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|
c---------------------------------------------------------------------
subroutine timann
c---------------------------------------------------------------------
c electron-positron
c---------------------------------------------------------------------
include 'epos.inc'
include 'epos.incsem'
common/nfla/nfla
parameter (ntim=1000)
common/cprt/pprt(5,ntim),q2prt(ntim),idaprt(2,ntim),idprt(ntim)
&,iorprt(ntim),jorprt(ntim),nprtj
integer jcp(6,2),jcm(6,2)
dimension p1(5),jorprt2(ntim),ng(ntim)
call utpri('timann',ish,ishini,5)
egyevt=engy
qsqevt=engy**2
123 nprtj=1
en=engy
q20=0.
nptl=0
nptl=nptl+1 !electron
pptl(1,nptl)=0.
pptl(2,nptl)=0.
pptl(3,nptl)=sqrt(en**2/4-2.61121e-7)
pptl(4,nptl)=en/2.
pptl(5,nptl)=0.000511
idptl(nptl)=12
istptl(nptl)=1
nptl=nptl+1 !positron
pptl(1,nptl)=0.
pptl(2,nptl)=0.
pptl(3,nptl)=-sqrt(en**2/4-2.61121e-7)
pptl(4,nptl)=en/2.
pptl(5,nptl)=0.000511
idptl(nptl)=-12
istptl(nptl)=1
nptl=nptl+1 !virtual gamma
pptl(1,nptl)=0.
pptl(2,nptl)=0.
pptl(3,nptl)=0.
pptl(4,nptl)=en
pptl(5,nptl)=en
idptl(nptl)=10
iorptl(nptl)=nptl-2
jorptl(nptl)=nptl-1
istptl(nptl)=1
pprt(1,nprtj)=0.
pprt(2,nprtj)=0.
pprt(3,nprtj)=0.
pprt(4,nprtj)=en
pprt(5,nprtj)=en
idaprt(1,nprtj)=2
idaprt(2,nprtj)=3
if(q20.gt.0.)then
pprt(5,nprtj)=sqrt(q20)
else
pprt(5,nprtj)=en
endif
nfla=0
do i=1,naflav
call idmass(i,am)
if (2.*am.lt.en) nfla=i
enddo
if(itflav.eq.0)then
s=engy**2
dlz=2.4
amz=91.1885
al=1./real(137.035989d0)
gf=1.16639e-5
ak=sqrt(2.)*gf*amz**2/(16*pi*al)
chi1=ak*s*(s-amz**2)/((s-amz**2)**2+dlz**2*amz**2)
chi2=ak**2*s**2/((s-amz**2)**2+dlz**2*amz**2)
qe=-1.
ve=0.25-2.*qe*0.232
ae=-0.5
qf=2./3.
vf=sign(.5,qf)-2.*qf*0.232
af=sign(.5,qf)
dsmax1=
$ 2.*(qf**2-2.*qf*ve*vf*chi1
$ +(ae**2+ve**2)*(af**2+vf**2)*chi2)
$ + abs(-4*qf*ae*af*chi1+8*ae*ve*af*vf*chi2)
qf=-1./3.
vf=sign(.5,qf)-2.*qf*0.232
af=sign(.5,qf)
dsmax2=
$ 2.*(qf**2-2.*qf*ve*vf*chi1
$ +(ae**2+ve**2)*(af**2+vf**2)*chi2)
$ + abs(-4*qf*ae*af*chi1+8*ae*ve*af*vf*chi2)
100 iq1=1+INT(nfla*rangen())
call idchrg(iq1,qf)
ct=-1.+2.*rangen()
vf=sign(.5,qf)-2.*qf*0.232
af=sign(.5,qf)
dsigma=
$ (1.+ct**2)*(qf**2-2.*qf*ve*vf*chi1
$ +(ae**2+ve**2)*(af**2+vf**2)*chi2)
$ + ct*(-4*qf*ae*af*chi1+8*ae*ve*af*vf*chi2)
if(rangen().gt.dsigma/max(dsmax1,dsmax2)) goto 100
else
iq1=itflav
endif
if(rangen().lt.0.5)iq1=-iq1
nprtj=nprtj+1
idprt(nprtj)=iq1
pprt(4,nprtj)=en/2.
pprt(5,nprtj)=en
iorprt(nprtj)=1
jorprt(nprtj)=iq1
q2prt(nprtj)=en**2
nprtj=nprtj+1
idprt(nprtj)=-iq1
pprt(4,nprtj)=en/2.
pprt(5,nprtj)=en
iorprt(nprtj)=1
jorprt(nprtj)=-iq1
q2prt(nprtj)=en**2
call timsho(2,3)
jorprt2(1)=0 !!color-connection, no origin!!
jt=1
if(idprt(idaprt(1,1)).lt.0)jt=2
do i=1,nprtj
ng(i)=0
if(idaprt(1,i).ne.0) then
js=jt
if(idprt(i).lt.0.and.
& ((idprt(idaprt(2,i)).eq.9.and.jt.eq.1).or.
& (idprt(idaprt(1,i)).eq.9.and.jt.eq.2)))then
js=3-jt
elseif(idprt(i).gt.0.and.idprt(i).ne.9.and.
& ((idprt(idaprt(2,i)).eq.9.and.jt.eq.2).or.
& (idprt(idaprt(1,i)).eq.9.and.jt.eq.1)))then
js=3-jt
elseif(idprt(i).eq.9.and.idprt(idaprt(1,i)).ne.9.and.
& ((idprt(idaprt(1,i)).lt.0.and.jt.eq.2).or.
& (idprt(idaprt(1,i)).gt.0.and.jt.eq.1)))then
js=3-jt
endif
jorprt2(idaprt(3-js,i))=jorprt2(i)
jorprt2(i)=idaprt(js,i)
jorprt2(idaprt(js,i))=idaprt(3-js,i)
else
j=i
do while(iorprt(j).ne.0)
ng(i)=ng(i)+1
j=iorprt(j)
enddo
endif
enddo
if(ish.ge.5)then
i=1
do while(i.ne.0)
if(idaprt(1,i) .eq. 0 ) then
write(ifch,*) idprt(i)
write(ifch,*) '|'
endif
i=jorprt2(i)
enddo
endif
iptl=nptl
i=1
do while(i.gt.0)
if(idaprt(1,i) .eq. 0) then
nptl=nptl+1
do j=1,5
pptl(j,nptl)=pprt(j,i)
enddo
idptl(nptl)=idprt(i)
istptl(nptl)=20
ityptl(nptl)=30
iorptl(nptl)=iptl
jorptl(nptl)=jorprt(i) !type of mother parton
qsqptl(nptl)=q2prt(i)
endif
i=jorprt2(i)
enddo
ifrptl(1,iptl)=iptl+1
ifrptl(2,iptl)=nptl
nk1=iptl+1
441 nk2=nk1+1
do while (idptl(nk2).eq.9)
nk2=nk2+1
enddo
do i=1,4
p1(i)=0.
do j=nk1,nk2
p1(i)=p1(i)+pptl(i,j)
enddo
enddo
p1(5)=sqrt(max(0.,p1(4)**2-p1(3)**2-p1(2)**2-p1(1)**2))
do i=1,2
do j=1,6
jcm(j,i)=0
jcp(j,i)=0
enddo
enddo
ii=1
if(idptl(nk1).lt.0)ii=2
jcp(abs(idptl(nk1)),ii)=1
jcm(abs(idptl(nk2)),3-ii)=1
amm= utamnx(jcp,jcm)
if(amm.gt.p1(5))goto 123
nk1=nk2+1
if(nk1.lt.nptl)goto 441
if(ish.ge.5)then
write(ifch,*)
do i=1,nprtj
write(ifch,98) i,(pprt(j,i),j=1,5),idprt(i)
& ,iorprt(i),idaprt(1,i),idaprt(2,i),jorprt2(i),ng(i)
enddo
write(ifch,*)
do i=1,nprtj
if(pprt(5,i).eq.0.)
& write(ifch,99) i,(pprt(j,i),j=1,5),idprt(i),ng(i)
enddo
write(ifch,*)
write(ifch,*)
endif
99 format(i4,5g10.3,2i4)
98 format(i4,5g10.3,6i4)
call utprix('timann',ish,ishini,5)
return
end
c---------------------------------------------------------------------
subroutine timsh1(q20,en,idfla,jo)
c---------------------------------------------------------------------
include 'epos.inc'
include 'epos.incsem'
common/nfla/nfla
parameter (ntim=1000)
common/cprt/pprt(5,ntim),q2prt(ntim),idaprt(2,ntim),idprt(ntim)
&,iorprt(ntim),jorprt(ntim),nprtj
common/cprtx/nprtjx,pprtx(5,2)
nfla=naflav
nprtj=1
pprt(1,nprtj)=0.
pprt(2,nprtj)=0.
pprt(3,nprtj)=0.
pprt(4,nprtj)=en
pprt(5,nprtj)=sqrt(q20)
q2prt(nprtj)=q20
idprt(nprtj)=idfla
iorprt(nprtj)=nprtj
jorprt(nprtj)=jo
call timsho(1,0)
nprtjx=0
return
end
c---------------------------------------------------------------------
subroutine timsh2(q20,q21,en,idfla1,idfla2,jo1,jo2)
c---------------------------------------------------------------------
include 'epos.inc'
include 'epos.incsem'
common/nfla/nfla
parameter (ntim=1000)
common/cprt/pprt(5,ntim),q2prt(ntim),idaprt(2,ntim),idprt(ntim)
&,iorprt(ntim),jorprt(ntim),nprtj
common/cprtx/nprtjx,pprtx(5,2)
nfla=naflav
nprtj=1
pprt(1,nprtj)=0.
pprt(2,nprtj)=0.
pprt(3,nprtj)=0.
pprt(4,nprtj)=en/2.
pprt(5,nprtj)=sqrt(q20)
q2prt(nprtj)=q20
idprt(nprtj)=idfla1
iorprt(nprtj)=nprtj
jorprt(nprtj)=jo1
nprtj=2
pprt(1,nprtj)=0.
pprt(2,nprtj)=0.
pprt(3,nprtj)=0.
pprt(4,nprtj)=en/2.
pprt(5,nprtj)=sqrt(q21)
q2prt(nprtj)=q21
idprt(nprtj)=idfla2
iorprt(nprtj)=nprtj
jorprt(nprtj)=jo2
call timsho(1,2)
nprtjx=1
pprtx(1,nprtjx)=0.
pprtx(2,nprtjx)=0.
pprtx(3,nprtjx)=en/2.
pprtx(4,nprtjx)=en/2.
pprtx(5,nprtjx)=0
nprtjx=2
pprtx(1,nprtjx)=0.
pprtx(2,nprtjx)=0.
pprtx(3,nprtjx)=-en/2.
pprtx(4,nprtjx)=en/2.
pprtx(5,nprtjx)=0
return
end
c---------------------------------------------------------------------
subroutine timsho(j1,j2)
c---------------------------------------------------------------------
include 'epos.inc'
include 'epos.incsem'
parameter (ntim=1000)
common/cprt/pprt(5,ntim),q2prt(ntim),idaprt(2,ntim),idprt(ntim)
&,iorprt(ntim),jorprt(ntim),nprtj
dimension pz(ntim),id(2,ntim)
dimension ij(2),jo(2,2),ee(2),amm2(-6:10),q2s(2)
logical first
common/nfla/nfla
call utpri('timsho',ish,ishini,5)
if(iappl.eq.6)then
do i=1,6
call idmass(i,am)
amm2(i)=am**2
amm2(-i)=am**2
enddo
else
do i=1,6
amm2(i)=0.
amm2(-i)=0.
enddo
endif
amm2(9)=0.
amm2(0)=0.
amm2(10)=0.
nn=nprtj
ij(1)=j1
ij(2)=j2
ii2=2
if(j2.eq.0)ii2=1
ii=1
first=.true.
n10=0
10 n10=n10+1
if(float(n10).gt.1e7)then
goto9999
endif
io=iorprt(ij(ii))
idfl=idprt(ij(ii))
q2start=pprt(5,ij(ii))**2
E=pprt(4,ij(ii))
if(ij(2).eq.j2.and.ii2.eq.2)E=pprt(4,ij(1))+pprt(4,ij(2))
zetamx=0.
if(ij(1).ne.j1)then
zetamx=pprt(5,io)/pprt(4,io)/sqrt(pz(io)*(1.-pz(io)))
endif
c call timdev(idfl,q2start,E,zetamx,idfla,idflb,qa2,z)
c......................................................................
q2=q2start
z=0.5
PT2MIN=max(qcdlam*1.1,q2fin)
ALFM=LOG(PT2MIN/qcdlam)
if(ish.ge.9)then
write (ifch,*) '---------------------',ii
$ ,pprt(5,ij(1)) !,pprt(5,ij(2))
write(ifch,*) ' idfl,q2start,zetamx:',idfl,q2start,zetamx
endif
if (q2.lt.4.*q2fin+2.*amm2(idfl) )then
if(ish.ge.9)then
write(ifch,'(a,f3.0)') 'null:',0.
endif
q2=amm2(idfl)
idfla=0
idflb=0
goto 999
endif
390 zc=.5*(1.-sqrt(max(0.000001,1.-4.*q2fin/q2)))
if(ish.ge.9)then
write(ifch,*) 'zc=',zc
endif
IF(idfl.EQ.9) THEN
FBRqqb=nfla*(0.5-ZC)
FBR=6.*LOG((1.-ZC)/ZC)+FBRqqb
ELSE
FBRqqb=0.
FBR=(8./3.)*LOG((1.-ZC)/ZC)
endif
B0=(33.-2.*nfla)/6.
c.....select new q2
r=rangen()
q2=q2*exp(log(r)*B0*ALFM/FBR)
if(ish.ge.9)then
write(ifch,*) 'q^2=',q2
endif
if (q2.lt.4.*q2fin+2.*amm2(idfl))then
q2=amm2(idfl)
if(ish.ge.9)then
write(ifch,'(a,f3.0)') 'null:',0.
endif
idfla=0
idflb=0
goto 999
endif
c.....select flavor and z-value .....................................
IF(idfl.EQ.9) THEN
if(rangen()*FBR.lt.FBRqqb)then
! .................g -> qqbar
Z=ZC+(1.-2.*ZC)*rangen()
IF(Z**2+(1.-Z)**2.LT.rangen()) GOTO 390
idfla=int(1.+rangen()*real(nfla))
idflb=-idfla
else !..................g -> gg
Z=(1.-ZC)*(ZC/(1.-ZC))**rangen()
IF(rangen().GT.0.5) Z=1.-Z
IF((1.-Z*(1.-Z))**2.lt.rangen()) GOTO 390
idfla=9
idflb=9
endif
ELSE
Z=1.-(1.-ZC)*(ZC/(1.-ZC))**rangen() !!........q -> qg
IF(1.+Z**2.LT.2.*rangen()) GOTO 390
idfla=idfl
idflb=9
endif
if(q2*z*(1.-z).le.qcdlam) goto 390
if(alfm.lt.rangen()*log(q2*z*(1.-z)/qcdlam)) goto 390
if(ij(1).ne.j1.or.ij(2).eq.0)then
if(E.le.sqrt(q2))goto 390
pzz=sqrt((E-sqrt(q2))*(E+sqrt(q2)))
pt2=(E**2*(z*(1.-z)*q2-z*amm2(idflb)-(1.-z)*amm2(idfla))
$ -.25*(amm2(idflb)-amm2(idfla)-q2)**2+q2*amm2(idfla))/pzz**2
if (pt2.le.0.) then
if(ish.ge.9)then
write(ifch,*) 'z not good for pt2:',z,pt2
endif
goto 390
endif
endif
zeta = sqrt(q2)/E/sqrt(z*(1.-z))
if(zetamx.gt.0)then
if (zeta.gt.zetamx)then
if(ish.ge.9)then
write(ifch,*) zeta,' > ',zetamx,'zeta-Ablehnung'
endif
goto 390
endif
endif
999 continue
c......................................................................
if(zeta.gt.zetacut)then
q2s(ii)=q2
if(idfla.eq.9)then !anything -> gluon jet
jo(1,ii)=-9
elseif(jorprt(ij(ii)).eq.-9)then !gluon -> quark jet
jo(1,ii)=idfla
else !no change
jo(1,ii)=jorprt(ij(ii))
endif
if(idflb.eq.9)then !anything -> gluon jet
jo(2,ii)=-9
elseif(jorprt(ij(ii)).eq.-9)then !gluon -> quark jet
jo(2,ii)=idflb
else
jo(2,ii)=jorprt(ij(ii))
endif
else !no change
jo(1,ii)=jorprt(ij(ii))
jo(2,ii)=jorprt(ij(ii))
q2s(ii)=q2prt(ij(ii))
endif
pprt(5,ij(ii))=sqrt(q2)
id(1,ii)=idfla
id(2,ii)=idflb
pz(ij(ii))=z
if(first)then
ii=2
first=.false.
if(ii2.eq.2)goto 10
endif
if(ij(2).eq.0)then
z1=1.
z2=0.
pt=0.
alpha=0.
pprt(3,ij(1))=sqrt(E**2-pprt(5,ij(1))**2)
elseif(ij(1).eq.j1.and.ij(2).eq.j2)then
E=pprt(4,ij(1))+pprt(4,ij(2))
ee(1)=E*.5+(pprt(5,ij(1))**2-pprt(5,ij(2))**2)/2./E
ee(2)=E-ee(1)
ii=1
do while (ii.le.2)
if(ee(ii)-pprt(5,ij(ii)).lt.0.) then
if(ish.ge.5)then
write(ifch,*) 'goto 11'
endif
ii=1
if ( pprt(5,ij(1))**2-amm2(idprt(ij(1))).lt.
$ pprt(5,ij(2))**2-amm2(idprt(ij(2))) ) ii=2
goto 10
endif
c zc=.5*(1.-sqrt(1.-pprt(5,ij(ii))**2/ee(ii)**2))
c if(pz(ij(ii)).lt.zc.or.pz(ij(ii)).gt.1.-zc)then
c if(ish.ge.7)then
c write(ifch,*) 'first branching rejected'
c endif
c goto 10
c endif
z=pz(ij(ii))
q2=pprt(5,ij(ii))**2
pzz=sqrt((ee(ii)-pprt(5,ij(ii)))*(ee(ii)+pprt(5,ij(ii))))
if(pzz.gt.0.)then
pt2=(ee(ii)**2*(z*(1.-z)*q2-z*amm2(id(2,ii))
$ -(1.-z)*amm2(id(1,ii)))
$ -.25*(amm2(id(2,ii))-amm2(id(1,ii))-q2)**2
$ +q2*amm2(id(1,ii)))/pzz**2
else
pt2=0.
endif
if(id(1,ii).ne.0.and.pt2.le.0.)then
if(ish.ge.7)then
write(ifch,*) 'first branching rejected for pt2',ii
$ ,z1,q2,ee(ii),pprt(5,ij(ii)),id(1,ii),id(2,ii)
endif
goto 10
endif
ii=ii+1
enddo
z1=ee(1)/E
z2=ee(2)/E
if(ish.ge.7)then
write(ifch,*) 'z of first branching',z1
endif
pprt(3,ij(1))= sqrt(max(0.,ee(1)**2-pprt(5,ij(1))**2))
pprt(3,ij(2))=-sqrt(max(0.,ee(2)**2-pprt(5,ij(2))**2))
pt=0.
alpha=0.
else
E=pprt(4,io)
z1=pz(io)
z2=1.-z1
am0=pprt(5,io)
am1=pprt(5,ij(1))
am2=pprt(5,ij(2))
aM=am2**2-am0**2-am1**2
pzz=sqrt((E-am0)*(E+am0))
pprt(3,ij(1))=.5*(aM+2.*z1*E**2)/pzz
pprt(3,ij(2))=pzz-pprt(3,ij(1))
pt2=(E**2*(z1*z2*am0**2-z1*am2**2-z2*am1**2)
$ -.25*aM**2+am0**2*am1**2)/pzz**2
if(ish.ge.8)then
write(ifch,*) 'pt2,pzz=',pt2,pzz,z1**2*E*pprt(5,io),z1,E
$ ,pprt(5,io)
endif
if(pt2.lt.0.) then
ii=1
if ( pprt(5,ij(1))**2-amm2(idprt(ij(1))).lt.
$ pprt(5,ij(2))**2-amm2(idprt(ij(2))) ) ii=2
goto 10
endif
pt=sqrt(pt2)
alpha=2.*pi*rangen()
endif
pprt(4,ij(1))=z1*E
pprt(1,ij(1))=cos(alpha)*pt
pprt(2,ij(1))=sin(alpha)*pt
if(ii2.eq.2)then
pprt(4,ij(2))=z2*E
pprt(1,ij(2))=-cos(alpha)*pt
pprt(2,ij(2))=-sin(alpha)*pt
endif
if(ij(1).ne.j1)then
if(pprt(1,io).ne.0..or.pprt(2,io).ne.0.)then
do ii=1,2
call utrota(-1,pprt(1,io),pprt(2,io),pprt(3,io)
& ,pprt(1,ij(ii)),pprt(2,ij(ii)),pprt(3,ij(ii)))
enddo
endif
endif
if(ij(1).ne.j1)then
if(pprt(3,io).lt.0.)then
do k=1,3
do ii=1,2
pprt(k,ij(ii)) = -pprt(k,ij(ii))
enddo
enddo
endif
endif
do ii=1,ii2
if(id(1,ii).ne.0)then
idprt(nprtj+1)=id(1,ii)
idprt(nprtj+2)=id(2,ii)
pprt(4,nprtj+1)=pz(ij(ii))*pprt(4,ij(ii))
pprt(5,nprtj+1)=pz(ij(ii))*pprt(5,ij(ii))
pprt(4,nprtj+2)=(1.-pz(ij(ii)))*pprt(4,ij(ii))
pprt(5,nprtj+2)=(1.-pz(ij(ii)))*pprt(5,ij(ii))
q2prt(nprtj+1)=q2s(ii)
q2prt(nprtj+2)=q2s(ii)
iorprt(nprtj+1)=ij(ii)
iorprt(nprtj+2)=ij(ii)
jorprt(nprtj+1)=jo(1,ii)
jorprt(nprtj+2)=jo(2,ii)
idaprt(1,ij(ii))=nprtj+1
idaprt(2,ij(ii))=nprtj+2
idaprt(1,nprtj+1)=0
idaprt(2,nprtj+1)=0
idaprt(1,nprtj+2)=0
idaprt(2,nprtj+2)=0
nprtj=nprtj+2
else
idaprt(1,ij(ii))=0
idaprt(2,ij(ii))=0
endif
enddo
if(ish.ge.5)then
if(ij(1).ne.j1)then
write(ifch,98) io,(pprt(j,io),j=1,5),pz(io),jorprt(io)
& ,idprt(io)
write(ifch,*) '->'
endif
write(ifch,99) ij(1),(pprt(j,ij(1)),j=1,5),pz(ij(1))
& ,jo(1,1),jo(2,1),idprt(ij(1)),'->',id(1,1),id(2,1)
if(ij(2).ne.0)write(ifch,99) ij(2),
& (pprt(j,ij(2)),j=1,5),pz(ij(2))
& ,jo(1,2),jo(2,2),idprt(ij(2)),'->',id(1,2),id(2,2)
write(ifch,*)
endif
98 format(i4,6g10.3,3i3)
99 format(i4,6g10.3,3i3,a,2i4)
if(ij(1).le.nn)ij(1)=nn-1
ij(1)=ij(1)+2
ij(2)=ij(1)+1
ii=1
ii2=2
first=.true.
if(ij(1).le.nprtj)goto 10
if(ish.ge.5)then
write(ifch,*)
do i=1,nprtj
write(ifch,'(i4,1x,5g10.4,2i4,a,2i4)')
& i,(pprt(j,i),j=1,5),idprt(i)
& ,iorprt(i),' -->',idaprt(1,i),idaprt(2,i)
enddo
write(ifch,*)
endif
9999 call utprix('timsho',ish,ishini,5)
return
end
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