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c$Id: make22.f,v 1.36 2003/05/02 11:06:54 weber Exp $
C####C##1#########2#########3#########4#########5#########6#########7##
subroutine make22(iio,e,ii1,iiz1,mm1,xfac1,ii2,iiz2,mm2,xfac2)
c
cinput iio : label for exit-channel
cinput e : $\sqrt{s}$ of process
cinput ii1 : ID of incoming particle 1
cinput iiz1 : $2\cdot I_3$ of incoming particle 1
cinput mm1 : mass of incoming particle 1
cinput xfac1 : scaling factor for preformed hadron
cinput ii2 : ID of incoming particle 2
cinput iiz2 : $2\cdot I_3$ of incoming particle 2
cinput mm2 : mass of incoming particle 2
cinput xfac2 : scaling factor for preformed hadron
c
c output: exit channel via common-blocks in {\tt newpart.f}
c
c {\tt make22} generates the final state for all scatterings and
c decays. Due to the diverse nature of the interactions handled
c many special cases have to be taken care of. The label {\tt iio}
c matches in most cases the respective label in subroutine {\tt crossx},
c which returns the respective partial cross sections.
c
C####C##1#########2#########3#########4#########5#########6#########7##
implicit none
include 'coms.f'
include 'options.f'
include 'newpart.f'
include 'comres.f'
integer io,iio,i1,i2,i3,i4,i,k,i1p,i1m,i2p,i2m
integer ifqrk1,ifqrk2,ifdiq1,ifdiq2,ifqrk3,ifqrk4,ifdiq3,ifdiq4
integer iq1(2),iq2(3),kq1,kq2,kqq1,kqq2,iii,iff(3)
real*8 sig,e,m1,m2,m3,m4,gam,mm1,mm2,m1m,m2m,xfac1,xfac2
integer iz1,iz2,iz3,iz4,errflg,icnt,ntry,ib1,ib2,i1old,i2old
logical bit
c...functions
integer isoit,whichres
real*8 getmass,fmsr,ranf,pcms,massit,widit,mminit
c...vacuum quantumnumber(s) for special string decay (don't touch)
real*8 valint(1)
common /values/ valint
c...string
real*8 b1,b2,ba1(3),ba2(3)
integer j,l,ii1,ii2,iiz1,iiz2,iexopt,iddum,ibar,jbar
logical fboost,switips
integer ident(2,mprt)
real*8 part(9,mprt),ms1,ms2,msmin1,msmin2,tau,esum
bit=.true.
switips=.false.
io=mod(iio,200)
i1=ii1
i2=ii2
iz1=iiz1
iz2=iiz2
m1=mm1
m2=mm2
icnt=0
ntry=0
ibar=0
if(iabs(i1).lt.minmes)ibar=ibar+isign(1,i1)
if(iabs(i2).lt.minmes)ibar=ibar+isign(1,i2)
c in case of a MB-reaction, sort particles (but keep track of
c any id-switch with the 'switips'-flag)
if(iabs(i1).ge.minmes.and.iabs(i1).le.maxmes.and.
& iabs(i2).ge.minbar.and.iabs(i2).le.maxbar)then
call swpizm(i1,iz1,m1,i2,iz2,m2)
switips=.true.
endif
if(i1+i2.eq.0.and.iz1+iz2.eq.0.and.CTOption(20).ne.0.and.
. io.gt.20)goto 27 !e+e-
if(io.lt.0)goto(100,100,100,100,100,100,100,29)-io
c if(i1+i2.gt.2)write(6,*)'make22:',i1,i2
ctp060202 1007 continue
goto(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,9,17,9,17,20,
,9,13,23,14,12,26,27,15,14,100,29,100,14,15,14,36,36,13)io
write(6,*)'make22: unknown channel requested io:',io
write(6,*)' ',e,i1,iz1,m1,i2,iz2,m2
stop
1 continue
c...pp->ND
i3=minnuc
i4=mindel
m3=massit(i3)
call getmas(massit(i4),widit(i4),i4,isoit(i4),mminit(i4),
. e-m3,m3,m4)
if(ranf(0).gt.0.5d0)call swpizm(i3,iz3,m3,i4,iz4,m4)
goto 1008
2 continue
c...pp->pp*
i3=minnuc
m3=massit(i3)
if(bit)call getres(io,e,minnuc+1,maxnuc,i4)
call getmas(massit(i4),widit(i4),i4,isoit(i4),mminit(i4),
. e-m3,m3,m4)
if(ranf(0).gt.0.5d0)call swpizm(i3,iz3,m3,i4,iz4,m4)
goto 1008
3 continue
c...pp->ND*
i3=minnuc
m3=massit(i3)
if(bit)call getres(io,e,mindel+1,maxdel,i4)
call getmas(massit(i4),widit(i4),i4,isoit(i4),mminit(i4),
. e-m3,m3,m4)
if(ranf(0).gt.0.5d0)call swpizm(i3,iz3,m3,i4,iz4,m4)
goto 1008
4 continue
c...pp->DD
i3=mindel
i4=mindel
call getmas(massit(i3),widit(i3),i3,isoit(i3),
. mminit(i4),e-mminit(i4),mminit(i4),m3)
call getmas(massit(i4),widit(i4),i4,isoit(i4),mminit(i4),
. e-m3,m3,m4)
if(ranf(0).gt.0.5d0)call swpizm(i3,iz3,m3,i4,iz4,m4)
goto 1008
5 continue
c...pp->DN*, DN* with factor 4/3
i3=mindel
if(bit)call getres(io,e,minnuc+1,maxnuc,i4)
call getmas(massit(i3),widit(i3),i3,isoit(i3),
. mminit(i3),e-mminit(i4),mminit(i4),m3)
call getmas(massit(i4),widit(i4),i4,isoit(i4),mminit(i4),
. e-m3,m3,m4)
if(ranf(0).gt.0.5d0)call swpizm(i3,iz3,m3,i4,iz4,m4)
goto 1008
6 continue
c...pp->DD*, DN* with factor 4/3
i3=mindel
if(bit)call getres(io,e,mindel+1,maxdel,i4)
call getmas(massit(i3),widit(i3),i3,isoit(i3),
. mminit(i3),e-mminit(i4),mminit(i4),m3)
call getmas(massit(i4),widit(i4),i4,isoit(i4),mminit(i4),
. e-m3,m3,m4)
if(ranf(0).gt.0.5d0)call swpizm(i3,iz3,m3,i4,iz4,m4)
goto 1008
7 continue
c...pp -> generate N*N*,N*D*,D*D*
m3=fmsr(mminit(mindel),e-mresmin)
m4=fmsr(mminit(mindel),e-m3)
if(bit)i3=whichres(m3,3)
if(bit)i4=whichres(m4,3)
if(ranf(0).gt.0.5d0)call swpizm(i3,iz3,m3,i4,iz4,m4)
goto 1008
8 continue
c...ND->DD
i3=mindel
i4=mindel
call getmas(massit(i3),widit(i3),i3,isoit(i3),
. mminit(i4),e-mminit(i4),mminit(i4),m3)
call getmas(massit(i4),widit(i4),i4,isoit(i4),mminit(i4),
. e-m3,m3,m4)
if(ranf(0).gt.0.5d0)call swpizm(i3,iz3,m3,i4,iz4,m4)
goto 1008
9 continue
write(6,*)'make22: channel no.',io,'not implemented.'
stop
10 continue
c...MB->B',MM->M* annihilations
call anndec(0,m1,i1,iz1,m2,i2,iz2,e,sig,gam)
goto 2002
c return
11 continue
c...MM->M'
call anndec(0,m1,i1,iz1,m2,i2,iz2,e,sig,gam)
goto 2002
c return
12 continue
write(6,*)'make22: channel no.',io,'should correspond to',
,'total cross section, i.e. make22 should not be called.'
stop
13 continue
c...elastic scattering
c
if(switips)then
call swpizm(i1,iz1,m1,i2,iz2,m2)
switips=.false.
endif
call setizm(i1,iz1,m1,i2,iz2,m2,i3,iz3,m3,i4,iz4,m4)
if(mminit(i4)+mminit(i3).gt.e)then
ctp060926 write(6,*)'make22(el):threshold violated'
ctp060926 write(6,*)'m3:',m3,mminit(i3)
ctp060926 write(6,*)'m4:',m4,mminit(i4)
else
c
c
if(m3.lt.mminit(i3))m3=mminit(i3)
if(m4.lt.mminit(i4))m4=mminit(i4)
end if
goto 2001
14 continue
c...inelastic scattering (aqm for nonstrange resonances)
c for arbitrary resonances getinw should be modified
c arbitrary particles are excited (whithout charge exchange)
c...get minimal masses
call getirg(i1,i1m,i1p)
m1m=mminit(i1m)
call getirg(i2,i2m,i2p)
m2m=mminit(i2m)
if(e-m1m-m2m.le.0d0)then
c...elastic scattering
call setizm(i1,iz1,m1,i2,iz2,m2,i3,iz3,m3,i4,iz4,m4)
goto 2001
c return
end if
c...masses
if(ranf(0).lt.5d-1)then
m3=fmsr(m1m,e-m2m)
m4=fmsr(m2m,e-m3)
else
m4=fmsr(m2m,e-m1m)
m3=fmsr(m1m,e-m4)
end if
if(e-m3-m4.lt.0d0)goto 13
c...itype3
if(i1m.lt.i1p.and.widit(i1m).lt.1d-3.and.
. m3.le.massit(i1m+1)-0.5*widit(i1m+1))then
c...lowest itype of this kind of particles is stable
c & mass .lt. approximate minimal mass of lowest itype + 1
m3=massit(i1m)
i3=i1m
else if(i1m.eq.i1p.and.widit(i1m).lt.1d-3) then
c...class with only one narrow particle
i3=i1
m3=massit(i3)
else
c...itypes of this kind are all unstable
call whichi(i3,i1m,i1p,m3)
end if
c...itype4
if(i2m.lt.i2p.and.widit(i2m).lt.1d-3.and.
. m4.le.massit(i2m+1)-0.5*widit(i2m+1))then
c...lowest itype of this kind of particles is stable
m4=massit(i2m)
i4=i2m
else if(i2m.eq.i2p.and.widit(i2m).lt.1d-3) then
c...class with only one narrow particle
i4=i2
m4=massit(i4)
else
c...itypes of this kind are all unstable
call whichi(i4,i2m,i2p,m4)
end if
c...no charge transfer
iz3=iz1
iz4=iz2
i3=isign(i3,ii1)
i4=isign(i4,ii2)
goto 2001
c return
15 continue
c...XX -> 2 strings
if(CTOption(12).ne.0)then
write(6,*)' *** error(make22): string section is called ',
. 'while strings are switched off:CTOption(12).ne.0'
stop
end if
c
if(switips)then
call swpizm(i1,iz1,m1,i2,iz2,m2)
switips=.false.
endif
c store old itypes
i1old=i1
i2old=i2
155 continue
c allow for deexcitation: 'excitation' starts from groundstate
if(iabs(i1).ge.minmes)then
c.. meson resonances may also be deexcitated: assign the particle
c id's of the lowest multiplet (with the same quark content)
call ityp2id(i1,iz1,iq1(1),iq1(2))
if(iabs(iq1(1)).gt.iabs(iq1(2)))then
iddum=iq1(1)
iq1(1)=iq1(2)
iq1(2)=iddum
endif
iddum=isign(100*iabs(iq1(1))+10*iabs(iq1(2)),iq1(1))
call id2ityp(iddum,0d0,i1,iz1)
else
call getirg(i1,i1m,i1p)
endif
c same for second particle
if(iabs(i2).ge.minmes)then
call ityp2id(i2,iz2,iq1(1),iq1(2))
if(iabs(iq1(1)).gt.iabs(iq1(2)))then
iddum=iq1(1)
iq1(1)=iq1(2)
iq1(2)=iddum
endif
iddum=isign(100*iabs(iq1(1))+10*iabs(iq1(2)),iq1(1))
call id2ityp(iddum,0d0,i2,iz2)
else
call getirg(i2,i2m,i2p)
endif
c
c BEWARE: now i1 and i2 do not contain anymore the ityps of the ingoing
c particles, but the ityps of the lowest possible states (groundstates).
c This is needed in order for the string-excitation to be able to
c excite ALL states and not only those above the state of the ingoing
c particle.
c If you need the old ityps (i.e. for elastic scattering) then reset them
c via i1old and i2old
c if the incoming masses are changed due to excitation, then the
c new masses should not be lower than:
m1m=mminit(i1)
m2m=mminit(i2)
c..discriminate between BB and MB collisions:
ib1=1
ib2=1
if(iabs(i1).ge.minmes)ib1=0
if(iabs(i2).ge.minmes)ib2=0
c set minimum energy for the two strings
msmin1=m1m+CTParam(2)
msmin2=m2m+CTParam(2)
c no (meson) string below 1 gev:
if(msmin1.lt.1d0)msmin1=1d0
if(msmin2.lt.1d0)msmin2=1d0
c if energy too low: do elastic collision
if(m1m+m2m+CTParam(34).ge.e)then
ctp060926 write(*,*)'make22: not enough energy for string exc. ->elastic/
ctp060926 &deexcitation'
ctp060926 write(*,*)' i1, i2, m1, m2, e: ',i1,i2,m1,m2,e
i1=i1old
i2=i2old
goto 13
endif
c convert to quark-IDs
call ityp2id(i1,iz1,ifdiq1,ifqrk1)
call ityp2id(i2,iz2,ifdiq2,ifqrk2)
iexopt=CTOption(22)
81 continue
c 100 tries for excitation, otherwise elastic scattering
ntry=ntry+1
if(ntry.gt.100)then
ctp060926 write(*,*)'make22: too many tries for string exc. ->elastic/
ctp060926 & deexcitation'
ctp060926 write(*,*)' i1, i2, m1, m2, e: ',i1,i2,m1,m2,e
i1=i1old
i2=i2old
goto 13
endif
c string-excitation:
c get string masses ms1,ms2 and the leading quarks
call STREXCT(IFdiq1,IFqrk1,ib1,M1m,
& ifdiq2,ifqrk2,ib2,M2m,E,
& iexopt,
& ba1,ms1,ba2,ms2,
& ifdiq3,ifqrk3,ifdiq4,ifqrk4)
c the boost parameters are now fixed for the masses ms1, ms2. If the
c masses will be changed, set the parameter fboost to "false":
fboost=.true.
c accept deexcitation of one of the hadrons:
if(ms1.le.msmin1.and.ms2.ge.msmin2)then
ms1=massit(i1)
fboost=.false.
else if(ms2.le.msmin2.and.ms1.ge.msmin1)then
ms2=massit(i2)
fboost=.false.
c don't accept elastic-like (both masses too low):
else if(ms1.lt.msmin1.and.ms2.lt.msmin2)then
goto 81
endif
c in case of deexcitation new masses are necessary
c single diffractive, mass excitation according 1/m
if(ms1.le.msmin1)then
ms2=fmsr(msmin2,e-ms1)
fboost=.false.
elseif(ms2.le.msmin2)then
ms1=fmsr(msmin1,e-ms2)
fboost=.false.
endif
c quark-quark scattering -> only elastic !
if(xfac1.lt..999d0.and.xfac2.lt..999d0
& .and.ranf(0).lt..25) then
i1=i1old
i2=i2old
goto 13
endif
c single diffractive if one particle is a quark state,
c mass excitation according 1/m
if(xfac1.lt..999d0.and.ranf(0).lt..5)then
ms1=massit(i1)
ms2=fmsr(msmin2,e-ms1)
fboost=.false.
elseif(xfac2.lt..999d0.and.ranf(0).lt..5)then
ms2=massit(i2)
ms1=fmsr(msmin1,e-ms2)
fboost=.false.
endif
c take care that the particles will be able to decay lateron:
if(ms1.lt.m1m)then
ms1=m1m
fboost=.false.
endif
if(ms2.lt.m2m)then
ms2=m2m
fboost=.false.
endif
c avoid energy conservation violation
if(ms1+ms2.gt.e)goto 155
if(CTOption(22).ne.1.or..not.fboost)then
c the boost parameters have to be calculated:
b1=2.*e*pcms(e,ms1,ms2)/(e**2+ms1**2-ms2**2)
b2=2.*e*pcms(e,ms1,ms2)/(e**2-ms1**2+ms2**2)
ba1(3)=+b1
ba2(3)=-b2
do 151 j=1,2
ba1(j)=0d0
151 ba2(j)=0d0
end if
c now write information to newpart common-blocks
mstring(1)=ms1
mstring(2)=ms2
c string#1
if(ms1.le.msmin1)then
nstring1=1
l=1
do j=1,3
part(j,l)=0d0
part(j+5,l)=0d0
enddo
part(4,l)=ms1
part(4+5,l)=0d0
part(5,l)=ms1
ident(1,l)=i1
ident(2,l)=iz1
else
call qstring(ifdiq3,ifqrk3,ms1,part,ident,nstring1)
if(nstring1.eq.0) goto 155
end if
esum=0d0
jbar=0
do l=1,nstring1
pnew(5,l)=part(5,l)
itypnew(l)=ident(1,l)
if(iabs(ident(1,l)).lt.minmes)jbar=jbar+isign(1,ident(1,l))
i3new(l)=ident(2,l)
do j=1,4
pnew(j,l)=part(j,l)
xnew(j,l)=part(j+5,l)
enddo
pnew(3,l)=part(3,l)
xnew(3,l)=part(3+5,l)
call rotbos(0d0,0d0,ba1(1),ba1(2),ba1(3),
, pnew(1,l),pnew(2,l),pnew(3,l),pnew(4,l))
call rotbos(0d0,0d0,ba1(1),ba1(2),ba1(3),
, xnew(1,l),xnew(2,l),xnew(3,l),xnew(4,l))
esum=esum+pnew(4,l)
enddo
call leadhad(1,nstring1,1)
c string #2
if(ms2.le.msmin2) then
nstring2=1
l=1
do j=1,3
part(j,l)=0d0
part(j+5,l)=0d0
enddo
part(4,l)=ms2
part(4+5,l)=0d0
part(5,l)=ms2
ident(1,l)=i2
ident(2,l)=iz2
else
call qstring(ifdiq4,ifqrk4,ms2,part,ident,nstring2)
if(nstring2.eq.0) goto 155
end if
esum=0d0
do l=1,nstring2
pnew(5,nstring1+l)=part(5,l)
itypnew(nstring1+l)=ident(1,l)
if(iabs(ident(1,l)).lt.minmes)jbar=jbar+isign(1,ident(1,l))
i3new(nstring1+l)=ident(2,l)
do j=1,4
pnew(j,nstring1+l)=part(j,l)
xnew(j,nstring1+l)=part(j+5,l)
enddo
pnew(3,nstring1+l)=-pnew(3,nstring1+l)
xnew(3,nstring1+l)=-xnew(3,nstring1+l)
call rotbos(0d0,0d0,ba2(1),ba2(2),ba2(3),
, pnew(1,nstring1+l),pnew(2,nstring1+l),pnew(3,nstring1+l),
, pnew(4,nstring1+l))
call rotbos(0d0,0d0,ba2(1),ba2(2),ba2(3),
, xnew(1,nstring1+l),xnew(2,nstring1+l),xnew(3,nstring1+l),
, xnew(4,nstring1+l))
esum=esum+pnew(4,nstring1+l)
enddo
call leadhad(nstring1+1,nstring1+nstring2,1)
c error check
ctp060926 if(ibar.ne.jbar)then
ctp060926 write(6,*)' *** (E) no baryon number conservation', ibar,jbar
ctp060926 write(6,*)' ',i1,i2,ms1,ms2
ctp060926 write(6,'(5i4)')(itypnew(l),l=1,nstring1+nstring2)
ctp060926 end if
return
ctp060202 718 format(i2,i4,i3,1x,10(f10.4,1x))
17 continue
iz3=iz1
iz4=iz2
i3=i1
i4=i2
m3=m1
m4=m2
c the following lines MUST be there in order to set nucleons on-shell
c after their first collision
if(m3.lt.mminit(i3))m3=mminit(i3)
if(m4.lt.mminit(i4))m4=mminit(i4)
goto 2001
20 continue
c...decays
if(ityptd(1,pslot(1)).eq.0) then
c normal decay
c note: m4,i4 and iz4 are dummies in this call
call anndec(1,m1,i1,iz1,m4,i4,iz4,e,sig,gam)
else
c forward time-delay
pnew(5,1)=fmasstd(1,pslot(1))
itypnew(1)=ityptd(1,pslot(1))
i3new(1)=iso3td(1,pslot(1))
pnew(5,2)=fmasstd(2,pslot(1))
itypnew(2)=ityptd(2,pslot(1))
i3new(2)=iso3td(2,pslot(1))
endif
if(nexit.eq.2) then
i3=itypnew(1)
iz3=i3new(1)
m3=pnew(5,1)
i4=itypnew(2)
iz4=i3new(2)
m4=pnew(5,2)
goto 2001
else
c three or four body decay
nstring1=1
nstring2=nexit-1
do i=1,4
do j=1,nexit
pnew(i,j)=0d0
xnew(i,j)=0d0
end do
end do
mstring(1)=pnew(5,1)
c
mstring(2)=pnew(5,2)
do 91 j=3,nexit
mstring(2)=mstring(2)+pnew(5,j)
91 continue
c
c now call routine for momentum phase space...
call nbodydec(e)
return
endif
23 continue
c...annihilation -> string
if(CTOption(12).ne.0)then
write(6,*)' *** error(make22): string section is called ',
. 'while strings are switched off:CTOption(12).ne.0'
stop
end if
ms1=e/2.
ms2=e/2.
mstring(1)=ms1
mstring(2)=ms2
c determine flavour content of b-bbar-system
call ityp2id(i1,iz1,ifdiq1,ifqrk1)
call ityp2id(i2,iz2,ifdiq2,ifqrk2)
c...create string 1 out of quark-antiquark pair
call qstring(ifqrk1,ifqrk2,ms1,part,ident,nstring1)
esum=0d0
do k=1,nstring1
l=k
do j=1,4
pnew(j,l)=part(j,l)
xnew(j,l)=part(j+5,l)
enddo
esum=esum+pnew(4,l)
pnew(5,l)=part(5,l)
itypnew(l)=ident(1,l)
i3new(l)=ident(2,l)
tau=part(9,l)/ (part(4,l)/part(5,l))
enddo
call leadhad(1,nstring1,0)
c...create string 2 out of diquark-antidiquark-pair
c use one quark and one antiquark for the string-ends:
ifqrk1=int(ifdiq1/1000)
ifqrk2=int(ifdiq2/1000)
c...store remaining flavour quantum numbers in ctp(26), they will
c be passed to the 'clustr'-routine:
ifdiq1=mod(ifdiq1/100,10)
ifdiq2=mod(ifdiq2/100,10)
valint(1)=dble(((abs(ifdiq1*10.d0)+abs(ifdiq2*1.d0))
& *isign(1,ifdiq1)))
valint(1)=sign(valint(1),dble(ifdiq1))
call qstring(ifqrk1,ifqrk2,ms2,part,ident,nstring2)
valint(1)=0.d0
esum=0d0
do l=1,nstring2
do j=1,4
pnew(j,nstring1+l)=part(j,l)
xnew(j,nstring1+l)=part(j+5,l)
enddo
esum=esum+pnew(4,nstring1+l)
pnew(5,nstring1+l)=part(5,l)
itypnew(nstring1+l)=ident(1,l)
i3new(nstring1+l)=ident(2,l)
tau=part(9,nstring1+l)/ (part(4,l)/part(5,l))
enddo
call leadhad(nstring1+1,nstring1+nstring2,0)
return
26 continue
c...elastic MB scattering (the outgoing particle id's must not be
c assigned randomly like at label 2001)
c
if(switips)then
call swpizm(i1,iz1,m1,i2,iz2,m2)
switips=.false.
endif
call setizm(i1,iz1,m1,i2,iz2,m2,i3,iz3,m3,i4,iz4,m4)
if(mminit(i4)+mminit(i3).gt.e)then
ctp060926 write(6,*)'make22(el):threshold violated'
ctp060926 write(6,*)'m3:',m3,mminit(i3)
ctp060926 write(6,*)'m4:',m4,mminit(i4)
else
if(m3.lt.mminit(i3))m3=mminit(i3)
if(m4.lt.mminit(i4))m4=mminit(i4)
end if
c... get momenta & fill newpart, 2 particle exit-channel
nstring1=1
nstring2=1
nexit=2
do i=1,4
do j=1,2
pnew(i,j)=0d0
xnew(i,j)=0d0
end do
end do
c...boost to 2-particle cms
pnew(3,1)=pcms(e,m3,m4)
pnew(3,2)=-pcms(e,m3,m4)
pnew(4,1)=sqrt(m3**2+pnew(3,1)**2)
pnew(4,2)=sqrt(m4**2+pnew(3,2)**2)
pnew(5,1)=m3
mstring(1)=m3
itypnew(1)=i3
i3new(1)=iz3
pnew(5,2)=m4
mstring(2)=m4
itypnew(2)=i4
i3new(2)=iz4
return
27 continue
c XX-> 1 string : e+e- , MB
if(CTOption(12).ne.0)then
write(6,*)' *** error(make22): string section is called ',
. 'while strings are switched off:CTOption(12).ne.0'
stop
end if
c quark-quark scattering -> only elastic !
if(xfac1.lt..999d0.and.xfac2.lt..999d0
& .and.ranf(0).lt.0.25) goto 26
ms1=e
mstring(1)=ms1
mstring(2)=0d0
c determine flavour content of string
if(CTOption(20).eq.1)then
c..e+e- annihilation
if(ranf(0).lt.CTParam(6))then
ifqrk1=3 ! ssbar
ifqrk2=-3
else
call ityp2id(104,0,ifqrk1,ifqrk2) ! qqbar
end if
else
c...MB annihilation. the quark content must be known:
call ityp2id(i2,iz2,iq1(1),iq1(2))
call ityp2id(i1,iz1,ifdiq2,iq2(3))
if(abs(i1).ge.minmes) then
iq2(1)=ifdiq2
iq2(2)=iq2(3)
iq2(3)=0
else
iq2(1)=mod(ifdiq2/100,10)
iq2(2)=int(ifdiq2/1000)
endif
do 312 kq1=1,2
do 412 kq2=1,3
c..two of the quarks must be able to annihilate:
if(iq1(kq1)+iq2(kq2).eq.0) then
kqq1=kq1
kqq2=kq2
goto 414
endif
412 continue
312 continue
goto 26 ! could not create double charged strange baryon string
414 continue
c.. the 'iff'-quarks constitute the produced (anti-)baron
iff(1)=iq1(3-kqq1)
iii=1
do 512 kq2=1,3
if (kq2.ne.kqq2) then
iii=iii+1
iff(iii)=iq2(kq2)
endif
512 continue
if(abs(i1).lt.minmes) then
call mquarks(iff,ifqrk1,ifqrk2)
else
ifqrk1=iff(1)
ifqrk2=iff(2)
endif
endif
c...create string 1 out of quark-antiquark pair
call qstring(ifqrk1,ifqrk2,ms1,part,ident,nstring1)
esum=0d0
c primitive bug-fix:
if(nstring1.eq.0)then
ctp060926 write(6,*)'make22: iline 27 not completed. ->elastic'
goto 26
endif
do 101 k=1,nstring1
l=k
c no leading hadron in e+e-
if(CTOption(20).eq.1)then
leadfac(l)=0.0d0
endif
do 102 j=1,4
pnew(j,l)=part(j,l)
xnew(j,l)=part(j+5,l)
102 continue
esum=esum+pnew(4,l)
pnew(5,l)=part(5,l)
itypnew(l)=ident(1,l)
i3new(l)=ident(2,l)
tau=part(9,l)/ (part(4,l)/part(5,l))
101 continue
if(CTOption(20).eq.1)then
call leadhad(1,nstring1,3)
else
call leadhad(1,nstring1,1)
endif
nstring2=0
return
29 continue
c...DD->ND detailed balance
i3=minnuc
i4=mindel
m3=massit(i3)
m4=getmass(e-m3,0)
if(iabs(iz1+iz2).gt.isoit(i3)+isoit(i4))then
iz3=-9
iz4=-9
else
nexit=2
itot(1)=isoit(i3)
itot(2)=isoit(i4)
call isocgk4(isoit(i1),iz1,isoit(i2),iz2,itot,i3new,errflg)
i3=isign(i3,ii1)
i4=isign(i4,ii2)
iz3=i3new(1)
iz4=i3new(2)
end if
if(ranf(0).gt.0.5d0)call swpizm(i3,iz3,m3,i4,iz4,m4)
goto 2001
100 continue
c...??->NN detailed balance inverse channels
c iso3 are assigned in detbal
nexit=2
i3=minnuc
i4=minnuc
m3=massit(minnuc)
m4=massit(minnuc)
itot(1)=isoit(i3)
itot(2)=isoit(i4)
call isocgk4(isoit(i1),iz1,isoit(i2),iz2,itot,i3new,errflg)
i3=isign(i3,ii1)
i4=isign(i4,ii2)
iz3=i3new(1)
iz4=i3new(2)
if(ranf(0).gt.0.5d0)call swpizm(i3,iz3,m3,i4,iz4,m4)
goto 2001
36 continue
c...MB->B',MM->M* annihilations (forward time delay)
call anndec(0,m1,i1,iz1,m2,i2,iz2,e,sig,gam)
goto 2003
1008 continue
c...get isospin-3 components
nexit=2
itot(1)=isoit(i3)
itot(2)=isoit(i4)
call isocgk4(isoit(i1),iz1,isoit(i2),iz2,itot,i3new,errflg)
iz3=i3new(1)
iz4=i3new(2)
ctp060926 if(errflg.ne.0)then
ctp060926 write(6,*)'make22: iso-spin conservation ',
ctp060926 , 'not possible in isocgk: error-flag=',errflg
ctp060926 write(6,*)' ',isoit(i1),iz1,isoit(i2),iz2,'>',
ctp060926 , isoit(i3),isoit(i4),iz3,iz4,
ctp060926 , ' process:',e,i1,m1,i2,m2,'>',i3,m3,i4,m4,'io=',io
ctp060926 end if
i3=isign(i3,ii1)
i4=isign(i4,ii2)
2001 continue
c... get momenta & fill newpart, 2 particle exit-channel
nstring1=1
nstring2=1
nexit=2
do i=1,4
do j=1,2
pnew(i,j)=0d0
xnew(i,j)=0d0
end do
end do
c...boost to 2-particle cms
if(.not.(ityptd(1,pslot(1)).ne.0.and.CTOption(34).eq.2.and.
& iline.eq.20)) then
c normal decay
pnew(3,1)=pcms(e,m3,m4)
pnew(3,2)=-pcms(e,m3,m4)
pnew(4,1)=sqrt(m3**2+pnew(3,1)**2)
pnew(4,2)=sqrt(m4**2+pnew(3,2)**2)
else
c forward time delay
pnew(1,1)=pxtd(1,pslot(1))
pnew(1,2)=pxtd(2,pslot(1))
pnew(2,1)=pytd(1,pslot(1))
pnew(2,2)=pytd(2,pslot(1))
pnew(3,1)=pztd(1,pslot(1))
pnew(3,2)=pztd(2,pslot(1))
pnew(4,1)=p0td(1,pslot(1))
pnew(4,2)=p0td(2,pslot(1))
endif
pnew(5,1)=m3
mstring(1)=m3
itypnew(1)=i3
i3new(1)=iz3
pnew(5,2)=m4
mstring(2)=m4