(32))) THEN
+ CALL LUERRM(12,'(LUSTRF:) failed to reconstruct jet system')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ IF(K(I,1).NE.1.AND.K(I,1).NE.2.AND.K(I,1).NE.41) GOTO 110
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0) GOTO 110
+ KQ=KCHG(KC,2)*ISIGN(1,K(I,2))
+ IF(KQ.EQ.0) GOTO 110
+ IF(N+5*NP+11.GT.MSTU(4)-MSTU(32)-5) THEN
+ CALL LUERRM(11,'(LUSTRF:) no more memory left in LUJETS')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+
+C...Take copy of partons to be considered. Check flavour sum.
+ NP=NP+1
+ DO 120 J=1,5
+ K(N+NP,J)=K(I,J)
+ P(N+NP,J)=P(I,J)
+ IF(J.NE.4) DPS(J)=DPS(J)+P(I,J)
+ 120 CONTINUE
+ DPS(4)=DPS(4)+SQRT(DBLE(P(I,1))**2+DBLE(P(I,2))**2+
+ &DBLE(P(I,3))**2+DBLE(P(I,5))**2)
+ K(N+NP,3)=I
+ IF(KQ.NE.2) KQSUM=KQSUM+KQ
+ IF(K(I,1).EQ.41) THEN
+ KQSUM=KQSUM+2*KQ
+ IF(KQSUM.EQ.KQ) MJU(1)=N+NP
+ IF(KQSUM.NE.KQ) MJU(2)=N+NP
+ ENDIF
+ IF(K(I,1).EQ.2.OR.K(I,1).EQ.41) GOTO 110
+ IF(KQSUM.NE.0) THEN
+ CALL LUERRM(12,'(LUSTRF:) unphysical flavour combination')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+
+C...Boost copied system to CM frame (for better numerical precision).
+ IF(ABS(DPS(3)).LT.0.99D0*DPS(4)) THEN
+ MBST=0
+ MSTU(33)=1
+ CALL LUDBRB(N+1,N+NP,0.D0,0.D0,-DPS(1)/DPS(4),-DPS(2)/DPS(4),
+ & -DPS(3)/DPS(4))
+ ELSE
+ MBST=1
+ HHBZ=SQRT(MAX(1D-6,DPS(4)+DPS(3))/MAX(1D-6,DPS(4)-DPS(3)))
+ DO 130 I=N+1,N+NP
+ HHPMT=P(I,1)**2+P(I,2)**2+P(I,5)**2
+ IF(P(I,3).GT.0.) THEN
+ HHPEZ=(P(I,4)+P(I,3))/HHBZ
+ P(I,3)=0.5*(HHPEZ-HHPMT/HHPEZ)
+ P(I,4)=0.5*(HHPEZ+HHPMT/HHPEZ)
+ ELSE
+ HHPEZ=(P(I,4)-P(I,3))*HHBZ
+ P(I,3)=-0.5*(HHPEZ-HHPMT/HHPEZ)
+ P(I,4)=0.5*(HHPEZ+HHPMT/HHPEZ)
+ ENDIF
+ 130 CONTINUE
+ ENDIF
+
+C...Search for very nearby partons that may be recombined.
+ NTRYR=0
+ PARU12=PARU(12)
+ PARU13=PARU(13)
+ MJU(3)=MJU(1)
+ MJU(4)=MJU(2)
+ NR=NP
+ 140 IF(NR.GE.3) THEN
+ PDRMIN=2.*PARU12
+ DO 150 I=N+1,N+NR
+ IF(I.EQ.N+NR.AND.IABS(K(N+1,2)).NE.21) GOTO 150
+ I1=I+1
+ IF(I.EQ.N+NR) I1=N+1
+ IF(K(I,1).EQ.41.OR.K(I1,1).EQ.41) GOTO 150
+ IF(MJU(1).NE.0.AND.I1.LT.MJU(1).AND.IABS(K(I1,2)).NE.21)
+ & GOTO 150
+ IF(MJU(2).NE.0.AND.I.GT.MJU(2).AND.IABS(K(I,2)).NE.21) GOTO 150
+ PAP=SQRT((P(I,1)**2+P(I,2)**2+P(I,3)**2)*(P(I1,1)**2+
+ & P(I1,2)**2+P(I1,3)**2))
+ PVP=P(I,1)*P(I1,1)+P(I,2)*P(I1,2)+P(I,3)*P(I1,3)
+ PDR=4.*(PAP-PVP)**2/MAX(1D-6,PARU13**2*PAP+2.*(PAP-PVP))
+ IF(PDR.LT.PDRMIN) THEN
+ IR=I
+ PDRMIN=PDR
+ ENDIF
+ 150 CONTINUE
+
+C...Recombine very nearby partons to avoid machine precision problems.
+ IF(PDRMIN.LT.PARU12.AND.IR.EQ.N+NR) THEN
+ DO 160 J=1,4
+ P(N+1,J)=P(N+1,J)+P(N+NR,J)
+ 160 CONTINUE
+ P(N+1,5)=SQRT(MAX(0.D0,P(N+1,4)**2-P(N+1,1)**2-P(N+1,2)**2-
+ & P(N+1,3)**2))
+ NR=NR-1
+ GOTO 140
+ ELSEIF(PDRMIN.LT.PARU12) THEN
+ DO 170 J=1,4
+ P(IR,J)=P(IR,J)+P(IR+1,J)
+ 170 CONTINUE
+ P(IR,5)=SQRT(MAX(0.D0,P(IR,4)**2-P(IR,1)**2-P(IR,2)**2-
+ & P(IR,3)**2))
+ DO 190 I=IR+1,N+NR-1
+ K(I,2)=K(I+1,2)
+ DO 180 J=1,5
+ P(I,J)=P(I+1,J)
+ 180 CONTINUE
+ 190 CONTINUE
+ IF(IR.EQ.N+NR-1) K(IR,2)=K(N+NR,2)
+ NR=NR-1
+ IF(MJU(1).GT.IR) MJU(1)=MJU(1)-1
+ IF(MJU(2).GT.IR) MJU(2)=MJU(2)-1
+ GOTO 140
+ ENDIF
+ ENDIF
+ NTRYR=NTRYR+1
+
+C...Reset particle counter. Skip ahead if no junctions are present;
+C...this is usually the case!
+ NRS=MAX(5*NR+11,NP)
+ NTRY=0
+ 200 NTRY=NTRY+1
+ IF(NTRY.GT.100.AND.NTRYR.LE.4) THEN
+ PARU12=4.*PARU12
+ PARU13=2.*PARU13
+ GOTO 140
+ ELSEIF(NTRY.GT.100) THEN
+ CALL LUERRM(14,'(LUSTRF:) caught in infinite loop')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ I=N+NRS
+ MSTU(90)=MSTU90
+ IF(MJU(1).EQ.0.AND.MJU(2).EQ.0) GOTO 580
+ DO 570 JT=1,2
+ NJS(JT)=0
+ IF(MJU(JT).EQ.0) GOTO 570
+ JS=3-2*JT
+
+C...Find and sum up momentum on three sides of junction. Check flavours.
+ DO 220 IU=1,3
+ IJU(IU)=0
+ DO 210 J=1,5
+ PJU(IU,J)=0.
+ 210 CONTINUE
+ 220 CONTINUE
+ IU=0
+ DO 240 I1=N+1+(JT-1)*(NR-1),N+NR+(JT-1)*(1-NR),JS
+ IF(K(I1,2).NE.21.AND.IU.LE.2) THEN
+ IU=IU+1
+ IJU(IU)=I1
+ ENDIF
+ DO 230 J=1,4
+ PJU(IU,J)=PJU(IU,J)+P(I1,J)
+ 230 CONTINUE
+ 240 CONTINUE
+ DO 250 IU=1,3
+ PJU(IU,5)=SQRT(PJU(IU,1)**2+PJU(IU,2)**2+PJU(IU,3)**2)
+ 250 CONTINUE
+ IF(K(IJU(3),2)/100.NE.10*K(IJU(1),2)+K(IJU(2),2).AND.
+ &K(IJU(3),2)/100.NE.10*K(IJU(2),2)+K(IJU(1),2)) THEN
+ CALL LUERRM(12,'(LUSTRF:) unphysical flavour combination')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+
+C...Calculate (approximate) boost to rest frame of junction.
+ T12=(PJU(1,1)*PJU(2,1)+PJU(1,2)*PJU(2,2)+PJU(1,3)*PJU(2,3))/
+ &(PJU(1,5)*PJU(2,5))
+ T13=(PJU(1,1)*PJU(3,1)+PJU(1,2)*PJU(3,2)+PJU(1,3)*PJU(3,3))/
+ &(PJU(1,5)*PJU(3,5))
+ T23=(PJU(2,1)*PJU(3,1)+PJU(2,2)*PJU(3,2)+PJU(2,3)*PJU(3,3))/
+ &(PJU(2,5)*PJU(3,5))
+ T11=SQRT((2./3.)*(1.-T12)*(1.-T13)/(1.-T23))
+ T22=SQRT((2./3.)*(1.-T12)*(1.-T23)/(1.-T13))
+ TSQ=SQRT((2.*T11*T22+T12-1.)*(1.+T12))
+ T1F=(TSQ-T22*(1.+T12))/(1.-T12**2)
+ T2F=(TSQ-T11*(1.+T12))/(1.-T12**2)
+ DO 260 J=1,3
+ TJU(J)=-(T1F*PJU(1,J)/PJU(1,5)+T2F*PJU(2,J)/PJU(2,5))
+ 260 CONTINUE
+ TJU(4)=SQRT(1.+TJU(1)**2+TJU(2)**2+TJU(3)**2)
+ DO 270 IU=1,3
+ PJU(IU,5)=TJU(4)*PJU(IU,4)-TJU(1)*PJU(IU,1)-TJU(2)*PJU(IU,2)-
+ &TJU(3)*PJU(IU,3)
+ 270 CONTINUE
+
+C...Put junction at rest if motion could give inconsistencies.
+ IF(PJU(1,5)+PJU(2,5).GT.PJU(1,4)+PJU(2,4)) THEN
+ DO 280 J=1,3
+ TJU(J)=0.
+ 280 CONTINUE
+ TJU(4)=1.
+ PJU(1,5)=PJU(1,4)
+ PJU(2,5)=PJU(2,4)
+ PJU(3,5)=PJU(3,4)
+ ENDIF
+
+C...Start preparing for fragmentation of two strings from junction.
+ ISTA=I
+ DO 550 IU=1,2
+ NS=IJU(IU+1)-IJU(IU)
+
+C...Junction strings: find longitudinal string directions.
+ DO 310 IS=1,NS
+ IS1=IJU(IU)+IS-1
+ IS2=IJU(IU)+IS
+ DO 290 J=1,5
+ DP(1,J)=0.5*P(IS1,J)
+ IF(IS.EQ.1) DP(1,J)=P(IS1,J)
+ DP(2,J)=0.5*P(IS2,J)
+ IF(IS.EQ.NS) DP(2,J)=-PJU(IU,J)
+ 290 CONTINUE
+ IF(IS.EQ.NS) DP(2,4)=SQRT(PJU(IU,1)**2+PJU(IU,2)**2+PJU(IU,3)**2)
+ IF(IS.EQ.NS) DP(2,5)=0.
+ DP(3,5)=DFOUR(1,1)
+ DP(4,5)=DFOUR(2,2)
+ DHKC=DFOUR(1,2)
+ IF(DP(3,5)+2.*DHKC+DP(4,5).LE.0.) THEN
+ DP(1,4)=SQRT(DP(1,1)**2+DP(1,2)**2+DP(1,3)**2)
+ DP(2,4)=SQRT(DP(2,1)**2+DP(2,2)**2+DP(2,3)**2)
+ DP(3,5)=0D0
+ DP(4,5)=0D0
+ DHKC=DFOUR(1,2)
+ ENDIF
+ DHKS=SQRT(DHKC**2-DP(3,5)*DP(4,5))
+ DHK1=0.5*((DP(4,5)+DHKC)/DHKS-1.)
+ DHK2=0.5*((DP(3,5)+DHKC)/DHKS-1.)
+ IN1=N+NR+4*IS-3
+ P(IN1,5)=SQRT(DP(3,5)+2.*DHKC+DP(4,5))
+ DO 300 J=1,4
+ P(IN1,J)=(1.+DHK1)*DP(1,J)-DHK2*DP(2,J)
+ P(IN1+1,J)=(1.+DHK2)*DP(2,J)-DHK1*DP(1,J)
+ 300 CONTINUE
+ 310 CONTINUE
+
+C...Junction strings: initialize flavour, momentum and starting pos.
+ ISAV=I
+ MSTU91=MSTU(90)
+ 320 NTRY=NTRY+1
+ IF(NTRY.GT.100.AND.NTRYR.LE.4) THEN
+ PARU12=4.*PARU12
+ PARU13=2.*PARU13
+ GOTO 140
+ ELSEIF(NTRY.GT.100) THEN
+ CALL LUERRM(14,'(LUSTRF:) caught in infinite loop')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ I=ISAV
+ MSTU(90)=MSTU91
+ IRANKJ=0
+ IE(1)=K(N+1+(JT/2)*(NP-1),3)
+ IN(4)=N+NR+1
+ IN(5)=IN(4)+1
+ IN(6)=N+NR+4*NS+1
+ DO 340 JQ=1,2
+ DO 330 IN1=N+NR+2+JQ,N+NR+4*NS-2+JQ,4
+ P(IN1,1)=2-JQ
+ P(IN1,2)=JQ-1
+ P(IN1,3)=1.
+ 330 CONTINUE
+ 340 CONTINUE
+ KFL(1)=K(IJU(IU),2)
+ PX(1)=0.
+ PY(1)=0.
+ GAM(1)=0.
+ DO 350 J=1,5
+ PJU(IU+3,J)=0.
+ 350 CONTINUE
+
+C...Junction strings: find initial transverse directions.
+ DO 360 J=1,4
+ DP(1,J)=P(IN(4),J)
+ DP(2,J)=P(IN(4)+1,J)
+ DP(3,J)=0.
+ DP(4,J)=0.
+ 360 CONTINUE
+ DP(1,4)=SQRT(DP(1,1)**2+DP(1,2)**2+DP(1,3)**2)
+ DP(2,4)=SQRT(DP(2,1)**2+DP(2,2)**2+DP(2,3)**2)
+ DP(5,1)=DP(1,1)/DP(1,4)-DP(2,1)/DP(2,4)
+ DP(5,2)=DP(1,2)/DP(1,4)-DP(2,2)/DP(2,4)
+ DP(5,3)=DP(1,3)/DP(1,4)-DP(2,3)/DP(2,4)
+ IF(DP(5,1)**2.LE.DP(5,2)**2+DP(5,3)**2) DP(3,1)=1.
+ IF(DP(5,1)**2.GT.DP(5,2)**2+DP(5,3)**2) DP(3,3)=1.
+ IF(DP(5,2)**2.LE.DP(5,1)**2+DP(5,3)**2) DP(4,2)=1.
+ IF(DP(5,2)**2.GT.DP(5,1)**2+DP(5,3)**2) DP(4,3)=1.
+ DHC12=DFOUR(1,2)
+ DHCX1=DFOUR(3,1)/DHC12
+ DHCX2=DFOUR(3,2)/DHC12
+ DHCXX=1D0/SQRT(1D0+2D0*DHCX1*DHCX2*DHC12)
+ DHCY1=DFOUR(4,1)/DHC12
+ DHCY2=DFOUR(4,2)/DHC12
+ DHCYX=DHCXX*(DHCX1*DHCY2+DHCX2*DHCY1)*DHC12
+ DHCYY=1D0/SQRT(1D0+2D0*DHCY1*DHCY2*DHC12-DHCYX**2)
+ DO 370 J=1,4
+ DP(3,J)=DHCXX*(DP(3,J)-DHCX2*DP(1,J)-DHCX1*DP(2,J))
+ P(IN(6),J)=DP(3,J)
+ P(IN(6)+1,J)=DHCYY*(DP(4,J)-DHCY2*DP(1,J)-DHCY1*DP(2,J)-
+ &DHCYX*DP(3,J))
+ 370 CONTINUE
+
+C...Junction strings: produce new particle, origin.
+ 380 I=I+1
+ IF(2*I-NSAV.GE.MSTU(4)-MSTU(32)-5) THEN
+ CALL LUERRM(11,'(LUSTRF:) no more memory left in LUJETS')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ IRANKJ=IRANKJ+1
+ K(I,1)=1
+ K(I,3)=IE(1)
+ K(I,4)=0
+ K(I,5)=0
+
+C...Junction strings: generate flavour, hadron, pT, z and Gamma.
+ 390 CALL LUKFDI(KFL(1),0,KFL(3),K(I,2))
+ IF(K(I,2).EQ.0) GOTO 320
+ IF(MSTJ(12).GE.3.AND.IRANKJ.EQ.1.AND.IABS(KFL(1)).LE.10.AND.
+ &IABS(KFL(3)).GT.10) THEN
+ IF(RLU(0).GT.PARJ(19)) GOTO 390
+ ENDIF
+ P(I,5)=ULMASS(K(I,2))
+ CALL LUPTDI(KFL(1),PX(3),PY(3))
+ PR(1)=P(I,5)**2+(PX(1)+PX(3))**2+(PY(1)+PY(3))**2
+ CALL LUZDIS(KFL(1),KFL(3),PR(1),Z)
+ IF(IABS(KFL(1)).GE.4.AND.IABS(KFL(1)).LE.8.AND.
+ &MSTU(90).LT.8) THEN
+ MSTU(90)=MSTU(90)+1
+ MSTU(90+MSTU(90))=I
+ PARU(90+MSTU(90))=Z
+ ENDIF
+ GAM(3)=(1.-Z)*(GAM(1)+PR(1)/Z)
+ DO 400 J=1,3
+ IN(J)=IN(3+J)
+ 400 CONTINUE
+
+C...Junction strings: stepping within or from 'low' string region easy.
+ IF(IN(1)+1.EQ.IN(2).AND.Z*P(IN(1)+2,3)*P(IN(2)+2,3)*
+ &P(IN(1),5)**2.GE.PR(1)) THEN
+ P(IN(1)+2,4)=Z*P(IN(1)+2,3)
+ P(IN(2)+2,4)=PR(1)/(P(IN(1)+2,4)*P(IN(1),5)**2)
+ DO 410 J=1,4
+ P(I,J)=(PX(1)+PX(3))*P(IN(3),J)+(PY(1)+PY(3))*P(IN(3)+1,J)
+ 410 CONTINUE
+ GOTO 500
+ ELSEIF(IN(1)+1.EQ.IN(2)) THEN
+ P(IN(2)+2,4)=P(IN(2)+2,3)
+ P(IN(2)+2,1)=1.
+ IN(2)=IN(2)+4
+ IF(IN(2).GT.N+NR+4*NS) GOTO 320
+ IF(FOUR(IN(1),IN(2)).LE.1D-2) THEN
+ P(IN(1)+2,4)=P(IN(1)+2,3)
+ P(IN(1)+2,1)=0.
+ IN(1)=IN(1)+4
+ ENDIF
+ ENDIF
+
+C...Junction strings: find new transverse directions.
+ 420 IF(IN(1).GT.N+NR+4*NS.OR.IN(2).GT.N+NR+4*NS.OR.
+ &IN(1).GT.IN(2)) GOTO 320
+ IF(IN(1).NE.IN(4).OR.IN(2).NE.IN(5)) THEN
+ DO 430 J=1,4
+ DP(1,J)=P(IN(1),J)
+ DP(2,J)=P(IN(2),J)
+ DP(3,J)=0.
+ DP(4,J)=0.
+ 430 CONTINUE
+ DP(1,4)=SQRT(DP(1,1)**2+DP(1,2)**2+DP(1,3)**2)
+ DP(2,4)=SQRT(DP(2,1)**2+DP(2,2)**2+DP(2,3)**2)
+ DHC12=DFOUR(1,2)
+ IF(DHC12.LE.1D-2) THEN
+ P(IN(1)+2,4)=P(IN(1)+2,3)
+ P(IN(1)+2,1)=0.
+ IN(1)=IN(1)+4
+ GOTO 420
+ ENDIF
+ IN(3)=N+NR+4*NS+5
+ DP(5,1)=DP(1,1)/DP(1,4)-DP(2,1)/DP(2,4)
+ DP(5,2)=DP(1,2)/DP(1,4)-DP(2,2)/DP(2,4)
+ DP(5,3)=DP(1,3)/DP(1,4)-DP(2,3)/DP(2,4)
+ IF(DP(5,1)**2.LE.DP(5,2)**2+DP(5,3)**2) DP(3,1)=1.
+ IF(DP(5,1)**2.GT.DP(5,2)**2+DP(5,3)**2) DP(3,3)=1.
+ IF(DP(5,2)**2.LE.DP(5,1)**2+DP(5,3)**2) DP(4,2)=1.
+ IF(DP(5,2)**2.GT.DP(5,1)**2+DP(5,3)**2) DP(4,3)=1.
+ DHCX1=DFOUR(3,1)/DHC12
+ DHCX2=DFOUR(3,2)/DHC12
+ DHCXX=1D0/SQRT(1D0+2D0*DHCX1*DHCX2*DHC12)
+ DHCY1=DFOUR(4,1)/DHC12
+ DHCY2=DFOUR(4,2)/DHC12
+ DHCYX=DHCXX*(DHCX1*DHCY2+DHCX2*DHCY1)*DHC12
+ DHCYY=1D0/SQRT(1D0+2D0*DHCY1*DHCY2*DHC12-DHCYX**2)
+ DO 440 J=1,4
+ DP(3,J)=DHCXX*(DP(3,J)-DHCX2*DP(1,J)-DHCX1*DP(2,J))
+ P(IN(3),J)=DP(3,J)
+ P(IN(3)+1,J)=DHCYY*(DP(4,J)-DHCY2*DP(1,J)-DHCY1*DP(2,J)-
+ & DHCYX*DP(3,J))
+ 440 CONTINUE
+C...Express pT with respect to new axes, if sensible.
+ PXP=-(PX(3)*FOUR(IN(6),IN(3))+PY(3)*FOUR(IN(6)+1,IN(3)))
+ PYP=-(PX(3)*FOUR(IN(6),IN(3)+1)+PY(3)*FOUR(IN(6)+1,IN(3)+1))
+ IF(ABS(PXP**2+PYP**2-PX(3)**2-PY(3)**2).LT.0.01) THEN
+ PX(3)=PXP
+ PY(3)=PYP
+ ENDIF
+ ENDIF
+
+C...Junction strings: sum up known four-momentum, coefficients for m2.
+ DO 470 J=1,4
+ DHG(J)=0.
+ P(I,J)=PX(1)*P(IN(6),J)+PY(1)*P(IN(6)+1,J)+PX(3)*P(IN(3),J)+
+ &PY(3)*P(IN(3)+1,J)
+ DO 450 IN1=IN(4),IN(1)-4,4
+ P(I,J)=P(I,J)+P(IN1+2,3)*P(IN1,J)
+ 450 CONTINUE
+ DO 460 IN2=IN(5),IN(2)-4,4
+ P(I,J)=P(I,J)+P(IN2+2,3)*P(IN2,J)
+ 460 CONTINUE
+ 470 CONTINUE
+ DHM(1)=FOUR(I,I)
+ DHM(2)=2.*FOUR(I,IN(1))
+ DHM(3)=2.*FOUR(I,IN(2))
+ DHM(4)=2.*FOUR(IN(1),IN(2))
+
+C...Junction strings: find coefficients for Gamma expression.
+ DO 490 IN2=IN(1)+1,IN(2),4
+ DO 480 IN1=IN(1),IN2-1,4
+ DHC=2.*FOUR(IN1,IN2)
+ DHG(1)=DHG(1)+P(IN1+2,1)*P(IN2+2,1)*DHC
+ IF(IN1.EQ.IN(1)) DHG(2)=DHG(2)-P(IN2+2,1)*DHC
+ IF(IN2.EQ.IN(2)) DHG(3)=DHG(3)+P(IN1+2,1)*DHC
+ IF(IN1.EQ.IN(1).AND.IN2.EQ.IN(2)) DHG(4)=DHG(4)-DHC
+ 480 CONTINUE
+ 490 CONTINUE
+
+C...Junction strings: solve (m2, Gamma) equation system for energies.
+ DHS1=DHM(3)*DHG(4)-DHM(4)*DHG(3)
+ IF(ABS(DHS1).LT.1D-4) GOTO 320
+ DHS2=DHM(4)*(GAM(3)-DHG(1))-DHM(2)*DHG(3)-DHG(4)*
+ &(P(I,5)**2-DHM(1))+DHG(2)*DHM(3)
+ DHS3=DHM(2)*(GAM(3)-DHG(1))-DHG(2)*(P(I,5)**2-DHM(1))
+ P(IN(2)+2,4)=0.5*(SQRT(MAX(0D0,DHS2**2-4.*DHS1*DHS3))/ABS(DHS1)-
+ &DHS2/DHS1)
+ IF(DHM(2)+DHM(4)*P(IN(2)+2,4).LE.0.) GOTO 320
+ P(IN(1)+2,4)=(P(I,5)**2-DHM(1)-DHM(3)*P(IN(2)+2,4))/
+ &(DHM(2)+DHM(4)*P(IN(2)+2,4))
+
+C...Junction strings: step to new region if necessary.
+ IF(P(IN(2)+2,4).GT.P(IN(2)+2,3)) THEN
+ P(IN(2)+2,4)=P(IN(2)+2,3)
+ P(IN(2)+2,1)=1.
+ IN(2)=IN(2)+4
+ IF(IN(2).GT.N+NR+4*NS) GOTO 320
+ IF(FOUR(IN(1),IN(2)).LE.1D-2) THEN
+ P(IN(1)+2,4)=P(IN(1)+2,3)
+ P(IN(1)+2,1)=0.
+ IN(1)=IN(1)+4
+ ENDIF
+ GOTO 420
+ ELSEIF(P(IN(1)+2,4).GT.P(IN(1)+2,3)) THEN
+ P(IN(1)+2,4)=P(IN(1)+2,3)
+ P(IN(1)+2,1)=0.
+ IN(1)=IN(1)+JS
+ GOTO 820
+ ENDIF
+
+C...Junction strings: particle four-momentum, remainder, loop back.
+ 500 DO 510 J=1,4
+ P(I,J)=P(I,J)+P(IN(1)+2,4)*P(IN(1),J)+P(IN(2)+2,4)*P(IN(2),J)
+ PJU(IU+3,J)=PJU(IU+3,J)+P(I,J)
+ 510 CONTINUE
+ IF(P(I,4).LT.P(I,5)) GOTO 320
+ PJU(IU+3,5)=TJU(4)*PJU(IU+3,4)-TJU(1)*PJU(IU+3,1)-
+ &TJU(2)*PJU(IU+3,2)-TJU(3)*PJU(IU+3,3)
+ IF(PJU(IU+3,5).LT.PJU(IU,5)) THEN
+ KFL(1)=-KFL(3)
+ PX(1)=-PX(3)
+ PY(1)=-PY(3)
+ GAM(1)=GAM(3)
+ IF(IN(3).NE.IN(6)) THEN
+ DO 520 J=1,4
+ P(IN(6),J)=P(IN(3),J)
+ P(IN(6)+1,J)=P(IN(3)+1,J)
+ 520 CONTINUE
+ ENDIF
+ DO 530 JQ=1,2
+ IN(3+JQ)=IN(JQ)
+ P(IN(JQ)+2,3)=P(IN(JQ)+2,3)-P(IN(JQ)+2,4)
+ P(IN(JQ)+2,1)=P(IN(JQ)+2,1)-(3-2*JQ)*P(IN(JQ)+2,4)
+ 530 CONTINUE
+ GOTO 380
+ ENDIF
+
+C...Junction strings: save quantities left after each string.
+ IF(IABS(KFL(1)).GT.10) GOTO 320
+ I=I-1
+ KFJH(IU)=KFL(1)
+ DO 540 J=1,4
+ PJU(IU+3,J)=PJU(IU+3,J)-P(I+1,J)
+ 540 CONTINUE
+ 550 CONTINUE
+
+C...Junction strings: put together to new effective string endpoint.
+ NJS(JT)=I-ISTA
+ KFJS(JT)=K(K(MJU(JT+2),3),2)
+ KFLS=2*INT(RLU(0)+3.*PARJ(4)/(1.+3.*PARJ(4)))+1
+ IF(KFJH(1).EQ.KFJH(2)) KFLS=3
+ IF(ISTA.NE.I) KFJS(JT)=ISIGN(1000*MAX(IABS(KFJH(1)),
+ &IABS(KFJH(2)))+100*MIN(IABS(KFJH(1)),IABS(KFJH(2)))+
+ &KFLS,KFJH(1))
+ DO 560 J=1,4
+ PJS(JT,J)=PJU(1,J)+PJU(2,J)+P(MJU(JT),J)
+ PJS(JT+2,J)=PJU(4,J)+PJU(5,J)
+ 560 CONTINUE
+ PJS(JT,5)=SQRT(MAX(0.D0,PJS(JT,4)**2-PJS(JT,1)**2-PJS(JT,2)**2-
+ &PJS(JT,3)**2))
+ 570 CONTINUE
+
+C...Open versus closed strings. Choose breakup region for latter.
+ 580 IF(MJU(1).NE.0.AND.MJU(2).NE.0) THEN
+ NS=MJU(2)-MJU(1)
+ NB=MJU(1)-N
+ ELSEIF(MJU(1).NE.0) THEN
+ NS=N+NR-MJU(1)
+ NB=MJU(1)-N
+ ELSEIF(MJU(2).NE.0) THEN
+ NS=MJU(2)-N
+ NB=1
+ ELSEIF(IABS(K(N+1,2)).NE.21) THEN
+ NS=NR-1
+ NB=1
+ ELSE
+ NS=NR+1
+ W2SUM=0.
+ DO 590 IS=1,NR
+ P(N+NR+IS,1)=0.5*FOUR(N+IS,N+IS+1-NR*(IS/NR))
+ W2SUM=W2SUM+P(N+NR+IS,1)
+ 590 CONTINUE
+ W2RAN=RLU(0)*W2SUM
+ NB=0
+ 600 NB=NB+1
+ W2SUM=W2SUM-P(N+NR+NB,1)
+ IF(W2SUM.GT.W2RAN.AND.NB.LT.NR) GOTO 600
+ ENDIF
+
+C...Find longitudinal string directions (i.e. lightlike four-vectors).
+ DO 630 IS=1,NS
+ IS1=N+IS+NB-1-NR*((IS+NB-2)/NR)
+ IS2=N+IS+NB-NR*((IS+NB-1)/NR)
+ DO 610 J=1,5
+ DP(1,J)=P(IS1,J)
+ IF(IABS(K(IS1,2)).EQ.21) DP(1,J)=0.5*DP(1,J)
+ IF(IS1.EQ.MJU(1)) DP(1,J)=PJS(1,J)-PJS(3,J)
+ DP(2,J)=P(IS2,J)
+ IF(IABS(K(IS2,2)).EQ.21) DP(2,J)=0.5*DP(2,J)
+ IF(IS2.EQ.MJU(2)) DP(2,J)=PJS(2,J)-PJS(4,J)
+ 610 CONTINUE
+ DP(3,5)=DFOUR(1,1)
+ DP(4,5)=DFOUR(2,2)
+ DHKC=DFOUR(1,2)
+ IF(DP(3,5)+2.*DHKC+DP(4,5).LE.0.) THEN
+ DP(3,5)=DP(1,5)**2
+ DP(4,5)=DP(2,5)**2
+ DP(1,4)=SQRT(DP(1,1)**2+DP(1,2)**2+DP(1,3)**2+DP(1,5)**2)
+ DP(2,4)=SQRT(DP(2,1)**2+DP(2,2)**2+DP(2,3)**2+DP(2,5)**2)
+ DHKC=DFOUR(1,2)
+ ENDIF
+ DHKS=SQRT(DHKC**2-DP(3,5)*DP(4,5))
+ DHK1=0.5*((DP(4,5)+DHKC)/DHKS-1.)
+ DHK2=0.5*((DP(3,5)+DHKC)/DHKS-1.)
+ IN1=N+NR+4*IS-3
+ P(IN1,5)=SQRT(DP(3,5)+2.*DHKC+DP(4,5))
+ DO 620 J=1,4
+ P(IN1,J)=(1.+DHK1)*DP(1,J)-DHK2*DP(2,J)
+ P(IN1+1,J)=(1.+DHK2)*DP(2,J)-DHK1*DP(1,J)
+ 620 CONTINUE
+ 630 CONTINUE
+
+C...Begin initialization: sum up energy, set starting position.
+ ISAV=I
+ MSTU91=MSTU(90)
+ 640 NTRY=NTRY+1
+ IF(NTRY.GT.100.AND.NTRYR.LE.4) THEN
+ PARU12=4.*PARU12
+ PARU13=2.*PARU13
+ GOTO 140
+ ELSEIF(NTRY.GT.100) THEN
+ CALL LUERRM(14,'(LUSTRF:) caught in infinite loop')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ I=ISAV
+ MSTU(90)=MSTU91
+ DO 660 J=1,4
+ P(N+NRS,J)=0.
+ DO 650 IS=1,NR
+ P(N+NRS,J)=P(N+NRS,J)+P(N+IS,J)
+ 650 CONTINUE
+ 660 CONTINUE
+ DO 680 JT=1,2
+ IRANK(JT)=0
+ IF(MJU(JT).NE.0) IRANK(JT)=NJS(JT)
+ IF(NS.GT.NR) IRANK(JT)=1
+ IE(JT)=K(N+1+(JT/2)*(NP-1),3)
+ IN(3*JT+1)=N+NR+1+4*(JT/2)*(NS-1)
+ IN(3*JT+2)=IN(3*JT+1)+1
+ IN(3*JT+3)=N+NR+4*NS+2*JT-1
+ DO 670 IN1=N+NR+2+JT,N+NR+4*NS-2+JT,4
+ P(IN1,1)=2-JT
+ P(IN1,2)=JT-1
+ P(IN1,3)=1.
+ 670 CONTINUE
+ 680 CONTINUE
+
+C...Initialize flavour and pT variables for open string.
+ IF(NS.LT.NR) THEN
+ PX(1)=0.
+ PY(1)=0.
+ IF(NS.EQ.1.AND.MJU(1)+MJU(2).EQ.0) CALL LUPTDI(0,PX(1),PY(1))
+ PX(2)=-PX(1)
+ PY(2)=-PY(1)
+ DO 690 JT=1,2
+ KFL(JT)=K(IE(JT),2)
+ IF(MJU(JT).NE.0) KFL(JT)=KFJS(JT)
+ MSTJ(93)=1
+ PMQ(JT)=ULMASS(KFL(JT))
+ GAM(JT)=0.
+ 690 CONTINUE
+
+C...Closed string: random initial breakup flavour, pT and vertex.
+ ELSE
+ KFL(3)=INT(1.+(2.+PARJ(2))*RLU(0))*(-1)**INT(RLU(0)+0.5)
+ CALL LUKFDI(KFL(3),0,KFL(1),KDUMP)
+ KFL(2)=-KFL(1)
+ IF(IABS(KFL(1)).GT.10.AND.RLU(0).GT.0.5) THEN
+ KFL(2)=-(KFL(1)+ISIGN(10000,KFL(1)))
+ ELSEIF(IABS(KFL(1)).GT.10) THEN
+ KFL(1)=-(KFL(2)+ISIGN(10000,KFL(2)))
+ ENDIF
+ CALL LUPTDI(KFL(1),PX(1),PY(1))
+ PX(2)=-PX(1)
+ PY(2)=-PY(1)
+ PR3=MIN(25.D0,0.1*P(N+NR+1,5)**2)
+ 700 CALL LUZDIS(KFL(1),KFL(2),PR3,Z)
+ ZR=PR3/(Z*P(N+NR+1,5)**2)
+ IF(ZR.GE.1.) GOTO 700
+ DO 710 JT=1,2
+ MSTJ(93)=1
+ PMQ(JT)=ULMASS(KFL(JT))
+ GAM(JT)=PR3*(1.-Z)/Z
+ IN1=N+NR+3+4*(JT/2)*(NS-1)
+ P(IN1,JT)=1.-Z
+ P(IN1,3-JT)=JT-1
+ P(IN1,3)=(2-JT)*(1.-Z)+(JT-1)*Z
+ P(IN1+1,JT)=ZR
+ P(IN1+1,3-JT)=2-JT
+ P(IN1+1,3)=(2-JT)*(1.-ZR)+(JT-1)*ZR
+ 710 CONTINUE
+ ENDIF
+
+C...Find initial transverse directions (i.e. spacelike four-vectors).
+ DO 750 JT=1,2
+ IF(JT.EQ.1.OR.NS.EQ.NR-1) THEN
+ IN1=IN(3*JT+1)
+ IN3=IN(3*JT+3)
+ DO 720 J=1,4
+ DP(1,J)=P(IN1,J)
+ DP(2,J)=P(IN1+1,J)
+ DP(3,J)=0.
+ DP(4,J)=0.
+ 720 CONTINUE
+ DP(1,4)=SQRT(DP(1,1)**2+DP(1,2)**2+DP(1,3)**2)
+ DP(2,4)=SQRT(DP(2,1)**2+DP(2,2)**2+DP(2,3)**2)
+ DP(5,1)=DP(1,1)/DP(1,4)-DP(2,1)/DP(2,4)
+ DP(5,2)=DP(1,2)/DP(1,4)-DP(2,2)/DP(2,4)
+ DP(5,3)=DP(1,3)/DP(1,4)-DP(2,3)/DP(2,4)
+ IF(DP(5,1)**2.LE.DP(5,2)**2+DP(5,3)**2) DP(3,1)=1.
+ IF(DP(5,1)**2.GT.DP(5,2)**2+DP(5,3)**2) DP(3,3)=1.
+ IF(DP(5,2)**2.LE.DP(5,1)**2+DP(5,3)**2) DP(4,2)=1.
+ IF(DP(5,2)**2.GT.DP(5,1)**2+DP(5,3)**2) DP(4,3)=1.
+ DHC12=DFOUR(1,2)
+ DHCX1=DFOUR(3,1)/DHC12
+ DHCX2=DFOUR(3,2)/DHC12
+ DHCXX=1D0/SQRT(1D0+2D0*DHCX1*DHCX2*DHC12)
+ DHCY1=DFOUR(4,1)/DHC12
+ DHCY2=DFOUR(4,2)/DHC12
+ DHCYX=DHCXX*(DHCX1*DHCY2+DHCX2*DHCY1)*DHC12
+ DHCYY=1D0/SQRT(1D0+2D0*DHCY1*DHCY2*DHC12-DHCYX**2)
+ DO 730 J=1,4
+ DP(3,J)=DHCXX*(DP(3,J)-DHCX2*DP(1,J)-DHCX1*DP(2,J))
+ P(IN3,J)=DP(3,J)
+ P(IN3+1,J)=DHCYY*(DP(4,J)-DHCY2*DP(1,J)-DHCY1*DP(2,J)-
+ & DHCYX*DP(3,J))
+ 730 CONTINUE
+ ELSE
+ DO 740 J=1,4
+ P(IN3+2,J)=P(IN3,J)
+ P(IN3+3,J)=P(IN3+1,J)
+ 740 CONTINUE
+ ENDIF
+ 750 CONTINUE
+
+C...Remove energy used up in junction string fragmentation.
+ IF(MJU(1)+MJU(2).GT.0) THEN
+ DO 770 JT=1,2
+ IF(NJS(JT).EQ.0) GOTO 770
+ DO 760 J=1,4
+ P(N+NRS,J)=P(N+NRS,J)-PJS(JT+2,J)
+ 760 CONTINUE
+ 770 CONTINUE
+ ENDIF
+
+C...Produce new particle: side, origin.
+ 780 I=I+1
+ IF(2*I-NSAV.GE.MSTU(4)-MSTU(32)-5) THEN
+ CALL LUERRM(11,'(LUSTRF:) no more memory left in LUJETS')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ JT=1.5+RLU(0)
+ IF(IABS(KFL(3-JT)).GT.10) JT=3-JT
+ IF(IABS(KFL(3-JT)).GE.4.AND.IABS(KFL(3-JT)).LE.8) JT=3-JT
+ JR=3-JT
+ JS=3-2*JT
+ IRANK(JT)=IRANK(JT)+1
+ K(I,1)=1
+ K(I,3)=IE(JT)
+ K(I,4)=0
+ K(I,5)=0
+
+C...Generate flavour, hadron and pT.
+ 790 CALL LUKFDI(KFL(JT),0,KFL(3),K(I,2))
+ IF(K(I,2).EQ.0) GOTO 640
+ IF(MSTJ(12).GE.3.AND.IRANK(JT).EQ.1.AND.IABS(KFL(JT)).LE.10.AND.
+ &IABS(KFL(3)).GT.10) THEN
+ IF(RLU(0).GT.PARJ(19)) GOTO 790
+ ENDIF
+ P(I,5)=ULMASS(K(I,2))
+ CALL LUPTDI(KFL(JT),PX(3),PY(3))
+ PR(JT)=P(I,5)**2+(PX(JT)+PX(3))**2+(PY(JT)+PY(3))**2
+
+C...Final hadrons for small invariant mass.
+ MSTJ(93)=1
+ PMQ(3)=ULMASS(KFL(3))
+ PARJST=PARJ(33)
+ IF(MSTJ(11).EQ.2) PARJST=PARJ(34)
+ WMIN=PARJST+PMQ(1)+PMQ(2)+PARJ(36)*PMQ(3)
+ IF(IABS(KFL(JT)).GT.10.AND.IABS(KFL(3)).GT.10) WMIN=
+ &WMIN-0.5*PARJ(36)*PMQ(3)
+ WREM2=FOUR(N+NRS,N+NRS)
+ IF(WREM2.LT.0.10) GOTO 640
+ IF(WREM2.LT.MAX(WMIN*(1.+(2.*RLU(0)-1.)*PARJ(37)),
+ &PARJ(32)+PMQ(1)+PMQ(2))**2) GOTO 940
+
+C...Choose z, which gives Gamma. Shift z for heavy flavours.
+ CALL LUZDIS(KFL(JT),KFL(3),PR(JT),Z)
+ IF(IABS(KFL(JT)).GE.4.AND.IABS(KFL(JT)).LE.8.AND.
+ &MSTU(90).LT.8) THEN
+ MSTU(90)=MSTU(90)+1
+ MSTU(90+MSTU(90))=I
+ PARU(90+MSTU(90))=Z
+ ENDIF
+ KFL1A=IABS(KFL(1))
+ KFL2A=IABS(KFL(2))
+ IF(MAX(MOD(KFL1A,10),MOD(KFL1A/1000,10),MOD(KFL2A,10),
+ &MOD(KFL2A/1000,10)).GE.4) THEN
+ PR(JR)=(PMQ(JR)+PMQ(3))**2+(PX(JR)-PX(3))**2+(PY(JR)-PY(3))**2
+ PW12=SQRT(MAX(0.D0,(WREM2-PR(1)-PR(2))**2-4.*PR(1)*PR(2)))
+ Z=(WREM2+PR(JT)-PR(JR)+PW12*(2.*Z-1.))/(2.*WREM2)
+ PR(JR)=(PMQ(JR)+PARJST)**2+(PX(JR)-PX(3))**2+(PY(JR)-PY(3))**2
+ IF((1.-Z)*(WREM2-PR(JT)/Z).LT.PR(JR)) GOTO 940
+ ENDIF
+ GAM(3)=(1.-Z)*(GAM(JT)+PR(JT)/Z)
+ DO 800 J=1,3
+ IN(J)=IN(3*JT+J)
+ 800 CONTINUE
+
+C...Stepping within or from 'low' string region easy.
+ IF(IN(1)+1.EQ.IN(2).AND.Z*P(IN(1)+2,3)*P(IN(2)+2,3)*
+ &P(IN(1),5)**2.GE.PR(JT)) THEN
+ P(IN(JT)+2,4)=Z*P(IN(JT)+2,3)
+ P(IN(JR)+2,4)=PR(JT)/(P(IN(JT)+2,4)*P(IN(1),5)**2)
+ DO 810 J=1,4
+ P(I,J)=(PX(JT)+PX(3))*P(IN(3),J)+(PY(JT)+PY(3))*P(IN(3)+1,J)
+ 810 CONTINUE
+ GOTO 900
+ ELSEIF(IN(1)+1.EQ.IN(2)) THEN
+ P(IN(JR)+2,4)=P(IN(JR)+2,3)
+ P(IN(JR)+2,JT)=1.
+ IN(JR)=IN(JR)+4*JS
+ IF(JS*IN(JR).GT.JS*IN(4*JR)) GOTO 640
+ IF(FOUR(IN(1),IN(2)).LE.1D-2) THEN
+ P(IN(JT)+2,4)=P(IN(JT)+2,3)
+ P(IN(JT)+2,JT)=0.
+ IN(JT)=IN(JT)+4*JS
+ ENDIF
+ ENDIF
+
+C...Find new transverse directions (i.e. spacelike string vectors).
+ 820 IF(JS*IN(1).GT.JS*IN(3*JR+1).OR.JS*IN(2).GT.JS*IN(3*JR+2).OR.
+ &IN(1).GT.IN(2)) GOTO 640
+ IF(IN(1).NE.IN(3*JT+1).OR.IN(2).NE.IN(3*JT+2)) THEN
+ DO 830 J=1,4
+ DP(1,J)=P(IN(1),J)
+ DP(2,J)=P(IN(2),J)
+ DP(3,J)=0.
+ DP(4,J)=0.
+ 830 CONTINUE
+ DP(1,4)=SQRT(DP(1,1)**2+DP(1,2)**2+DP(1,3)**2)
+ DP(2,4)=SQRT(DP(2,1)**2+DP(2,2)**2+DP(2,3)**2)
+ DHC12=DFOUR(1,2)
+ IF(DHC12.LE.1D-2) THEN
+ P(IN(JT)+2,4)=P(IN(JT)+2,3)
+ P(IN(JT)+2,JT)=0.
+ IN(JT)=IN(JT)+4*JS
+ GOTO 820
+ ENDIF
+ IN(3)=N+NR+4*NS+5
+ DP(5,1)=DP(1,1)/DP(1,4)-DP(2,1)/DP(2,4)
+ DP(5,2)=DP(1,2)/DP(1,4)-DP(2,2)/DP(2,4)
+ DP(5,3)=DP(1,3)/DP(1,4)-DP(2,3)/DP(2,4)
+ IF(DP(5,1)**2.LE.DP(5,2)**2+DP(5,3)**2) DP(3,1)=1.
+ IF(DP(5,1)**2.GT.DP(5,2)**2+DP(5,3)**2) DP(3,3)=1.
+ IF(DP(5,2)**2.LE.DP(5,1)**2+DP(5,3)**2) DP(4,2)=1.
+ IF(DP(5,2)**2.GT.DP(5,1)**2+DP(5,3)**2) DP(4,3)=1.
+ DHCX1=DFOUR(3,1)/DHC12
+ DHCX2=DFOUR(3,2)/DHC12
+ DHCXX=1D0/SQRT(1D0+2D0*DHCX1*DHCX2*DHC12)
+ DHCY1=DFOUR(4,1)/DHC12
+ DHCY2=DFOUR(4,2)/DHC12
+ DHCYX=DHCXX*(DHCX1*DHCY2+DHCX2*DHCY1)*DHC12
+ DHCYY=1D0/SQRT(1D0+2D0*DHCY1*DHCY2*DHC12-DHCYX**2)
+ DO 840 J=1,4
+ DP(3,J)=DHCXX*(DP(3,J)-DHCX2*DP(1,J)-DHCX1*DP(2,J))
+ P(IN(3),J)=DP(3,J)
+ P(IN(3)+1,J)=DHCYY*(DP(4,J)-DHCY2*DP(1,J)-DHCY1*DP(2,J)-
+ & DHCYX*DP(3,J))
+ 840 CONTINUE
+C...Express pT with respect to new axes, if sensible.
+ PXP=-(PX(3)*FOUR(IN(3*JT+3),IN(3))+PY(3)*
+ & FOUR(IN(3*JT+3)+1,IN(3)))
+ PYP=-(PX(3)*FOUR(IN(3*JT+3),IN(3)+1)+PY(3)*
+ & FOUR(IN(3*JT+3)+1,IN(3)+1))
+ IF(ABS(PXP**2+PYP**2-PX(3)**2-PY(3)**2).LT.0.01) THEN
+ PX(3)=PXP
+ PY(3)=PYP
+ ENDIF
+ ENDIF
+
+C...Sum up known four-momentum. Gives coefficients for m2 expression.
+ DO 870 J=1,4
+ DHG(J)=0.
+ P(I,J)=PX(JT)*P(IN(3*JT+3),J)+PY(JT)*P(IN(3*JT+3)+1,J)+
+ &PX(3)*P(IN(3),J)+PY(3)*P(IN(3)+1,J)
+ DO 850 IN1=IN(3*JT+1),IN(1)-4*JS,4*JS
+ P(I,J)=P(I,J)+P(IN1+2,3)*P(IN1,J)
+ 850 CONTINUE
+ DO 860 IN2=IN(3*JT+2),IN(2)-4*JS,4*JS
+ P(I,J)=P(I,J)+P(IN2+2,3)*P(IN2,J)
+ 860 CONTINUE
+ 870 CONTINUE
+ DHM(1)=FOUR(I,I)
+ DHM(2)=2.*FOUR(I,IN(1))
+ DHM(3)=2.*FOUR(I,IN(2))
+ DHM(4)=2.*FOUR(IN(1),IN(2))
+
+C...Find coefficients for Gamma expression.
+ DO 890 IN2=IN(1)+1,IN(2),4
+ DO 880 IN1=IN(1),IN2-1,4
+ DHC=2.*FOUR(IN1,IN2)
+ DHG(1)=DHG(1)+P(IN1+2,JT)*P(IN2+2,JT)*DHC
+ IF(IN1.EQ.IN(1)) DHG(2)=DHG(2)-JS*P(IN2+2,JT)*DHC
+ IF(IN2.EQ.IN(2)) DHG(3)=DHG(3)+JS*P(IN1+2,JT)*DHC
+ IF(IN1.EQ.IN(1).AND.IN2.EQ.IN(2)) DHG(4)=DHG(4)-DHC
+ 880 CONTINUE
+ 890 CONTINUE
+
+C...Solve (m2, Gamma) equation system for energies taken.
+ DHS1=DHM(JR+1)*DHG(4)-DHM(4)*DHG(JR+1)
+ IF(ABS(DHS1).LT.1D-4) GOTO 640
+ DHS2=DHM(4)*(GAM(3)-DHG(1))-DHM(JT+1)*DHG(JR+1)-DHG(4)*
+ &(P(I,5)**2-DHM(1))+DHG(JT+1)*DHM(JR+1)
+ DHS3=DHM(JT+1)*(GAM(3)-DHG(1))-DHG(JT+1)*(P(I,5)**2-DHM(1))
+ P(IN(JR)+2,4)=0.5*(SQRT(MAX(0D0,DHS2**2-4.*DHS1*DHS3))/ABS(DHS1)-
+ &DHS2/DHS1)
+ IF(DHM(JT+1)+DHM(4)*P(IN(JR)+2,4).LE.0.) GOTO 640
+ P(IN(JT)+2,4)=(P(I,5)**2-DHM(1)-DHM(JR+1)*P(IN(JR)+2,4))/
+ &(DHM(JT+1)+DHM(4)*P(IN(JR)+2,4))
+
+C...Step to new region if necessary.
+ IF(P(IN(JR)+2,4).GT.P(IN(JR)+2,3)) THEN
+ P(IN(JR)+2,4)=P(IN(JR)+2,3)
+ P(IN(JR)+2,JT)=1.
+ IN(JR)=IN(JR)+4*JS
+ IF(JS*IN(JR).GT.JS*IN(4*JR)) GOTO 640
+ IF(FOUR(IN(1),IN(2)).LE.1D-2) THEN
+ P(IN(JT)+2,4)=P(IN(JT)+2,3)
+ P(IN(JT)+2,JT)=0.
+ IN(JT)=IN(JT)+4*JS
+ ENDIF
+ GOTO 820
+ ELSEIF(P(IN(JT)+2,4).GT.P(IN(JT)+2,3)) THEN
+ P(IN(JT)+2,4)=P(IN(JT)+2,3)
+ P(IN(JT)+2,JT)=0.
+ IN(JT)=IN(JT)+4*JS
+ GOTO 820
+ ENDIF
+
+C...Four-momentum of particle. Remaining quantities. Loop back.
+ 900 DO 910 J=1,4
+ P(I,J)=P(I,J)+P(IN(1)+2,4)*P(IN(1),J)+P(IN(2)+2,4)*P(IN(2),J)
+ P(N+NRS,J)=P(N+NRS,J)-P(I,J)
+ 910 CONTINUE
+ IF(P(I,4).LT.P(I,5)) GOTO 640
+ KFL(JT)=-KFL(3)
+ PMQ(JT)=PMQ(3)
+ PX(JT)=-PX(3)
+ PY(JT)=-PY(3)
+ GAM(JT)=GAM(3)
+ IF(IN(3).NE.IN(3*JT+3)) THEN
+ DO 920 J=1,4
+ P(IN(3*JT+3),J)=P(IN(3),J)
+ P(IN(3*JT+3)+1,J)=P(IN(3)+1,J)
+ 920 CONTINUE
+ ENDIF
+ DO 930 JQ=1,2
+ IN(3*JT+JQ)=IN(JQ)
+ P(IN(JQ)+2,3)=P(IN(JQ)+2,3)-P(IN(JQ)+2,4)
+ P(IN(JQ)+2,JT)=P(IN(JQ)+2,JT)-JS*(3-2*JQ)*P(IN(JQ)+2,4)
+ 930 CONTINUE
+ GOTO 780
+
+C...Final hadron: side, flavour, hadron, mass.
+ 940 I=I+1
+ K(I,1)=1
+ K(I,3)=IE(JR)
+ K(I,4)=0
+ K(I,5)=0
+ CALL LUKFDI(KFL(JR),-KFL(3),KFLDMP,K(I,2))
+ IF(K(I,2).EQ.0) GOTO 640
+ P(I,5)=ULMASS(K(I,2))
+ PR(JR)=P(I,5)**2+(PX(JR)-PX(3))**2+(PY(JR)-PY(3))**2
+
+C...Final two hadrons: find common setup of four-vectors.
+ JQ=1
+ IF(P(IN(4)+2,3)*P(IN(5)+2,3)*FOUR(IN(4),IN(5)).LT.P(IN(7),3)*
+ &P(IN(8),3)*FOUR(IN(7),IN(8))) JQ=2
+ DHC12=FOUR(IN(3*JQ+1),IN(3*JQ+2))
+ DHR1=FOUR(N+NRS,IN(3*JQ+2))/DHC12
+ DHR2=FOUR(N+NRS,IN(3*JQ+1))/DHC12
+ IF(IN(4).NE.IN(7).OR.IN(5).NE.IN(8)) THEN
+ PX(3-JQ)=-FOUR(N+NRS,IN(3*JQ+3))-PX(JQ)
+ PY(3-JQ)=-FOUR(N+NRS,IN(3*JQ+3)+1)-PY(JQ)
+ PR(3-JQ)=P(I+(JT+JQ-3)**2-1,5)**2+(PX(3-JQ)+(2*JQ-3)*JS*
+ & PX(3))**2+(PY(3-JQ)+(2*JQ-3)*JS*PY(3))**2
+ ENDIF
+
+C...Solve kinematics for final two hadrons, if possible.
+ WREM2=WREM2+(PX(1)+PX(2))**2+(PY(1)+PY(2))**2
+ FD=(SQRT(PR(1))+SQRT(PR(2)))/SQRT(WREM2)
+ IF(MJU(1)+MJU(2).NE.0.AND.I.EQ.ISAV+2.AND.FD.GE.1.) GOTO 200
+ IF(FD.GE.1.) GOTO 640
+ FA=WREM2+PR(JT)-PR(JR)
+ IF(MSTJ(11).NE.2) PREV=0.5*EXP(MAX(-50.D0,LOG(FD)*PARJ(38)*
+ &(PR(1)+PR(2))**2))
+ IF(MSTJ(11).EQ.2) PREV=0.5*FD**PARJ(39)
+ FB=SIGN(SQRT(MAX(0.D0,FA**2-4.*WREM2*PR(JT))),JS*(RLU(0)-PREV))
+ KFL1A=IABS(KFL(1))
+ KFL2A=IABS(KFL(2))
+ IF(MAX(MOD(KFL1A,10),MOD(KFL1A/1000,10),MOD(KFL2A,10),
+ &MOD(KFL2A/1000,10)).GE.6) FB=SIGN(SQRT(MAX(0.D0,FA**2-
+ &4.*WREM2*PR(JT))),DBLE(JS))
+ DO 950 J=1,4
+ P(I-1,J)=(PX(JT)+PX(3))*P(IN(3*JQ+3),J)+(PY(JT)+PY(3))*
+ &P(IN(3*JQ+3)+1,J)+0.5*(DHR1*(FA+FB)*P(IN(3*JQ+1),J)+
+ &DHR2*(FA-FB)*P(IN(3*JQ+2),J))/WREM2
+ P(I,J)=P(N+NRS,J)-P(I-1,J)
+ 950 CONTINUE
+ IF(P(I-1,4).LT.P(I-1,5).OR.P(I,4).LT.P(I,5)) GOTO 640
+
+C...Mark jets as fragmented and give daughter pointers.
+ N=I-NRS+1
+ DO 960 I=NSAV+1,NSAV+NP
+ IM=K(I,3)
+ K(IM,1)=K(IM,1)+10
+ IF(MSTU(16).NE.2) THEN
+ K(IM,4)=NSAV+1
+ K(IM,5)=NSAV+1
+ ELSE
+ K(IM,4)=NSAV+2
+ K(IM,5)=N
+ ENDIF
+ 960 CONTINUE
+
+C...Document string system. Move up particles.
+ NSAV=NSAV+1
+ K(NSAV,1)=11
+ K(NSAV,2)=92
+ K(NSAV,3)=IP
+ K(NSAV,4)=NSAV+1
+ K(NSAV,5)=N
+ DO 970 J=1,4
+ P(NSAV,J)=DPS(J)
+ V(NSAV,J)=V(IP,J)
+ 970 CONTINUE
+ P(NSAV,5)=SQRT(MAX(0D0,DPS(4)**2-DPS(1)**2-DPS(2)**2-DPS(3)**2))
+ V(NSAV,5)=0.
+ DO 990 I=NSAV+1,N
+ DO 980 J=1,5
+ K(I,J)=K(I+NRS-1,J)
+ P(I,J)=P(I+NRS-1,J)
+ V(I,J)=0.
+ 980 CONTINUE
+ 990 CONTINUE
+ MSTU91=MSTU(90)
+ DO 1000 IZ=MSTU90+1,MSTU91
+ MSTU9T(IZ)=MSTU(90+IZ)-NRS+1-NSAV+N
+ PARU9T(IZ)=PARU(90+IZ)
+ 1000 CONTINUE
+ MSTU(90)=MSTU90
+
+C...Order particles in rank along the chain. Update mother pointer.
+ DO 1020 I=NSAV+1,N
+ DO 1010 J=1,5
+ K(I-NSAV+N,J)=K(I,J)
+ P(I-NSAV+N,J)=P(I,J)
+ 1010 CONTINUE
+ 1020 CONTINUE
+ I1=NSAV
+ DO 1050 I=N+1,2*N-NSAV
+ IF(K(I,3).NE.IE(1)) GOTO 1050
+ I1=I1+1
+ DO 1030 J=1,5
+ K(I1,J)=K(I,J)
+ P(I1,J)=P(I,J)
+ 1030 CONTINUE
+ IF(MSTU(16).NE.2) K(I1,3)=NSAV
+ DO 1040 IZ=MSTU90+1,MSTU91
+ IF(MSTU9T(IZ).EQ.I) THEN
+ MSTU(90)=MSTU(90)+1
+ MSTU(90+MSTU(90))=I1
+ PARU(90+MSTU(90))=PARU9T(IZ)
+ ENDIF
+ 1040 CONTINUE
+ 1050 CONTINUE
+ DO 1080 I=2*N-NSAV,N+1,-1
+ IF(K(I,3).EQ.IE(1)) GOTO 1080
+ I1=I1+1
+ DO 1060 J=1,5
+ K(I1,J)=K(I,J)
+ P(I1,J)=P(I,J)
+ 1060 CONTINUE
+ IF(MSTU(16).NE.2) K(I1,3)=NSAV
+ DO 1070 IZ=MSTU90+1,MSTU91
+ IF(MSTU9T(IZ).EQ.I) THEN
+ MSTU(90)=MSTU(90)+1
+ MSTU(90+MSTU(90))=I1
+ PARU(90+MSTU(90))=PARU9T(IZ)
+ ENDIF
+ 1070 CONTINUE
+ 1080 CONTINUE
+
+C...Boost back particle system. Set production vertices.
+ IF(MBST.EQ.0) THEN
+ MSTU(33)=1
+ CALL LUDBRB(NSAV+1,N,0.D0,0.D0,DPS(1)/DPS(4),DPS(2)/DPS(4),
+ & DPS(3)/DPS(4))
+ ELSE
+ DO 1090 I=NSAV+1,N
+ HHPMT=P(I,1)**2+P(I,2)**2+P(I,5)**2
+ IF(P(I,3).GT.0.) THEN
+ HHPEZ=(P(I,4)+P(I,3))*HHBZ
+ P(I,3)=0.5*(HHPEZ-HHPMT/HHPEZ)
+ P(I,4)=0.5*(HHPEZ+HHPMT/HHPEZ)
+ ELSE
+ HHPEZ=(P(I,4)-P(I,3))/HHBZ
+ P(I,3)=-0.5*(HHPEZ-HHPMT/HHPEZ)
+ P(I,4)=0.5*(HHPEZ+HHPMT/HHPEZ)
+ ENDIF
+ 1090 CONTINUE
+ ENDIF
+ DO 1110 I=NSAV+1,N
+ DO 1100 J=1,4
+ V(I,J)=V(IP,J)
+ 1100 CONTINUE
+ 1110 CONTINUE
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUINDF
+ SUBROUTINE LUINDF(IP)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to handle the fragmentation of a jet system (or a single
+C...jet) according to independent fragmentation models.
+C IMPLICIT DOUBLE PRECISION(D)
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+ DIMENSION DPS(5),PSI(4),NFI(3),NFL(3),IFET(3),KFLF(3),
+ &KFLO(2),PXO(2),PYO(2),WO(2)
+
+C...Reset counters. Identify parton system and take copy. Check flavour.
+ NSAV=N
+ MSTU90=MSTU(90)
+ NJET=0
+ KQSUM=0
+ DO 100 J=1,5
+ DPS(J)=0.
+ 100 CONTINUE
+ I=IP-1
+ 110 I=I+1
+ IF(I.GT.MIN(N,MSTU(4)-MSTU(32))) THEN
+ CALL LUERRM(12,'(LUINDF:) failed to reconstruct jet system')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ IF(K(I,1).NE.1.AND.K(I,1).NE.2) GOTO 110
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0) GOTO 110
+ KQ=KCHG(KC,2)*ISIGN(1,K(I,2))
+ IF(KQ.EQ.0) GOTO 110
+ NJET=NJET+1
+ IF(KQ.NE.2) KQSUM=KQSUM+KQ
+ DO 120 J=1,5
+ K(NSAV+NJET,J)=K(I,J)
+ P(NSAV+NJET,J)=P(I,J)
+ DPS(J)=DPS(J)+P(I,J)
+ 120 CONTINUE
+ K(NSAV+NJET,3)=I
+ IF(K(I,1).EQ.2.OR.(MSTJ(3).LE.5.AND.N.GT.I.AND.
+ &K(I+1,1).EQ.2)) GOTO 110
+ IF(NJET.NE.1.AND.KQSUM.NE.0) THEN
+ CALL LUERRM(12,'(LUINDF:) unphysical flavour combination')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+
+C...Boost copied system to CM frame. Find CM energy and sum flavours.
+ IF(NJET.NE.1) THEN
+ MSTU(33)=1
+ CALL LUDBRB(NSAV+1,NSAV+NJET,0.D0,0.D0,-DPS(1)/DPS(4),
+ & -DPS(2)/DPS(4),-DPS(3)/DPS(4))
+ ENDIF
+ PECM=0.
+ DO 130 J=1,3
+ NFI(J)=0
+ 130 CONTINUE
+ DO 140 I=NSAV+1,NSAV+NJET
+ PECM=PECM+P(I,4)
+ KFA=IABS(K(I,2))
+ IF(KFA.LE.3) THEN
+ NFI(KFA)=NFI(KFA)+ISIGN(1,K(I,2))
+ ELSEIF(KFA.GT.1000) THEN
+ KFLA=MOD(KFA/1000,10)
+ KFLB=MOD(KFA/100,10)
+ IF(KFLA.LE.3) NFI(KFLA)=NFI(KFLA)+ISIGN(1,K(I,2))
+ IF(KFLB.LE.3) NFI(KFLB)=NFI(KFLB)+ISIGN(1,K(I,2))
+ ENDIF
+ 140 CONTINUE
+
+C...Loop over attempts made. Reset counters.
+ NTRY=0
+ 150 NTRY=NTRY+1
+ IF(NTRY.GT.200) THEN
+ CALL LUERRM(14,'(LUINDF:) caught in infinite loop')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ N=NSAV+NJET
+ MSTU(90)=MSTU90
+ DO 160 J=1,3
+ NFL(J)=NFI(J)
+ IFET(J)=0
+ KFLF(J)=0
+ 160 CONTINUE
+
+C...Loop over jets to be fragmented.
+ DO 230 IP1=NSAV+1,NSAV+NJET
+ MSTJ(91)=0
+ NSAV1=N
+ MSTU91=MSTU(90)
+
+C...Initial flavour and momentum values. Jet along +z axis.
+ KFLH=IABS(K(IP1,2))
+ IF(KFLH.GT.10) KFLH=MOD(KFLH/1000,10)
+ KFLO(2)=0
+ WF=P(IP1,4)+SQRT(P(IP1,1)**2+P(IP1,2)**2+P(IP1,3)**2)
+
+C...Initial values for quark or diquark jet.
+ 170 IF(IABS(K(IP1,2)).NE.21) THEN
+ NSTR=1
+ KFLO(1)=K(IP1,2)
+ CALL LUPTDI(0,PXO(1),PYO(1))
+ WO(1)=WF
+
+C...Initial values for gluon treated like random quark jet.
+ ELSEIF(MSTJ(2).LE.2) THEN
+ NSTR=1
+ IF(MSTJ(2).EQ.2) MSTJ(91)=1
+ KFLO(1)=INT(1.+(2.+PARJ(2))*RLU(0))*(-1)**INT(RLU(0)+0.5)
+ CALL LUPTDI(0,PXO(1),PYO(1))
+ WO(1)=WF
+
+C...Initial values for gluon treated like quark-antiquark jet pair,
+C...sharing energy according to Altarelli-Parisi splitting function.
+ ELSE
+ NSTR=2
+ IF(MSTJ(2).EQ.4) MSTJ(91)=1
+ KFLO(1)=INT(1.+(2.+PARJ(2))*RLU(0))*(-1)**INT(RLU(0)+0.5)
+ KFLO(2)=-KFLO(1)
+ CALL LUPTDI(0,PXO(1),PYO(1))
+ PXO(2)=-PXO(1)
+ PYO(2)=-PYO(1)
+ WO(1)=WF*RLU(0)**(1./3.)
+ WO(2)=WF-WO(1)
+ ENDIF
+
+C...Initial values for rank, flavour, pT and W+.
+ DO 220 ISTR=1,NSTR
+ 180 I=N
+ MSTU(90)=MSTU91
+ IRANK=0
+ KFL1=KFLO(ISTR)
+ PX1=PXO(ISTR)
+ PY1=PYO(ISTR)
+ W=WO(ISTR)
+
+C...New hadron. Generate flavour and hadron species.
+ 190 I=I+1
+ IF(I.GE.MSTU(4)-MSTU(32)-NJET-5) THEN
+ CALL LUERRM(11,'(LUINDF:) no more memory left in LUJETS')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ IRANK=IRANK+1
+ K(I,1)=1
+ K(I,3)=IP1
+ K(I,4)=0
+ K(I,5)=0
+ 200 CALL LUKFDI(KFL1,0,KFL2,K(I,2))
+ IF(K(I,2).EQ.0) GOTO 180
+ IF(MSTJ(12).GE.3.AND.IRANK.EQ.1.AND.IABS(KFL1).LE.10.AND.
+ &IABS(KFL2).GT.10) THEN
+ IF(RLU(0).GT.PARJ(19)) GOTO 200
+ ENDIF
+
+C...Find hadron mass. Generate four-momentum.
+ P(I,5)=ULMASS(K(I,2))
+ CALL LUPTDI(KFL1,PX2,PY2)
+ P(I,1)=PX1+PX2
+ P(I,2)=PY1+PY2
+ PR=P(I,5)**2+P(I,1)**2+P(I,2)**2
+ CALL LUZDIS(KFL1,KFL2,PR,Z)
+ MZSAV=0
+ IF(IABS(KFL1).GE.4.AND.IABS(KFL1).LE.8.AND.MSTU(90).LT.8) THEN
+ MZSAV=1
+ MSTU(90)=MSTU(90)+1
+ MSTU(90+MSTU(90))=I
+ PARU(90+MSTU(90))=Z
+ ENDIF
+ P(I,3)=0.5*(Z*W-PR/MAX(1D-4,Z*W))
+ P(I,4)=0.5*(Z*W+PR/MAX(1D-4,Z*W))
+ IF(MSTJ(3).GE.1.AND.IRANK.EQ.1.AND.KFLH.GE.4.AND.
+ &P(I,3).LE.0.001) THEN
+ IF(W.GE.P(I,5)+0.5*PARJ(32)) GOTO 180
+ P(I,3)=0.0001
+ P(I,4)=SQRT(PR)
+ Z=P(I,4)/W
+ ENDIF
+
+C...Remaining flavour and momentum.
+ KFL1=-KFL2
+ PX1=-PX2
+ PY1=-PY2
+ W=(1.-Z)*W
+ DO 210 J=1,5
+ V(I,J)=0.
+ 210 CONTINUE
+
+C...Check if pL acceptable. Go back for new hadron if enough energy.
+ IF(MSTJ(3).GE.0.AND.P(I,3).LT.0.) THEN
+ I=I-1
+ IF(MZSAV.EQ.1) MSTU(90)=MSTU(90)-1
+ ENDIF
+ IF(W.GT.PARJ(31)) GOTO 190
+ N=I
+ 220 CONTINUE
+ IF(MOD(MSTJ(3),5).EQ.4.AND.N.EQ.NSAV1) WF=WF+0.1*PARJ(32)
+ IF(MOD(MSTJ(3),5).EQ.4.AND.N.EQ.NSAV1) GOTO 170
+
+C...Rotate jet to new direction.
+ THE=ULANGL(P(IP1,3),SQRT(P(IP1,1)**2+P(IP1,2)**2))
+ PHI=ULANGL(P(IP1,1),P(IP1,2))
+ MSTU(33)=1
+ CALL LUDBRB(NSAV1+1,N,THE,PHI,0D0,0D0,0D0)
+ K(K(IP1,3),4)=NSAV1+1
+ K(K(IP1,3),5)=N
+
+C...End of jet generation loop. Skip conservation in some cases.
+ 230 CONTINUE
+ IF(NJET.EQ.1.OR.MSTJ(3).LE.0) GOTO 490
+ IF(MOD(MSTJ(3),5).NE.0.AND.N-NSAV-NJET.LT.2) GOTO 150
+
+C...Subtract off produced hadron flavours, finished if zero.
+ DO 240 I=NSAV+NJET+1,N
+ KFA=IABS(K(I,2))
+ KFLA=MOD(KFA/1000,10)
+ KFLB=MOD(KFA/100,10)
+ KFLC=MOD(KFA/10,10)
+ IF(KFLA.EQ.0) THEN
+ IF(KFLB.LE.3) NFL(KFLB)=NFL(KFLB)-ISIGN(1,K(I,2))*(-1)**KFLB
+ IF(KFLC.LE.3) NFL(KFLC)=NFL(KFLC)+ISIGN(1,K(I,2))*(-1)**KFLB
+ ELSE
+ IF(KFLA.LE.3) NFL(KFLA)=NFL(KFLA)-ISIGN(1,K(I,2))
+ IF(KFLB.LE.3) NFL(KFLB)=NFL(KFLB)-ISIGN(1,K(I,2))
+ IF(KFLC.LE.3) NFL(KFLC)=NFL(KFLC)-ISIGN(1,K(I,2))
+ ENDIF
+ 240 CONTINUE
+ NREQ=(IABS(NFL(1))+IABS(NFL(2))+IABS(NFL(3))-IABS(NFL(1)+
+ &NFL(2)+NFL(3)))/2+IABS(NFL(1)+NFL(2)+NFL(3))/3
+ IF(NREQ.EQ.0) GOTO 320
+
+C...Take away flavour of low-momentum particles until enough freedom.
+ NREM=0
+ 250 IREM=0
+ P2MIN=PECM**2
+ DO 260 I=NSAV+NJET+1,N
+ P2=P(I,1)**2+P(I,2)**2+P(I,3)**2
+ IF(K(I,1).EQ.1.AND.P2.LT.P2MIN) IREM=I
+ IF(K(I,1).EQ.1.AND.P2.LT.P2MIN) P2MIN=P2
+ 260 CONTINUE
+ IF(IREM.EQ.0) GOTO 150
+ K(IREM,1)=7
+ KFA=IABS(K(IREM,2))
+ KFLA=MOD(KFA/1000,10)
+ KFLB=MOD(KFA/100,10)
+ KFLC=MOD(KFA/10,10)
+ IF(KFLA.GE.4.OR.KFLB.GE.4) K(IREM,1)=8
+ IF(K(IREM,1).EQ.8) GOTO 250
+ IF(KFLA.EQ.0) THEN
+ ISGN=ISIGN(1,K(IREM,2))*(-1)**KFLB
+ IF(KFLB.LE.3) NFL(KFLB)=NFL(KFLB)+ISGN
+ IF(KFLC.LE.3) NFL(KFLC)=NFL(KFLC)-ISGN
+ ELSE
+ IF(KFLA.LE.3) NFL(KFLA)=NFL(KFLA)+ISIGN(1,K(IREM,2))
+ IF(KFLB.LE.3) NFL(KFLB)=NFL(KFLB)+ISIGN(1,K(IREM,2))
+ IF(KFLC.LE.3) NFL(KFLC)=NFL(KFLC)+ISIGN(1,K(IREM,2))
+ ENDIF
+ NREM=NREM+1
+ NREQ=(IABS(NFL(1))+IABS(NFL(2))+IABS(NFL(3))-IABS(NFL(1)+
+ &NFL(2)+NFL(3)))/2+IABS(NFL(1)+NFL(2)+NFL(3))/3
+ IF(NREQ.GT.NREM) GOTO 250
+ DO 270 I=NSAV+NJET+1,N
+ IF(K(I,1).EQ.8) K(I,1)=1
+ 270 CONTINUE
+
+C...Find combination of existing and new flavours for hadron.
+ 280 NFET=2
+ IF(NFL(1)+NFL(2)+NFL(3).NE.0) NFET=3
+ IF(NREQ.LT.NREM) NFET=1
+ IF(IABS(NFL(1))+IABS(NFL(2))+IABS(NFL(3)).EQ.0) NFET=0
+ DO 290 J=1,NFET
+ IFET(J)=1+(IABS(NFL(1))+IABS(NFL(2))+IABS(NFL(3)))*RLU(0)
+ KFLF(J)=ISIGN(1,NFL(1))
+ IF(IFET(J).GT.IABS(NFL(1))) KFLF(J)=ISIGN(2,NFL(2))
+ IF(IFET(J).GT.IABS(NFL(1))+IABS(NFL(2))) KFLF(J)=ISIGN(3,NFL(3))
+ 290 CONTINUE
+ IF(NFET.EQ.2.AND.(IFET(1).EQ.IFET(2).OR.KFLF(1)*KFLF(2).GT.0))
+ &GOTO 280
+ IF(NFET.EQ.3.AND.(IFET(1).EQ.IFET(2).OR.IFET(1).EQ.IFET(3).OR.
+ &IFET(2).EQ.IFET(3).OR.KFLF(1)*KFLF(2).LT.0.OR.KFLF(1)*KFLF(3)
+ &.LT.0.OR.KFLF(1)*(NFL(1)+NFL(2)+NFL(3)).LT.0)) GOTO 280
+ IF(NFET.EQ.0) KFLF(1)=1+INT((2.+PARJ(2))*RLU(0))
+ IF(NFET.EQ.0) KFLF(2)=-KFLF(1)
+ IF(NFET.EQ.1) KFLF(2)=ISIGN(1+INT((2.+PARJ(2))*RLU(0)),-KFLF(1))
+ IF(NFET.LE.2) KFLF(3)=0
+ IF(KFLF(3).NE.0) THEN
+ KFLFC=ISIGN(1000*MAX(IABS(KFLF(1)),IABS(KFLF(3)))+
+ & 100*MIN(IABS(KFLF(1)),IABS(KFLF(3)))+1,KFLF(1))
+ IF(KFLF(1).EQ.KFLF(3).OR.(1.+3.*PARJ(4))*RLU(0).GT.1.)
+ & KFLFC=KFLFC+ISIGN(2,KFLFC)
+ ELSE
+ KFLFC=KFLF(1)
+ ENDIF
+ CALL LUKFDI(KFLFC,KFLF(2),KFLDMP,KF)
+ IF(KF.EQ.0) GOTO 280
+ DO 300 J=1,MAX(2,NFET)
+ NFL(IABS(KFLF(J)))=NFL(IABS(KFLF(J)))-ISIGN(1,KFLF(J))
+ 300 CONTINUE
+
+C...Store hadron at random among free positions.
+ NPOS=MIN(1+INT(RLU(0)*NREM),NREM)
+ DO 310 I=NSAV+NJET+1,N
+ IF(K(I,1).EQ.7) NPOS=NPOS-1
+ IF(K(I,1).EQ.1.OR.NPOS.NE.0) GOTO 310
+ K(I,1)=1
+ K(I,2)=KF
+ P(I,5)=ULMASS(K(I,2))
+ P(I,4)=SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2+P(I,5)**2)
+ 310 CONTINUE
+ NREM=NREM-1
+ NREQ=(IABS(NFL(1))+IABS(NFL(2))+IABS(NFL(3))-IABS(NFL(1)+
+ &NFL(2)+NFL(3)))/2+IABS(NFL(1)+NFL(2)+NFL(3))/3
+ IF(NREM.GT.0) GOTO 280
+
+C...Compensate for missing momentum in global scheme (3 options).
+ 320 IF(MOD(MSTJ(3),5).NE.0.AND.MOD(MSTJ(3),5).NE.4) THEN
+ DO 340 J=1,3
+ PSI(J)=0.
+ DO 330 I=NSAV+NJET+1,N
+ PSI(J)=PSI(J)+P(I,J)
+ 330 CONTINUE
+ 340 CONTINUE
+ PSI(4)=PSI(1)**2+PSI(2)**2+PSI(3)**2
+ PWS=0.
+ DO 350 I=NSAV+NJET+1,N
+ IF(MOD(MSTJ(3),5).EQ.1) PWS=PWS+P(I,4)
+ IF(MOD(MSTJ(3),5).EQ.2) PWS=PWS+SQRT(P(I,5)**2+(PSI(1)*P(I,1)+
+ & PSI(2)*P(I,2)+PSI(3)*P(I,3))**2/PSI(4))
+ IF(MOD(MSTJ(3),5).EQ.3) PWS=PWS+1.
+ 350 CONTINUE
+ DO 370 I=NSAV+NJET+1,N
+ IF(MOD(MSTJ(3),5).EQ.1) PW=P(I,4)
+ IF(MOD(MSTJ(3),5).EQ.2) PW=SQRT(P(I,5)**2+(PSI(1)*P(I,1)+
+ & PSI(2)*P(I,2)+PSI(3)*P(I,3))**2/PSI(4))
+ IF(MOD(MSTJ(3),5).EQ.3) PW=1.
+ DO 360 J=1,3
+ P(I,J)=P(I,J)-PSI(J)*PW/PWS
+ 360 CONTINUE
+ P(I,4)=SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2+P(I,5)**2)
+ 370 CONTINUE
+
+C...Compensate for missing momentum withing each jet separately.
+ ELSEIF(MOD(MSTJ(3),5).EQ.4) THEN
+ DO 390 I=N+1,N+NJET
+ K(I,1)=0
+ DO 380 J=1,5
+ P(I,J)=0.
+ 380 CONTINUE
+ 390 CONTINUE
+ DO 410 I=NSAV+NJET+1,N
+ IR1=K(I,3)
+ IR2=N+IR1-NSAV
+ K(IR2,1)=K(IR2,1)+1
+ PLS=(P(I,1)*P(IR1,1)+P(I,2)*P(IR1,2)+P(I,3)*P(IR1,3))/
+ & (P(IR1,1)**2+P(IR1,2)**2+P(IR1,3)**2)
+ DO 400 J=1,3
+ P(IR2,J)=P(IR2,J)+P(I,J)-PLS*P(IR1,J)
+ 400 CONTINUE
+ P(IR2,4)=P(IR2,4)+P(I,4)
+ P(IR2,5)=P(IR2,5)+PLS
+ 410 CONTINUE
+ PSS=0.
+ DO 420 I=N+1,N+NJET
+ IF(K(I,1).NE.0) PSS=PSS+P(I,4)/(PECM*(0.8*P(I,5)+0.2))
+ 420 CONTINUE
+ DO 440 I=NSAV+NJET+1,N
+ IR1=K(I,3)
+ IR2=N+IR1-NSAV
+ PLS=(P(I,1)*P(IR1,1)+P(I,2)*P(IR1,2)+P(I,3)*P(IR1,3))/
+ & (P(IR1,1)**2+P(IR1,2)**2+P(IR1,3)**2)
+ DO 430 J=1,3
+ P(I,J)=P(I,J)-P(IR2,J)/K(IR2,1)+(1./(P(IR2,5)*PSS)-1.)*PLS*
+ & P(IR1,J)
+ 430 CONTINUE
+ P(I,4)=SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2+P(I,5)**2)
+ 440 CONTINUE
+ ENDIF
+
+C...Scale momenta for energy conservation.
+ IF(MOD(MSTJ(3),5).NE.0) THEN
+ PMS=0.
+ PES=0.
+ PQS=0.
+ DO 450 I=NSAV+NJET+1,N
+ PMS=PMS+P(I,5)
+ PES=PES+P(I,4)
+ PQS=PQS+P(I,5)**2/P(I,4)
+ 450 CONTINUE
+ IF(PMS.GE.PECM) GOTO 150
+ NECO=0
+ 460 NECO=NECO+1
+ PFAC=(PECM-PQS)/(PES-PQS)
+ PES=0.
+ PQS=0.
+ DO 480 I=NSAV+NJET+1,N
+ DO 470 J=1,3
+ P(I,J)=PFAC*P(I,J)
+ 470 CONTINUE
+ P(I,4)=SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2+P(I,5)**2)
+ PES=PES+P(I,4)
+ PQS=PQS+P(I,5)**2/P(I,4)
+ 480 CONTINUE
+ IF(NECO.LT.10.AND.ABS(PECM-PES).GT.2D-6*PECM) GOTO 460
+ ENDIF
+
+C...Origin of produced particles and parton daughter pointers.
+ 490 DO 500 I=NSAV+NJET+1,N
+ IF(MSTU(16).NE.2) K(I,3)=NSAV+1
+ IF(MSTU(16).EQ.2) K(I,3)=K(K(I,3),3)
+ 500 CONTINUE
+ DO 510 I=NSAV+1,NSAV+NJET
+ I1=K(I,3)
+ K(I1,1)=K(I1,1)+10
+ IF(MSTU(16).NE.2) THEN
+ K(I1,4)=NSAV+1
+ K(I1,5)=NSAV+1
+ ELSE
+ K(I1,4)=K(I1,4)-NJET+1
+ K(I1,5)=K(I1,5)-NJET+1
+ IF(K(I1,5).LT.K(I1,4)) THEN
+ K(I1,4)=0
+ K(I1,5)=0
+ ENDIF
+ ENDIF
+ 510 CONTINUE
+
+C...Document independent fragmentation system. Remove copy of jets.
+ NSAV=NSAV+1
+ K(NSAV,1)=11
+ K(NSAV,2)=93
+ K(NSAV,3)=IP
+ K(NSAV,4)=NSAV+1
+ K(NSAV,5)=N-NJET+1
+ DO 520 J=1,4
+ P(NSAV,J)=DPS(J)
+ V(NSAV,J)=V(IP,J)
+ 520 CONTINUE
+ P(NSAV,5)=SQRT(MAX(0D0,DPS(4)**2-DPS(1)**2-DPS(2)**2-DPS(3)**2))
+ V(NSAV,5)=0.
+ DO 540 I=NSAV+NJET,N
+ DO 530 J=1,5
+ K(I-NJET+1,J)=K(I,J)
+ P(I-NJET+1,J)=P(I,J)
+ V(I-NJET+1,J)=V(I,J)
+ 530 CONTINUE
+ 540 CONTINUE
+ N=N-NJET+1
+ DO 550 IZ=MSTU90+1,MSTU(90)
+ MSTU(90+IZ)=MSTU(90+IZ)-NJET+1
+ 550 CONTINUE
+
+C...Boost back particle system. Set production vertices.
+ IF(NJET.NE.1) CALL LUDBRB(NSAV+1,N,0.D0,0.D0,DPS(1)/DPS(4),
+ &DPS(2)/DPS(4),DPS(3)/DPS(4))
+ DO 570 I=NSAV+1,N
+ DO 560 J=1,4
+ V(I,J)=V(IP,J)
+ 560 CONTINUE
+ 570 CONTINUE
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUDECY
+ SUBROUTINE LUDECY(IP)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to handle the decay of unstable particles.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/,/LUDAT3/
+ DIMENSION VDCY(4),KFLO(4),KFL1(4),PV(10,5),RORD(10),UE(3),BE(3),
+ &WTCOR(10),PTAU(4),PCMTAU(4)
+C DOUBLE PRECISION DBETAU(3)
+ DIMENSION DBETAU(3)
+ DATA WTCOR/2.,5.,15.,60.,250.,1500.,1.2E4,1.2E5,150.,16./
+
+C...Functions: momentum in two-particle decays, four-product and
+C...matrix element times phase space in weak decays.
+ PAWT(A,B,C)=SQRT((A**2-(B+C)**2)*(A**2-(B-C)**2))/(2.*A)
+ FOUR(I,J)=P(I,4)*P(J,4)-P(I,1)*P(J,1)-P(I,2)*P(J,2)-P(I,3)*P(J,3)
+ HMEPS(HA)=((1.-HRQ-HA)**2+3.*HA*(1.+HRQ-HA))*
+ &SQRT((1.-HRQ-HA)**2-4.*HRQ*HA)
+
+C...Initial values.
+ NTRY=0
+ NSAV=N
+ KFA=IABS(K(IP,2))
+ KFS=ISIGN(1,K(IP,2))
+ KC=LUCOMP(KFA)
+ MSTJ(92)=0
+
+C...Choose lifetime and determine decay vertex.
+ IF(K(IP,1).EQ.5) THEN
+ V(IP,5)=0.
+ ELSEIF(K(IP,1).NE.4) THEN
+ V(IP,5)=-PMAS(KC,4)*LOG(RLU(0))
+ ENDIF
+ DO 100 J=1,4
+ VDCY(J)=V(IP,J)+V(IP,5)*P(IP,J)/P(IP,5)
+ 100 CONTINUE
+
+C...Determine whether decay allowed or not.
+ MOUT=0
+ IF(MSTJ(22).EQ.2) THEN
+ IF(PMAS(KC,4).GT.PARJ(71)) MOUT=1
+ ELSEIF(MSTJ(22).EQ.3) THEN
+ IF(VDCY(1)**2+VDCY(2)**2+VDCY(3)**2.GT.PARJ(72)**2) MOUT=1
+ ELSEIF(MSTJ(22).EQ.4) THEN
+ IF(VDCY(1)**2+VDCY(2)**2.GT.PARJ(73)**2) MOUT=1
+ IF(ABS(VDCY(3)).GT.PARJ(74)) MOUT=1
+ ENDIF
+ IF(MOUT.EQ.1.AND.K(IP,1).NE.5) THEN
+ K(IP,1)=4
+ RETURN
+ ENDIF
+
+C...Interface to external tau decay library (for tau polarization).
+ IF(KFA.EQ.15.AND.MSTJ(28).GE.1) THEN
+
+C...Starting values for pointers and momenta.
+ ITAU=IP
+ DO 110 J=1,4
+ PTAU(J)=P(ITAU,J)
+ PCMTAU(J)=P(ITAU,J)
+ 110 CONTINUE
+
+C...Iterate to find position and code of mother of tau.
+ IMTAU=ITAU
+ 120 IMTAU=K(IMTAU,3)
+
+ IF(IMTAU.EQ.0) THEN
+C...If no known origin then impossible to do anything further.
+ KFORIG=0
+ IORIG=0
+
+ ELSEIF(K(IMTAU,2).EQ.K(ITAU,2)) THEN
+C...If tau -> tau + gamma then add gamma energy and loop.
+ IF(K(K(IMTAU,4),2).EQ.22) THEN
+ DO 130 J=1,4
+ PCMTAU(J)=PCMTAU(J)+P(K(IMTAU,4),J)
+ 130 CONTINUE
+ ELSEIF(K(K(IMTAU,5),2).EQ.22) THEN
+ DO 140 J=1,4
+ PCMTAU(J)=PCMTAU(J)+P(K(IMTAU,5),J)
+ 140 CONTINUE
+ ENDIF
+ GOTO 120
+
+ ELSEIF(IABS(K(IMTAU,2)).GT.100) THEN
+C...If coming from weak decay of hadron then W is not stored in record,
+C...but can be reconstructed by adding neutrino momentum.
+ KFORIG=-ISIGN(24,K(ITAU,2))
+ IORIG=0
+ DO 160 II=K(IMTAU,4),K(IMTAU,5)
+ IF(K(II,2)*ISIGN(1,K(ITAU,2)).EQ.-16) THEN
+ DO 150 J=1,4
+ PCMTAU(J)=PCMTAU(J)+P(II,J)
+ 150 CONTINUE
+ ENDIF
+ 160 CONTINUE
+
+ ELSE
+C...If coming from resonance decay then find latest copy of this
+C...resonance (may not completely agree).
+ KFORIG=K(IMTAU,2)
+ IORIG=IMTAU
+ DO 170 II=IMTAU+1,IP-1
+ IF(K(II,2).EQ.KFORIG.AND.K(II,3).EQ.IORIG.AND.
+ & ABS(P(II,5)-P(IORIG,5)).LT.1D-5*P(IORIG,5)) IORIG=II
+ 170 CONTINUE
+ DO 180 J=1,4
+ PCMTAU(J)=P(IORIG,J)
+ 180 CONTINUE
+ ENDIF
+
+C...Boost tau to rest frame of production process (where known)
+C...and rotate it to sit along +z axis.
+ DO 190 J=1,3
+ DBETAU(J)=PCMTAU(J)/PCMTAU(4)
+ 190 CONTINUE
+ IF(KFORIG.NE.0) CALL LUDBRB(ITAU,ITAU,0.D0,0.D0,-DBETAU(1),
+ & -DBETAU(2),-DBETAU(3))
+ PHITAU=ULANGL(P(ITAU,1),P(ITAU,2))
+ CALL LUDBRB(ITAU,ITAU,0.D0,-PHITAU,0D0,0D0,0D0)
+ THETAU=ULANGL(P(ITAU,3),P(ITAU,1))
+ CALL LUDBRB(ITAU,ITAU,-THETAU,0.D0,0D0,0D0,0D0)
+
+C...Call tau decay routine (if meaningful) and fill extra info.
+ IF(KFORIG.NE.0.OR.MSTJ(28).EQ.2) THEN
+ CALL LUTAUD(ITAU,IORIG,KFORIG,NDECAY)
+ DO 200 II=NSAV+1,NSAV+NDECAY
+ K(II,1)=1
+ K(II,3)=IP
+ K(II,4)=0
+ K(II,5)=0
+ 200 CONTINUE
+ N=NSAV+NDECAY
+ ENDIF
+
+C...Boost back decay tau and decay products.
+ DO 210 J=1,4
+ P(ITAU,J)=PTAU(J)
+ 210 CONTINUE
+ IF(KFORIG.NE.0.OR.MSTJ(28).EQ.2) THEN
+ CALL LUDBRB(NSAV+1,N,THETAU,PHITAU,0D0,0D0,0D0)
+ IF(KFORIG.NE.0) CALL LUDBRB(NSAV+1,N,0.D0,0.D0,DBETAU(1),
+ & DBETAU(2),DBETAU(3))
+
+C...Skip past ordinary tau decay treatment.
+ MMAT=0
+ MBST=0
+ ND=0
+ GOTO 660
+ ENDIF
+ ENDIF
+
+C...B-B~ mixing: flip sign of meson appropriately.
+ MMIX=0
+ IF((KFA.EQ.511.OR.KFA.EQ.531).AND.MSTJ(26).GE.1) THEN
+ XBBMIX=PARJ(76)
+ IF(KFA.EQ.531) XBBMIX=PARJ(77)
+ IF(SIN(0.5*XBBMIX*V(IP,5)/PMAS(KC,4))**2.GT.RLU(0)) MMIX=1
+ IF(MMIX.EQ.1) KFS=-KFS
+ ENDIF
+
+C...Check existence of decay channels. Particle/antiparticle rules.
+ KCA=KC
+ IF(MDCY(KC,2).GT.0) THEN
+ MDMDCY=MDME(MDCY(KC,2),2)
+ IF(MDMDCY.GT.80.AND.MDMDCY.LE.90) KCA=MDMDCY
+ ENDIF
+ IF(MDCY(KCA,2).LE.0.OR.MDCY(KCA,3).LE.0) THEN
+ CALL LUERRM(9,'(LUDECY:) no decay channel defined')
+ RETURN
+ ENDIF
+ IF(MOD(KFA/1000,10).EQ.0.AND.(KCA.EQ.85.OR.KCA.EQ.87)) KFS=-KFS
+ IF(KCHG(KC,3).EQ.0) THEN
+ KFSP=1
+ KFSN=0
+ IF(RLU(0).GT.0.5) KFS=-KFS
+ ELSEIF(KFS.GT.0) THEN
+ KFSP=1
+ KFSN=0
+ ELSE
+ KFSP=0
+ KFSN=1
+ ENDIF
+
+C...Sum branching ratios of allowed decay channels.
+ 220 NOPE=0
+ BRSU=0.
+ DO 230 IDL=MDCY(KCA,2),MDCY(KCA,2)+MDCY(KCA,3)-1
+ IF(MDME(IDL,1).NE.1.AND.KFSP*MDME(IDL,1).NE.2.AND.
+ &KFSN*MDME(IDL,1).NE.3) GOTO 230
+ IF(MDME(IDL,2).GT.100) GOTO 230
+ NOPE=NOPE+1
+ BRSU=BRSU+BRAT(IDL)
+ 230 CONTINUE
+ IF(NOPE.EQ.0) THEN
+ CALL LUERRM(2,'(LUDECY:) all decay channels closed by user')
+ RETURN
+ ENDIF
+
+C...Select decay channel among allowed ones.
+ 240 RBR=BRSU*RLU(0)
+ IDL=MDCY(KCA,2)-1
+ 250 IDL=IDL+1
+ IF(MDME(IDL,1).NE.1.AND.KFSP*MDME(IDL,1).NE.2.AND.
+ &KFSN*MDME(IDL,1).NE.3) THEN
+ IF(IDL.LT.MDCY(KCA,2)+MDCY(KCA,3)-1) GOTO 250
+ ELSEIF(MDME(IDL,2).GT.100) THEN
+ IF(IDL.LT.MDCY(KCA,2)+MDCY(KCA,3)-1) GOTO 250
+ ELSE
+ IDC=IDL
+ RBR=RBR-BRAT(IDL)
+ IF(IDL.LT.MDCY(KCA,2)+MDCY(KCA,3)-1.AND.RBR.GT.0.) GOTO 250
+ ENDIF
+
+C...Start readout of decay channel: matrix element, reset counters.
+ MMAT=MDME(IDC,2)
+ 260 NTRY=NTRY+1
+ IF(NTRY.GT.1000) THEN
+ CALL LUERRM(14,'(LUDECY:) caught in infinite loop')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ I=N
+ NP=0
+ NQ=0
+ MBST=0
+ IF(MMAT.GE.11.AND.MMAT.NE.46.AND.P(IP,4).GT.20.*P(IP,5)) MBST=1
+ DO 270 J=1,4
+ PV(1,J)=0.
+ IF(MBST.EQ.0) PV(1,J)=P(IP,J)
+ 270 CONTINUE
+ IF(MBST.EQ.1) PV(1,4)=P(IP,5)
+ PV(1,5)=P(IP,5)
+ PS=0.
+ PSQ=0.
+ MREM=0
+ MHADDY=0
+ IF(KFA.GT.80) MHADDY=1
+
+C...Read out decay products. Convert to standard flavour code.
+ JTMAX=5
+ IF(MDME(IDC+1,2).EQ.101) JTMAX=10
+ DO 280 JT=1,JTMAX
+ IF(JT.LE.5) KP=KFDP(IDC,JT)
+ IF(JT.GE.6) KP=KFDP(IDC+1,JT-5)
+ IF(KP.EQ.0) GOTO 280
+ KPA=IABS(KP)
+ KCP=LUCOMP(KPA)
+ IF(KPA.GT.80) MHADDY=1
+ IF(KCHG(KCP,3).EQ.0.AND.KPA.NE.81.AND.KPA.NE.82) THEN
+ KFP=KP
+ ELSEIF(KPA.NE.81.AND.KPA.NE.82) THEN
+ KFP=KFS*KP
+ ELSEIF(KPA.EQ.81.AND.MOD(KFA/1000,10).EQ.0) THEN
+ KFP=-KFS*MOD(KFA/10,10)
+ ELSEIF(KPA.EQ.81.AND.MOD(KFA/100,10).GE.MOD(KFA/10,10)) THEN
+ KFP=KFS*(100*MOD(KFA/10,100)+3)
+ ELSEIF(KPA.EQ.81) THEN
+ KFP=KFS*(1000*MOD(KFA/10,10)+100*MOD(KFA/100,10)+1)
+ ELSEIF(KP.EQ.82) THEN
+ CALL LUKFDI(-KFS*INT(1.+(2.+PARJ(2))*RLU(0)),0,KFP,KDUMP)
+ IF(KFP.EQ.0) GOTO 260
+ MSTJ(93)=1
+ IF(PV(1,5).LT.PARJ(32)+2.*ULMASS(KFP)) GOTO 260
+ ELSEIF(KP.EQ.-82) THEN
+ KFP=-KFP
+ IF(IABS(KFP).GT.10) KFP=KFP+ISIGN(10000,KFP)
+ ENDIF
+ IF(KPA.EQ.81.OR.KPA.EQ.82) KCP=LUCOMP(KFP)
+
+C...Add decay product to event record or to quark flavour list.
+ KFPA=IABS(KFP)
+ KQP=KCHG(KCP,2)
+ IF(MMAT.GE.11.AND.MMAT.LE.30.AND.KQP.NE.0) THEN
+ NQ=NQ+1
+ KFLO(NQ)=KFP
+ MSTJ(93)=2
+ PSQ=PSQ+ULMASS(KFLO(NQ))
+ ELSEIF((MMAT.EQ.42.OR.MMAT.EQ.43.OR.MMAT.EQ.48).AND.NP.EQ.3.AND.
+ &MOD(NQ,2).EQ.1) THEN
+ NQ=NQ-1
+ PS=PS-P(I,5)
+ K(I,1)=1
+ KFI=K(I,2)
+ CALL LUKFDI(KFP,KFI,KFLDMP,K(I,2))
+ IF(K(I,2).EQ.0) GOTO 260
+ MSTJ(93)=1
+ P(I,5)=ULMASS(K(I,2))
+ PS=PS+P(I,5)
+ ELSE
+ I=I+1
+ NP=NP+1
+ IF(MMAT.NE.33.AND.KQP.NE.0) NQ=NQ+1
+ IF(MMAT.EQ.33.AND.KQP.NE.0.AND.KQP.NE.2) NQ=NQ+1
+ K(I,1)=1+MOD(NQ,2)
+ IF(MMAT.EQ.4.AND.JT.LE.2.AND.KFP.EQ.21) K(I,1)=2
+ IF(MMAT.EQ.4.AND.JT.EQ.3) K(I,1)=1
+ K(I,2)=KFP
+ K(I,3)=IP
+ K(I,4)=0
+ K(I,5)=0
+ P(I,5)=ULMASS(KFP)
+ IF(MMAT.EQ.45.AND.KFPA.EQ.89) P(I,5)=PARJ(32)
+ PS=PS+P(I,5)
+ ENDIF
+ 280 CONTINUE
+
+C...Check masses for resonance decays.
+ IF(MHADDY.EQ.0) THEN
+ IF(PS+PARJ(64).GT.PV(1,5)) GOTO 240
+ ENDIF
+
+C...Choose decay multiplicity in phase space model.
+ 290 IF(MMAT.GE.11.AND.MMAT.LE.30) THEN
+ PSP=PS
+ CNDE=PARJ(61)*LOG(MAX((PV(1,5)-PS-PSQ)/PARJ(62),1.1D0))
+ IF(MMAT.EQ.12) CNDE=CNDE+PARJ(63)
+ 300 NTRY=NTRY+1
+ IF(NTRY.GT.1000) THEN
+ CALL LUERRM(14,'(LUDECY:) caught in infinite loop')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ IF(MMAT.LE.20) THEN
+ GAUSS=SQRT(-2.*CNDE*LOG(MAX(1D-10,RLU(0))))*
+ & SIN(PARU(2)*RLU(0))
+ ND=0.5+0.5*NP+0.25*NQ+CNDE+GAUSS
+ IF(ND.LT.NP+NQ/2.OR.ND.LT.2.OR.ND.GT.10) GOTO 300
+ IF(MMAT.EQ.13.AND.ND.EQ.2) GOTO 300
+ IF(MMAT.EQ.14.AND.ND.LE.3) GOTO 300
+ IF(MMAT.EQ.15.AND.ND.LE.4) GOTO 300
+ ELSE
+ ND=MMAT-20
+ ENDIF
+
+C...Form hadrons from flavour content.
+ DO 310 JT=1,4
+ KFL1(JT)=KFLO(JT)
+ 310 CONTINUE
+ IF(ND.EQ.NP+NQ/2) GOTO 330
+ DO 320 I=N+NP+1,N+ND-NQ/2
+ JT=1+INT((NQ-1)*RLU(0))
+ CALL LUKFDI(KFL1(JT),0,KFL2,K(I,2))
+ IF(K(I,2).EQ.0) GOTO 300
+ KFL1(JT)=-KFL2
+ 320 CONTINUE
+ 330 JT=2
+ JT2=3
+ JT3=4
+ IF(NQ.EQ.4.AND.RLU(0).LT.PARJ(66)) JT=4
+ IF(JT.EQ.4.AND.ISIGN(1,KFL1(1)*(10-IABS(KFL1(1))))*
+ & ISIGN(1,KFL1(JT)*(10-IABS(KFL1(JT)))).GT.0) JT=3
+ IF(JT.EQ.3) JT2=2
+ IF(JT.EQ.4) JT3=2
+ CALL LUKFDI(KFL1(1),KFL1(JT),KFLDMP,K(N+ND-NQ/2+1,2))
+ IF(K(N+ND-NQ/2+1,2).EQ.0) GOTO 300
+ IF(NQ.EQ.4) CALL LUKFDI(KFL1(JT2),KFL1(JT3),KFLDMP,K(N+ND,2))
+ IF(NQ.EQ.4.AND.K(N+ND,2).EQ.0) GOTO 300
+
+C...Check that sum of decay product masses not too large.
+ PS=PSP
+ DO 340 I=N+NP+1,N+ND
+ K(I,1)=1
+ K(I,3)=IP
+ K(I,4)=0
+ K(I,5)=0
+ P(I,5)=ULMASS(K(I,2))
+ PS=PS+P(I,5)
+ 340 CONTINUE
+ IF(PS+PARJ(64).GT.PV(1,5)) GOTO 300
+
+C...Rescale energy to subtract off spectator quark mass.
+ ELSEIF((MMAT.EQ.31.OR.MMAT.EQ.33.OR.MMAT.EQ.44.OR.MMAT.EQ.45)
+ &.AND.NP.GE.3) THEN
+ PS=PS-P(N+NP,5)
+ PQT=(P(N+NP,5)+PARJ(65))/PV(1,5)
+ DO 350 J=1,5
+ P(N+NP,J)=PQT*PV(1,J)
+ PV(1,J)=(1.-PQT)*PV(1,J)
+ 350 CONTINUE
+ IF(PS+PARJ(64).GT.PV(1,5)) GOTO 260
+ ND=NP-1
+ MREM=1
+
+C...Phase space factors imposed in W decay.
+ ELSEIF(MMAT.EQ.46) THEN
+ MSTJ(93)=1
+ PSMC=ULMASS(K(N+1,2))
+ MSTJ(93)=1
+ PSMC=PSMC+ULMASS(K(N+2,2))
+ IF(MAX(PS,PSMC)+PARJ(32).GT.PV(1,5)) GOTO 240
+ HR1=(P(N+1,5)/PV(1,5))**2
+ HR2=(P(N+2,5)/PV(1,5))**2
+ IF((1.-HR1-HR2)*(2.+HR1+HR2)*SQRT((1.-HR1-HR2)**2-4.*HR1*HR2)
+ & .LT.2.*RLU(0)) GOTO 240
+ ND=NP
+
+C...Fully specified final state: check mass broadening effects.
+ ELSE
+ IF(NP.GE.2.AND.PS+PARJ(64).GT.PV(1,5)) GOTO 260
+ ND=NP
+ ENDIF
+
+C...Select W mass in decay Q -> W + q, without W propagator.
+ IF(MMAT.EQ.45.AND.MSTJ(25).LE.0) THEN
+ HLQ=(PARJ(32)/PV(1,5))**2
+ HUQ=(1.-(P(N+2,5)+PARJ(64))/PV(1,5))**2
+ HRQ=(P(N+2,5)/PV(1,5))**2
+ 360 HW=HLQ+RLU(0)*(HUQ-HLQ)
+ IF(HMEPS(HW).LT.RLU(0)) GOTO 360
+ P(N+1,5)=PV(1,5)*SQRT(HW)
+
+C...Ditto, including W propagator. Divide mass range into three regions.
+ ELSEIF(MMAT.EQ.45) THEN
+ HQW=(PV(1,5)/PMAS(24,1))**2
+ HLW=(PARJ(32)/PMAS(24,1))**2
+ HUW=((PV(1,5)-P(N+2,5)-PARJ(64))/PMAS(24,1))**2
+ HRQ=(P(N+2,5)/PV(1,5))**2
+ HG=PMAS(24,2)/PMAS(24,1)
+ HATL=ATAN((HLW-1.)/HG)
+ HM=MIN(1.D0,HUW-0.001)
+ HMV1=HMEPS(HM/HQW)/((HM-1.)**2+HG**2)
+ 370 HM=HM-HG
+ HMV2=HMEPS(HM/HQW)/((HM-1.)**2+HG**2)
+ IF(HMV2.GT.HMV1.AND.HM-HG.GT.HLW) THEN
+ HMV1=HMV2
+ GOTO 370
+ ENDIF
+ HMV=MIN(2.*HMV1,HMEPS(HM/HQW)/HG**2)
+ HM1=1.-SQRT(1./HMV-HG**2)
+ IF(HM1.GT.HLW.AND.HM1.LT.HM) THEN
+ HM=HM1
+ ELSEIF(HMV2.LE.HMV1) THEN
+ HM=MAX(HLW,HM-MIN(0.1D0,1.-HM))
+ ENDIF
+ HATM=ATAN((HM-1.)/HG)
+ HWT1=(HATM-HATL)/HG
+ HWT2=HMV*(MIN(1.D0,HUW)-HM)
+ HWT3=0.
+ IF(HUW.GT.1.) THEN
+ HATU=ATAN((HUW-1.)/HG)
+ HMP1=HMEPS(1./HQW)
+ HWT3=HMP1*HATU/HG
+ ENDIF
+
+C...Select mass region and W mass there. Accept according to weight.
+ 380 HREG=RLU(0)*(HWT1+HWT2+HWT3)
+ IF(HREG.LE.HWT1) THEN
+ HW=1.+HG*TAN(HATL+RLU(0)*(HATM-HATL))
+ HACC=HMEPS(HW/HQW)
+ ELSEIF(HREG.LE.HWT1+HWT2) THEN
+ HW=HM+RLU(0)*(MIN(1.D0,HUW)-HM)
+ HACC=HMEPS(HW/HQW)/((HW-1.)**2+HG**2)/HMV
+ ELSE
+ HW=1.+HG*TAN(RLU(0)*HATU)
+ HACC=HMEPS(HW/HQW)/HMP1
+ ENDIF
+ IF(HACC.LT.RLU(0)) GOTO 380
+ P(N+1,5)=PMAS(24,1)*SQRT(HW)
+ ENDIF
+
+C...Determine position of grandmother, number of sisters, Q -> W sign.
+ NM=0
+ KFAS=0
+ MSGN=0
+ IF(MMAT.EQ.3.OR.MMAT.EQ.46) THEN
+ IM=K(IP,3)
+ IF(IM.LT.0.OR.IM.GE.IP) IM=0
+ IF(MMAT.EQ.46.AND.MSTJ(27).EQ.1) THEN
+ IM=0
+ ELSEIF(MMAT.EQ.46.AND.MSTJ(27).GE.2.AND.IM.NE.0) THEN
+ IF(K(IM,2).EQ.94) THEN
+ IM=K(K(IM,3),3)
+ IF(IM.LT.0.OR.IM.GE.IP) IM=0
+ ENDIF
+ ENDIF
+ IF(IM.NE.0) KFAM=IABS(K(IM,2))
+ IF(IM.NE.0.AND.MMAT.EQ.3) THEN
+ DO 390 IL=MAX(IP-2,IM+1),MIN(IP+2,N)
+ IF(K(IL,3).EQ.IM) NM=NM+1
+ IF(K(IL,3).EQ.IM.AND.IL.NE.IP) ISIS=IL
+ 390 CONTINUE
+ IF(NM.NE.2.OR.KFAM.LE.100.OR.MOD(KFAM,10).NE.1.OR.
+ & MOD(KFAM/1000,10).NE.0) NM=0
+ IF(NM.EQ.2) THEN
+ KFAS=IABS(K(ISIS,2))
+ IF((KFAS.LE.100.OR.MOD(KFAS,10).NE.1.OR.
+ & MOD(KFAS/1000,10).NE.0).AND.KFAS.NE.22) NM=0
+ ENDIF
+ ELSEIF(IM.NE.0.AND.MMAT.EQ.46) THEN
+ MSGN=ISIGN(1,K(IM,2)*K(IP,2))
+ IF(KFAM.GT.100.AND.MOD(KFAM/1000,10).EQ.0) MSGN=
+ & MSGN*(-1)**MOD(KFAM/100,10)
+ ENDIF
+ ENDIF
+
+C...Kinematics of one-particle decays.
+ IF(ND.EQ.1) THEN
+ DO 400 J=1,4
+ P(N+1,J)=P(IP,J)
+ 400 CONTINUE
+ GOTO 660
+ ENDIF
+
+C...Calculate maximum weight ND-particle decay.
+ PV(ND,5)=P(N+ND,5)
+ IF(ND.GE.3) THEN
+ WTMAX=1./WTCOR(ND-2)
+ PMAX=PV(1,5)-PS+P(N+ND,5)
+ PMIN=0.
+ DO 410 IL=ND-1,1,-1
+ PMAX=PMAX+P(N+IL,5)
+ PMIN=PMIN+P(N+IL+1,5)
+ WTMAX=WTMAX*PAWT(PMAX,PMIN,P(N+IL,5))
+ 410 CONTINUE
+ ENDIF
+
+C...Find virtual gamma mass in Dalitz decay.
+ 420 IF(ND.EQ.2) THEN
+ ELSEIF(MMAT.EQ.2) THEN
+ PMES=4.*PMAS(11,1)**2
+ PMRHO2=PMAS(131,1)**2
+ PGRHO2=PMAS(131,2)**2
+ 430 PMST=PMES*(P(IP,5)**2/PMES)**RLU(0)
+ WT=(1+0.5*PMES/PMST)*SQRT(MAX(0.D0,1.-PMES/PMST))*
+ & (1.-PMST/P(IP,5)**2)**3*(1.+PGRHO2/PMRHO2)/
+ & ((1.-PMST/PMRHO2)**2+PGRHO2/PMRHO2)
+ IF(WT.LT.RLU(0)) GOTO 430
+ PV(2,5)=MAX(2.00001*PMAS(11,1),SQRT(PMST))
+
+C...M-generator gives weight. If rejected, try again.
+ ELSE
+ 440 RORD(1)=1.
+ DO 470 IL1=2,ND-1
+ RSAV=RLU(0)
+ DO 450 IL2=IL1-1,1,-1
+ IF(RSAV.LE.RORD(IL2)) GOTO 460
+ RORD(IL2+1)=RORD(IL2)
+ 450 CONTINUE
+ 460 RORD(IL2+1)=RSAV
+ 470 CONTINUE
+ RORD(ND)=0.
+ WT=1.
+ DO 480 IL=ND-1,1,-1
+ PV(IL,5)=PV(IL+1,5)+P(N+IL,5)+(RORD(IL)-RORD(IL+1))*(PV(1,5)-PS)
+ WT=WT*PAWT(PV(IL,5),PV(IL+1,5),P(N+IL,5))
+ 480 CONTINUE
+ IF(WT.LT.RLU(0)*WTMAX) GOTO 440
+ ENDIF
+
+C...Perform two-particle decays in respective CM frame.
+ 490 DO 510 IL=1,ND-1
+ PA=PAWT(PV(IL,5),PV(IL+1,5),P(N+IL,5))
+ UE(3)=2.*RLU(0)-1.
+ PHI=PARU(2)*RLU(0)
+ UE(1)=SQRT(1.-UE(3)**2)*COS(PHI)
+ UE(2)=SQRT(1.-UE(3)**2)*SIN(PHI)
+ DO 500 J=1,3
+ P(N+IL,J)=PA*UE(J)
+ PV(IL+1,J)=-PA*UE(J)
+ 500 CONTINUE
+ P(N+IL,4)=SQRT(PA**2+P(N+IL,5)**2)
+ PV(IL+1,4)=SQRT(PA**2+PV(IL+1,5)**2)
+ 510 CONTINUE
+
+C...Lorentz transform decay products to lab frame.
+ DO 520 J=1,4
+ P(N+ND,J)=PV(ND,J)
+ 520 CONTINUE
+ DO 560 IL=ND-1,1,-1
+ DO 530 J=1,3
+ BE(J)=PV(IL,J)/PV(IL,4)
+ 530 CONTINUE
+ GA=PV(IL,4)/PV(IL,5)
+ DO 550 I=N+IL,N+ND
+ BEP=BE(1)*P(I,1)+BE(2)*P(I,2)+BE(3)*P(I,3)
+ DO 540 J=1,3
+ P(I,J)=P(I,J)+GA*(GA*BEP/(1.+GA)+P(I,4))*BE(J)
+ 540 CONTINUE
+ P(I,4)=GA*(P(I,4)+BEP)
+ 550 CONTINUE
+ 560 CONTINUE
+
+C...Check that no infinite loop in matrix element weight.
+ NTRY=NTRY+1
+ IF(NTRY.GT.800) GOTO 590
+
+C...Matrix elements for omega and phi decays.
+ IF(MMAT.EQ.1) THEN
+ WT=(P(N+1,5)*P(N+2,5)*P(N+3,5))**2-(P(N+1,5)*FOUR(N+2,N+3))**2
+ & -(P(N+2,5)*FOUR(N+1,N+3))**2-(P(N+3,5)*FOUR(N+1,N+2))**2
+ & +2.*FOUR(N+1,N+2)*FOUR(N+1,N+3)*FOUR(N+2,N+3)
+ IF(MAX(WT*WTCOR(9)/P(IP,5)**6,0.001D0).LT.RLU(0)) GOTO 420
+
+C...Matrix elements for pi0 or eta Dalitz decay to gamma e+ e-.
+ ELSEIF(MMAT.EQ.2) THEN
+ FOUR12=FOUR(N+1,N+2)
+ FOUR13=FOUR(N+1,N+3)
+ WT=(PMST-0.5*PMES)*(FOUR12**2+FOUR13**2)+
+ & PMES*(FOUR12*FOUR13+FOUR12**2+FOUR13**2)
+ IF(WT.LT.RLU(0)*0.25*PMST*(P(IP,5)**2-PMST)**2) GOTO 490
+
+C...Matrix element for S0 -> S1 + V1 -> S1 + S2 + S3 (S scalar,
+C...V vector), of form cos**2(theta02) in V1 rest frame, and for
+C...S0 -> gamma + V1 -> gamma + S2 + S3, of form sin**2(theta02).
+ ELSEIF(MMAT.EQ.3.AND.NM.EQ.2) THEN
+ FOUR10=FOUR(IP,IM)
+ FOUR12=FOUR(IP,N+1)
+ FOUR02=FOUR(IM,N+1)
+ PMS1=P(IP,5)**2
+ PMS0=P(IM,5)**2
+ PMS2=P(N+1,5)**2
+ IF(KFAS.NE.22) HNUM=(FOUR10*FOUR12-PMS1*FOUR02)**2
+ IF(KFAS.EQ.22) HNUM=PMS1*(2.*FOUR10*FOUR12*FOUR02-
+ & PMS1*FOUR02**2-PMS0*FOUR12**2-PMS2*FOUR10**2+PMS1*PMS0*PMS2)
+ HNUM=MAX(1D-6*PMS1**2*PMS0*PMS2,HNUM)
+ HDEN=(FOUR10**2-PMS1*PMS0)*(FOUR12**2-PMS1*PMS2)
+ IF(HNUM.LT.RLU(0)*HDEN) GOTO 490
+
+C...Matrix element for "onium" -> g + g + g or gamma + g + g.
+ ELSEIF(MMAT.EQ.4) THEN
+ HX1=2.*FOUR(IP,N+1)/P(IP,5)**2
+ HX2=2.*FOUR(IP,N+2)/P(IP,5)**2
+ HX3=2.*FOUR(IP,N+3)/P(IP,5)**2
+ WT=((1.-HX1)/(HX2*HX3))**2+((1.-HX2)/(HX1*HX3))**2+
+ & ((1.-HX3)/(HX1*HX2))**2
+ IF(WT.LT.2.*RLU(0)) GOTO 420
+ IF(K(IP+1,2).EQ.22.AND.(1.-HX1)*P(IP,5)**2.LT.4.*PARJ(32)**2)
+ & GOTO 420
+
+C...Effective matrix element for nu spectrum in tau -> nu + hadrons.
+ ELSEIF(MMAT.EQ.41) THEN
+ HX1=2.*FOUR(IP,N+1)/P(IP,5)**2
+ HXM=MIN(0.75D0,2.*(1.-PS/P(IP,5)))
+ IF(HX1*(3.-2.*HX1).LT.RLU(0)*HXM*(3.-2.*HXM)) GOTO 420
+
+C...Matrix elements for weak decays (only semileptonic for c and b)
+ ELSEIF((MMAT.EQ.42.OR.MMAT.EQ.43.OR.MMAT.EQ.44.OR.MMAT.EQ.48)
+ &.AND.ND.EQ.3) THEN
+ IF(MBST.EQ.0) WT=FOUR(IP,N+1)*FOUR(N+2,N+3)
+ IF(MBST.EQ.1) WT=P(IP,5)*P(N+1,4)*FOUR(N+2,N+3)
+ IF(WT.LT.RLU(0)*P(IP,5)*PV(1,5)**3/WTCOR(10)) GOTO 420
+ ELSEIF(MMAT.EQ.42.OR.MMAT.EQ.43.OR.MMAT.EQ.44.OR.MMAT.EQ.48) THEN
+ DO 580 J=1,4
+ P(N+NP+1,J)=0.
+ DO 570 IS=N+3,N+NP
+ P(N+NP+1,J)=P(N+NP+1,J)+P(IS,J)
+ 570 CONTINUE
+ 580 CONTINUE
+ IF(MBST.EQ.0) WT=FOUR(IP,N+1)*FOUR(N+2,N+NP+1)
+ IF(MBST.EQ.1) WT=P(IP,5)*P(N+1,4)*FOUR(N+2,N+NP+1)
+ IF(WT.LT.RLU(0)*P(IP,5)*PV(1,5)**3/WTCOR(10)) GOTO 420
+
+C...Angular distribution in W decay.
+ ELSEIF(MMAT.EQ.46.AND.MSGN.NE.0) THEN
+ IF(MSGN.GT.0) WT=FOUR(IM,N+1)*FOUR(N+2,IP+1)
+ IF(MSGN.LT.0) WT=FOUR(IM,N+2)*FOUR(N+1,IP+1)
+ IF(WT.LT.RLU(0)*P(IM,5)**4/WTCOR(10)) GOTO 490
+ ENDIF
+
+C...Scale back energy and reattach spectator.
+ 590 IF(MREM.EQ.1) THEN
+ DO 600 J=1,5
+ PV(1,J)=PV(1,J)/(1.-PQT)
+ 600 CONTINUE
+ ND=ND+1
+ MREM=0
+ ENDIF
+
+C...Low invariant mass for system with spectator quark gives particle,
+C...not two jets. Readjust momenta accordingly.
+ IF((MMAT.EQ.31.OR.MMAT.EQ.45).AND.ND.EQ.3) THEN
+ MSTJ(93)=1
+ PM2=ULMASS(K(N+2,2))
+ MSTJ(93)=1
+ PM3=ULMASS(K(N+3,2))
+ IF(P(N+2,5)**2+P(N+3,5)**2+2.*FOUR(N+2,N+3).GE.
+ & (PARJ(32)+PM2+PM3)**2) GOTO 660
+ K(N+2,1)=1
+ KFTEMP=K(N+2,2)
+ CALL LUKFDI(KFTEMP,K(N+3,2),KFLDMP,K(N+2,2))
+ IF(K(N+2,2).EQ.0) GOTO 260
+ P(N+2,5)=ULMASS(K(N+2,2))
+ PS=P(N+1,5)+P(N+2,5)
+ PV(2,5)=P(N+2,5)
+ MMAT=0
+ ND=2
+ GOTO 490
+ ELSEIF(MMAT.EQ.44) THEN
+ MSTJ(93)=1
+ PM3=ULMASS(K(N+3,2))
+ MSTJ(93)=1
+ PM4=ULMASS(K(N+4,2))
+ IF(P(N+3,5)**2+P(N+4,5)**2+2.*FOUR(N+3,N+4).GE.
+ & (PARJ(32)+PM3+PM4)**2) GOTO 630
+ K(N+3,1)=1
+ KFTEMP=K(N+3,2)
+ CALL LUKFDI(KFTEMP,K(N+4,2),KFLDMP,K(N+3,2))
+ IF(K(N+3,2).EQ.0) GOTO 260
+ P(N+3,5)=ULMASS(K(N+3,2))
+ DO 610 J=1,3
+ P(N+3,J)=P(N+3,J)+P(N+4,J)
+ 610 CONTINUE
+ P(N+3,4)=SQRT(P(N+3,1)**2+P(N+3,2)**2+P(N+3,3)**2+P(N+3,5)**2)
+ HA=P(N+1,4)**2-P(N+2,4)**2
+ HB=HA-(P(N+1,5)**2-P(N+2,5)**2)
+ HC=(P(N+1,1)-P(N+2,1))**2+(P(N+1,2)-P(N+2,2))**2+
+ & (P(N+1,3)-P(N+2,3))**2
+ HD=(PV(1,4)-P(N+3,4))**2
+ HE=HA**2-2.*HD*(P(N+1,4)**2+P(N+2,4)**2)+HD**2
+ HF=HD*HC-HB**2
+ HG=HD*HC-HA*HB
+ HH=(SQRT(HG**2+HE*HF)-HG)/(2.*HF)
+ DO 620 J=1,3
+ PCOR=HH*(P(N+1,J)-P(N+2,J))
+ P(N+1,J)=P(N+1,J)+PCOR
+ P(N+2,J)=P(N+2,J)-PCOR
+ 620 CONTINUE
+ P(N+1,4)=SQRT(P(N+1,1)**2+P(N+1,2)**2+P(N+1,3)**2+P(N+1,5)**2)
+ P(N+2,4)=SQRT(P(N+2,1)**2+P(N+2,2)**2+P(N+2,3)**2+P(N+2,5)**2)
+ ND=ND-1
+ ENDIF
+
+C...Check invariant mass of W jets. May give one particle or start over.
+ 630 IF((MMAT.EQ.42.OR.MMAT.EQ.43.OR.MMAT.EQ.44.OR.MMAT.EQ.48)
+ &.AND.IABS(K(N+1,2)).LT.10) THEN
+ PMR=SQRT(MAX(0.D0,P(N+1,5)**2+P(N+2,5)**2+2.*FOUR(N+1,N+2)))
+ MSTJ(93)=1
+ PM1=ULMASS(K(N+1,2))
+ MSTJ(93)=1
+ PM2=ULMASS(K(N+2,2))
+ IF(PMR.GT.PARJ(32)+PM1+PM2) GOTO 640
+ KFLDUM=INT(1.5+RLU(0))
+ CALL LUKFDI(K(N+1,2),-ISIGN(KFLDUM,K(N+1,2)),KFLDMP,KF1)
+ CALL LUKFDI(K(N+2,2),-ISIGN(KFLDUM,K(N+2,2)),KFLDMP,KF2)
+ IF(KF1.EQ.0.OR.KF2.EQ.0) GOTO 260
+ PSM=ULMASS(KF1)+ULMASS(KF2)
+ IF((MMAT.EQ.42.OR.MMAT.EQ.48).AND.PMR.GT.PARJ(64)+PSM) GOTO 640
+ IF(MMAT.GE.43.AND.PMR.GT.0.2*PARJ(32)+PSM) GOTO 640
+ IF(MMAT.EQ.48) GOTO 420
+ IF(ND.EQ.4.OR.KFA.EQ.15) GOTO 260
+ K(N+1,1)=1
+ KFTEMP=K(N+1,2)
+ CALL LUKFDI(KFTEMP,K(N+2,2),KFLDMP,K(N+1,2))
+ IF(K(N+1,2).EQ.0) GOTO 260
+ P(N+1,5)=ULMASS(K(N+1,2))
+ K(N+2,2)=K(N+3,2)
+ P(N+2,5)=P(N+3,5)
+ PS=P(N+1,5)+P(N+2,5)
+ IF(PS+PARJ(64).GT.PV(1,5)) GOTO 260
+ PV(2,5)=P(N+3,5)
+ MMAT=0
+ ND=2
+ GOTO 490
+ ENDIF
+
+C...Phase space decay of partons from W decay.
+ 640 IF((MMAT.EQ.42.OR.MMAT.EQ.48).AND.IABS(K(N+1,2)).LT.10) THEN
+ KFLO(1)=K(N+1,2)
+ KFLO(2)=K(N+2,2)
+ K(N+1,1)=K(N+3,1)
+ K(N+1,2)=K(N+3,2)
+ DO 650 J=1,5
+ PV(1,J)=P(N+1,J)+P(N+2,J)
+ P(N+1,J)=P(N+3,J)
+ 650 CONTINUE
+ PV(1,5)=PMR
+ N=N+1
+ NP=0
+ NQ=2
+ PS=0.
+ MSTJ(93)=2
+ PSQ=ULMASS(KFLO(1))
+ MSTJ(93)=2
+ PSQ=PSQ+ULMASS(KFLO(2))
+ MMAT=11
+ GOTO 290
+ ENDIF
+
+C...Boost back for rapidly moving particle.
+ 660 N=N+ND
+ IF(MBST.EQ.1) THEN
+ DO 670 J=1,3
+ BE(J)=P(IP,J)/P(IP,4)
+ 670 CONTINUE
+ GA=P(IP,4)/P(IP,5)
+ DO 690 I=NSAV+1,N
+ BEP=BE(1)*P(I,1)+BE(2)*P(I,2)+BE(3)*P(I,3)
+ DO 680 J=1,3
+ P(I,J)=P(I,J)+GA*(GA*BEP/(1.+GA)+P(I,4))*BE(J)
+ 680 CONTINUE
+ P(I,4)=GA*(P(I,4)+BEP)
+ 690 CONTINUE
+ ENDIF
+
+C...Fill in position of decay vertex.
+ DO 710 I=NSAV+1,N
+ DO 700 J=1,4
+ V(I,J)=VDCY(J)
+ 700 CONTINUE
+ V(I,5)=0.
+ 710 CONTINUE
+
+C...Set up for parton shower evolution from jets.
+ IF(MSTJ(23).GE.1.AND.MMAT.EQ.4.AND.K(NSAV+1,2).EQ.21) THEN
+ K(NSAV+1,1)=3
+ K(NSAV+2,1)=3
+ K(NSAV+3,1)=3
+ K(NSAV+1,4)=MSTU(5)*(NSAV+2)
+ K(NSAV+1,5)=MSTU(5)*(NSAV+3)
+ K(NSAV+2,4)=MSTU(5)*(NSAV+3)
+ K(NSAV+2,5)=MSTU(5)*(NSAV+1)
+ K(NSAV+3,4)=MSTU(5)*(NSAV+1)
+ K(NSAV+3,5)=MSTU(5)*(NSAV+2)
+ MSTJ(92)=-(NSAV+1)
+ ELSEIF(MSTJ(23).GE.1.AND.MMAT.EQ.4) THEN
+ K(NSAV+2,1)=3
+ K(NSAV+3,1)=3
+ K(NSAV+2,4)=MSTU(5)*(NSAV+3)
+ K(NSAV+2,5)=MSTU(5)*(NSAV+3)
+ K(NSAV+3,4)=MSTU(5)*(NSAV+2)
+ K(NSAV+3,5)=MSTU(5)*(NSAV+2)
+ MSTJ(92)=NSAV+2
+ ELSEIF(MSTJ(23).GE.1.AND.(MMAT.EQ.32.OR.MMAT.EQ.44.OR.MMAT.EQ.46)
+ &.AND.IABS(K(NSAV+1,2)).LE.10.AND.IABS(K(NSAV+2,2)).LE.10) THEN
+ K(NSAV+1,1)=3
+ K(NSAV+2,1)=3
+ K(NSAV+1,4)=MSTU(5)*(NSAV+2)
+ K(NSAV+1,5)=MSTU(5)*(NSAV+2)
+ K(NSAV+2,4)=MSTU(5)*(NSAV+1)
+ K(NSAV+2,5)=MSTU(5)*(NSAV+1)
+ MSTJ(92)=NSAV+1
+ ELSEIF(MSTJ(23).GE.1.AND.(MMAT.EQ.32.OR.MMAT.EQ.44.OR.MMAT.EQ.46)
+ &.AND.IABS(K(NSAV+1,2)).LE.20.AND.IABS(K(NSAV+2,2)).LE.20) THEN
+ MSTJ(92)=NSAV+1
+ ELSEIF(MSTJ(23).GE.1.AND.MMAT.EQ.33.AND.IABS(K(NSAV+2,2)).EQ.21)
+ &THEN
+ K(NSAV+1,1)=3
+ K(NSAV+2,1)=3
+ K(NSAV+3,1)=3
+ KCP=LUCOMP(K(NSAV+1,2))
+ KQP=KCHG(KCP,2)*ISIGN(1,K(NSAV+1,2))
+ JCON=4
+ IF(KQP.LT.0) JCON=5
+ K(NSAV+1,JCON)=MSTU(5)*(NSAV+2)
+ K(NSAV+2,9-JCON)=MSTU(5)*(NSAV+1)
+ K(NSAV+2,JCON)=MSTU(5)*(NSAV+3)
+ K(NSAV+3,9-JCON)=MSTU(5)*(NSAV+2)
+ MSTJ(92)=NSAV+1
+ ELSEIF(MSTJ(23).GE.1.AND.MMAT.EQ.33) THEN
+ K(NSAV+1,1)=3
+ K(NSAV+3,1)=3
+ K(NSAV+1,4)=MSTU(5)*(NSAV+3)
+ K(NSAV+1,5)=MSTU(5)*(NSAV+3)
+ K(NSAV+3,4)=MSTU(5)*(NSAV+1)
+ K(NSAV+3,5)=MSTU(5)*(NSAV+1)
+ MSTJ(92)=NSAV+1
+
+C...Set up for parton shower evolution in t -> W + b.
+ ELSEIF(MSTJ(27).GE.1.AND.MMAT.EQ.45.AND.ND.EQ.3) THEN
+ K(NSAV+2,1)=3
+ K(NSAV+3,1)=3
+ K(NSAV+2,4)=MSTU(5)*(NSAV+3)
+ K(NSAV+2,5)=MSTU(5)*(NSAV+3)
+ K(NSAV+3,4)=MSTU(5)*(NSAV+2)
+ K(NSAV+3,5)=MSTU(5)*(NSAV+2)
+ MSTJ(92)=NSAV+1
+ ENDIF
+
+C...Mark decayed particle; special option for B-B~ mixing.
+ IF(K(IP,1).EQ.5) K(IP,1)=15
+ IF(K(IP,1).LE.10) K(IP,1)=11
+ IF(MMIX.EQ.1.AND.MSTJ(26).EQ.2.AND.K(IP,1).EQ.11) K(IP,1)=12
+ K(IP,4)=NSAV+1
+ K(IP,5)=N
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUKFDI
+ SUBROUTINE LUKFDI(KFL1,KFL2,KFL3,KF)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to generate a new flavour pair and combine off a hadron.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUDAT1/,/LUDAT2/
+
+C...Default flavour values. Input consistency checks.
+ KF1A=IABS(KFL1)
+ KF2A=IABS(KFL2)
+ KFL3=0
+ KF=0
+ IF(KF1A.EQ.0) RETURN
+ IF(KF2A.NE.0) THEN
+ IF(KF1A.LE.10.AND.KF2A.LE.10.AND.KFL1*KFL2.GT.0) RETURN
+ IF(KF1A.GT.10.AND.KF2A.GT.10) RETURN
+ IF((KF1A.GT.10.OR.KF2A.GT.10).AND.KFL1*KFL2.LT.0) RETURN
+ ENDIF
+
+C...Check if tabulated flavour probabilities are to be used.
+ IF(MSTJ(15).EQ.1) THEN
+ KTAB1=-1
+ IF(KF1A.GE.1.AND.KF1A.LE.6) KTAB1=KF1A
+ KFL1A=MOD(KF1A/1000,10)
+ KFL1B=MOD(KF1A/100,10)
+ KFL1S=MOD(KF1A,10)
+ IF(KFL1A.GE.1.AND.KFL1A.LE.4.AND.KFL1B.GE.1.AND.KFL1B.LE.4)
+ & KTAB1=6+KFL1A*(KFL1A-2)+2*KFL1B+(KFL1S-1)/2
+ IF(KFL1A.GE.1.AND.KFL1A.LE.4.AND.KFL1A.EQ.KFL1B) KTAB1=KTAB1-1
+ IF(KF1A.GE.1.AND.KF1A.LE.6) KFL1A=KF1A
+ KTAB2=0
+ IF(KF2A.NE.0) THEN
+ KTAB2=-1
+ IF(KF2A.GE.1.AND.KF2A.LE.6) KTAB2=KF2A
+ KFL2A=MOD(KF2A/1000,10)
+ KFL2B=MOD(KF2A/100,10)
+ KFL2S=MOD(KF2A,10)
+ IF(KFL2A.GE.1.AND.KFL2A.LE.4.AND.KFL2B.GE.1.AND.KFL2B.LE.4)
+ & KTAB2=6+KFL2A*(KFL2A-2)+2*KFL2B+(KFL2S-1)/2
+ IF(KFL2A.GE.1.AND.KFL2A.LE.4.AND.KFL2A.EQ.KFL2B) KTAB2=KTAB2-1
+ ENDIF
+ IF(KTAB1.GE.0.AND.KTAB2.GE.0) GOTO 150
+ ENDIF
+
+C...Parameters and breaking diquark parameter combinations.
+ 100 PAR2=PARJ(2)
+ PAR3=PARJ(3)
+ PAR4=3.*PARJ(4)
+ IF(MSTJ(12).GE.2) THEN
+ PAR3M=SQRT(PARJ(3))
+ PAR4M=1./(3.*SQRT(PARJ(4)))
+ PARDM=PARJ(7)/(PARJ(7)+PAR3M*PARJ(6))
+ PARS0=PARJ(5)*(2.+(1.+PAR2*PAR3M*PARJ(7))*(1.+PAR4M))
+ PARS1=PARJ(7)*PARS0/(2.*PAR3M)+PARJ(5)*(PARJ(6)*(1.+PAR4M)+
+ & PAR2*PAR3M*PARJ(6)*PARJ(7))
+ PARS2=PARJ(5)*2.*PARJ(6)*PARJ(7)*(PAR2*PARJ(7)+(1.+PAR4M)/PAR3M)
+ PARSM=MAX(PARS0,PARS1,PARS2)
+ PAR4=PAR4*(1.+PARSM)/(1.+PARSM/(3.*PAR4M))
+ ENDIF
+
+C...Choice of whether to generate meson or baryon.
+ 110 MBARY=0
+ KFDA=0
+ IF(KF1A.LE.10) THEN
+ IF(KF2A.EQ.0.AND.MSTJ(12).GE.1.AND.(1.+PARJ(1))*RLU(0).GT.1.)
+ & MBARY=1
+ IF(KF2A.GT.10) MBARY=2
+ IF(KF2A.GT.10.AND.KF2A.LE.10000) KFDA=KF2A
+ ELSE
+ MBARY=2
+ IF(KF1A.LE.10000) KFDA=KF1A
+ ENDIF
+
+C...Possibility of process diquark -> meson + new diquark.
+ IF(KFDA.NE.0.AND.MSTJ(12).GE.2) THEN
+ KFLDA=MOD(KFDA/1000,10)
+ KFLDB=MOD(KFDA/100,10)
+ KFLDS=MOD(KFDA,10)
+ WTDQ=PARS0
+ IF(MAX(KFLDA,KFLDB).EQ.3) WTDQ=PARS1
+ IF(MIN(KFLDA,KFLDB).EQ.3) WTDQ=PARS2
+ IF(KFLDS.EQ.1) WTDQ=WTDQ/(3.*PAR4M)
+ IF((1.+WTDQ)*RLU(0).GT.1.) MBARY=-1
+ IF(MBARY.EQ.-1.AND.KF2A.NE.0) RETURN
+ ENDIF
+
+C...Flavour for meson, possibly with new flavour.
+ IF(MBARY.LE.0) THEN
+ KFS=ISIGN(1,KFL1)
+ IF(MBARY.EQ.0) THEN
+ IF(KF2A.EQ.0) KFL3=ISIGN(1+INT((2.+PAR2)*RLU(0)),-KFL1)
+ KFLA=MAX(KF1A,KF2A+IABS(KFL3))
+ KFLB=MIN(KF1A,KF2A+IABS(KFL3))
+ IF(KFLA.NE.KF1A) KFS=-KFS
+
+C...Splitting of diquark into meson plus new diquark.
+ ELSE
+ KFL1A=MOD(KF1A/1000,10)
+ KFL1B=MOD(KF1A/100,10)
+ 120 KFL1D=KFL1A+INT(RLU(0)+0.5)*(KFL1B-KFL1A)
+ KFL1E=KFL1A+KFL1B-KFL1D
+ IF((KFL1D.EQ.3.AND.RLU(0).GT.PARDM).OR.(KFL1E.EQ.3.AND.
+ & RLU(0).LT.PARDM)) THEN
+ KFL1D=KFL1A+KFL1B-KFL1D
+ KFL1E=KFL1A+KFL1B-KFL1E
+ ENDIF
+ KFL3A=1+INT((2.+PAR2*PAR3M*PARJ(7))*RLU(0))
+ IF
+ & ((KFL1E.NE.KFL3A.AND.RLU(0).GT.(1.+PAR4M)/MAX(2.D0,1.+PAR4M))
+ & .OR.(KFL1E.EQ.KFL3A.AND.RLU(0).GT.2./MAX(2.D0,1.+PAR4M)))
+ & GOTO 120
+ KFLDS=3
+ IF(KFL1E.NE.KFL3A) KFLDS=2*INT(RLU(0)+1./(1.+PAR4M))+1
+ KFL3=ISIGN(10000+1000*MAX(KFL1E,KFL3A)+100*MIN(KFL1E,KFL3A)+
+ & KFLDS,-KFL1)
+ KFLA=MAX(KFL1D,KFL3A)
+ KFLB=MIN(KFL1D,KFL3A)
+ IF(KFLA.NE.KFL1D) KFS=-KFS
+ ENDIF
+
+C...Form meson, with spin and flavour mixing for diagonal states.
+ IF(KFLA.LE.2) KMUL=INT(PARJ(11)+RLU(0))
+ IF(KFLA.EQ.3) KMUL=INT(PARJ(12)+RLU(0))
+ IF(KFLA.GE.4) KMUL=INT(PARJ(13)+RLU(0))
+ IF(KMUL.EQ.0.AND.PARJ(14).GT.0.) THEN
+ IF(RLU(0).LT.PARJ(14)) KMUL=2
+ ELSEIF(KMUL.EQ.1.AND.PARJ(15)+PARJ(16)+PARJ(17).GT.0.) THEN
+ RMUL=RLU(0)
+ IF(RMUL.LT.PARJ(15)) KMUL=3
+ IF(KMUL.EQ.1.AND.RMUL.LT.PARJ(15)+PARJ(16)) KMUL=4
+ IF(KMUL.EQ.1.AND.RMUL.LT.PARJ(15)+PARJ(16)+PARJ(17)) KMUL=5
+ ENDIF
+ KFLS=3
+ IF(KMUL.EQ.0.OR.KMUL.EQ.3) KFLS=1
+ IF(KMUL.EQ.5) KFLS=5
+ IF(KFLA.NE.KFLB) THEN
+ KF=(100*KFLA+10*KFLB+KFLS)*KFS*(-1)**KFLA
+ ELSE
+ RMIX=RLU(0)
+ IMIX=2*KFLA+10*KMUL
+ IF(KFLA.LE.3) KF=110*(1+INT(RMIX+PARF(IMIX-1))+
+ & INT(RMIX+PARF(IMIX)))+KFLS
+ IF(KFLA.GE.4) KF=110*KFLA+KFLS
+ ENDIF
+ IF(KMUL.EQ.2.OR.KMUL.EQ.3) KF=KF+ISIGN(10000,KF)
+ IF(KMUL.EQ.4) KF=KF+ISIGN(20000,KF)
+
+C...Optional extra suppression of eta and eta'.
+ IF(KF.EQ.221) THEN
+ IF(RLU(0).GT.PARJ(25)) GOTO 110
+ ELSEIF(KF.EQ.331) THEN
+ IF(RLU(0).GT.PARJ(26)) GOTO 110
+ ENDIF
+
+C...Generate diquark flavour.
+ ELSE
+ 130 IF(KF1A.LE.10.AND.KF2A.EQ.0) THEN
+ KFLA=KF1A
+ 140 KFLB=1+INT((2.+PAR2*PAR3)*RLU(0))
+ KFLC=1+INT((2.+PAR2*PAR3)*RLU(0))
+ KFLDS=1
+ IF(KFLB.GE.KFLC) KFLDS=3
+ IF(KFLDS.EQ.1.AND.PAR4*RLU(0).GT.1.) GOTO 140
+ IF(KFLDS.EQ.3.AND.PAR4.LT.RLU(0)) GOTO 140
+ KFL3=ISIGN(1000*MAX(KFLB,KFLC)+100*MIN(KFLB,KFLC)+KFLDS,KFL1)
+
+C...Take diquark flavour from input.
+ ELSEIF(KF1A.LE.10) THEN
+ KFLA=KF1A
+ KFLB=MOD(KF2A/1000,10)
+ KFLC=MOD(KF2A/100,10)
+ KFLDS=MOD(KF2A,10)
+
+C...Generate (or take from input) quark to go with diquark.
+ ELSE
+ IF(KF2A.EQ.0) KFL3=ISIGN(1+INT((2.+PAR2)*RLU(0)),KFL1)
+ KFLA=KF2A+IABS(KFL3)
+ KFLB=MOD(KF1A/1000,10)
+ KFLC=MOD(KF1A/100,10)
+ KFLDS=MOD(KF1A,10)
+ ENDIF
+
+C...SU(6) factors for formation of baryon. Try again if fails.
+ KBARY=KFLDS
+ IF(KFLDS.EQ.3.AND.KFLB.NE.KFLC) KBARY=5
+ IF(KFLA.NE.KFLB.AND.KFLA.NE.KFLC) KBARY=KBARY+1
+ WT=PARF(60+KBARY)+PARJ(18)*PARF(70+KBARY)
+ IF(MBARY.EQ.1.AND.MSTJ(12).GE.2) THEN
+ WTDQ=PARS0
+ IF(MAX(KFLB,KFLC).EQ.3) WTDQ=PARS1
+ IF(MIN(KFLB,KFLC).EQ.3) WTDQ=PARS2
+ IF(KFLDS.EQ.1) WTDQ=WTDQ/(3.*PAR4M)
+ IF(KFLDS.EQ.1) WT=WT*(1.+WTDQ)/(1.+PARSM/(3.*PAR4M))
+ IF(KFLDS.EQ.3) WT=WT*(1.+WTDQ)/(1.+PARSM)
+ ENDIF
+ IF(KF2A.EQ.0.AND.WT.LT.RLU(0)) GOTO 130
+
+C...Form baryon. Distinguish Lambda- and Sigmalike baryons.
+ KFLD=MAX(KFLA,KFLB,KFLC)
+ KFLF=MIN(KFLA,KFLB,KFLC)
+ KFLE=KFLA+KFLB+KFLC-KFLD-KFLF
+ KFLS=2
+ IF((PARF(60+KBARY)+PARJ(18)*PARF(70+KBARY))*RLU(0).GT.
+ & PARF(60+KBARY)) KFLS=4
+ KFLL=0
+ IF(KFLS.EQ.2.AND.KFLD.GT.KFLE.AND.KFLE.GT.KFLF) THEN
+ IF(KFLDS.EQ.1.AND.KFLA.EQ.KFLD) KFLL=1
+ IF(KFLDS.EQ.1.AND.KFLA.NE.KFLD) KFLL=INT(0.25+RLU(0))
+ IF(KFLDS.EQ.3.AND.KFLA.NE.KFLD) KFLL=INT(0.75+RLU(0))
+ ENDIF
+ IF(KFLL.EQ.0) KF=ISIGN(1000*KFLD+100*KFLE+10*KFLF+KFLS,KFL1)
+ IF(KFLL.EQ.1) KF=ISIGN(1000*KFLD+100*KFLF+10*KFLE+KFLS,KFL1)
+ ENDIF
+ RETURN
+
+C...Use tabulated probabilities to select new flavour and hadron.
+ 150 IF(KTAB2.EQ.0.AND.MSTJ(12).LE.0) THEN
+ KT3L=1
+ KT3U=6
+ ELSEIF(KTAB2.EQ.0.AND.KTAB1.GE.7.AND.MSTJ(12).LE.1) THEN
+ KT3L=1
+ KT3U=6
+ ELSEIF(KTAB2.EQ.0) THEN
+ KT3L=1
+ KT3U=22
+ ELSE
+ KT3L=KTAB2
+ KT3U=KTAB2
+ ENDIF
+ RFL=0.
+ DO 170 KTS=0,2
+ DO 160 KT3=KT3L,KT3U
+ RFL=RFL+PARF(120+80*KTAB1+25*KTS+KT3)
+ 160 CONTINUE
+ 170 CONTINUE
+ RFL=RLU(0)*RFL
+ DO 190 KTS=0,2
+ KTABS=KTS
+ DO 180 KT3=KT3L,KT3U
+ KTAB3=KT3
+ RFL=RFL-PARF(120+80*KTAB1+25*KTS+KT3)
+ IF(RFL.LE.0.) GOTO 200
+ 180 CONTINUE
+ 190 CONTINUE
+ 200 CONTINUE
+
+C...Reconstruct flavour of produced quark/diquark.
+ IF(KTAB3.LE.6) THEN
+ KFL3A=KTAB3
+ KFL3B=0
+ KFL3=ISIGN(KFL3A,KFL1*(2*KTAB1-13))
+ ELSE
+ KFL3A=1
+ IF(KTAB3.GE.8) KFL3A=2
+ IF(KTAB3.GE.11) KFL3A=3
+ IF(KTAB3.GE.16) KFL3A=4
+ KFL3B=(KTAB3-6-KFL3A*(KFL3A-2))/2
+ KFL3=1000*KFL3A+100*KFL3B+1
+ IF(KFL3A.EQ.KFL3B.OR.KTAB3.NE.6+KFL3A*(KFL3A-2)+2*KFL3B) KFL3=
+ & KFL3+2
+ KFL3=ISIGN(KFL3,KFL1*(13-2*KTAB1))
+ ENDIF
+
+C...Reconstruct meson code.
+ IF(KFL3A.EQ.KFL1A.AND.KFL3B.EQ.KFL1B.AND.(KFL3A.LE.3.OR.
+ &KFL3B.NE.0)) THEN
+ RFL=RLU(0)*(PARF(143+80*KTAB1+25*KTABS)+PARF(144+80*KTAB1+
+ & 25*KTABS)+PARF(145+80*KTAB1+25*KTABS))
+ KF=110+2*KTABS+1
+ IF(RFL.GT.PARF(143+80*KTAB1+25*KTABS)) KF=220+2*KTABS+1
+ IF(RFL.GT.PARF(143+80*KTAB1+25*KTABS)+PARF(144+80*KTAB1+
+ & 25*KTABS)) KF=330+2*KTABS+1
+ ELSEIF(KTAB1.LE.6.AND.KTAB3.LE.6) THEN
+ KFLA=MAX(KTAB1,KTAB3)
+ KFLB=MIN(KTAB1,KTAB3)
+ KFS=ISIGN(1,KFL1)
+ IF(KFLA.NE.KF1A) KFS=-KFS
+ KF=(100*KFLA+10*KFLB+2*KTABS+1)*KFS*(-1)**KFLA
+ ELSEIF(KTAB1.GE.7.AND.KTAB3.GE.7) THEN
+ KFS=ISIGN(1,KFL1)
+ IF(KFL1A.EQ.KFL3A) THEN
+ KFLA=MAX(KFL1B,KFL3B)
+ KFLB=MIN(KFL1B,KFL3B)
+ IF(KFLA.NE.KFL1B) KFS=-KFS
+ ELSEIF(KFL1A.EQ.KFL3B) THEN
+ KFLA=KFL3A
+ KFLB=KFL1B
+ KFS=-KFS
+ ELSEIF(KFL1B.EQ.KFL3A) THEN
+ KFLA=KFL1A
+ KFLB=KFL3B
+ ELSEIF(KFL1B.EQ.KFL3B) THEN
+ KFLA=MAX(KFL1A,KFL3A)
+ KFLB=MIN(KFL1A,KFL3A)
+ IF(KFLA.NE.KFL1A) KFS=-KFS
+ ELSE
+ CALL LUERRM(2,'(LUKFDI:) no matching flavours for qq -> qq')
+ GOTO 100
+ ENDIF
+ KF=(100*KFLA+10*KFLB+2*KTABS+1)*KFS*(-1)**KFLA
+
+C...Reconstruct baryon code.
+ ELSE
+ IF(KTAB1.GE.7) THEN
+ KFLA=KFL3A
+ KFLB=KFL1A
+ KFLC=KFL1B
+ ELSE
+ KFLA=KFL1A
+ KFLB=KFL3A
+ KFLC=KFL3B
+ ENDIF
+ KFLD=MAX(KFLA,KFLB,KFLC)
+ KFLF=MIN(KFLA,KFLB,KFLC)
+ KFLE=KFLA+KFLB+KFLC-KFLD-KFLF
+ IF(KTABS.EQ.0) KF=ISIGN(1000*KFLD+100*KFLF+10*KFLE+2,KFL1)
+ IF(KTABS.GE.1) KF=ISIGN(1000*KFLD+100*KFLE+10*KFLF+2*KTABS,KFL1)
+ ENDIF
+
+C...Check that constructed flavour code is an allowed one.
+ IF(KFL2.NE.0) KFL3=0
+ KC=LUCOMP(KF)
+ IF(KC.EQ.0) THEN
+ CALL LUERRM(2,'(LUKFDI:) user-defined flavour probabilities '//
+ & 'failed')
+ GOTO 100
+ ENDIF
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUPTDI
+ SUBROUTINE LUPTDI(KFL,PX,PY)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to generate transverse momentum according to a Gaussian.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ SAVE /LUDAT1/
+
+C...Generate p_T and azimuthal angle, gives p_x and p_y.
+ KFLA=IABS(KFL)
+ PT=PARJ(21)*SQRT(-LOG(MAX(1D-10,RLU(0))))
+ IF(PARJ(23).GT.RLU(0)) PT=PARJ(24)*PT
+ IF(MSTJ(91).EQ.1) PT=PARJ(22)*PT
+ IF(KFLA.EQ.0.AND.MSTJ(13).LE.0) PT=0.
+ PHI=PARU(2)*RLU(0)
+ PX=PT*COS(PHI)
+ PY=PT*SIN(PHI)
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUZDIS
+ SUBROUTINE LUZDIS(KFL1,KFL2,PR,Z)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to generate the longitudinal splitting variable z.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUDAT1/,/LUDAT2/
+
+C...Check if heavy flavour fragmentation.
+ KFLA=IABS(KFL1)
+ KFLB=IABS(KFL2)
+ KFLH=KFLA
+ IF(KFLA.GE.10) KFLH=MOD(KFLA/1000,10)
+
+C...Lund symmetric scaling function: determine parameters of shape.
+ IF(MSTJ(11).EQ.1.OR.(MSTJ(11).EQ.3.AND.KFLH.LE.3).OR.
+ &MSTJ(11).GE.4) THEN
+ FA=PARJ(41)
+ IF(MSTJ(91).EQ.1) FA=PARJ(43)
+ IF(KFLB.GE.10) FA=FA+PARJ(45)
+ FBB=PARJ(42)
+ IF(MSTJ(91).EQ.1) FBB=PARJ(44)
+ FB=FBB*PR
+ FC=1.
+ IF(KFLA.GE.10) FC=FC-PARJ(45)
+ IF(KFLB.GE.10) FC=FC+PARJ(45)
+ IF(MSTJ(11).GE.4.AND.KFLH.GE.4.AND.KFLH.LE.5) THEN
+ FRED=PARJ(46)
+ IF(MSTJ(11).EQ.5.AND.KFLH.EQ.5) FRED=PARJ(47)
+ FC=FC+FRED*FBB*PARF(100+KFLH)**2
+ ELSEIF(MSTJ(11).GE.4.AND.KFLH.GE.6.AND.KFLH.LE.8) THEN
+ FRED=PARJ(46)
+ IF(MSTJ(11).EQ.5) FRED=PARJ(48)
+ FC=FC+FRED*FBB*PMAS(KFLH,1)**2
+ ENDIF
+ MC=1
+ IF(ABS(FC-1.).GT.0.01) MC=2
+
+C...Determine position of maximum. Special cases for a = 0 or a = c.
+ IF(FA.LT.0.02) THEN
+ MA=1
+ ZMAX=1.
+ IF(FC.GT.FB) ZMAX=FB/FC
+ ELSEIF(ABS(FC-FA).LT.0.01) THEN
+ MA=2
+ ZMAX=FB/(FB+FC)
+ ELSE
+ MA=3
+ ZMAX=0.5*(FB+FC-SQRT((FB-FC)**2+4.*FA*FB))/(FC-FA)
+ IF(ZMAX.GT.0.9999.AND.FB.GT.100.) ZMAX=MIN(ZMAX,1.-FA/FB)
+ ENDIF
+
+C...Subdivide z range if distribution very peaked near endpoint.
+ MMAX=2
+ IF(ZMAX.LT.0.1) THEN
+ MMAX=1
+ ZDIV=2.75*ZMAX
+ IF(MC.EQ.1) THEN
+ FINT=1.-LOG(ZDIV)
+ ELSE
+ ZDIVC=ZDIV**(1.-FC)
+ FINT=1.+(1.-1./ZDIVC)/(FC-1.)
+ ENDIF
+ ELSEIF(ZMAX.GT.0.85.AND.FB.GT.1.) THEN
+ MMAX=3
+ FSCB=SQRT(4.+(FC/FB)**2)
+ ZDIV=FSCB-1./ZMAX-(FC/FB)*LOG(ZMAX*0.5*(FSCB+FC/FB))
+ IF(MA.GE.2) ZDIV=ZDIV+(FA/FB)*LOG(1.-ZMAX)
+ ZDIV=MIN(ZMAX,MAX(0.D0,ZDIV))
+ FINT=1.+FB*(1.-ZDIV)
+ ENDIF
+
+C...Choice of z, preweighted for peaks at low or high z.
+ 100 Z=RLU(0)
+ FPRE=1.
+ IF(MMAX.EQ.1) THEN
+ IF(FINT*RLU(0).LE.1.) THEN
+ Z=ZDIV*Z
+ ELSEIF(MC.EQ.1) THEN
+ Z=ZDIV**Z
+ FPRE=ZDIV/Z
+ ELSE
+ Z=1./(ZDIVC+Z*(1.-ZDIVC))**(1./(1.-FC))
+ FPRE=(ZDIV/Z)**FC
+ ENDIF
+ ELSEIF(MMAX.EQ.3) THEN
+ IF(FINT*RLU(0).LE.1.) THEN
+ Z=ZDIV+LOG(Z)/FB
+ FPRE=EXP(FB*(Z-ZDIV))
+ ELSE
+ Z=ZDIV+Z*(1.-ZDIV)
+ ENDIF
+ ENDIF
+
+C...Weighting according to correct formula.
+ IF(Z.LE.0..OR.Z.GE.1.) GOTO 100
+ FEXP=FC*LOG(ZMAX/Z)+FB*(1./ZMAX-1./Z)
+ IF(MA.GE.2) FEXP=FEXP+FA*LOG((1.-Z)/(1.-ZMAX))
+ FVAL=EXP(MAX(-50.D0,MIN(50.D0,FEXP)))
+ IF(FVAL.LT.RLU(0)*FPRE) GOTO 100
+
+C...Generate z according to Field-Feynman, SLAC, (1-z)**c OR z**c.
+ ELSE
+ FC=PARJ(50+MAX(1,KFLH))
+ IF(MSTJ(91).EQ.1) FC=PARJ(59)
+ 110 Z=RLU(0)
+ IF(FC.GE.0..AND.FC.LE.1.) THEN
+ IF(FC.GT.RLU(0)) Z=1.-Z**(1./3.)
+ ELSEIF(FC.GT.-1.AND.FC.LT.0.) THEN
+ IF(-4.*FC*Z*(1.-Z)**2.LT.RLU(0)*((1.-Z)**2-FC*Z)**2) GOTO 110
+ ELSE
+ IF(FC.GT.0.) Z=1.-Z**(1./FC)
+ IF(FC.LT.0.) Z=Z**(-1./FC)
+ ENDIF
+ ENDIF
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUSHOW
+ SUBROUTINE LUSHOW(IP1,IP2,QMAX)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to generate timelike parton showers from given partons.
+C IMPLICIT DOUBLE PRECISION(D)
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+ DIMENSION PMTH(5,50),PS(5),PMA(4),PMSD(4),IEP(4),IPA(4),
+ &KFLA(4),KFLD(4),KFL(4),ITRY(4),ISI(4),ISL(4),DP(4),DPT(5,4),
+ &KSH(0:40),KCII(2),NIIS(2),IIIS(2,2),THEIIS(2,2),PHIIIS(2,2),
+ &ISII(2)
+
+C...Initialization of cutoff masses etc.
+ IF(MSTJ(41).LE.0.OR.(MSTJ(41).EQ.1.AND.QMAX.LE.PARJ(82)).OR.
+ &QMAX.LE.MIN(PARJ(82),PARJ(83))) RETURN
+ DO 100 IFL=0,40
+ KSH(IFL)=0
+ 100 CONTINUE
+ KSH(21)=1
+ PMTH(1,21)=ULMASS(21)
+ PMTH(2,21)=SQRT(PMTH(1,21)**2+0.25*PARJ(82)**2)
+ PMTH(3,21)=2.*PMTH(2,21)
+ PMTH(4,21)=PMTH(3,21)
+ PMTH(5,21)=PMTH(3,21)
+ PMTH(1,22)=ULMASS(22)
+ PMTH(2,22)=SQRT(PMTH(1,22)**2+0.25*PARJ(83)**2)
+ PMTH(3,22)=2.*PMTH(2,22)
+ PMTH(4,22)=PMTH(3,22)
+ PMTH(5,22)=PMTH(3,22)
+ PMQTH1=PARJ(82)
+ IF(MSTJ(41).GE.2) PMQTH1=MIN(PARJ(82),PARJ(83))
+ PMQTH2=PMTH(2,21)
+ IF(MSTJ(41).GE.2) PMQTH2=MIN(PMTH(2,21),PMTH(2,22))
+ DO 110 IFL=1,8
+ KSH(IFL)=1
+ PMTH(1,IFL)=ULMASS(IFL)
+ PMTH(2,IFL)=SQRT(PMTH(1,IFL)**2+0.25*PMQTH1**2)
+ PMTH(3,IFL)=PMTH(2,IFL)+PMQTH2
+ PMTH(4,IFL)=SQRT(PMTH(1,IFL)**2+0.25*PARJ(82)**2)+PMTH(2,21)
+ PMTH(5,IFL)=SQRT(PMTH(1,IFL)**2+0.25*PARJ(83)**2)+PMTH(2,22)
+ 110 CONTINUE
+ DO 120 IFL=11,17,2
+ IF(MSTJ(41).GE.2) KSH(IFL)=1
+ PMTH(1,IFL)=ULMASS(IFL)
+ PMTH(2,IFL)=SQRT(PMTH(1,IFL)**2+0.25*PARJ(83)**2)
+ PMTH(3,IFL)=PMTH(2,IFL)+PMTH(2,22)
+ PMTH(4,IFL)=PMTH(3,IFL)
+ PMTH(5,IFL)=PMTH(3,IFL)
+ 120 CONTINUE
+ PT2MIN=MAX(0.5*PARJ(82),1.1*PARJ(81))**2
+ ALAMS=PARJ(81)**2
+ ALFM=LOG(PT2MIN/ALAMS)
+
+C...Store positions of shower initiating partons.
+ IF(IP1.GT.0.AND.IP1.LE.MIN(N,MSTU(4)-MSTU(32)).AND.IP2.EQ.0) THEN
+ NPA=1
+ IPA(1)=IP1
+ ELSEIF(MIN(IP1,IP2).GT.0.AND.MAX(IP1,IP2).LE.MIN(N,MSTU(4)-
+ &MSTU(32))) THEN
+ NPA=2
+ IPA(1)=IP1
+ IPA(2)=IP2
+ ELSEIF(IP1.GT.0.AND.IP1.LE.MIN(N,MSTU(4)-MSTU(32)).AND.IP2.LT.0
+ &.AND.IP2.GE.-3) THEN
+ NPA=IABS(IP2)
+ DO 130 I=1,NPA
+ IPA(I)=IP1+I-1
+ 130 CONTINUE
+ ELSE
+ CALL LUERRM(12,
+ & '(LUSHOW:) failed to reconstruct showering system')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+
+C...Check on phase space available for emission.
+ IREJ=0
+ DO 140 J=1,5
+ PS(J)=0.
+ 140 CONTINUE
+ PM=0.
+ DO 160 I=1,NPA
+ KFLA(I)=IABS(K(IPA(I),2))
+ PMA(I)=P(IPA(I),5)
+C...Special cutoff masses for t, l, h with variable masses.
+ IFLA=KFLA(I)
+ IF(KFLA(I).GE.6.AND.KFLA(I).LE.8) THEN
+ IFLA=37+KFLA(I)+ISIGN(2,K(IPA(I),2))
+ PMTH(1,IFLA)=PMA(I)
+ PMTH(2,IFLA)=SQRT(PMTH(1,IFLA)**2+0.25*PMQTH1**2)
+ PMTH(3,IFLA)=PMTH(2,IFLA)+PMQTH2
+ PMTH(4,IFLA)=SQRT(PMTH(1,IFLA)**2+0.25*PARJ(82)**2)+PMTH(2,21)
+ PMTH(5,IFLA)=SQRT(PMTH(1,IFLA)**2+0.25*PARJ(83)**2)+PMTH(2,22)
+ ENDIF
+ IF(KFLA(I).LE.40) THEN
+ IF(KSH(KFLA(I)).EQ.1) PMA(I)=PMTH(3,IFLA)
+ ENDIF
+ PM=PM+PMA(I)
+ IF(KFLA(I).GT.40) THEN
+ IREJ=IREJ+1
+ ELSE
+ IF(KSH(KFLA(I)).EQ.0.OR.PMA(I).GT.QMAX) IREJ=IREJ+1
+ ENDIF
+ DO 150 J=1,4
+ PS(J)=PS(J)+P(IPA(I),J)
+ 150 CONTINUE
+ 160 CONTINUE
+ IF(IREJ.EQ.NPA) RETURN
+ PS(5)=SQRT(MAX(0.D0,PS(4)**2-PS(1)**2-PS(2)**2-PS(3)**2))
+ IF(NPA.EQ.1) PS(5)=PS(4)
+ IF(PS(5).LE.PM+PMQTH1) RETURN
+
+C...Check if 3-jet matrix elements to be used.
+ M3JC=0
+ IF(NPA.EQ.2.AND.MSTJ(47).GE.1) THEN
+ IF(KFLA(1).GE.1.AND.KFLA(1).LE.8.AND.KFLA(2).GE.1.AND.
+ & KFLA(2).LE.8) M3JC=1
+ IF((KFLA(1).EQ.11.OR.KFLA(1).EQ.13.OR.KFLA(1).EQ.15.OR.
+ & KFLA(1).EQ.17).AND.KFLA(2).EQ.KFLA(1)) M3JC=1
+ IF((KFLA(1).EQ.11.OR.KFLA(1).EQ.13.OR.KFLA(1).EQ.15.OR.
+ & KFLA(1).EQ.17).AND.KFLA(2).EQ.KFLA(1)+1) M3JC=1
+ IF((KFLA(1).EQ.12.OR.KFLA(1).EQ.14.OR.KFLA(1).EQ.16.OR.
+ & KFLA(1).EQ.18).AND.KFLA(2).EQ.KFLA(1)-1) M3JC=1
+ IF(MSTJ(47).EQ.2.OR.MSTJ(47).EQ.4) M3JC=1
+ M3JCM=0
+ IF(M3JC.EQ.1.AND.MSTJ(47).GE.3.AND.KFLA(1).EQ.KFLA(2)) THEN
+ M3JCM=1
+ QME=(2.*PMTH(1,KFLA(1))/PS(5))**2
+ ENDIF
+ ENDIF
+
+C...Find if interference with initial state partons.
+ MIIS=0
+ IF(MSTJ(50).GE.1.AND.MSTJ(50).LE.3.AND.NPA.EQ.2) MIIS=MSTJ(50)
+ IF(MIIS.NE.0) THEN
+ DO 180 I=1,2
+ KCII(I)=0
+ KCA=LUCOMP(KFLA(I))
+ IF(KCA.NE.0) KCII(I)=KCHG(KCA,2)*ISIGN(1,K(IPA(I),2))
+ NIIS(I)=0
+ IF(KCII(I).NE.0) THEN
+ DO 170 J=1,2
+ ICSI=MOD(K(IPA(I),3+J)/MSTU(5),MSTU(5))
+ IF(ICSI.GT.0.AND.ICSI.NE.IPA(1).AND.ICSI.NE.IPA(2).AND.
+ & (KCII(I).EQ.(-1)**(J+1).OR.KCII(I).EQ.2)) THEN
+ NIIS(I)=NIIS(I)+1
+ IIIS(I,NIIS(I))=ICSI
+ ENDIF
+ 170 CONTINUE
+ ENDIF
+ 180 CONTINUE
+ IF(NIIS(1)+NIIS(2).EQ.0) MIIS=0
+ ENDIF
+
+C...Boost interfering initial partons to rest frame
+C...and reconstruct their polar and azimuthal angles.
+ IF(MIIS.NE.0) THEN
+ DO 200 I=1,2
+ DO 190 J=1,5
+ K(N+I,J)=K(IPA(I),J)
+ P(N+I,J)=P(IPA(I),J)
+ V(N+I,J)=0.
+ 190 CONTINUE
+ 200 CONTINUE
+ DO 220 I=3,2+NIIS(1)
+ DO 210 J=1,5
+ K(N+I,J)=K(IIIS(1,I-2),J)
+ P(N+I,J)=P(IIIS(1,I-2),J)
+ V(N+I,J)=0.
+ 210 CONTINUE
+ 220 CONTINUE
+ DO 240 I=3+NIIS(1),2+NIIS(1)+NIIS(2)
+ DO 230 J=1,5
+ K(N+I,J)=K(IIIS(2,I-2-NIIS(1)),J)
+ P(N+I,J)=P(IIIS(2,I-2-NIIS(1)),J)
+ V(N+I,J)=0.
+ 230 CONTINUE
+ 240 CONTINUE
+ CALL
+ & LUDBRB(N+1,N+2+NIIS(1)+NIIS(2),0.D0,0.D0,-DBLE(PS(1)/PS(4)),
+ & -DBLE(PS(2)/PS(4)),-DBLE(PS(3)/PS(4)))
+ PHI=ULANGL(P(N+1,1),P(N+1,2))
+ CALL LUDBRB(N+1,N+2+NIIS(1)+NIIS(2),0.D0,-PHI,0D0,0D0,0D0)
+ THE=ULANGL(P(N+1,3),P(N+1,1))
+ CALL LUDBRB(N+1,N+2+NIIS(1)+NIIS(2),-THE,0.D0,0D0,0D0,0D0)
+ DO 250 I=3,2+NIIS(1)
+ THEIIS(1,I-2)=ULANGL(P(N+I,3),SQRT(P(N+I,1)**2+P(N+I,2)**2))
+ PHIIIS(1,I-2)=ULANGL(P(N+I,1),P(N+I,2))
+ 250 CONTINUE
+ DO 260 I=3+NIIS(1),2+NIIS(1)+NIIS(2)
+ THEIIS(2,I-2-NIIS(1))=PARU(1)-ULANGL(P(N+I,3),
+ & SQRT(P(N+I,1)**2+P(N+I,2)**2))
+ PHIIIS(2,I-2-NIIS(1))=ULANGL(P(N+I,1),P(N+I,2))
+ 260 CONTINUE
+ ENDIF
+
+C...Define imagined single initiator of shower for parton system.
+ NS=N
+ IF(N.GT.MSTU(4)-MSTU(32)-5) THEN
+ CALL LUERRM(11,'(LUSHOW:) no more memory left in LUJETS')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ IF(NPA.GE.2) THEN
+ K(N+1,1)=11
+ K(N+1,2)=21
+ K(N+1,3)=0
+ K(N+1,4)=0
+ K(N+1,5)=0
+ P(N+1,1)=0.
+ P(N+1,2)=0.
+ P(N+1,3)=0.
+ P(N+1,4)=PS(5)
+ P(N+1,5)=PS(5)
+ V(N+1,5)=PS(5)**2
+ N=N+1
+ ENDIF
+
+C...Loop over partons that may branch.
+ NEP=NPA
+ IM=NS
+ IF(NPA.EQ.1) IM=NS-1
+ 270 IM=IM+1
+ IF(N.GT.NS) THEN
+ IF(IM.GT.N) GOTO 510
+ KFLM=IABS(K(IM,2))
+ IF(KFLM.GT.40) GOTO 270
+ IF(KSH(KFLM).EQ.0) GOTO 270
+ IFLM=KFLM
+ IF(KFLM.GE.6.AND.KFLM.LE.8) IFLM=37+KFLM+ISIGN(2,K(IM,2))
+ IF(P(IM,5).LT.PMTH(2,IFLM)) GOTO 270
+ IGM=K(IM,3)
+ ELSE
+ IGM=-1
+ ENDIF
+ IF(N+NEP.GT.MSTU(4)-MSTU(32)-5) THEN
+ CALL LUERRM(11,'(LUSHOW:) no more memory left in LUJETS')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+
+C...Position of aunt (sister to branching parton).
+C...Origin and flavour of daughters.
+ IAU=0
+ IF(IGM.GT.0) THEN
+ IF(K(IM-1,3).EQ.IGM) IAU=IM-1
+ IF(N.GE.IM+1.AND.K(IM+1,3).EQ.IGM) IAU=IM+1
+ ENDIF
+ IF(IGM.GE.0) THEN
+ K(IM,4)=N+1
+ DO 280 I=1,NEP
+ K(N+I,3)=IM
+ 280 CONTINUE
+ ELSE
+ K(N+1,3)=IPA(1)
+ ENDIF
+ IF(IGM.LE.0) THEN
+ DO 290 I=1,NEP
+ K(N+I,2)=K(IPA(I),2)
+ 290 CONTINUE
+ ELSEIF(KFLM.NE.21) THEN
+ K(N+1,2)=K(IM,2)
+ K(N+2,2)=K(IM,5)
+ ELSEIF(K(IM,5).EQ.21) THEN
+ K(N+1,2)=21
+ K(N+2,2)=21
+ ELSE
+ K(N+1,2)=K(IM,5)
+ K(N+2,2)=-K(IM,5)
+ ENDIF
+
+C...Reset flags on daughers and tries made.
+ DO 300 IP=1,NEP
+ K(N+IP,1)=3
+ K(N+IP,4)=0
+ K(N+IP,5)=0
+ KFLD(IP)=IABS(K(N+IP,2))
+ IF(KCHG(LUCOMP(KFLD(IP)),2).EQ.0) K(N+IP,1)=1
+ ITRY(IP)=0
+ ISL(IP)=0
+ ISI(IP)=0
+ IF(KFLD(IP).LE.40) THEN
+ IF(KSH(KFLD(IP)).EQ.1) ISI(IP)=1
+ ENDIF
+ 300 CONTINUE
+ ISLM=0
+
+C...Maximum virtuality of daughters.
+ IF(IGM.LE.0) THEN
+ DO 310 I=1,NPA
+ IF(NPA.GE.3) P(N+I,4)=(PS(4)*P(IPA(I),4)-PS(1)*P(IPA(I),1)-
+ & PS(2)*P(IPA(I),2)-PS(3)*P(IPA(I),3))/PS(5)
+ P(N+I,5)=MIN(QMAX,PS(5))
+ IF(NPA.GE.3) P(N+I,5)=MIN(P(N+I,5),P(N+I,4))
+ IF(ISI(I).EQ.0) P(N+I,5)=P(IPA(I),5)
+ 310 CONTINUE
+ ELSE
+ IF(MSTJ(43).LE.2) PEM=V(IM,2)
+ IF(MSTJ(43).GE.3) PEM=P(IM,4)
+ P(N+1,5)=MIN(P(IM,5),V(IM,1)*PEM)
+ P(N+2,5)=MIN(P(IM,5),(1.-V(IM,1))*PEM)
+ IF(K(N+2,2).EQ.22) P(N+2,5)=PMTH(1,22)
+ ENDIF
+ DO 320 I=1,NEP
+ PMSD(I)=P(N+I,5)
+ IF(ISI(I).EQ.1) THEN
+ IFLD=KFLD(I)
+ IF(KFLD(I).GE.6.AND.KFLD(I).LE.8) IFLD=37+KFLD(I)+
+ & ISIGN(2,K(N+I,2))
+ IF(P(N+I,5).LE.PMTH(3,IFLD)) P(N+I,5)=PMTH(1,IFLD)
+ ENDIF
+ V(N+I,5)=P(N+I,5)**2
+ 320 CONTINUE
+
+C...Choose one of the daughters for evolution.
+ 330 INUM=0
+ IF(NEP.EQ.1) INUM=1
+ DO 340 I=1,NEP
+ IF(INUM.EQ.0.AND.ISL(I).EQ.1) INUM=I
+ 340 CONTINUE
+ DO 350 I=1,NEP
+ IF(INUM.EQ.0.AND.ITRY(I).EQ.0.AND.ISI(I).EQ.1) THEN
+ IFLD=KFLD(I)
+ IF(KFLD(I).GE.6.AND.KFLD(I).LE.8) IFLD=37+KFLD(I)+
+ & ISIGN(2,K(N+I,2))
+ IF(P(N+I,5).GE.PMTH(2,IFLD)) INUM=I
+ ENDIF
+ 350 CONTINUE
+ IF(INUM.EQ.0) THEN
+ RMAX=0.
+ DO 360 I=1,NEP
+ IF(ISI(I).EQ.1.AND.PMSD(I).GE.PMQTH2) THEN
+ RPM=P(N+I,5)/PMSD(I)
+ IFLD=KFLD(I)
+ IF(KFLD(I).GE.6.AND.KFLD(I).LE.8) IFLD=37+KFLD(I)+
+ & ISIGN(2,K(N+I,2))
+ IF(RPM.GT.RMAX.AND.P(N+I,5).GE.PMTH(2,IFLD)) THEN
+ RMAX=RPM
+ INUM=I
+ ENDIF
+ ENDIF
+ 360 CONTINUE
+ ENDIF
+
+C...Store information on choice of evolving daughter.
+ INUM=MAX(1,INUM)
+ IEP(1)=N+INUM
+ DO 370 I=2,NEP
+ IEP(I)=IEP(I-1)+1
+ IF(IEP(I).GT.N+NEP) IEP(I)=N+1
+ 370 CONTINUE
+ DO 380 I=1,NEP
+ KFL(I)=IABS(K(IEP(I),2))
+ 380 CONTINUE
+ ITRY(INUM)=ITRY(INUM)+1
+ IF(ITRY(INUM).GT.200) THEN
+ CALL LUERRM(14,'(LUSHOW:) caught in infinite loop')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ Z=0.5
+ IF(KFL(1).GT.40) GOTO 430
+ IF(KSH(KFL(1)).EQ.0) GOTO 430
+ IFL=KFL(1)
+ IF(KFL(1).GE.6.AND.KFL(1).LE.8) IFL=37+KFL(1)+
+ &ISIGN(2,K(IEP(1),2))
+ IF(P(IEP(1),5).LT.PMTH(2,IFL)) GOTO 430
+
+C...Select side for interference with initial state partons.
+ IF(MIIS.GE.1.AND.IEP(1).LE.NS+3) THEN
+ III=IEP(1)-NS-1
+ ISII(III)=0
+ IF(IABS(KCII(III)).EQ.1.AND.NIIS(III).EQ.1) THEN
+ ISII(III)=1
+ ELSEIF(KCII(III).EQ.2.AND.NIIS(III).EQ.1) THEN
+ IF(RLU(0).GT.0.5) ISII(III)=1
+ ELSEIF(KCII(III).EQ.2.AND.NIIS(III).EQ.2) THEN
+ ISII(III)=1
+ IF(RLU(0).GT.0.5) ISII(III)=2
+ ENDIF
+ ENDIF
+
+C...Calculate allowed z range.
+ IF(NEP.EQ.1) THEN
+ PMED=PS(4)
+ ELSEIF(IGM.EQ.0.OR.MSTJ(43).LE.2) THEN
+ PMED=P(IM,5)
+ ELSE
+ IF(INUM.EQ.1) PMED=V(IM,1)*PEM
+ IF(INUM.EQ.2) PMED=(1.-V(IM,1))*PEM
+ ENDIF
+ IF(MOD(MSTJ(43),2).EQ.1) THEN
+ ZC=PMTH(2,21)/PMED
+ ZCE=PMTH(2,22)/PMED
+ ELSE
+ ZC=0.5*(1.-SQRT(MAX(0.D0,1.-(2.*PMTH(2,21)/PMED)**2)))
+ IF(ZC.LT.1D-4) ZC=(PMTH(2,21)/PMED)**2
+ ZCE=0.5*(1.-SQRT(MAX(0.D0,1.-(2.*PMTH(2,22)/PMED)**2)))
+ IF(ZCE.LT.1D-4) ZCE=(PMTH(2,22)/PMED)**2
+ ENDIF
+ ZC=MIN(ZC,0.491D0)
+ ZCE=MIN(ZCE,0.491D0)
+ IF((MSTJ(41).EQ.1.AND.ZC.GT.0.49).OR.(MSTJ(41).GE.2.AND.
+ &MIN(ZC,ZCE).GT.0.49)) THEN
+ P(IEP(1),5)=PMTH(1,IFL)
+ V(IEP(1),5)=P(IEP(1),5)**2
+ GOTO 430
+ ENDIF
+
+C...Integral of Altarelli-Parisi z kernel for QCD.
+ IF(MSTJ(49).EQ.0.AND.KFL(1).EQ.21) THEN
+ FBR=6.*LOG((1.-ZC)/ZC)+MSTJ(45)*(0.5-ZC)
+ ELSEIF(MSTJ(49).EQ.0) THEN
+ FBR=(8./3.)*LOG((1.-ZC)/ZC)
+
+C...Integral of Altarelli-Parisi z kernel for scalar gluon.
+ ELSEIF(MSTJ(49).EQ.1.AND.KFL(1).EQ.21) THEN
+ FBR=(PARJ(87)+MSTJ(45)*PARJ(88))*(1.-2.*ZC)
+ ELSEIF(MSTJ(49).EQ.1) THEN
+ FBR=(1.-2.*ZC)/3.
+ IF(IGM.EQ.0.AND.M3JC.EQ.1) FBR=4.*FBR
+
+C...Integral of Altarelli-Parisi z kernel for Abelian vector gluon.
+ ELSEIF(KFL(1).EQ.21) THEN
+ FBR=6.*MSTJ(45)*(0.5-ZC)
+ ELSE
+ FBR=2.*LOG((1.-ZC)/ZC)
+ ENDIF
+
+C...Reset QCD probability for lepton.
+ IF(KFL(1).GE.11.AND.KFL(1).LE.18) FBR=0.
+
+C...Integral of Altarelli-Parisi kernel for photon emission.
+ IF(MSTJ(41).GE.2.AND.KFL(1).GE.1.AND.KFL(1).LE.18) THEN
+ FBRE=(KCHG(KFL(1),1)/3.)**2*2.*LOG((1.-ZCE)/ZCE)
+ IF(MSTJ(41).EQ.10) FBRE=PARJ(84)*FBRE
+ ENDIF
+
+C...Inner veto algorithm starts. Find maximum mass for evolution.
+ 390 PMS=V(IEP(1),5)
+ IF(IGM.GE.0) THEN
+ PM2=0.
+ DO 400 I=2,NEP
+ PM=P(IEP(I),5)
+ IF(KFL(I).LE.40) THEN
+ IFLI=KFL(I)
+ IF(KFL(I).GE.6.AND.KFL(I).LE.8) IFLI=37+KFL(I)+
+ & ISIGN(2,K(IEP(I),2))
+ IF(KSH(KFL(I)).EQ.1) PM=PMTH(2,IFLI)
+ ENDIF
+ PM2=PM2+PM
+ 400 CONTINUE
+ PMS=MIN(PMS,(P(IM,5)-PM2)**2)
+ ENDIF
+
+C...Select mass for daughter in QCD evolution.
+ B0=27./6.
+ DO 410 IFF=4,MSTJ(45)
+ IF(PMS.GT.4.*PMTH(2,IFF)**2) B0=(33.-2.*IFF)/6.
+ 410 CONTINUE
+ IF(FBR.LT.1D-3) THEN
+ PMSQCD=0.
+ ELSEIF(MSTJ(44).LE.0) THEN
+ PMSQCD=PMS*EXP(MAX(-50.D0,LOG(RLU(0))*PARU(2)/(PARU(111)*FBR)))
+ ELSEIF(MSTJ(44).EQ.1) THEN
+ PMSQCD=4.*ALAMS*(0.25*PMS/ALAMS)**(RLU(0)**(B0/FBR))
+ ELSE
+ PMSQCD=PMS*EXP(MAX(-50.D0,ALFM*B0*LOG(RLU(0))/FBR))
+ ENDIF
+ IF(ZC.GT.0.49.OR.PMSQCD.LE.PMTH(4,IFL)**2) PMSQCD=PMTH(2,IFL)**2
+ V(IEP(1),5)=PMSQCD
+ MCE=1
+
+C...Select mass for daughter in QED evolution.
+ IF(MSTJ(41).GE.2.AND.KFL(1).GE.1.AND.KFL(1).LE.18) THEN
+ PMSQED=PMS*EXP(MAX(-50.D0,LOG(RLU(0))*PARU(2)/(PARU(101)*FBRE)))
+ IF(ZCE.GT.0.49.OR.PMSQED.LE.PMTH(5,IFL)**2) PMSQED=
+ & PMTH(2,IFL)**2
+ IF(PMSQED.GT.PMSQCD) THEN
+ V(IEP(1),5)=PMSQED
+ MCE=2
+ ENDIF
+ ENDIF
+
+C...Check whether daughter mass below cutoff.
+ P(IEP(1),5)=SQRT(V(IEP(1),5))
+ IF(P(IEP(1),5).LE.PMTH(3,IFL)) THEN
+ P(IEP(1),5)=PMTH(1,IFL)
+ V(IEP(1),5)=P(IEP(1),5)**2
+ GOTO 430
+ ENDIF
+
+C...Select z value of branching: q -> qgamma.
+ IF(MCE.EQ.2) THEN
+ Z=1.-(1.-ZCE)*(ZCE/(1.-ZCE))**RLU(0)
+ IF(1.+Z**2.LT.2.*RLU(0)) GOTO 390
+ K(IEP(1),5)=22
+
+C...Select z value of branching: q -> qg, g -> gg, g -> qqbar.
+ ELSEIF(MSTJ(49).NE.1.AND.KFL(1).NE.21) THEN
+ Z=1.-(1.-ZC)*(ZC/(1.-ZC))**RLU(0)
+ IF(1.+Z**2.LT.2.*RLU(0)) GOTO 390
+ K(IEP(1),5)=21
+ ELSEIF(MSTJ(49).EQ.0.AND.MSTJ(45)*(0.5-ZC).LT.RLU(0)*FBR) THEN
+ Z=(1.-ZC)*(ZC/(1.-ZC))**RLU(0)
+ IF(RLU(0).GT.0.5) Z=1.-Z
+ IF((1.-Z*(1.-Z))**2.LT.RLU(0)) GOTO 390
+ K(IEP(1),5)=21
+ ELSEIF(MSTJ(49).NE.1) THEN
+ Z=ZC+(1.-2.*ZC)*RLU(0)
+ IF(Z**2+(1.-Z)**2.LT.RLU(0)) GOTO 390
+ KFLB=1+INT(MSTJ(45)*RLU(0))
+ PMQ=4.*PMTH(2,KFLB)**2/V(IEP(1),5)
+ IF(PMQ.GE.1.) GOTO 390
+ PMQ0=4.*PMTH(2,21)**2/V(IEP(1),5)
+ IF(MOD(MSTJ(43),2).EQ.0.AND.(1.+0.5*PMQ)*SQRT(1.-PMQ).LT.
+ & RLU(0)*(1.+0.5*PMQ0)*SQRT(1.-PMQ0)) GOTO 390
+ K(IEP(1),5)=KFLB
+
+C...Ditto for scalar gluon model.
+ ELSEIF(KFL(1).NE.21) THEN
+ Z=1.-SQRT(ZC**2+RLU(0)*(1.-2.*ZC))
+ K(IEP(1),5)=21
+ ELSEIF(RLU(0)*(PARJ(87)+MSTJ(45)*PARJ(88)).LE.PARJ(87)) THEN
+ Z=ZC+(1.-2.*ZC)*RLU(0)
+ K(IEP(1),5)=21
+ ELSE
+ Z=ZC+(1.-2.*ZC)*RLU(0)
+ KFLB=1+INT(MSTJ(45)*RLU(0))
+ PMQ=4.*PMTH(2,KFLB)**2/V(IEP(1),5)
+ IF(PMQ.GE.1.) GOTO 390
+ K(IEP(1),5)=KFLB
+ ENDIF
+ IF(MCE.EQ.1.AND.MSTJ(44).GE.2) THEN
+ IF(Z*(1.-Z)*V(IEP(1),5).LT.PT2MIN) GOTO 390
+ IF(ALFM/LOG(V(IEP(1),5)*Z*(1.-Z)/ALAMS).LT.RLU(0)) GOTO 390
+ ENDIF
+
+C...Check if z consistent with chosen m.
+ IF(KFL(1).EQ.21) THEN
+ KFLGD1=IABS(K(IEP(1),5))
+ KFLGD2=KFLGD1
+ ELSE
+ KFLGD1=KFL(1)
+ KFLGD2=IABS(K(IEP(1),5))
+ ENDIF
+ IF(NEP.EQ.1) THEN
+ PED=PS(4)
+ ELSEIF(NEP.GE.3) THEN
+ PED=P(IEP(1),4)
+ ELSEIF(IGM.EQ.0.OR.MSTJ(43).LE.2) THEN
+ PED=0.5*(V(IM,5)+V(IEP(1),5)-PM2**2)/P(IM,5)
+ ELSE
+ IF(IEP(1).EQ.N+1) PED=V(IM,1)*PEM
+ IF(IEP(1).EQ.N+2) PED=(1.-V(IM,1))*PEM
+ ENDIF
+ IF(MOD(MSTJ(43),2).EQ.1) THEN
+ IFLGD1=KFLGD1
+ IF(KFLGD1.GE.6.AND.KFLGD1.LE.8) IFLGD1=IFL
+ PMQTH3=0.5*PARJ(82)
+ IF(KFLGD2.EQ.22) PMQTH3=0.5*PARJ(83)
+ PMQ1=(PMTH(1,IFLGD1)**2+PMQTH3**2)/V(IEP(1),5)
+ PMQ2=(PMTH(1,KFLGD2)**2+PMQTH3**2)/V(IEP(1),5)
+ ZD=SQRT(MAX(0.D0,(1.-V(IEP(1),5)/PED**2)*((1.-PMQ1-PMQ2)**2-
+ & 4.*PMQ1*PMQ2)))
+ ZH=1.+PMQ1-PMQ2
+ ELSE
+ ZD=SQRT(MAX(0.D0,1.-V(IEP(1),5)/PED**2))
+ ZH=1.
+ ENDIF
+ ZL=0.5*(ZH-ZD)
+ ZU=0.5*(ZH+ZD)
+ IF(Z.LT.ZL.OR.Z.GT.ZU) GOTO 390
+ IF(KFL(1).EQ.21) V(IEP(1),3)=LOG(ZU*(1.-ZL)/MAX(1D-20,ZL*
+ &(1.-ZU)))
+ IF(KFL(1).NE.21) V(IEP(1),3)=LOG((1.-ZL)/MAX(1D-10,1.-ZU))
+
+C...Width suppression for q -> q + g.
+ IF(MSTJ(40).NE.0.AND.KFL(1).NE.21) THEN
+ IF(IGM.EQ.0) THEN
+ EGLU=0.5*PS(5)*(1.-Z)*(1.+V(IEP(1),5)/V(NS+1,5))
+ ELSE
+ EGLU=PMED*(1.-Z)
+ ENDIF
+ CHI=PARJ(89)**2/(PARJ(89)**2+EGLU**2)
+ IF(MSTJ(40).EQ.1) THEN
+ IF(CHI.LT.RLU(0)) GOTO 390
+ ELSEIF(MSTJ(40).EQ.2) THEN
+ IF(1.-CHI.LT.RLU(0)) GOTO 390
+ ENDIF
+ ENDIF
+
+C...Three-jet matrix element correction.
+ IF(IGM.EQ.0.AND.M3JC.EQ.1) THEN
+ X1=Z*(1.+V(IEP(1),5)/V(NS+1,5))
+ X2=1.-V(IEP(1),5)/V(NS+1,5)
+ X3=(1.-X1)+(1.-X2)
+ IF(MCE.EQ.2) THEN
+ KI1=K(IPA(INUM),2)
+ KI2=K(IPA(3-INUM),2)
+ QF1=KCHG(IABS(KI1),1)*ISIGN(1,KI1)/3.
+ QF2=KCHG(IABS(KI2),1)*ISIGN(1,KI2)/3.
+ WSHOW=QF1**2*(1.-X1)/X3*(1.+(X1/(2.-X2))**2)+
+ & QF2**2*(1.-X2)/X3*(1.+(X2/(2.-X1))**2)
+ WME=(QF1*(1.-X1)/X3-QF2*(1.-X2)/X3)**2*(X1**2+X2**2)
+ ELSEIF(MSTJ(49).NE.1) THEN
+ WSHOW=1.+(1.-X1)/X3*(X1/(2.-X2))**2+
+ & (1.-X2)/X3*(X2/(2.-X1))**2
+ WME=X1**2+X2**2
+ IF(M3JCM.EQ.1) WME=WME-QME*X3-0.5*QME**2-
+ & (0.5*QME+0.25*QME**2)*((1.-X2)/MAX(1D-7,1.-X1)+
+ & (1.-X1)/MAX(1D-7,1.-X2))
+ ELSE
+ WSHOW=4.*X3*((1.-X1)/(2.-X2)**2+(1.-X2)/(2.-X1)**2)
+ WME=X3**2
+ IF(MSTJ(102).GE.2) WME=X3**2-2.*(1.+X3)*(1.-X1)*(1.-X2)*
+ & PARJ(171)
+ ENDIF
+ IF(WME.LT.RLU(0)*WSHOW) GOTO 390
+
+C...Impose angular ordering by rejection of nonordered emission.
+ ELSEIF(MCE.EQ.1.AND.IGM.GT.0.AND.MSTJ(42).GE.2) THEN
+ MAOM=1
+ ZM=V(IM,1)
+ IF(IEP(1).EQ.N+2) ZM=1.-V(IM,1)
+ THE2ID=Z*(1.-Z)*(ZM*P(IM,4))**2/V(IEP(1),5)
+ IAOM=IM
+ 420 IF(K(IAOM,5).EQ.22) THEN
+ IAOM=K(IAOM,3)
+ IF(K(IAOM,3).LE.NS) MAOM=0
+ IF(MAOM.EQ.1) GOTO 420
+ ENDIF
+ IF(MAOM.EQ.1) THEN
+ THE2IM=V(IAOM,1)*(1.-V(IAOM,1))*P(IAOM,4)**2/V(IAOM,5)
+ IF(THE2ID.LT.THE2IM) GOTO 390
+ ENDIF
+ ENDIF
+
+C...Impose user-defined maximum angle at first branching.
+ IF(MSTJ(48).EQ.1) THEN
+ IF(NEP.EQ.1.AND.IM.EQ.NS) THEN
+ THE2ID=Z*(1.-Z)*PS(4)**2/V(IEP(1),5)
+ IF(THE2ID.LT.1./PARJ(85)**2) GOTO 390
+ ELSEIF(NEP.EQ.2.AND.IEP(1).EQ.NS+2) THEN
+ THE2ID=Z*(1.-Z)*(0.5*P(IM,4))**2/V(IEP(1),5)
+ IF(THE2ID.LT.1./PARJ(85)**2) GOTO 390
+ ELSEIF(NEP.EQ.2.AND.IEP(1).EQ.NS+3) THEN
+ THE2ID=Z*(1.-Z)*(0.5*P(IM,4))**2/V(IEP(1),5)
+ IF(THE2ID.LT.1./PARJ(86)**2) GOTO 390
+ ENDIF
+ ENDIF
+
+C...Impose angular constraint in first branching from interference
+C...with initial state partons.
+ IF(MIIS.GE.2.AND.IEP(1).LE.NS+3) THEN
+ THE2D=MAX((1.-Z)/Z,Z/(1.-Z))*V(IEP(1),5)/(0.5*P(IM,4))**2
+ IF(IEP(1).EQ.NS+2.AND.ISII(1).GE.1) THEN
+ IF(THE2D.GT.THEIIS(1,ISII(1))**2) GOTO 390
+ ELSEIF(IEP(1).EQ.NS+3.AND.ISII(2).GE.1) THEN
+ IF(THE2D.GT.THEIIS(2,ISII(2))**2) GOTO 390
+ ENDIF
+ ENDIF
+
+C...End of inner veto algorithm. Check if only one leg evolved so far.
+ 430 V(IEP(1),1)=Z
+ ISL(1)=0
+ ISL(2)=0
+ IF(NEP.EQ.1) GOTO 460
+ IF(NEP.EQ.2.AND.P(IEP(1),5)+P(IEP(2),5).GE.P(IM,5)) GOTO 330
+ DO 440 I=1,NEP
+ IF(ITRY(I).EQ.0.AND.KFLD(I).LE.40) THEN
+ IF(KSH(KFLD(I)).EQ.1) THEN
+ IFLD=KFLD(I)
+ IF(KFLD(I).GE.6.AND.KFLD(I).LE.8) IFLD=37+KFLD(I)+
+ & ISIGN(2,K(N+I,2))
+ IF(P(N+I,5).GE.PMTH(2,IFLD)) GOTO 330
+ ENDIF
+ ENDIF
+ 440 CONTINUE
+
+C...Check if chosen multiplet m1,m2,z1,z2 is physical.
+ IF(NEP.EQ.3) THEN
+ PA1S=(P(N+1,4)+P(N+1,5))*(P(N+1,4)-P(N+1,5))
+ PA2S=(P(N+2,4)+P(N+2,5))*(P(N+2,4)-P(N+2,5))
+ PA3S=(P(N+3,4)+P(N+3,5))*(P(N+3,4)-P(N+3,5))
+ PTS=0.25*(2.*PA1S*PA2S+2.*PA1S*PA3S+2.*PA2S*PA3S-
+ & PA1S**2-PA2S**2-PA3S**2)/PA1S
+ IF(PTS.LE.0.) GOTO 330
+ ELSEIF(IGM.EQ.0.OR.MSTJ(43).LE.2.OR.MOD(MSTJ(43),2).EQ.0) THEN
+ DO 450 I1=N+1,N+2
+ KFLDA=IABS(K(I1,2))
+ IF(KFLDA.GT.40) GOTO 450
+ IF(KSH(KFLDA).EQ.0) GOTO 450
+ IFLDA=KFLDA
+ IF(KFLDA.GE.6.AND.KFLDA.LE.8) IFLDA=37+KFLDA+
+ & ISIGN(2,K(I1,2))
+ IF(P(I1,5).LT.PMTH(2,IFLDA)) GOTO 450
+ IF(KFLDA.EQ.21) THEN
+ KFLGD1=IABS(K(I1,5))
+ KFLGD2=KFLGD1
+ ELSE
+ KFLGD1=KFLDA
+ KFLGD2=IABS(K(I1,5))
+ ENDIF
+ I2=2*N+3-I1
+ IF(IGM.EQ.0.OR.MSTJ(43).LE.2) THEN
+ PED=0.5*(V(IM,5)+V(I1,5)-V(I2,5))/P(IM,5)
+ ELSE
+ IF(I1.EQ.N+1) ZM=V(IM,1)
+ IF(I1.EQ.N+2) ZM=1.-V(IM,1)
+ PML=SQRT((V(IM,5)-V(N+1,5)-V(N+2,5))**2-
+ & 4.*V(N+1,5)*V(N+2,5))
+ PED=PEM*(0.5*(V(IM,5)-PML+V(I1,5)-V(I2,5))+PML*ZM)/V(IM,5)
+ ENDIF
+ IF(MOD(MSTJ(43),2).EQ.1) THEN
+ PMQTH3=0.5*PARJ(82)
+ IF(KFLGD2.EQ.22) PMQTH3=0.5*PARJ(83)
+ IFLGD1=KFLGD1
+ IF(KFLGD1.GE.6.AND.KFLGD1.LE.8) IFLGD1=IFLDA
+ PMQ1=(PMTH(1,IFLGD1)**2+PMQTH3**2)/V(I1,5)
+ PMQ2=(PMTH(1,KFLGD2)**2+PMQTH3**2)/V(I1,5)
+ ZD=SQRT(MAX(0.D0,(1.-V(I1,5)/PED**2)*((1.-PMQ1-PMQ2)**2-
+ & 4.*PMQ1*PMQ2)))
+ ZH=1.+PMQ1-PMQ2
+ ELSE
+ ZD=SQRT(MAX(0.D0,1.-V(I1,5)/PED**2))
+ ZH=1.
+ ENDIF
+ ZL=0.5*(ZH-ZD)
+ ZU=0.5*(ZH+ZD)
+ IF(I1.EQ.N+1.AND.(V(I1,1).LT.ZL.OR.V(I1,1).GT.ZU)) ISL(1)=1
+ IF(I1.EQ.N+2.AND.(V(I1,1).LT.ZL.OR.V(I1,1).GT.ZU)) ISL(2)=1
+ IF(KFLDA.EQ.21) V(I1,4)=LOG(ZU*(1.-ZL)/MAX(1D-20,ZL*(1.-ZU)))
+ IF(KFLDA.NE.21) V(I1,4)=LOG((1.-ZL)/MAX(1D-10,1.-ZU))
+ 450 CONTINUE
+ IF(ISL(1).EQ.1.AND.ISL(2).EQ.1.AND.ISLM.NE.0) THEN
+ ISL(3-ISLM)=0
+ ISLM=3-ISLM
+ ELSEIF(ISL(1).EQ.1.AND.ISL(2).EQ.1) THEN
+ ZDR1=MAX(0.D0,V(N+1,3)/MAX(1D-6,V(N+1,4))-1.)
+ ZDR2=MAX(0.D0,V(N+2,3)/MAX(1D-6,V(N+2,4))-1.)
+ IF(ZDR2.GT.RLU(0)*(ZDR1+ZDR2)) ISL(1)=0
+ IF(ISL(1).EQ.1) ISL(2)=0
+ IF(ISL(1).EQ.0) ISLM=1
+ IF(ISL(2).EQ.0) ISLM=2
+ ENDIF
+ IF(ISL(1).EQ.1.OR.ISL(2).EQ.1) GOTO 330
+ ENDIF
+ IFLD1=KFLD(1)
+ IF(KFLD(1).GE.6.AND.KFLD(1).LE.8) IFLD1=37+KFLD(1)+
+ &ISIGN(2,K(N+1,2))
+ IFLD2=KFLD(2)
+ IF(KFLD(2).GE.6.AND.KFLD(2).LE.8) IFLD2=37+KFLD(2)+
+ &ISIGN(2,K(N+2,2))
+ IF(IGM.GT.0.AND.MOD(MSTJ(43),2).EQ.1.AND.(P(N+1,5).GE.
+ &PMTH(2,IFLD1).OR.P(N+2,5).GE.PMTH(2,IFLD2))) THEN
+ PMQ1=V(N+1,5)/V(IM,5)
+ PMQ2=V(N+2,5)/V(IM,5)
+ ZD=SQRT(MAX(0.D0,(1.-V(IM,5)/PEM**2)*((1.-PMQ1-PMQ2)**2-
+ & 4.*PMQ1*PMQ2)))
+ ZH=1.+PMQ1-PMQ2
+ ZL=0.5*(ZH-ZD)
+ ZU=0.5*(ZH+ZD)
+ IF(V(IM,1).LT.ZL.OR.V(IM,1).GT.ZU) GOTO 330
+ ENDIF
+
+C...Accepted branch. Construct four-momentum for initial partons.
+ 460 MAZIP=0
+ MAZIC=0
+ IF(NEP.EQ.1) THEN
+ P(N+1,1)=0.
+ P(N+1,2)=0.
+ P(N+1,3)=SQRT(MAX(0.D0,(P(IPA(1),4)+P(N+1,5))*(P(IPA(1),4)-
+ & P(N+1,5))))
+ P(N+1,4)=P(IPA(1),4)
+ V(N+1,2)=P(N+1,4)
+ ELSEIF(IGM.EQ.0.AND.NEP.EQ.2) THEN
+ PED1=0.5*(V(IM,5)+V(N+1,5)-V(N+2,5))/P(IM,5)
+ P(N+1,1)=0.
+ P(N+1,2)=0.
+ P(N+1,3)=SQRT(MAX(0.D0,(PED1+P(N+1,5))*(PED1-P(N+1,5))))
+ P(N+1,4)=PED1
+ P(N+2,1)=0.
+ P(N+2,2)=0.
+ P(N+2,3)=-P(N+1,3)
+ P(N+2,4)=P(IM,5)-PED1
+ V(N+1,2)=P(N+1,4)
+ V(N+2,2)=P(N+2,4)
+ ELSEIF(NEP.EQ.3) THEN
+ P(N+1,1)=0.
+ P(N+1,2)=0.
+ P(N+1,3)=SQRT(MAX(0.D0,PA1S))
+ P(N+2,1)=SQRT(PTS)
+ P(N+2,2)=0.
+ P(N+2,3)=0.5*(PA3S-PA2S-PA1S)/P(N+1,3)
+ P(N+3,1)=-P(N+2,1)
+ P(N+3,2)=0.
+ P(N+3,3)=-(P(N+1,3)+P(N+2,3))
+ V(N+1,2)=P(N+1,4)
+ V(N+2,2)=P(N+2,4)
+ V(N+3,2)=P(N+3,4)
+
+C...Construct transverse momentum for ordinary branching in shower.
+ ELSE
+ ZM=V(IM,1)
+ PZM=SQRT(MAX(0.D0,(PEM+P(IM,5))*(PEM-P(IM,5))))
+ PMLS=(V(IM,5)-V(N+1,5)-V(N+2,5))**2-4.*V(N+1,5)*V(N+2,5)
+ IF(PZM.LE.0.) THEN
+ PTS=0.
+ ELSEIF(MOD(MSTJ(43),2).EQ.1) THEN
+ PTS=(PEM**2*(ZM*(1.-ZM)*V(IM,5)-(1.-ZM)*V(N+1,5)-
+ & ZM*V(N+2,5))-0.25*PMLS)/PZM**2
+ ELSE
+ PTS=PMLS*(ZM*(1.-ZM)*PEM**2/V(IM,5)-0.25)/PZM**2
+ ENDIF
+ PT=SQRT(MAX(0.D0,PTS))
+
+C...Find coefficient of azimuthal asymmetry due to gluon polarization.
+ HAZIP=0.
+ IF(MSTJ(49).NE.1.AND.MOD(MSTJ(46),2).EQ.1.AND.K(IM,2).EQ.21.
+ & AND.IAU.NE.0) THEN
+ IF(K(IGM,3).NE.0) MAZIP=1
+ ZAU=V(IGM,1)
+ IF(IAU.EQ.IM+1) ZAU=1.-V(IGM,1)
+ IF(MAZIP.EQ.0) ZAU=0.
+ IF(K(IGM,2).NE.21) THEN
+ HAZIP=2.*ZAU/(1.+ZAU**2)
+ ELSE
+ HAZIP=(ZAU/(1.-ZAU*(1.-ZAU)))**2
+ ENDIF
+ IF(K(N+1,2).NE.21) THEN
+ HAZIP=HAZIP*(-2.*ZM*(1.-ZM))/(1.-2.*ZM*(1.-ZM))
+ ELSE
+ HAZIP=HAZIP*(ZM*(1.-ZM)/(1.-ZM*(1.-ZM)))**2
+ ENDIF
+ ENDIF
+
+C...Find coefficient of azimuthal asymmetry due to soft gluon
+C...interference.
+ HAZIC=0.
+ IF(MSTJ(49).NE.2.AND.MSTJ(46).GE.2.AND.(K(N+1,2).EQ.21.OR.
+ & K(N+2,2).EQ.21).AND.IAU.NE.0) THEN
+ IF(K(IGM,3).NE.0) MAZIC=N+1
+ IF(K(IGM,3).NE.0.AND.K(N+1,2).NE.21) MAZIC=N+2
+ IF(K(IGM,3).NE.0.AND.K(N+1,2).EQ.21.AND.K(N+2,2).EQ.21.AND.
+ & ZM.GT.0.5) MAZIC=N+2
+ IF(K(IAU,2).EQ.22) MAZIC=0
+ ZS=ZM
+ IF(MAZIC.EQ.N+2) ZS=1.-ZM
+ ZGM=V(IGM,1)
+ IF(IAU.EQ.IM-1) ZGM=1.-V(IGM,1)
+ IF(MAZIC.EQ.0) ZGM=1.
+ IF(MAZIC.NE.0) HAZIC=(P(IM,5)/P(IGM,5))*
+ & SQRT((1.-ZS)*(1.-ZGM)/(ZS*ZGM))
+ HAZIC=MIN(0.95D0,HAZIC)
+ ENDIF
+ ENDIF
+
+C...Construct kinematics for ordinary branching in shower.
+ 470 IF(NEP.EQ.2.AND.IGM.GT.0) THEN
+ IF(MOD(MSTJ(43),2).EQ.1) THEN
+ P(N+1,4)=PEM*V(IM,1)
+ ELSE
+ P(N+1,4)=PEM*(0.5*(V(IM,5)-SQRT(PMLS)+V(N+1,5)-V(N+2,5))+
+ & SQRT(PMLS)*ZM)/V(IM,5)
+ ENDIF
+ PHI=PARU(2)*RLU(0)
+ P(N+1,1)=PT*COS(PHI)
+ P(N+1,2)=PT*SIN(PHI)
+ IF(PZM.GT.0.) THEN
+ P(N+1,3)=0.5*(V(N+2,5)-V(N+1,5)-V(IM,5)+2.*PEM*P(N+1,4))/PZM
+ ELSE
+ P(N+1,3)=0.
+ ENDIF
+ P(N+2,1)=-P(N+1,1)
+ P(N+2,2)=-P(N+1,2)
+ P(N+2,3)=PZM-P(N+1,3)
+ P(N+2,4)=PEM-P(N+1,4)
+ IF(MSTJ(43).LE.2) THEN
+ V(N+1,2)=(PEM*P(N+1,4)-PZM*P(N+1,3))/P(IM,5)
+ V(N+2,2)=(PEM*P(N+2,4)-PZM*P(N+2,3))/P(IM,5)
+ ENDIF
+ ENDIF
+
+C...Rotate and boost daughters.
+ IF(IGM.GT.0) THEN
+ IF(MSTJ(43).LE.2) THEN
+ BEX=P(IGM,1)/P(IGM,4)
+ BEY=P(IGM,2)/P(IGM,4)
+ BEZ=P(IGM,3)/P(IGM,4)
+ GA=P(IGM,4)/P(IGM,5)
+ GABEP=GA*(GA*(BEX*P(IM,1)+BEY*P(IM,2)+BEZ*P(IM,3))/(1.+GA)-
+ & P(IM,4))
+ ELSE
+ BEX=0.
+ BEY=0.
+ BEZ=0.
+ GA=1.
+ GABEP=0.
+ ENDIF
+ THE=ULANGL(P(IM,3)+GABEP*BEZ,SQRT((P(IM,1)+GABEP*BEX)**2+
+ & (P(IM,2)+GABEP*BEY)**2))
+ PHI=ULANGL(P(IM,1)+GABEP*BEX,P(IM,2)+GABEP*BEY)
+ DO 480 I=N+1,N+2
+ DP(1)=COS(THE)*COS(PHI)*P(I,1)-SIN(PHI)*P(I,2)+
+ & SIN(THE)*COS(PHI)*P(I,3)
+ DP(2)=COS(THE)*SIN(PHI)*P(I,1)+COS(PHI)*P(I,2)+
+ & SIN(THE)*SIN(PHI)*P(I,3)
+ DP(3)=-SIN(THE)*P(I,1)+COS(THE)*P(I,3)
+ DP(4)=P(I,4)
+ DBP=BEX*DP(1)+BEY*DP(2)+BEZ*DP(3)
+ DGABP=GA*(GA*DBP/(1D0+GA)+DP(4))
+ P(I,1)=DP(1)+DGABP*BEX
+ P(I,2)=DP(2)+DGABP*BEY
+ P(I,3)=DP(3)+DGABP*BEZ
+ P(I,4)=GA*(DP(4)+DBP)
+ 480 CONTINUE
+ ENDIF
+
+C...Weight with azimuthal distribution, if required.
+ IF(MAZIP.NE.0.OR.MAZIC.NE.0) THEN
+ DO 490 J=1,3
+ DPT(1,J)=P(IM,J)
+ DPT(2,J)=P(IAU,J)
+ DPT(3,J)=P(N+1,J)
+ 490 CONTINUE
+ DPMA=DPT(1,1)*DPT(2,1)+DPT(1,2)*DPT(2,2)+DPT(1,3)*DPT(2,3)
+ DPMD=DPT(1,1)*DPT(3,1)+DPT(1,2)*DPT(3,2)+DPT(1,3)*DPT(3,3)
+ DPMM=DPT(1,1)**2+DPT(1,2)**2+DPT(1,3)**2
+ DO 500 J=1,3
+ DPT(4,J)=DPT(2,J)-DPMA*DPT(1,J)/DPMM
+ DPT(5,J)=DPT(3,J)-DPMD*DPT(1,J)/DPMM
+ 500 CONTINUE
+ DPT(4,4)=SQRT(DPT(4,1)**2+DPT(4,2)**2+DPT(4,3)**2)
+ DPT(5,4)=SQRT(DPT(5,1)**2+DPT(5,2)**2+DPT(5,3)**2)
+ IF(MIN(DPT(4,4),DPT(5,4)).GT.0.1*PARJ(82)) THEN
+ CAD=(DPT(4,1)*DPT(5,1)+DPT(4,2)*DPT(5,2)+
+ & DPT(4,3)*DPT(5,3))/(DPT(4,4)*DPT(5,4))
+ IF(MAZIP.NE.0) THEN
+ IF(1.+HAZIP*(2.*CAD**2-1.).LT.RLU(0)*(1.+ABS(HAZIP)))
+ & GOTO 470
+ ENDIF
+ IF(MAZIC.NE.0) THEN
+ IF(MAZIC.EQ.N+2) CAD=-CAD
+ IF((1.-HAZIC)*(1.-HAZIC*CAD)/(1.+HAZIC**2-2.*HAZIC*CAD)
+ & .LT.RLU(0)) GOTO 470
+ ENDIF
+ ENDIF
+ ENDIF
+
+C...Azimuthal anisotropy due to interference with initial state partons.
+ IF(MOD(MIIS,2).EQ.1.AND.IGM.EQ.NS+1.AND.(K(N+1,2).EQ.21.OR.
+ &K(N+2,2).EQ.21)) THEN
+ III=IM-NS-1
+ IF(ISII(III).GE.1) THEN
+ IAZIID=N+1
+ IF(K(N+1,2).NE.21) IAZIID=N+2
+ IF(K(N+1,2).EQ.21.AND.K(N+2,2).EQ.21.AND.
+ & P(N+1,4).GT.P(N+2,4)) IAZIID=N+2
+ THEIID=ULANGL(P(IAZIID,3),SQRT(P(IAZIID,1)**2+P(IAZIID,2)**2))
+ IF(III.EQ.2) THEIID=PARU(1)-THEIID
+ PHIIID=ULANGL(P(IAZIID,1),P(IAZIID,2))
+ HAZII=MIN(0.95D0,THEIID/THEIIS(III,ISII(III)))
+ CAD=COS(PHIIID-PHIIIS(III,ISII(III)))
+ PHIREL=ABS(PHIIID-PHIIIS(III,ISII(III)))
+ IF(PHIREL.GT.PARU(1)) PHIREL=PARU(2)-PHIREL
+ IF((1.-HAZII)*(1.-HAZII*CAD)/(1.+HAZII**2-2.*HAZII*CAD)
+ & .LT.RLU(0)) GOTO 470
+ ENDIF
+ ENDIF
+
+C...Continue loop over partons that may branch, until none left.
+ IF(IGM.GE.0) K(IM,1)=14
+ N=N+NEP
+ NEP=2
+ IF(N.GT.MSTU(4)-MSTU(32)-5) THEN
+ CALL LUERRM(11,'(LUSHOW:) no more memory left in LUJETS')
+ IF(MSTU(21).GE.1) N=NS
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ GOTO 270
+
+C...Set information on imagined shower initiator.
+ 510 IF(NPA.GE.2) THEN
+ K(NS+1,1)=11
+ K(NS+1,2)=94
+ K(NS+1,3)=IP1
+ IF(IP2.GT.0.AND.IP2.LT.IP1) K(NS+1,3)=IP2
+ K(NS+1,4)=NS+2
+ K(NS+1,5)=NS+1+NPA
+ IIM=1
+ ELSE
+ IIM=0
+ ENDIF
+
+C...Reconstruct string drawing information.
+ DO 520 I=NS+1+IIM,N
+ IF(K(I,1).LE.10.AND.K(I,2).EQ.22) THEN
+ K(I,1)=1
+ ELSEIF(K(I,1).LE.10.AND.IABS(K(I,2)).GE.11.AND.
+ &IABS(K(I,2)).LE.18) THEN
+ K(I,1)=1
+ ELSEIF(K(I,1).LE.10) THEN
+ K(I,4)=MSTU(5)*(K(I,4)/MSTU(5))
+ K(I,5)=MSTU(5)*(K(I,5)/MSTU(5))
+ ELSEIF(K(MOD(K(I,4),MSTU(5))+1,2).NE.22) THEN
+ ID1=MOD(K(I,4),MSTU(5))
+ IF(K(I,2).GE.1.AND.K(I,2).LE.8) ID1=MOD(K(I,4),MSTU(5))+1
+ ID2=2*MOD(K(I,4),MSTU(5))+1-ID1
+ K(I,4)=MSTU(5)*(K(I,4)/MSTU(5))+ID1
+ K(I,5)=MSTU(5)*(K(I,5)/MSTU(5))+ID2
+ K(ID1,4)=K(ID1,4)+MSTU(5)*I
+ K(ID1,5)=K(ID1,5)+MSTU(5)*ID2
+ K(ID2,4)=K(ID2,4)+MSTU(5)*ID1
+ K(ID2,5)=K(ID2,5)+MSTU(5)*I
+ ELSE
+ ID1=MOD(K(I,4),MSTU(5))
+ ID2=ID1+1
+ K(I,4)=MSTU(5)*(K(I,4)/MSTU(5))+ID1
+ K(I,5)=MSTU(5)*(K(I,5)/MSTU(5))+ID1
+ IF(IABS(K(I,2)).LE.10.OR.K(ID1,1).GE.11) THEN
+ K(ID1,4)=K(ID1,4)+MSTU(5)*I
+ K(ID1,5)=K(ID1,5)+MSTU(5)*I
+ ELSE
+ K(ID1,4)=0
+ K(ID1,5)=0
+ ENDIF
+ K(ID2,4)=0
+ K(ID2,5)=0
+ ENDIF
+ 520 CONTINUE
+
+C...Transformation from CM frame.
+ IF(NPA.GE.2) THEN
+ BEX=PS(1)/PS(4)
+ BEY=PS(2)/PS(4)
+ BEZ=PS(3)/PS(4)
+ GA=PS(4)/PS(5)
+ GABEP=GA*(GA*(BEX*P(IPA(1),1)+BEY*P(IPA(1),2)+BEZ*P(IPA(1),3))
+ & /(1.+GA)-P(IPA(1),4))
+ ELSE
+ BEX=0.
+ BEY=0.
+ BEZ=0.
+ GABEP=0.
+ ENDIF
+ THE=ULANGL(P(IPA(1),3)+GABEP*BEZ,SQRT((P(IPA(1),1)
+ &+GABEP*BEX)**2+(P(IPA(1),2)+GABEP*BEY)**2))
+ PHI=ULANGL(P(IPA(1),1)+GABEP*BEX,P(IPA(1),2)+GABEP*BEY)
+ IF(NPA.EQ.3) THEN
+ CHI=ULANGL(COS(THE)*COS(PHI)*(P(IPA(2),1)+GABEP*BEX)+COS(THE)*
+ & SIN(PHI)*(P(IPA(2),2)+GABEP*BEY)-SIN(THE)*(P(IPA(2),3)+GABEP*
+ & BEZ),-SIN(PHI)*(P(IPA(2),1)+GABEP*BEX)+COS(PHI)*(P(IPA(2),2)+
+ & GABEP*BEY))
+ MSTU(33)=1
+ CALL LUDBRB(NS+1,N,0.D0,CHI,0D0,0D0,0D0)
+ ENDIF
+ DBEX=DBLE(BEX)
+ DBEY=DBLE(BEY)
+ DBEZ=DBLE(BEZ)
+ MSTU(33)=1
+ CALL LUDBRB(NS+1,N,THE,PHI,DBEX,DBEY,DBEZ)
+
+C...Decay vertex of shower.
+ DO 540 I=NS+1,N
+ DO 530 J=1,5
+ V(I,J)=V(IP1,J)
+ 530 CONTINUE
+ 540 CONTINUE
+
+C...Delete trivial shower, else connect initiators.
+ IF(N.EQ.NS+NPA+IIM) THEN
+ N=NS
+ ELSE
+ DO 550 IP=1,NPA
+ K(IPA(IP),1)=14
+ K(IPA(IP),4)=K(IPA(IP),4)+NS+IIM+IP
+ K(IPA(IP),5)=K(IPA(IP),5)+NS+IIM+IP
+ K(NS+IIM+IP,3)=IPA(IP)
+ IF(IIM.EQ.1.AND.MSTU(16).NE.2) K(NS+IIM+IP,3)=NS+1
+ IF(K(NS+IIM+IP,1).NE.1) THEN
+ K(NS+IIM+IP,4)=MSTU(5)*IPA(IP)+K(NS+IIM+IP,4)
+ K(NS+IIM+IP,5)=MSTU(5)*IPA(IP)+K(NS+IIM+IP,5)
+ ENDIF
+ 550 CONTINUE
+ ENDIF
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUBOEI
+ SUBROUTINE LUBOEI(NSAV)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to modify event so as to approximately take into account
+C...Bose-Einstein effects according to a simple phenomenological
+C...parametrization.
+C IMPLICIT DOUBLE PRECISION(D)
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ SAVE /LUJETS/,/LUDAT1/
+ DIMENSION DPS(4),KFBE(9),NBE(0:9),BEI(100)
+ DATA KFBE/211,-211,111,321,-321,130,310,221,331/
+
+C...Boost event to overall CM frame. Calculate CM energy.
+ IF((MSTJ(51).NE.1.AND.MSTJ(51).NE.2).OR.N-NSAV.LE.1) RETURN
+ DO 100 J=1,4
+ DPS(J)=0.
+ 100 CONTINUE
+ DO 120 I=1,N
+ KFA=IABS(K(I,2))
+ IF(K(I,1).LE.10.AND.((KFA.GT.10.AND.KFA.LE.20).OR.KFA.EQ.22).AND.
+ &K(I,3).GT.0) THEN
+ KFMA=IABS(K(K(I,3),2))
+ IF(KFMA.GT.10.AND.KFMA.LE.80) K(I,1)=-K(I,1)
+ ENDIF
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 120
+ DO 110 J=1,4
+ DPS(J)=DPS(J)+P(I,J)
+ 110 CONTINUE
+ 120 CONTINUE
+ CALL LUDBRB(0,0,0.D0,0.D0,-DPS(1)/DPS(4),-DPS(2)/DPS(4),
+ &-DPS(3)/DPS(4))
+ PECM=0.
+ DO 130 I=1,N
+ IF(K(I,1).GE.1.AND.K(I,1).LE.10) PECM=PECM+P(I,4)
+ 130 CONTINUE
+
+C...Reserve copy of particles by species at end of record.
+ NBE(0)=N+MSTU(3)
+ DO 160 IBE=1,MIN(9,MSTJ(52))
+ NBE(IBE)=NBE(IBE-1)
+ DO 150 I=NSAV+1,N
+ IF(K(I,2).NE.KFBE(IBE)) GOTO 150
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 150
+ IF(NBE(IBE).GE.MSTU(4)-MSTU(32)-5) THEN
+ CALL LUERRM(11,'(LUBOEI:) no more memory left in LUJETS')
+ RETURN
+ ENDIF
+ NBE(IBE)=NBE(IBE)+1
+ K(NBE(IBE),1)=I
+ DO 140 J=1,3
+ P(NBE(IBE),J)=0.
+ 140 CONTINUE
+ 150 CONTINUE
+ 160 CONTINUE
+ IF(NBE(MIN(9,MSTJ(52)))-NBE(0).LE.1) GOTO 280
+
+C...Tabulate integral for subsequent momentum shift.
+ DO 220 IBE=1,MIN(9,MSTJ(52))
+ IF(IBE.NE.1.AND.IBE.NE.4.AND.IBE.LE.7) GOTO 180
+ IF(IBE.EQ.1.AND.MAX(NBE(1)-NBE(0),NBE(2)-NBE(1),NBE(3)-NBE(2))
+ &.LE.1) GOTO 180
+ IF(IBE.EQ.4.AND.MAX(NBE(4)-NBE(3),NBE(5)-NBE(4),NBE(6)-NBE(5),
+ &NBE(7)-NBE(6)).LE.1) GOTO 180
+ IF(IBE.GE.8.AND.NBE(IBE)-NBE(IBE-1).LE.1) GOTO 180
+ IF(IBE.EQ.1) PMHQ=2.*ULMASS(211)
+ IF(IBE.EQ.4) PMHQ=2.*ULMASS(321)
+ IF(IBE.EQ.8) PMHQ=2.*ULMASS(221)
+ IF(IBE.EQ.9) PMHQ=2.*ULMASS(331)
+ QDEL=0.1*MIN(PMHQ,PARJ(93))
+ IF(MSTJ(51).EQ.1) THEN
+ NBIN=MIN(100,NINT(9.*PARJ(93)/QDEL))
+ BEEX=EXP(0.5*QDEL/PARJ(93))
+ BERT=EXP(-QDEL/PARJ(93))
+ ELSE
+ NBIN=MIN(100,NINT(3.*PARJ(93)/QDEL))
+ ENDIF
+ DO 170 IBIN=1,NBIN
+ QBIN=QDEL*(IBIN-0.5)
+ BEI(IBIN)=QDEL*(QBIN**2+QDEL**2/12.)/SQRT(QBIN**2+PMHQ**2)
+ IF(MSTJ(51).EQ.1) THEN
+ BEEX=BEEX*BERT
+ BEI(IBIN)=BEI(IBIN)*BEEX
+ ELSE
+ BEI(IBIN)=BEI(IBIN)*EXP(-(QBIN/PARJ(93))**2)
+ ENDIF
+ IF(IBIN.GE.2) BEI(IBIN)=BEI(IBIN)+BEI(IBIN-1)
+ 170 CONTINUE
+
+C...Loop through particle pairs and find old relative momentum.
+ 180 DO 210 I1M=NBE(IBE-1)+1,NBE(IBE)-1
+ I1=K(I1M,1)
+ DO 200 I2M=I1M+1,NBE(IBE)
+ I2=K(I2M,1)
+ Q2OLD=MAX(0.D0,(P(I1,4)+P(I2,4))**2-(P(I1,1)+P(I2,1))**2-(P(I1,2)+
+ &P(I2,2))**2-(P(I1,3)+P(I2,3))**2-(P(I1,5)+P(I2,5))**2)
+ QOLD=SQRT(Q2OLD)
+
+C...Calculate new relative momentum.
+ IF(QOLD.LT.1D-3*QDEL) THEN
+ GOTO 200
+ ELSEIF(QOLD.LE.QDEL) THEN
+ QMOV=QOLD/3.
+ ELSEIF(QOLD.LT.(NBIN-0.1)*QDEL) THEN
+ RBIN=QOLD/QDEL
+ IBIN=RBIN
+ RINP=(RBIN**3-IBIN**3)/(3*IBIN*(IBIN+1)+1)
+ QMOV=(BEI(IBIN)+RINP*(BEI(IBIN+1)-BEI(IBIN)))*
+ & SQRT(Q2OLD+PMHQ**2)/Q2OLD
+ ELSE
+ QMOV=BEI(NBIN)*SQRT(Q2OLD+PMHQ**2)/Q2OLD
+ ENDIF
+ Q2NEW=Q2OLD*(QOLD/(QOLD+3.*PARJ(92)*QMOV))**(2./3.)
+
+C...Calculate and save shift to be performed on three-momenta.
+ HC1=(P(I1,4)+P(I2,4))**2-(Q2OLD-Q2NEW)
+ HC2=(Q2OLD-Q2NEW)*(P(I1,4)-P(I2,4))**2
+ HA=0.5*(1.-SQRT(HC1*Q2NEW/(HC1*Q2OLD-HC2)))
+ DO 190 J=1,3
+ PD=HA*(P(I2,J)-P(I1,J))
+ P(I1M,J)=P(I1M,J)+PD
+ P(I2M,J)=P(I2M,J)-PD
+ 190 CONTINUE
+ 200 CONTINUE
+ 210 CONTINUE
+ 220 CONTINUE
+
+C...Shift momenta and recalculate energies.
+ DO 240 IM=NBE(0)+1,NBE(MIN(9,MSTJ(52)))
+ I=K(IM,1)
+ DO 230 J=1,3
+ P(I,J)=P(I,J)+P(IM,J)
+ 230 CONTINUE
+ P(I,4)=SQRT(P(I,5)**2+P(I,1)**2+P(I,2)**2+P(I,3)**2)
+ 240 CONTINUE
+
+C...Rescale all momenta for energy conservation.
+ PES=0.
+ PQS=0.
+ DO 250 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 250
+ PES=PES+P(I,4)
+ PQS=PQS+P(I,5)**2/P(I,4)
+ 250 CONTINUE
+ FAC=(PECM-PQS)/(PES-PQS)
+ DO 270 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 270
+ DO 260 J=1,3
+ P(I,J)=FAC*P(I,J)
+ 260 CONTINUE
+ P(I,4)=SQRT(P(I,5)**2+P(I,1)**2+P(I,2)**2+P(I,3)**2)
+ 270 CONTINUE
+
+C...Boost back to correct reference frame.
+ 280 CALL
+ & LUDBRB(0,0,0.D0,0.D0,DPS(1)/DPS(4),DPS(2)/DPS(4),DPS(3)/DPS(4))
+ DO 290 I=1,N
+ IF(K(I,1).LT.0) K(I,1)=-K(I,1)
+ 290 CONTINUE
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, ULMASS
+ FUNCTION ULMASS(KF)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to give the mass of a particle/parton.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUDAT1/,/LUDAT2/
+
+C...Reset variables. Compressed code.
+ ULMASS=0.
+ KFA=IABS(KF)
+ KC=LUCOMP(KF)
+ IF(KC.EQ.0) RETURN
+ PARF(106)=PMAS(6,1)
+ PARF(107)=PMAS(7,1)
+ PARF(108)=PMAS(8,1)
+
+C...Guarantee use of constituent masses for internal checks.
+ IF((MSTJ(93).EQ.1.OR.MSTJ(93).EQ.2).AND.KFA.LE.10) THEN
+ ULMASS=PARF(100+KFA)
+ IF(MSTJ(93).EQ.2) ULMASS=MAX(0.D0,ULMASS-PARF(121))
+
+C...Masses that can be read directly off table.
+ ELSEIF(KFA.LE.100.OR.KC.LE.80.OR.KC.GT.100) THEN
+ ULMASS=PMAS(KC,1)
+
+C...Find constituent partons and their masses.
+ ELSE
+ KFLA=MOD(KFA/1000,10)
+ KFLB=MOD(KFA/100,10)
+ KFLC=MOD(KFA/10,10)
+ KFLS=MOD(KFA,10)
+ KFLR=MOD(KFA/10000,10)
+ PMA=PARF(100+KFLA)
+ PMB=PARF(100+KFLB)
+ PMC=PARF(100+KFLC)
+
+C...Construct masses for various meson, diquark and baryon cases.
+ IF(KFLA.EQ.0.AND.KFLR.EQ.0.AND.KFLS.LE.3) THEN
+ IF(KFLS.EQ.1) PMSPL=-3./(PMB*PMC)
+ IF(KFLS.GE.3) PMSPL=1./(PMB*PMC)
+ ULMASS=PARF(111)+PMB+PMC+PARF(113)*PARF(101)**2*PMSPL
+ ELSEIF(KFLA.EQ.0) THEN
+ KMUL=2
+ IF(KFLS.EQ.1) KMUL=3
+ IF(KFLR.EQ.2) KMUL=4
+ IF(KFLS.EQ.5) KMUL=5
+ ULMASS=PARF(113+KMUL)+PMB+PMC
+ ELSEIF(KFLC.EQ.0) THEN
+ IF(KFLS.EQ.1) PMSPL=-3./(PMA*PMB)
+ IF(KFLS.EQ.3) PMSPL=1./(PMA*PMB)
+ ULMASS=2.*PARF(112)/3.+PMA+PMB+PARF(114)*PARF(101)**2*PMSPL
+ IF(MSTJ(93).EQ.1) ULMASS=PMA+PMB
+ IF(MSTJ(93).EQ.2) ULMASS=MAX(0.D0,ULMASS-PARF(122)-
+ & 2.*PARF(112)/3.)
+ ELSE
+ IF(KFLS.EQ.2.AND.KFLA.EQ.KFLB) THEN
+ PMSPL=1./(PMA*PMB)-2./(PMA*PMC)-2./(PMB*PMC)
+ ELSEIF(KFLS.EQ.2.AND.KFLB.GE.KFLC) THEN
+ PMSPL=-2./(PMA*PMB)-2./(PMA*PMC)+1./(PMB*PMC)
+ ELSEIF(KFLS.EQ.2) THEN
+ PMSPL=-3./(PMB*PMC)
+ ELSE
+ PMSPL=1./(PMA*PMB)+1./(PMA*PMC)+1./(PMB*PMC)
+ ENDIF
+ ULMASS=PARF(112)+PMA+PMB+PMC+PARF(114)*PARF(101)**2*PMSPL
+ ENDIF
+ ENDIF
+
+C...Optional mass broadening according to truncated Breit-Wigner
+C...(either in m or in m^2).
+ IF(MSTJ(24).GE.1.AND.PMAS(KC,2).GT.1D-4) THEN
+ IF(MSTJ(24).EQ.1.OR.(MSTJ(24).EQ.2.AND.KFA.GT.100)) THEN
+ ULMASS=ULMASS+0.5*PMAS(KC,2)*TAN((2.*RLU(0)-1.)*
+ & ATAN(2.*PMAS(KC,3)/PMAS(KC,2)))
+ ELSE
+ PM0=ULMASS
+ PMLOW=ATAN((MAX(0.D0,PM0-PMAS(KC,3))**2-PM0**2)/
+ & (PM0*PMAS(KC,2)))
+ PMUPP=ATAN(((PM0+PMAS(KC,3))**2-PM0**2)/(PM0*PMAS(KC,2)))
+ ULMASS=SQRT(MAX(0.D0,PM0**2+PM0*PMAS(KC,2)*TAN(PMLOW+
+ & (PMUPP-PMLOW)*RLU(0))))
+ ENDIF
+ ENDIF
+ MSTJ(93)=0
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUNAME
+ SUBROUTINE LUNAME(KF,CHAU)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to give the particle/parton name as a character string.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ COMMON/LUDAT4/CHAF(500)
+ CHARACTER CHAF*8
+ SAVE /LUDAT1/,/LUDAT2/,/LUDAT4/
+ CHARACTER CHAU*16
+
+C...Initial values. Charge. Subdivide code.
+ CHAU=' '
+ KFA=IABS(KF)
+ KC=LUCOMP(KF)
+ IF(KC.EQ.0) RETURN
+ KQ=LUCHGE(KF)
+ KFLA=MOD(KFA/1000,10)
+ KFLB=MOD(KFA/100,10)
+ KFLC=MOD(KFA/10,10)
+ KFLS=MOD(KFA,10)
+ KFLR=MOD(KFA/10000,10)
+
+C...Read out root name and spin for simple particle.
+ IF(KFA.LE.100.OR.(KFA.GT.100.AND.KC.GT.100)) THEN
+ CHAU=CHAF(KC)
+ LEN=0
+ DO 100 LEM=1,8
+ IF(CHAU(LEM:LEM).NE.' ') LEN=LEM
+ 100 CONTINUE
+
+C...Construct root name for diquark. Add on spin.
+ ELSEIF(KFLC.EQ.0) THEN
+ CHAU(1:2)=CHAF(KFLA)(1:1)//CHAF(KFLB)(1:1)
+ IF(KFLS.EQ.1) CHAU(3:4)='_0'
+ IF(KFLS.EQ.3) CHAU(3:4)='_1'
+ LEN=4
+
+C...Construct root name for heavy meson. Add on spin and heavy flavour.
+ ELSEIF(KFLA.EQ.0) THEN
+ IF(KFLB.EQ.5) CHAU(1:1)='B'
+ IF(KFLB.EQ.6) CHAU(1:1)='T'
+ IF(KFLB.EQ.7) CHAU(1:1)='L'
+ IF(KFLB.EQ.8) CHAU(1:1)='H'
+ LEN=1
+ IF(KFLR.EQ.0.AND.KFLS.EQ.1) THEN
+ ELSEIF(KFLR.EQ.0.AND.KFLS.EQ.3) THEN
+ CHAU(2:2)='*'
+ LEN=2
+ ELSEIF(KFLR.EQ.1.AND.KFLS.EQ.3) THEN
+ CHAU(2:3)='_1'
+ LEN=3
+ ELSEIF(KFLR.EQ.1.AND.KFLS.EQ.1) THEN
+ CHAU(2:4)='*_0'
+ LEN=4
+ ELSEIF(KFLR.EQ.2) THEN
+ CHAU(2:4)='*_1'
+ LEN=4
+ ELSEIF(KFLS.EQ.5) THEN
+ CHAU(2:4)='*_2'
+ LEN=4
+ ENDIF
+ IF(KFLC.GE.3.AND.KFLR.EQ.0.AND.KFLS.LE.3) THEN
+ CHAU(LEN+1:LEN+2)='_'//CHAF(KFLC)(1:1)
+ LEN=LEN+2
+ ELSEIF(KFLC.GE.3) THEN
+ CHAU(LEN+1:LEN+1)=CHAF(KFLC)(1:1)
+ LEN=LEN+1
+ ENDIF
+
+C...Construct root name and spin for heavy baryon.
+ ELSE
+ IF(KFLB.LE.2.AND.KFLC.LE.2) THEN
+ CHAU='Sigma '
+ IF(KFLC.GT.KFLB) CHAU='Lambda'
+ IF(KFLS.EQ.4) CHAU='Sigma*'
+ LEN=5
+ IF(CHAU(6:6).NE.' ') LEN=6
+ ELSEIF(KFLB.LE.2.OR.KFLC.LE.2) THEN
+ CHAU='Xi '
+ IF(KFLA.GT.KFLB.AND.KFLB.GT.KFLC) CHAU='Xi'''
+ IF(KFLS.EQ.4) CHAU='Xi*'
+ LEN=2
+ IF(CHAU(3:3).NE.' ') LEN=3
+ ELSE
+ CHAU='Omega '
+ IF(KFLA.GT.KFLB.AND.KFLB.GT.KFLC) CHAU='Omega'''
+ IF(KFLS.EQ.4) CHAU='Omega*'
+ LEN=5
+ IF(CHAU(6:6).NE.' ') LEN=6
+ ENDIF
+
+C...Add on heavy flavour content for heavy baryon.
+ CHAU(LEN+1:LEN+2)='_'//CHAF(KFLA)(1:1)
+ LEN=LEN+2
+ IF(KFLB.GE.KFLC.AND.KFLC.GE.4) THEN
+ CHAU(LEN+1:LEN+2)=CHAF(KFLB)(1:1)//CHAF(KFLC)(1:1)
+ LEN=LEN+2
+ ELSEIF(KFLB.GE.KFLC.AND.KFLB.GE.4) THEN
+ CHAU(LEN+1:LEN+1)=CHAF(KFLB)(1:1)
+ LEN=LEN+1
+ ELSEIF(KFLC.GT.KFLB.AND.KFLB.GE.4) THEN
+ CHAU(LEN+1:LEN+2)=CHAF(KFLC)(1:1)//CHAF(KFLB)(1:1)
+ LEN=LEN+2
+ ELSEIF(KFLC.GT.KFLB.AND.KFLC.GE.4) THEN
+ CHAU(LEN+1:LEN+1)=CHAF(KFLC)(1:1)
+ LEN=LEN+1
+ ENDIF
+ ENDIF
+
+C...Add on bar sign for antiparticle (where necessary).
+ IF(KF.GT.0.OR.LEN.EQ.0) THEN
+ ELSEIF(KFA.GT.10.AND.KFA.LE.40.AND.KQ.NE.0.AND.MOD(KQ,3).EQ.0)
+ &THEN
+ ELSEIF(KFA.EQ.89.OR.(KFA.GE.91.AND.KFA.LE.99)) THEN
+ ELSEIF(KFA.GT.100.AND.KFLA.EQ.0.AND.KQ.NE.0) THEN
+ ELSEIF(MSTU(15).LE.1) THEN
+ CHAU(LEN+1:LEN+1)='~'
+ LEN=LEN+1
+ ELSE
+ CHAU(LEN+1:LEN+3)='bar'
+ LEN=LEN+3
+ ENDIF
+
+C...Add on charge where applicable (conventional cases skipped).
+ IF(KQ.EQ.6) CHAU(LEN+1:LEN+2)='++'
+ IF(KQ.EQ.-6) CHAU(LEN+1:LEN+2)='--'
+ IF(KQ.EQ.3) CHAU(LEN+1:LEN+1)='+'
+ IF(KQ.EQ.-3) CHAU(LEN+1:LEN+1)='-'
+ IF(KQ.EQ.0.AND.(KFA.LE.22.OR.LEN.EQ.0)) THEN
+ ELSEIF(KQ.EQ.0.AND.(KFA.GE.81.AND.KFA.LE.100)) THEN
+ ELSEIF(KFA.EQ.28.OR.KFA.EQ.29) THEN
+ ELSEIF(KFA.GT.100.AND.KFLA.EQ.0.AND.KFLB.EQ.KFLC.AND.
+ &KFLB.NE.1) THEN
+ ELSEIF(KQ.EQ.0) THEN
+ CHAU(LEN+1:LEN+1)='0'
+ ENDIF
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUCHGE
+ FUNCTION LUCHGE(KF)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to give three times the charge for a particle/parton.
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUDAT2/
+
+C...Initial values. Simple case of direct readout.
+ LUCHGE=0
+ KFA=IABS(KF)
+ KC=LUCOMP(KFA)
+ IF(KC.EQ.0) THEN
+ ELSEIF(KFA.LE.100.OR.KC.LE.80.OR.KC.GT.100) THEN
+ LUCHGE=KCHG(KC,1)
+
+C...Construction from quark content for heavy meson, diquark, baryon.
+ ELSEIF(MOD(KFA/1000,10).EQ.0) THEN
+ LUCHGE=(KCHG(MOD(KFA/100,10),1)-KCHG(MOD(KFA/10,10),1))*
+ & (-1)**MOD(KFA/100,10)
+ ELSEIF(MOD(KFA/10,10).EQ.0) THEN
+ LUCHGE=KCHG(MOD(KFA/1000,10),1)+KCHG(MOD(KFA/100,10),1)
+ ELSE
+ LUCHGE=KCHG(MOD(KFA/1000,10),1)+KCHG(MOD(KFA/100,10),1)+
+ & KCHG(MOD(KFA/10,10),1)
+ ENDIF
+
+C...Add on correct sign.
+ LUCHGE=LUCHGE*ISIGN(1,KF)
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUCOMP
+ FUNCTION LUCOMP(KF)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to compress the standard KF codes for use in mass and decay
+C...arrays; also to check whether a given code actually is defined.
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUDAT2/
+ DIMENSION KFTAB(25),KCTAB(25)
+ DATA KFTAB/211,111,221,311,321,130,310,213,113,223,
+ &313,323,2112,2212,210,2110,2210,110,220,330,440,30443,30553,0,0/
+ DATA KCTAB/101,111,112,102,103,221,222,121,131,132,
+ &122,123,332,333,281,282,283,284,285,286,287,231,235,0,0/
+
+C...Starting values.
+ LUCOMP=0
+ KFA=IABS(KF)
+
+C...Simple cases: direct translation or table.
+ IF(KFA.EQ.0.OR.KFA.GE.100000) THEN
+ RETURN
+ ELSEIF(KFA.LE.100) THEN
+ LUCOMP=KFA
+ IF(KF.LT.0.AND.KCHG(KFA,3).EQ.0) LUCOMP=0
+ RETURN
+ ELSE
+ DO 100 IKF=1,23
+ IF(KFA.EQ.KFTAB(IKF)) THEN
+ LUCOMP=KCTAB(IKF)
+ IF(KF.LT.0.AND.KCHG(LUCOMP,3).EQ.0) LUCOMP=0
+ RETURN
+ ENDIF
+ 100 CONTINUE
+ ENDIF
+
+C...Subdivide KF code into constituent pieces.
+ KFLA=MOD(KFA/1000,10)
+ KFLB=MOD(KFA/100,10)
+ KFLC=MOD(KFA/10,10)
+ KFLS=MOD(KFA,10)
+ KFLR=MOD(KFA/10000,10)
+
+C...Mesons.
+ IF(KFA-10000*KFLR.LT.1000) THEN
+ IF(KFLB.EQ.0.OR.KFLB.EQ.9.OR.KFLC.EQ.0.OR.KFLC.EQ.9) THEN
+ ELSEIF(KFLB.LT.KFLC) THEN
+ ELSEIF(KF.LT.0.AND.KFLB.EQ.KFLC) THEN
+ ELSEIF(KFLB.EQ.KFLC) THEN
+ IF(KFLR.EQ.0.AND.KFLS.EQ.1) THEN
+ LUCOMP=110+KFLB
+ ELSEIF(KFLR.EQ.0.AND.KFLS.EQ.3) THEN
+ LUCOMP=130+KFLB
+ ELSEIF(KFLR.EQ.1.AND.KFLS.EQ.3) THEN
+ LUCOMP=150+KFLB
+ ELSEIF(KFLR.EQ.1.AND.KFLS.EQ.1) THEN
+ LUCOMP=170+KFLB
+ ELSEIF(KFLR.EQ.2.AND.KFLS.EQ.3) THEN
+ LUCOMP=190+KFLB
+ ELSEIF(KFLR.EQ.0.AND.KFLS.EQ.5) THEN
+ LUCOMP=210+KFLB
+ ENDIF
+ ELSEIF(KFLB.LE.5) THEN
+ IF(KFLR.EQ.0.AND.KFLS.EQ.1) THEN
+ LUCOMP=100+((KFLB-1)*(KFLB-2))/2+KFLC
+ ELSEIF(KFLR.EQ.0.AND.KFLS.EQ.3) THEN
+ LUCOMP=120+((KFLB-1)*(KFLB-2))/2+KFLC
+ ELSEIF(KFLR.EQ.1.AND.KFLS.EQ.3) THEN
+ LUCOMP=140+((KFLB-1)*(KFLB-2))/2+KFLC
+ ELSEIF(KFLR.EQ.1.AND.KFLS.EQ.1) THEN
+ LUCOMP=160+((KFLB-1)*(KFLB-2))/2+KFLC
+ ELSEIF(KFLR.EQ.2.AND.KFLS.EQ.3) THEN
+ LUCOMP=180+((KFLB-1)*(KFLB-2))/2+KFLC
+ ELSEIF(KFLR.EQ.0.AND.KFLS.EQ.5) THEN
+ LUCOMP=200+((KFLB-1)*(KFLB-2))/2+KFLC
+ ENDIF
+ ELSEIF((KFLS.EQ.1.AND.KFLR.LE.1).OR.(KFLS.EQ.3.AND.KFLR.LE.2)
+ & .OR.(KFLS.EQ.5.AND.KFLR.EQ.0)) THEN
+ LUCOMP=80+KFLB
+ ENDIF
+
+C...Diquarks.
+ ELSEIF((KFLR.EQ.0.OR.KFLR.EQ.1).AND.KFLC.EQ.0) THEN
+ IF(KFLS.NE.1.AND.KFLS.NE.3) THEN
+ ELSEIF(KFLA.EQ.9.OR.KFLB.EQ.0.OR.KFLB.EQ.9) THEN
+ ELSEIF(KFLA.LT.KFLB) THEN
+ ELSEIF(KFLS.EQ.1.AND.KFLA.EQ.KFLB) THEN
+ ELSE
+ LUCOMP=90
+ ENDIF
+
+C...Spin 1/2 baryons.
+ ELSEIF(KFLR.EQ.0.AND.KFLS.EQ.2) THEN
+ IF(KFLA.EQ.9.OR.KFLB.EQ.0.OR.KFLB.EQ.9.OR.KFLC.EQ.9) THEN
+ ELSEIF(KFLA.LE.KFLC.OR.KFLA.LT.KFLB) THEN
+ ELSEIF(KFLA.GE.6.OR.KFLB.GE.4.OR.KFLC.GE.4) THEN
+ LUCOMP=80+KFLA
+ ELSEIF(KFLB.LT.KFLC) THEN
+ LUCOMP=300+((KFLA+1)*KFLA*(KFLA-1))/6+(KFLC*(KFLC-1))/2+KFLB
+ ELSE
+ LUCOMP=330+((KFLA+1)*KFLA*(KFLA-1))/6+(KFLB*(KFLB-1))/2+KFLC
+ ENDIF
+
+C...Spin 3/2 baryons.
+ ELSEIF(KFLR.EQ.0.AND.KFLS.EQ.4) THEN
+ IF(KFLA.EQ.9.OR.KFLB.EQ.0.OR.KFLB.EQ.9.OR.KFLC.EQ.9) THEN
+ ELSEIF(KFLA.LT.KFLB.OR.KFLB.LT.KFLC) THEN
+ ELSEIF(KFLA.GE.6.OR.KFLB.GE.4) THEN
+ LUCOMP=80+KFLA
+ ELSE
+ LUCOMP=360+((KFLA+1)*KFLA*(KFLA-1))/6+(KFLB*(KFLB-1))/2+KFLC
+ ENDIF
+ ENDIF
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUERRM
+ SUBROUTINE LUERRM(MERR,CHMESS)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to inform user of errors in program execution.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ SAVE /LUJETS/,/LUDAT1/
+ CHARACTER CHMESS*(*)
+
+C...Write first few warnings, then be silent.
+ IF(MERR.LE.10) THEN
+ MSTU(27)=MSTU(27)+1
+ MSTU(28)=MERR
+ IF(MSTU(25).EQ.1.AND.MSTU(27).LE.MSTU(26)) WRITE(MSTU(11),5000)
+ & MERR,MSTU(31),CHMESS
+
+C...Write first few errors, then be silent or stop program.
+ ELSEIF(MERR.LE.20) THEN
+ MSTU(23)=MSTU(23)+1
+ MSTU(24)=MERR-10
+ IF(MSTU(21).GE.1.AND.MSTU(23).LE.MSTU(22)) WRITE(MSTU(11),5100)
+ & MERR-10,MSTU(31),CHMESS
+ IF(MSTU(21).GE.2.AND.MSTU(23).GT.MSTU(22)) THEN
+ WRITE(MSTU(11),5100) MERR-10,MSTU(31),CHMESS
+ WRITE(MSTU(11),5200)
+ IF(MERR.NE.17) CALL LULIST(2)
+ STOP
+ ENDIF
+
+C...Stop program in case of irreparable error.
+ ELSE
+ WRITE(MSTU(11),5300) MERR-20,MSTU(31),CHMESS
+ STOP
+ ENDIF
+
+C...Formats for output.
+ 5000 FORMAT(/5X,'Advisory warning type',I2,' given after',I6,
+ &' LUEXEC calls:'/5X,A)
+ 5100 FORMAT(/5X,'Error type',I2,' has occured after',I6,
+ &' LUEXEC calls:'/5X,A)
+ 5200 FORMAT(5X,'Execution will be stopped after listing of last ',
+ &'event!')
+ 5300 FORMAT(/5X,'Fatal error type',I2,' has occured after',I6,
+ &' LUEXEC calls:'/5X,A/5X,'Execution will now be stopped!')
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, ULALEM
+ FUNCTION ULALEM(Q2)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to calculate the running alpha_electromagnetic.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ SAVE /LUDAT1/
+
+C...Calculate real part of photon vacuum polarization.
+C...For leptons simplify by using asymptotic (Q^2 >> m^2) expressions.
+C...For hadrons use parametrization of H. Burkhardt et al.
+C...See R. Kleiss et al, CERN 89-08, vol. 3, pp. 129-131.
+ AEMPI=PARU(101)/(3.*PARU(1))
+ IF(MSTU(101).LE.0.OR.Q2.LT.2D-6) THEN
+ RPIGG=0.
+ ELSEIF(MSTU(101).EQ.2.AND.Q2.LT.PARU(104)) THEN
+ RPIGG=0.
+ ELSEIF(MSTU(101).EQ.2) THEN
+ RPIGG=1.-PARU(101)/PARU(103)
+ ELSEIF(Q2.LT.0.09) THEN
+ RPIGG=AEMPI*(13.4916+LOG(Q2))+0.00835*LOG(1.+Q2)
+ ELSEIF(Q2.LT.9.) THEN
+ RPIGG=AEMPI*(16.3200+2.*LOG(Q2))+0.00238*LOG(1.+3.927*Q2)
+ ELSEIF(Q2.LT.1E4) THEN
+ RPIGG=AEMPI*(13.4955+3.*LOG(Q2))+0.00165+0.00299*LOG(1.+Q2)
+ ELSE
+ RPIGG=AEMPI*(13.4955+3.*LOG(Q2))+0.00221+0.00293*LOG(1.+Q2)
+ ENDIF
+
+C...Calculate running alpha_em.
+ ULALEM=PARU(101)/(1.-RPIGG)
+ PARU(108)=ULALEM
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, ULALPS
+ FUNCTION ULALPS(Q2)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to give the value of alpha_strong.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUDAT1/,/LUDAT2/
+
+C...Constant alpha_strong trivial.
+ IF(MSTU(111).LE.0) THEN
+ ULALPS=PARU(111)
+ MSTU(118)=MSTU(112)
+ PARU(117)=0.
+ PARU(118)=PARU(111)
+ RETURN
+ ENDIF
+
+C...Find effective Q2, number of flavours and Lambda.
+ Q2EFF=Q2
+ IF(MSTU(115).GE.2) Q2EFF=MAX(Q2,PARU(114))
+ NF=MSTU(112)
+ ALAM2=PARU(112)**2
+ 100 IF(NF.GT.MAX(2,MSTU(113))) THEN
+ Q2THR=PARU(113)*PMAS(NF,1)**2
+ IF(Q2EFF.LT.Q2THR) THEN
+ NF=NF-1
+ ALAM2=ALAM2*(Q2THR/ALAM2)**(2./(33.-2.*NF))
+ GOTO 100
+ ENDIF
+ ENDIF
+ 110 IF(NF.LT.MIN(8,MSTU(114))) THEN
+ Q2THR=PARU(113)*PMAS(NF+1,1)**2
+ IF(Q2EFF.GT.Q2THR) THEN
+ NF=NF+1
+ ALAM2=ALAM2*(ALAM2/Q2THR)**(2./(33.-2.*NF))
+ GOTO 110
+ ENDIF
+ ENDIF
+ IF(MSTU(115).EQ.1) Q2EFF=Q2EFF+ALAM2
+ PARU(117)=SQRT(ALAM2)
+
+C...Evaluate first or second order alpha_strong.
+ B0=(33.-2.*NF)/6.
+ ALGQ=LOG(MAX(1.0001D0,Q2EFF/ALAM2))
+ IF(MSTU(111).EQ.1) THEN
+ ULALPS=MIN(PARU(115),PARU(2)/(B0*ALGQ))
+ ELSE
+ B1=(153.-19.*NF)/6.
+ ULALPS=MIN(PARU(115),PARU(2)/(B0*ALGQ)*(1.-B1*LOG(ALGQ)/
+ & (B0**2*ALGQ)))
+ ENDIF
+ MSTU(118)=NF
+ PARU(118)=ULALPS
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, ULANGL
+ FUNCTION ULANGL(X,Y)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to reconstruct an angle from given x and y coordinates.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ SAVE /LUDAT1/
+
+ ULANGL=0.
+ R=SQRT(X**2+Y**2)
+ IF(R.LT.1D-20) RETURN
+ IF(ABS(X)/R.LT.0.8) THEN
+ ULANGL=SIGN(ACOS(X/R),Y)
+ ELSE
+ ULANGL=ASIN(Y/R)
+ IF(X.LT.0..AND.ULANGL.GE.0.) THEN
+ ULANGL=PARU(1)-ULANGL
+ ELSEIF(X.LT.0.) THEN
+ ULANGL=-PARU(1)-ULANGL
+ ENDIF
+ ENDIF
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, RLU
+ FUNCTION RLU(IDUMMY)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to generate random numbers uniformly distributed between
+C...0 and 1, excluding the endpoints.
+ COMMON/LUDATR/MRLU(6),RRLU(100)
+ SAVE /LUDATR/
+ EQUIVALENCE (MRLU1,MRLU(1)),(MRLU2,MRLU(2)),(MRLU3,MRLU(3)),
+ &(MRLU4,MRLU(4)),(MRLU5,MRLU(5)),(MRLU6,MRLU(6)),
+ &(RRLU98,RRLU(98)),(RRLU99,RRLU(99)),(RRLU00,RRLU(100))
+
+C...Initialize generation from given seed.
+ IF(MRLU2.EQ.0) THEN
+ IJ=MOD(MRLU1/30082,31329)
+ KL=MOD(MRLU1,30082)
+ I=MOD(IJ/177,177)+2
+ J=MOD(IJ,177)+2
+ K=MOD(KL/169,178)+1
+ L=MOD(KL,169)
+ DO 110 II=1,97
+ S=0.
+ T=0.5
+ DO 100 JJ=1,24
+ M=MOD(MOD(I*J,179)*K,179)
+ I=J
+ J=K
+ K=M
+ L=MOD(53*L+1,169)
+ IF(MOD(L*M,64).GE.32) S=S+T
+ T=0.5*T
+ 100 CONTINUE
+ RRLU(II)=S
+ 110 CONTINUE
+ TWOM24=1.
+ DO 120 I24=1,24
+ TWOM24=0.5*TWOM24
+ 120 CONTINUE
+ RRLU98=362436.*TWOM24
+ RRLU99=7654321.*TWOM24
+ RRLU00=16777213.*TWOM24
+ MRLU2=1
+ MRLU3=0
+ MRLU4=97
+ MRLU5=33
+ ENDIF
+
+C...Generate next random number.
+ 130 RUNI=RRLU(MRLU4)-RRLU(MRLU5)
+ IF(RUNI.LT.0.) RUNI=RUNI+1.
+ RRLU(MRLU4)=RUNI
+ MRLU4=MRLU4-1
+ IF(MRLU4.EQ.0) MRLU4=97
+ MRLU5=MRLU5-1
+ IF(MRLU5.EQ.0) MRLU5=97
+ RRLU98=RRLU98-RRLU99
+ IF(RRLU98.LT.0.) RRLU98=RRLU98+RRLU00
+ RUNI=RUNI-RRLU98
+ IF(RUNI.LT.0.) RUNI=RUNI+1.
+ IF(RUNI.LE.0.OR.RUNI.GE.1.) GOTO 130
+
+C...Update counters. Random number to output.
+ MRLU3=MRLU3+1
+ IF(MRLU3.EQ.1000000000) THEN
+ MRLU2=MRLU2+1
+ MRLU3=0
+ ENDIF
+ RLU=RUNI
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, RLUGET
+ SUBROUTINE RLUGET(LFN,MOVE)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to dump the state of the random number generator on a file
+C...for subsequent startup from this state onwards.
+ COMMON/LUDATR/MRLU(6),RRLU(100)
+ SAVE /LUDATR/
+ CHARACTER CHERR*8
+
+C...Backspace required number of records (or as many as there are).
+ IF(MOVE.LT.0) THEN
+ NBCK=MIN(MRLU(6),-MOVE)
+ DO 100 IBCK=1,NBCK
+ BACKSPACE(LFN,ERR=110,IOSTAT=IERR)
+ 100 CONTINUE
+ MRLU(6)=MRLU(6)-NBCK
+ ENDIF
+
+C...Unformatted write on unit LFN.
+ WRITE(LFN,ERR=110,IOSTAT=IERR) (MRLU(I1),I1=1,5),
+ &(RRLU(I2),I2=1,100)
+ MRLU(6)=MRLU(6)+1
+ RETURN
+
+C...Write error.
+ 110 WRITE(CHERR,'(I8)') IERR
+ CALL LUERRM(18,'(RLUGET:) error when accessing file, IOSTAT ='//
+ &CHERR)
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, RLUSET
+ SUBROUTINE RLUSET(LFN,MOVE)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to read a state of the random number generator from a file
+C...for subsequent generation from this state onwards.
+ COMMON/LUDATR/MRLU(6),RRLU(100)
+ SAVE /LUDATR/
+ CHARACTER CHERR*8
+
+C...Backspace required number of records (or as many as there are).
+ IF(MOVE.LT.0) THEN
+ NBCK=MIN(MRLU(6),-MOVE)
+ DO 100 IBCK=1,NBCK
+ BACKSPACE(LFN,ERR=120,IOSTAT=IERR)
+ 100 CONTINUE
+ MRLU(6)=MRLU(6)-NBCK
+ ENDIF
+
+C...Unformatted read from unit LFN.
+ NFOR=1+MAX(0,MOVE)
+ DO 110 IFOR=1,NFOR
+ READ(LFN,ERR=120,IOSTAT=IERR) (MRLU(I1),I1=1,5),
+ &(RRLU(I2),I2=1,100)
+ 110 CONTINUE
+ MRLU(6)=MRLU(6)+NFOR
+ RETURN
+
+C...Write error.
+ 120 WRITE(CHERR,'(I8)') IERR
+ CALL LUERRM(18,'(RLUSET:) error when accessing file, IOSTAT ='//
+ &CHERR)
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUROBO
+ SUBROUTINE LUROBO(THE,PHI,BEX,BEY,BEZ)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to perform rotations and boosts.
+C IMPLICIT DOUBLE PRECISION(D)
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ SAVE /LUJETS/,/LUDAT1/
+ DIMENSION ROT(3,3),PR(3),VR(3),DP(4),DV(4)
+
+C...Find range of rotation/boost. Convert boost to double precision.
+ IMIN=1
+ IF(MSTU(1).GT.0) IMIN=MSTU(1)
+ IMAX=N
+ IF(MSTU(2).GT.0) IMAX=MSTU(2)
+ DBX=BEX
+ DBY=BEY
+ DBZ=BEZ
+ GOTO 120
+
+C...Entry for specific range and double precision boost.
+ ENTRY LUDBRB(IMI,IMA,THE,PHI,DBEX,DBEY,DBEZ)
+ IMIN=IMI
+ IF(IMIN.LE.0) IMIN=1
+ IMAX=IMA
+ IF(IMAX.LE.0) IMAX=N
+ DBX=DBEX
+ DBY=DBEY
+ DBZ=DBEZ
+
+C...Optional resetting of V (when not set before.)
+ IF(MSTU(33).NE.0) THEN
+ DO 110 I=MIN(IMIN,MSTU(4)),MIN(IMAX,MSTU(4))
+ DO 100 J=1,5
+ V(I,J)=0.
+ 100 CONTINUE
+ 110 CONTINUE
+ MSTU(33)=0
+ ENDIF
+
+C...Check range of rotation/boost.
+ 120 IF(IMIN.GT.MSTU(4).OR.IMAX.GT.MSTU(4)) THEN
+ CALL LUERRM(11,'(LUROBO:) range outside LUJETS memory')
+ RETURN
+ ENDIF
+
+C...Rotate, typically from z axis to direction (theta,phi).
+ IF(THE**2+PHI**2.GT.1D-20) THEN
+ ROT(1,1)=COS(THE)*COS(PHI)
+ ROT(1,2)=-SIN(PHI)
+ ROT(1,3)=SIN(THE)*COS(PHI)
+ ROT(2,1)=COS(THE)*SIN(PHI)
+ ROT(2,2)=COS(PHI)
+ ROT(2,3)=SIN(THE)*SIN(PHI)
+ ROT(3,1)=-SIN(THE)
+ ROT(3,2)=0.
+ ROT(3,3)=COS(THE)
+ DO 150 I=IMIN,IMAX
+ IF(K(I,1).LE.0) GOTO 150
+ DO 130 J=1,3
+ PR(J)=P(I,J)
+ VR(J)=V(I,J)
+ 130 CONTINUE
+ DO 140 J=1,3
+ P(I,J)=ROT(J,1)*PR(1)+ROT(J,2)*PR(2)+ROT(J,3)*PR(3)
+ V(I,J)=ROT(J,1)*VR(1)+ROT(J,2)*VR(2)+ROT(J,3)*VR(3)
+ 140 CONTINUE
+ 150 CONTINUE
+ ENDIF
+
+C...Boost, typically from rest to momentum/energy=beta.
+ IF(DBX**2+DBY**2+DBZ**2.GT.1D-20) THEN
+ DB=SQRT(DBX**2+DBY**2+DBZ**2)
+ IF(DB.GT.0.99999999D0) THEN
+C...Rescale boost vector if too close to unity.
+ CALL LUERRM(3,'(LUROBO:) boost vector too large')
+ DBX=DBX*(0.99999999D0/DB)
+ DBY=DBY*(0.99999999D0/DB)
+ DBZ=DBZ*(0.99999999D0/DB)
+ DB=0.99999999D0
+ ENDIF
+ DGA=1D0/SQRT(1D0-DB**2)
+ DO 170 I=IMIN,IMAX
+ IF(K(I,1).LE.0) GOTO 170
+ DO 160 J=1,4
+ DP(J)=P(I,J)
+ DV(J)=V(I,J)
+ 160 CONTINUE
+ DBP=DBX*DP(1)+DBY*DP(2)+DBZ*DP(3)
+ DGABP=DGA*(DGA*DBP/(1D0+DGA)+DP(4))
+ P(I,1)=DP(1)+DGABP*DBX
+ P(I,2)=DP(2)+DGABP*DBY
+ P(I,3)=DP(3)+DGABP*DBZ
+ P(I,4)=DGA*(DP(4)+DBP)
+ DBV=DBX*DV(1)+DBY*DV(2)+DBZ*DV(3)
+ DGABV=DGA*(DGA*DBV/(1D0+DGA)+DV(4))
+ V(I,1)=DV(1)+DGABV*DBX
+ V(I,2)=DV(2)+DGABV*DBY
+ V(I,3)=DV(3)+DGABV*DBZ
+ V(I,4)=DGA*(DV(4)+DBV)
+ 170 CONTINUE
+ ENDIF
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUEDIT
+ SUBROUTINE LUEDIT(MEDIT)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to perform global manipulations on the event record,
+C...in particular to exclude unstable or undetectable partons/particles.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+ DIMENSION NS(2),PTS(2),PLS(2)
+
+C...Remove unwanted partons/particles.
+ IF((MEDIT.GE.0.AND.MEDIT.LE.3).OR.MEDIT.EQ.5) THEN
+ IMAX=N
+ IF(MSTU(2).GT.0) IMAX=MSTU(2)
+ I1=MAX(1,MSTU(1))-1
+ DO 110 I=MAX(1,MSTU(1)),IMAX
+ IF(K(I,1).EQ.0.OR.K(I,1).GT.20) GOTO 110
+ IF(MEDIT.EQ.1) THEN
+ IF(K(I,1).GT.10) GOTO 110
+ ELSEIF(MEDIT.EQ.2) THEN
+ IF(K(I,1).GT.10) GOTO 110
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR.KC.EQ.18)
+ & GOTO 110
+ ELSEIF(MEDIT.EQ.3) THEN
+ IF(K(I,1).GT.10) GOTO 110
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0) GOTO 110
+ IF(KCHG(KC,2).EQ.0.AND.LUCHGE(K(I,2)).EQ.0) GOTO 110
+ ELSEIF(MEDIT.EQ.5) THEN
+ IF(K(I,1).EQ.13.OR.K(I,1).EQ.14) GOTO 110
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0) GOTO 110
+ IF(K(I,1).GE.11.AND.KCHG(KC,2).EQ.0) GOTO 110
+ ENDIF
+
+C...Pack remaining partons/particles. Origin no longer known.
+ I1=I1+1
+ DO 100 J=1,5
+ K(I1,J)=K(I,J)
+ P(I1,J)=P(I,J)
+ V(I1,J)=V(I,J)
+ 100 CONTINUE
+ K(I1,3)=0
+ 110 CONTINUE
+ IF(I1.LT.N) MSTU(3)=0
+ IF(I1.LT.N) MSTU(70)=0
+ N=I1
+
+C...Selective removal of class of entries. New position of retained.
+ ELSEIF(MEDIT.GE.11.AND.MEDIT.LE.15) THEN
+ I1=0
+ DO 120 I=1,N
+ K(I,3)=MOD(K(I,3),MSTU(5))
+ IF(MEDIT.EQ.11.AND.K(I,1).LT.0) GOTO 120
+ IF(MEDIT.EQ.12.AND.K(I,1).EQ.0) GOTO 120
+ IF(MEDIT.EQ.13.AND.(K(I,1).EQ.11.OR.K(I,1).EQ.12.OR.
+ & K(I,1).EQ.15).AND.K(I,2).NE.94) GOTO 120
+ IF(MEDIT.EQ.14.AND.(K(I,1).EQ.13.OR.K(I,1).EQ.14.OR.
+ & K(I,2).EQ.94)) GOTO 120
+ IF(MEDIT.EQ.15.AND.K(I,1).GE.21) GOTO 120
+ I1=I1+1
+ K(I,3)=K(I,3)+MSTU(5)*I1
+ 120 CONTINUE
+
+C...Find new event history information and replace old.
+ DO 140 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.20.OR.K(I,3)/MSTU(5).EQ.0) GOTO 140
+ ID=I
+ 130 IM=MOD(K(ID,3),MSTU(5))
+ IF(MEDIT.EQ.13.AND.IM.GT.0.AND.IM.LE.N) THEN
+ IF((K(IM,1).EQ.11.OR.K(IM,1).EQ.12.OR.K(IM,1).EQ.15).AND.
+ & K(IM,2).NE.94) THEN
+ ID=IM
+ GOTO 130
+ ENDIF
+ ELSEIF(MEDIT.EQ.14.AND.IM.GT.0.AND.IM.LE.N) THEN
+ IF(K(IM,1).EQ.13.OR.K(IM,1).EQ.14.OR.K(IM,2).EQ.94) THEN
+ ID=IM
+ GOTO 130
+ ENDIF
+ ENDIF
+ K(I,3)=MSTU(5)*(K(I,3)/MSTU(5))
+ IF(IM.NE.0) K(I,3)=K(I,3)+K(IM,3)/MSTU(5)
+ IF(K(I,1).NE.3.AND.K(I,1).NE.13.AND.K(I,1).NE.14) THEN
+ IF(K(I,4).GT.0.AND.K(I,4).LE.MSTU(4)) K(I,4)=
+ & K(K(I,4),3)/MSTU(5)
+ IF(K(I,5).GT.0.AND.K(I,5).LE.MSTU(4)) K(I,5)=
+ & K(K(I,5),3)/MSTU(5)
+ ELSE
+ KCM=MOD(K(I,4)/MSTU(5),MSTU(5))
+ IF(KCM.GT.0.AND.KCM.LE.MSTU(4)) KCM=K(KCM,3)/MSTU(5)
+ KCD=MOD(K(I,4),MSTU(5))
+ IF(KCD.GT.0.AND.KCD.LE.MSTU(4)) KCD=K(KCD,3)/MSTU(5)
+ K(I,4)=MSTU(5)**2*(K(I,4)/MSTU(5)**2)+MSTU(5)*KCM+KCD
+ KCM=MOD(K(I,5)/MSTU(5),MSTU(5))
+ IF(KCM.GT.0.AND.KCM.LE.MSTU(4)) KCM=K(KCM,3)/MSTU(5)
+ KCD=MOD(K(I,5),MSTU(5))
+ IF(KCD.GT.0.AND.KCD.LE.MSTU(4)) KCD=K(KCD,3)/MSTU(5)
+ K(I,5)=MSTU(5)**2*(K(I,5)/MSTU(5)**2)+MSTU(5)*KCM+KCD
+ ENDIF
+ 140 CONTINUE
+
+C...Pack remaining entries.
+ I1=0
+ MSTU90=MSTU(90)
+ MSTU(90)=0
+ DO 170 I=1,N
+ IF(K(I,3)/MSTU(5).EQ.0) GOTO 170
+ I1=I1+1
+ DO 150 J=1,5
+ K(I1,J)=K(I,J)
+ P(I1,J)=P(I,J)
+ V(I1,J)=V(I,J)
+ 150 CONTINUE
+ K(I1,3)=MOD(K(I1,3),MSTU(5))
+ DO 160 IZ=1,MSTU90
+ IF(I.EQ.MSTU(90+IZ)) THEN
+ MSTU(90)=MSTU(90)+1
+ MSTU(90+MSTU(90))=I1
+ PARU(90+MSTU(90))=PARU(90+IZ)
+ ENDIF
+ 160 CONTINUE
+ 170 CONTINUE
+ IF(I1.LT.N) MSTU(3)=0
+ IF(I1.LT.N) MSTU(70)=0
+ N=I1
+
+C...Fill in some missing daughter pointers (lost in colour flow).
+ ELSEIF(MEDIT.EQ.16) THEN
+ DO 190 I=1,N
+ IF(K(I,1).LE.10.OR.K(I,1).GT.20) GOTO 190
+ IF(K(I,4).NE.0.OR.K(I,5).NE.0) GOTO 190
+C...Find daughters who point to mother.
+ DO 180 I1=I+1,N
+ IF(K(I1,3).NE.I) THEN
+ ELSEIF(K(I,4).EQ.0) THEN
+ K(I,4)=I1
+ ELSE
+ K(I,5)=I1
+ ENDIF
+ 180 CONTINUE
+ IF(K(I,5).EQ.0) K(I,5)=K(I,4)
+ IF(K(I,4).NE.0) GOTO 190
+C...Find daughters who point to documentation version of mother.
+ IM=K(I,3)
+ IF(IM.LE.0.OR.IM.GE.I) GOTO 190
+ IF(K(IM,1).LE.20.OR.K(IM,1).GT.30) GOTO 190
+ IF(K(IM,2).NE.K(I,2).OR.ABS(P(IM,5)-P(I,5)).GT.1D-2) GOTO 190
+ DO 182 I1=I+1,N
+ IF(K(I1,3).NE.IM) THEN
+ ELSEIF(K(I,4).EQ.0) THEN
+ K(I,4)=I1
+ ELSE
+ K(I,5)=I1
+ ENDIF
+ 182 CONTINUE
+ IF(K(I,5).EQ.0) K(I,5)=K(I,4)
+ IF(K(I,4).NE.0) GOTO 190
+C...Find daughters who point to documentation daughters who,
+C...in their turn, point to documentation mother.
+ ID1=IM
+ ID2=IM
+ DO 184 I1=IM+1,I-1
+ IF(K(I1,3).EQ.IM.AND.K(I1,1).GT.20.AND.K(I1,1).LE.30) THEN
+ ID2=I1
+ IF(ID1.EQ.IM) ID1=I1
+ ENDIF
+ 184 CONTINUE
+ DO 186 I1=I+1,N
+ IF(K(I1,3).NE.ID1.AND.K(I1,3).NE.ID2) THEN
+ ELSEIF(K(I,4).EQ.0) THEN
+ K(I,4)=I1
+ ELSE
+ K(I,5)=I1
+ ENDIF
+ 186 CONTINUE
+ IF(K(I,5).EQ.0) K(I,5)=K(I,4)
+ 190 CONTINUE
+
+C...Save top entries at bottom of LUJETS commonblock.
+ ELSEIF(MEDIT.EQ.21) THEN
+ IF(2*N.GE.MSTU(4)) THEN
+ CALL LUERRM(11,'(LUEDIT:) no more memory left in LUJETS')
+ RETURN
+ ENDIF
+ DO 210 I=1,N
+ DO 200 J=1,5
+ K(MSTU(4)-I,J)=K(I,J)
+ P(MSTU(4)-I,J)=P(I,J)
+ V(MSTU(4)-I,J)=V(I,J)
+ 200 CONTINUE
+ 210 CONTINUE
+ MSTU(32)=N
+
+C...Restore bottom entries of commonblock LUJETS to top.
+ ELSEIF(MEDIT.EQ.22) THEN
+ DO 230 I=1,MSTU(32)
+ DO 220 J=1,5
+ K(I,J)=K(MSTU(4)-I,J)
+ P(I,J)=P(MSTU(4)-I,J)
+ V(I,J)=V(MSTU(4)-I,J)
+ 220 CONTINUE
+ 230 CONTINUE
+ N=MSTU(32)
+
+C...Mark primary entries at top of commonblock LUJETS as untreated.
+ ELSEIF(MEDIT.EQ.23) THEN
+ I1=0
+ DO 240 I=1,N
+ KH=K(I,3)
+ IF(KH.GE.1) THEN
+ IF(K(KH,1).GT.20) KH=0
+ ENDIF
+ IF(KH.NE.0) GOTO 250
+ I1=I1+1
+ IF(K(I,1).GT.10.AND.K(I,1).LE.20) K(I,1)=K(I,1)-10
+ 240 CONTINUE
+ 250 N=I1
+
+C...Place largest axis along z axis and second largest in xy plane.
+ ELSEIF(MEDIT.EQ.31.OR.MEDIT.EQ.32) THEN
+ CALL LUDBRB(1,N+MSTU(3),0.D0,-ULANGL(P(MSTU(61),1),
+ & P(MSTU(61),2)),0D0,0D0,0D0)
+ CALL LUDBRB(1,N+MSTU(3),-ULANGL(P(MSTU(61),3),
+ & P(MSTU(61),1)),0.D0,0D0,0D0,0D0)
+ CALL LUDBRB(1,N+MSTU(3),0.D0,-ULANGL(P(MSTU(61)+1,1),
+ & P(MSTU(61)+1,2)),0D0,0D0,0D0)
+ IF(MEDIT.EQ.31) RETURN
+
+C...Rotate to put slim jet along +z axis.
+ DO 260 IS=1,2
+ NS(IS)=0
+ PTS(IS)=0.
+ PLS(IS)=0.
+ 260 CONTINUE
+ DO 270 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 270
+ IF(MSTU(41).GE.2) THEN
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR.
+ & KC.EQ.18) GOTO 270
+ IF(MSTU(41).GE.3.AND.KCHG(KC,2).EQ.0.AND.LUCHGE(K(I,2)).EQ.0)
+ & GOTO 270
+ ENDIF
+ IS=2.-SIGN(0.5D0,P(I,3))
+ NS(IS)=NS(IS)+1
+ PTS(IS)=PTS(IS)+SQRT(P(I,1)**2+P(I,2)**2)
+ 270 CONTINUE
+ IF(NS(1)*PTS(2)**2.LT.NS(2)*PTS(1)**2)
+ & CALL LUDBRB(1,N+MSTU(3),PARU(1),0.D0,0D0,0D0,0D0)
+
+C...Rotate to put second largest jet into -z,+x quadrant.
+ DO 280 I=1,N
+ IF(P(I,3).GE.0.) GOTO 280
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 280
+ IF(MSTU(41).GE.2) THEN
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR.
+ & KC.EQ.18) GOTO 280
+ IF(MSTU(41).GE.3.AND.KCHG(KC,2).EQ.0.AND.LUCHGE(K(I,2)).EQ.0)
+ & GOTO 280
+ ENDIF
+ IS=2.-SIGN(0.5D0,P(I,1))
+ PLS(IS)=PLS(IS)-P(I,3)
+ 280 CONTINUE
+ IF(PLS(2).GT.PLS(1)) CALL LUDBRB(1,N+MSTU(3),0.D0,PARU(1),
+ & 0D0,0D0,0D0)
+ ENDIF
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LULIST
+ SUBROUTINE LULIST(MLIST)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to give program heading, or list an event, or particle
+C...data, or current parameter values.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/,/LUDAT3/
+ CHARACTER CHAP*16,CHAC*16,CHAN*16,CHAD(5)*16,CHDL(7)*4
+ DIMENSION PS(6)
+ DATA CHDL/'(())',' ','()','!!','<>','==','(==)'/
+
+C...Initialization printout: version number and date of last change.
+ IF(MLIST.EQ.0.OR.MSTU(12).EQ.1) THEN
+ CALL LULOGO
+ MSTU(12)=0
+ IF(MLIST.EQ.0) RETURN
+ ENDIF
+
+C...List event data, including additional lines after N.
+ IF(MLIST.GE.1.AND.MLIST.LE.3) THEN
+ IF(MLIST.EQ.1) WRITE(MSTU(11),5100)
+ IF(MLIST.EQ.2) WRITE(MSTU(11),5200)
+ IF(MLIST.EQ.3) WRITE(MSTU(11),5300)
+ LMX=12
+ IF(MLIST.GE.2) LMX=16
+ ISTR=0
+ IMAX=N
+ IF(MSTU(2).GT.0) IMAX=MSTU(2)
+ DO 120 I=MAX(1,MSTU(1)),MAX(IMAX,N+MAX(0,MSTU(3)))
+ IF((I.GT.IMAX.AND.I.LE.N).OR.K(I,1).LT.0) GOTO 120
+
+C...Get particle name, pad it and check it is not too long.
+ CALL LUNAME(K(I,2),CHAP)
+ LEN=0
+ DO 100 LEM=1,16
+ IF(CHAP(LEM:LEM).NE.' ') LEN=LEM
+ 100 CONTINUE
+ MDL=(K(I,1)+19)/10
+ LDL=0
+ IF(MDL.EQ.2.OR.MDL.GE.8) THEN
+ CHAC=CHAP
+ IF(LEN.GT.LMX) CHAC(LMX:LMX)='?'
+ ELSE
+ LDL=1
+ IF(MDL.EQ.1.OR.MDL.EQ.7) LDL=2
+ IF(LEN.EQ.0) THEN
+ CHAC=CHDL(MDL)(1:2*LDL)//' '
+ ELSE
+ CHAC=CHDL(MDL)(1:LDL)//CHAP(1:MIN(LEN,LMX-2*LDL))//
+ & CHDL(MDL)(LDL+1:2*LDL)//' '
+ IF(LEN+2*LDL.GT.LMX) CHAC(LMX:LMX)='?'
+ ENDIF
+ ENDIF
+
+C...Add information on string connection.
+ IF(K(I,1).EQ.1.OR.K(I,1).EQ.2.OR.K(I,1).EQ.11.OR.K(I,1).EQ.12)
+ & THEN
+ KC=LUCOMP(K(I,2))
+ KCC=0
+ IF(KC.NE.0) KCC=KCHG(KC,2)
+ IF(IABS(K(I,2)).EQ.39) THEN
+ IF(LEN+2*LDL+3.LE.LMX) CHAC(LMX-1:LMX-1)='X'
+ ELSEIF(KCC.NE.0.AND.ISTR.EQ.0) THEN
+ ISTR=1
+ IF(LEN+2*LDL+3.LE.LMX) CHAC(LMX-1:LMX-1)='A'
+ ELSEIF(KCC.NE.0.AND.(K(I,1).EQ.2.OR.K(I,1).EQ.12)) THEN
+ IF(LEN+2*LDL+3.LE.LMX) CHAC(LMX-1:LMX-1)='I'
+ ELSEIF(KCC.NE.0) THEN
+ ISTR=0
+ IF(LEN+2*LDL+3.LE.LMX) CHAC(LMX-1:LMX-1)='V'
+ ENDIF
+ ENDIF
+
+C...Write data for particle/jet.
+ IF(MLIST.EQ.1.AND.ABS(P(I,4)).LT.9999.) THEN
+ WRITE(MSTU(11),5400) I,CHAC(1:12),(K(I,J1),J1=1,3),
+ & (P(I,J2),J2=1,5)
+ ELSEIF(MLIST.EQ.1.AND.ABS(P(I,4)).LT.99999.) THEN
+ WRITE(MSTU(11),5500) I,CHAC(1:12),(K(I,J1),J1=1,3),
+ & (P(I,J2),J2=1,5)
+ ELSEIF(MLIST.EQ.1) THEN
+ WRITE(MSTU(11),5600) I,CHAC(1:12),(K(I,J1),J1=1,3),
+ & (P(I,J2),J2=1,5)
+ ELSEIF(MSTU(5).EQ.10000.AND.(K(I,1).EQ.3.OR.K(I,1).EQ.13.OR.
+ & K(I,1).EQ.14)) THEN
+ WRITE(MSTU(11),5700) I,CHAC,(K(I,J1),J1=1,3),
+ & K(I,4)/100000000,MOD(K(I,4)/10000,10000),MOD(K(I,4),10000),
+ & K(I,5)/100000000,MOD(K(I,5)/10000,10000),MOD(K(I,5),10000),
+ & (P(I,J2),J2=1,5)
+ ELSE
+ WRITE(MSTU(11),5800) I,CHAC,(K(I,J1),J1=1,5),(P(I,J2),J2=1,5)
+ ENDIF
+ IF(MLIST.EQ.3) WRITE(MSTU(11),5900) (V(I,J),J=1,5)
+
+C...Insert extra separator lines specified by user.
+ IF(MSTU(70).GE.1) THEN
+ ISEP=0
+ DO 110 J=1,MIN(10,MSTU(70))
+ IF(I.EQ.MSTU(70+J)) ISEP=1
+ 110 CONTINUE
+ IF(ISEP.EQ.1.AND.MLIST.EQ.1) WRITE(MSTU(11),6000)
+ IF(ISEP.EQ.1.AND.MLIST.GE.2) WRITE(MSTU(11),6100)
+ ENDIF
+ 120 CONTINUE
+
+C...Sum of charges and momenta.
+ DO 130 J=1,6
+ PS(J)=PLU(0,J)
+ 130 CONTINUE
+ IF(MLIST.EQ.1.AND.ABS(PS(4)).LT.9999.) THEN
+ WRITE(MSTU(11),6200) PS(6),(PS(J),J=1,5)
+ ELSEIF(MLIST.EQ.1.AND.ABS(PS(4)).LT.99999.) THEN
+ WRITE(MSTU(11),6300) PS(6),(PS(J),J=1,5)
+ ELSEIF(MLIST.EQ.1) THEN
+ WRITE(MSTU(11),6400) PS(6),(PS(J),J=1,5)
+ ELSE
+ WRITE(MSTU(11),6500) PS(6),(PS(J),J=1,5)
+ ENDIF
+
+C...Give simple list of KF codes defined in program.
+ ELSEIF(MLIST.EQ.11) THEN
+ WRITE(MSTU(11),6600)
+ DO 140 KF=1,40
+ CALL LUNAME(KF,CHAP)
+ CALL LUNAME(-KF,CHAN)
+ IF(CHAP.NE.' '.AND.CHAN.EQ.' ') WRITE(MSTU(11),6700) KF,CHAP
+ IF(CHAN.NE.' ') WRITE(MSTU(11),6700) KF,CHAP,-KF,CHAN
+ 140 CONTINUE
+ DO 170 KFLS=1,3,2
+ DO 160 KFLA=1,8
+ DO 150 KFLB=1,KFLA-(3-KFLS)/2
+ KF=1000*KFLA+100*KFLB+KFLS
+ CALL LUNAME(KF,CHAP)
+ CALL LUNAME(-KF,CHAN)
+ WRITE(MSTU(11),6700) KF,CHAP,-KF,CHAN
+ 150 CONTINUE
+ 160 CONTINUE
+ 170 CONTINUE
+ KF=130
+ CALL LUNAME(KF,CHAP)
+ WRITE(MSTU(11),6700) KF,CHAP
+ KF=310
+ CALL LUNAME(KF,CHAP)
+ WRITE(MSTU(11),6700) KF,CHAP
+ DO 200 KMUL=0,5
+ KFLS=3
+ IF(KMUL.EQ.0.OR.KMUL.EQ.3) KFLS=1
+ IF(KMUL.EQ.5) KFLS=5
+ KFLR=0
+ IF(KMUL.EQ.2.OR.KMUL.EQ.3) KFLR=1
+ IF(KMUL.EQ.4) KFLR=2
+ DO 190 KFLB=1,8
+ DO 180 KFLC=1,KFLB-1
+ KF=10000*KFLR+100*KFLB+10*KFLC+KFLS
+ CALL LUNAME(KF,CHAP)
+ CALL LUNAME(-KF,CHAN)
+ WRITE(MSTU(11),6700) KF,CHAP,-KF,CHAN
+ 180 CONTINUE
+ KF=10000*KFLR+110*KFLB+KFLS
+ CALL LUNAME(KF,CHAP)
+ WRITE(MSTU(11),6700) KF,CHAP
+ 190 CONTINUE
+ 200 CONTINUE
+ KF=30443
+ CALL LUNAME(KF,CHAP)
+ WRITE(MSTU(11),6700) KF,CHAP
+ KF=30553
+ CALL LUNAME(KF,CHAP)
+ WRITE(MSTU(11),6700) KF,CHAP
+ DO 240 KFLSP=1,3
+ KFLS=2+2*(KFLSP/3)
+ DO 230 KFLA=1,8
+ DO 220 KFLB=1,KFLA
+ DO 210 KFLC=1,KFLB
+ IF(KFLSP.EQ.1.AND.(KFLA.EQ.KFLB.OR.KFLB.EQ.KFLC)) GOTO 210
+ IF(KFLSP.EQ.2.AND.KFLA.EQ.KFLC) GOTO 210
+ IF(KFLSP.EQ.1) KF=1000*KFLA+100*KFLC+10*KFLB+KFLS
+ IF(KFLSP.GE.2) KF=1000*KFLA+100*KFLB+10*KFLC+KFLS
+ CALL LUNAME(KF,CHAP)
+ CALL LUNAME(-KF,CHAN)
+ WRITE(MSTU(11),6700) KF,CHAP,-KF,CHAN
+ 210 CONTINUE
+ 220 CONTINUE
+ 230 CONTINUE
+ 240 CONTINUE
+
+C...List parton/particle data table. Check whether to be listed.
+ ELSEIF(MLIST.EQ.12) THEN
+ WRITE(MSTU(11),6800)
+ MSTJ24=MSTJ(24)
+ MSTJ(24)=0
+ KFMAX=30553
+ IF(MSTU(2).NE.0) KFMAX=MSTU(2)
+ DO 270 KF=MAX(1,MSTU(1)),KFMAX
+ KC=LUCOMP(KF)
+ IF(KC.EQ.0) GOTO 270
+ IF(MSTU(14).EQ.0.AND.KF.GT.100.AND.KC.LE.100) GOTO 270
+ IF(MSTU(14).GT.0.AND.KF.GT.100.AND.MAX(MOD(KF/1000,10),
+ & MOD(KF/100,10)).GT.MSTU(14)) GOTO 270
+ IF(MSTU(14).GT.0.AND.KF.GT.100.AND.KC.EQ.90) GOTO 270
+
+C...Find particle name and mass. Print information.
+ CALL LUNAME(KF,CHAP)
+ IF(KF.LE.100.AND.CHAP.EQ.' '.AND.MDCY(KC,2).EQ.0) GOTO 270
+ CALL LUNAME(-KF,CHAN)
+ PM=ULMASS(KF)
+ WRITE(MSTU(11),6900) KF,KC,CHAP,CHAN,KCHG(KC,1),KCHG(KC,2),
+ & KCHG(KC,3),PM,PMAS(KC,2),PMAS(KC,3),PMAS(KC,4),MDCY(KC,1)
+
+C...Particle decay: channel number, branching ration, matrix element,
+C...decay products.
+ IF(KF.GT.100.AND.KC.LE.100) GOTO 270
+ DO 260 IDC=MDCY(KC,2),MDCY(KC,2)+MDCY(KC,3)-1
+ DO 250 J=1,5
+ CALL LUNAME(KFDP(IDC,J),CHAD(J))
+ 250 CONTINUE
+ WRITE(MSTU(11),7000) IDC,MDME(IDC,1),MDME(IDC,2),BRAT(IDC),
+ & (CHAD(J),J=1,5)
+ 260 CONTINUE
+ 270 CONTINUE
+ MSTJ(24)=MSTJ24
+
+C...List parameter value table.
+ ELSEIF(MLIST.EQ.13) THEN
+ WRITE(MSTU(11),7100)
+ DO 280 I=1,200
+ WRITE(MSTU(11),7200) I,MSTU(I),PARU(I),MSTJ(I),PARJ(I),PARF(I)
+ 280 CONTINUE
+ ENDIF
+
+C...Format statements for output on unit MSTU(11) (by default 6).
+ 5100 FORMAT(///28X,'Event listing (summary)'//4X,'I particle/jet KS',
+ &5X,'KF orig p_x p_y p_z E m'/)
+ 5200 FORMAT(///28X,'Event listing (standard)'//4X,'I particle/jet',
+ &' K(I,1) K(I,2) K(I,3) K(I,4) K(I,5) P(I,1)',
+ &' P(I,2) P(I,3) P(I,4) P(I,5)'/)
+ 5300 FORMAT(///28X,'Event listing (with vertices)'//4X,'I particle/j',
+ &'et K(I,1) K(I,2) K(I,3) K(I,4) K(I,5) P(I,1)',
+ &' P(I,2) P(I,3) P(I,4) P(I,5)'/73X,
+ &'V(I,1) V(I,2) V(I,3) V(I,4) V(I,5)'/)
+ 5400 FORMAT(1X,I4,2X,A12,1X,I2,1X,I6,1X,I4,5F9.3)
+ 5500 FORMAT(1X,I4,2X,A12,1X,I2,1X,I6,1X,I4,5F9.2)
+ 5600 FORMAT(1X,I4,2X,A12,1X,I2,1X,I6,1X,I4,5F9.1)
+ 5700 FORMAT(1X,I4,2X,A16,1X,I3,1X,I8,2X,I4,2(3X,I1,2I4),5F13.5)
+ 5800 FORMAT(1X,I4,2X,A16,1X,I3,1X,I8,2X,I4,2(3X,I9),5F13.5)
+ 5900 FORMAT(66X,5(1X,F12.3))
+ 6000 FORMAT(1X,78('='))
+ 6100 FORMAT(1X,130('='))
+ 6200 FORMAT(19X,'sum:',F6.2,5X,5F9.3)
+ 6300 FORMAT(19X,'sum:',F6.2,5X,5F9.2)
+ 6400 FORMAT(19X,'sum:',F6.2,5X,5F9.1)
+ 6500 FORMAT(19X,'sum charge:',F6.2,3X,'sum momentum and inv. mass:',
+ &5F13.5)
+ 6600 FORMAT(///20X,'List of KF codes in program'/)
+ 6700 FORMAT(4X,I6,4X,A16,6X,I6,4X,A16)
+ 6800 FORMAT(///30X,'Particle/parton data table'//5X,'KF',5X,'KC',4X,
+ &'particle',8X,'antiparticle',6X,'chg col anti',8X,'mass',7X,
+ &'width',7X,'w-cut',5X,'lifetime',1X,'decay'/11X,'IDC',1X,'on/off',
+ &1X,'ME',3X,'Br.rat.',4X,'decay products')
+ 6900 FORMAT(/1X,I6,3X,I4,4X,A16,A16,3I5,1X,F12.5,2(1X,F11.5),
+ &2X,F12.5,3X,I2)
+ 7000 FORMAT(10X,I4,2X,I3,2X,I3,2X,F8.5,4X,5A16)
+ 7100 FORMAT(///20X,'Parameter value table'//4X,'I',3X,'MSTU(I)',
+ &8X,'PARU(I)',3X,'MSTJ(I)',8X,'PARJ(I)',8X,'PARF(I)')
+ 7200 FORMAT(1X,I4,1X,I9,1X,F14.5,1X,I9,1X,F14.5,1X,F14.5)
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LULOGO
+ SUBROUTINE LULOGO
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to write logo for JETSET and PYTHIA programs.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/PYPARS/MSTP(200),PARP(200),MSTI(200),PARI(200)
+ SAVE /LUDAT1/
+ SAVE /PYPARS/
+ CHARACTER MONTH(12)*3, LOGO(48)*32, REFER(22)*36, LINE*79,
+ &VERS*1, SUBV*3, DATE*2, YEAR*4
+
+C...Data on months, logo, titles, and references.
+ DATA MONTH/'Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep',
+ &'Oct','Nov','Dec'/
+ DATA (LOGO(J),J=1,10)/
+ &'PPP Y Y TTTTT H H III A ',
+ &'P P Y Y T H H I A A ',
+ &'PPP Y T HHHHH I AAAAA',
+ &'P Y T H H I A A',
+ &'P Y T H H III A A',
+ &'JJJJ EEEE TTTTT SSS EEEE TTTTT',
+ &' J E T S E T ',
+ &' J EEE T SSS EEE T ',
+ &'J J E T S E T ',
+ &' JJ EEEE T SSS EEEE T '/
+ DATA (LOGO(J),J=11,29)/
+ &' *......* ',
+ &' *:::!!:::::::::::* ',
+ &' *::::::!!::::::::::::::* ',
+ &' *::::::::!!::::::::::::::::* ',
+ &' *:::::::::!!:::::::::::::::::* ',
+ &' *:::::::::!!:::::::::::::::::* ',
+ &' *::::::::!!::::::::::::::::*! ',
+ &' *::::::!!::::::::::::::* !! ',
+ &' !! *:::!!:::::::::::* !! ',
+ &' !! !* -><- * !! ',
+ &' !! !! !! ',
+ &' !! !! !! ',
+ &' !! !! ',
+ &' !! ep !! ',
+ &' !! !! ',
+ &' !! pp !! ',
+ &' !! e+e- !! ',
+ &' !! !! ',
+ &' !! '/
+ DATA (LOGO(J),J=30,48)/
+ &'Welcome to the Lund Monte Carlo!',
+ &' ',
+ &' This is PYTHIA version x.xxx ',
+ &'Last date of change: xx xxx 199x',
+ &' ',
+ &' This is JETSET version x.xxx ',
+ &'Last date of change: xx xxx 199x',
+ &' ',
+ &' Main author: ',
+ &' Torbjorn Sjostrand ',
+ &' Dept. of theoretical physics 2 ',
+ &' University of Lund ',
+ &' Solvegatan 14A ',
+ &' S-223 62 Lund, Sweden ',
+ &' phone: +46 - 46 - 222 48 16 ',
+ &' E-mail: torbjorn@thep.lu.se ',
+ &' ',
+ &' Copyright Torbjorn Sjostrand ',
+ &' and CERN, Geneva 1993 '/
+ DATA (REFER(J),J=1,6)/
+ &'The latest program versions and docu',
+ &'mentation is found on WWW address ',
+ &'http://thep.lu.se/tf2/staff/torbjorn',
+ &'/Welcome.html ',
+ &' ',
+ &' '/
+ DATA (REFER(J),J=7,22)/
+ &'When you cite these programs, priori',
+ &'ty should always be given to the ',
+ &'latest published description. Curren',
+ &'tly this is ',
+ &'T. Sjostrand, Computer Physics Commu',
+ &'n. 82 (1994) 74. ',
+ &'The most recent long description (un',
+ &'published) is ',
+ &'T. Sjostrand, LU TP 95-20 and CERN-T',
+ &'H.7112/93 (revised August 1995). ',
+ &'Also remember that the programs, to ',
+ &'a large extent, represent original ',
+ &'physics research. Other publications',
+ &' of special relevance to your ',
+ &'studies may therefore deserve separa',
+ &'te mention. '/
+
+C...Check if PYTHIA linked.
+ IF(MSTP(183)/10.NE.199) THEN
+ LOGO(32)=' Warning: PYTHIA is not loaded! '
+ LOGO(33)='Did you remember to link PYDATA?'
+ ELSE
+ WRITE(VERS,'(I1)') MSTP(181)
+ LOGO(32)(26:26)=VERS
+ WRITE(SUBV,'(I3)') MSTP(182)
+ LOGO(32)(28:30)=SUBV
+ WRITE(DATE,'(I2)') MSTP(185)
+ LOGO(33)(22:23)=DATE
+ LOGO(33)(25:27)=MONTH(MSTP(184))
+ WRITE(YEAR,'(I4)') MSTP(183)
+ LOGO(33)(29:32)=YEAR
+ ENDIF
+
+C...Check if JETSET linked.
+ IF(MSTU(183)/10.NE.199) THEN
+ LOGO(35)=' Error: JETSET is not loaded! '
+ LOGO(36)='Did you remember to link LUDATA?'
+ ELSE
+ WRITE(VERS,'(I1)') MSTU(181)
+ LOGO(35)(26:26)=VERS
+ WRITE(SUBV,'(I3)') MSTU(182)
+ LOGO(35)(28:30)=SUBV
+ WRITE(DATE,'(I2)') MSTU(185)
+ LOGO(36)(22:23)=DATE
+ LOGO(36)(25:27)=MONTH(MSTU(184))
+ WRITE(YEAR,'(I4)') MSTU(183)
+ LOGO(36)(29:32)=YEAR
+ ENDIF
+
+C...Loop over lines in header. Define page feed and side borders.
+ DO 100 ILIN=1,48
+ LINE=' '
+ IF(ILIN.EQ.1) THEN
+ LINE(1:1)='1'
+ ELSE
+ LINE(2:3)='**'
+ LINE(78:79)='**'
+ ENDIF
+
+C...Separator lines and logos.
+ IF(ILIN.EQ.2.OR.ILIN.EQ.3.OR.ILIN.EQ.47.OR.ILIN.EQ.48) THEN
+ LINE(4:77)='***********************************************'//
+ & '***************************'
+ ELSEIF(ILIN.GE.6.AND.ILIN.LE.10) THEN
+ LINE(6:37)=LOGO(ILIN-5)
+ LINE(44:75)=LOGO(ILIN)
+ ELSEIF(ILIN.GE.13.AND.ILIN.LE.31) THEN
+ LINE(6:37)=LOGO(ILIN-2)
+ LINE(44:75)=LOGO(ILIN+17)
+ ELSEIF(ILIN.GE.34.AND.ILIN.LE.44) THEN
+ LINE(5:40)=REFER(2*ILIN-67)
+ LINE(41:76)=REFER(2*ILIN-66)
+ ENDIF
+
+C...Write lines to appropriate unit.
+ IF(MSTU(183)/10.EQ.199) THEN
+ WRITE(MSTU(11),'(A79)') LINE
+ ELSE
+ WRITE(*,'(A79)') LINE
+ ENDIF
+ 100 CONTINUE
+
+C...Check that matching subversions are linked.
+ IF(MSTU(183)/10.EQ.199.AND.MSTP(183)/10.EQ.199) THEN
+ IF(MSTU(182).LT.MSTP(186)) WRITE(MSTU(11),
+ & '(/'' Warning: JETSET subversion too old for PYTHIA''/)')
+ IF(MSTP(182).LT.MSTU(186)) WRITE(MSTU(11),
+ & '(/'' Warning: PYTHIA subversion too old for JETSET''/)')
+ ENDIF
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUUPDA
+ SUBROUTINE LUUPDA(MUPDA,LFN)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to facilitate the updating of particle and decay data.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5)
+ COMMON/LUDAT4/CHAF(500)
+ CHARACTER CHAF*8
+ SAVE /LUDAT1/,/LUDAT2/,/LUDAT3/,/LUDAT4/
+ CHARACTER CHINL*80,CHKC*4,CHVAR(19)*9,CHLIN*72,
+ &CHBLK(20)*72,CHOLD*12,CHTMP*12,CHNEW*12,CHCOM*12
+ DATA CHVAR/ 'KCHG(I,1)','KCHG(I,2)','KCHG(I,3)','PMAS(I,1)',
+ &'PMAS(I,2)','PMAS(I,3)','PMAS(I,4)','MDCY(I,1)','MDCY(I,2)',
+ &'MDCY(I,3)','MDME(I,1)','MDME(I,2)','BRAT(I) ','KFDP(I,1)',
+ &'KFDP(I,2)','KFDP(I,3)','KFDP(I,4)','KFDP(I,5)','CHAF(I) '/
+
+C...Write information on file for editing.
+ IF(MSTU(12).GE.1) CALL LULIST(0)
+ IF(MUPDA.EQ.1) THEN
+ DO 110 KC=1,MSTU(6)
+ WRITE(LFN,5000) KC,CHAF(KC),(KCHG(KC,J1),J1=1,3),
+ & (PMAS(KC,J2),J2=1,4),MDCY(KC,1)
+ DO 100 IDC=MDCY(KC,2),MDCY(KC,2)+MDCY(KC,3)-1
+ WRITE(LFN,5100) MDME(IDC,1),MDME(IDC,2),BRAT(IDC),
+ & (KFDP(IDC,J),J=1,5)
+ 100 CONTINUE
+ 110 CONTINUE
+
+C...Reset variables and read information from edited file.
+ ELSEIF(MUPDA.EQ.2) THEN
+ DO 130 I=1,MSTU(7)
+ MDME(I,1)=1
+ MDME(I,2)=0
+ BRAT(I)=0.
+ DO 120 J=1,5
+ KFDP(I,J)=0
+ 120 CONTINUE
+ 130 CONTINUE
+ KC=0
+ IDC=0
+ NDC=0
+ 140 READ(LFN,5200,END=150) CHINL
+ IF(CHINL(2:5).NE.' ') THEN
+ CHKC=CHINL(2:5)
+ IF(KC.NE.0) THEN
+ MDCY(KC,2)=0
+ IF(NDC.NE.0) MDCY(KC,2)=IDC+1-NDC
+ MDCY(KC,3)=NDC
+ ENDIF
+ READ(CHKC,5300) KC
+ IF(KC.LE.0.OR.KC.GT.MSTU(6)) CALL LUERRM(27,
+ & '(LUUPDA:) Read KC code illegal, KC ='//CHKC)
+ READ(CHINL,5000) KCR,CHAF(KC),(KCHG(KC,J1),J1=1,3),
+ & (PMAS(KC,J2),J2=1,4),MDCY(KC,1)
+ NDC=0
+ ELSE
+ IDC=IDC+1
+ NDC=NDC+1
+ IF(IDC.GE.MSTU(7)) CALL LUERRM(27,
+ & '(LUUPDA:) Decay data arrays full by KC ='//CHKC)
+ READ(CHINL,5100) MDME(IDC,1),MDME(IDC,2),BRAT(IDC),
+ & (KFDP(IDC,J),J=1,5)
+ ENDIF
+ GOTO 140
+ 150 MDCY(KC,2)=0
+ IF(NDC.NE.0) MDCY(KC,2)=IDC+1-NDC
+ MDCY(KC,3)=NDC
+
+C...Perform possible tests that new information is consistent.
+ MSTJ24=MSTJ(24)
+ MSTJ(24)=0
+ DO 180 KC=1,MSTU(6)
+ WRITE(CHKC,5300) KC
+ IF(MIN(PMAS(KC,1),PMAS(KC,2),PMAS(KC,3),PMAS(KC,1)-PMAS(KC,3),
+ & PMAS(KC,4)).LT.0..OR.MDCY(KC,3).LT.0) CALL LUERRM(17,
+ & '(LUUPDA:) Mass/width/life/(# channels) wrong for KC ='//CHKC)
+ BRSUM=0.
+ DO 170 IDC=MDCY(KC,2),MDCY(KC,2)+MDCY(KC,3)-1
+ IF(MDME(IDC,2).GT.80) GOTO 170
+ KQ=KCHG(KC,1)
+ PMS=PMAS(KC,1)-PMAS(KC,3)-PARJ(64)
+ MERR=0
+ DO 160 J=1,5
+ KP=KFDP(IDC,J)
+ IF(KP.EQ.0.OR.KP.EQ.81.OR.IABS(KP).EQ.82) THEN
+ ELSEIF(LUCOMP(KP).EQ.0) THEN
+ MERR=3
+ ELSE
+ KQ=KQ-LUCHGE(KP)
+ PMS=PMS-ULMASS(KP)
+ ENDIF
+ 160 CONTINUE
+ IF(KQ.NE.0) MERR=MAX(2,MERR)
+ IF(KFDP(IDC,2).NE.0.AND.(KC.LE.20.OR.KC.GT.40).AND.
+ & (KC.LE.80.OR.KC.GT.100).AND.MDME(IDC,2).NE.34.AND.
+ & MDME(IDC,2).NE.61.AND.PMS.LT.0.) MERR=MAX(1,MERR)
+ IF(MERR.EQ.3) CALL LUERRM(17,
+ & '(LUUPDA:) Unknown particle code in decay of KC ='//CHKC)
+ IF(MERR.EQ.2) CALL LUERRM(17,
+ & '(LUUPDA:) Charge not conserved in decay of KC ='//CHKC)
+ IF(MERR.EQ.1) CALL LUERRM(7,
+ & '(LUUPDA:) Kinematically unallowed decay of KC ='//CHKC)
+ BRSUM=BRSUM+BRAT(IDC)
+ 170 CONTINUE
+ WRITE(CHTMP,5500) BRSUM
+ IF(ABS(BRSUM).GT.0.0005.AND.ABS(BRSUM-1.).GT.0.0005) CALL
+ & LUERRM(7,'(LUUPDA:) Sum of branching ratios is '//CHTMP(5:12)//
+ & ' for KC ='//CHKC)
+ 180 CONTINUE
+ MSTJ(24)=MSTJ24
+
+C...Initialize writing of DATA statements for inclusion in program.
+ ELSEIF(MUPDA.EQ.3) THEN
+ DO 250 IVAR=1,19
+ NDIM=MSTU(6)
+ IF(IVAR.GE.11.AND.IVAR.LE.18) NDIM=MSTU(7)
+ NLIN=1
+ CHLIN=' '
+ CHLIN(7:35)='DATA ('//CHVAR(IVAR)//',I= 1, )/'
+ LLIN=35
+ CHOLD='START'
+
+C...Loop through variables for conversion to characters.
+ DO 230 IDIM=1,NDIM
+ IF(IVAR.EQ.1) WRITE(CHTMP,5400) KCHG(IDIM,1)
+ IF(IVAR.EQ.2) WRITE(CHTMP,5400) KCHG(IDIM,2)
+ IF(IVAR.EQ.3) WRITE(CHTMP,5400) KCHG(IDIM,3)
+ IF(IVAR.EQ.4) WRITE(CHTMP,5500) PMAS(IDIM,1)
+ IF(IVAR.EQ.5) WRITE(CHTMP,5500) PMAS(IDIM,2)
+ IF(IVAR.EQ.6) WRITE(CHTMP,5500) PMAS(IDIM,3)
+ IF(IVAR.EQ.7) WRITE(CHTMP,5500) PMAS(IDIM,4)
+ IF(IVAR.EQ.8) WRITE(CHTMP,5400) MDCY(IDIM,1)
+ IF(IVAR.EQ.9) WRITE(CHTMP,5400) MDCY(IDIM,2)
+ IF(IVAR.EQ.10) WRITE(CHTMP,5400) MDCY(IDIM,3)
+ IF(IVAR.EQ.11) WRITE(CHTMP,5400) MDME(IDIM,1)
+ IF(IVAR.EQ.12) WRITE(CHTMP,5400) MDME(IDIM,2)
+ IF(IVAR.EQ.13) WRITE(CHTMP,5500) BRAT(IDIM)
+ IF(IVAR.EQ.14) WRITE(CHTMP,5400) KFDP(IDIM,1)
+ IF(IVAR.EQ.15) WRITE(CHTMP,5400) KFDP(IDIM,2)
+ IF(IVAR.EQ.16) WRITE(CHTMP,5400) KFDP(IDIM,3)
+ IF(IVAR.EQ.17) WRITE(CHTMP,5400) KFDP(IDIM,4)
+ IF(IVAR.EQ.18) WRITE(CHTMP,5400) KFDP(IDIM,5)
+ IF(IVAR.EQ.19) CHTMP=CHAF(IDIM)
+
+C...Length of variable, trailing decimal zeros, quotation marks.
+ LLOW=1
+ LHIG=1
+ DO 190 LL=1,12
+ IF(CHTMP(13-LL:13-LL).NE.' ') LLOW=13-LL
+ IF(CHTMP(LL:LL).NE.' ') LHIG=LL
+ 190 CONTINUE
+ CHNEW=CHTMP(LLOW:LHIG)//' '
+ LNEW=1+LHIG-LLOW
+ IF((IVAR.GE.4.AND.IVAR.LE.7).OR.IVAR.EQ.13) THEN
+ LNEW=LNEW+1
+ 200 LNEW=LNEW-1
+ IF(CHNEW(LNEW:LNEW).EQ.'0') GOTO 200
+ IF(LNEW.EQ.1) CHNEW(1:2)='0.'
+ IF(LNEW.EQ.1) LNEW=2
+ ELSEIF(IVAR.EQ.19) THEN
+ DO 210 LL=LNEW,1,-1
+ IF(CHNEW(LL:LL).EQ.'''') THEN
+ CHTMP=CHNEW
+ CHNEW=CHTMP(1:LL)//''''//CHTMP(LL+1:11)
+ LNEW=LNEW+1
+ ENDIF
+ 210 CONTINUE
+ CHTMP=CHNEW
+ CHNEW(1:LNEW+2)=''''//CHTMP(1:LNEW)//''''
+ LNEW=LNEW+2
+ ENDIF
+
+C...Form composite character string, often including repetition counter.
+ IF(CHNEW.NE.CHOLD) THEN
+ NRPT=1
+ CHOLD=CHNEW
+ CHCOM=CHNEW
+ LCOM=LNEW
+ ELSE
+ LRPT=LNEW+1
+ IF(NRPT.GE.2) LRPT=LNEW+3
+ IF(NRPT.GE.10) LRPT=LNEW+4
+ IF(NRPT.GE.100) LRPT=LNEW+5
+ IF(NRPT.GE.1000) LRPT=LNEW+6
+ LLIN=LLIN-LRPT
+ NRPT=NRPT+1
+ WRITE(CHTMP,5400) NRPT
+ LRPT=1
+ IF(NRPT.GE.10) LRPT=2
+ IF(NRPT.GE.100) LRPT=3
+ IF(NRPT.GE.1000) LRPT=4
+ CHCOM(1:LRPT+1+LNEW)=CHTMP(13-LRPT:12)//'*'//CHNEW(1:LNEW)
+ LCOM=LRPT+1+LNEW
+ ENDIF
+
+C...Add characters to end of line, to new line (after storing old line),
+C...or to new block of lines (after writing old block).
+ IF(LLIN+LCOM.LE.70) THEN
+ CHLIN(LLIN+1:LLIN+LCOM+1)=CHCOM(1:LCOM)//','
+ LLIN=LLIN+LCOM+1
+ ELSEIF(NLIN.LE.19) THEN
+ CHLIN(LLIN+1:72)=' '
+ CHBLK(NLIN)=CHLIN
+ NLIN=NLIN+1
+ CHLIN(6:6+LCOM+1)='&'//CHCOM(1:LCOM)//','
+ LLIN=6+LCOM+1
+ ELSE
+ CHLIN(LLIN:72)='/'//' '
+ CHBLK(NLIN)=CHLIN
+ WRITE(CHTMP,5400) IDIM-NRPT
+ CHBLK(1)(30:33)=CHTMP(9:12)
+ DO 220 ILIN=1,NLIN
+ WRITE(LFN,5600) CHBLK(ILIN)
+ 220 CONTINUE
+ NLIN=1
+ CHLIN=' '
+ CHLIN(7:35+LCOM+1)='DATA ('//CHVAR(IVAR)//',I= , )/'//
+ & CHCOM(1:LCOM)//','
+ WRITE(CHTMP,5400) IDIM-NRPT+1
+ CHLIN(25:28)=CHTMP(9:12)
+ LLIN=35+LCOM+1
+ ENDIF
+ 230 CONTINUE
+
+C...Write final block of lines.
+ CHLIN(LLIN:72)='/'//' '
+ CHBLK(NLIN)=CHLIN
+ WRITE(CHTMP,5400) NDIM
+ CHBLK(1)(30:33)=CHTMP(9:12)
+ DO 240 ILIN=1,NLIN
+ WRITE(LFN,5600) CHBLK(ILIN)
+ 240 CONTINUE
+ 250 CONTINUE
+ ENDIF
+
+C...Formats for reading and writing particle data.
+ 5000 FORMAT(1X,I4,2X,A8,3I3,3F12.5,2X,F12.5,I3)
+ 5100 FORMAT(5X,2I5,F12.5,5I8)
+ 5200 FORMAT(A80)
+ 5300 FORMAT(I4)
+ 5400 FORMAT(I12)
+ 5500 FORMAT(F12.5)
+ 5600 FORMAT(A72)
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, KLU
+ FUNCTION KLU(I,J)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to provide various integer-valued event related data.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+
+C...Default value. For I=0 number of entries, number of stable entries
+C...or 3 times total charge.
+ KLU=0
+ IF(I.LT.0.OR.I.GT.MSTU(4).OR.J.LE.0) THEN
+ ELSEIF(I.EQ.0.AND.J.EQ.1) THEN
+ KLU=N
+ ELSEIF(I.EQ.0.AND.(J.EQ.2.OR.J.EQ.6)) THEN
+ DO 100 I1=1,N
+ IF(J.EQ.2.AND.K(I1,1).GE.1.AND.K(I1,1).LE.10) KLU=KLU+1
+ IF(J.EQ.6.AND.K(I1,1).GE.1.AND.K(I1,1).LE.10) KLU=KLU+
+ & LUCHGE(K(I1,2))
+ 100 CONTINUE
+ ELSEIF(I.EQ.0) THEN
+
+C...For I > 0 direct readout of K matrix or charge.
+ ELSEIF(J.LE.5) THEN
+ KLU=K(I,J)
+ ELSEIF(J.EQ.6) THEN
+ KLU=LUCHGE(K(I,2))
+
+C...Status (existing/fragmented/decayed), parton/hadron separation.
+ ELSEIF(J.LE.8) THEN
+ IF(K(I,1).GE.1.AND.K(I,1).LE.10) KLU=1
+ IF(J.EQ.8) KLU=KLU*K(I,2)
+ ELSEIF(J.LE.12) THEN
+ KFA=IABS(K(I,2))
+ KC=LUCOMP(KFA)
+ KQ=0
+ IF(KC.NE.0) KQ=KCHG(KC,2)
+ IF(J.EQ.9.AND.KC.NE.0.AND.KQ.NE.0) KLU=K(I,2)
+ IF(J.EQ.10.AND.KC.NE.0.AND.KQ.EQ.0) KLU=K(I,2)
+ IF(J.EQ.11) KLU=KC
+ IF(J.EQ.12) KLU=KQ*ISIGN(1,K(I,2))
+
+C...Heaviest flavour in hadron/diquark.
+ ELSEIF(J.EQ.13) THEN
+ KFA=IABS(K(I,2))
+ KLU=MOD(KFA/100,10)*(-1)**MOD(KFA/100,10)
+ IF(KFA.LT.10) KLU=KFA
+ IF(MOD(KFA/1000,10).NE.0) KLU=MOD(KFA/1000,10)
+ KLU=KLU*ISIGN(1,K(I,2))
+
+C...Particle history: generation, ancestor, rank.
+ ELSEIF(J.LE.15) THEN
+ I2=I
+ I1=I
+ 110 KLU=KLU+1
+ I2=I1
+ I1=K(I1,3)
+ IF(I1.GT.0.AND.K(I1,1).GT.0.AND.K(I1,1).LE.20) GOTO 110
+ IF(J.EQ.15) KLU=I2
+ ELSEIF(J.EQ.16) THEN
+ KFA=IABS(K(I,2))
+ IF(K(I,1).LE.20.AND.((KFA.GE.11.AND.KFA.LE.20).OR.KFA.EQ.22.OR.
+ & (KFA.GT.100.AND.MOD(KFA/10,10).NE.0))) THEN
+ I1=I
+ 120 I2=I1
+ I1=K(I1,3)
+ IF(I1.GT.0) THEN
+ KFAM=IABS(K(I1,2))
+ ILP=1
+ IF(KFAM.NE.0.AND.KFAM.LE.10) ILP=0
+ IF(KFAM.EQ.21.OR.KFAM.EQ.91.OR.KFAM.EQ.92.OR.KFAM.EQ.93)
+ & ILP=0
+ IF(KFAM.GT.100.AND.MOD(KFAM/10,10).EQ.0) ILP=0
+ IF(ILP.EQ.1) GOTO 120
+ ENDIF
+ IF(K(I1,1).EQ.12) THEN
+ DO 130 I3=I1+1,I2
+ IF(K(I3,3).EQ.K(I2,3).AND.K(I3,2).NE.91.AND.K(I3,2).NE.92
+ & .AND.K(I3,2).NE.93) KLU=KLU+1
+ 130 CONTINUE
+ ELSE
+ I3=I2
+ 140 KLU=KLU+1
+ I3=I3+1
+ IF(I3.LT.N.AND.K(I3,3).EQ.K(I2,3)) GOTO 140
+ ENDIF
+ ENDIF
+
+C...Particle coming from collapsing jet system or not.
+ ELSEIF(J.EQ.17) THEN
+ I1=I
+ 150 KLU=KLU+1
+ I3=I1
+ I1=K(I1,3)
+ I0=MAX(1,I1)
+ KC=LUCOMP(K(I0,2))
+ IF(I1.EQ.0.OR.K(I0,1).LE.0.OR.K(I0,1).GT.20.OR.KC.EQ.0) THEN
+ IF(KLU.EQ.1) KLU=-1
+ IF(KLU.GT.1) KLU=0
+ RETURN
+ ENDIF
+ IF(KCHG(KC,2).EQ.0) GOTO 150
+ IF(K(I1,1).NE.12) KLU=0
+ IF(K(I1,1).NE.12) RETURN
+ I2=I1
+ 160 I2=I2+1
+ IF(I2.LT.N.AND.K(I2,1).NE.11) GOTO 160
+ K3M=K(I3-1,3)
+ IF(K3M.GE.I1.AND.K3M.LE.I2) KLU=0
+ K3P=K(I3+1,3)
+ IF(I3.LT.N.AND.K3P.GE.I1.AND.K3P.LE.I2) KLU=0
+
+C...Number of decay products. Colour flow.
+ ELSEIF(J.EQ.18) THEN
+ IF(K(I,1).EQ.11.OR.K(I,1).EQ.12) KLU=MAX(0,K(I,5)-K(I,4)+1)
+ IF(K(I,4).EQ.0.OR.K(I,5).EQ.0) KLU=0
+ ELSEIF(J.LE.22) THEN
+ IF(K(I,1).NE.3.AND.K(I,1).NE.13.AND.K(I,1).NE.14) RETURN
+ IF(J.EQ.19) KLU=MOD(K(I,4)/MSTU(5),MSTU(5))
+ IF(J.EQ.20) KLU=MOD(K(I,5)/MSTU(5),MSTU(5))
+ IF(J.EQ.21) KLU=MOD(K(I,4),MSTU(5))
+ IF(J.EQ.22) KLU=MOD(K(I,5),MSTU(5))
+ ELSE
+ ENDIF
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, PLU
+ FUNCTION PLU(I,J)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to provide various real-valued event related data.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+ DIMENSION PSUM(4)
+
+C...Set default value. For I = 0 sum of momenta or charges,
+C...or invariant mass of system.
+ PLU=0.
+ IF(I.LT.0.OR.I.GT.MSTU(4).OR.J.LE.0) THEN
+ ELSEIF(I.EQ.0.AND.J.LE.4) THEN
+ DO 100 I1=1,N
+ IF(K(I1,1).GT.0.AND.K(I1,1).LE.10) PLU=PLU+P(I1,J)
+ 100 CONTINUE
+ ELSEIF(I.EQ.0.AND.J.EQ.5) THEN
+ DO 120 J1=1,4
+ PSUM(J1)=0.
+ DO 110 I1=1,N
+ IF(K(I1,1).GT.0.AND.K(I1,1).LE.10) PSUM(J1)=PSUM(J1)+P(I1,J1)
+ 110 CONTINUE
+ 120 CONTINUE
+ PLU=SQRT(MAX(0.D0,PSUM(4)**2-PSUM(1)**2-PSUM(2)**2-PSUM(3)**2))
+ ELSEIF(I.EQ.0.AND.J.EQ.6) THEN
+ DO 130 I1=1,N
+ IF(K(I1,1).GT.0.AND.K(I1,1).LE.10) PLU=PLU+LUCHGE(K(I1,2))/3.
+ 130 CONTINUE
+ ELSEIF(I.EQ.0) THEN
+
+C...Direct readout of P matrix.
+ ELSEIF(J.LE.5) THEN
+ PLU=P(I,J)
+
+C...Charge, total momentum, transverse momentum, transverse mass.
+ ELSEIF(J.LE.12) THEN
+ IF(J.EQ.6) PLU=LUCHGE(K(I,2))/3.
+ IF(J.EQ.7.OR.J.EQ.8) PLU=P(I,1)**2+P(I,2)**2+P(I,3)**2
+ IF(J.EQ.9.OR.J.EQ.10) PLU=P(I,1)**2+P(I,2)**2
+ IF(J.EQ.11.OR.J.EQ.12) PLU=P(I,5)**2+P(I,1)**2+P(I,2)**2
+ IF(J.EQ.8.OR.J.EQ.10.OR.J.EQ.12) PLU=SQRT(PLU)
+
+C...Theta and phi angle in radians or degrees.
+ ELSEIF(J.LE.16) THEN
+ IF(J.LE.14) PLU=ULANGL(P(I,3),SQRT(P(I,1)**2+P(I,2)**2))
+ IF(J.GE.15) PLU=ULANGL(P(I,1),P(I,2))
+ IF(J.EQ.14.OR.J.EQ.16) PLU=PLU*180./PARU(1)
+
+C...True rapidity, rapidity with pion mass, pseudorapidity.
+ ELSEIF(J.LE.19) THEN
+ PMR=0.
+ IF(J.EQ.17) PMR=P(I,5)
+ IF(J.EQ.18) PMR=ULMASS(211)
+ PR=MAX(1D-20,PMR**2+P(I,1)**2+P(I,2)**2)
+ PLU=SIGN(LOG(MIN((SQRT(PR+P(I,3)**2)+ABS(P(I,3)))/SQRT(PR),
+ & 1D20)),P(I,3))
+
+C...Energy and momentum fractions (only to be used in CM frame).
+ ELSEIF(J.LE.25) THEN
+ IF(J.EQ.20) PLU=2.*SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2)/PARU(21)
+ IF(J.EQ.21) PLU=2.*P(I,3)/PARU(21)
+ IF(J.EQ.22) PLU=2.*SQRT(P(I,1)**2+P(I,2)**2)/PARU(21)
+ IF(J.EQ.23) PLU=2.*P(I,4)/PARU(21)
+ IF(J.EQ.24) PLU=(P(I,4)+P(I,3))/PARU(21)
+ IF(J.EQ.25) PLU=(P(I,4)-P(I,3))/PARU(21)
+ ENDIF
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUSPHE
+ SUBROUTINE LUSPHE(SPH,APL)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to perform sphericity tensor analysis to give sphericity,
+C...aplanarity and the related event axes.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+ DIMENSION SM(3,3),SV(3,3)
+
+C...Calculate matrix to be diagonalized.
+ NP=0
+ DO 110 J1=1,3
+ DO 100 J2=J1,3
+ SM(J1,J2)=0.
+ 100 CONTINUE
+ 110 CONTINUE
+ PS=0.
+ DO 140 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 140
+ IF(MSTU(41).GE.2) THEN
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR.
+ & KC.EQ.18) GOTO 140
+ IF(MSTU(41).GE.3.AND.KCHG(KC,2).EQ.0.AND.LUCHGE(K(I,2)).EQ.0)
+ & GOTO 140
+ ENDIF
+ NP=NP+1
+ PA=SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2)
+ PWT=1.
+ IF(ABS(PARU(41)-2.).GT.0.001) PWT=MAX(1D-10,PA)**(PARU(41)-2.)
+ DO 130 J1=1,3
+ DO 120 J2=J1,3
+ SM(J1,J2)=SM(J1,J2)+PWT*P(I,J1)*P(I,J2)
+ 120 CONTINUE
+ 130 CONTINUE
+ PS=PS+PWT*PA**2
+ 140 CONTINUE
+
+C...Very low multiplicities (0 or 1) not considered.
+ IF(NP.LE.1) THEN
+ CALL LUERRM(8,'(LUSPHE:) too few particles for analysis')
+ SPH=-1.
+ APL=-1.
+ RETURN
+ ENDIF
+ DO 160 J1=1,3
+ DO 150 J2=J1,3
+ SM(J1,J2)=SM(J1,J2)/PS
+ 150 CONTINUE
+ 160 CONTINUE
+
+C...Find eigenvalues to matrix (third degree equation).
+ SQ=(SM(1,1)*SM(2,2)+SM(1,1)*SM(3,3)+SM(2,2)*SM(3,3)-SM(1,2)**2-
+ &SM(1,3)**2-SM(2,3)**2)/3.-1./9.
+ SR=-0.5*(SQ+1./9.+SM(1,1)*SM(2,3)**2+SM(2,2)*SM(1,3)**2+SM(3,3)*
+ &SM(1,2)**2-SM(1,1)*SM(2,2)*SM(3,3))+SM(1,2)*SM(1,3)*SM(2,3)+1./27.
+ SP=COS(ACOS(MAX(MIN(SR/SQRT(-SQ**3),1.D0),-1.D0))/3.)
+ P(N+1,4)=1./3.+SQRT(-SQ)*MAX(2.*SP,SQRT(3.*(1.-SP**2))-SP)
+ P(N+3,4)=1./3.+SQRT(-SQ)*MIN(2.*SP,-SQRT(3.*(1.-SP**2))-SP)
+ P(N+2,4)=1.-P(N+1,4)-P(N+3,4)
+ IF(P(N+2,4).LT.1D-5) THEN
+ CALL LUERRM(8,'(LUSPHE:) all particles back-to-back')
+ SPH=-1.
+ APL=-1.
+ RETURN
+ ENDIF
+
+C...Find first and last eigenvector by solving equation system.
+ DO 240 I=1,3,2
+ DO 180 J1=1,3
+ SV(J1,J1)=SM(J1,J1)-P(N+I,4)
+ DO 170 J2=J1+1,3
+ SV(J1,J2)=SM(J1,J2)
+ SV(J2,J1)=SM(J1,J2)
+ 170 CONTINUE
+ 180 CONTINUE
+ SMAX=0.
+ DO 200 J1=1,3
+ DO 190 J2=1,3
+ IF(ABS(SV(J1,J2)).LE.SMAX) GOTO 190
+ JA=J1
+ JB=J2
+ SMAX=ABS(SV(J1,J2))
+ 190 CONTINUE
+ 200 CONTINUE
+ SMAX=0.
+ DO 220 J3=JA+1,JA+2
+ J1=J3-3*((J3-1)/3)
+ RL=SV(J1,JB)/SV(JA,JB)
+ DO 210 J2=1,3
+ SV(J1,J2)=SV(J1,J2)-RL*SV(JA,J2)
+ IF(ABS(SV(J1,J2)).LE.SMAX) GOTO 210
+ JC=J1
+ SMAX=ABS(SV(J1,J2))
+ 210 CONTINUE
+ 220 CONTINUE
+ JB1=JB+1-3*(JB/3)
+ JB2=JB+2-3*((JB+1)/3)
+ P(N+I,JB1)=-SV(JC,JB2)
+ P(N+I,JB2)=SV(JC,JB1)
+ P(N+I,JB)=-(SV(JA,JB1)*P(N+I,JB1)+SV(JA,JB2)*P(N+I,JB2))/
+ &SV(JA,JB)
+ PA=SQRT(P(N+I,1)**2+P(N+I,2)**2+P(N+I,3)**2)
+ SGN=(-1.)**INT(RLU(0)+0.5)
+ DO 230 J=1,3
+ P(N+I,J)=SGN*P(N+I,J)/PA
+ 230 CONTINUE
+ 240 CONTINUE
+
+C...Middle axis orthogonal to other two. Fill other codes.
+ SGN=(-1.)**INT(RLU(0)+0.5)
+ P(N+2,1)=SGN*(P(N+1,2)*P(N+3,3)-P(N+1,3)*P(N+3,2))
+ P(N+2,2)=SGN*(P(N+1,3)*P(N+3,1)-P(N+1,1)*P(N+3,3))
+ P(N+2,3)=SGN*(P(N+1,1)*P(N+3,2)-P(N+1,2)*P(N+3,1))
+ DO 260 I=1,3
+ K(N+I,1)=31
+ K(N+I,2)=95
+ K(N+I,3)=I
+ K(N+I,4)=0
+ K(N+I,5)=0
+ P(N+I,5)=0.
+ DO 250 J=1,5
+ V(I,J)=0.
+ 250 CONTINUE
+ 260 CONTINUE
+
+C...Calculate sphericity and aplanarity. Select storing option.
+ SPH=1.5*(P(N+2,4)+P(N+3,4))
+ APL=1.5*P(N+3,4)
+ MSTU(61)=N+1
+ MSTU(62)=NP
+ IF(MSTU(43).LE.1) MSTU(3)=3
+ IF(MSTU(43).GE.2) N=N+3
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUTHRU
+ SUBROUTINE LUTHRU(THR,OBL)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to perform thrust analysis to give thrust, oblateness
+C...and the related event axes.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+ DIMENSION TDI(3),TPR(3)
+
+C...Take copy of particles that are to be considered in thrust analysis.
+ NP=0
+ PS=0.
+ DO 100 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 100
+ IF(MSTU(41).GE.2) THEN
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR.
+ & KC.EQ.18) GOTO 100
+ IF(MSTU(41).GE.3.AND.KCHG(KC,2).EQ.0.AND.LUCHGE(K(I,2)).EQ.0)
+ & GOTO 100
+ ENDIF
+ IF(N+NP+MSTU(44)+15.GE.MSTU(4)-MSTU(32)-5) THEN
+ CALL LUERRM(11,'(LUTHRU:) no more memory left in LUJETS')
+ THR=-2.
+ OBL=-2.
+ RETURN
+ ENDIF
+ NP=NP+1
+ K(N+NP,1)=23
+ P(N+NP,1)=P(I,1)
+ P(N+NP,2)=P(I,2)
+ P(N+NP,3)=P(I,3)
+ P(N+NP,4)=SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2)
+ P(N+NP,5)=1.
+ IF(ABS(PARU(42)-1.).GT.0.001) P(N+NP,5)=P(N+NP,4)**(PARU(42)-1.)
+ PS=PS+P(N+NP,4)*P(N+NP,5)
+ 100 CONTINUE
+
+C...Very low multiplicities (0 or 1) not considered.
+ IF(NP.LE.1) THEN
+ CALL LUERRM(8,'(LUTHRU:) too few particles for analysis')
+ THR=-1.
+ OBL=-1.
+ RETURN
+ ENDIF
+
+C...Loop over thrust and major. T axis along z direction in latter case.
+ DO 320 ILD=1,2
+ IF(ILD.EQ.2) THEN
+ K(N+NP+1,1)=31
+ PHI=ULANGL(P(N+NP+1,1),P(N+NP+1,2))
+ MSTU(33)=1
+ CALL LUDBRB(N+1,N+NP+1,0.D0,-PHI,0D0,0D0,0D0)
+ THE=ULANGL(P(N+NP+1,3),P(N+NP+1,1))
+ CALL LUDBRB(N+1,N+NP+1,-THE,0.D0,0D0,0D0,0D0)
+ ENDIF
+
+C...Find and order particles with highest p (pT for major).
+ DO 110 ILF=N+NP+4,N+NP+MSTU(44)+4
+ P(ILF,4)=0.
+ 110 CONTINUE
+ DO 160 I=N+1,N+NP
+ IF(ILD.EQ.2) P(I,4)=SQRT(P(I,1)**2+P(I,2)**2)
+ DO 130 ILF=N+NP+MSTU(44)+3,N+NP+4,-1
+ IF(P(I,4).LE.P(ILF,4)) GOTO 140
+ DO 120 J=1,5
+ P(ILF+1,J)=P(ILF,J)
+ 120 CONTINUE
+ 130 CONTINUE
+ ILF=N+NP+3
+ 140 DO 150 J=1,5
+ P(ILF+1,J)=P(I,J)
+ 150 CONTINUE
+ 160 CONTINUE
+
+C...Find and order initial axes with highest thrust (major).
+ DO 170 ILG=N+NP+MSTU(44)+5,N+NP+MSTU(44)+15
+ P(ILG,4)=0.
+ 170 CONTINUE
+ NC=2**(MIN(MSTU(44),NP)-1)
+ DO 250 ILC=1,NC
+ DO 180 J=1,3
+ TDI(J)=0.
+ 180 CONTINUE
+ DO 200 ILF=1,MIN(MSTU(44),NP)
+ SGN=P(N+NP+ILF+3,5)
+ IF(2**ILF*((ILC+2**(ILF-1)-1)/2**ILF).GE.ILC) SGN=-SGN
+ DO 190 J=1,4-ILD
+ TDI(J)=TDI(J)+SGN*P(N+NP+ILF+3,J)
+ 190 CONTINUE
+ 200 CONTINUE
+ TDS=TDI(1)**2+TDI(2)**2+TDI(3)**2
+ DO 220 ILG=N+NP+MSTU(44)+MIN(ILC,10)+4,N+NP+MSTU(44)+5,-1
+ IF(TDS.LE.P(ILG,4)) GOTO 230
+ DO 210 J=1,4
+ P(ILG+1,J)=P(ILG,J)
+ 210 CONTINUE
+ 220 CONTINUE
+ ILG=N+NP+MSTU(44)+4
+ 230 DO 240 J=1,3
+ P(ILG+1,J)=TDI(J)
+ 240 CONTINUE
+ P(ILG+1,4)=TDS
+ 250 CONTINUE
+
+C...Iterate direction of axis until stable maximum.
+ P(N+NP+ILD,4)=0.
+ ILG=0
+ 260 ILG=ILG+1
+ THP=0.
+ 270 THPS=THP
+ DO 280 J=1,3
+ IF(THP.LE.1D-10) TDI(J)=P(N+NP+MSTU(44)+4+ILG,J)
+ IF(THP.GT.1D-10) TDI(J)=TPR(J)
+ TPR(J)=0.
+ 280 CONTINUE
+ DO 300 I=N+1,N+NP
+ SGN=SIGN(P(I,5),TDI(1)*P(I,1)+TDI(2)*P(I,2)+TDI(3)*P(I,3))
+ DO 290 J=1,4-ILD
+ TPR(J)=TPR(J)+SGN*P(I,J)
+ 290 CONTINUE
+ 300 CONTINUE
+ THP=SQRT(TPR(1)**2+TPR(2)**2+TPR(3)**2)/PS
+ IF(THP.GE.THPS+PARU(48)) GOTO 270
+
+C...Save good axis. Try new initial axis until a number of tries agree.
+ IF(THP.LT.P(N+NP+ILD,4)-PARU(48).AND.ILG.LT.MIN(10,NC)) GOTO 260
+ IF(THP.GT.P(N+NP+ILD,4)+PARU(48)) THEN
+ IAGR=0
+ SGN=(-1.)**INT(RLU(0)+0.5)
+ DO 310 J=1,3
+ P(N+NP+ILD,J)=SGN*TPR(J)/(PS*THP)
+ 310 CONTINUE
+ P(N+NP+ILD,4)=THP
+ P(N+NP+ILD,5)=0.
+ ENDIF
+ IAGR=IAGR+1
+ IF(IAGR.LT.MSTU(45).AND.ILG.LT.MIN(10,NC)) GOTO 260
+ 320 CONTINUE
+
+C...Find minor axis and value by orthogonality.
+ SGN=(-1.)**INT(RLU(0)+0.5)
+ P(N+NP+3,1)=-SGN*P(N+NP+2,2)
+ P(N+NP+3,2)=SGN*P(N+NP+2,1)
+ P(N+NP+3,3)=0.
+ THP=0.
+ DO 330 I=N+1,N+NP
+ THP=THP+P(I,5)*ABS(P(N+NP+3,1)*P(I,1)+P(N+NP+3,2)*P(I,2))
+ 330 CONTINUE
+ P(N+NP+3,4)=THP/PS
+ P(N+NP+3,5)=0.
+
+C...Fill axis information. Rotate back to original coordinate system.
+ DO 350 ILD=1,3
+ K(N+ILD,1)=31
+ K(N+ILD,2)=96
+ K(N+ILD,3)=ILD
+ K(N+ILD,4)=0
+ K(N+ILD,5)=0
+ DO 340 J=1,5
+ P(N+ILD,J)=P(N+NP+ILD,J)
+ V(N+ILD,J)=0.
+ 340 CONTINUE
+ 350 CONTINUE
+ CALL LUDBRB(N+1,N+3,THE,PHI,0D0,0D0,0D0)
+
+C...Calculate thrust and oblateness. Select storing option.
+ THR=P(N+1,4)
+ OBL=P(N+2,4)-P(N+3,4)
+ MSTU(61)=N+1
+ MSTU(62)=NP
+ IF(MSTU(43).LE.1) MSTU(3)=3
+ IF(MSTU(43).GE.2) N=N+3
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUCLUS
+ SUBROUTINE LUCLUS(NJET)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to subdivide the particle content of an event into
+C...jets/clusters.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+ DIMENSION PS(5)
+ SAVE NSAV,NP,PS,PSS,RINIT,NPRE,NREM
+
+C...Functions: distance measure in pT or (pseudo)mass.
+ R2T(I1,I2)=(P(I1,5)*P(I2,5)-P(I1,1)*P(I2,1)-P(I1,2)*P(I2,2)-
+ &P(I1,3)*P(I2,3))*2.*P(I1,5)*P(I2,5)/(0.0001+P(I1,5)+P(I2,5))**2
+ R2M(I1,I2)=2.*P(I1,4)*P(I2,4)*(1.-(P(I1,1)*P(I2,1)+P(I1,2)*
+ &P(I2,2)+P(I1,3)*P(I2,3))/(P(I1,5)*P(I2,5)))
+
+C...If first time, reset. If reentering, skip preliminaries.
+ IF(MSTU(48).LE.0) THEN
+ NP=0
+ DO 100 J=1,5
+ PS(J)=0.
+ 100 CONTINUE
+ PSS=0.
+ ELSE
+ NJET=NSAV
+ IF(MSTU(43).GE.2) N=N-NJET
+ DO 110 I=N+1,N+NJET
+ P(I,5)=SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2)
+ 110 CONTINUE
+ IF(MSTU(46).LE.3) R2ACC=PARU(44)**2
+ IF(MSTU(46).GE.4) R2ACC=PARU(45)*PS(5)**2
+ NLOOP=0
+ GOTO 300
+ ENDIF
+
+C...Find which particles are to be considered in cluster search.
+ DO 140 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 140
+ IF(MSTU(41).GE.2) THEN
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR.
+ & KC.EQ.18) GOTO 140
+ IF(MSTU(41).GE.3.AND.KCHG(KC,2).EQ.0.AND.LUCHGE(K(I,2)).EQ.0)
+ & GOTO 140
+ ENDIF
+ IF(N+2*NP.GE.MSTU(4)-MSTU(32)-5) THEN
+ CALL LUERRM(11,'(LUCLUS:) no more memory left in LUJETS')
+ NJET=-1
+ RETURN
+ ENDIF
+
+C...Take copy of these particles, with space left for jets later on.
+ NP=NP+1
+ K(N+NP,3)=I
+ DO 120 J=1,5
+ P(N+NP,J)=P(I,J)
+ 120 CONTINUE
+ IF(MSTU(42).EQ.0) P(N+NP,5)=0.
+ IF(MSTU(42).EQ.1.AND.K(I,2).NE.22) P(N+NP,5)=PMAS(101,1)
+ P(N+NP,4)=SQRT(P(N+NP,5)**2+P(I,1)**2+P(I,2)**2+P(I,3)**2)
+ P(N+NP,5)=SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2)
+ DO 130 J=1,4
+ PS(J)=PS(J)+P(N+NP,J)
+ 130 CONTINUE
+ PSS=PSS+P(N+NP,5)
+ 140 CONTINUE
+ DO 160 I=N+1,N+NP
+ K(I+NP,3)=K(I,3)
+ DO 150 J=1,5
+ P(I+NP,J)=P(I,J)
+ 150 CONTINUE
+ 160 CONTINUE
+ PS(5)=SQRT(MAX(0.D0,PS(4)**2-PS(1)**2-PS(2)**2-PS(3)**2))
+
+C...Very low multiplicities not considered.
+ IF(NP.LT.MSTU(47)) THEN
+ CALL LUERRM(8,'(LUCLUS:) too few particles for analysis')
+ NJET=-1
+ RETURN
+ ENDIF
+
+C...Find precluster configuration. If too few jets, make harder cuts.
+ NLOOP=0
+ IF(MSTU(46).LE.3) R2ACC=PARU(44)**2
+ IF(MSTU(46).GE.4) R2ACC=PARU(45)*PS(5)**2
+ RINIT=1.25*PARU(43)
+ IF(NP.LE.MSTU(47)+2) RINIT=0.
+ 170 RINIT=0.8*RINIT
+ NPRE=0
+ NREM=NP
+ DO 180 I=N+NP+1,N+2*NP
+ K(I,4)=0
+ 180 CONTINUE
+
+C...Sum up small momentum region. Jet if enough absolute momentum.
+ IF(MSTU(46).LE.2) THEN
+ DO 190 J=1,4
+ P(N+1,J)=0.
+ 190 CONTINUE
+ DO 210 I=N+NP+1,N+2*NP
+ IF(P(I,5).GT.2.*RINIT) GOTO 210
+ NREM=NREM-1
+ K(I,4)=1
+ DO 200 J=1,4
+ P(N+1,J)=P(N+1,J)+P(I,J)
+ 200 CONTINUE
+ 210 CONTINUE
+ P(N+1,5)=SQRT(P(N+1,1)**2+P(N+1,2)**2+P(N+1,3)**2)
+ IF(P(N+1,5).GT.2.*RINIT) NPRE=1
+ IF(RINIT.GE.0.2*PARU(43).AND.NPRE+NREM.LT.MSTU(47)) GOTO 170
+ IF(NREM.EQ.0) GOTO 170
+ ENDIF
+
+C...Find fastest remaining particle.
+ 220 NPRE=NPRE+1
+ PMAX=0.
+ DO 230 I=N+NP+1,N+2*NP
+ IF(K(I,4).NE.0.OR.P(I,5).LE.PMAX) GOTO 230
+ IMAX=I
+ PMAX=P(I,5)
+ 230 CONTINUE
+ DO 240 J=1,5
+ P(N+NPRE,J)=P(IMAX,J)
+ 240 CONTINUE
+ NREM=NREM-1
+ K(IMAX,4)=NPRE
+
+C...Sum up precluster around it according to pT separation.
+ IF(MSTU(46).LE.2) THEN
+ DO 260 I=N+NP+1,N+2*NP
+ IF(K(I,4).NE.0) GOTO 260
+ R2=R2T(I,IMAX)
+ IF(R2.GT.RINIT**2) GOTO 260
+ NREM=NREM-1
+ K(I,4)=NPRE
+ DO 250 J=1,4
+ P(N+NPRE,J)=P(N+NPRE,J)+P(I,J)
+ 250 CONTINUE
+ 260 CONTINUE
+ P(N+NPRE,5)=SQRT(P(N+NPRE,1)**2+P(N+NPRE,2)**2+P(N+NPRE,3)**2)
+
+C...Sum up precluster around it according to mass separation.
+ ELSE
+ 270 IMIN=0
+ R2MIN=RINIT**2
+ DO 280 I=N+NP+1,N+2*NP
+ IF(K(I,4).NE.0) GOTO 280
+ R2=R2M(I,N+NPRE)
+ IF(R2.GE.R2MIN) GOTO 280
+ IMIN=I
+ R2MIN=R2
+ 280 CONTINUE
+ IF(IMIN.NE.0) THEN
+ DO 290 J=1,4
+ P(N+NPRE,J)=P(N+NPRE,J)+P(IMIN,J)
+ 290 CONTINUE
+ P(N+NPRE,5)=SQRT(P(N+NPRE,1)**2+P(N+NPRE,2)**2+P(N+NPRE,3)**2)
+ NREM=NREM-1
+ K(IMIN,4)=NPRE
+ GOTO 270
+ ENDIF
+ ENDIF
+
+C...Check if more preclusters to be found. Start over if too few.
+ IF(RINIT.GE.0.2*PARU(43).AND.NPRE+NREM.LT.MSTU(47)) GOTO 170
+ IF(NREM.GT.0) GOTO 220
+ NJET=NPRE
+
+C...Reassign all particles to nearest jet. Sum up new jet momenta.
+ 300 TSAV=0.
+ PSJT=0.
+ 310 IF(MSTU(46).LE.1) THEN
+ DO 330 I=N+1,N+NJET
+ DO 320 J=1,4
+ V(I,J)=0.
+ 320 CONTINUE
+ 330 CONTINUE
+ DO 360 I=N+NP+1,N+2*NP
+ R2MIN=PSS**2
+ DO 340 IJET=N+1,N+NJET
+ IF(P(IJET,5).LT.RINIT) GOTO 340
+ R2=R2T(I,IJET)
+ IF(R2.GE.R2MIN) GOTO 340
+ IMIN=IJET
+ R2MIN=R2
+ 340 CONTINUE
+ K(I,4)=IMIN-N
+ DO 350 J=1,4
+ V(IMIN,J)=V(IMIN,J)+P(I,J)
+ 350 CONTINUE
+ 360 CONTINUE
+ PSJT=0.
+ DO 380 I=N+1,N+NJET
+ DO 370 J=1,4
+ P(I,J)=V(I,J)
+ 370 CONTINUE
+ P(I,5)=SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2)
+ PSJT=PSJT+P(I,5)
+ 380 CONTINUE
+ ENDIF
+
+C...Find two closest jets.
+ R2MIN=2.*MAX(R2ACC,PS(5)**2)
+ DO 400 ITRY1=N+1,N+NJET-1
+ DO 390 ITRY2=ITRY1+1,N+NJET
+ IF(MSTU(46).LE.2) R2=R2T(ITRY1,ITRY2)
+ IF(MSTU(46).GE.3) R2=R2M(ITRY1,ITRY2)
+ IF(R2.GE.R2MIN) GOTO 390
+ IMIN1=ITRY1
+ IMIN2=ITRY2
+ R2MIN=R2
+ 390 CONTINUE
+ 400 CONTINUE
+
+C...If allowed, join two closest jets and start over.
+ IF(NJET.GT.MSTU(47).AND.R2MIN.LT.R2ACC) THEN
+ IREC=MIN(IMIN1,IMIN2)
+ IDEL=MAX(IMIN1,IMIN2)
+ DO 410 J=1,4
+ P(IREC,J)=P(IMIN1,J)+P(IMIN2,J)
+ 410 CONTINUE
+ P(IREC,5)=SQRT(P(IREC,1)**2+P(IREC,2)**2+P(IREC,3)**2)
+ DO 430 I=IDEL+1,N+NJET
+ DO 420 J=1,5
+ P(I-1,J)=P(I,J)
+ 420 CONTINUE
+ 430 CONTINUE
+ IF(MSTU(46).GE.2) THEN
+ DO 440 I=N+NP+1,N+2*NP
+ IORI=N+K(I,4)
+ IF(IORI.EQ.IDEL) K(I,4)=IREC-N
+ IF(IORI.GT.IDEL) K(I,4)=K(I,4)-1
+ 440 CONTINUE
+ ENDIF
+ NJET=NJET-1
+ GOTO 300
+
+C...Divide up broad jet if empty cluster in list of final ones.
+ ELSEIF(NJET.EQ.MSTU(47).AND.MSTU(46).LE.1.AND.NLOOP.LE.2) THEN
+ DO 450 I=N+1,N+NJET
+ K(I,5)=0
+ 450 CONTINUE
+ DO 460 I=N+NP+1,N+2*NP
+ K(N+K(I,4),5)=K(N+K(I,4),5)+1
+ 460 CONTINUE
+ IEMP=0
+ DO 470 I=N+1,N+NJET
+ IF(K(I,5).EQ.0) IEMP=I
+ 470 CONTINUE
+ IF(IEMP.NE.0) THEN
+ NLOOP=NLOOP+1
+ ISPL=0
+ R2MAX=0.
+ DO 480 I=N+NP+1,N+2*NP
+ IF(K(N+K(I,4),5).LE.1.OR.P(I,5).LT.RINIT) GOTO 480
+ IJET=N+K(I,4)
+ R2=R2T(I,IJET)
+ IF(R2.LE.R2MAX) GOTO 480
+ ISPL=I
+ R2MAX=R2
+ 480 CONTINUE
+ IF(ISPL.NE.0) THEN
+ IJET=N+K(ISPL,4)
+ DO 490 J=1,4
+ P(IEMP,J)=P(ISPL,J)
+ P(IJET,J)=P(IJET,J)-P(ISPL,J)
+ 490 CONTINUE
+ P(IEMP,5)=P(ISPL,5)
+ P(IJET,5)=SQRT(P(IJET,1)**2+P(IJET,2)**2+P(IJET,3)**2)
+ IF(NLOOP.LE.2) GOTO 300
+ ENDIF
+ ENDIF
+ ENDIF
+
+C...If generalized thrust has not yet converged, continue iteration.
+ IF(MSTU(46).LE.1.AND.NLOOP.LE.2.AND.PSJT/PSS.GT.TSAV+PARU(48))
+ &THEN
+ TSAV=PSJT/PSS
+ GOTO 310
+ ENDIF
+
+C...Reorder jets according to energy.
+ DO 510 I=N+1,N+NJET
+ DO 500 J=1,5
+ V(I,J)=P(I,J)
+ 500 CONTINUE
+ 510 CONTINUE
+ DO 540 INEW=N+1,N+NJET
+ PEMAX=0.
+ DO 520 ITRY=N+1,N+NJET
+ IF(V(ITRY,4).LE.PEMAX) GOTO 520
+ IMAX=ITRY
+ PEMAX=V(ITRY,4)
+ 520 CONTINUE
+ K(INEW,1)=31
+ K(INEW,2)=97
+ K(INEW,3)=INEW-N
+ K(INEW,4)=0
+ DO 530 J=1,5
+ P(INEW,J)=V(IMAX,J)
+ 530 CONTINUE
+ V(IMAX,4)=-1.
+ K(IMAX,5)=INEW
+ 540 CONTINUE
+
+C...Clean up particle-jet assignments and jet information.
+ DO 550 I=N+NP+1,N+2*NP
+ IORI=K(N+K(I,4),5)
+ K(I,4)=IORI-N
+ IF(K(K(I,3),1).NE.3) K(K(I,3),4)=IORI-N
+ K(IORI,4)=K(IORI,4)+1
+ 550 CONTINUE
+ IEMP=0
+ PSJT=0.
+ DO 570 I=N+1,N+NJET
+ K(I,5)=0
+ PSJT=PSJT+P(I,5)
+ P(I,5)=SQRT(MAX(P(I,4)**2-P(I,5)**2,0.D0))
+ DO 560 J=1,5
+ V(I,J)=0.
+ 560 CONTINUE
+ IF(K(I,4).EQ.0) IEMP=I
+ 570 CONTINUE
+
+C...Select storing option. Output variables. Check for failure.
+ MSTU(61)=N+1
+ MSTU(62)=NP
+ MSTU(63)=NPRE
+ PARU(61)=PS(5)
+ PARU(62)=PSJT/PSS
+ PARU(63)=SQRT(R2MIN)
+ IF(NJET.LE.1) PARU(63)=0.
+ IF(IEMP.NE.0) THEN
+ CALL LUERRM(8,'(LUCLUS:) failed to reconstruct as requested')
+ NJET=-1
+ ENDIF
+ IF(MSTU(43).LE.1) MSTU(3)=NJET
+ IF(MSTU(43).GE.2) N=N+NJET
+ NSAV=NJET
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUCELL
+ SUBROUTINE LUCELL(NJET)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to provide a simple way of jet finding in an eta-phi-ET
+C...coordinate frame, as used for calorimeters at hadron colliders.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+
+C...Loop over all particles. Find cell that was hit by given particle.
+ PTLRAT=1./SINH(PARU(51))**2
+ NP=0
+ NC=N
+ DO 110 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 110
+ IF(P(I,1)**2+P(I,2)**2.LE.PTLRAT*P(I,3)**2) GOTO 110
+ IF(MSTU(41).GE.2) THEN
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR.
+ & KC.EQ.18) GOTO 110
+ IF(MSTU(41).GE.3.AND.KCHG(KC,2).EQ.0.AND.LUCHGE(K(I,2)).EQ.0)
+ & GOTO 110
+ ENDIF
+ NP=NP+1
+ PT=SQRT(P(I,1)**2+P(I,2)**2)
+ ETA=SIGN(LOG((SQRT(PT**2+P(I,3)**2)+ABS(P(I,3)))/PT),P(I,3))
+ IETA=MAX(1,MIN(MSTU(51),1+INT(MSTU(51)*0.5*(ETA/PARU(51)+1.))))
+ PHI=ULANGL(P(I,1),P(I,2))
+ IPHI=MAX(1,MIN(MSTU(52),1+INT(MSTU(52)*0.5*(PHI/PARU(1)+1.))))
+ IETPH=MSTU(52)*IETA+IPHI
+
+C...Add to cell already hit, or book new cell.
+ DO 100 IC=N+1,NC
+ IF(IETPH.EQ.K(IC,3)) THEN
+ K(IC,4)=K(IC,4)+1
+ P(IC,5)=P(IC,5)+PT
+ GOTO 110
+ ENDIF
+ 100 CONTINUE
+ IF(NC.GE.MSTU(4)-MSTU(32)-5) THEN
+ CALL LUERRM(11,'(LUCELL:) no more memory left in LUJETS')
+ NJET=-2
+ RETURN
+ ENDIF
+ NC=NC+1
+ K(NC,3)=IETPH
+ K(NC,4)=1
+ K(NC,5)=2
+ P(NC,1)=(PARU(51)/MSTU(51))*(2*IETA-1-MSTU(51))
+ P(NC,2)=(PARU(1)/MSTU(52))*(2*IPHI-1-MSTU(52))
+ P(NC,5)=PT
+ 110 CONTINUE
+
+C...Smear true bin content by calorimeter resolution.
+ IF(MSTU(53).GE.1) THEN
+ DO 130 IC=N+1,NC
+ PEI=P(IC,5)
+ IF(MSTU(53).EQ.2) PEI=P(IC,5)*COSH(P(IC,1))
+ 120 PEF=PEI+PARU(55)*SQRT(-2.*LOG(MAX(1D-10,RLU(0)))*PEI)*
+ & COS(PARU(2)*RLU(0))
+ IF(PEF.LT.0..OR.PEF.GT.PARU(56)*PEI) GOTO 120
+ P(IC,5)=PEF
+ IF(MSTU(53).EQ.2) P(IC,5)=PEF/COSH(P(IC,1))
+ 130 CONTINUE
+ ENDIF
+
+C...Remove cells below threshold.
+ IF(PARU(58).GT.0.) THEN
+ NCC=NC
+ NC=N
+ DO 140 IC=N+1,NCC
+ IF(P(IC,5).GT.PARU(58)) THEN
+ NC=NC+1
+ K(NC,3)=K(IC,3)
+ K(NC,4)=K(IC,4)
+ K(NC,5)=K(IC,5)
+ P(NC,1)=P(IC,1)
+ P(NC,2)=P(IC,2)
+ P(NC,5)=P(IC,5)
+ ENDIF
+ 140 CONTINUE
+ ENDIF
+
+C...Find initiator cell: the one with highest pT of not yet used ones.
+ NJ=NC
+ 150 ETMAX=0.
+ DO 160 IC=N+1,NC
+ IF(K(IC,5).NE.2) GOTO 160
+ IF(P(IC,5).LE.ETMAX) GOTO 160
+ ICMAX=IC
+ ETA=P(IC,1)
+ PHI=P(IC,2)
+ ETMAX=P(IC,5)
+ 160 CONTINUE
+ IF(ETMAX.LT.PARU(52)) GOTO 220
+ IF(NJ.GE.MSTU(4)-MSTU(32)-5) THEN
+ CALL LUERRM(11,'(LUCELL:) no more memory left in LUJETS')
+ NJET=-2
+ RETURN
+ ENDIF
+ K(ICMAX,5)=1
+ NJ=NJ+1
+ K(NJ,4)=0
+ K(NJ,5)=1
+ P(NJ,1)=ETA
+ P(NJ,2)=PHI
+ P(NJ,3)=0.
+ P(NJ,4)=0.
+ P(NJ,5)=0.
+
+C...Sum up unused cells within required distance of initiator.
+ DO 170 IC=N+1,NC
+ IF(K(IC,5).EQ.0) GOTO 170
+ IF(ABS(P(IC,1)-ETA).GT.PARU(54)) GOTO 170
+ DPHIA=ABS(P(IC,2)-PHI)
+ IF(DPHIA.GT.PARU(54).AND.DPHIA.LT.PARU(2)-PARU(54)) GOTO 170
+ PHIC=P(IC,2)
+ IF(DPHIA.GT.PARU(1)) PHIC=PHIC+SIGN(PARU(2),PHI)
+ IF((P(IC,1)-ETA)**2+(PHIC-PHI)**2.GT.PARU(54)**2) GOTO 170
+ K(IC,5)=-K(IC,5)
+ K(NJ,4)=K(NJ,4)+K(IC,4)
+ P(NJ,3)=P(NJ,3)+P(IC,5)*P(IC,1)
+ P(NJ,4)=P(NJ,4)+P(IC,5)*PHIC
+ P(NJ,5)=P(NJ,5)+P(IC,5)
+ 170 CONTINUE
+
+C...Reject cluster below minimum ET, else accept.
+ IF(P(NJ,5).LT.PARU(53)) THEN
+ NJ=NJ-1
+ DO 180 IC=N+1,NC
+ IF(K(IC,5).LT.0) K(IC,5)=-K(IC,5)
+ 180 CONTINUE
+ ELSEIF(MSTU(54).LE.2) THEN
+ P(NJ,3)=P(NJ,3)/P(NJ,5)
+ P(NJ,4)=P(NJ,4)/P(NJ,5)
+ IF(ABS(P(NJ,4)).GT.PARU(1)) P(NJ,4)=P(NJ,4)-SIGN(PARU(2),
+ & P(NJ,4))
+ DO 190 IC=N+1,NC
+ IF(K(IC,5).LT.0) K(IC,5)=0
+ 190 CONTINUE
+ ELSE
+ DO 200 J=1,4
+ P(NJ,J)=0.
+ 200 CONTINUE
+ DO 210 IC=N+1,NC
+ IF(K(IC,5).GE.0) GOTO 210
+ P(NJ,1)=P(NJ,1)+P(IC,5)*COS(P(IC,2))
+ P(NJ,2)=P(NJ,2)+P(IC,5)*SIN(P(IC,2))
+ P(NJ,3)=P(NJ,3)+P(IC,5)*SINH(P(IC,1))
+ P(NJ,4)=P(NJ,4)+P(IC,5)*COSH(P(IC,1))
+ K(IC,5)=0
+ 210 CONTINUE
+ ENDIF
+ GOTO 150
+
+C...Arrange clusters in falling ET sequence.
+ 220 DO 250 I=1,NJ-NC
+ ETMAX=0.
+ DO 230 IJ=NC+1,NJ
+ IF(K(IJ,5).EQ.0) GOTO 230
+ IF(P(IJ,5).LT.ETMAX) GOTO 230
+ IJMAX=IJ
+ ETMAX=P(IJ,5)
+ 230 CONTINUE
+ K(IJMAX,5)=0
+ K(N+I,1)=31
+ K(N+I,2)=98
+ K(N+I,3)=I
+ K(N+I,4)=K(IJMAX,4)
+ K(N+I,5)=0
+ DO 240 J=1,5
+ P(N+I,J)=P(IJMAX,J)
+ V(N+I,J)=0.
+ 240 CONTINUE
+ 250 CONTINUE
+ NJET=NJ-NC
+
+C...Convert to massless or massive four-vectors.
+ IF(MSTU(54).EQ.2) THEN
+ DO 260 I=N+1,N+NJET
+ ETA=P(I,3)
+ P(I,1)=P(I,5)*COS(P(I,4))
+ P(I,2)=P(I,5)*SIN(P(I,4))
+ P(I,3)=P(I,5)*SINH(ETA)
+ P(I,4)=P(I,5)*COSH(ETA)
+ P(I,5)=0.
+ 260 CONTINUE
+ ELSEIF(MSTU(54).GE.3) THEN
+ DO 270 I=N+1,N+NJET
+ P(I,5)=SQRT(MAX(0.D0,P(I,4)**2-P(I,1)**2-P(I,2)**2-P(I,3)**2))
+ 270 CONTINUE
+ ENDIF
+
+C...Information about storage.
+ MSTU(61)=N+1
+ MSTU(62)=NP
+ MSTU(63)=NC-N
+ IF(MSTU(43).LE.1) MSTU(3)=NJET
+ IF(MSTU(43).GE.2) N=N+NJET
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUJMAS
+ SUBROUTINE LUJMAS(PMH,PML)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to determine, approximately, the two jet masses that
+C...minimize the sum m_H^2 + m_L^2, a la Clavelli and Wyler.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+ DIMENSION SM(3,3),SAX(3),PS(3,5)
+
+C...Reset.
+ NP=0
+ DO 120 J1=1,3
+ DO 100 J2=J1,3
+ SM(J1,J2)=0.
+ 100 CONTINUE
+ DO 110 J2=1,4
+ PS(J1,J2)=0.
+ 110 CONTINUE
+ 120 CONTINUE
+ PSS=0.
+
+C...Take copy of particles that are to be considered in mass analysis.
+ DO 170 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 170
+ IF(MSTU(41).GE.2) THEN
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR.
+ & KC.EQ.18) GOTO 170
+ IF(MSTU(41).GE.3.AND.KCHG(KC,2).EQ.0.AND.LUCHGE(K(I,2)).EQ.0)
+ & GOTO 170
+ ENDIF
+ IF(N+NP+1.GE.MSTU(4)-MSTU(32)-5) THEN
+ CALL LUERRM(11,'(LUJMAS:) no more memory left in LUJETS')
+ PMH=-2.
+ PML=-2.
+ RETURN
+ ENDIF
+ NP=NP+1
+ DO 130 J=1,5
+ P(N+NP,J)=P(I,J)
+ 130 CONTINUE
+ IF(MSTU(42).EQ.0) P(N+NP,5)=0.
+ IF(MSTU(42).EQ.1.AND.K(I,2).NE.22) P(N+NP,5)=PMAS(101,1)
+ P(N+NP,4)=SQRT(P(N+NP,5)**2+P(I,1)**2+P(I,2)**2+P(I,3)**2)
+
+C...Fill information in sphericity tensor and total momentum vector.
+ DO 150 J1=1,3
+ DO 140 J2=J1,3
+ SM(J1,J2)=SM(J1,J2)+P(I,J1)*P(I,J2)
+ 140 CONTINUE
+ 150 CONTINUE
+ PSS=PSS+(P(I,1)**2+P(I,2)**2+P(I,3)**2)
+ DO 160 J=1,4
+ PS(3,J)=PS(3,J)+P(N+NP,J)
+ 160 CONTINUE
+ 170 CONTINUE
+
+C...Very low multiplicities (0 or 1) not considered.
+ IF(NP.LE.1) THEN
+ CALL LUERRM(8,'(LUJMAS:) too few particles for analysis')
+ PMH=-1.
+ PML=-1.
+ RETURN
+ ENDIF
+ PARU(61)=
+ &SQRT(MAX(0.D0,PS(3,4)**2-PS(3,1)**2-PS(3,2)**2-PS(3,3)**2))
+
+C...Find largest eigenvalue to matrix (third degree equation).
+ DO 190 J1=1,3
+ DO 180 J2=J1,3
+ SM(J1,J2)=SM(J1,J2)/PSS
+ 180 CONTINUE
+ 190 CONTINUE
+ SQ=(SM(1,1)*SM(2,2)+SM(1,1)*SM(3,3)+SM(2,2)*SM(3,3)-SM(1,2)**2-
+ &SM(1,3)**2-SM(2,3)**2)/3.-1./9.
+ SR=-0.5*(SQ+1./9.+SM(1,1)*SM(2,3)**2+SM(2,2)*SM(1,3)**2+SM(3,3)*
+ &SM(1,2)**2-SM(1,1)*SM(2,2)*SM(3,3))+SM(1,2)*SM(1,3)*SM(2,3)+1./27.
+ SP=COS(ACOS(MAX(MIN(SR/SQRT(-SQ**3),1.D0),-1.D0))/3.)
+ SMA=1./3.+SQRT(-SQ)*MAX(2.*SP,SQRT(3.*(1.-SP**2))-SP)
+
+C...Find largest eigenvector by solving equation system.
+ DO 210 J1=1,3
+ SM(J1,J1)=SM(J1,J1)-SMA
+ DO 200 J2=J1+1,3
+ SM(J2,J1)=SM(J1,J2)
+ 200 CONTINUE
+ 210 CONTINUE
+ SMAX=0.
+ DO 230 J1=1,3
+ DO 220 J2=1,3
+ IF(ABS(SM(J1,J2)).LE.SMAX) GOTO 220
+ JA=J1
+ JB=J2
+ SMAX=ABS(SM(J1,J2))
+ 220 CONTINUE
+ 230 CONTINUE
+ SMAX=0.
+ DO 250 J3=JA+1,JA+2
+ J1=J3-3*((J3-1)/3)
+ RL=SM(J1,JB)/SM(JA,JB)
+ DO 240 J2=1,3
+ SM(J1,J2)=SM(J1,J2)-RL*SM(JA,J2)
+ IF(ABS(SM(J1,J2)).LE.SMAX) GOTO 240
+ JC=J1
+ SMAX=ABS(SM(J1,J2))
+ 240 CONTINUE
+ 250 CONTINUE
+ JB1=JB+1-3*(JB/3)
+ JB2=JB+2-3*((JB+1)/3)
+ SAX(JB1)=-SM(JC,JB2)
+ SAX(JB2)=SM(JC,JB1)
+ SAX(JB)=-(SM(JA,JB1)*SAX(JB1)+SM(JA,JB2)*SAX(JB2))/SM(JA,JB)
+
+C...Divide particles into two initial clusters by hemisphere.
+ DO 270 I=N+1,N+NP
+ PSAX=P(I,1)*SAX(1)+P(I,2)*SAX(2)+P(I,3)*SAX(3)
+ IS=1
+ IF(PSAX.LT.0.) IS=2
+ K(I,3)=IS
+ DO 260 J=1,4
+ PS(IS,J)=PS(IS,J)+P(I,J)
+ 260 CONTINUE
+ 270 CONTINUE
+ PMS=MAX(1D-10,PS(1,4)**2-PS(1,1)**2-PS(1,2)**2-PS(1,3)**2)+
+ &MAX(1D-10,PS(2,4)**2-PS(2,1)**2-PS(2,2)**2-PS(2,3)**2)
+
+C...Reassign one particle at a time; find maximum decrease of m^2 sum.
+ 280 PMD=0.
+ IM=0
+ DO 290 J=1,4
+ PS(3,J)=PS(1,J)-PS(2,J)
+ 290 CONTINUE
+ DO 300 I=N+1,N+NP
+ PPS=P(I,4)*PS(3,4)-P(I,1)*PS(3,1)-P(I,2)*PS(3,2)-P(I,3)*PS(3,3)
+ IF(K(I,3).EQ.1) PMDI=2.*(P(I,5)**2-PPS)
+ IF(K(I,3).EQ.2) PMDI=2.*(P(I,5)**2+PPS)
+ IF(PMDI.LT.PMD) THEN
+ PMD=PMDI
+ IM=I
+ ENDIF
+ 300 CONTINUE
+
+C...Loop back if significant reduction in sum of m^2.
+ IF(PMD.LT.-PARU(48)*PMS) THEN
+ PMS=PMS+PMD
+ IS=K(IM,3)
+ DO 310 J=1,4
+ PS(IS,J)=PS(IS,J)-P(IM,J)
+ PS(3-IS,J)=PS(3-IS,J)+P(IM,J)
+ 310 CONTINUE
+ K(IM,3)=3-IS
+ GOTO 280
+ ENDIF
+
+C...Final masses and output.
+ MSTU(61)=N+1
+ MSTU(62)=NP
+ PS(1,5)=
+ &SQRT(MAX(0.D0,PS(1,4)**2-PS(1,1)**2-PS(1,2)**2-PS(1,3)**2))
+ PS(2,5)=
+ &SQRT(MAX(0.D0,PS(2,4)**2-PS(2,1)**2-PS(2,2)**2-PS(2,3)**2))
+ PMH=MAX(PS(1,5),PS(2,5))
+ PML=MIN(PS(1,5),PS(2,5))
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUFOWO
+ SUBROUTINE LUFOWO(H10,H20,H30,H40)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to calculate the first few Fox-Wolfram moments.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+
+C...Copy momenta for particles and calculate H0.
+ NP=0
+ H0=0.
+ HD=0.
+ DO 110 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 110
+ IF(MSTU(41).GE.2) THEN
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR.
+ & KC.EQ.18) GOTO 110
+ IF(MSTU(41).GE.3.AND.KCHG(KC,2).EQ.0.AND.LUCHGE(K(I,2)).EQ.0)
+ & GOTO 110
+ ENDIF
+ IF(N+NP.GE.MSTU(4)-MSTU(32)-5) THEN
+ CALL LUERRM(11,'(LUFOWO:) no more memory left in LUJETS')
+ H10=-1.
+ H20=-1.
+ H30=-1.
+ H40=-1.
+ RETURN
+ ENDIF
+ NP=NP+1
+ DO 100 J=1,3
+ P(N+NP,J)=P(I,J)
+ 100 CONTINUE
+ P(N+NP,4)=SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2)
+ H0=H0+P(N+NP,4)
+ HD=HD+P(N+NP,4)**2
+ 110 CONTINUE
+ H0=H0**2
+
+C...Very low multiplicities (0 or 1) not considered.
+ IF(NP.LE.1) THEN
+ CALL LUERRM(8,'(LUFOWO:) too few particles for analysis')
+ H10=-1.
+ H20=-1.
+ H30=-1.
+ H40=-1.
+ RETURN
+ ENDIF
+
+C...Calculate H1 - H4.
+ H10=0.
+ H20=0.
+ H30=0.
+ H40=0.
+ DO 130 I1=N+1,N+NP
+ DO 120 I2=I1+1,N+NP
+ CTHE=(P(I1,1)*P(I2,1)+P(I1,2)*P(I2,2)+P(I1,3)*P(I2,3))/
+ &(P(I1,4)*P(I2,4))
+ H10=H10+P(I1,4)*P(I2,4)*CTHE
+ H20=H20+P(I1,4)*P(I2,4)*(1.5*CTHE**2-0.5)
+ H30=H30+P(I1,4)*P(I2,4)*(2.5*CTHE**3-1.5*CTHE)
+ H40=H40+P(I1,4)*P(I2,4)*(4.375*CTHE**4-3.75*CTHE**2+0.375)
+ 120 CONTINUE
+ 130 CONTINUE
+
+C...Calculate H1/H0 - H4/H0. Output.
+ MSTU(61)=N+1
+ MSTU(62)=NP
+ H10=(HD+2.*H10)/H0
+ H20=(HD+2.*H20)/H0
+ H30=(HD+2.*H30)/H0
+ H40=(HD+2.*H40)/H0
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUTABU
+ SUBROUTINE LUTABU(MTABU)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to evaluate various properties of an event, with
+C...statistics accumulated during the course of the run and
+C...printed at the end.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/,/LUDAT3/
+ DIMENSION KFIS(100,2),NPIS(100,0:10),KFFS(400),NPFS(400,4),
+ &FEVFM(10,4),FM1FM(3,10,4),FM2FM(3,10,4),FMOMA(4),FMOMS(4),
+ &FEVEE(50),FE1EC(50),FE2EC(50),FE1EA(25),FE2EA(25),
+ &KFDM(8),KFDC(200,0:8),NPDC(200)
+ SAVE NEVIS,NKFIS,KFIS,NPIS,NEVFS,NPRFS,NFIFS,NCHFS,NKFFS,
+ &KFFS,NPFS,NEVFM,NMUFM,FM1FM,FM2FM,NEVEE,FE1EC,FE2EC,FE1EA,
+ &FE2EA,NEVDC,NKFDC,NREDC,KFDC,NPDC
+ CHARACTER CHAU*16,CHIS(2)*12,CHDC(8)*12
+ DATA NEVIS/0/,NKFIS/0/,NEVFS/0/,NPRFS/0/,NFIFS/0/,NCHFS/0/,
+ &NKFFS/0/,NEVFM/0/,NMUFM/0/,FM1FM/120*0./,FM2FM/120*0./,
+ &NEVEE/0/,FE1EC/50*0./,FE2EC/50*0./,FE1EA/25*0./,FE2EA/25*0./,
+ &NEVDC/0/,NKFDC/0/,NREDC/0/
+
+C...Reset statistics on initial parton state.
+ IF(MTABU.EQ.10) THEN
+ NEVIS=0
+ NKFIS=0
+
+C...Identify and order flavour content of initial state.
+ ELSEIF(MTABU.EQ.11) THEN
+ NEVIS=NEVIS+1
+ KFM1=2*IABS(MSTU(161))
+ IF(MSTU(161).GT.0) KFM1=KFM1-1
+ KFM2=2*IABS(MSTU(162))
+ IF(MSTU(162).GT.0) KFM2=KFM2-1
+ KFMN=MIN(KFM1,KFM2)
+ KFMX=MAX(KFM1,KFM2)
+ DO 100 I=1,NKFIS
+ IF(KFMN.EQ.KFIS(I,1).AND.KFMX.EQ.KFIS(I,2)) THEN
+ IKFIS=-I
+ GOTO 110
+ ELSEIF(KFMN.LT.KFIS(I,1).OR.(KFMN.EQ.KFIS(I,1).AND.
+ & KFMX.LT.KFIS(I,2))) THEN
+ IKFIS=I
+ GOTO 110
+ ENDIF
+ 100 CONTINUE
+ IKFIS=NKFIS+1
+ 110 IF(IKFIS.LT.0) THEN
+ IKFIS=-IKFIS
+ ELSE
+ IF(NKFIS.GE.100) RETURN
+ DO 130 I=NKFIS,IKFIS,-1
+ KFIS(I+1,1)=KFIS(I,1)
+ KFIS(I+1,2)=KFIS(I,2)
+ DO 120 J=0,10
+ NPIS(I+1,J)=NPIS(I,J)
+ 120 CONTINUE
+ 130 CONTINUE
+ NKFIS=NKFIS+1
+ KFIS(IKFIS,1)=KFMN
+ KFIS(IKFIS,2)=KFMX
+ DO 140 J=0,10
+ NPIS(IKFIS,J)=0
+ 140 CONTINUE
+ ENDIF
+ NPIS(IKFIS,0)=NPIS(IKFIS,0)+1
+
+C...Count number of partons in initial state.
+ NP=0
+ DO 160 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.12) THEN
+ ELSEIF(IABS(K(I,2)).GT.80.AND.IABS(K(I,2)).LE.100) THEN
+ ELSEIF(IABS(K(I,2)).GT.100.AND.MOD(IABS(K(I,2))/10,10).NE.0)
+ & THEN
+ ELSE
+ IM=I
+ 150 IM=K(IM,3)
+ IF(IM.LE.0.OR.IM.GT.N) THEN
+ NP=NP+1
+ ELSEIF(K(IM,1).LE.0.OR.K(IM,1).GT.20) THEN
+ NP=NP+1
+ ELSEIF(IABS(K(IM,2)).GT.80.AND.IABS(K(IM,2)).LE.100) THEN
+ ELSEIF(IABS(K(IM,2)).GT.100.AND.MOD(IABS(K(IM,2))/10,10).NE.0)
+ & THEN
+ ELSE
+ GOTO 150
+ ENDIF
+ ENDIF
+ 160 CONTINUE
+ NPCO=MAX(NP,1)
+ IF(NP.GE.6) NPCO=6
+ IF(NP.GE.8) NPCO=7
+ IF(NP.GE.11) NPCO=8
+ IF(NP.GE.16) NPCO=9
+ IF(NP.GE.26) NPCO=10
+ NPIS(IKFIS,NPCO)=NPIS(IKFIS,NPCO)+1
+ MSTU(62)=NP
+
+C...Write statistics on initial parton state.
+ ELSEIF(MTABU.EQ.12) THEN
+ FAC=1./MAX(1,NEVIS)
+ WRITE(MSTU(11),5000) NEVIS
+ DO 170 I=1,NKFIS
+ KFMN=KFIS(I,1)
+ IF(KFMN.EQ.0) KFMN=KFIS(I,2)
+ KFM1=(KFMN+1)/2
+ IF(2*KFM1.EQ.KFMN) KFM1=-KFM1
+ CALL LUNAME(KFM1,CHAU)
+ CHIS(1)=CHAU(1:12)
+ IF(CHAU(13:13).NE.' ') CHIS(1)(12:12)='?'
+ KFMX=KFIS(I,2)
+ IF(KFIS(I,1).EQ.0) KFMX=0
+ KFM2=(KFMX+1)/2
+ IF(2*KFM2.EQ.KFMX) KFM2=-KFM2
+ CALL LUNAME(KFM2,CHAU)
+ CHIS(2)=CHAU(1:12)
+ IF(CHAU(13:13).NE.' ') CHIS(2)(12:12)='?'
+ WRITE(MSTU(11),5100) CHIS(1),CHIS(2),FAC*NPIS(I,0),
+ & (NPIS(I,J)/ DBLE(NPIS(I,0)),J=1,10)
+ 170 CONTINUE
+
+C...Copy statistics on initial parton state into /LUJETS/.
+ ELSEIF(MTABU.EQ.13) THEN
+ FAC=1./MAX(1,NEVIS)
+ DO 190 I=1,NKFIS
+ KFMN=KFIS(I,1)
+ IF(KFMN.EQ.0) KFMN=KFIS(I,2)
+ KFM1=(KFMN+1)/2
+ IF(2*KFM1.EQ.KFMN) KFM1=-KFM1
+ KFMX=KFIS(I,2)
+ IF(KFIS(I,1).EQ.0) KFMX=0
+ KFM2=(KFMX+1)/2
+ IF(2*KFM2.EQ.KFMX) KFM2=-KFM2
+ K(I,1)=32
+ K(I,2)=99
+ K(I,3)=KFM1
+ K(I,4)=KFM2
+ K(I,5)=NPIS(I,0)
+ DO 180 J=1,5
+ P(I,J)=FAC*NPIS(I,J)
+ V(I,J)=FAC*NPIS(I,J+5)
+ 180 CONTINUE
+ 190 CONTINUE
+ N=NKFIS
+ DO 200 J=1,5
+ K(N+1,J)=0
+ P(N+1,J)=0.
+ V(N+1,J)=0.
+ 200 CONTINUE
+ K(N+1,1)=32
+ K(N+1,2)=99
+ K(N+1,5)=NEVIS
+ MSTU(3)=1
+
+C...Reset statistics on number of particles/partons.
+ ELSEIF(MTABU.EQ.20) THEN
+ NEVFS=0
+ NPRFS=0
+ NFIFS=0
+ NCHFS=0
+ NKFFS=0
+
+C...Identify whether particle/parton is primary or not.
+ ELSEIF(MTABU.EQ.21) THEN
+ NEVFS=NEVFS+1
+ MSTU(62)=0
+ DO 260 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.20.OR.K(I,1).EQ.13) GOTO 260
+ MSTU(62)=MSTU(62)+1
+ KC=LUCOMP(K(I,2))
+ MPRI=0
+ IF(K(I,3).LE.0.OR.K(I,3).GT.N) THEN
+ MPRI=1
+ ELSEIF(K(K(I,3),1).LE.0.OR.K(K(I,3),1).GT.20) THEN
+ MPRI=1
+ ELSEIF(K(K(I,3),2).GE.91.AND.K(K(I,3),2).LE.93) THEN
+ MPRI=1
+ ELSEIF(KC.EQ.0) THEN
+ ELSEIF(K(K(I,3),1).EQ.13) THEN
+ IM=K(K(I,3),3)
+ IF(IM.LE.0.OR.IM.GT.N) THEN
+ MPRI=1
+ ELSEIF(K(IM,1).LE.0.OR.K(IM,1).GT.20) THEN
+ MPRI=1
+ ENDIF
+ ELSEIF(KCHG(KC,2).EQ.0) THEN
+ KCM=LUCOMP(K(K(I,3),2))
+ IF(KCM.NE.0) THEN
+ IF(KCHG(KCM,2).NE.0) MPRI=1
+ ENDIF
+ ENDIF
+ IF(KC.NE.0.AND.MPRI.EQ.1) THEN
+ IF(KCHG(KC,2).EQ.0) NPRFS=NPRFS+1
+ ENDIF
+ IF(K(I,1).LE.10) THEN
+ NFIFS=NFIFS+1
+ IF(LUCHGE(K(I,2)).NE.0) NCHFS=NCHFS+1
+ ENDIF
+
+C...Fill statistics on number of particles/partons in event.
+ KFA=IABS(K(I,2))
+ KFS=3-ISIGN(1,K(I,2))-MPRI
+ DO 210 IP=1,NKFFS
+ IF(KFA.EQ.KFFS(IP)) THEN
+ IKFFS=-IP
+ GOTO 220
+ ELSEIF(KFA.LT.KFFS(IP)) THEN
+ IKFFS=IP
+ GOTO 220
+ ENDIF
+ 210 CONTINUE
+ IKFFS=NKFFS+1
+ 220 IF(IKFFS.LT.0) THEN
+ IKFFS=-IKFFS
+ ELSE
+ IF(NKFFS.GE.400) RETURN
+ DO 240 IP=NKFFS,IKFFS,-1
+ KFFS(IP+1)=KFFS(IP)
+ DO 230 J=1,4
+ NPFS(IP+1,J)=NPFS(IP,J)
+ 230 CONTINUE
+ 240 CONTINUE
+ NKFFS=NKFFS+1
+ KFFS(IKFFS)=KFA
+ DO 250 J=1,4
+ NPFS(IKFFS,J)=0
+ 250 CONTINUE
+ ENDIF
+ NPFS(IKFFS,KFS)=NPFS(IKFFS,KFS)+1
+ 260 CONTINUE
+
+C...Write statistics on particle/parton composition of events.
+ ELSEIF(MTABU.EQ.22) THEN
+ FAC=1./MAX(1,NEVFS)
+ WRITE(MSTU(11),5200) NEVFS,FAC*NPRFS,FAC*NFIFS,FAC*NCHFS
+ DO 270 I=1,NKFFS
+ CALL LUNAME(KFFS(I),CHAU)
+ KC=LUCOMP(KFFS(I))
+ MDCYF=0
+ IF(KC.NE.0) MDCYF=MDCY(KC,1)
+ WRITE(MSTU(11),5300) KFFS(I),CHAU,MDCYF,(FAC*NPFS(I,J),J=1,4),
+ & FAC*(NPFS(I,1)+NPFS(I,2)+NPFS(I,3)+NPFS(I,4))
+ 270 CONTINUE
+
+C...Copy particle/parton composition information into /LUJETS/.
+ ELSEIF(MTABU.EQ.23) THEN
+ FAC=1./MAX(1,NEVFS)
+ DO 290 I=1,NKFFS
+ K(I,1)=32
+ K(I,2)=99
+ K(I,3)=KFFS(I)
+ K(I,4)=0
+ K(I,5)=NPFS(I,1)+NPFS(I,2)+NPFS(I,3)+NPFS(I,4)
+ DO 280 J=1,4
+ P(I,J)=FAC*NPFS(I,J)
+ V(I,J)=0.
+ 280 CONTINUE
+ P(I,5)=FAC*K(I,5)
+ V(I,5)=0.
+ 290 CONTINUE
+ N=NKFFS
+ DO 300 J=1,5
+ K(N+1,J)=0
+ P(N+1,J)=0.
+ V(N+1,J)=0.
+ 300 CONTINUE
+ K(N+1,1)=32
+ K(N+1,2)=99
+ K(N+1,5)=NEVFS
+ P(N+1,1)=FAC*NPRFS
+ P(N+1,2)=FAC*NFIFS
+ P(N+1,3)=FAC*NCHFS
+ MSTU(3)=1
+
+C...Reset factorial moments statistics.
+ ELSEIF(MTABU.EQ.30) THEN
+ NEVFM=0
+ NMUFM=0
+ DO 330 IM=1,3
+ DO 320 IB=1,10
+ DO 310 IP=1,4
+ FM1FM(IM,IB,IP)=0.
+ FM2FM(IM,IB,IP)=0.
+ 310 CONTINUE
+ 320 CONTINUE
+ 330 CONTINUE
+
+C...Find particles to include, with (pion,pseudo)rapidity and azimuth.
+ ELSEIF(MTABU.EQ.31) THEN
+ NEVFM=NEVFM+1
+ NLOW=N+MSTU(3)
+ NUPP=NLOW
+ DO 410 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 410
+ IF(MSTU(41).GE.2) THEN
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR.
+ & KC.EQ.18) GOTO 410
+ IF(MSTU(41).GE.3.AND.KCHG(KC,2).EQ.0.AND.LUCHGE(K(I,2)).EQ.0)
+ & GOTO 410
+ ENDIF
+ PMR=0.
+ IF(MSTU(42).EQ.1.AND.K(I,2).NE.22) PMR=ULMASS(211)
+ IF(MSTU(42).GE.2) PMR=P(I,5)
+ PR=MAX(1D-20,PMR**2+P(I,1)**2+P(I,2)**2)
+ YETA=SIGN(LOG(MIN((SQRT(PR+P(I,3)**2)+ABS(P(I,3)))/SQRT(PR),
+ & 1D20)),P(I,3))
+ IF(ABS(YETA).GT.PARU(57)) GOTO 410
+ PHI=ULANGL(P(I,1),P(I,2))
+ IYETA=512.*(YETA+PARU(57))/(2.*PARU(57))
+ IYETA=MAX(0,MIN(511,IYETA))
+ IPHI=512.*(PHI+PARU(1))/PARU(2)
+ IPHI=MAX(0,MIN(511,IPHI))
+ IYEP=0
+ DO 340 IB=0,9
+ IYEP=IYEP+4**IB*(2*MOD(IYETA/2**IB,2)+MOD(IPHI/2**IB,2))
+ 340 CONTINUE
+
+C...Order particles in (pseudo)rapidity and/or azimuth.
+ IF(NUPP.GT.MSTU(4)-5-MSTU(32)) THEN
+ CALL LUERRM(11,'(LUTABU:) no more memory left in LUJETS')
+ RETURN
+ ENDIF
+ NUPP=NUPP+1
+ IF(NUPP.EQ.NLOW+1) THEN
+ K(NUPP,1)=IYETA
+ K(NUPP,2)=IPHI
+ K(NUPP,3)=IYEP
+ ELSE
+ DO 350 I1=NUPP-1,NLOW+1,-1
+ IF(IYETA.GE.K(I1,1)) GOTO 360
+ K(I1+1,1)=K(I1,1)
+ 350 CONTINUE
+ 360 K(I1+1,1)=IYETA
+ DO 370 I1=NUPP-1,NLOW+1,-1
+ IF(IPHI.GE.K(I1,2)) GOTO 380
+ K(I1+1,2)=K(I1,2)
+ 370 CONTINUE
+ 380 K(I1+1,2)=IPHI
+ DO 390 I1=NUPP-1,NLOW+1,-1
+ IF(IYEP.GE.K(I1,3)) GOTO 400
+ K(I1+1,3)=K(I1,3)
+ 390 CONTINUE
+ 400 K(I1+1,3)=IYEP
+ ENDIF
+ 410 CONTINUE
+ K(NUPP+1,1)=2**10
+ K(NUPP+1,2)=2**10
+ K(NUPP+1,3)=4**10
+
+C...Calculate sum of factorial moments in event.
+ DO 480 IM=1,3
+ DO 430 IB=1,10
+ DO 420 IP=1,4
+ FEVFM(IB,IP)=0.
+ 420 CONTINUE
+ 430 CONTINUE
+ DO 450 IB=1,10
+ IF(IM.LE.2) IBIN=2**(10-IB)
+ IF(IM.EQ.3) IBIN=4**(10-IB)
+ IAGR=K(NLOW+1,IM)/IBIN
+ NAGR=1
+ DO 440 I=NLOW+2,NUPP+1
+ ICUT=K(I,IM)/IBIN
+ IF(ICUT.EQ.IAGR) THEN
+ NAGR=NAGR+1
+ ELSE
+ IF(NAGR.EQ.1) THEN
+ ELSEIF(NAGR.EQ.2) THEN
+ FEVFM(IB,1)=FEVFM(IB,1)+2.
+ ELSEIF(NAGR.EQ.3) THEN
+ FEVFM(IB,1)=FEVFM(IB,1)+6.
+ FEVFM(IB,2)=FEVFM(IB,2)+6.
+ ELSEIF(NAGR.EQ.4) THEN
+ FEVFM(IB,1)=FEVFM(IB,1)+12.
+ FEVFM(IB,2)=FEVFM(IB,2)+24.
+ FEVFM(IB,3)=FEVFM(IB,3)+24.
+ ELSE
+ FEVFM(IB,1)=FEVFM(IB,1)+NAGR*(NAGR-1.)
+ FEVFM(IB,2)=FEVFM(IB,2)+NAGR*(NAGR-1.)*(NAGR-2.)
+ FEVFM(IB,3)=FEVFM(IB,3)+NAGR*(NAGR-1.)*(NAGR-2.)*(NAGR-3.)
+ FEVFM(IB,4)=FEVFM(IB,4)+NAGR*(NAGR-1.)*(NAGR-2.)*(NAGR-3.)*
+ & (NAGR-4.)
+ ENDIF
+ IAGR=ICUT
+ NAGR=1
+ ENDIF
+ 440 CONTINUE
+ 450 CONTINUE
+
+C...Add results to total statistics.
+ DO 470 IB=10,1,-1
+ DO 460 IP=1,4
+ IF(FEVFM(1,IP).LT.0.5) THEN
+ FEVFM(IB,IP)=0.
+ ELSEIF(IM.LE.2) THEN
+ FEVFM(IB,IP)=2.**((IB-1)*IP)*FEVFM(IB,IP)/FEVFM(1,IP)
+ ELSE
+ FEVFM(IB,IP)=4.**((IB-1)*IP)*FEVFM(IB,IP)/FEVFM(1,IP)
+ ENDIF
+ FM1FM(IM,IB,IP)=FM1FM(IM,IB,IP)+FEVFM(IB,IP)
+ FM2FM(IM,IB,IP)=FM2FM(IM,IB,IP)+FEVFM(IB,IP)**2
+ 460 CONTINUE
+ 470 CONTINUE
+ 480 CONTINUE
+ NMUFM=NMUFM+(NUPP-NLOW)
+ MSTU(62)=NUPP-NLOW
+
+C...Write accumulated statistics on factorial moments.
+ ELSEIF(MTABU.EQ.32) THEN
+ FAC=1./MAX(1,NEVFM)
+ IF(MSTU(42).LE.0) WRITE(MSTU(11),5400) NEVFM,'eta'
+ IF(MSTU(42).EQ.1) WRITE(MSTU(11),5400) NEVFM,'ypi'
+ IF(MSTU(42).GE.2) WRITE(MSTU(11),5400) NEVFM,'y '
+ DO 510 IM=1,3
+ WRITE(MSTU(11),5500)
+ DO 500 IB=1,10
+ BYETA=2.*PARU(57)
+ IF(IM.NE.2) BYETA=BYETA/2**(IB-1)
+ BPHI=PARU(2)
+ IF(IM.NE.1) BPHI=BPHI/2**(IB-1)
+ IF(IM.LE.2) BNAVE=FAC*NMUFM/ DBLE(2**(IB-1))
+ IF(IM.EQ.3) BNAVE=FAC*NMUFM/ DBLE(4**(IB-1))
+ DO 490 IP=1,4
+ FMOMA(IP)=FAC*FM1FM(IM,IB,IP)
+ FMOMS(IP)=SQRT(MAX(0.D0,FAC*(FAC*FM2FM(IM,IB,IP)-FMOMA(IP)**2)))
+ 490 CONTINUE
+ WRITE(MSTU(11),5600) BYETA,BPHI,BNAVE,(FMOMA(IP),FMOMS(IP),
+ & IP=1,4)
+ 500 CONTINUE
+ 510 CONTINUE
+
+C...Copy statistics on factorial moments into /LUJETS/.
+ ELSEIF(MTABU.EQ.33) THEN
+ FAC=1./MAX(1,NEVFM)
+ DO 540 IM=1,3
+ DO 530 IB=1,10
+ I=10*(IM-1)+IB
+ K(I,1)=32
+ K(I,2)=99
+ K(I,3)=1
+ IF(IM.NE.2) K(I,3)=2**(IB-1)
+ K(I,4)=1
+ IF(IM.NE.1) K(I,4)=2**(IB-1)
+ K(I,5)=0
+ P(I,1)=2.*PARU(57)/K(I,3)
+ V(I,1)=PARU(2)/K(I,4)
+ DO 520 IP=1,4
+ P(I,IP+1)=FAC*FM1FM(IM,IB,IP)
+ V(I,IP+1)=SQRT(MAX(0.D0,FAC*(FAC*FM2FM(IM,IB,IP)-P(I,IP+1)**2)))
+ 520 CONTINUE
+ 530 CONTINUE
+ 540 CONTINUE
+ N=30
+ DO 550 J=1,5
+ K(N+1,J)=0
+ P(N+1,J)=0.
+ V(N+1,J)=0.
+ 550 CONTINUE
+ K(N+1,1)=32
+ K(N+1,2)=99
+ K(N+1,5)=NEVFM
+ MSTU(3)=1
+
+C...Reset statistics on Energy-Energy Correlation.
+ ELSEIF(MTABU.EQ.40) THEN
+ NEVEE=0
+ DO 560 J=1,25
+ FE1EC(J)=0.
+ FE2EC(J)=0.
+ FE1EC(51-J)=0.
+ FE2EC(51-J)=0.
+ FE1EA(J)=0.
+ FE2EA(J)=0.
+ 560 CONTINUE
+
+C...Find particles to include, with proper assumed mass.
+ ELSEIF(MTABU.EQ.41) THEN
+ NEVEE=NEVEE+1
+ NLOW=N+MSTU(3)
+ NUPP=NLOW
+ ECM=0.
+ DO 570 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GT.10) GOTO 570
+ IF(MSTU(41).GE.2) THEN
+ KC=LUCOMP(K(I,2))
+ IF(KC.EQ.0.OR.KC.EQ.12.OR.KC.EQ.14.OR.KC.EQ.16.OR.
+ & KC.EQ.18) GOTO 570
+ IF(MSTU(41).GE.3.AND.KCHG(KC,2).EQ.0.AND.LUCHGE(K(I,2)).EQ.0)
+ & GOTO 570
+ ENDIF
+ PMR=0.
+ IF(MSTU(42).EQ.1.AND.K(I,2).NE.22) PMR=ULMASS(211)
+ IF(MSTU(42).GE.2) PMR=P(I,5)
+ IF(NUPP.GT.MSTU(4)-5-MSTU(32)) THEN
+ CALL LUERRM(11,'(LUTABU:) no more memory left in LUJETS')
+ RETURN
+ ENDIF
+ NUPP=NUPP+1
+ P(NUPP,1)=P(I,1)
+ P(NUPP,2)=P(I,2)
+ P(NUPP,3)=P(I,3)
+ P(NUPP,4)=SQRT(PMR**2+P(I,1)**2+P(I,2)**2+P(I,3)**2)
+ P(NUPP,5)=MAX(1D-10,SQRT(P(I,1)**2+P(I,2)**2+P(I,3)**2))
+ ECM=ECM+P(NUPP,4)
+ 570 CONTINUE
+ IF(NUPP.EQ.NLOW) RETURN
+
+C...Analyze Energy-Energy Correlation in event.
+ FAC=(2./ECM**2)*50./PARU(1)
+ DO 580 J=1,50
+ FEVEE(J)=0.
+ 580 CONTINUE
+ DO 600 I1=NLOW+2,NUPP
+ DO 590 I2=NLOW+1,I1-1
+ CTHE=(P(I1,1)*P(I2,1)+P(I1,2)*P(I2,2)+P(I1,3)*P(I2,3))/
+ & (P(I1,5)*P(I2,5))
+ THE=ACOS(MAX(-1.D0,MIN(1.D0,CTHE)))
+ ITHE=MAX(1,MIN(50,1+INT(50.*THE/PARU(1))))
+ FEVEE(ITHE)=FEVEE(ITHE)+FAC*P(I1,4)*P(I2,4)
+ 590 CONTINUE
+ 600 CONTINUE
+ DO 610 J=1,25
+ FE1EC(J)=FE1EC(J)+FEVEE(J)
+ FE2EC(J)=FE2EC(J)+FEVEE(J)**2
+ FE1EC(51-J)=FE1EC(51-J)+FEVEE(51-J)
+ FE2EC(51-J)=FE2EC(51-J)+FEVEE(51-J)**2
+ FE1EA(J)=FE1EA(J)+(FEVEE(51-J)-FEVEE(J))
+ FE2EA(J)=FE2EA(J)+(FEVEE(51-J)-FEVEE(J))**2
+ 610 CONTINUE
+ MSTU(62)=NUPP-NLOW
+
+C...Write statistics on Energy-Energy Correlation.
+ ELSEIF(MTABU.EQ.42) THEN
+ FAC=1./MAX(1,NEVEE)
+ WRITE(MSTU(11),5700) NEVEE
+ DO 620 J=1,25
+ FEEC1=FAC*FE1EC(J)
+ FEES1=SQRT(MAX(0.D0,FAC*(FAC*FE2EC(J)-FEEC1**2)))
+ FEEC2=FAC*FE1EC(51-J)
+ FEES2=SQRT(MAX(0.D0,FAC*(FAC*FE2EC(51-J)-FEEC2**2)))
+ FEECA=FAC*FE1EA(J)
+ FEESA=SQRT(MAX(0.D0,FAC*(FAC*FE2EA(J)-FEECA**2)))
+ WRITE(MSTU(11),5800) 3.6*(J-1),3.6*J,FEEC1,FEES1,FEEC2,FEES2,
+ & FEECA,FEESA
+ 620 CONTINUE
+
+C...Copy statistics on Energy-Energy Correlation into /LUJETS/.
+ ELSEIF(MTABU.EQ.43) THEN
+ FAC=1./MAX(1,NEVEE)
+ DO 630 I=1,25
+ K(I,1)=32
+ K(I,2)=99
+ K(I,3)=0
+ K(I,4)=0
+ K(I,5)=0
+ P(I,1)=FAC*FE1EC(I)
+ V(I,1)=SQRT(MAX(0.D0,FAC*(FAC*FE2EC(I)-P(I,1)**2)))
+ P(I,2)=FAC*FE1EC(51-I)
+ V(I,2)=SQRT(MAX(0.D0,FAC*(FAC*FE2EC(51-I)-P(I,2)**2)))
+ P(I,3)=FAC*FE1EA(I)
+ V(I,3)=SQRT(MAX(0.D0,FAC*(FAC*FE2EA(I)-P(I,3)**2)))
+ P(I,4)=PARU(1)*(I-1)/50.
+ P(I,5)=PARU(1)*I/50.
+ V(I,4)=3.6*(I-1)
+ V(I,5)=3.6*I
+ 630 CONTINUE
+ N=25
+ DO 640 J=1,5
+ K(N+1,J)=0
+ P(N+1,J)=0.
+ V(N+1,J)=0.
+ 640 CONTINUE
+ K(N+1,1)=32
+ K(N+1,2)=99
+ K(N+1,5)=NEVEE
+ MSTU(3)=1
+
+C...Reset statistics on decay channels.
+ ELSEIF(MTABU.EQ.50) THEN
+ NEVDC=0
+ NKFDC=0
+ NREDC=0
+
+C...Identify and order flavour content of final state.
+ ELSEIF(MTABU.EQ.51) THEN
+ NEVDC=NEVDC+1
+ NDS=0
+ DO 670 I=1,N
+ IF(K(I,1).LE.0.OR.K(I,1).GE.6) GOTO 670
+ NDS=NDS+1
+ IF(NDS.GT.8) THEN
+ NREDC=NREDC+1
+ RETURN
+ ENDIF
+ KFM=2*IABS(K(I,2))
+ IF(K(I,2).LT.0) KFM=KFM-1
+ DO 650 IDS=NDS-1,1,-1
+ IIN=IDS+1
+ IF(KFM.LT.KFDM(IDS)) GOTO 660
+ KFDM(IDS+1)=KFDM(IDS)
+ 650 CONTINUE
+ IIN=1
+ 660 KFDM(IIN)=KFM
+ 670 CONTINUE
+
+C...Find whether old or new final state.
+ DO 690 IDC=1,NKFDC
+ IF(NDS.LT.KFDC(IDC,0)) THEN
+ IKFDC=IDC
+ GOTO 700
+ ELSEIF(NDS.EQ.KFDC(IDC,0)) THEN
+ DO 680 I=1,NDS
+ IF(KFDM(I).LT.KFDC(IDC,I)) THEN
+ IKFDC=IDC
+ GOTO 700
+ ELSEIF(KFDM(I).GT.KFDC(IDC,I)) THEN
+ GOTO 690
+ ENDIF
+ 680 CONTINUE
+ IKFDC=-IDC
+ GOTO 700
+ ENDIF
+ 690 CONTINUE
+ IKFDC=NKFDC+1
+ 700 IF(IKFDC.LT.0) THEN
+ IKFDC=-IKFDC
+ ELSEIF(NKFDC.GE.200) THEN
+ NREDC=NREDC+1
+ RETURN
+ ELSE
+ DO 720 IDC=NKFDC,IKFDC,-1
+ NPDC(IDC+1)=NPDC(IDC)
+ DO 710 I=0,8
+ KFDC(IDC+1,I)=KFDC(IDC,I)
+ 710 CONTINUE
+ 720 CONTINUE
+ NKFDC=NKFDC+1
+ KFDC(IKFDC,0)=NDS
+ DO 730 I=1,NDS
+ KFDC(IKFDC,I)=KFDM(I)
+ 730 CONTINUE
+ NPDC(IKFDC)=0
+ ENDIF
+ NPDC(IKFDC)=NPDC(IKFDC)+1
+
+C...Write statistics on decay channels.
+ ELSEIF(MTABU.EQ.52) THEN
+ FAC=1./MAX(1,NEVDC)
+ WRITE(MSTU(11),5900) NEVDC
+ DO 750 IDC=1,NKFDC
+ DO 740 I=1,KFDC(IDC,0)
+ KFM=KFDC(IDC,I)
+ KF=(KFM+1)/2
+ IF(2*KF.NE.KFM) KF=-KF
+ CALL LUNAME(KF,CHAU)
+ CHDC(I)=CHAU(1:12)
+ IF(CHAU(13:13).NE.' ') CHDC(I)(12:12)='?'
+ 740 CONTINUE
+ WRITE(MSTU(11),6000) FAC*NPDC(IDC),(CHDC(I),I=1,KFDC(IDC,0))
+ 750 CONTINUE
+ IF(NREDC.NE.0) WRITE(MSTU(11),6100) FAC*NREDC
+
+C...Copy statistics on decay channels into /LUJETS/.
+ ELSEIF(MTABU.EQ.53) THEN
+ FAC=1./MAX(1,NEVDC)
+ DO 780 IDC=1,NKFDC
+ K(IDC,1)=32
+ K(IDC,2)=99
+ K(IDC,3)=0
+ K(IDC,4)=0
+ K(IDC,5)=KFDC(IDC,0)
+ DO 760 J=1,5
+ P(IDC,J)=0.
+ V(IDC,J)=0.
+ 760 CONTINUE
+ DO 770 I=1,KFDC(IDC,0)
+ KFM=KFDC(IDC,I)
+ KF=(KFM+1)/2
+ IF(2*KF.NE.KFM) KF=-KF
+ IF(I.LE.5) P(IDC,I)=KF
+ IF(I.GE.6) V(IDC,I-5)=KF
+ 770 CONTINUE
+ V(IDC,5)=FAC*NPDC(IDC)
+ 780 CONTINUE
+ N=NKFDC
+ DO 790 J=1,5
+ K(N+1,J)=0
+ P(N+1,J)=0.
+ V(N+1,J)=0.
+ 790 CONTINUE
+ K(N+1,1)=32
+ K(N+1,2)=99
+ K(N+1,5)=NEVDC
+ V(N+1,5)=FAC*NREDC
+ MSTU(3)=1
+ ENDIF
+
+C...Format statements for output on unit MSTU(11) (default 6).
+ 5000 FORMAT(///20X,'Event statistics - initial state'/
+ &20X,'based on an analysis of ',I6,' events'//
+ &3X,'Main flavours after',8X,'Fraction',4X,'Subfractions ',
+ &'according to fragmenting system multiplicity'/
+ &4X,'hard interaction',24X,'1',7X,'2',7X,'3',7X,'4',7X,'5',
+ &6X,'6-7',5X,'8-10',3X,'11-15',3X,'16-25',4X,'>25'/)
+ 5100 FORMAT(3X,A12,1X,A12,F10.5,1X,10F8.4)
+ 5200 FORMAT(///20X,'Event statistics - final state'/
+ &20X,'based on an analysis of ',I7,' events'//
+ &5X,'Mean primary multiplicity =',F10.4/
+ &5X,'Mean final multiplicity =',F10.4/
+ &5X,'Mean charged multiplicity =',F10.4//
+ &5X,'Number of particles produced per event (directly and via ',
+ &'decays/branchings)'/
+ &5X,'KF Particle/jet MDCY',10X,'Particles',13X,'Antiparticles',
+ &8X,'Total'/35X,'prim seco prim seco'/)
+ 5300 FORMAT(1X,I6,4X,A16,I2,5(1X,F11.6))
+ 5400 FORMAT(///20X,'Factorial moments analysis of multiplicity'/
+ &20X,'based on an analysis of ',I6,' events'//
+ &3X,'delta-',A3,' delta-phi <n>/bin',10X,'<F2>',18X,'<F3>',
+ &18X,'<F4>',18X,'<F5>'/35X,4(' value error '))
+ 5500 FORMAT(10X)
+ 5600 FORMAT(2X,2F10.4,F12.4,4(F12.4,F10.4))
+ 5700 FORMAT(///20X,'Energy-Energy Correlation and Asymmetry'/
+ &20X,'based on an analysis of ',I6,' events'//
+ &2X,'theta range',8X,'EEC(theta)',8X,'EEC(180-theta)',7X,
+ &'EECA(theta)'/2X,'in degrees ',3(' value error')/)
+ 5800 FORMAT(2X,F4.1,' - ',F4.1,3(F11.4,F9.4))
+ 5900 FORMAT(///20X,'Decay channel analysis - final state'/
+ &20X,'based on an analysis of ',I6,' events'//
+ &2X,'Probability',10X,'Complete final state'/)
+ 6000 FORMAT(2X,F9.5,5X,8(A12,1X))
+ 6100 FORMAT(2X,F9.5,5X,'into other channels (more than 8 particles ',
+ &'or table overflow)')
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUEEVT
+ SUBROUTINE LUEEVT(KFL,ECM)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to handle the generation of an e+e- annihilation jet event.
+C IMPLICIT DOUBLE PRECISION(D)
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+
+C...Check input parameters.
+ IF(MSTU(12).GE.1) CALL LULIST(0)
+ IF(KFL.LT.0.OR.KFL.GT.8) THEN
+ CALL LUERRM(16,'(LUEEVT:) called with unknown flavour code')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ IF(KFL.LE.5) ECMMIN=PARJ(127)+2.02*PARF(100+MAX(1,KFL))
+ IF(KFL.GE.6) ECMMIN=PARJ(127)+2.02*PMAS(KFL,1)
+ IF(ECM.LT.ECMMIN) THEN
+ CALL LUERRM(16,'(LUEEVT:) called with too small CM energy')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+
+C...Check consistency of MSTJ options set.
+ IF(MSTJ(109).EQ.2.AND.MSTJ(110).NE.1) THEN
+ CALL LUERRM(6,
+ & '(LUEEVT:) MSTJ(109) value requires MSTJ(110) = 1')
+ MSTJ(110)=1
+ ENDIF
+ IF(MSTJ(109).EQ.2.AND.MSTJ(111).NE.0) THEN
+ CALL LUERRM(6,
+ & '(LUEEVT:) MSTJ(109) value requires MSTJ(111) = 0')
+ MSTJ(111)=0
+ ENDIF
+
+C...Initialize alpha_strong and total cross-section.
+ MSTU(111)=MSTJ(108)
+ IF(MSTJ(108).EQ.2.AND.(MSTJ(101).EQ.0.OR.MSTJ(101).EQ.1))
+ &MSTU(111)=1
+ PARU(112)=PARJ(121)
+ IF(MSTU(111).EQ.2) PARU(112)=PARJ(122)
+ IF(MSTJ(116).GT.0.AND.(MSTJ(116).GE.2.OR.ABS(ECM-PARJ(151)).GE.
+ &PARJ(139).OR.10*MSTJ(102)+KFL.NE.MSTJ(119))) CALL LUXTOT(KFL,ECM,
+ &XTOT)
+ IF(MSTJ(116).GE.3) MSTJ(116)=1
+ PARJ(171)=0.
+
+C...Add initial e+e- to event record (documentation only).
+ NTRY=0
+ 100 NTRY=NTRY+1
+ IF(NTRY.GT.100) THEN
+ CALL LUERRM(14,'(LUEEVT:) caught in an infinite loop')
+ RETURN
+ ENDIF
+ MSTU(24)=0
+ NC=0
+ IF(MSTJ(115).GE.2) THEN
+ NC=NC+2
+ CALL LU1ENT(NC-1,11,0.5*ECM,0.D0,0.D0)
+ K(NC-1,1)=21
+ CALL LU1ENT(NC,-11,0.5*ECM,PARU(1),0.D0)
+ K(NC,1)=21
+ ENDIF
+
+C...Radiative photon (in initial state).
+ MK=0
+ ECMC=ECM
+ IF(MSTJ(107).GE.1.AND.MSTJ(116).GE.1) CALL LURADK(ECM,MK,PAK,
+ &THEK,PHIK,ALPK)
+ IF(MK.EQ.1) ECMC=SQRT(ECM*(ECM-2.*PAK))
+ IF(MSTJ(115).GE.1.AND.MK.EQ.1) THEN
+ NC=NC+1
+ CALL LU1ENT(NC,22,PAK,THEK,PHIK)
+ K(NC,3)=MIN(MSTJ(115)/2,1)
+ ENDIF
+
+C...Virtual exchange boson (gamma or Z0).
+ IF(MSTJ(115).GE.3) THEN
+ NC=NC+1
+ KF=22
+ IF(MSTJ(102).EQ.2) KF=23
+ MSTU10=MSTU(10)
+ MSTU(10)=1
+ P(NC,5)=ECMC
+ CALL LU1ENT(NC,KF,ECMC,0.D0,0.D0)
+ K(NC,1)=21
+ K(NC,3)=1
+ MSTU(10)=MSTU10
+ ENDIF
+
+C...Choice of flavour and jet configuration.
+ CALL LUXKFL(KFL,ECM,ECMC,KFLC)
+ IF(KFLC.EQ.0) GOTO 100
+ CALL LUXJET(ECMC,NJET,CUT)
+ KFLN=21
+ IF(NJET.EQ.4) CALL LUX4JT(NJET,CUT,KFLC,ECMC,KFLN,X1,X2,X4,
+ &X12,X14)
+ IF(NJET.EQ.3) CALL LUX3JT(NJET,CUT,KFLC,ECMC,X1,X3)
+ IF(NJET.EQ.2) MSTJ(120)=1
+
+C...Fill jet configuration and origin.
+ IF(NJET.EQ.2.AND.MSTJ(101).NE.5) CALL LU2ENT(NC+1,KFLC,-KFLC,ECMC)
+ IF(NJET.EQ.2.AND.MSTJ(101).EQ.5) CALL LU2ENT(-(NC+1),KFLC,-KFLC,
+ &ECMC)
+ IF(NJET.EQ.3) CALL LU3ENT(NC+1,KFLC,21,-KFLC,ECMC,X1,X3)
+ IF(NJET.EQ.4.AND.KFLN.EQ.21) CALL LU4ENT(NC+1,KFLC,KFLN,KFLN,
+ &-KFLC,ECMC,X1,X2,X4,X12,X14)
+ IF(NJET.EQ.4.AND.KFLN.NE.21) CALL LU4ENT(NC+1,KFLC,-KFLN,KFLN,
+ &-KFLC,ECMC,X1,X2,X4,X12,X14)
+ IF(MSTU(24).NE.0) GOTO 100
+ DO 110 IP=NC+1,N
+ K(IP,3)=K(IP,3)+MIN(MSTJ(115)/2,1)+(MSTJ(115)/3)*(NC-1)
+ 110 CONTINUE
+
+C...Angular orientation according to matrix element.
+ IF(MSTJ(106).EQ.1) THEN
+ CALL LUXDIF(NC,NJET,KFLC,ECMC,CHI,THE,PHI)
+ CALL LUDBRB(NC+1,N,0.D0,CHI,0D0,0D0,0D0)
+ CALL LUDBRB(NC+1,N,THE,PHI,0D0,0D0,0D0)
+ ENDIF
+
+C...Rotation and boost from radiative photon.
+ IF(MK.EQ.1) THEN
+ DBEK=-PAK/(ECM-PAK)
+ NMIN=NC+1-MSTJ(115)/3
+ CALL LUDBRB(NMIN,N,0.D0,-PHIK,0D0,0D0,0D0)
+ CALL LUDBRB(NMIN,N,ALPK,0.D0,DBEK*SIN(THEK),0D0,DBEK*COS(THEK))
+ CALL LUDBRB(NMIN,N,0.D0,PHIK,0D0,0D0,0D0)
+ ENDIF
+
+C...Generate parton shower. Rearrange along strings and check.
+ IF(MSTJ(101).EQ.5) THEN
+ CALL LUSHOW(N-1,N,ECMC)
+ MSTJ14=MSTJ(14)
+ IF(MSTJ(105).EQ.-1) MSTJ(14)=-1
+ IF(MSTJ(105).GE.0) MSTU(28)=0
+ CALL LUPREP(0)
+ MSTJ(14)=MSTJ14
+ IF(MSTJ(105).GE.0.AND.MSTU(28).NE.0) GOTO 100
+ ENDIF
+
+C...Fragmentation/decay generation. Information for LUTABU.
+ IF(MSTJ(105).EQ.1) CALL LUEXEC
+ MSTU(161)=KFLC
+ MSTU(162)=-KFLC
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUXTOT
+ SUBROUTINE LUXTOT(KFL,ECM,XTOT)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to calculate total cross-section, including initial
+C...state radiation effects.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUDAT1/,/LUDAT2/
+
+C...Status, (optimized) Q^2 scale, alpha_strong.
+ PARJ(151)=ECM
+ MSTJ(119)=10*MSTJ(102)+KFL
+ IF(MSTJ(111).EQ.0) THEN
+ Q2R=ECM**2
+ ELSEIF(MSTU(111).EQ.0) THEN
+ PARJ(168)=MIN(1.D0,MAX(PARJ(128),EXP(-12.*PARU(1)/
+ & ((33.-2.*MSTU(112))*PARU(111)))))
+ Q2R=PARJ(168)*ECM**2
+ ELSE
+ PARJ(168)=MIN(1.D0,MAX(PARJ(128),PARU(112)/ECM,
+ & (2.*PARU(112)/ECM)**2))
+ Q2R=PARJ(168)*ECM**2
+ ENDIF
+ ALSPI=ULALPS(Q2R)/PARU(1)
+
+C...QCD corrections factor in R.
+ IF(MSTJ(101).EQ.0.OR.MSTJ(109).EQ.1) THEN
+ RQCD=1.
+ ELSEIF(IABS(MSTJ(101)).EQ.1.AND.MSTJ(109).EQ.0) THEN
+ RQCD=1.+ALSPI
+ ELSEIF(MSTJ(109).EQ.0) THEN
+ RQCD=1.+ALSPI+(1.986-0.115*MSTU(118))*ALSPI**2
+ IF(MSTJ(111).EQ.1) RQCD=MAX(1.D0,RQCD+(33.-2.*MSTU(112))/12.*
+ & LOG(PARJ(168))*ALSPI**2)
+ ELSEIF(IABS(MSTJ(101)).EQ.1) THEN
+ RQCD=1.+(3./4.)*ALSPI
+ ELSE
+ RQCD=1.+(3./4.)*ALSPI-(3./32.+0.519*MSTU(118))*ALSPI**2
+ ENDIF
+
+C...Calculate Z0 width if default value not acceptable.
+ IF(MSTJ(102).GE.3) THEN
+ RVA=3.*(3.+(4.*PARU(102)-1.)**2)+6.*RQCD*(2.+(1.-8.*PARU(102)/
+ & 3.)**2+(4.*PARU(102)/3.-1.)**2)
+ DO 100 KFLC=5,6
+ VQ=1.
+ IF(MOD(MSTJ(103),2).EQ.1) VQ=SQRT(MAX(0.D0,1.-(2.*ULMASS(KFLC)/
+ & ECM)**2))
+ IF(KFLC.EQ.5) VF=4.*PARU(102)/3.-1.
+ IF(KFLC.EQ.6) VF=1.-8.*PARU(102)/3.
+ RVA=RVA+3.*RQCD*(0.5*VQ*(3.-VQ**2)*VF**2+VQ**3)
+ 100 CONTINUE
+ PARJ(124)=PARU(101)*PARJ(123)*RVA/(48.*PARU(102)*(1.-PARU(102)))
+ ENDIF
+
+C...Calculate propagator and related constants for QFD case.
+ POLL=1.-PARJ(131)*PARJ(132)
+ IF(MSTJ(102).GE.2) THEN
+ SFF=1./(16.*PARU(102)*(1.-PARU(102)))
+ SFW=ECM**4/((ECM**2-PARJ(123)**2)**2+(PARJ(123)*PARJ(124))**2)
+ SFI=SFW*(1.-(PARJ(123)/ECM)**2)
+ VE=4.*PARU(102)-1.
+ SF1I=SFF*(VE*POLL+PARJ(132)-PARJ(131))
+ SF1W=SFF**2*((VE**2+1.)*POLL+2.*VE*(PARJ(132)-PARJ(131)))
+ HF1I=SFI*SF1I
+ HF1W=SFW*SF1W
+ ENDIF
+
+C...Loop over different flavours: charge, velocity.
+ RTOT=0.
+ RQQ=0.
+ RQV=0.
+ RVA=0.
+ DO 110 KFLC=1,MAX(MSTJ(104),KFL)
+ IF(KFL.GT.0.AND.KFLC.NE.KFL) GOTO 110
+ MSTJ(93)=1
+ PMQ=ULMASS(KFLC)
+ IF(ECM.LT.2.*PMQ+PARJ(127)) GOTO 110
+ QF=KCHG(KFLC,1)/3.
+ VQ=1.
+ IF(MOD(MSTJ(103),2).EQ.1) VQ=SQRT(1.-(2.*PMQ/ECM)**2)
+
+C...Calculate R and sum of charges for QED or QFD case.
+ RQQ=RQQ+3.*QF**2*POLL
+ IF(MSTJ(102).LE.1) THEN
+ RTOT=RTOT+3.*0.5*VQ*(3.-VQ**2)*QF**2*POLL
+ ELSE
+ VF=SIGN(1.D0,QF)-4.*QF*PARU(102)
+ RQV=RQV-6.*QF*VF*SF1I
+ RVA=RVA+3.*(VF**2+1.)*SF1W
+ RTOT=RTOT+3.*(0.5*VQ*(3.-VQ**2)*(QF**2*POLL-2.*QF*VF*HF1I+
+ & VF**2*HF1W)+VQ**3*HF1W)
+ ENDIF
+ 110 CONTINUE
+ RSUM=RQQ
+ IF(MSTJ(102).GE.2) RSUM=RQQ+SFI*RQV+SFW*RVA
+
+C...Calculate cross-section, including QCD corrections.
+ PARJ(141)=RQQ
+ PARJ(142)=RTOT
+ PARJ(143)=RTOT*RQCD
+ PARJ(144)=PARJ(143)
+ PARJ(145)=PARJ(141)*86.8/ECM**2
+ PARJ(146)=PARJ(142)*86.8/ECM**2
+ PARJ(147)=PARJ(143)*86.8/ECM**2
+ PARJ(148)=PARJ(147)
+ PARJ(157)=RSUM*RQCD
+ PARJ(158)=0.
+ PARJ(159)=0.
+ XTOT=PARJ(147)
+ IF(MSTJ(107).LE.0) RETURN
+
+C...Virtual cross-section.
+ XKL=PARJ(135)
+ XKU=MIN(PARJ(136),1.-(2.*PARJ(127)/ECM)**2)
+ ALE=2.*LOG(ECM/ULMASS(11))-1.
+ SIGV=ALE/3.+2.*LOG(ECM**2/(ULMASS(13)*ULMASS(15)))/3.-4./3.+
+ &1.526*LOG(ECM**2/0.932)
+
+C...Soft and hard radiative cross-section in QED case.
+ IF(MSTJ(102).LE.1) THEN
+ SIGV=1.5*ALE-0.5+PARU(1)**2/3.+2.*SIGV
+ SIGS=ALE*(2.*LOG(XKL)-LOG(1.-XKL)-XKL)
+ SIGH=ALE*(2.*LOG(XKU/XKL)-LOG((1.-XKU)/(1.-XKL))-(XKU-XKL))
+
+C...Soft and hard radiative cross-section in QFD case.
+ ELSE
+ SZM=1.-(PARJ(123)/ECM)**2
+ SZW=PARJ(123)*PARJ(124)/ECM**2
+ PARJ(161)=-RQQ/RSUM
+ PARJ(162)=-(RQQ+RQV+RVA)/RSUM
+ PARJ(163)=(RQV*(1.-0.5*SZM-SFI)+RVA*(1.5-SZM-SFW))/RSUM
+ PARJ(164)=(RQV*SZW**2*(1.-2.*SFW)+RVA*(2.*SFI+SZW**2-4.+3.*SZM-
+ & SZM**2))/(SZW*RSUM)
+ SIGV=1.5*ALE-0.5+PARU(1)**2/3.+((2.*RQQ+SFI*RQV)/RSUM)*SIGV+
+ & (SZW*SFW*RQV/RSUM)*PARU(1)*20./9.
+ SIGS=ALE*(2.*LOG(XKL)+PARJ(161)*LOG(1.-XKL)+PARJ(162)*XKL+
+ & PARJ(163)*LOG(((XKL-SZM)**2+SZW**2)/(SZM**2+SZW**2))+
+ & PARJ(164)*(ATAN((XKL-SZM)/SZW)-ATAN(-SZM/SZW)))
+ SIGH=ALE*(2.*LOG(XKU/XKL)+PARJ(161)*LOG((1.-XKU)/(1.-XKL))+
+ & PARJ(162)*(XKU-XKL)+PARJ(163)*LOG(((XKU-SZM)**2+SZW**2)/
+ & ((XKL-SZM)**2+SZW**2))+PARJ(164)*(ATAN((XKU-SZM)/SZW)-
+ & ATAN((XKL-SZM)/SZW)))
+ ENDIF
+
+C...Total cross-section and fraction of hard photon events.
+ PARJ(160)=SIGH/(PARU(1)/PARU(101)+SIGV+SIGS+SIGH)
+ PARJ(157)=RSUM*(1.+(PARU(101)/PARU(1))*(SIGV+SIGS+SIGH))*RQCD
+ PARJ(144)=PARJ(157)
+ PARJ(148)=PARJ(144)*86.8/ECM**2
+ XTOT=PARJ(148)
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LURADK
+ SUBROUTINE LURADK(ECM,MK,PAK,THEK,PHIK,ALPK)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to generate initial state photon radiation.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ SAVE /LUDAT1/
+
+C...Function: cumulative hard photon spectrum in QFD case.
+ FXK(XX)=2.*LOG(XX)+PARJ(161)*LOG(1.-XX)+PARJ(162)*XX+
+ &PARJ(163)*LOG((XX-SZM)**2+SZW**2)+PARJ(164)*ATAN((XX-SZM)/SZW)
+
+C...Determine whether radiative photon or not.
+ MK=0
+ PAK=0.
+ IF(PARJ(160).LT.RLU(0)) RETURN
+ MK=1
+
+C...Photon energy range. Find photon momentum in QED case.
+ XKL=PARJ(135)
+ XKU=MIN(PARJ(136),1.-(2.*PARJ(127)/ECM)**2)
+ IF(MSTJ(102).LE.1) THEN
+ 100 XK=1./(1.+(1./XKL-1.)*((1./XKU-1.)/(1./XKL-1.))**RLU(0))
+ IF(1.+(1.-XK)**2.LT.2.*RLU(0)) GOTO 100
+
+C...Ditto in QFD case, by numerical inversion of integrated spectrum.
+ ELSE
+ SZM=1.-(PARJ(123)/ECM)**2
+ SZW=PARJ(123)*PARJ(124)/ECM**2
+ FXKL=FXK(XKL)
+ FXKU=FXK(XKU)
+ FXKD=1D-4*(FXKU-FXKL)
+ FXKR=FXKL+RLU(0)*(FXKU-FXKL)
+ NXK=0
+ 110 NXK=NXK+1
+ XK=0.5*(XKL+XKU)
+ FXKV=FXK(XK)
+ IF(FXKV.GT.FXKR) THEN
+ XKU=XK
+ FXKU=FXKV
+ ELSE
+ XKL=XK
+ FXKL=FXKV
+ ENDIF
+ IF(NXK.LT.15.AND.FXKU-FXKL.GT.FXKD) GOTO 110
+ XK=XKL+(XKU-XKL)*(FXKR-FXKL)/(FXKU-FXKL)
+ ENDIF
+ PAK=0.5*ECM*XK
+
+C...Photon polar and azimuthal angle.
+ PME=2.*(ULMASS(11)/ECM)**2
+ 120 CTHM=PME*(2./PME)**RLU(0)
+ IF(1.-(XK**2*CTHM*(1.-0.5*CTHM)+2.*(1.-XK)*PME/MAX(PME,
+ &CTHM*(1.-0.5*CTHM)))/(1.+(1.-XK)**2).LT.RLU(0)) GOTO 120
+ CTHE=1.-CTHM
+ IF(RLU(0).GT.0.5) CTHE=-CTHE
+ STHE=SQRT(MAX(0.D0,(CTHM-PME)*(2.-CTHM)))
+ THEK=ULANGL(CTHE,STHE)
+ PHIK=PARU(2)*RLU(0)
+
+C...Rotation angle for hadronic system.
+ SGN=1.
+ IF(0.5*(2.-XK*(1.-CTHE))**2/((2.-XK)**2+(XK*CTHE)**2).GT.
+ &RLU(0)) SGN=-1.
+ ALPK=ASIN(SGN*STHE*(XK-SGN*(2.*SQRT(1.-XK)-2.+XK)*CTHE)/
+ &(2.-XK*(1.-SGN*CTHE)))
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUXKFL
+ SUBROUTINE LUXKFL(KFL,ECM,ECMC,KFLC)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to select flavour for produced qqbar pair.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUDAT1/,/LUDAT2/
+
+C...Calculate maximum weight in QED or QFD case.
+ IF(MSTJ(102).LE.1) THEN
+ RFMAX=4./9.
+ ELSE
+ POLL=1.-PARJ(131)*PARJ(132)
+ SFF=1./(16.*PARU(102)*(1.-PARU(102)))
+ SFW=ECMC**4/((ECMC**2-PARJ(123)**2)**2+(PARJ(123)*PARJ(124))**2)
+ SFI=SFW*(1.-(PARJ(123)/ECMC)**2)
+ VE=4.*PARU(102)-1.
+ HF1I=SFI*SFF*(VE*POLL+PARJ(132)-PARJ(131))
+ HF1W=SFW*SFF**2*((VE**2+1.)*POLL+2.*VE*(PARJ(132)-PARJ(131)))
+ RFMAX=MAX(4./9.*POLL-4./3.*(1.-8.*PARU(102)/3.)*HF1I+
+ & ((1.-8.*PARU(102)/3.)**2+1.)*HF1W,1./9.*POLL+2./3.*
+ & (-1.+4.*PARU(102)/3.)*HF1I+((-1.+4.*PARU(102)/3.)**2+1.)*HF1W)
+ ENDIF
+
+C...Choose flavour. Gives charge and velocity.
+ NTRY=0
+ 100 NTRY=NTRY+1
+ IF(NTRY.GT.100) THEN
+ CALL LUERRM(14,'(LUXKFL:) caught in an infinite loop')
+ KFLC=0
+ RETURN
+ ENDIF
+ KFLC=KFL
+ IF(KFL.LE.0) KFLC=1+INT(MSTJ(104)*RLU(0))
+ MSTJ(93)=1
+ PMQ=ULMASS(KFLC)
+ IF(ECM.LT.2.*PMQ+PARJ(127)) GOTO 100
+ QF=KCHG(KFLC,1)/3.
+ VQ=1.
+ IF(MOD(MSTJ(103),2).EQ.1) VQ=SQRT(MAX(0.D0,1.-(2.*PMQ/ECMC)**2))
+
+C...Calculate weight in QED or QFD case.
+ IF(MSTJ(102).LE.1) THEN
+ RF=QF**2
+ RFV=0.5*VQ*(3.-VQ**2)*QF**2
+ ELSE
+ VF=SIGN(1.D0,QF)-4.*QF*PARU(102)
+ RF=QF**2*POLL-2.*QF*VF*HF1I+(VF**2+1.)*HF1W
+ RFV=0.5*VQ*(3.-VQ**2)*(QF**2*POLL-2.*QF*VF*HF1I+VF**2*HF1W)+
+ & VQ**3*HF1W
+ IF(RFV.GT.0.) PARJ(171)=MIN(1.D0,VQ**3*HF1W/RFV)
+ ENDIF
+
+C...Weighting or new event (radiative photon). Cross-section update.
+ IF(KFL.LE.0.AND.RF.LT.RLU(0)*RFMAX) GOTO 100
+ PARJ(158)=PARJ(158)+1.
+ IF(ECMC.LT.2.*PMQ+PARJ(127).OR.RFV.LT.RLU(0)*RF) KFLC=0
+ IF(MSTJ(107).LE.0.AND.KFLC.EQ.0) GOTO 100
+ IF(KFLC.NE.0) PARJ(159)=PARJ(159)+1.
+ PARJ(144)=PARJ(157)*PARJ(159)/PARJ(158)
+ PARJ(148)=PARJ(144)*86.8/ECM**2
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUXJET
+ SUBROUTINE LUXJET(ECM,NJET,CUT)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to select number of jets in matrix element approach.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ SAVE /LUDAT1/
+ DIMENSION ZHUT(5)
+
+C...Relative three-jet rate in Zhu second order parametrization.
+ DATA ZHUT/3.0922, 6.2291, 7.4782, 7.8440, 8.2560/
+
+C...Trivial result for two-jets only, including parton shower.
+ IF(MSTJ(101).EQ.0.OR.MSTJ(101).EQ.5) THEN
+ CUT=0.
+
+C...QCD and Abelian vector gluon theory: Q^2 for jet rate and R.
+ ELSEIF(MSTJ(109).EQ.0.OR.MSTJ(109).EQ.2) THEN
+ CF=4./3.
+ IF(MSTJ(109).EQ.2) CF=1.
+ IF(MSTJ(111).EQ.0) THEN
+ Q2=ECM**2
+ Q2R=ECM**2
+ ELSEIF(MSTU(111).EQ.0) THEN
+ PARJ(169)=MIN(1.D0,PARJ(129))
+ Q2=PARJ(169)*ECM**2
+ PARJ(168)=MIN(1.D0,MAX(PARJ(128),EXP(-12.*PARU(1)/
+ & ((33.-2.*MSTU(112))*PARU(111)))))
+ Q2R=PARJ(168)*ECM**2
+ ELSE
+ PARJ(169)=MIN(1.D0,MAX(PARJ(129),(2.*PARU(112)/ECM)**2))
+ Q2=PARJ(169)*ECM**2
+ PARJ(168)=MIN(1.D0,MAX(PARJ(128),PARU(112)/ECM,
+ & (2.*PARU(112)/ECM)**2))
+ Q2R=PARJ(168)*ECM**2
+ ENDIF
+
+C...alpha_strong for R and R itself.
+ ALSPI=(3./4.)*CF*ULALPS(Q2R)/PARU(1)
+ IF(IABS(MSTJ(101)).EQ.1) THEN
+ RQCD=1.+ALSPI
+ ELSEIF(MSTJ(109).EQ.0) THEN
+ RQCD=1.+ALSPI+(1.986-0.115*MSTU(118))*ALSPI**2
+ IF(MSTJ(111).EQ.1) RQCD=MAX(1.D0,RQCD+(33.-2.*MSTU(112))/12.*
+ & LOG(PARJ(168))*ALSPI**2)
+ ELSE
+ RQCD=1.+ALSPI-(3./32.+0.519*MSTU(118))*(4.*ALSPI/3.)**2
+ ENDIF
+
+C...alpha_strong for jet rate. Initial value for y cut.
+ ALSPI=(3./4.)*CF*ULALPS(Q2)/PARU(1)
+ CUT=MAX(0.001D0,PARJ(125),(PARJ(126)/ECM)**2)
+ IF(IABS(MSTJ(101)).LE.1.OR.(MSTJ(109).EQ.0.AND.MSTJ(111).EQ.0))
+ & CUT=MAX(CUT,EXP(-SQRT(0.75/ALSPI))/2.)
+ IF(MSTJ(110).EQ.2) CUT=MAX(0.01D0,MIN(0.05D0,CUT))
+
+C...Parametrization of first order three-jet cross-section.
+ 100 IF(MSTJ(101).EQ.0.OR.CUT.GE.0.25) THEN
+ PARJ(152)=0.
+ ELSE
+ PARJ(152)=(2.*ALSPI/3.)*((3.-6.*CUT+2.*LOG(CUT))*
+ & LOG(CUT/(1.-2.*CUT))+(2.5+1.5*CUT-6.571)*(1.-3.*CUT)+
+ & 5.833*(1.-3.*CUT)**2-3.894*(1.-3.*CUT)**3+
+ & 1.342*(1.-3.*CUT)**4)/RQCD
+ IF(MSTJ(109).EQ.2.AND.(MSTJ(101).EQ.2.OR.MSTJ(101).LE.-2))
+ & PARJ(152)=0.
+ ENDIF
+
+C...Parametrization of second order three-jet cross-section.
+ IF(IABS(MSTJ(101)).LE.1.OR.MSTJ(101).EQ.3.OR.MSTJ(109).EQ.2.OR.
+ & CUT.GE.0.25) THEN
+ PARJ(153)=0.
+ ELSEIF(MSTJ(110).LE.1) THEN
+ CT=LOG(1./CUT-2.)
+ PARJ(153)=ALSPI**2*CT**2*(2.419+0.5989*CT+0.6782*CT**2-
+ & 0.2661*CT**3+0.01159*CT**4)/RQCD
+
+C...Interpolation in second/first order ratio for Zhu parametrization.
+ ELSEIF(MSTJ(110).EQ.2) THEN
+ IZA=0
+ DO 110 IY=1,5
+ IF(ABS(CUT-0.01*IY).LT.0.0001) IZA=IY
+ 110 CONTINUE
+ IF(IZA.NE.0) THEN
+ ZHURAT=ZHUT(IZA)
+ ELSE
+ IZ=100.*CUT
+ ZHURAT=ZHUT(IZ)+(100.*CUT-IZ)*(ZHUT(IZ+1)-ZHUT(IZ))
+ ENDIF
+ PARJ(153)=ALSPI*PARJ(152)*ZHURAT
+ ENDIF
+
+C...Shift in second order three-jet cross-section with optimized Q^2.
+ IF(MSTJ(111).EQ.1.AND.IABS(MSTJ(101)).GE.2.AND.MSTJ(101).NE.3.
+ & AND.CUT.LT.0.25) PARJ(153)=PARJ(153)+(33.-2.*MSTU(112))/12.*
+ & LOG(PARJ(169))*ALSPI*PARJ(152)
+
+C...Parametrization of second order four-jet cross-section.
+ IF(IABS(MSTJ(101)).LE.1.OR.CUT.GE.0.125) THEN
+ PARJ(154)=0.
+ ELSE
+ CT=LOG(1./CUT-5.)
+ IF(CUT.LE.0.018) THEN
+ XQQGG=6.349-4.330*CT+0.8304*CT**2
+ IF(MSTJ(109).EQ.2) XQQGG=(4./3.)**2*(3.035-2.091*CT+
+ & 0.4059*CT**2)
+ XQQQQ=1.25*(-0.1080+0.01486*CT+0.009364*CT**2)
+ IF(MSTJ(109).EQ.2) XQQQQ=8.*XQQQQ
+ ELSE
+ XQQGG=-0.09773+0.2959*CT-0.2764*CT**2+0.08832*CT**3
+ IF(MSTJ(109).EQ.2) XQQGG=(4./3.)**2*(-0.04079+0.1340*CT-
+ & 0.1326*CT**2+0.04365*CT**3)
+ XQQQQ=1.25*(0.003661-0.004888*CT-0.001081*CT**2+0.002093*
+ & CT**3)
+ IF(MSTJ(109).EQ.2) XQQQQ=8.*XQQQQ
+ ENDIF
+ PARJ(154)=ALSPI**2*CT**2*(XQQGG+XQQQQ)/RQCD
+ PARJ(155)=XQQQQ/(XQQGG+XQQQQ)
+ ENDIF
+
+C...If negative three-jet rate, change y' optimization parameter.
+ IF(MSTJ(111).EQ.1.AND.PARJ(152)+PARJ(153).LT.0..AND.
+ & PARJ(169).LT.0.99) THEN
+ PARJ(169)=MIN(1.D0,1.2*PARJ(169))
+ Q2=PARJ(169)*ECM**2
+ ALSPI=(3./4.)*CF*ULALPS(Q2)/PARU(1)
+ GOTO 100
+ ENDIF
+
+C...If too high cross-section, use harder cuts, or fail.
+ IF(PARJ(152)+PARJ(153)+PARJ(154).GE.1) THEN
+ IF(MSTJ(110).EQ.2.AND.CUT.GT.0.0499.AND.MSTJ(111).EQ.1.AND.
+ & PARJ(169).LT.0.99) THEN
+ PARJ(169)=MIN(1.D0,1.2*PARJ(169))
+ Q2=PARJ(169)*ECM**2
+ ALSPI=(3./4.)*CF*ULALPS(Q2)/PARU(1)
+ GOTO 100
+ ELSEIF(MSTJ(110).EQ.2.AND.CUT.GT.0.0499) THEN
+ CALL LUERRM(26,
+ & '(LUXJET:) no allowed y cut value for Zhu parametrization')
+ ENDIF
+ CUT=0.26*(4.*CUT)**(PARJ(152)+PARJ(153)+PARJ(154))**(-1./3.)
+ IF(MSTJ(110).EQ.2) CUT=MAX(0.01D0,MIN(0.05D0,CUT))
+ GOTO 100
+ ENDIF
+
+C...Scalar gluon (first order only).
+ ELSE
+ ALSPI=ULALPS(ECM**2)/PARU(1)
+ CUT=MAX(0.001D0,PARJ(125),(PARJ(126)/ECM)**2,EXP(-3./ALSPI))
+ PARJ(152)=0.
+ IF(CUT.LT.0.25) PARJ(152)=(ALSPI/3.)*((1.-2.*CUT)*
+ & LOG((1.-2.*CUT)/CUT)+0.5*(9.*CUT**2-1.))
+ PARJ(153)=0.
+ PARJ(154)=0.
+ ENDIF
+
+C...Select number of jets.
+ PARJ(150)=CUT
+ IF(MSTJ(101).EQ.0.OR.MSTJ(101).EQ.5) THEN
+ NJET=2
+ ELSEIF(MSTJ(101).LE.0) THEN
+ NJET=MIN(4,2-MSTJ(101))
+ ELSE
+ RNJ=RLU(0)
+ NJET=2
+ IF(PARJ(152)+PARJ(153)+PARJ(154).GT.RNJ) NJET=3
+ IF(PARJ(154).GT.RNJ) NJET=4
+ ENDIF
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUX3JT
+ SUBROUTINE LUX3JT(NJET,CUT,KFL,ECM,X1,X2)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to select the kinematical variables of three-jet events.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ SAVE /LUDAT1/
+ DIMENSION ZHUP(5,12)
+
+C...Coefficients of Zhu second order parametrization.
+ DATA ((ZHUP(IC1,IC2),IC2=1,12),IC1=1,5)/
+ & 18.29, 89.56, 4.541, -52.09, -109.8, 24.90,
+ & 11.63, 3.683, 17.50, 0.002440, -1.362, -0.3537,
+ & 11.42, 6.299, -22.55, -8.915, 59.25, -5.855,
+ & -32.85, -1.054, -16.90, 0.006489, -0.8156, 0.01095,
+ & 7.847, -3.964, -35.83, 1.178, 29.39, 0.2806,
+ & 47.82, -12.36, -56.72, 0.04054, -0.4365, 0.6062,
+ & 5.441, -56.89, -50.27, 15.13, 114.3, -18.19,
+ & 97.05, -1.890, -139.9, 0.08153, -0.4984, 0.9439,
+ & -17.65, 51.44, -58.32, 70.95, -255.7, -78.99,
+ & 476.9, 29.65, -239.3, 0.4745, -1.174, 6.081/
+
+C...Dilogarithm of x for x<0.5 (x>0.5 obtained by analytic trick).
+ DILOG(X)=X+X**2/4.+X**3/9.+X**4/16.+X**5/25.+X**6/36.+X**7/49.
+
+C...Event type. Mass effect factors and other common constants.
+ MSTJ(120)=2
+ MSTJ(121)=0
+ PMQ=ULMASS(KFL)
+ QME=(2.*PMQ/ECM)**2
+ IF(MSTJ(109).NE.1) THEN
+ CUTL=LOG(CUT)
+ CUTD=LOG(1./CUT-2.)
+ IF(MSTJ(109).EQ.0) THEN
+ CF=4./3.
+ CN=3.
+ TR=2.
+ WTMX=MIN(20.D0,37.-6.*CUTD)
+ IF(MSTJ(110).EQ.2) WTMX=2.*(7.5+80.*CUT)
+ ELSE
+ CF=1.
+ CN=0.
+ TR=12.
+ WTMX=0.
+ ENDIF
+
+C...Alpha_strong and effects of optimized Q^2 scale. Maximum weight.
+ ALS2PI=PARU(118)/PARU(2)
+ WTOPT=0.
+ IF(MSTJ(111).EQ.1) WTOPT=(33.-2.*MSTU(112))/6.*LOG(PARJ(169))*
+ & ALS2PI
+ WTMAX=MAX(0.D0,1.+WTOPT+ALS2PI*WTMX)
+
+C...Choose three-jet events in allowed region.
+ 100 NJET=3
+ 110 Y13L=CUTL+CUTD*RLU(0)
+ Y23L=CUTL+CUTD*RLU(0)
+ Y13=EXP(Y13L)
+ Y23=EXP(Y23L)
+ Y12=1.-Y13-Y23
+ IF(Y12.LE.CUT) GOTO 110
+ IF(Y13**2+Y23**2+2.*Y12.LE.2.*RLU(0)) GOTO 110
+
+C...Second order corrections.
+ IF(MSTJ(101).EQ.2.AND.MSTJ(110).LE.1) THEN
+ Y12L=LOG(Y12)
+ Y13M=LOG(1.-Y13)
+ Y23M=LOG(1.-Y23)
+ Y12M=LOG(1.-Y12)
+ IF(Y13.LE.0.5) Y13I=DILOG(Y13)
+ IF(Y13.GE.0.5) Y13I=1.644934-Y13L*Y13M-DILOG(1.-Y13)
+ IF(Y23.LE.0.5) Y23I=DILOG(Y23)
+ IF(Y23.GE.0.5) Y23I=1.644934-Y23L*Y23M-DILOG(1.-Y23)
+ IF(Y12.LE.0.5) Y12I=DILOG(Y12)
+ IF(Y12.GE.0.5) Y12I=1.644934-Y12L*Y12M-DILOG(1.-Y12)
+ WT1=(Y13**2+Y23**2+2.*Y12)/(Y13*Y23)
+ WT2=CF*(-2.*(CUTL-Y12L)**2-3.*CUTL-1.+3.289868+
+ & 2.*(2.*CUTL-Y12L)*CUT/Y12)+
+ & CN*((CUTL-Y12L)**2-(CUTL-Y13L)**2-(CUTL-Y23L)**2-11.*CUTL/6.+
+ & 67./18.+1.644934-(2.*CUTL-Y12L)*CUT/Y12+(2.*CUTL-Y13L)*
+ & CUT/Y13+(2.*CUTL-Y23L)*CUT/Y23)+
+ & TR*(2.*CUTL/3.-10./9.)+
+ & CF*(Y12/(Y12+Y13)+Y12/(Y12+Y23)+(Y12+Y23)/Y13+(Y12+Y13)/Y23+
+ & Y13L*(4.*Y12**2+2.*Y12*Y13+4.*Y12*Y23+Y13*Y23)/(Y12+Y23)**2+
+ & Y23L*(4.*Y12**2+2.*Y12*Y23+4.*Y12*Y13+Y13*Y23)/(Y12+Y13)**2)/
+ & WT1+
+ & CN*(Y13L*Y13/(Y12+Y23)+Y23L*Y23/(Y12+Y13))/WT1+
+ & (CN-2.*CF)*((Y12**2+(Y12+Y13)**2)*(Y12L*Y23L-Y12L*Y12M-Y23L*
+ & Y23M+1.644934-Y12I-Y23I)/(Y13*Y23)+(Y12**2+(Y12+Y23)**2)*
+ & (Y12L*Y13L-Y12L*Y12M-Y13L*Y13M+1.644934-Y12I-Y13I)/
+ & (Y13*Y23)+(Y13**2+Y23**2)/(Y13*Y23*(Y13+Y23))-
+ & 2.*Y12L*Y12**2/(Y13+Y23)**2-4.*Y12L*Y12/(Y13+Y23))/WT1-
+ & CN*(Y13L*Y23L-Y13L*Y13M-Y23L*Y23M+1.644934-Y13I-Y23I)
+ IF(1.+WTOPT+ALS2PI*WT2.LE.0.) MSTJ(121)=1
+ IF(1.+WTOPT+ALS2PI*WT2.LE.WTMAX*RLU(0)) GOTO 110
+ PARJ(156)=(WTOPT+ALS2PI*WT2)/(1.+WTOPT+ALS2PI*WT2)
+
+ ELSEIF(MSTJ(101).EQ.2.AND.MSTJ(110).EQ.2) THEN
+C...Second order corrections; Zhu parametrization of ERT.
+ ZX=(Y23-Y13)**2
+ ZY=1.-Y12
+ IZA=0
+ DO 120 IY=1,5
+ IF(ABS(CUT-0.01*IY).LT.0.0001) IZA=IY
+ 120 CONTINUE
+ IF(IZA.NE.0) THEN
+ IZ=IZA
+ WT2=ZHUP(IZ,1)+ZHUP(IZ,2)*ZX+ZHUP(IZ,3)*ZX**2+(ZHUP(IZ,4)+
+ & ZHUP(IZ,5)*ZX)*ZY+(ZHUP(IZ,6)+ZHUP(IZ,7)*ZX)*ZY**2+
+ & (ZHUP(IZ,8)+ZHUP(IZ,9)*ZX)*ZY**3+ZHUP(IZ,10)/(ZX-ZY**2)+
+ & ZHUP(IZ,11)/(1.-ZY)+ZHUP(IZ,12)/ZY
+ ELSE
+ IZ=100.*CUT
+ WTL=ZHUP(IZ,1)+ZHUP(IZ,2)*ZX+ZHUP(IZ,3)*ZX**2+(ZHUP(IZ,4)+
+ & ZHUP(IZ,5)*ZX)*ZY+(ZHUP(IZ,6)+ZHUP(IZ,7)*ZX)*ZY**2+
+ & (ZHUP(IZ,8)+ZHUP(IZ,9)*ZX)*ZY**3+ZHUP(IZ,10)/(ZX-ZY**2)+
+ & ZHUP(IZ,11)/(1.-ZY)+ZHUP(IZ,12)/ZY
+ IZ=IZ+1
+ WTU=ZHUP(IZ,1)+ZHUP(IZ,2)*ZX+ZHUP(IZ,3)*ZX**2+(ZHUP(IZ,4)+
+ & ZHUP(IZ,5)*ZX)*ZY+(ZHUP(IZ,6)+ZHUP(IZ,7)*ZX)*ZY**2+
+ & (ZHUP(IZ,8)+ZHUP(IZ,9)*ZX)*ZY**3+ZHUP(IZ,10)/(ZX-ZY**2)+
+ & ZHUP(IZ,11)/(1.-ZY)+ZHUP(IZ,12)/ZY
+ WT2=WTL+(WTU-WTL)*(100.*CUT+1.-IZ)
+ ENDIF
+ IF(1.+WTOPT+2.*ALS2PI*WT2.LE.0.) MSTJ(121)=1
+ IF(1.+WTOPT+2.*ALS2PI*WT2.LE.WTMAX*RLU(0)) GOTO 110
+ PARJ(156)=(WTOPT+2.*ALS2PI*WT2)/(1.+WTOPT+2.*ALS2PI*WT2)
+ ENDIF
+
+C...Impose mass cuts (gives two jets). For fixed jet number new try.
+ X1=1.-Y23
+ X2=1.-Y13
+ X3=1.-Y12
+ IF(4.*Y23*Y13*Y12/X3**2.LE.QME) NJET=2
+ IF(MOD(MSTJ(103),4).GE.2.AND.IABS(MSTJ(101)).LE.1.AND.QME*X3+
+ & 0.5*QME**2+(0.5*QME+0.25*QME**2)*((1.-X2)/(1.-X1)+
+ & (1.-X1)/(1.-X2)).GT.(X1**2+X2**2)*RLU(0)) NJET=2
+ IF(MSTJ(101).EQ.-1.AND.NJET.EQ.2) GOTO 100
+
+C...Scalar gluon model (first order only, no mass effects).
+ ELSE
+ 130 NJET=3
+ 140 X3=SQRT(4.*CUT**2+RLU(0)*((1.-CUT)**2-4.*CUT**2))
+ IF(LOG((X3-CUT)/CUT).LE.RLU(0)*LOG((1.-2.*CUT)/CUT)) GOTO 140
+ YD=SIGN(2.*CUT*((X3-CUT)/CUT)**RLU(0)-X3,RLU(0)-0.5)
+ X1=1.-0.5*(X3+YD)
+ X2=1.-0.5*(X3-YD)
+ IF(4.*(1.-X1)*(1.-X2)*(1.-X3)/X3**2.LE.QME) NJET=2
+ IF(MSTJ(102).GE.2) THEN
+ IF(X3**2-2.*(1.+X3)*(1.-X1)*(1.-X2)*PARJ(171).LT.
+ & X3**2*RLU(0)) NJET=2
+ ENDIF
+ IF(MSTJ(101).EQ.-1.AND.NJET.EQ.2) GOTO 130
+ ENDIF
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUX4JT
+ SUBROUTINE LUX4JT(NJET,CUT,KFL,ECM,KFLN,X1,X2,X4,X12,X14)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to select the kinematical variables of four-jet events.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ SAVE /LUDAT1/
+ DIMENSION WTA(4),WTB(4),WTC(4),WTD(4),WTE(4)
+
+C...Common constants. Colour factors for QCD and Abelian gluon theory.
+ PMQ=ULMASS(KFL)
+ QME=(2.*PMQ/ECM)**2
+ CT=LOG(1./CUT-5.)
+ IF(MSTJ(109).EQ.0) THEN
+ CF=4./3.
+ CN=3.
+ TR=2.5
+ ELSE
+ CF=1.
+ CN=0.
+ TR=15.
+ ENDIF
+
+C...Choice of process (qqbargg or qqbarqqbar).
+ 100 NJET=4
+ IT=1
+ IF(PARJ(155).GT.RLU(0)) IT=2
+ IF(MSTJ(101).LE.-3) IT=-MSTJ(101)-2
+ IF(IT.EQ.1) WTMX=0.7/CUT**2
+ IF(IT.EQ.1.AND.MSTJ(109).EQ.2) WTMX=0.6/CUT**2
+ IF(IT.EQ.2) WTMX=0.1125*CF*TR/CUT**2
+ ID=1
+
+C...Sample the five kinematical variables (for qqgg preweighted in y34).
+ 110 Y134=3.*CUT+(1.-6.*CUT)*RLU(0)
+ Y234=3.*CUT+(1.-6.*CUT)*RLU(0)
+ IF(IT.EQ.1) Y34=(1.-5.*CUT)*EXP(-CT*RLU(0))
+ IF(IT.EQ.2) Y34=CUT+(1.-6.*CUT)*RLU(0)
+ IF(Y34.LE.Y134+Y234-1..OR.Y34.GE.Y134*Y234) GOTO 110
+ VT=RLU(0)
+ CP=COS(PARU(1)*RLU(0))
+ Y14=(Y134-Y34)*VT
+ Y13=Y134-Y14-Y34
+ VB=Y34*(1.-Y134-Y234+Y34)/((Y134-Y34)*(Y234-Y34))
+ Y24=0.5*(Y234-Y34)*(1.-4.*SQRT(MAX(0.D0,VT*(1.-VT)*VB*(1.-VB)))*
+ &CP-(1.-2.*VT)*(1.-2.*VB))
+ Y23=Y234-Y34-Y24
+ Y12=1.-Y134-Y23-Y24
+ IF(MIN(Y12,Y13,Y14,Y23,Y24).LE.CUT) GOTO 110
+ Y123=Y12+Y13+Y23
+ Y124=Y12+Y14+Y24
+
+C...Calculate matrix elements for qqgg or qqqq process.
+ IC=0
+ WTTOT=0.
+ 120 IC=IC+1
+ IF(IT.EQ.1) THEN
+ WTA(IC)=(Y12*Y34**2-Y13*Y24*Y34+Y14*Y23*Y34+3.*Y12*Y23*Y34+
+ & 3.*Y12*Y14*Y34+4.*Y12**2*Y34-Y13*Y23*Y24+2.*Y12*Y23*Y24-
+ & Y13*Y14*Y24-2.*Y12*Y13*Y24+2.*Y12**2*Y24+Y14*Y23**2+2.*Y12*
+ & Y23**2+Y14**2*Y23+4.*Y12*Y14*Y23+4.*Y12**2*Y23+2.*Y12*Y14**2+
+ & 2.*Y12*Y13*Y14+4.*Y12**2*Y14+2.*Y12**2*Y13+2.*Y12**3)/(2.*Y13*
+ & Y134*Y234*Y24)+(Y24*Y34+Y12*Y34+Y13*Y24-Y14*Y23+Y12*Y13)/(Y13*
+ & Y134**2)+2.*Y23*(1.-Y13)/(Y13*Y134*Y24)+Y34/(2.*Y13*Y24)
+ WTB(IC)=(Y12*Y24*Y34+Y12*Y14*Y34-Y13*Y24**2+Y13*Y14*Y24+2.*Y12*
+ & Y14*Y24)/(Y13*Y134*Y23*Y14)+Y12*(1.+Y34)*Y124/(Y134*Y234*Y14*
+ & Y24)-(2.*Y13*Y24+Y14**2+Y13*Y23+2.*Y12*Y13)/(Y13*Y134*Y14)+
+ & Y12*Y123*Y124/(2.*Y13*Y14*Y23*Y24)
+ WTC(IC)=-(5.*Y12*Y34**2+2.*Y12*Y24*Y34+2.*Y12*Y23*Y34+2.*Y12*
+ & Y14*Y34+2.*Y12*Y13*Y34+4.*Y12**2*Y34-Y13*Y24**2+Y14*Y23*Y24+
+ & Y13*Y23*Y24+Y13*Y14*Y24-Y12*Y14*Y24-Y13**2*Y24-3.*Y12*Y13*Y24-
+ & Y14*Y23**2-Y14**2*Y23+Y13*Y14*Y23-3.*Y12*Y14*Y23-Y12*Y13*Y23)/
+ & (4.*Y134*Y234*Y34**2)+(3.*Y12*Y34**2-3.*Y13*Y24*Y34+3.*Y12*Y24*
+ & Y34+3.*Y14*Y23*Y34-Y13*Y24**2-Y12*Y23*Y34+6.*Y12*Y14*Y34+2.*Y12*
+ & Y13*Y34-2.*Y12**2*Y34+Y14*Y23*Y24-3.*Y13*Y23*Y24-2.*Y13*Y14*
+ & Y24+4.*Y12*Y14*Y24+2.*Y12*Y13*Y24+3.*Y14*Y23**2+2.*Y14**2*Y23+
+ & 2.*Y14**2*Y12+2.*Y12**2*Y14+6.*Y12*Y14*Y23-2.*Y12*Y13**2-
+ & 2.*Y12**2*Y13)/(4.*Y13*Y134*Y234*Y34)
+ WTC(IC)=WTC(IC)+(2.*Y12*Y34**2-2.*Y13*Y24*Y34+Y12*Y24*Y34+
+ & 4.*Y13*Y23*Y34+4.*Y12*Y14*Y34+2.*Y12*Y13*Y34+2.*Y12**2*Y34-
+ & Y13*Y24**2+3.*Y14*Y23*Y24+4.*Y13*Y23*Y24-2.*Y13*Y14*Y24+
+ & 4.*Y12*Y14*Y24+2.*Y12*Y13*Y24+2.*Y14*Y23**2+4.*Y13*Y23**2+
+ & 2.*Y13*Y14*Y23+2.*Y12*Y14*Y23+4.*Y12*Y13*Y23+2.*Y12*Y14**2+4.*
+ & Y12**2*Y13+4.*Y12*Y13*Y14+2.*Y12**2*Y14)/(4.*Y13*Y134*Y24*Y34)-
+ & (Y12*Y34**2-2.*Y14*Y24*Y34-2.*Y13*Y24*Y34-Y14*Y23*Y34+Y13*Y23*
+ & Y34+Y12*Y14*Y34+2.*Y12*Y13*Y34-2.*Y14**2*Y24-4.*Y13*Y14*Y24-
+ & 4.*Y13**2*Y24-Y14**2*Y23-Y13**2*Y23+Y12*Y13*Y14-Y12*Y13**2)/
+ & (2.*Y13*Y34*Y134**2)+(Y12*Y34**2-4.*Y14*Y24*Y34-2.*Y13*Y24*Y34-
+ & 2.*Y14*Y23*Y34-4.*Y13*Y23*Y34-4.*Y12*Y14*Y34-4.*Y12*Y13*Y34-
+ & 2.*Y13*Y14*Y24+2.*Y13**2*Y24+2.*Y14**2*Y23-2.*Y13*Y14*Y23-
+ & Y12*Y14**2-6.*Y12*Y13*Y14-Y12*Y13**2)/(4.*Y34**2*Y134**2)
+ WTTOT=WTTOT+Y34*CF*(CF*WTA(IC)+(CF-0.5*CN)*WTB(IC)+CN*WTC(IC))/
+ & 8.
+ ELSE
+ WTD(IC)=(Y13*Y23*Y34+Y12*Y23*Y34-Y12**2*Y34+Y13*Y23*Y24+2.*Y12*
+ & Y23*Y24-Y14*Y23**2+Y12*Y13*Y24+Y12*Y14*Y23+Y12*Y13*Y14)/(Y13**2*
+ & Y123**2)-(Y12*Y34**2-Y13*Y24*Y34+Y12*Y24*Y34-Y14*Y23*Y34-Y12*
+ & Y23*Y34-Y13*Y24**2+Y14*Y23*Y24-Y13*Y23*Y24-Y13**2*Y24+Y14*
+ & Y23**2)/(Y13**2*Y123*Y134)+(Y13*Y14*Y12+Y34*Y14*Y12-Y34**2*Y12+
+ & Y13*Y14*Y24+2.*Y34*Y14*Y24-Y23*Y14**2+Y34*Y13*Y24+Y34*Y23*Y14+
+ & Y34*Y13*Y23)/(Y13**2*Y134**2)-(Y34*Y12**2-Y13*Y24*Y12+Y34*Y24*
+ & Y12-Y23*Y14*Y12-Y34*Y14*Y12-Y13*Y24**2+Y23*Y14*Y24-Y13*Y14*Y24-
+ & Y13**2*Y24+Y23*Y14**2)/(Y13**2*Y134*Y123)
+ WTE(IC)=(Y12*Y34*(Y23-Y24+Y14+Y13)+Y13*Y24**2-Y14*Y23*Y24+Y13*
+ & Y23*Y24+Y13*Y14*Y24+Y13**2*Y24-Y14*Y23*(Y14+Y23+Y13))/(Y13*Y23*
+ & Y123*Y134)-Y12*(Y12*Y34-Y23*Y24-Y13*Y24-Y14*Y23-Y14*Y13)/(Y13*
+ & Y23*Y123**2)-(Y14+Y13)*(Y24+Y23)*Y34/(Y13*Y23*Y134*Y234)+
+ & (Y12*Y34*(Y14-Y24+Y23+Y13)+Y13*Y24**2-Y23*Y14*Y24+Y13*Y14*Y24+
+ & Y13*Y23*Y24+Y13**2*Y24-Y23*Y14*(Y14+Y23+Y13))/(Y13*Y14*Y134*
+ & Y123)-Y34*(Y34*Y12-Y14*Y24-Y13*Y24-Y23*Y14-Y23*Y13)/(Y13*Y14*
+ & Y134**2)-(Y23+Y13)*(Y24+Y14)*Y12/(Y13*Y14*Y123*Y124)
+ WTTOT=WTTOT+CF*(TR*WTD(IC)+(CF-0.5*CN)*WTE(IC))/16.
+ ENDIF
+
+C...Permutations of momenta in matrix element. Weighting.
+ 130 IF(IC.EQ.1.OR.IC.EQ.3.OR.ID.EQ.2.OR.ID.EQ.3) THEN
+ YSAV=Y13
+ Y13=Y14
+ Y14=YSAV
+ YSAV=Y23
+ Y23=Y24
+ Y24=YSAV
+ YSAV=Y123
+ Y123=Y124
+ Y124=YSAV
+ ENDIF
+ IF(IC.EQ.2.OR.IC.EQ.4.OR.ID.EQ.3.OR.ID.EQ.4) THEN
+ YSAV=Y13
+ Y13=Y23
+ Y23=YSAV
+ YSAV=Y14
+ Y14=Y24
+ Y24=YSAV
+ YSAV=Y134
+ Y134=Y234
+ Y234=YSAV
+ ENDIF
+ IF(IC.LE.3) GOTO 120
+ IF(ID.EQ.1.AND.WTTOT.LT.RLU(0)*WTMX) GOTO 110
+ IC=5
+
+C...qqgg events: string configuration and event type.
+ IF(IT.EQ.1) THEN
+ IF(MSTJ(109).EQ.0.AND.ID.EQ.1) THEN
+ PARJ(156)=Y34*(2.*(WTA(1)+WTA(2)+WTA(3)+WTA(4))+4.*(WTC(1)+
+ & WTC(2)+WTC(3)+WTC(4)))/(9.*WTTOT)
+ IF(WTA(2)+WTA(4)+2.*(WTC(2)+WTC(4)).GT.RLU(0)*(WTA(1)+WTA(2)+
+ & WTA(3)+WTA(4)+2.*(WTC(1)+WTC(2)+WTC(3)+WTC(4)))) ID=2
+ IF(ID.EQ.2) GOTO 130
+ ELSEIF(MSTJ(109).EQ.2.AND.ID.EQ.1) THEN
+ PARJ(156)=Y34*(WTA(1)+WTA(2)+WTA(3)+WTA(4))/(8.*WTTOT)
+ IF(WTA(2)+WTA(4).GT.RLU(0)*(WTA(1)+WTA(2)+WTA(3)+WTA(4))) ID=2
+ IF(ID.EQ.2) GOTO 130
+ ENDIF
+ MSTJ(120)=3
+ IF(MSTJ(109).EQ.0.AND.0.5*Y34*(WTC(1)+WTC(2)+WTC(3)+WTC(4)).GT.
+ & RLU(0)*WTTOT) MSTJ(120)=4
+ KFLN=21
+
+C...Mass cuts. Kinematical variables out.
+ IF(Y12.LE.CUT+QME) NJET=2
+ IF(NJET.EQ.2) GOTO 150
+ Q12=0.5*(1.-SQRT(1.-QME/Y12))
+ X1=1.-(1.-Q12)*Y234-Q12*Y134
+ X4=1.-(1.-Q12)*Y134-Q12*Y234
+ X2=1.-Y124
+ X12=(1.-Q12)*Y13+Q12*Y23
+ X14=Y12-0.5*QME
+ IF(Y134*Y234/((1.-X1)*(1.-X4)).LE.RLU(0)) NJET=2
+
+C...qqbarqqbar events: string configuration, choose new flavour.
+ ELSE
+ IF(ID.EQ.1) THEN
+ WTR=RLU(0)*(WTD(1)+WTD(2)+WTD(3)+WTD(4))
+ IF(WTR.LT.WTD(2)+WTD(3)+WTD(4)) ID=2
+ IF(WTR.LT.WTD(3)+WTD(4)) ID=3
+ IF(WTR.LT.WTD(4)) ID=4
+ IF(ID.GE.2) GOTO 130
+ ENDIF
+ MSTJ(120)=5
+ PARJ(156)=CF*TR*(WTD(1)+WTD(2)+WTD(3)+WTD(4))/(16.*WTTOT)
+ 140 KFLN=1+INT(5.*RLU(0))
+ IF(KFLN.NE.KFL.AND.0.2*PARJ(156).LE.RLU(0)) GOTO 140
+ IF(KFLN.EQ.KFL.AND.1.-0.8*PARJ(156).LE.RLU(0)) GOTO 140
+ IF(KFLN.GT.MSTJ(104)) NJET=2
+ PMQN=ULMASS(KFLN)
+ QMEN=(2.*PMQN/ECM)**2
+
+C...Mass cuts. Kinematical variables out.
+ IF(Y24.LE.CUT+QME.OR.Y13.LE.1.1*QMEN) NJET=2
+ IF(NJET.EQ.2) GOTO 150
+ Q24=0.5*(1.-SQRT(1.-QME/Y24))
+ Q13=0.5*(1.-SQRT(1.-QMEN/Y13))
+ X1=1.-(1.-Q24)*Y123-Q24*Y134
+ X4=1.-(1.-Q24)*Y134-Q24*Y123
+ X2=1.-(1.-Q13)*Y234-Q13*Y124
+ X12=(1.-Q24)*((1.-Q13)*Y14+Q13*Y34)+Q24*((1.-Q13)*Y12+Q13*Y23)
+ X14=Y24-0.5*QME
+ X34=(1.-Q24)*((1.-Q13)*Y23+Q13*Y12)+Q24*((1.-Q13)*Y34+Q13*Y14)
+ IF(PMQ**2+PMQN**2+MIN(X12,X34)*ECM**2.LE.
+ & (PARJ(127)+PMQ+PMQN)**2) NJET=2
+ IF(Y123*Y134/((1.-X1)*(1.-X4)).LE.RLU(0)) NJET=2
+ ENDIF
+ 150 IF(MSTJ(101).LE.-2.AND.NJET.EQ.2) GOTO 100
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUXDIF
+ SUBROUTINE LUXDIF(NC,NJET,KFL,ECM,CHI,THE,PHI)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to give the angular orientation of events.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+
+C...Charge. Factors depending on polarization for QED case.
+ QF=KCHG(KFL,1)/3.
+ POLL=1.-PARJ(131)*PARJ(132)
+ POLD=PARJ(132)-PARJ(131)
+ IF(MSTJ(102).LE.1.OR.MSTJ(109).EQ.1) THEN
+ HF1=POLL
+ HF2=0.
+ HF3=PARJ(133)**2
+ HF4=0.
+
+C...Factors depending on flavour, energy and polarization for QFD case.
+ ELSE
+ SFF=1./(16.*PARU(102)*(1.-PARU(102)))
+ SFW=ECM**4/((ECM**2-PARJ(123)**2)**2+(PARJ(123)*PARJ(124))**2)
+ SFI=SFW*(1.-(PARJ(123)/ECM)**2)
+ AE=-1.
+ VE=4.*PARU(102)-1.
+ AF=SIGN(1.D0,QF)
+ VF=AF-4.*QF*PARU(102)
+ HF1=QF**2*POLL-2.*QF*VF*SFI*SFF*(VE*POLL-AE*POLD)+
+ & (VF**2+AF**2)*SFW*SFF**2*((VE**2+AE**2)*POLL-2.*VE*AE*POLD)
+ HF2=-2.*QF*AF*SFI*SFF*(AE*POLL-VE*POLD)+2.*VF*AF*SFW*SFF**2*
+ & (2.*VE*AE*POLL-(VE**2+AE**2)*POLD)
+ HF3=PARJ(133)**2*(QF**2-2.*QF*VF*SFI*SFF*VE+(VF**2+AF**2)*
+ & SFW*SFF**2*(VE**2-AE**2))
+ HF4=-PARJ(133)**2*2.*QF*VF*SFW*(PARJ(123)*PARJ(124)/ECM**2)*
+ & SFF*AE
+ ENDIF
+
+C...Mass factor. Differential cross-sections for two-jet events.
+ SQ2=SQRT(2.)
+ QME=0.
+ IF(MSTJ(103).GE.4.AND.IABS(MSTJ(101)).LE.1.AND.MSTJ(102).LE.1.AND.
+ &MSTJ(109).NE.1) QME=(2.*ULMASS(KFL)/ECM)**2
+ IF(NJET.EQ.2) THEN
+ SIGU=4.*SQRT(1.-QME)
+ SIGL=2.*QME*SQRT(1.-QME)
+ SIGT=0.
+ SIGI=0.
+ SIGA=0.
+ SIGP=4.
+
+C...Kinematical variables. Reduce four-jet event to three-jet one.
+ ELSE
+ IF(NJET.EQ.3) THEN
+ X1=2.*P(NC+1,4)/ECM
+ X2=2.*P(NC+3,4)/ECM
+ ELSE
+ ECMR=P(NC+1,4)+P(NC+4,4)+SQRT((P(NC+2,1)+P(NC+3,1))**2+
+ & (P(NC+2,2)+P(NC+3,2))**2+(P(NC+2,3)+P(NC+3,3))**2)
+ X1=2.*P(NC+1,4)/ECMR
+ X2=2.*P(NC+4,4)/ECMR
+ ENDIF
+
+C...Differential cross-sections for three-jet (or reduced four-jet).
+ XQ=(1.-X1)/(1.-X2)
+ CT12=(X1*X2-2.*X1-2.*X2+2.+QME)/SQRT((X1**2-QME)*(X2**2-QME))
+ ST12=SQRT(1.-CT12**2)
+ IF(MSTJ(109).NE.1) THEN
+ SIGU=2.*X1**2+X2**2*(1.+CT12**2)-QME*(3.+CT12**2-X1-X2)-
+ & QME*X1/XQ+0.5*QME*((X2**2-QME)*ST12**2-2.*X2)*XQ
+ SIGL=(X2*ST12)**2-QME*(3.-CT12**2-2.5*(X1+X2)+X1*X2+QME)+
+ & 0.5*QME*(X1**2-X1-QME)/XQ+0.5*QME*((X2**2-QME)*CT12**2-X2)*XQ
+ SIGT=0.5*(X2**2-QME-0.5*QME*(X2**2-QME)/XQ)*ST12**2
+ SIGI=((1.-0.5*QME*XQ)*(X2**2-QME)*ST12*CT12+QME*(1.-X1-X2+
+ & 0.5*X1*X2+0.5*QME)*ST12/CT12)/SQ2
+ SIGA=X2**2*ST12/SQ2
+ SIGP=2.*(X1**2-X2**2*CT12)
+
+C...Differential cross-sect for scalar gluons (no mass effects).
+ ELSE
+ X3=2.-X1-X2
+ XT=X2*ST12
+ CT13=SQRT(MAX(0.D0,1.-(XT/X3)**2))
+ SIGU=(1.-PARJ(171))*(X3**2-0.5*XT**2)+
+ & PARJ(171)*(X3**2-0.5*XT**2-4.*(1.-X1)*(1.-X2)**2/X1)
+ SIGL=(1.-PARJ(171))*0.5*XT**2+
+ & PARJ(171)*0.5*(1.-X1)**2*XT**2
+ SIGT=(1.-PARJ(171))*0.25*XT**2+
+ & PARJ(171)*0.25*XT**2*(1.-2.*X1)
+ SIGI=-(0.5/SQ2)*((1.-PARJ(171))*XT*X3*CT13+
+ & PARJ(171)*XT*((1.-2.*X1)*X3*CT13-X1*(X1-X2)))
+ SIGA=(0.25/SQ2)*XT*(2.*(1.-X1)-X1*X3)
+ SIGP=X3**2-2.*(1.-X1)*(1.-X2)/X1
+ ENDIF
+ ENDIF
+
+C...Upper bounds for differential cross-section.
+ HF1A=ABS(HF1)
+ HF2A=ABS(HF2)
+ HF3A=ABS(HF3)
+ HF4A=ABS(HF4)
+ SIGMAX=(2.*HF1A+HF3A+HF4A)*ABS(SIGU)+2.*(HF1A+HF3A+HF4A)*
+ &ABS(SIGL)+2.*(HF1A+2.*HF3A+2.*HF4A)*ABS(SIGT)+2.*SQ2*
+ &(HF1A+2.*HF3A+2.*HF4A)*ABS(SIGI)+4.*SQ2*HF2A*ABS(SIGA)+
+ &2.*HF2A*ABS(SIGP)
+
+C...Generate angular orientation according to differential cross-sect.
+ 100 CHI=PARU(2)*RLU(0)
+ CTHE=2.*RLU(0)-1.
+ PHI=PARU(2)*RLU(0)
+ CCHI=COS(CHI)
+ SCHI=SIN(CHI)
+ C2CHI=COS(2.*CHI)
+ S2CHI=SIN(2.*CHI)
+ THE=ACOS(CTHE)
+ STHE=SIN(THE)
+ C2PHI=COS(2.*(PHI-PARJ(134)))
+ S2PHI=SIN(2.*(PHI-PARJ(134)))
+ SIG=((1.+CTHE**2)*HF1+STHE**2*(C2PHI*HF3-S2PHI*HF4))*SIGU+
+ &2.*(STHE**2*HF1-STHE**2*(C2PHI*HF3-S2PHI*HF4))*SIGL+
+ &2.*(STHE**2*C2CHI*HF1+((1.+CTHE**2)*C2CHI*C2PHI-2.*CTHE*S2CHI*
+ &S2PHI)*HF3-((1.+CTHE**2)*C2CHI*S2PHI+2.*CTHE*S2CHI*C2PHI)*HF4)*
+ &SIGT-2.*SQ2*(2.*STHE*CTHE*CCHI*HF1-2.*STHE*(CTHE*CCHI*C2PHI-
+ &SCHI*S2PHI)*HF3+2.*STHE*(CTHE*CCHI*S2PHI+SCHI*C2PHI)*HF4)*SIGI+
+ &4.*SQ2*STHE*CCHI*HF2*SIGA+2.*CTHE*HF2*SIGP
+ IF(SIG.LT.SIGMAX*RLU(0)) GOTO 100
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUONIA
+ SUBROUTINE LUONIA(KFL,ECM)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to generate Upsilon and toponium decays into three
+C...gluons or two gluons and a photon.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+
+C...Printout. Check input parameters.
+ IF(MSTU(12).GE.1) CALL LULIST(0)
+ IF(KFL.LT.0.OR.KFL.GT.8) THEN
+ CALL LUERRM(16,'(LUONIA:) called with unknown flavour code')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+ IF(ECM.LT.PARJ(127)+2.02*PARF(101)) THEN
+ CALL LUERRM(16,'(LUONIA:) called with too small CM energy')
+ IF(MSTU(21).GE.1) RETURN
+ ENDIF
+
+C...Initial e+e- and onium state (optional).
+ NC=0
+ IF(MSTJ(115).GE.2) THEN
+ NC=NC+2
+ CALL LU1ENT(NC-1,11,0.5*ECM,0.D0,0.D0)
+ K(NC-1,1)=21
+ CALL LU1ENT(NC,-11,0.5*ECM,PARU(1),0.D0)
+ K(NC,1)=21
+ ENDIF
+ KFLC=IABS(KFL)
+ IF(MSTJ(115).GE.3.AND.KFLC.GE.5) THEN
+ NC=NC+1
+ KF=110*KFLC+3
+ MSTU10=MSTU(10)
+ MSTU(10)=1
+ P(NC,5)=ECM
+ CALL LU1ENT(NC,KF,ECM,0.D0,0.D0)
+ K(NC,1)=21
+ K(NC,3)=1
+ MSTU(10)=MSTU10
+ ENDIF
+
+C...Choose x1 and x2 according to matrix element.
+ NTRY=0
+ 100 X1=RLU(0)
+ X2=RLU(0)
+ X3=2.-X1-X2
+ IF(X3.GE.1..OR.((1.-X1)/(X2*X3))**2+((1.-X2)/(X1*X3))**2+
+ &((1.-X3)/(X1*X2))**2.LE.2.*RLU(0)) GOTO 100
+ NTRY=NTRY+1
+ NJET=3
+ IF(MSTJ(101).LE.4) CALL LU3ENT(NC+1,21,21,21,ECM,X1,X3)
+ IF(MSTJ(101).GE.5) CALL LU3ENT(-(NC+1),21,21,21,ECM,X1,X3)
+
+C...Photon-gluon-gluon events. Small system modifications. Jet origin.
+ MSTU(111)=MSTJ(108)
+ IF(MSTJ(108).EQ.2.AND.(MSTJ(101).EQ.0.OR.MSTJ(101).EQ.1))
+ &MSTU(111)=1
+ PARU(112)=PARJ(121)
+ IF(MSTU(111).EQ.2) PARU(112)=PARJ(122)
+ QF=0.
+ IF(KFLC.NE.0) QF=KCHG(KFLC,1)/3.
+ RGAM=7.2*QF**2*PARU(101)/ULALPS(ECM**2)
+ MK=0
+ ECMC=ECM
+ IF(RLU(0).GT.RGAM/(1.+RGAM)) THEN
+ IF(1.-MAX(X1,X2,X3).LE.MAX((PARJ(126)/ECM)**2,PARJ(125)))
+ & NJET=2
+ IF(NJET.EQ.2.AND.MSTJ(101).LE.4) CALL LU2ENT(NC+1,21,21,ECM)
+ IF(NJET.EQ.2.AND.MSTJ(101).GE.5) CALL LU2ENT(-(NC+1),21,21,ECM)
+ ELSE
+ MK=1
+ ECMC=SQRT(1.-X1)*ECM
+ IF(ECMC.LT.2.*PARJ(127)) GOTO 100
+ K(NC+1,1)=1
+ K(NC+1,2)=22
+ K(NC+1,4)=0
+ K(NC+1,5)=0
+ IF(MSTJ(101).GE.5) K(NC+2,4)=MSTU(5)*(NC+3)
+ IF(MSTJ(101).GE.5) K(NC+2,5)=MSTU(5)*(NC+3)
+ IF(MSTJ(101).GE.5) K(NC+3,4)=MSTU(5)*(NC+2)
+ IF(MSTJ(101).GE.5) K(NC+3,5)=MSTU(5)*(NC+2)
+ NJET=2
+ IF(ECMC.LT.4.*PARJ(127)) THEN
+ MSTU10=MSTU(10)
+ MSTU(10)=1
+ P(NC+2,5)=ECMC
+ CALL LU1ENT(NC+2,83,0.5*(X2+X3)*ECM,PARU(1),0.D0)
+ MSTU(10)=MSTU10
+ NJET=0
+ ENDIF
+ ENDIF
+ DO 110 IP=NC+1,N
+ K(IP,3)=K(IP,3)+(MSTJ(115)/2)+(KFLC/5)*(MSTJ(115)/3)*(NC-1)
+ 110 CONTINUE
+
+C...Differential cross-sections. Upper limit for cross-section.
+ IF(MSTJ(106).EQ.1) THEN
+ SQ2=SQRT(2.)
+ HF1=1.-PARJ(131)*PARJ(132)
+ HF3=PARJ(133)**2
+ CT13=(X1*X3-2.*X1-2.*X3+2.)/(X1*X3)
+ ST13=SQRT(1.-CT13**2)
+ SIGL=0.5*X3**2*((1.-X2)**2+(1.-X3)**2)*ST13**2
+ SIGU=(X1*(1.-X1))**2+(X2*(1.-X2))**2+(X3*(1.-X3))**2-SIGL
+ SIGT=0.5*SIGL
+ SIGI=(SIGL*CT13/ST13+0.5*X1*X3*(1.-X2)**2*ST13)/SQ2
+ SIGMAX=(2.*HF1+HF3)*ABS(SIGU)+2.*(HF1+HF3)*ABS(SIGL)+2.*(HF1+
+ & 2.*HF3)*ABS(SIGT)+2.*SQ2*(HF1+2.*HF3)*ABS(SIGI)
+
+C...Angular orientation of event.
+ 120 CHI=PARU(2)*RLU(0)
+ CTHE=2.*RLU(0)-1.
+ PHI=PARU(2)*RLU(0)
+ CCHI=COS(CHI)
+ SCHI=SIN(CHI)
+ C2CHI=COS(2.*CHI)
+ S2CHI=SIN(2.*CHI)
+ THE=ACOS(CTHE)
+ STHE=SIN(THE)
+ C2PHI=COS(2.*(PHI-PARJ(134)))
+ S2PHI=SIN(2.*(PHI-PARJ(134)))
+ SIG=((1.+CTHE**2)*HF1+STHE**2*C2PHI*HF3)*SIGU+2.*(STHE**2*HF1-
+ & STHE**2*C2PHI*HF3)*SIGL+2.*(STHE**2*C2CHI*HF1+((1.+CTHE**2)*
+ & C2CHI*C2PHI-2.*CTHE*S2CHI*S2PHI)*HF3)*SIGT-2.*SQ2*(2.*STHE*CTHE*
+ & CCHI*HF1-2.*STHE*(CTHE*CCHI*C2PHI-SCHI*S2PHI)*HF3)*SIGI
+ IF(SIG.LT.SIGMAX*RLU(0)) GOTO 120
+ CALL LUDBRB(NC+1,N,0.D0,CHI,0D0,0D0,0D0)
+ CALL LUDBRB(NC+1,N,THE,PHI,0D0,0D0,0D0)
+ ENDIF
+
+C...Generate parton shower. Rearrange along strings and check.
+ IF(MSTJ(101).GE.5.AND.NJET.GE.2) THEN
+ CALL LUSHOW(NC+MK+1,-NJET,ECMC)
+ MSTJ14=MSTJ(14)
+ IF(MSTJ(105).EQ.-1) MSTJ(14)=-1
+ IF(MSTJ(105).GE.0) MSTU(28)=0
+ CALL LUPREP(0)
+ MSTJ(14)=MSTJ14
+ IF(MSTJ(105).GE.0.AND.MSTU(28).NE.0) GOTO 100
+ ENDIF
+
+C...Generate fragmentation. Information for LUTABU:
+ IF(MSTJ(105).EQ.1) CALL LUEXEC
+ MSTU(161)=110*KFLC+3
+ MSTU(162)=0
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUHEPC
+ SUBROUTINE LUHEPC(MCONV)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to convert JETSET event record contents to or from
+C...the standard event record commonblock.
+C...Note that HEPEVT is in double precision according to LEP 2 standard.
+ PARAMETER (NMXHEP=2000)
+ COMMON/HEPEVT/NEVHEP,NHEP,ISTHEP(NMXHEP),IDHEP(NMXHEP),
+ &JMOHEP(2,NMXHEP),JDAHEP(2,NMXHEP),PHEP(5,NMXHEP),VHEP(4,NMXHEP)
+C DOUBLE PRECISION PHEP,VHEP
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ SAVE /HEPEVT/
+ SAVE /LUJETS/,/LUDAT1/,/LUDAT2/
+
+C...Conversion from JETSET to standard, the easy part.
+ IF(MCONV.EQ.1) THEN
+ NEVHEP=0
+ IF(N.GT.NMXHEP) CALL LUERRM(8,
+ & '(LUHEPC:) no more space in /HEPEVT/')
+ NHEP=MIN(N,NMXHEP)
+ DO 140 I=1,NHEP
+ ISTHEP(I)=0
+ IF(K(I,1).GE.1.AND.K(I,1).LE.10) ISTHEP(I)=1
+ IF(K(I,1).GE.11.AND.K(I,1).LE.20) ISTHEP(I)=2
+ IF(K(I,1).GE.21.AND.K(I,1).LE.30) ISTHEP(I)=3
+ IF(K(I,1).GE.31.AND.K(I,1).LE.100) ISTHEP(I)=K(I,1)
+ IDHEP(I)=K(I,2)
+ JMOHEP(1,I)=K(I,3)
+ JMOHEP(2,I)=0
+ IF(K(I,1).NE.3.AND.K(I,1).NE.13.AND.K(I,1).NE.14) THEN
+ JDAHEP(1,I)=K(I,4)
+ JDAHEP(2,I)=K(I,5)
+ ELSE
+ JDAHEP(1,I)=0
+ JDAHEP(2,I)=0
+ ENDIF
+ DO 100 J=1,5
+ PHEP(J,I)=P(I,J)
+ 100 CONTINUE
+ DO 110 J=1,4
+ VHEP(J,I)=V(I,J)
+ 110 CONTINUE
+
+C...Check if new event (from pileup).
+ IF(I.EQ.1) THEN
+ INEW=1
+ ELSE
+ IF(K(I,1).EQ.21.AND.K(I-1,1).NE.21) INEW=I
+ ENDIF
+
+C...Fill in missing mother information.
+ IF(I.GE.INEW+2.AND.K(I,1).EQ.21.AND.K(I,3).EQ.0) THEN
+ IMO1=I-2
+ IF(I.GE.INEW+3.AND.K(I-1,1).EQ.21.AND.K(I-1,3).EQ.0)
+ & IMO1=IMO1-1
+ JMOHEP(1,I)=IMO1
+ JMOHEP(2,I)=IMO1+1
+ ELSEIF(K(I,2).GE.91.AND.K(I,2).LE.93) THEN
+ I1=K(I,3)-1
+ 120 I1=I1+1
+ IF(I1.GE.I) CALL LUERRM(8,
+ & '(LUHEPC:) translation of inconsistent event history')
+ IF(I1.LT.I.AND.K(I1,1).NE.1.AND.K(I1,1).NE.11) GOTO 120
+ KC=LUCOMP(K(I1,2))
+ IF(I1.LT.I.AND.KC.EQ.0) GOTO 120
+ IF(I1.LT.I.AND.KCHG(KC,2).EQ.0) GOTO 120
+ JMOHEP(2,I)=I1
+ ELSEIF(K(I,2).EQ.94) THEN
+ NJET=2
+ IF(NHEP.GE.I+3.AND.K(I+3,3).LE.I) NJET=3
+ IF(NHEP.GE.I+4.AND.K(I+4,3).LE.I) NJET=4
+ JMOHEP(2,I)=MOD(K(I+NJET,4)/MSTU(5),MSTU(5))
+ IF(JMOHEP(2,I).EQ.JMOHEP(1,I)) JMOHEP(2,I)=
+ & MOD(K(I+1,4)/MSTU(5),MSTU(5))
+ ENDIF
+
+C...Fill in missing daughter information.
+ IF(K(I,2).EQ.94.AND.MSTU(16).NE.2) THEN
+ DO 130 I1=JDAHEP(1,I),JDAHEP(2,I)
+ I2=MOD(K(I1,4)/MSTU(5),MSTU(5))
+ JDAHEP(1,I2)=I
+ 130 CONTINUE
+ ENDIF
+ IF(K(I,2).GE.91.AND.K(I,2).LE.94) GOTO 140
+ I1=JMOHEP(1,I)
+ IF(I1.LE.0.OR.I1.GT.NHEP) GOTO 140
+ IF(K(I1,1).NE.13.AND.K(I1,1).NE.14) GOTO 140
+ IF(JDAHEP(1,I1).EQ.0) THEN
+ JDAHEP(1,I1)=I
+ ELSE
+ JDAHEP(2,I1)=I
+ ENDIF
+ 140 CONTINUE
+ DO 150 I=1,NHEP
+ IF(K(I,1).NE.13.AND.K(I,1).NE.14) GOTO 150
+ IF(JDAHEP(2,I).EQ.0) JDAHEP(2,I)=JDAHEP(1,I)
+ 150 CONTINUE
+
+C...Conversion from standard to JETSET, the easy part.
+ ELSE
+ IF(NHEP.GT.MSTU(4)) CALL LUERRM(8,
+ & '(LUHEPC:) no more space in /LUJETS/')
+ N=MIN(NHEP,MSTU(4))
+ NKQ=0
+ KQSUM=0
+ DO 180 I=1,N
+ K(I,1)=0
+ IF(ISTHEP(I).EQ.1) K(I,1)=1
+ IF(ISTHEP(I).EQ.2) K(I,1)=11
+ IF(ISTHEP(I).EQ.3) K(I,1)=21
+ K(I,2)=IDHEP(I)
+ K(I,3)=JMOHEP(1,I)
+ K(I,4)=JDAHEP(1,I)
+ K(I,5)=JDAHEP(2,I)
+ DO 160 J=1,5
+ P(I,J)=PHEP(J,I)
+ 160 CONTINUE
+ DO 170 J=1,4
+ V(I,J)=VHEP(J,I)
+ 170 CONTINUE
+ V(I,5)=0.
+ IF(ISTHEP(I).EQ.2.AND.PHEP(4,I).GT.PHEP(5,I)) THEN
+ I1=JDAHEP(1,I)
+ IF(I1.GT.0.AND.I1.LE.NHEP) V(I,5)=(VHEP(4,I1)-VHEP(4,I))*
+ & PHEP(5,I)/PHEP(4,I)
+ ENDIF
+
+C...Fill in missing information on colour connection in jet systems.
+ IF(ISTHEP(I).EQ.1) THEN
+ KC=LUCOMP(K(I,2))
+ KQ=0
+ IF(KC.NE.0) KQ=KCHG(KC,2)*ISIGN(1,K(I,2))
+ IF(KQ.NE.0) NKQ=NKQ+1
+ IF(KQ.NE.2) KQSUM=KQSUM+KQ
+ IF(KQ.NE.0.AND.KQSUM.NE.0) THEN
+ K(I,1)=2
+ ELSEIF(KQ.EQ.2.AND.I.LT.N) THEN
+ IF(K(I+1,2).EQ.21) K(I,1)=2
+ ENDIF
+ ENDIF
+ 180 CONTINUE
+ IF(NKQ.EQ.1.OR.KQSUM.NE.0) CALL LUERRM(8,
+ & '(LUHEPC:) input parton configuration not colour singlet')
+ ENDIF
+
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUTEST
+ SUBROUTINE LUTEST(MTEST)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to provide a simple program (disguised as subroutine) to
+C...run at installation as a check that the program works as intended.
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ SAVE /LUJETS/,/LUDAT1/
+ DIMENSION PSUM(5),PINI(6),PFIN(6)
+
+C...Loop over events to be generated.
+ IF(MTEST.GE.1) CALL LUTABU(20)
+ NERR=0
+ DO 180 IEV=1,600
+
+C...Reset parameter values. Switch on some nonstandard features.
+ MSTJ(1)=1
+ MSTJ(3)=0
+ MSTJ(11)=1
+ MSTJ(42)=2
+ MSTJ(43)=4
+ MSTJ(44)=2
+ PARJ(17)=0.1
+ PARJ(22)=1.5
+ PARJ(43)=1.
+ PARJ(54)=-0.05
+ MSTJ(101)=5
+ MSTJ(104)=5
+ MSTJ(105)=0
+ MSTJ(107)=1
+ IF(IEV.EQ.301.OR.IEV.EQ.351.OR.IEV.EQ.401) MSTJ(116)=3
+
+C...Ten events each for some single jets configurations.
+ IF(IEV.LE.50) THEN
+ ITY=(IEV+9)/10
+ MSTJ(3)=-1
+ IF(ITY.EQ.3.OR.ITY.EQ.4) MSTJ(11)=2
+ IF(ITY.EQ.1) CALL LU1ENT(1,1,15.D0,0.D0,0.D0)
+ IF(ITY.EQ.2) CALL LU1ENT(1,3101,15.D0,0.D0,0.D0)
+ IF(ITY.EQ.3) CALL LU1ENT(1,-2203,15.D0,0.D0,0.D0)
+ IF(ITY.EQ.4) CALL LU1ENT(1,-4,30.D0,0.D0,0.D0)
+ IF(ITY.EQ.5) CALL LU1ENT(1,21,15.D0,0.D0,0.D0)
+
+C...Ten events each for some simple jet systems; string fragmentation.
+ ELSEIF(IEV.LE.130) THEN
+ ITY=(IEV-41)/10
+ IF(ITY.EQ.1) CALL LU2ENT(1,1,-1,40.D0)
+ IF(ITY.EQ.2) CALL LU2ENT(1,4,-4,30.D0)
+ IF(ITY.EQ.3) CALL LU2ENT(1,2,2103,100.D0)
+ IF(ITY.EQ.4) CALL LU2ENT(1,21,21,40.D0)
+ IF(ITY.EQ.5) CALL LU3ENT(1,2101,21,-3203,30.D0,0.6D0,0.8D0)
+ IF(ITY.EQ.6) CALL LU3ENT(1,5,21,-5,40.D0,0.9D0,0.8D0)
+ IF(ITY.EQ.7) CALL LU3ENT(1,21,21,21,60.D0,0.7D0,0.5D0)
+ IF(ITY.EQ.8)
+ & CALL LU4ENT(1,2,21,21,-2,40.D0,0.4D0,0.64D0,0.6D0,0.12D0,0.2D0)
+
+C...Seventy events with independent fragmentation and momentum cons.
+ ELSEIF(IEV.LE.200) THEN
+ ITY=1+(IEV-131)/16
+ MSTJ(2)=1+MOD(IEV-131,4)
+ MSTJ(3)=1+MOD((IEV-131)/4,4)
+ IF(ITY.EQ.1) CALL LU2ENT(1,4,-5,40.D0)
+ IF(ITY.EQ.2) CALL LU3ENT(1,3,21,-3,40.D0,0.9D0,0.4D0)
+ IF(ITY.EQ.3)
+ & CALL LU4ENT(1,2,21,21,-2,40.D0,0.4D0,0.64D0,0.6D0,0.12D0,0.2D0)
+ IF(ITY.GE.4)
+ & CALL LU4ENT(1,2,-3,3,-2,40.D0,0.4D0,0.64D0,0.6D0,0.12D0,0.2D0)
+
+C...A hundred events with random jets (check invariant mass).
+ ELSEIF(IEV.LE.300) THEN
+ 100 DO 110 J=1,5
+ PSUM(J)=0.
+ 110 CONTINUE
+ NJET=2.+6.*RLU(0)
+ DO 130 I=1,NJET
+ KFL=21
+ IF(I.EQ.1) KFL=INT(1.+4.*RLU(0))
+ IF(I.EQ.NJET) KFL=-INT(1.+4.*RLU(0))
+ EJET=5.+20.*RLU(0)
+ THETA=ACOS(2.*RLU(0)-1.)
+ PHI=6.2832*RLU(0)
+ IF(I.LT.NJET) CALL LU1ENT(-I,KFL,EJET,THETA,PHI)
+ IF(I.EQ.NJET) CALL LU1ENT(I,KFL,EJET,THETA,PHI)
+ IF(I.EQ.1.OR.I.EQ.NJET) MSTJ(93)=1
+ IF(I.EQ.1.OR.I.EQ.NJET) PSUM(5)=PSUM(5)+ULMASS(KFL)
+ DO 120 J=1,4
+ PSUM(J)=PSUM(J)+P(I,J)
+ 120 CONTINUE
+ 130 CONTINUE
+ IF(PSUM(4)**2-PSUM(1)**2-PSUM(2)**2-PSUM(3)**2.LT.
+ & (PSUM(5)+PARJ(32))**2) GOTO 100
+
+C...Fifty e+e- continuum events with matrix elements.
+ ELSEIF(IEV.LE.350) THEN
+ MSTJ(101)=2
+ CALL LUEEVT(0,40.D0)
+
+C...Fifty e+e- continuum event with varying shower options.
+ ELSEIF(IEV.LE.400) THEN
+ MSTJ(42)=1+MOD(IEV,2)
+ MSTJ(43)=1+MOD(IEV/2,4)
+ MSTJ(44)=MOD(IEV/8,3)
+ CALL LUEEVT(0,90.D0)
+
+C...Fifty e+e- continuum events with coherent shower, including top.
+ ELSEIF(IEV.LE.450) THEN
+ MSTJ(104)=6
+ CALL LUEEVT(0,500.D0)
+
+C...Fifty Upsilon decays to ggg or gammagg with coherent shower.
+ ELSEIF(IEV.LE.500) THEN
+ CALL LUONIA(5,9.46D0)
+
+C...One decay each for some heavy mesons.
+ ELSEIF(IEV.LE.560) THEN
+ ITY=IEV-501
+ KFLS=2*(ITY/20)+1
+ KFLB=8-MOD(ITY/5,4)
+ KFLC=KFLB-MOD(ITY,5)
+ CALL LU1ENT(1,100*KFLB+10*KFLC+KFLS,0.D0,0.D0,0.D0)
+
+C...One decay each for some heavy baryons.
+ ELSEIF(IEV.LE.600) THEN
+ ITY=IEV-561
+ KFLS=2*(ITY/20)+2
+ KFLA=8-MOD(ITY/5,4)
+ KFLB=KFLA-MOD(ITY,5)
+ KFLC=MAX(1,KFLB-1)
+ CALL LU1ENT(1,1000*KFLA+100*KFLB+10*KFLC+KFLS,0.D0,0.D0,0.D0)
+ ENDIF
+
+C...Generate event. Find total momentum, energy and charge.
+ DO 140 J=1,4
+ PINI(J)=PLU(0,J)
+ 140 CONTINUE
+ PINI(6)=PLU(0,6)
+ CALL LUEXEC
+ DO 150 J=1,4
+ PFIN(J)=PLU(0,J)
+ 150 CONTINUE
+ PFIN(6)=PLU(0,6)
+
+C...Check conservation of energy, momentum and charge;
+C...usually exact, but only approximate for single jets.
+ MERR=0
+ IF(IEV.LE.50) THEN
+ IF((PFIN(1)-PINI(1))**2+(PFIN(2)-PINI(2))**2.GE.4.) MERR=MERR+1
+ EPZREM=PINI(4)+PINI(3)-PFIN(4)-PFIN(3)
+ IF(EPZREM.LT.0..OR.EPZREM.GT.2.*PARJ(31)) MERR=MERR+1
+ IF(ABS(PFIN(6)-PINI(6)).GT.2.1) MERR=MERR+1
+ ELSE
+ DO 160 J=1,4
+ IF(ABS(PFIN(J)-PINI(J)).GT.0.0001*PINI(4)) MERR=MERR+1
+ 160 CONTINUE
+ IF(ABS(PFIN(6)-PINI(6)).GT.0.1) MERR=MERR+1
+ ENDIF
+ IF(MERR.NE.0) WRITE(MSTU(11),5000) (PINI(J),J=1,4),PINI(6),
+ &(PFIN(J),J=1,4),PFIN(6)
+
+C...Check that all KF codes are known ones, and that partons/particles
+C...satisfy energy-momentum-mass relation. Store particle statistics.
+ DO 170 I=1,N
+ IF(K(I,1).GT.20) GOTO 170
+ IF(LUCOMP(K(I,2)).EQ.0) THEN
+ WRITE(MSTU(11),5100) I
+ MERR=MERR+1
+ ENDIF
+ PD=P(I,4)**2-P(I,1)**2-P(I,2)**2-P(I,3)**2-P(I,5)**2
+ IF(ABS(PD).GT.MAX(0.1D0,0.001*P(I,4)**2).OR.P(I,4).LT.0.) THEN
+ WRITE(MSTU(11),5200) I
+ MERR=MERR+1
+ ENDIF
+ 170 CONTINUE
+ IF(MTEST.GE.1) CALL LUTABU(21)
+
+C...List all erroneous events and some normal ones.
+ IF(MERR.NE.0.OR.MSTU(24).NE.0.OR.MSTU(28).NE.0) THEN
+ CALL LULIST(2)
+ ELSEIF(MTEST.GE.1.AND.MOD(IEV-5,100).EQ.0) THEN
+ CALL LULIST(1)
+ ENDIF
+
+C...Stop execution if too many errors.
+ IF(MERR.NE.0) NERR=NERR+1
+ IF(NERR.GE.10) THEN
+ WRITE(MSTU(11),5300) IEV
+ STOP
+ ENDIF
+ 180 CONTINUE
+
+C...Summarize result of run.
+ IF(MTEST.GE.1) CALL LUTABU(22)
+ IF(NERR.EQ.0) WRITE(MSTU(11),5400)
+ IF(NERR.GT.0) WRITE(MSTU(11),5500) NERR
+
+C...Reset commonblock variables changed during run.
+ MSTJ(2)=3
+ PARJ(17)=0.
+ PARJ(22)=1.
+ PARJ(43)=0.5
+ PARJ(54)=0.
+ MSTJ(105)=1
+ MSTJ(107)=0
+
+C...Format statements for output.
+ 5000 FORMAT(/' Momentum, energy and/or charge were not conserved ',
+ &'in following event'/' sum of',9X,'px',11X,'py',11X,'pz',11X,
+ &'E',8X,'charge'/' before',2X,4(1X,F12.5),1X,F8.2/' after',3X,
+ &4(1X,F12.5),1X,F8.2)
+ 5100 FORMAT(/5X,'Entry no.',I4,' in following event not known code')
+ 5200 FORMAT(/5X,'Entry no.',I4,' in following event has faulty ',
+ &'kinematics')
+ 5300 FORMAT(/5X,'Ten errors experienced by event ',I3/
+ &5X,'Something is seriously wrong! Execution stopped now!')
+ 5400 FORMAT(//5X,'End result of LUTEST: no errors detected.')
+ 5500 FORMAT(//5X,'End result of LUTEST:',I2,' errors detected.'/
+ &5X,'This should not have happened!')
+
+ RETURN
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUDATA
+ BLOCK DATA LUDATA
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Purpose: to give default values to parameters and particle and
+C...decay data.
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ COMMON/LUDAT2/KCHG(500,3),PMAS(500,4),PARF(2000),VCKM(4,4)
+ COMMON/LUDAT3/MDCY(500,3),MDME(2000,2),BRAT(2000),KFDP(2000,5)
+ COMMON/LUDAT4/CHAF(500)
+ CHARACTER CHAF*8
+ COMMON/LUDATR/MRLU(6),RRLU(100)
+ SAVE /LUDAT1/,/LUDAT2/,/LUDAT3/,/LUDAT4/,/LUDATR/
+
+C...LUDAT1, containing status codes and most parameters.
+ DATA MSTU/
+ & 0, 0, 0, 4000,10000, 500, 2000, 0, 0, 2,
+ 1 6, 1, 1, 0, 1, 1, 0, 0, 0, 0,
+ 2 2, 10, 0, 0, 1, 10, 0, 0, 0, 0,
+ 3 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 4 2, 2, 1, 4, 2, 1, 1, 0, 0, 0,
+ 5 25, 24, 0, 1, 0, 0, 0, 0, 0, 0,
+ 6 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 7 30*0,
+ & 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 1 1, 5, 3, 5, 0, 0, 0, 0, 0, 0,
+ 2 60*0,
+ 8 7, 408, 1995, 08, 23, 700, 0, 0, 0, 0,
+ 9 0, 0, 0, 0, 0, 0, 0, 0, 0, 0/
+ DATA PARU/
+ & 3.1415927, 6.2831854, 0.1973, 5.068, 0.3894, 2.568, 4*0.,
+ 1 0.001, 0.09, 0.01, 0., 0., 0., 0., 0., 0., 0.,
+ 2 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
+ 3 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
+ 4 2.0, 1.0, 0.25, 2.5, 0.05, 0., 0., 0.0001, 0., 0.,
+ 5 2.5, 1.5, 7.0, 1.0, 0.5, 2.0, 3.2, 0., 0., 0.,
+ 6 40*0.,
+ & 0.00729735, 0.232, 0.007764, 1.0, 1.16639D-5, 0., 0., 0.,
+ & 0., 0.,
+ 1 0.20, 0.25, 1.0, 4.0, 10., 0., 0., 0., 0., 0.,
+ 2 -0.693, -1.0, 0.387, 1.0, -0.08, -1.0, 1.0, 1.0, 1.0, 0.,
+ 3 1.0, -1.0, 1.0, -1.0, 1.0, 0., 0., 0., 0., 0.,
+ 4 5.0, 1.0, 1.0, 0., 1.0, 1.0, 0., 0., 0., 0.,
+ 5 1.0, 0., 0., 0., 1000., 1.0, 1.0, 1.0, 1.0, 0.,
+ 6 1.0, 1.0, 1.0, 1.0, 1.0, 0., 0., 0., 0., 0.,
+ 7 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0., 0., 0.,
+ 8 1.0, 1.0, 1.0, 0.0, 0.0, 1.0, 1.0, 0.0, 0.0, 0.,
+ 9 0., 0., 0., 0., 1.0, 0., 0., 0., 0., 0./
+ DATA MSTJ/
+ & 1, 3, 0, 0, 0, 0, 0, 0, 0, 0,
+ 1 4, 2, 0, 1, 0, 0, 0, 0, 0, 0,
+ 2 2, 1, 1, 2, 1, 2, 2, 0, 0, 0,
+ 3 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 4 2, 2, 4, 2, 5, 3, 3, 0, 0, 0,
+ 5 0, 3, 0, 0, 0, 0, 0, 0, 0, 0,
+ 6 40*0,
+ & 5, 2, 7, 5, 1, 1, 0, 2, 0, 2,
+ 1 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
+ 2 80*0/
+ DATA PARJ/
+ & 0.10, 0.30, 0.40, 0.05, 0.50, 0.50, 0.50, 0., 0., 0.,
+ 1 0.50, 0.60, 0.75, 0., 0., 0., 0., 1.0, 1.0, 0.,
+ 2 0.36, 1.0, 0.01, 2.0, 1.0, 0.4, 0., 0., 0., 0.,
+ 3 0.10, 1.0, 0.8, 1.5, 0., 2.0, 0.2, 2.5, 0.6, 0.,
+ 4 0.3, 0.58, 0.5, 0.9, 0.5, 1.0, 1.0, 1.0, 0., 0.,
+ 5 0.77,0.77,0.77,-0.05,-0.005,-0.00001,-0.00001,-0.00001,1.0,0.,
+ 6 4.5, 0.7, 0., 0.003, 0.5, 0.5, 0., 0., 0., 0.,
+ 7 10., 1000., 100., 1000., 0., 0.7, 10., 0., 0., 0.,
+ 8 0.29, 1.0, 1.0, 0., 10., 10., 0., 0., 0., 0.,
+ 9 0.02, 1.0, 0.2, 0., 0., 0., 0., 0., 0., 0.,
+ & 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
+ 1 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
+ 2 1.0, 0.25,91.187,2.489, 0.01, 2.0, 1.0, 0.25,0.002, 0.,
+ 3 0., 0., 0., 0., 0.01, 0.99, 0., 0., 0.2, 0.,
+ 4 60*0./
+
+C...LUDAT2, with particle data and flavour treatment parameters.
+ DATA (KCHG(I,1),I= 1, 500)/-1,2,-1,2,-1,2,-1,2,2*0,-3,0,-3,0,
+ &-3,0,-3,6*0,3,9*0,3,2*0,3,0,-1,44*0,2,-1,2,-1,2,3,11*0,3,0,2*3,0,
+ &3,0,3,0,3,10*0,3,0,2*3,0,3,0,3,0,3,10*0,3,0,2*3,0,3,0,3,0,3,10*0,
+ &3,0,2*3,0,3,0,3,0,3,10*0,3,0,2*3,0,3,0,3,0,3,10*0,3,0,2*3,0,3,0,
+ &3,0,3,70*0,3,0,3,28*0,3,2*0,3,8*0,-3,8*0,3,0,-3,0,3,-3,3*0,3,6,0,
+ &3,5*0,-3,0,3,-3,0,-3,4*0,-3,0,3,6,-3,0,3,-3,0,-3,0,3,6,0,3,5*0,
+ &-3,0,3,-3,0,-3,114*0/
+ DATA (KCHG(I,2),I= 1, 500)/8*1,12*0,2,16*0,2,1,50*0,-1,410*0/
+ DATA (KCHG(I,3),I= 1, 500)/8*1,2*0,8*1,5*0,1,9*0,1,2*0,1,0,2*1,
+ &41*0,1,0,7*1,10*0,10*1,10*0,10*1,10*0,10*1,10*0,10*1,10*0,10*1,
+ &10*0,10*1,70*0,3*1,22*0,1,5*0,1,0,2*1,6*0,1,0,2*1,6*0,2*1,0,5*1,
+ &0,6*1,4*0,6*1,4*0,16*1,4*0,6*1,114*0/
+ DATA (PMAS(I,1),I= 1, 500)/0.0099,0.0056,0.199,1.35,5.,160.,
+ &2*250.,2*0.,0.00051,0.,0.1057,0.,1.777,0.,250.,5*0.,91.187,80.25,
+ &80.,6*0.,500.,900.,500.,3*300.,350.,200.,5000.,60*0.,0.1396,
+ &0.4977,0.4936,1.8693,1.8645,1.9688,5.2787,5.2786,5.47972,6.594,
+ &0.135,0.5475,0.9578,2.9788,9.4,320.,2*500.,2*0.,0.7669,0.8961,
+ &0.8916,2.0101,2.0071,2.11,2*5.325,5.5068,6.602,0.7683,0.782,
+ &1.0194,3.0969,9.4603,320.,2*500.,2*0.,1.232,2*1.29,2*2.424,2.536,
+ &2*5.73,5.97,7.3,1.232,1.17,1.4,3.46,9.875,320.,2*500.,2*0.,0.983,
+ &2*1.429,2*2.272,2.5,2*5.68,5.92,7.25,0.9827,1.,1.4,3.4151,9.8598,
+ &320.,2*500.,2*0.,1.26,2*1.402,2*2.372,2.56,2*5.78,6.02,7.3,1.26,
+ &1.282,1.42,3.5106,9.8919,320.,2*500.,2*0.,1.318,1.432,1.425,
+ &2*2.46,2.61,2*5.83,6.07,7.35,1.318,1.275,1.525,3.5562,9.9132,
+ &320.,2*500.,2*0.,2*0.4977,8*0.,3.686,3*0.,10.0233,70*0.,1.1156,
+ &5*0.,2.2849,0.,2.473,2.466,6*0.,5.641,0.,2*5.84,6*0.,0.9396,
+ &0.9383,0.,1.1974,1.1926,1.1894,1.3213,1.3149,0.,2.4525,2.4529,
+ &2.4527,2*2.55,2.73,4*0.,3*5.8,2*5.96,6.12,4*0.,1.234,1.233,1.232,
+ &1.231,1.3872,1.3837,1.3828,1.535,1.5318,1.6724,3*2.5,2*2.63,2.8,
+ &4*0.,3*5.81,2*5.97,6.13,114*0./
+ DATA (PMAS(I,2),I= 1, 500)/22*0.,2.489,2.066,88*0.,0.0002,
+ &0.001,6*0.,0.149,0.0505,0.0498,7*0.,0.151,0.00843,0.0044,7*0.,
+ &0.155,2*0.09,2*0.02,0.,4*0.05,0.155,0.36,0.08,2*0.01,5*0.,0.057,
+ &2*0.287,7*0.05,0.057,0.,0.25,0.014,6*0.,0.4,2*0.174,7*0.05,0.4,
+ &0.024,0.06,0.0009,6*0.,0.11,0.109,0.098,2*0.019,5*0.02,0.11,
+ &0.185,0.076,0.002,146*0.,4*0.12,0.0394,0.036,0.0358,0.0099,
+ &0.0091,131*0./
+ DATA (PMAS(I,3),I= 1, 500)/22*0.,2*20.,88*0.,0.002,0.005,6*0.,
+ &0.4,2*0.2,7*0.,0.4,0.1,0.015,7*0.,0.25,0.005,0.01,2*0.08,0.,
+ &4*0.1,0.25,0.2,0.001,2*0.02,5*0.,0.05,2*0.4,6*0.1,2*0.05,0.,0.35,
+ &0.05,6*0.,3*0.3,2*0.1,0.03,4*0.1,0.3,0.05,0.02,0.001,6*0.,0.25,
+ &4*0.12,5*0.05,0.25,0.17,0.2,0.01,146*0.,4*0.14,0.04,2*0.035,
+ &2*0.05,131*0./
+ DATA (PMAS(I,4),I= 1, 500)/12*0.,658650.,0.,0.0914,68*0.,0.1,
+ &0.387,15*0.,7804.,0.,3709.,0.32,0.1259,0.135,3*0.387,0.15,110*0.,
+ &15500.,26.75,83*0.,78.88,5*0.,0.057,0.,0.025,0.09,6*0.,0.387,0.,
+ &2*0.387,9*0.,44.3,0.,23.95,49.1,86.9,6*0.,0.13,9*0.,0.387,13*0.,
+ &24.60001,130*0./
+ DATA PARF/
+ & 0.5, 0.25, 0.5, 0.25, 1., 0.5, 0., 0., 0., 0.,
+ 1 0.5, 0., 0.5, 0., 1., 1., 0., 0., 0., 0.,
+ 2 0.5, 0., 0.5, 0., 1., 1., 0., 0., 0., 0.,
+ 3 0.5, 0., 0.5, 0., 1., 1., 0., 0., 0., 0.,
+ 4 0.5, 0., 0.5, 0., 1., 1., 0., 0., 0., 0.,
+ 5 0.5, 0., 0.5, 0., 1., 1., 0., 0., 0., 0.,
+ 6 0.75, 0.5, 0., 0.1667, 0.0833, 0.1667, 0., 0., 0., 0.,
+ 7 0., 0., 1., 0.3333, 0.6667, 0.3333, 0., 0., 0., 0.,
+ 8 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
+ 9 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
+ & 0.325, 0.325, 0.5, 1.6, 5.0, 0., 0., 0., 0., 0.,
+ 1 0., 0.11, 0.16, 0.048, 0.50, 0.45, 0.55, 0.60, 0., 0.,
+ 2 0.2, 0.1, 0., 0., 0., 0., 0., 0., 0., 0.,
+ 3 1870*0./
+ DATA ((VCKM(I,J),J=1,4),I=1,4)/
+ 1 0.95113, 0.04884, 0.00003, 0.00000,
+ 2 0.04884, 0.94940, 0.00176, 0.00000,
+ 3 0.00003, 0.00176, 0.99821, 0.00000,
+ 4 0.00000, 0.00000, 0.00000, 1.00000/
+
+C...LUDAT3, with particle decay parameters and data.
+ DATA (MDCY(I,1),I= 1, 500)/5*0,3*1,6*0,1,0,1,5*0,3*1,6*0,1,0,1,
+ &2*0,4*1,42*0,7*1,12*0,1,0,15*1,2*0,18*1,2*0,18*1,2*0,18*1,2*0,
+ &18*1,2*0,18*1,3*0,1,8*0,1,3*0,1,70*0,1,5*0,1,0,2*1,6*0,1,0,2*1,
+ &9*0,5*1,0,6*1,4*0,6*1,4*0,16*1,4*0,6*1,114*0/
+ DATA (MDCY(I,2),I= 1, 500)/1,9,17,25,33,41,50,60,2*0,70,74,76,
+ &81,83,124,126,132,2*0,135,144,156,172,192,6*0,209,0,231,254,274,
+ &292,301,304,305,42*0,314,315,319,328,331,336,338,11*0,358,359,
+ &361,367,430,491,524,560,596,635,666,668,675,681,682,683,684,685,
+ &2*0,686,688,691,694,697,699,700,701,702,703,704,708,713,721,724,
+ &733,734,735,2*0,736,737,742,747,749,751,753,755,757,759,761,762,
+ &765,769,770,771,772,773,2*0,774,775,777,779,781,783,785,787,789,
+ &791,793,794,799,804,806,808,809,810,2*0,811,813,815,817,819,821,
+ &823,825,827,829,831,833,846,850,852,854,855,856,2*0,857,863,873,
+ &884,892,900,904,912,920,924,928,936,945,951,953,955,956,957,2*0,
+ &958,966,8*0,968,3*0,979,70*0,993,5*0,997,0,1073,1074,6*0,1075,0,
+ &1092,1093,9*0,1094,1096,1097,1100,1101,0,1103,1104,1105,1106,
+ &1107,1108,4*0,1109,1110,1111,1112,1113,1114,4*0,1115,1116,1119,
+ &1122,1123,1126,1129,1132,1134,1136,1140,1141,1142,1143,1145,1147,
+ &4*0,1148,1149,1150,1151,1152,1153,114*0/
+ DATA (MDCY(I,3),I= 1, 500)/5*8,9,2*10,2*0,4,2,5,2,41,2,6,3,2*0,
+ &9,12,16,20,17,6*0,22,0,23,20,18,9,3,1,9,42*0,1,4,9,3,5,2,20,11*0,
+ &1,2,6,63,61,33,2*36,39,31,2,7,6,5*1,2*0,2,3*3,2,5*1,4,5,8,3,9,
+ &3*1,2*0,1,2*5,7*2,1,3,4,5*1,2*0,1,9*2,1,2*5,2*2,3*1,2*0,11*2,13,
+ &4,2*2,3*1,2*0,6,10,11,2*8,4,2*8,2*4,8,9,6,2*2,3*1,2*0,8,2,8*0,11,
+ &3*0,14,70*0,4,5*0,76,0,2*1,6*0,17,0,2*1,9*0,2,1,3,1,2,0,6*1,4*0,
+ &6*1,4*0,1,2*3,1,3*3,2*2,4,3*1,2*2,1,4*0,6*1,114*0/
+ DATA (MDME(I,1),I= 1,2000)/6*1,-1,7*1,-1,7*1,-1,7*1,-1,7*1,-1,
+ &7*1,-1,1,-1,8*1,2*-1,8*1,2*-1,61*1,-1,2*1,-1,6*1,2*-1,7*1,2*-1,
+ &3*1,-1,6*1,2*-1,6*1,2*-1,3*1,-1,3*1,-1,3*1,5*-1,3*1,-1,6*1,2*-1,
+ &3*1,-1,11*1,2*-1,6*1,8*-1,3*1,-1,3*1,-1,3*1,5*-1,3*1,4*-1,6*1,
+ &2*-1,3*1,-1,5*1,-1,8*1,2*-1,3*1,-1,9*1,-1,3*1,-1,9*1,2*-1,2*1,-1,
+ &16*1,-1,2*1,3*-1,1665*1/
+ DATA (MDME(I,2),I= 1,2000)/75*102,42,6*102,2*42,2*0,7*41,2*0,
+ &24*41,6*102,45,29*102,8*32,8*0,16*32,4*0,8*32,4*0,32,4*0,8*32,
+ &14*0,16*32,7*0,8*32,4*0,32,7*0,8*32,4*0,32,5*0,4*32,5*0,3*32,0,
+ &6*32,3*0,12,2*42,2*11,9*42,2*45,31,2*45,2*33,31,2*45,20*46,7*0,
+ &24*42,41*0,16*42,46*0,10*42,20*0,2*13,14*42,16*0,48,3*13,16*42,
+ &16*0,48,3*13,16*42,19*0,48,3*13,2*42,0,2*11,28*42,0,2,4*0,2,8*0,
+ &12,32,86,87,88,3,0,2*3,0,2*3,0,2*3,0,3,6*0,3,3*0,1,0,3,2*0,2*3,
+ &3*0,1,4*0,12,3*0,4*32,2*4,86,87,88,33*0,12,32,86,87,88,31*0,12,0,
+ &32,86,87,88,40*0,12,0,32,86,87,88,95*0,12,0,32,86,87,88,2*0,4*42,
+ &6*0,12,11*0,4*32,2*4,9*0,14*42,52*0,10*13,2*84,3*42,8*0,48,3*13,
+ &2*42,2*85,14*0,84,5*0,85,886*0/
+ DATA (BRAT(I) ,I= 1, 439)/75*0.,1.,6*0.,0.179,0.178,0.116,
+ &0.235,0.005,0.056,0.018,0.023,0.011,2*0.004,0.0067,0.014,2*0.002,
+ &2*0.001,0.0022,0.054,0.002,0.016,0.005,0.011,0.0101,5*0.006,
+ &0.002,2*0.001,5*0.002,6*0.,1.,29*0.,0.15394,0.11936,0.15394,
+ &0.11926,0.15254,3*0.,0.03368,0.06664,0.03368,0.06664,0.03368,
+ &0.06664,2*0.,0.3214,0.0165,2*0.,0.0165,0.3207,2*0.,0.00001,
+ &0.00059,6*0.,3*0.1081,3*0.,0.0003,0.048,0.8705,4*0.,0.0002,
+ &0.0603,0.,0.0199,0.0008,3*0.,0.143,0.111,0.143,0.111,0.143,0.085,
+ &2*0.,0.03,0.058,0.03,0.058,0.03,0.058,8*0.,0.25,0.01,2*0.,0.01,
+ &0.25,4*0.,0.24,5*0.,3*0.08,6*0.,0.01,0.08,0.82,5*0.,0.09,11*0.,
+ &0.01,0.08,0.82,5*0.,0.09,9*0.,1.,6*0.,0.01,0.98,0.01,1.,4*0.215,
+ &2*0.,2*0.07,0.,1.,2*0.08,0.76,0.08,2*0.105,0.04,0.5,0.08,0.14,
+ &0.01,0.015,0.005,1.,3*0.,1.,4*0.,1.,0.25,0.01,2*0.,0.01,0.25,
+ &4*0.,0.24,5*0.,3*0.08,0.,1.,2*0.5,0.635,0.212,0.056,0.017,0.048,
+ &0.032,0.07,0.065,2*0.005,2*0.011,5*0.001,0.07,0.065,2*0.005,
+ &2*0.011,5*0.001,0.026,0.019,0.066,0.041,0.045,0.076,0.0073,
+ &2*0.0047,0.026,0.001,0.0006,0.0066,0.005,2*0.003,2*0.0006,
+ &2*0.001,0.006,0.005,0.012,0.0057,0.067,0.008,0.0022,0.027,0.004,
+ &0.019,0.012,0.002,0.009,0.0218,0.001,0.022,0.087,0.001,0.0019,
+ &0.0015,0.0028,0.034,0.027,2*0.002,2*0.004,2*0.002,0.034,0.027/
+ DATA (BRAT(I) ,I= 440, 655)/2*0.002,2*0.004,2*0.002,0.0365,
+ &0.045,0.073,0.062,3*0.021,0.0061,0.015,0.025,0.0088,0.074,0.0109,
+ &0.0041,0.002,0.0035,0.0011,0.001,0.0027,2*0.0016,0.0018,0.011,
+ &0.0063,0.0052,0.018,0.016,0.0034,0.0036,0.0009,0.0006,0.015,
+ &0.0923,0.018,0.022,0.0077,0.009,0.0075,0.024,0.0085,0.067,0.0511,
+ &0.017,0.0004,0.0028,0.01,2*0.02,0.03,2*0.005,2*0.02,0.03,2*0.005,
+ &0.015,0.037,0.028,0.079,0.095,0.052,0.0078,4*0.001,0.028,0.033,
+ &0.026,0.05,0.01,4*0.005,0.25,0.0952,0.02,0.055,2*0.005,0.008,
+ &0.012,0.02,0.055,2*0.005,0.008,0.012,0.01,0.03,0.0035,0.011,
+ &0.0055,0.0042,0.009,0.018,0.015,0.0185,0.0135,0.025,0.0004,
+ &0.0007,0.0008,0.0014,0.0019,0.0025,0.4291,0.08,0.07,0.02,0.015,
+ &0.005,0.02,0.055,2*0.005,0.008,0.012,0.02,0.055,2*0.005,0.008,
+ &0.012,0.01,0.03,0.0035,0.011,0.0055,0.0042,0.009,0.018,0.015,
+ &0.0185,0.0135,0.025,0.0004,0.0007,0.0008,0.0014,0.0019,0.0025,
+ &0.4291,0.08,0.07,0.02,0.015,0.005,0.02,0.055,2*0.005,0.008,0.012,
+ &0.02,0.055,2*0.005,0.008,0.012,0.01,0.03,0.0035,0.011,0.0055,
+ &0.0042,0.009,0.018,0.015,0.0185,0.0135,0.025,2*0.0002,0.0007,
+ &2*0.0004,0.0014,0.001,0.0009,0.0025,0.4291,0.08,0.07,0.02,0.015,
+ &0.005,0.047,0.122,0.006,0.012,0.035,0.012,0.035,0.003,0.007,0.15,
+ &0.037,0.008,0.002,0.05,0.015,0.003,0.001,0.014,0.042,0.014,0.042/
+ DATA (BRAT(I) ,I= 656, 931)/0.24,0.065,0.012,0.003,0.001,0.002,
+ &0.001,0.002,0.014,0.003,0.988,0.012,0.389,0.319,0.2367,0.049,
+ &0.005,0.001,0.0003,0.441,0.206,0.3,0.03,0.022,0.001,5*1.,0.99955,
+ &0.00045,0.665,0.333,0.002,0.666,0.333,0.001,0.65,0.3,0.05,0.56,
+ &0.44,5*1.,0.99912,0.00079,0.00005,0.00004,0.888,0.085,0.021,
+ &2*0.003,0.49,0.344,3*0.043,0.023,0.013,0.001,0.0627,0.0597,
+ &0.8776,3*0.027,0.015,0.045,0.015,0.045,0.77,0.029,4*1.,0.28,0.14,
+ &0.313,0.157,0.11,0.28,0.14,0.313,0.157,0.11,0.667,0.333,0.667,
+ &0.333,2*0.5,0.667,0.333,0.667,0.333,4*0.5,1.,0.333,0.334,0.333,
+ &4*0.25,6*1.,0.667,0.333,0.667,0.333,0.667,0.333,0.667,0.333,
+ &2*0.5,0.667,0.333,0.667,0.333,4*0.5,1.,0.52,0.26,0.11,2*0.055,
+ &0.62,0.31,0.035,2*0.0175,0.007,0.993,0.02,0.98,3*1.,2*0.5,0.667,
+ &0.333,0.667,0.333,0.667,0.333,0.667,0.333,2*0.5,0.667,0.333,
+ &0.667,0.333,6*0.5,3*0.12,0.097,0.043,4*0.095,4*0.03,4*0.25,0.273,
+ &0.727,0.35,0.65,3*1.,2*0.35,0.144,0.105,0.048,0.003,0.333,0.166,
+ &0.168,0.084,0.087,0.043,0.059,2*0.029,0.002,0.332,0.166,0.168,
+ &0.084,0.086,0.043,0.059,2*0.029,2*0.002,0.3,0.15,0.16,0.08,0.13,
+ &0.06,0.08,0.04,0.3,0.15,0.16,0.08,0.13,0.06,0.08,0.04,2*0.3,
+ &2*0.2,0.3,0.15,0.16,0.08,0.13,0.06,0.08,0.04,0.3,0.15,0.16,0.08,
+ &0.13,0.06,0.08,0.04,2*0.3,2*0.2,2*0.3,2*0.2,2*0.35,0.144,0.105/
+ DATA (BRAT(I) ,I= 932,2000)/0.024,2*0.012,0.003,0.566,0.283,
+ &0.069,0.028,0.023,2*0.0115,0.005,0.003,0.356,2*0.178,0.28,
+ &2*0.004,0.135,0.865,0.22,0.78,3*1.,0.217,0.124,2*0.193,2*0.135,
+ &0.002,0.001,0.686,0.314,2*0.0083,0.1866,0.324,0.184,0.027,0.001,
+ &0.093,0.087,0.078,0.0028,3*0.014,0.008,0.024,0.008,0.024,0.425,
+ &0.02,0.185,0.088,0.043,0.067,0.066,0.641,0.357,2*0.001,0.018,
+ &2*0.005,0.003,0.002,2*0.006,0.018,2*0.005,0.003,0.002,2*0.006,
+ &0.0066,0.025,0.016,0.0088,2*0.005,0.0058,0.005,0.0055,4*0.004,
+ &2*0.002,2*0.004,0.003,0.002,2*0.003,3*0.002,2*0.001,0.002,
+ &2*0.001,2*0.002,0.0013,0.0018,5*0.001,4*0.003,2*0.005,2*0.002,
+ &2*0.001,2*0.002,2*0.001,0.2432,0.057,2*0.035,0.15,2*0.075,0.03,
+ &2*0.015,2*1.,2*0.105,0.04,0.0077,0.02,0.0235,0.0285,0.0435,
+ &0.0011,0.0022,0.0044,0.4291,0.08,0.07,0.02,0.015,0.005,2*1.,
+ &0.999,0.001,1.,0.516,0.483,0.001,1.,0.995,0.005,13*1.,0.331,
+ &0.663,0.006,0.663,0.331,0.006,1.,0.88,2*0.06,0.88,2*0.06,0.88,
+ &2*0.06,0.667,2*0.333,0.667,0.676,0.234,0.085,0.005,3*1.,4*0.5,
+ &7*1.,847*0./
+ DATA (KFDP(I,1),I= 1, 507)/21,22,23,4*-24,25,21,22,23,4*24,25,
+ &21,22,23,4*-24,25,21,22,23,4*24,25,21,22,23,4*-24,25,21,22,23,
+ &4*24,25,37,21,22,23,4*-24,25,2*-37,21,22,23,4*24,25,2*37,22,23,
+ &-24,25,23,24,-12,22,23,-24,25,23,24,-12,-14,35*16,22,23,-24,25,
+ &23,24,-89,22,23,-24,25,-37,23,24,37,1,2,3,4,5,6,7,8,21,1,2,3,4,5,
+ &6,7,8,11,13,15,17,1,2,3,4,5,6,7,8,11,12,13,14,15,16,17,18,4*-1,
+ &4*-3,4*-5,4*-7,-11,-13,-15,-17,1,2,3,4,5,6,7,8,11,13,15,17,21,
+ &2*22,23,24,1,2,3,4,5,6,7,8,11,12,13,14,15,16,17,18,24,37,2*23,25,
+ &35,4*-1,4*-3,4*-5,4*-7,-11,-13,-15,-17,3*24,1,2,3,4,5,6,7,8,11,
+ &13,15,17,21,2*22,23,24,23,25,36,1,2,3,4,5,6,7,8,11,13,15,17,21,
+ &2*22,23,24,23,-1,-3,-5,-7,-11,-13,-15,-17,24,5,6,21,2,1,2,3,4,5,
+ &6,11,13,15,82,-11,-13,2*2,-12,-14,-16,2*-2,2*-4,-2,-4,2*89,37,
+ &2*-89,2*5,-37,2*89,4*-1,4*-3,4*-5,4*-7,-11,-13,-15,-17,-13,130,
+ &310,-13,3*211,12,14,11*-11,11*-13,-311,-313,-311,-313,-20313,
+ &2*-311,-313,-311,-313,2*111,2*221,2*331,2*113,2*223,2*333,-311,
+ &-313,2*-321,211,-311,-321,333,-311,-313,-321,211,2*-321,2*-311,
+ &-321,211,113,8*-11,8*-13,-321,-323,-321,-323,-311,2*-313,-311,
+ &-313,2*-311,-321,-10323,-321,-323,-321,-311,2*-313,211,111,333,
+ &3*-321,-311,-313,-321,-313,310,333,211,2*-321,-311,-313,-311,211,
+ &-321,3*-311,211,113,321,-15,5*-11,5*-13,221,331,333,221,331,333/
+ DATA (KFDP(I,1),I= 508, 924)/10221,211,213,211,213,321,323,321,
+ &323,2212,221,331,333,221,2*2,6*12,6*14,2*16,3*-411,3*-413,2*-411,
+ &2*-413,2*441,2*443,2*20443,2*2,2*4,2,4,6*12,6*14,2*16,3*-421,
+ &3*-423,2*-421,2*-423,2*441,2*443,2*20443,2*2,2*4,2,4,6*12,6*14,
+ &2*16,3*-431,3*-433,2*-431,2*-433,3*441,3*443,3*20443,2*2,2*4,2,4,
+ &16,2*4,2*12,2*14,2*16,4*2,4*4,2*-11,2*-13,2*-1,2*-3,2*-11,2*-13,
+ &2*-1,3*22,111,211,2*22,211,22,211,111,3*22,111,82,21,3*0,2*211,
+ &321,3*311,2*321,421,2*411,2*421,431,511,521,531,541,211,111,13,
+ &11,211,22,211,2*111,321,130,-213,113,213,211,22,111,11,13,82,11,
+ &13,15,1,2,3,4,21,22,3*0,223,321,311,323,313,2*311,321,313,323,
+ &321,423,2*413,2*423,413,523,2*513,2*523,2*513,523,223,213,113,
+ &-213,313,-313,323,-323,82,21,3*0,221,321,2*311,321,421,2*411,421,
+ &411,421,521,2*511,2*521,2*511,521,221,211,111,321,130,310,211,
+ &111,321,130,310,443,82,553,21,3*0,113,213,323,2*313,323,423,
+ &2*413,2*423,413,523,2*513,2*523,2*513,523,213,-213,10211,10111,
+ &-10211,2*221,213,2*113,-213,2*321,2*311,313,-313,323,-323,443,82,
+ &553,21,3*0,213,113,221,223,321,211,321,311,323,313,323,313,321,
+ &4*311,321,313,323,313,323,311,4*321,421,411,423,413,423,413,421,
+ &2*411,421,413,423,413,423,411,2*421,411,423,413,521,511,523,513,
+ &523,513,521,2*511,521,513,523,513,523,511,2*521,511,523,513,511/
+ DATA (KFDP(I,1),I= 925,2000)/521,513,523,213,-213,221,223,321,
+ &130,310,111,211,111,2*211,321,130,310,221,111,321,130,310,221,
+ &211,111,443,82,553,21,3*0,111,211,-12,12,-14,14,211,111,211,111,
+ &11,13,82,4*443,10441,20443,445,441,11,13,15,1,2,3,4,21,22,2*553,
+ &10551,20553,555,2212,2*2112,-12,7*-11,7*-13,2*2224,2*2212,2*2214,
+ &2*3122,2*3212,2*3214,5*3222,4*3224,2*3322,3324,2*2224,7*2212,
+ &5*2214,2*2112,2*2114,2*3122,2*3212,2*3214,2*3222,2*3224,4*2,3,
+ &2*2,1,2*2,2*0,-12,-14,-16,5*4122,441,443,20443,2*-2,2*-4,-2,-4,
+ &2*0,2112,-12,3122,2212,2112,2212,3*3122,3*4122,4132,4232,0,
+ &3*5122,5132,5232,0,2112,2212,2*2112,2212,2112,2*2212,3122,3212,
+ &3112,3122,3222,3112,3122,3222,3212,3322,3312,3322,3312,3122,3322,
+ &3312,-12,3*4122,2*4132,2*4232,4332,3*5122,5132,5232,5332,847*0/
+ DATA (KFDP(I,2),I= 1, 476)/3*1,2,4,6,8,1,3*2,1,3,5,7,2,3*3,2,4,
+ &6,8,3,3*4,1,3,5,7,4,3*5,2,4,6,8,5,3*6,1,3,5,7,6,5,3*7,2,4,6,8,7,
+ &4,6,3*8,1,3,5,7,8,5,7,2*11,12,11,12,2*11,2*13,14,13,14,13,11,13,
+ &-211,-213,-211,-213,-211,-213,3*-211,-321,-323,-321,-323,3*-321,
+ &4*-211,-213,-211,-213,-211,-213,-211,-213,-211,-213,6*-211,2*15,
+ &16,15,16,15,18,2*17,18,17,2*18,2*17,-1,-2,-3,-4,-5,-6,-7,-8,21,
+ &-1,-2,-3,-4,-5,-6,-7,-8,-11,-13,-15,-17,-1,-2,-3,-4,-5,-6,-7,-8,
+ &-11,-12,-13,-14,-15,-16,-17,-18,2,4,6,8,2,4,6,8,2,4,6,8,2,4,6,8,
+ &12,14,16,18,-1,-2,-3,-4,-5,-6,-7,-8,-11,-13,-15,-17,21,22,2*23,
+ &-24,-1,-2,-3,-4,-5,-6,-7,-8,-11,-12,-13,-14,-15,-16,-17,-18,-24,
+ &-37,22,25,2*36,2,4,6,8,2,4,6,8,2,4,6,8,2,4,6,8,12,14,16,18,23,22,
+ &25,-1,-2,-3,-4,-5,-6,-7,-8,-11,-13,-15,-17,21,22,2*23,-24,2*25,
+ &36,-1,-2,-3,-4,-5,-6,-7,-8,-11,-13,-15,-17,21,22,2*23,-24,25,2,4,
+ &6,8,12,14,16,18,25,-5,-6,21,11,-3,-4,-5,-6,-7,-8,-13,-15,-17,-82,
+ &12,14,-1,-3,11,13,15,1,4,3,4,1,3,5,3,5,6,4,21,22,4,7,5,2,4,6,8,2,
+ &4,6,8,2,4,6,8,2,4,6,8,12,14,16,18,14,2*0,14,111,211,111,-11,-13,
+ &11*12,11*14,2*211,2*213,211,20213,2*321,2*323,211,213,211,213,
+ &211,213,211,213,211,213,211,213,3*211,213,211,2*321,8*211,2*113,
+ &2*211,8*12,8*14,2*211,2*213,2*111,221,2*113,223,333,20213,211,
+ &2*321,323,2*311,313,-211,111,113,2*211,321,2*211,311,321,310,211/
+ DATA (KFDP(I,2),I= 477, 857)/-211,4*211,321,4*211,113,2*211,-321,
+ &16,5*12,5*14,3*211,3*213,211,2*111,2*113,2*-311,2*-313,-2112,
+ &3*321,323,2*-1,6*-11,6*-13,2*-15,211,213,20213,211,213,20213,431,
+ &433,431,433,311,313,311,313,311,313,-1,-4,-3,-4,-1,-3,6*-11,
+ &6*-13,2*-15,211,213,20213,211,213,20213,431,433,431,433,321,323,
+ &321,323,321,323,-1,-4,-3,-4,-1,-3,6*-11,6*-13,2*-15,211,213,
+ &20213,211,213,20213,431,433,431,433,221,331,333,221,331,333,221,
+ &331,333,-1,-4,-3,-4,-1,-3,-15,-3,-1,2*-11,2*-13,2*-15,-1,-4,-3,
+ &-4,-3,-4,-1,-4,2*12,2*14,2,3,2,3,2*12,2*14,2,1,22,11,22,111,-211,
+ &211,11,-211,13,-211,111,113,223,22,111,-82,21,3*0,111,22,-211,
+ &111,22,211,111,22,211,111,22,111,6*22,-211,22,-13,-11,-211,111,
+ &-211,2*111,-321,310,211,111,2*-211,221,22,-11,-13,-82,-11,-13,
+ &-15,-1,-2,-3,-4,2*21,3*0,211,-213,113,-211,111,223,213,113,211,
+ &111,223,211,111,-211,111,321,311,-211,111,211,111,-321,-311,411,
+ &421,111,-211,111,211,-311,311,-321,321,-82,21,3*0,211,-211,111,
+ &211,111,211,111,-211,111,311,321,-211,111,211,111,-321,-311,411,
+ &421,111,-211,111,-321,130,310,-211,111,-321,130,310,22,-82,22,21,
+ &3*0,211,111,-211,111,211,111,211,111,-211,111,321,311,-211,111,
+ &211,111,-321,-311,411,421,-211,211,-211,111,2*211,111,-211,211,
+ &111,211,-321,2*-311,-321,-311,311,-321,321,22,-82,22,21,3*0,111/
+ DATA (KFDP(I,2),I= 858,2000)/3*211,-311,22,-211,111,-211,111,
+ &-211,211,-213,113,223,221,211,111,211,111,2*211,213,113,223,221,
+ &22,211,111,211,111,4*211,-211,111,-211,111,-211,211,-211,211,321,
+ &311,321,311,-211,111,-211,111,-211,211,-211,2*211,111,211,111,
+ &4*211,-321,-311,-321,-311,411,421,411,421,-211,211,111,211,-321,
+ &130,310,22,-211,111,2*-211,-321,130,310,221,111,-321,130,310,221,
+ &-211,111,22,-82,22,21,3*0,111,-211,11,-11,13,-13,-211,111,-211,
+ &111,-11,-13,-82,211,111,221,111,4*22,-11,-13,-15,-1,-2,-3,-4,
+ &2*21,211,111,3*22,-211,111,22,11,7*12,7*14,-321,-323,-311,-313,
+ &-311,-313,211,213,211,213,211,213,111,221,331,113,223,111,221,
+ &113,223,321,323,321,-211,-213,111,221,331,113,223,333,10221,111,
+ &221,331,113,223,211,213,211,213,321,323,321,323,321,323,311,313,
+ &311,313,2*-1,-3,-1,2203,3201,3203,2203,2101,2103,2*0,11,13,15,
+ &-211,-213,-20213,-431,-433,3*3122,1,4,3,4,1,3,2*0,-211,11,22,111,
+ &211,22,-211,111,22,-211,111,211,2*22,0,-211,111,211,2*22,0,
+ &2*-211,111,22,111,211,22,211,2*-211,2*111,-211,2*211,111,211,
+ &-211,2*111,211,-321,-211,111,11,-211,111,211,111,22,111,2*22,
+ &-211,111,211,3*22,847*0/
+ DATA (KFDP(I,3),I= 1, 944)/75*0,14,6*0,2*16,2*0,5*111,310,130,
+ &2*0,2*111,310,130,321,113,211,223,221,2*113,2*211,2*223,2*221,
+ &2*113,221,113,2*213,-213,195*0,4*3,4*4,1,4,3,2*2,10*81,25*0,-211,
+ &3*111,-311,-313,-311,-321,-313,-323,111,221,331,113,223,-311,
+ &-313,-311,-321,-313,-323,111,221,331,113,223,22*0,111,113,2*211,
+ &-211,-311,211,111,3*211,-211,7*211,-321,-323,-311,-321,-313,-323,
+ &-211,-213,-321,-323,-311,-321,-313,-323,-211,-213,22*0,111,113,
+ &-311,2*-211,211,-211,310,-211,2*111,211,2*-211,-321,-211,2*211,
+ &-211,111,-211,2*211,0,221,331,333,321,311,221,331,333,321,311,
+ &20*0,3,0,-411,-413,-10413,-10411,-20413,-415,-411,-413,-10413,
+ &-10411,-20413,-415,-411,-413,16*0,-4,-1,-4,-3,2*-2,-421,-423,
+ &-10423,-10421,-20423,-425,-421,-423,-10423,-10421,-20423,-425,
+ &-421,-423,16*0,-4,-1,-4,-3,2*-2,-431,-433,-10433,-10431,-20433,
+ &-435,-431,-433,-10433,-10431,-20433,-435,-431,-433,19*0,-4,-1,-4,
+ &-3,2*-2,3*0,441,443,441,443,441,443,-4,-1,-4,-3,-4,-3,-4,-1,531,
+ &533,531,533,3,2,3,2,511,513,511,513,1,2,0,-11,0,2*111,-211,-11,
+ &11,-13,2*221,3*0,111,27*0,111,2*0,22,111,5*0,111,12*0,2*21,103*0,
+ &-211,2*111,-211,3*111,-211,111,211,14*0,111,6*0,111,-211,8*0,111,
+ &-211,9*0,111,-211,111,-211,4*0,111,-211,111,-211,8*0,111,-211,
+ &111,-211,4*0,111,-211,111,-211,11*0,-211,6*0,111,211,4*0,111/
+ DATA (KFDP(I,3),I= 945,2000)/13*0,2*111,211,-211,211,-211,7*0,
+ &-211,111,13*0,2*21,-211,111,6*0,2212,3122,3212,3214,2112,2114,
+ &2212,2112,3122,3212,3214,2112,2114,2212,2112,52*0,3*3,1,8*0,
+ &3*4122,8*0,4,1,4,3,2*2,3*0,2112,43*0,3322,861*0/
+ DATA (KFDP(I,4),I= 1,2000)/88*0,3*111,8*0,-211,0,-211,3*0,111,
+ &2*-211,0,111,0,2*111,113,221,111,-213,-211,211,195*0,13*81,41*0,
+ &111,211,111,211,7*0,111,211,111,211,35*0,2*-211,2*111,211,111,
+ &-211,2*211,2*-211,2*0,-211,111,-211,111,4*0,-211,111,-211,111,
+ &34*0,111,-211,3*111,3*-211,2*111,3*-211,4*0,-321,-311,3*0,-321,
+ &-311,20*0,-3,31*0,6*1,30*0,6*2,33*0,6*3,9*0,8*4,4*0,4*-5,4*0,
+ &2*-5,7*0,-11,264*0,111,-211,4*0,111,57*0,-211,111,5*0,-211,111,
+ &52*0,2101,2103,2*2101,19*0,6*2101,909*0/
+ DATA (KFDP(I,5),I= 1,2000)/90*0,111,16*0,111,7*0,111,0,2*111,
+ &303*0,-211,2*111,-211,111,-211,111,54*0,111,-211,3*111,-211,111,
+ &1510*0/
+
+C...LUDAT4, with character strings.
+ DATA (CHAF(I) ,I= 1, 281)/'d','u','s','c','b','t','l','h',
+ &2*' ','e','nu_e','mu','nu_mu','tau','nu_tau','chi','nu_chi',
+ &2*' ','g','gamma','Z','W','H',2*' ','reggeon','pomeron',2*' ',
+ &'Z''','Z"','W''','H''','A','H','eta_tech','LQ_ue','R',40*' ',
+ &'specflav','rndmflav','phasespa','c-hadron','b-hadron',
+ &'t-hadron','l-hadron','h-hadron','Wvirt','diquark','cluster',
+ &'string','indep.','CMshower','SPHEaxis','THRUaxis','CLUSjet',
+ &'CELLjet','table',' ','pi',2*'K',2*'D','D_s',2*'B','B_s','B_c',
+ &'pi','eta','eta''','eta_c','eta_b','eta_t','eta_l','eta_h',2*' ',
+ &'rho',2*'K*',2*'D*','D*_s',2*'B*','B*_s','B*_c','rho','omega',
+ &'phi','J/psi','Upsilon','Theta','Theta_l','Theta_h',2*' ','b_1',
+ &2*'K_1',2*'D_1','D_1s',2*'B_1','B_1s','B_1c','b_1','h_1','h''_1',
+ &'h_1c','h_1b','h_1t','h_1l','h_1h',2*' ','a_0',2*'K*_0',2*'D*_0',
+ &'D*_0s',2*'B*_0','B*_0s','B*_0c','a_0','f_0','f''_0','chi_0c',
+ &'chi_0b','chi_0t','chi_0l','chi_0h',2*' ','a_1',2*'K*_1',
+ &2*'D*_1','D*_1s',2*'B*_1','B*_1s','B*_1c','a_1','f_1','f''_1',
+ &'chi_1c','chi_1b','chi_1t','chi_1l','chi_1h',2*' ','a_2',
+ &2*'K*_2',2*'D*_2','D*_2s',2*'B*_2','B*_2s','B*_2c','a_2','f_2',
+ &'f''_2','chi_2c','chi_2b','chi_2t','chi_2l','chi_2h',2*' ','K_L',
+ &'K_S',8*' ','psi''',3*' ','Upsilon''',45*' ','pi_diffr'/
+ DATA (CHAF(I) ,I= 282, 500)/'n_diffr','p_diffr','rho_diff',
+ &'omega_di','phi_diff','J/psi_di',18*' ','Lambda',5*' ',
+ &'Lambda_c',' ',2*'Xi_c',6*' ','Lambda_b',' ',2*'Xi_b',6*' ','n',
+ &'p',' ',3*'Sigma',2*'Xi',' ',3*'Sigma_c',2*'Xi''_c','Omega_c',
+ &4*' ',3*'Sigma_b',2*'Xi''_b','Omega_b',4*' ',4*'Delta',
+ &3*'Sigma*',2*'Xi*','Omega',3*'Sigma*_c',2*'Xi*_c','Omega*_c',
+ &4*' ',3*'Sigma*_b',2*'Xi*_b','Omega*_b',114*' '/
+
+C...LUDATR, with initial values for the random number generator.
+ DATA MRLU/19780503,0,0,97,33,0/
+
+ END
+
+C*********************************************************************
+
+CDECK ID>, LUTAUD
+ SUBROUTINE LUTAUD(ITAU,IORIG,KFORIG,NDECAY)
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+
+C...Dummy routine, to be replaced by user, to handle the decay of a
+C...polarized tau lepton.
+C...Input:
+C...ITAU is the position where the decaying tau is stored in /LUJETS/.
+C...IORIG is the position where the mother of the tau is stored;
+C... is 0 when the mother is not stored.
+C...KFORIG is the flavour of the mother of the tau;
+C... is 0 when the mother is not known.
+C...Note that IORIG=0 does not necessarily imply KFORIG=0;
+C... e.g. in B hadron semileptonic decays the W propagator
+C... is not explicitly stored but the W code is still unambiguous.
+C...Output:
+C...NDECAY is the number of decay products in the current tau decay.
+C...These decay products should be added to the /LUJETS/ common block,
+C...in positions N+1 through N+NDECAY. For each product I you must
+C...give the flavour codes K(I,2) and the five-momenta P(I,1), P(I,2),
+C...P(I,3), P(I,4) and P(I,5). The rest will be stored automatically.
+
+ COMMON/LUJETS/K(4000,5),P(4000,5),V(4000,5),N
+ COMMON/LUDAT1/MSTU(200),PARU(200),MSTJ(200),PARJ(200)
+ SAVE /LUJETS/,/LUDAT1/
+
+C...Stop program if this routine is ever called.
+C...You should not copy these lines to your own routine.
+ NDECAY=ITAU+IORIG+KFORIG
+ WRITE(MSTU(11),5000)
+ IF(RLU(0).LT.10.) STOP
+
+C...Format for error printout.
+ 5000 FORMAT(1X,'Error: you did not link your LUTAUD routine ',
+ &'correctly.'/1X,'Dummy routine in JETSET file called instead.'/
+ &1X,'Execution stopped!')
+
+
+ RETURN
+ END
diff --git a/modules/sophia/sampling.f b/modules/sophia/sampling.f
new file mode 100644
index 0000000000000000000000000000000000000000..85c4ae4e4fc927de1e9c70e0a01f568ccb8b1de4
--- /dev/null
+++ b/modules/sophia/sampling.f
@@ -0,0 +1,592 @@
+c*****************************************************************************
+c**!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!***
+c**!! IF YOU USE THIS PROGRAM, PLEASE CITE: !!***
+c**!! A.M"ucke, Ralph Engel, J.P.Rachen, R.J.Protheroe and Todor Stanev, !!***
+c**!! 1999, astro-ph/9903478, to appear in Comp.Phys.Commun. !!***
+c**!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!***
+c*****************************************************************************
+c** Further SOPHIA related papers: ***
+c** (1) M"ucke A., et al 1999, astro-ph/9808279, to appear in PASA. ***
+c** (2) M"ucke A., et al 1999, to appear in: Proc. of the ***
+c** 19th Texas Symposium on Relativistic Astrophysics, Paris, France, ***
+c** Dec. 1998. Eds.: J.~Paul, T.~Montmerle \& E.~Aubourg (CEA Saclay) ***
+c** (3) M"ucke A., et al 1999, astro-ph/9905153, to appear in: Proc. of ***
+c** 19th Texas Symposium on Relativistic Astrophysics, Paris, France, ***
+c** Dec. 1998. Eds.: J.~Paul, T.~Montmerle \& E.~Aubourg (CEA Saclay) ***
+c** (4) M"ucke A., et al 1999, to appear in: Proc. of 26th Int.Cosmic Ray ***
+c** Conf. (Salt Lake City, Utah) ***
+c*****************************************************************************
+
+
+c**********************************************
+c** Routines/functions related to sampling ***
+c** photon energy and squared CMF energy: ***
+c**********************************************
+
+
+
+ subroutine sample_s(s,eps)
+
+c***********************************************************************
+c samples distribution of s: p(s) = (s-mp^2)sigma_Ngamma
+c rejection for s=[sth,s0], analyt.inversion for s=[s0,smax]
+c***********************************************************************
+c** Date: 20/01/98 **
+c** author: A.Muecke **
+c**********************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+
+ common/input/ tbb,E0,alpha1,alpha2,
+ & epsm1,epsm2,epsb,L0
+ COMMON /S_MASS1/ AM(49), AM2(49)
+
+ external functs,gauss,rndm
+ double precision functs,gauss,rndm
+
+c*** calculate smin,smax : ************************
+ xmpi = AM(7)
+ xmp = AM(L0)
+ Pp = sqrt(E0*E0-xmp*xmp)
+ smin = 1.1646D0
+ smax = max(smin,xmp*xmp+2.D0*eps*(E0+Pp))
+ if ((smax-smin).le.1.D-8) then
+ s = smin+rndm(0)*1.d-6
+ RETURN
+ endif
+ s0 = 10.D0
+c*** determine which method applies: rejection or analyt.inversion: **
+ sintegr1 = gauss(functs,smin,s0)
+ sintegr2 = gauss(functs,s0,smax)
+ if (smax.le.s0) then
+c rejection method:
+ nmethod=1
+ goto 41
+ endif
+ r1 = rndm(0)
+ quo = sintegr1/(sintegr1+sintegr2)
+ if (r1.le.quo) then
+c rejection method:
+ nmethod=1
+ else
+c analyt. inversion:
+ nmethod=2
+ endif
+
+ 41 continue
+
+
+c*** rejection method: ************************
+ if (nmethod.eq.1) then
+ 10 continue
+c*** sample s random between smin ... s0 **
+ r2 = rndm(0)
+ s = smin+r2*(smax-smin)
+c*** calculate p(s) = pes **********************
+ ps = functs(s)
+c*** rejection method to sample s *********************
+ r3 = rndm(0)
+c pmax is roughly p(s) at s=s0
+ pmax = 1300.D0/sintegr1
+ if (r3*pmax.le.ps/sintegr1) then
+ RETURN
+ else
+ goto 10
+ endif
+ endif
+
+c*** analyt. inversion method: *******************
+ if (nmethod.eq.2) then
+ r4 = rndm(0)
+ beta = 2.04D0
+ betai = 1.D0/beta
+ term1 = r4*(smax**beta)
+ term2 = (r4-1.D0)*(s0**beta)
+ s = (term1-term2)**betai
+ RETURN
+ endif
+
+ RETURN
+ END
+
+ subroutine sample_eps(eps,epsmin,epsmax)
+
+c****************************************************************************
+c samples distribution of epsilon p(epsilon) for blackbody spectrum if tbb>0
+c and power law \sim eps^-alpha, epsm1 [eV] < eps [eV] < epsm2 [eV],
+c eps in LAB frame if tbb \leq 0
+c****************************************************************************
+c** Date: 20/01/98 **
+c** author: A.Muecke **
+c**********************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+
+ common/input/ tbb,E0,alpha1,alpha2,
+ & epsm1,epsm2,epsb,L0
+ common/PLindex/ alphaxx
+ COMMON /S_MASS1/ AM(49), AM2(49)
+
+ external prob_epskt,prob_epspl,rndm,gauss,functs,probint_pl
+ double precision prob_epskt,prob_epspl,rndm,gauss
+ double precision functs,probint_pl
+
+ xmpi = AM(7)
+ xmp = AM(L0)
+ gammap = E0/xmp
+ betap = sqrt(1.-1./gammap/gammap)
+ Pp = sqrt(E0*E0-xmp*xmp)
+ 1 continue
+ facpmax = 1.6D0
+c*** for tbb<=0: power law photon spectrum n(eps) ~ eps^-alpha *********
+ if (tbb.gt.0.D0) then
+ epsm1 = (1.1646D0-xmp*xmp)/2.D0/(E0+Pp)
+ epsm1 = epsm1*1.D9
+ epsm2 = 0.007D0*tbb
+ epskt = 8.619D-5*tbb
+ epspmax = (3.D-3*((E0*epskt*1.D-9)**(-0.97D0))
+ & +0.047D0)/3.9D2*tbb
+ if (epsm1.gt.epsm2) then
+ print*,
+ & 'CMF energy is below threshold for nucleon energy '
+ & ,E0,' GeV !'
+ eps = 0.D0
+ RETURN
+ endif
+ cnorm = gauss(prob_epskt,epsm1,epsm2)
+ pmaxc = prob_epskt(epspmax)/cnorm
+ pmax = facpmax*pmaxc
+
+ else
+c*** determine distribution:
+ epsth = (1.1646D0-xmp*xmp)/2.D0/(E0+Pp)
+ epsth = epsth*1.D9
+ epsm1 = max(epsmin,epsth)
+ epsm2 = epsmax
+ if (epsm1.ge.epsm2) then
+ eps = 0.
+ RETURN
+ endif
+ endif
+
+ epsmx1 = epsm1
+ epsmx2 = epsm2
+ epsbx = epsb
+ epsdelta = 0.159368/E0*1.d9
+ epsxx = 126.D0/E0*1.d9
+ alpha12 = alpha2-alpha1
+ a1 = 1.D0
+ 10 continue
+c*** sample eps randomly between epsmin ... epsmax **
+ r1 = rndm(0)
+c*** calculate p(eps) = peps ***************************************
+ if (tbb.le.0.D0) then
+ rn = rndm(0)
+c*******************************************************************
+c... sample from straight power law (alpha = alpha2, epsb < epsm1):
+ if (alpha12.eq.0.D0.or.epsm1.ge.epsb) then
+ if (epsxx.ge.epsm2) then
+ alphaxx = alpha2
+ else if (epsxx.le.epsm1) then
+ alphaxx = (alpha2+2.D0)
+ else if (epsm1.lt.epsxx.and.epsxx.lt.epsm2) then
+ a2 = epxx*epsxx
+ alphaxx = alpha2
+ pintegr1 = a1*probint_pl(epsm1,epsxx,alphaxx)
+ alphaxx = (alpha2+2.D0)
+ pintegr2 = a2*probint_pl(epsxx,epsm2,alphaxx)
+ pintegr1 = pintegr1/(pintegr1+pintegr2)
+ if (rn.lt.pintegr1) then
+ alphaxx = alpha2
+ epsm2 = epsxx
+ ampl = a1
+ else if (pintegr1.le.rn.and.rn.lt.1.D0) then
+ alphaxx = alpha2+2.D0
+ epsm1 = epsxx
+ ampl = a2
+ endif
+ endif
+ endif
+c... sample from broken power law: input always epsm1 < epsb < epsm2
+ if (epsm1.lt.epsb) then
+c... determine where epsb,epsxx lies:
+ if (epsm1.lt.epsxx.and.epsxx.lt.epsb) then
+ a2 = epxx*epsxx
+ a3 = a2*(epsb**(alpha2-alpha1))
+ alphaxx = alpha1
+ pintegr1 = a1*probint_pl(epsm1,epsxx,alphaxx)
+ alphaxx = (alpha1+2.D0)
+ pintegr2 = a2*probint_pl(epsxx,epsb,alphaxx)
+ alphaxx = (alpha2+2.D0)
+ pintegr3 = a3*probint_pl(epsb,epsm2,alphaxx)
+ pintegr1 = pintegr1/(pintegr1+pintegr2+pintegr3)
+ pintegr2 = (pintegr1+pintegr2)/(pintegr1+pintegr2+pintegr3)
+ pintegr3 = 1.D0
+ if (rn.lt.pintegr1) then
+ alphaxx = alpha1
+ epsm2 = epsxx
+ ampl = a1
+ else if (pintegr1.le.rn.and.rn.lt.pintegr2) then
+ alphaxx = alpha1+2.D0
+ epsm1 = epsxx
+ epsm2 = epsb
+ ampl = a2
+ else if (pintegr2.le.rn.and.rn.le.pintegr3) then
+ alphaxx = alpha2+2.D0
+ epsm1 = epsb
+ ampl = a3
+ else
+ print*,'error in sampling broken power law: SAMPLE_EPS (1)!'
+ STOP
+ endif
+
+ else if (epsb.le.epsxx.and.epsxx.lt.epsm2) then
+ a2 = epsb**(alpha2-alpha1)
+ a3 = a2*epsxx*epsxx
+ alphaxx = alpha1
+ pintegr1 = a1*probint_pl(epsm1,epsb,alphaxx)
+ alphaxx = alpha2
+ pintegr2 = a2*probint_pl(epsb,epsxx,alphaxx)
+ alphaxx = (alpha2+2.D0)
+ pintegr3 = a3*probint_pl(epsxx,epsm2,alphaxx)
+ pintegr1 = pintegr1/(pintegr1+pintegr2+pintegr3)
+ pintegr2 = (pintegr1+pintegr2)/(pintegr1+pintegr2+pintegr3)
+ pintegr3 = 1.D0
+ if (rn.lt.pintegr1) then
+ alphaxx = alpha1
+ epsm2 = epsb
+ ampl = a1
+ else if (pintegr1.le.rn.and.rn.lt.pintegr2) then
+ alphaxx = alpha2
+ epsm1 = epsb
+ epsm2 = epsxx
+ ampl = a2
+ else if (pintegr2.le.rn.and.rn.le.pintegr3) then
+ alphaxx = alpha2+2.D0
+ epsm1 = epsxx
+ ampl = a3
+ else
+ print*,'error in sampling broken power law: SAMPLE_EPS (2)!'
+ STOP
+ endif
+
+ else if (epsxx.ge.epsm2) then
+ a2 = epsb**(alpha2-alpha1)
+ a3 = 0.D0
+ alphaxx = alpha1
+ pintegr1 = a1*probint_pl(epsm1,epsb,alphaxx)
+ alphaxx = alpha2
+ pintegr2 = a2*probint_pl(epsb,epsm2,alphaxx)
+ pintegr1 = pintegr1/(pintegr1+pintegr2)
+ pintegr2 = 1.D0
+ if (rn.lt.pintegr1) then
+ alphaxx = alpha1
+ epsm2 = epsb
+ ampl = a1
+ else if (pintegr1.le.rn.and.rn.le.pintegr2) then
+ alphaxx = alpha2
+ epsm1 = epsb
+ ampl = a2
+ else
+ print*,'error in sampling broken power law: SAMPLE_EPS (3)!'
+ STOP
+ endif
+
+ else if (epsxx.le.epsm1) then
+ a2 = epsb**(alpha2-alpha1)
+ a3 = 0.D0
+ alphaxx = (alpha1+2.D0)
+ pintegr1 = a1*probint_pl(epsm1,epsb,alphaxx)
+ alphaxx = (alpha2+2.D0)
+ pintegr2 = a2*probint_pl(epsb,epsm2,alphaxx)
+ pintegr1 = pintegr1/(pintegr1+pintegr2)
+ pintegr2 = 1.D0
+ if (rn.lt.pintegr1) then
+ alphaxx = alpha1+2.D0
+ epsm2 = epsb
+ ampl = a1
+ else if (pintegr1.le.rn.and.rn.le.pintegr2) then
+ alphaxx = alpha2+2.D0
+ epsm1 = epsb
+ ampl = a2
+ else
+ print*,'error in sampling broken power law: SAMPLE_EPS (4)!'
+ STOP
+ endif
+
+ endif
+cxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
+c... END: sample from broken power law:
+ endif
+c*****************************************************
+ if (alphaxx.eq.1.D0) then
+ term1 = r1*log(epsm2/epsm1)
+ eps = epsm1*exp(term1)
+ else
+ beta = 1.D0-alphaxx
+ betai = 1.D0/beta
+ term1 = r1*(epsm2**beta)
+ term2 = (r1-1.D0)*(epsm1**beta)
+ eps = (term1-term2)**betai
+ endif
+
+
+c******************************************************
+c*** for thermal spectrum: ***
+ else
+ eps = epsm1+r1*(epsm2-epsm1)
+ peps = prob_epskt(eps)/cnorm
+c endif
+c*** rejection method to sample eps *********************
+ r2 = rndm(0)
+ if (r2*pmax.gt.peps) then
+ goto 10
+ endif
+
+ endif
+
+ epsm1 = epsmx1
+ epsm2 = epsmx2
+ epsb = epsbx
+
+c... check maximum of epsilon distribution:
+ if (pmax.lt.peps) then
+ facpmax = facpmax + 0.1D0
+ goto 1
+ endif
+
+ RETURN
+ END
+
+
+ DOUBLE PRECISION function prob_epskt(eps)
+
+c*** calculates probability distribution for thermal photon field ***
+c*** with temerature tbb (in K), eps (in eV) *************
+c** Date: 20/01/98 **
+c** author: A.Muecke **
+c**********************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+ common/input/ tbb,E0,alpha1,alpha2,
+ & epsm1,epsm2,epsb,L0
+
+ external functs,photd,gauss
+ double precision functs,photd,gauss
+
+ xmpi = 0.135D0
+ xmp = 0.93827D0
+ Pp = sqrt(E0*E0-xmp*xmp)
+ gammap = E0/xmp
+ betap = sqrt(1.D0-1.D0/gammap/gammap)
+ deps = photd(eps,tbb)
+ if (deps.eq.0.D0) then
+ prob_epskt = 0.D0
+ RETURN
+ else
+c*** calculate \int_sth^smax ds (s-mp^2) sigma_pg *******
+c*** smin is for head-on collision **********************
+ smin = 1.1646D0
+ smax = max(smin,xmp*xmp+2.D0*eps/1.D9*E0*(1.D0+betap))
+ sintegr = gauss(functs,smin,smax)
+
+ prob_epskt = deps/eps/eps*sintegr/
+ & 8.D0/betap/E0/E0*1.D18*1.D6
+ endif
+
+ RETURN
+
+ END
+
+ DOUBLE PRECISION function prob_epspl(eps)
+
+c*** calculates probability distribution for power law photon field ***
+c*** n = anorm*eps^-alpha, eps=[epsm1,epsm2], eps in eV *************
+c** Date: 20/01/98 **
+c** author: A.Muecke **
+c**********************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+ common/input/ tbb,E0,alpha1,alpha2,
+ & epsm1,epsm2,epsb,L0
+
+ external functs,gauss
+ double precision functs,gauss
+
+ xmpi = 0.135D0
+ xmp = 0.93827D0
+ Pp = sqrt(E0*E0-xmp*xmp)
+ gammap = E0/xmp
+ betap = sqrt(1.D0-1.D0/gammap/gammap)
+ alpha12 = alpha2-alpha1
+ ampl = epsb**alpha12
+ if (eps.lt.epsb) then
+ deps = eps**(-alpha1)
+ else
+ deps = ampl*(eps**(-alpha2))
+ endif
+
+c*** calculate \int_sth^smax ds (s-mp^2) sigma_pg *******
+c*** smin is for head-on collision **********************
+ smin = 1.1646D0
+ smax = max(smin,xmp*xmp+2.D0*eps/1.D9*(E0+Pp))
+
+ sintegr = gauss(functs,smin,smax)
+
+ prob_epspl = deps/eps/eps*sintegr/
+ & 8.D0/betap/E0/E0*1.D18*1.D6
+
+ RETURN
+
+ END
+
+ DOUBLE PRECISION function probint_pl(epsi,epsf,p)
+
+c*** returns \int_epsi^epsf eps^-p **************
+c*** calling program is SAMPLE_EPS ****************
+c** Date: 03/03/99 **
+c** author: A.Muecke **
+c**********************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+ if (p.eq.1.D0) then
+ probint_pl = log(epsf/epsi)
+ else
+ p1 = 1.D0-p
+ probint_pl = ((epsf**p1)-(epsi**p1))/p1
+ endif
+
+ RETURN
+
+ END
+
+
+ DOUBLE PRECISION function functs(s)
+
+c*** returns (s-pm^2)*sigma_Ngamma **************
+c*** calling program is SAMPLE_S ****************
+c** Date: 20/01/98 **
+c** author: A.Muecke **
+c**********************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+ common/input/ tbb,E0,alpha1,alpha2,
+ & epsm1,epsm2,epsb,L0
+
+ external crossection
+ double precision crossection
+
+
+ pm = 0.93827D0
+ factor = (s-pm*pm)
+ epsprime = factor/2.D0/pm
+ sigma_pg = crossection(epsprime,3,L0)
+ functs = factor*sigma_pg
+
+ RETURN
+
+ END
+
+ DOUBLE PRECISION FUNCTION PHOTD(EPS,TBB)
+C **************************************************************
+C RETURNS THE DENSITY OF BLACKBODY RADIATION OF TEMPERATURE *
+C "TBB" DEGREES (DENS1). EPS IN eV, PHOTD IN #/(cm^3.eV) *
+C TSS, May '92 *
+C **************************************************************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ SAVE
+C CONVERT TEMPERATURE TO eV
+ EPH = EPS
+ EKT = 8.619D-5*TBB
+ EPHKT = EPS/EKT
+ IF (EPHKT .GT. 80.D0) GO TO 10
+ IF (EPHKT .LT. 1.D-4) GO TO 11
+ FEE = DEXP(EPHKT) - 1.D0
+ GO TO 12
+ 11 FEE = EPHKT
+ 12 BB = 1.318D13*EPH*EPH/FEE
+ GO TO 15
+ 10 BB = 0.D0
+ 15 PHOTD = BB
+ END
+
+
+ DOUBLE PRECISION function plinterpol(alpha)
+
+c*** interpolates p(Ep) to give the max. probability p(eps) for ***
+c*** a given initial proton energy ***
+c** Date: 20/01/98 **
+c** author: A.Muecke **
+c**********************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+ SAVE
+
+ DIMENSION AINDEX(4), A(4)
+ DATA A / 0.D0,1.D0,2.D0,3.D0/
+ DATA AINDEX / 8.D8,5.D8,5.D8,1.D9/
+
+ plinterpol = 0.D0
+
+ do 1 ni=1,3
+ p1 = A(ni)
+ p2 = A(ni+1)
+ if (alpha.le.p2.and.alpha.gt.p1) then
+ tang = (log10(AINDEX(ni+1))-log10(AINDEX(ni)))/(p2-p1)
+ plinterpol = log10(AINDEX(ni))+(alpha-p1)*tang
+ plinterpol = 10.D0**plinterpol
+ endif
+ 1 continue
+
+ if (alpha.eq.0.D0) plinterpol = 5.D8
+
+ if (plinterpol.eq.0.D0) then
+ print*,'interpolation not sucessful !'
+ pause
+ endif
+
+ END
+
+ DOUBLE PRECISION function f_epspl(eps)
+
+c*** gives energy density law of power law photon field ***
+c*** f(epsilon) = eps^-alpha, eps=[epsm1,epsm2], eps in eV *************
+c** Date: 14/03/99 **
+c** author: A.Muecke **
+c**********************
+ IMPLICIT DOUBLE PRECISION (A-H,O-Z)
+ IMPLICIT INTEGER (I-N)
+
+ SAVE
+
+ common/input/ tbb,E0,alpha1,alpha2,
+ & epsm1,epsm2,epsb,L0
+
+
+ alpha12 = alpha2-alpha1
+ ampl = epsb**alpha12
+ if (eps.lt.epsb) then
+ f_epspl = eps*(eps**(-alpha1))
+ else
+ f_epspl = eps*ampl*(eps**(-alpha2))
+ endif
+
+ RETURN
+
+ END
+
+
diff --git a/src/modules/sophia/CMakeLists.txt b/src/modules/sophia/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9f5da49e86eb67261d606ba2d066e872964c916c
--- /dev/null
+++ b/src/modules/sophia/CMakeLists.txt
@@ -0,0 +1,32 @@
+set (input_dir ${PROJECT_SOURCE_DIR}/src/modules/sophia)
+set (output_dir ${PROJECT_BINARY_DIR}/corsika/modules/sophia)
+
+file (MAKE_DIRECTORY ${output_dir})
+
+add_custom_command (
+ OUTPUT ${output_dir}/Generated.inc
+ COMMAND ${input_dir}/code_generator.py
+ ${PROJECT_BINARY_DIR}/corsika/framework/core/particle_db.pkl
+ ${input_dir}/sophia_codes.dat
+ DEPENDS ${input_dir}/code_generator.py
+ ${input_dir}/sophia_codes.dat
+ ${PROJECT_BINARY_DIR}/corsika/framework/core/particle_db.pkl
+ GenParticlesHeaders
+ WORKING_DIRECTORY
+ ${output_dir}/
+ COMMENT "Generate conversion tables for particle codes sophia <-> CORSIKA"
+ VERBATIM
+ )
+
+set_source_files_properties (
+ ${output_dir}/Generated.inc
+ PROPERTIES GENERATED TRUE
+)
+
+add_custom_target (SourceDirLinkSoph DEPENDS ${output_dir}/Generated.inc)
+add_dependencies (CORSIKA8 SourceDirLinkSoph)
+
+install (
+ FILES ${output_dir}/Generated.inc
+ DESTINATION include/corsika/modules/sophia
+ )
diff --git a/src/modules/sophia/code_generator.py b/src/modules/sophia/code_generator.py
new file mode 100755
index 0000000000000000000000000000000000000000..b341dc1d699708ebba51a2ffa30e4e8186488711
--- /dev/null
+++ b/src/modules/sophia/code_generator.py
@@ -0,0 +1,138 @@
+#!/usr/bin/env python3
+
+# (c) Copyright 2018-2019 CORSIKA Project, corsika-project@lists.kit.edu
+#
+# See file AUTHORS for a list of contributors.
+#
+# This software is distributed under the terms of the GNU General Public
+# Licence version 3 (GPL Version 3). See file LICENSE for a full version of
+# the license.
+
+
+import pickle, sys, itertools
+
+
+
+def load_particledb(filename):
+ '''
+ loads the pickled particle_db (which is an OrderedDict)
+ '''
+ with open(filename, "rb") as f:
+ particle_db = pickle.load(f)
+ return particle_db
+
+
+
+def read_sophia_codes(filename, particle_db):
+ '''
+ reads to sophia codes data file
+
+ For particls known to sophia, add 'sophia_code' and 'sophia_xsType' to particle_db
+ '''
+ with open(filename) as f:
+ for line in f:
+ line = line.strip()
+ if len(line)==0 or line[0] == '#':
+ continue
+ identifier, sib_code, canInteractFlag, xsType = line.split()
+ try:
+ particle_db[identifier]["sophia_code"] = int(sib_code)
+ particle_db[identifier]["sophia_xsType"] = xsType
+ except KeyError as e:
+ raise Exception("Identifier '{:s}' not found in particle_db".format(identifier))
+
+
+
+
+def generate_sophia_enum(particle_db):
+ '''
+ generates the enum to access sophia particles by readable names
+ '''
+ output = "enum class sophiaCode : int8_t {\n"
+ for identifier, pData in particle_db.items():
+ if 'sophia_code' in pData:
+ output += " {:s} = {:d},\n".format(identifier, pData['sophia_code'])
+ output += "};\n"
+ return output
+
+
+
+def generate_corsika2sophia(particle_db):
+ '''
+ generates the look-up table to convert corsika codes to sophia codes
+ '''
+ string = "std::array<sophiaCode, {:d}> constexpr corsika2sophia = {{\n".format(len(particle_db))
+ for identifier, pData in particle_db.items():
+ if pData['isNucleus']: continue
+ if 'sophia_code' in pData:
+ string += " sophiaCode::{:s}, \n".format(identifier)
+ else:
+ string += " sophiaCode::Unknown, // {:s}\n".format(identifier + ' not implemented in sophia')
+ string += "};\n"
+ return string
+
+
+
+def generate_corsika2sophia_xsType(particle_db):
+ '''
+ generates the look-up table to convert corsika codes to sophia codes
+ '''
+ string = "std::array<sophiaXSClass, {:d}> constexpr corsika2sophiaXStype = {{\n".format(len(particle_db))
+ for identifier, pData in particle_db.items():
+ if pData['isNucleus']: continue
+ if 'sophia_xsType' in pData:
+ string += " sophiaXSClass::{:s}, // {:s}\n".format(pData['sophia_xsType'], identifier)
+ else:
+ string += " sophiaXSClass::CannotInteract, // {:s}\n".format(identifier + ' not implemented in sophia')
+ string += "};\n"
+ return string
+
+
+def generate_sophia2corsika(particle_db) :
+ '''
+ generates the look-up table to convert sophia codes to corsika codes
+ '''
+ string = ""
+
+ minID = 0
+ for identifier, pData in particle_db.items() :
+ if 'sophia_code' in pData:
+ minID = min(minID, pData['sophia_code'])
+
+ string += "sophiaCodeIntType constexpr minsophia = {:d};\n\n".format(minID)
+
+ pDict = {}
+ for identifier, pData in particle_db.items() :
+ if 'sophia_code' in pData:
+ sib_code = pData['sophia_code'] - minID
+ pDict[sib_code] = identifier
+
+ nPart = max(pDict.keys()) - min(pDict.keys()) + 1
+ string += "std::array<corsika::Code, {:d}> constexpr sophia2corsika = {{\n".format(nPart)
+
+ for iPart in range(nPart) :
+ if iPart in pDict:
+ identifier = pDict[iPart]
+ else:
+ identifier = "Unknown"
+ string += " corsika::Code::{:s}, \n".format(identifier)
+
+ string += "};\n"
+ return string
+
+if __name__ == "__main__":
+ if len(sys.argv) != 3:
+ print("usage: {:s} <particle_db.pkl> <sophia_codes.dat>".format(sys.argv[0]), file=sys.stderr)
+ sys.exit(1)
+
+ print("code_generator.py for sophia")
+
+ particle_db = load_particledb(sys.argv[1])
+ read_sophia_codes(sys.argv[2], particle_db)
+
+ with open("Generated.inc", "w") as f:
+ print("// this file is automatically generated\n// edit at your own risk!\n", file=f)
+ print(generate_sophia_enum(particle_db), file=f)
+ print(generate_corsika2sophia(particle_db), file=f)
+ print(generate_sophia2corsika(particle_db), file=f)
+ print(generate_corsika2sophia_xsType(particle_db), file=f)
diff --git a/src/modules/sophia/sophia_codes.dat b/src/modules/sophia/sophia_codes.dat
new file mode 100644
index 0000000000000000000000000000000000000000..1d7a8af60a6ec376067b5a9196754212119ef1d7
--- /dev/null
+++ b/src/modules/sophia/sophia_codes.dat
@@ -0,0 +1,75 @@
+# input file for particle conversion to/from sophia
+# the format of this file is: "corsika-identifier" "sophia-id" "can-interact-in-sophia" "cross-section-type"
+
+# The unknown particle is to handle all particles that are not known to sophia.
+# It is important that sophia-id does not overlap with any existing sophia particle!
+# Be careful
+Unknown 0 0 CannotInteract
+
+# Here is the list of particles known to sophia
+Electron 3 0 CannotInteract
+Positron 2 0 CannotInteract
+NuE 15 0 CannotInteract
+NuEBar 16 0 CannotInteract
+MuMinus 5 0 CannotInteract
+MuPlus 4 0 CannotInteract
+NuMu 17 0 CannotInteract
+NuMuBar 18 0 CannotInteract
+Photon 1 1 Photon
+Pi0 6 0 CannotInteract
+# rho0 could interact but sophia has no cross section/interaction length. was used for gamma had int
+Rho0 27 0 CannotInteract
+K0Long 11 0 CannotInteract
+K0 21 0 CannotInteract
+K0Bar 22 0 CannotInteract
+PiPlus 7 0 CannotInteract
+PiMinus 8 0 CannotInteract
+RhoPlus 25 0 CannotInteract
+RhoMinus 26 0 CannotInteract
+Eta 23 0 CannotInteract
+EtaPrime 24 0 CannotInteract
+Omega 32 0 CannotInteract
+K0Short 12 0 CannotInteract
+KStar0 30 0 CannotInteract
+KStar0Bar 31 0 CannotInteract
+KPlus 9 0 CannotInteract
+KMinus 10 0 CannotInteract
+KStarPlus 28 0 CannotInteract
+KStarMinus 29 0 CannotInteract
+Neutron 14 0 CannotInteract
+AntiNeutron -14 0 CannotInteract
+Delta0 42 0 CannotInteract
+Delta0Bar -42 0 CannotInteract
+DeltaMinus 43 0 CannotInteract
+DeltaPlusBar -43 0 CannotInteract
+Proton 13 0 CannotInteract
+AntiProton -13 0 CannotInteract
+DeltaPlus 41 0 CannotInteract
+DeltaMinusBar -41 0 CannotInteract
+DeltaPlusPlus 40 0 CannotInteract
+DeltaMinusMinusBar -40 0 CannotInteract
+SigmaMinus 36 0 CannotInteract
+SigmaPlusBar -36 0 CannotInteract
+SigmaStarMinus 46 0 CannotInteract
+SigmaStarPlusBar -46 0 CannotInteract
+SigmaStarPlus 44 0 CannotInteract
+SigmaStarMinusBar -44 0 CannotInteract
+SigmaStar0 45 0 CannotInteract
+SigmaStar0Bar -45 0 CannotInteract
+Lambda0 39 0 CannotInteract
+Lambda0Bar -39 0 CannotInteract
+Sigma0 35 0 CannotInteract
+Sigma0Bar -35 0 CannotInteract
+SigmaPlus 34 0 CannotInteract
+SigmaMinusBar -34 0 CannotInteract
+XiMinus 38 0 CannotInteract
+XiPlusBar -38 0 CannotInteract
+Xi0 37 0 CannotInteract
+Xi0Bar -37 0 CannotInteract
+XiStarMinus 48 0 CannotInteract
+XiStarPlusBar -48 0 CannotInteract
+XiStar0 47 0 CannotInteract
+XiStar0Bar -47 0 CannotInteract
+OmegaMinus 49 0 CannotInteract
+OmegaPlusBar -49 0 CannotInteract
+Phi 33 0 CannotInteract
\ No newline at end of file