| 9ef1c2d9 |
1 | c reshuffled from sem, sto, sha |
| 2 | |
| 3 | c contains psahot and related stuff |
| 4 | c ------ |
| 5 | |
| 6 | |
| 7 | |
| 8 | c----------------------------------------------------------------------- |
| 9 | subroutine psahot(kcol,ncolp,iret) |
| 10 | c----------------------------------------------------------------------- |
| 11 | c psahot - showering (semihard parton-parton interaction) |
| 12 | c----------------------------------------------------------------------- |
| 13 | include 'epos.inc' |
| 14 | include 'epos.incsem' |
| 15 | include 'epos.incems' |
| 16 | double precision ept(4),ept1(4),xx,wpt(2),eprt,pl,plprt,wplc |
| 17 | *,wp0,wm0,s,si,smin,xmin,xp1,wpi,wmi,xp,xm,wp1,wm1,wp2,wm2 |
| 18 | *,wpq,wmq,wpi1,wmi1,pxh,pyh,pth,xmm,xp2,xg,zg,smax,xmax |
| 19 | *,xmax1,xmin1,zp0,psutz,xpmax0,xpmin0,gb0,tmax0,tmin0,zpm,gb |
| 20 | *,gbyj,tmax,tmin,t,gb7,x,s2,discr,qt,qt2,x1min,x1max,t1min,t1max |
| 21 | *,t1,xq1,qq,qqmax,qqmin,pt2,xmin2,ptnew,xpmin,xpmax,xm0,psuds |
| 22 | c *,xprh,xmrh |
| 23 | dimension ep3(4),ey(3),bx(6) |
| 24 | *,qmin(2),iqc(2),nqc(2),ncc(2,2),amqt(4) |
| 25 | parameter (mjstr=20000) |
| 26 | common /psar7/ delx,alam3p,gam3p |
| 27 | common /psar29/eqj(4,mjstr),iqj(mjstr),ncj(2,mjstr),nj |
| 28 | common /psar30/iorj(mjstr),ityj(mjstr),bxj(6,mjstr) |
| 29 | common /testj/ ajeth(4),ajete(5),ajet0(7) |
| 30 | parameter (ntim=1000) |
| 31 | common/cprt/nprtj,pprt(5,ntim),idprt(ntim),iorprt(ntim) |
| 32 | &,idaprt(2,ntim) |
| 33 | common/emsptl/nppr(npommx,kollmx),npproj(mamx),nptarg(mamx) |
| 34 | integer icp(2),ict(2),icini(2) |
| 35 | integer jcp(nflav,2),jct(nflav,2),nemis(2) |
| 36 | common/cprtx/nprtjx,pprtx(5,2)/ciptl/iptl |
| 37 | |
| 38 | call utpri('psahot',ish,ishini,3) |
| 39 | |
| 40 | iret=0 |
| 41 | alpq=-(alppar+1.)/2. |
| 42 | qqcut=q2min !????????????pt2cut |
| 43 | |
| 44 | |
| 45 | nptl1=nptl |
| 46 | iptl=nppr(ncolp,kcol) |
| 47 | ip=iproj(kcol) |
| 48 | it=itarg(kcol) |
| 49 | do i=1,2 |
| 50 | icp(i)=icproj(i,ip) |
| 51 | ict(i)=ictarg(i,it) |
| 52 | enddo |
| 53 | idpomr=idhpr(ncolp,kcol) |
| 54 | bpomr=bhpr(ncolp,kcol) |
| 55 | |
| 56 | q2finsave=q2fin |
| 57 | zzzz=zzremn(ip,1)+zzremn(it,2) |
| 58 | zz=min( 1+zoemax , 1+zoeinc *zzzz ) !<----- |
| 59 | q2fin=q2fin*zz |
| 60 | |
| 61 | ajeth(idpomr+1)=ajeth(idpomr+1)+1. |
| 62 | c write(*,*)ajeth |
| 63 | idfpomr=idfpr(ncolp,kcol) |
| 64 | if(ish.ge.3)write(ifch,*)'Start psahot (icp,ict):',ip,icp,it,ict |
| 65 | *,ncolp,kcol,iptl,idpomr,idfpomr,bpomr |
| 66 | |
| 67 | |
| 68 | if(idfpomr.eq.0)stop'idfpomr??????' |
| 69 | if(ish.ge.3)then |
| 70 | write(ifch,20)iptl |
| 71 | * ,sqrt(pptl(1,iptl)**2+pptl(2,iptl)**2),pptl(3,iptl) |
| 72 | * ,pptl(4,iptl),pptl(5,iptl) |
| 73 | * ,istptl(iptl),ityptl(iptl) |
| 74 | 20 format(1x,i4,3x,4(e11.5,1x),i2,1x,i3) |
| 75 | endif |
| 76 | istptl(iptl)=31 |
| 77 | |
| 78 | 1 nj=0 |
| 79 | nptl=nptl1 |
| 80 | |
| 81 | wp0=dsqrt(xpr(ncolp,kcol))*dexp(ypr(ncolp,kcol))*dble(engy) !???? new |
| 82 | wm0=dsqrt(xpr(ncolp,kcol))*dexp(-ypr(ncolp,kcol))*dble(engy) !double |
| 83 | |
| 84 | |
| 85 | amqt(1)=sqrt(sngl(xxp1pr(ncolp,kcol)**2+xyp1pr(ncolp,kcol)**2)) |
| 86 | amqt(2)=sqrt(sngl(xxp2pr(ncolp,kcol)**2+xyp2pr(ncolp,kcol)**2)) |
| 87 | amqt(3)=sqrt(sngl(xxm2pr(ncolp,kcol)**2+xym2pr(ncolp,kcol)**2)) |
| 88 | amqt(4)=sqrt(sngl(xxm1pr(ncolp,kcol)**2+xym1pr(ncolp,kcol)**2)) |
| 89 | amqpt=amqt(1)+amqt(2)+amqt(3)+amqt(4) |
| 90 | |
| 91 | s2min=4.*q2min |
| 92 | if(sngl(wp0*wm0).le.(sqrt(s2min)+amqpt)**2)then |
| 93 | if(ish.ge.1)then |
| 94 | call utmsg('psahot: insufficient pomeron mass&') |
| 95 | write (ifch,*)'mass:',dsqrt(wp0*wm0),amqpt+sqrt(s2min) |
| 96 | call utmsgf |
| 97 | endif |
| 98 | iret=1 |
| 99 | goto 16 |
| 100 | endif |
| 101 | |
| 102 | ih=iproj(kcol) |
| 103 | jh=itarg(kcol) |
| 104 | c xprh=xpp(ih) |
| 105 | c xmrh=xmt(jh) |
| 106 | rp=r2had(iclpro)+r2had(icltar)+slopom*log(engy**2) |
| 107 | z=exp(-bpomr**2/(4.*.0389*rp)) |
| 108 | |
| 109 | if(z.eq.0)then |
| 110 | write(ifch,*)'psahot : z,ih,jh ! -> ',z,ih,jh |
| 111 | call gakli2(ih,ih) |
| 112 | call gakli2(jh,jh) |
| 113 | call gakli2(iptl,iptl) |
| 114 | stop |
| 115 | endif |
| 116 | |
| 117 | do l=1,4 |
| 118 | bx(l)=xorptl(l,iptl) |
| 119 | enddo |
| 120 | bx(5)=tivptl(1,iptl) |
| 121 | bx(6)=tivptl(2,iptl) |
| 122 | ity=ityptl(iptl) |
| 123 | |
| 124 | if(idpomr.eq.0)then !gg-pomeron |
| 125 | iqq=0 !type of the hard interaction: 0 - gg, 1 - qg, 2 - gq, 3 - qq |
| 126 | pxh=0.d0 !p_x for sh pomeron |
| 127 | pyh=0.d0 !p_y for sh pomeron |
| 128 | elseif(idpomr.eq.1)then !qg-pomeron |
| 129 | iqq=1 |
| 130 | pxh=xxp1pr(ncolp,kcol) |
| 131 | pyh=xyp1pr(ncolp,kcol) |
| 132 | amqpt=amqpt-amqt(1) |
| 133 | elseif(idpomr.eq.2)then !gq-pomeron |
| 134 | iqq=2 |
| 135 | pxh=xxm2pr(ncolp,kcol) |
| 136 | pyh=xym2pr(ncolp,kcol) |
| 137 | amqpt=amqpt-amqt(3) |
| 138 | elseif(idpomr.eq.3)then !qq-pomeron |
| 139 | iqq=3 |
| 140 | pxh=xxp1pr(ncolp,kcol)+xxm2pr(ncolp,kcol) |
| 141 | pyh=xyp1pr(ncolp,kcol)+xym2pr(ncolp,kcol) |
| 142 | amqpt=amqpt-amqt(1)-amqt(3) |
| 143 | else |
| 144 | stop'unknown pomeron' |
| 145 | endif |
| 146 | pth=pxh**2+pyh**2 |
| 147 | |
| 148 | nj0=nj |
| 149 | if(ish.ge.6)write(ifch,*)'iptl,nptl,wp0,wm0,z,iqq,bx:' |
| 150 | if(ish.ge.6)write(ifch,*) iptl,nptl,wp0,wm0,z,iqq,bx |
| 151 | |
| 152 | s=wp0*wm0 !lc+*lc- for the semihard interaction |
| 153 | smin=dble(s2min)+pth !mass cutoff for the hard pomeron |
| 154 | xmin=smin/s |
| 155 | smax=(dsqrt(s)-dble(amqpt))**2 !max mass for the hard pomeron |
| 156 | xmax=smax/s |
| 157 | if(smax.le.smin)then |
| 158 | write (ifmt,*)'smax,smin',smax,smin |
| 159 | iret=1 |
| 160 | goto 16 |
| 161 | endif |
| 162 | xpmax0=psutz(s,smin,dble(amqpt**2)) !max x+ for the hard pomeron |
| 163 | xpmin0=xmin/xpmax0 !min x+ for the hard pomeron |
| 164 | xp1=wp0/dble(engy) !lc+ share for the semihard interaction |
| 165 | xp2=wm0/dble(engy) !lc- share for the semihard interaction |
| 166 | |
| 167 | |
| 168 | c----------------------------------------------------------------- |
| 169 | c determine LC momenta wpi,wmi for hard Pomeron |
| 170 | c----------------------------------------------------------------- |
| 171 | |
| 172 | if(ish.ge.4)write(ifch,*) |
| 173 | & 'determine LC momenta wpi,wmi for hard Pomeron' |
| 174 | |
| 175 | !------------------------------------------ |
| 176 | if(iqq.eq.3)then ! val-val |
| 177 | !------------------------------------------ |
| 178 | |
| 179 | if(ish.ge.4)write(ifch,*)'val-val' |
| 180 | xmin1=xmin**dble(delh+.4) |
| 181 | xmax1=xmax**dble(delh+.4) |
| 182 | zp0=dsqrt(xmin) |
| 183 | if(zp0.ge.1.d0)call utstop('zp0 in sem&') |
| 184 | !........ kinematical bounds |
| 185 | tmax0=dlog((1.d0+dsqrt(1.d0-zp0))/(1.d0-dsqrt(1.d0-zp0))) |
| 186 | tmin0=dlog((1.d0+dsqrt(1.d0-xpmax0)) |
| 187 | * /(1.d0-dsqrt(1.d0-xpmax0))) |
| 188 | if(iclpro.ne.4)then |
| 189 | call psjti0(sngl(smax-pth),sqq,sqqb,1,1) |
| 190 | call psjti0(sngl(smax-pth),sqqp,sqqpb,1,2) |
| 191 | call psjti0(sngl(smax-pth),sqaq,sqaqb,-1,1) |
| 192 | else |
| 193 | call psjti0(sngl(smax-pth),sqqp,sqqpb,4,2) |
| 194 | sqq=0. |
| 195 | sqaq=0. |
| 196 | endif |
| 197 | uv1=psdfh4(sngl(zp0*xp1),q2min,0.,iclpro,1) |
| 198 | dv1=psdfh4(sngl(zp0*xp1),q2min,0.,iclpro,2) |
| 199 | uv2=psdfh4(sngl(zp0*xp2),q2min,0.,icltar,1) |
| 200 | dv2=psdfh4(sngl(zp0*xp2),q2min,0.,icltar,2) |
| 201 | wwuu=uv1*uv2*sqq |
| 202 | if(iclpro.eq.2)then |
| 203 | wwdd=dv1*dv2*sqq |
| 204 | elseif(iclpro.eq.1)then |
| 205 | wwdd=dv1*dv2*sqaq |
| 206 | elseif(iclpro.eq.3)then |
| 207 | wwdd=dv1*dv2*sqqp |
| 208 | elseif(iclpro.eq.4)then |
| 209 | wwuu=uv1*uv2*sqqp |
| 210 | wwdd=0. |
| 211 | endif |
| 212 | wwud=uv1*dv2*sqqp |
| 213 | wwdu=dv1*uv2*sqqp |
| 214 | wudt=wwuu+wwdd+wwud+wwdu |
| 215 | gb0=dble(wudt)/xmax**dble(delh)/xmin**0.4* |
| 216 | * (1.d0-zp0*xp1)**dble(-1.-alpq-alplea(iclpro))* |
| 217 | * (1.d0-zp0*xp2)**dble(-1.-alpq-alplea(icltar))*(tmax0-tmin0) |
| 218 | * *(1.d0-zp0)**dble(.5+alpq)*(1.d0-zp0)**dble(alpq) *5.d0 |
| 219 | |
| 220 | 3 zpm=(xmin1+dble(rangen())*(xmax1-xmin1))**dble(1./(delh+.4)) !zpm |
| 221 | if(iclpro.ne.4)then |
| 222 | call psjti0(sngl(zpm*s-pth),sqq,sqqb,1,1) |
| 223 | call psjti0(sngl(zpm*s-pth),sqqp,sqqpb,1,2) |
| 224 | call psjti0(sngl(zpm*s-pth),sqaq,sqaqb,-1,1) |
| 225 | else |
| 226 | call psjti0(sngl(zpm*s-pth),sqqp,sqqpb,4,2) |
| 227 | sqq=0. |
| 228 | sqaq=0. |
| 229 | endif |
| 230 | xpmax=psutz(s,zpm*s,dble(amqpt**2)) !max x+ for sh pomeron |
| 231 | tmax=dlog((1.d0+dsqrt(1.d0-dsqrt(zpm))) |
| 232 | * /(1.d0-dsqrt(1.d0-dsqrt(zpm)))) |
| 233 | tmin=dlog((1.d0+dsqrt(1.d0-xpmax))/(1.d0-dsqrt(1.d0-xpmax))) |
| 234 | |
| 235 | t=(tmin+dble(rangen())*(tmax-tmin)) |
| 236 | xp=1.d0-((1.d0-dexp(-t))/(1.d0+dexp(-t)))**2 !x+_v |
| 237 | xm=zpm/xp !x-_v |
| 238 | if(xm.gt.xp.and.ish.ge.1)write(ifmt,*)'xm,xp',xm,xp |
| 239 | gb=(1.d0-xm)**alpq*(1.d0-xp)**(.5+alpq)*(tmax-tmin) |
| 240 | if(rangen().lt..5)then |
| 241 | xp=xm |
| 242 | xm=zpm/xp |
| 243 | endif |
| 244 | |
| 245 | uv1=psdfh4(sngl(xp*xp1),q2min,0.,iclpro,1) |
| 246 | dv1=psdfh4(sngl(xp*xp1),q2min,0.,iclpro,2) |
| 247 | uv2=psdfh4(sngl(xm*xp2),q2min,0.,icltar,1) |
| 248 | dv2=psdfh4(sngl(xm*xp2),q2min,0.,icltar,2) |
| 249 | wwuu=uv1*uv2*sqq |
| 250 | if(iclpro.eq.2)then |
| 251 | wwdd=dv1*dv2*sqq |
| 252 | elseif(iclpro.eq.1)then |
| 253 | wwdd=dv1*dv2*sqaq |
| 254 | elseif(iclpro.eq.3)then |
| 255 | wwdd=dv1*dv2*sqqp |
| 256 | elseif(iclpro.eq.4)then |
| 257 | wwuu=uv1*uv2*sqqp |
| 258 | wwdd=0. |
| 259 | endif |
| 260 | wwud=uv1*dv2*sqqp |
| 261 | wwdu=dv1*uv2*sqqp |
| 262 | wudt=wwuu+wwdd+wwud+wwdu |
| 263 | |
| 264 | gb=gb*dble(wudt)/zpm**dble(delh+0.4) |
| 265 | * *(1.d0-xp*xp1)**dble(-1.-alpq-alplea(iclpro)) |
| 266 | * *(1.d0-xm*xp2)**dble(-1.-alpq-alplea(icltar))/gb0 |
| 267 | c if(ish.ge.4)then |
| 268 | if(gb.gt.1.d0.and.ish.ge.1)write (ifch,*) |
| 269 | * 'gb-qq,iclpro,zpm,xp,tmax,tmin,xpmax', |
| 270 | * gb,iclpro,zpm,xp,tmax,tmin,xpmax |
| 271 | c endif |
| 272 | if(dble(rangen()).gt.gb)goto 3 |
| 273 | |
| 274 | aks=rangen()*wudt |
| 275 | if(aks.lt.wwuu)then |
| 276 | if(iclpro.ne.4)then |
| 277 | iq1=1 |
| 278 | else |
| 279 | iq1=4*(2.*int(.5+rangen())-1.) |
| 280 | endif |
| 281 | iq2=1 |
| 282 | elseif(aks.lt.wwuu+wwdd)then |
| 283 | if(iclpro.eq.2)then |
| 284 | iq1=2 |
| 285 | elseif(iclpro.eq.1)then |
| 286 | iq1=-2 |
| 287 | elseif(iclpro.eq.3)then |
| 288 | iq1=-3 |
| 289 | else |
| 290 | stop'?????' |
| 291 | endif |
| 292 | iq2=2 |
| 293 | elseif(aks.lt.wwuu+wwdd+wwud)then |
| 294 | if(iclpro.ne.4)then |
| 295 | iq1=1 |
| 296 | else |
| 297 | iq1=4*(2.*int(.5+rangen())-1.) |
| 298 | endif |
| 299 | iq2=2 |
| 300 | else |
| 301 | if(iclpro.eq.2)then |
| 302 | iq1=2 |
| 303 | elseif(iclpro.eq.1)then |
| 304 | iq1=-2 |
| 305 | elseif(iclpro.eq.3)then |
| 306 | iq1=-3 |
| 307 | else |
| 308 | stop'?????' |
| 309 | endif |
| 310 | iq2=1 |
| 311 | endif |
| 312 | |
| 313 | wpi=xp*wp0 !lc+ for the semihard interaction |
| 314 | wmi=xm*wm0 !lc- for the semihard interaction |
| 315 | wp1=(wp0-wpi) |
| 316 | wm1=(wm0-wmi) |
| 317 | wp1=wp1*psutz(wp1*wm1,dble(amqt(2)**2),dble(amqt(4)**2)) |
| 318 | wm1=wm1-amqt(2)**2/wp1 |
| 319 | |
| 320 | !------------------------------------- |
| 321 | else ! sea-sea val-sea sea-val |
| 322 | !------------------------------------- |
| 323 | |
| 324 | if(ish.ge.4)write(ifch,*)'sea-sea val-sea sea-val' |
| 325 | xmin1=xmin**(delh-dels) |
| 326 | xmax1=xmax**(delh-dels) |
| 327 | |
| 328 | if(iqq.eq.0)then !rejection function normalization |
| 329 | gb0=dlog(xpmax0/xpmin0)*(1.d0-dsqrt(xmin))**(2.*betpom) !y_soft = |
| 330 | else |
| 331 | tmax0=acos(dsqrt(xpmin0)) !kinematical limits for t=cos(x+-)**2 |
| 332 | tmin0=acos(dsqrt(xpmax0)) |
| 333 | if(iqq.eq.1)then |
| 334 | uv1=psdfh4(sngl(xpmin0*xp1),q2min,0.,iclpro,1) |
| 335 | * *sngl(1.d0-xpmin0*xp1)**(-1.-alpq-alplea(iclpro)) |
| 336 | dv1=psdfh4(sngl(xpmin0*xp1),q2min,0.,iclpro,2) |
| 337 | * *sngl(1.d0-xpmin0*xp1)**(-1.-alpq-alplea(iclpro)) |
| 338 | else |
| 339 | uv1=psdfh4(sngl(xpmin0*xp2),q2min,0.,icltar,1) |
| 340 | * *sngl(1.d0-xpmin0*xp2)**(-1.-alpq-alplea(icltar)) |
| 341 | dv1=psdfh4(sngl(xpmin0*xp2),q2min,0.,icltar,2) |
| 342 | * *sngl(1.d0-xpmin0*xp2)**(-1.-alpq-alplea(icltar)) |
| 343 | endif |
| 344 | gb0=(1.d0-xmin/xpmax0)**betpom*dble(uv1+dv1) |
| 345 | * *xpmin0**(-0.5+dels) |
| 346 | * *(1.d0-xpmin0)**(0.5+alpq)*(tmax0-tmin0) |
| 347 | if(ish.ge.6)write (ifch,*) |
| 348 | * 'gb0,tmax0,tmin0,xpmax0,xpmin0,xmin,xp1,xp2', |
| 349 | * gb0,tmax0,tmin0,xpmax0,xpmin0,xmin,xp1,xp2 |
| 350 | endif |
| 351 | if(iclpro.ne.4.or.iqq.ne.1)then |
| 352 | call psjti0(sngl(smax-pth),sj,sjb,iqq,0) !inclusive (sj) and born |
| 353 | else |
| 354 | call psjti0(sngl(smax-pth),sj,sjb,4,0) |
| 355 | endif |
| 356 | gb0=gb0*dble(sj)/xmax**delh *1.5d0 !rejection function norm. |
| 357 | if(ish.ge.6)write (ifch,*)'gb0,sj,z',gb0,sj,z |
| 358 | |
| 359 | if(gb0.le.0.)then |
| 360 | write (ifmt,*)'gb0<0, smax,pth',smax,pth |
| 361 | iret=1 |
| 362 | goto 16 |
| 363 | endif |
| 364 | |
| 365 | ! sharing of light cone momenta between soft preevolution and |
| 366 | ! hard interaction: ( first energy-momentum is shared according to |
| 367 | ! f_hard(yj)~zpm**(delh-dels-1) and then rejected as |
| 368 | ! w_rej ~sigma_hard_tot(yj) / exp(delh*yj) |
| 369 | |
| 370 | 4 continue |
| 371 | zpm=(xmin1+dble(rangen())*(xmax1-xmin1))**dble(1./(delh-dels)) !zpm |
| 372 | if(iclpro.ne.4.or.iqq.ne.1)then |
| 373 | call psjti0(sngl(zpm*s-pth),sgg,sggb,0,0)!inclusive (sgg) and born |
| 374 | call psjti0(sngl(zpm*s-pth),sgq,sgqb,0,1) |
| 375 | call psjti0(sngl(zpm*s-pth),sqq,sqqb,1,1) |
| 376 | call psjti0(sngl(zpm*s-pth),sqaq,sqaqb,-1,1) |
| 377 | call psjti0(sngl(zpm*s-pth),sqqp,sqqpb,1,2) |
| 378 | sqq=(sqq+sqaq+2.*(naflav-1)*sqqp)/naflav/2. |
| 379 | else |
| 380 | call psjti0(sngl(zpm*s-pth),sgq,sgqb,4,0) |
| 381 | call psjti0(sngl(zpm*s-pth),sqq,sqqb,4,1) |
| 382 | endif |
| 383 | xpmax=psutz(s,zpm*s,dble(amqpt**2)) !max x+ for sh pomeron |
| 384 | xpmin=zpm/xpmax |
| 385 | if(ish.ge.8)write (ifch,*)'zpm,xpmax,xpmin',zpm,xpmax,xpmin |
| 386 | |
| 387 | if(iqq.eq.0)then |
| 388 | xp=xpmin*(xpmax/xpmin)**rangen() !lc+ share for the hard interaction |
| 389 | xm=zpm/xp !lc- share for the hard interaction |
| 390 | else |
| 391 | tmax=acos(dsqrt(xpmin)) !kinematical limits for t=cos(x+-)**2 |
| 392 | tmin=acos(dsqrt(xpmax)) |
| 393 | t=tmin+dble(rangen())*(tmax-tmin) |
| 394 | xp=cos(t)**2 |
| 395 | xm=zpm/xp |
| 396 | endif |
| 397 | |
| 398 | if(ish.ge.8)write(ifch,*)'zpm,xp,xm,xpmax,xpmin:', |
| 399 | * zpm,xp,xm,xpmax,xpmin |
| 400 | |
| 401 | if(iqq.eq.0)then ! --------- sea-sea ----------- |
| 402 | |
| 403 | dwwgg1=0. |
| 404 | dwwgq1=0. |
| 405 | dwwqg1=0. |
| 406 | dwwqq1=0. |
| 407 | |
| 408 | dwwgg2=0. |
| 409 | dwwgq2=0. |
| 410 | dwwqg2=0. |
| 411 | dwwqq2=0. |
| 412 | |
| 413 | wwgg=sngl((1.d0-xp)*(1.d0-xm))**betpom |
| 414 | wwgq=sngl(1.d0-xp)**betpom*EsoftQZero(sngl(xm)) |
| 415 | wwqg=sngl(1.d0-xm)**betpom*EsoftQZero(sngl(xp)) |
| 416 | wwqq=EsoftQZero(sngl(xp))*EsoftQZero(sngl(xm)) |
| 417 | |
| 418 | if(idfpomr.eq.1)then |
| 419 | rh=r2had(iclpro)+r2had(icltar)-slopom*sngl(dlog(zpm)) |
| 420 | wwgg=(wwgg*z**(rp/rh)/rh+dwwgg1+dwwgg2) |
| 421 | * *(r2had(iclpro)+r2had(icltar))/z |
| 422 | wwgq=(wwgq*z**(rp/rh)/rh+dwwgq1+dwwgq2) |
| 423 | * *(r2had(iclpro)+r2had(icltar))/z |
| 424 | wwqg=(wwqg*z**(rp/rh)/rh+dwwqg1+dwwqg2) |
| 425 | * *(r2had(iclpro)+r2had(icltar))/z |
| 426 | wwqq=(wwqq*z**(rp/rh)/rh+dwwqq1+dwwqq2) |
| 427 | * *(r2had(iclpro)+r2had(icltar))/z |
| 428 | elseif(idfpomr.eq.2)then |
| 429 | rh=r2had(iclpro)+alam3p/2.-slopom*sngl(dlog(zpm)) |
| 430 | wwgg=wwgg/rh*(r2had(iclpro)+alam3p/2.)*z**(rp/rh-1.) |
| 431 | wwqg=wwqg/rh*(r2had(iclpro)+alam3p/2.)*z**(rp/rh-1.) |
| 432 | wwgq=wwgq/rh*(r2had(iclpro)+alam3p/2.)*z**(rp/rh-1.) |
| 433 | wwqq=wwqq/rh*(r2had(iclpro)+alam3p/2.)*z**(rp/rh-1.) |
| 434 | elseif(idfpomr.eq.3)then |
| 435 | rh=r2had(icltar)+alam3p/2.-slopom*sngl(dlog(zpm)) |
| 436 | wwgg=wwgg/rh*(r2had(icltar)+alam3p/2.)*z**(rp/rh-1.) |
| 437 | wwqg=wwqg/rh*(r2had(icltar)+alam3p/2.)*z**(rp/rh-1.) |
| 438 | wwgq=wwgq/rh*(r2had(icltar)+alam3p/2.)*z**(rp/rh-1.) |
| 439 | wwqq=wwqq/rh*(r2had(icltar)+alam3p/2.)*z**(rp/rh-1.) |
| 440 | else |
| 441 | stop'psahot-idfpomr????' |
| 442 | endif |
| 443 | |
| 444 | wwgg=wwgg*sgg*(1.-glusea)**2 |
| 445 | wwgq=wwgq*sgq*(1.-glusea)*glusea |
| 446 | wwqg=wwqg*sgq*(1.-glusea)*glusea |
| 447 | wwqq=wwqq*sqq*glusea**2 |
| 448 | gbyj=dlog(xpmax/xpmin)*dble(wwgg+wwgq+wwqg+wwqq) |
| 449 | wpi=wp0*xp !lc+ for the hard interaction |
| 450 | wmi=wm0*xm !lc+-for the hard interaction |
| 451 | gbyj=gbyj/zpm**dble(delh)/gb0 !rejection fu |
| 452 | if(gbyj.gt.1.d0.and.ish.ge.2)write(ifmt,*)'gbyj',gbyj |
| 453 | if(dble(rangen()).gt.gbyj)goto 4 !rejection |
| 454 | wp1=wp0-wpi |
| 455 | wm1=wm0-wmi |
| 456 | call pslcsh(wp1,wm1,wp2,wm2,amqt,dble(amqpt)) |
| 457 | |
| 458 | else ! --------- val-sea sea-val ----------- |
| 459 | |
| 460 | dwwg=0. |
| 461 | dwwq=0. |
| 462 | |
| 463 | wwgq=sngl(1.d0-xm)**betpom |
| 464 | wwqq=EsoftQZero(sngl(xm)) |
| 465 | if(idfpomr.eq.1)then |
| 466 | rh=r2had(iclpro)+r2had(icltar)-slopom*sngl(dlog(xm)) |
| 467 | wwgq=(wwgq*z**(rp/rh)/rh+dwwg) |
| 468 | * *(r2had(iclpro)+r2had(icltar))/z |
| 469 | wwqq=(wwqq*z**(rp/rh)/rh+dwwq) |
| 470 | * *(r2had(iclpro)+r2had(icltar))/z |
| 471 | else |
| 472 | if(iqq.eq.1)then |
| 473 | rh=r2had(iclpro)+alam3p/2.-slopom*sngl(dlog(xm)) |
| 474 | wwgq=wwgq/rh*(r2had(iclpro)+alam3p/2.)*z**(rp/rh-1.) |
| 475 | wwqq=wwqq/rh*(r2had(iclpro)+alam3p/2.)*z**(rp/rh-1.) |
| 476 | else |
| 477 | rh=r2had(icltar)+alam3p/2.-slopom*sngl(dlog(xm)) |
| 478 | wwgq=wwgq/rh*(r2had(icltar)+alam3p/2.)*z**(rp/rh-1.) |
| 479 | wwqq=wwqq/rh*(r2had(icltar)+alam3p/2.)*z**(rp/rh-1.) |
| 480 | endif |
| 481 | endif |
| 482 | |
| 483 | wwgq=wwgq*sgq*(1.-glusea)*sngl(xp)**(-0.5+dels) |
| 484 | * *sngl(1.d0-xp)**(0.5+alpq) |
| 485 | wwqq=wwqq*sqq*glusea*sngl(xp)**(-0.5+dels) |
| 486 | * *sngl(1.d0-xp)**(0.5+alpq) |
| 487 | |
| 488 | if(iqq.eq.1)then !valence quark-gluon hard interaction |
| 489 | uv1=psdfh4(sngl(xp*xp1),q2min,0.,iclpro,1) |
| 490 | dv1=psdfh4(sngl(xp*xp1),q2min,0.,iclpro,2) |
| 491 | wpi=wp0*xp !lc+ for the hard interaction |
| 492 | wmi=wm0*xm !lc+-for the hard interaction |
| 493 | aks=rangen() |
| 494 | if(aks.lt.uv1/(uv1+dv1))then |
| 495 | if(iclpro.ne.4)then |
| 496 | iq1=1 |
| 497 | else |
| 498 | iq1=4*(2.*int(.5+rangen())-1.) |
| 499 | endif |
| 500 | else |
| 501 | iq1=2 |
| 502 | endif |
| 503 | gbyj=dble((wwgq+wwqq)*(uv1+dv1))*(1.d0-xp*xp1)** |
| 504 | * (-1.-alpq-alplea(iclpro)) |
| 505 | else !gluon-valence quark hard interaction |
| 506 | xm=xp |
| 507 | xp=zpm/xm |
| 508 | uv1=psdfh4(sngl(xm*xp2),q2min,0.,icltar,1) |
| 509 | dv1=psdfh4(sngl(xm*xp2),q2min,0.,icltar,2) |
| 510 | wpi=wp0*xp !lc+ for the hard interaction |
| 511 | wmi=wm0*xm !lc+-for the hard interaction |
| 512 | aks=rangen() |
| 513 | if(aks.lt.uv1/(uv1+dv1))then |
| 514 | iq2=1 |
| 515 | else |
| 516 | iq2=2 |
| 517 | endif |
| 518 | gbyj=dble(wwgq+wwqq)*dble(uv1+dv1)* |
| 519 | * (1.d0-xm*xp2)**(-1.-alpq-alplea(icltar)) |
| 520 | endif |
| 521 | |
| 522 | gbyj=gbyj*(tmax-tmin)/zpm**delh /gb0 /2.1d0 !rejection |
| 523 | if(ish.ge.6)write (ifch,*) |
| 524 | * 'gbyj,zpm,xp,tmax,tmin,xpmax,xpmin', |
| 525 | * gbyj,zpm,xp,tmax,tmin,xpmax,xpmin |
| 526 | if(dble(rangen()).gt.gbyj)goto 4 |
| 527 | |
| 528 | wp1=wp0-wpi |
| 529 | wm1=wm0-wmi |
| 530 | if(ish.ge.8)write (ifch,*)'q_sea mass check',wp1*wm1,amqpt |
| 531 | if(iqq.eq.1)then !valence quark-gluon hard interaction |
| 532 | amq1=amqt(3)**2 |
| 533 | s24=(amqt(2)+amqt(4))**2 |
| 534 | else |
| 535 | amq1=amqt(1)**2 |
| 536 | s24=(amqt(2)+amqt(4))**2 |
| 537 | xp=xm |
| 538 | xm=zpm/xp |
| 539 | endif |
| 540 | x1max=psutz(wp1*wm1,dble(amq1),dble(s24)) |
| 541 | x1min=dble(amq1)/x1max/wp1/wm1 |
| 542 | t1min=(1.d0/x1max-1.d0) |
| 543 | t1max=(1.d0/x1min-1.d0) |
| 544 | 5 t1=t1min*(t1max/t1min)**dble(rangen()) |
| 545 | if(ish.ge.8)write (ifch,*)'t1,t1min,t1max',t1,t1min,t1max |
| 546 | xq1=1.d0/(1.d0+t1) |
| 547 | if(dble(rangen()).gt.(xq1*(1.d0-xq1))**(1.+(-alpqua)))goto 5 |
| 548 | if(iqq.eq.1)then !valence quark-gluon hard interacti |
| 549 | wm2=wm1*(1.d0-xq1) |
| 550 | wm1=wm1*xq1 |
| 551 | wp1=wp1-dble(amq1)/wm1 |
| 552 | if(ish.ge.8)write (ifch,*)'q_sea+ mass check', |
| 553 | * wp1*wm2,s24 |
| 554 | wp1=wp1*psutz(wp1*wm2,dble(amqt(2)**2),dble(amqt(4)**2)) |
| 555 | wm2=wm2-dble(amqt(2))**2/wp1 |
| 556 | else |
| 557 | wp2=wp1*(1.d0-xq1) |
| 558 | wp1=wp1*xq1 |
| 559 | wm1=wm1-dble(amq1)/wp1 |
| 560 | if(ish.ge.8)write (ifch,*)'q_sea- mass check', |
| 561 | * wp2*wm1,s24 |
| 562 | wm1=wm1*psutz(wm1*wp2,dble(amqt(4)**2),dble(amqt(2)**2)) |
| 563 | wp2=wp2-amqt(4)**2/wm1 |
| 564 | endif |
| 565 | |
| 566 | endif ! ------------------- |
| 567 | |
| 568 | !------------------------------- |
| 569 | endif |
| 570 | !------------------------------- |
| 571 | |
| 572 | c------------------------------------------------------------------------- |
| 573 | c flavor and momenta of end partons of the hard Pomeron |
| 574 | c------------------------------------------------------------------------- |
| 575 | |
| 576 | if(ish.ge.4)write(ifch,*) |
| 577 | & 'flavor and momenta of end partons of the hard Pomeron' |
| 578 | |
| 579 | 6 continue |
| 580 | wpi1=wpi |
| 581 | wmi1=wmi |
| 582 | nj=nj0 !initialization for the number of jets |
| 583 | if(ish.ge.8)write (ifch,*)'5-ww,smin',wpi*wmi,smin |
| 584 | |
| 585 | rrr=rangen() |
| 586 | jqq=0 |
| 587 | |
| 588 | call iddeco(icp,jcp) |
| 589 | call iddeco(ict,jct) |
| 590 | |
| 591 | iret1=0 |
| 592 | iret2=0 |
| 593 | |
| 594 | if(iqq.eq.1.or.iqq.eq.2)then |
| 595 | if(rrr.lt.wwqq/(wwgq+wwqq))jqq=1 |
| 596 | elseif(iqq.eq.0)then |
| 597 | if(rrr.lt.wwqg/(wwgg+wwqg+wwgq+wwqq))then |
| 598 | jqq=1 |
| 599 | elseif(rrr.lt.(wwqg+wwgq)/(wwgg+wwqg+wwgq+wwqq))then |
| 600 | jqq=2 |
| 601 | elseif(rrr.lt.(wwqg+wwgq+wwqq)/(wwgg+wwqg+wwgq+wwqq))then |
| 602 | jqq=3 |
| 603 | endif |
| 604 | endif |
| 605 | |
| 606 | if((iqq-1)*(iqq-3).eq.0)then |
| 607 | |
| 608 | if(iabs(idptl(ip)).eq.1220)iq1=3-iq1 !proj=neutron |
| 609 | iqc(1)=iq1 !proj=particle |
| 610 | if(idptl(ip).lt.-1000)iqc(1)=-iq1 !proj=antiparticle |
| 611 | nj=nj+1 |
| 612 | ifl1=iabs(iq1) |
| 613 | |
| 614 | if(iqc(1).gt.0)then |
| 615 | call idsufl(ifl1,1,jcp,iret1) !remove valence quark from remnant |
| 616 | if(iret1.ne.1)ifl=idrafl(iclpro,jcp,2,'s',iret2) !take sea antiquark |
| 617 | elseif(iqc(1).lt.0)then |
| 618 | call idsufl(ifl1,2,jcp,iret1) |
| 619 | if(iret1.ne.1)ifl=idrafl(iclpro,jcp,1,'s',iret2) |
| 620 | else |
| 621 | call utstop('No quark for hard Pomeron+ in psahot!&') |
| 622 | endif |
| 623 | |
| 624 | if(iret1.eq.1.or.iret2.eq.1)then |
| 625 | ifl=ifl1 |
| 626 | if(ish.ge.3)write(ifmt,*)'Not enough place in rem (psahot 1)' |
| 627 | if(ish.ge.5)write(ifch,*)'Not enough place in rem (psahot 1)' |
| 628 | call iddeco(icp,jcp) |
| 629 | iret1=0 |
| 630 | iret2=0 |
| 631 | endif |
| 632 | |
| 633 | if(ish.ge.5)write(ifch,*)'flavor vq+,sqb+',iq1,-ifl |
| 634 | |
| 635 | if(ifl.eq.3)then |
| 636 | iqj(nj)=-isign(ifl,iqc(1))*4/3 |
| 637 | elseif(ifl.eq.4)then |
| 638 | iqj(nj)=-isign(ifl,iqc(1))/4 |
| 639 | else |
| 640 | iqj(nj)=-isign(ifl,iqc(1)) |
| 641 | endif |
| 642 | eqj(1,nj)=.5*sngl(wp1+dble(amqt(2))**2/wp1) |
| 643 | eqj(2,nj)=wp1-eqj(1,nj) |
| 644 | eqj(3,nj)=xxp2pr(ncolp,kcol) |
| 645 | eqj(4,nj)=xyp2pr(ncolp,kcol) |
| 646 | if(ish.ge.8)write (ifch,*)'q_v+ mass check',(eqj(1,nj)- |
| 647 | * eqj(2,nj))*(eqj(1,nj)+eqj(2,nj))-eqj(3,nj)**2-eqj(4,nj)**2 |
| 648 | eqj(1,nj)=sqrt(eqj(2,nj)**2+eqj(3,nj)**2+eqj(4,nj)**2) |
| 649 | ncc(1,1)=nj |
| 650 | ncc(2,1)=0 |
| 651 | |
| 652 | else |
| 653 | |
| 654 | nj=nj+1 |
| 655 | if(idfpomr.ne.3)then |
| 656 | iflq=idrafl(iclpro,jcp,1,'s',iret1) !Choose flavor of sea quark. |
| 657 | if(iret1.ne.1)iflqb=idrafl(iclpro,jcp,2,'s',iret2) !Choose antiquark. |
| 658 | else |
| 659 | iflq=jdrafl(iclpro,jcp,1,iret1) !Choose flavor of sea quark. |
| 660 | iflqb=iflq !antiquark=quark (vertex end) |
| 661 | endif |
| 662 | |
| 663 | if(iret1.eq.1.or.iret2.eq.1)then |
| 664 | iflqb=iflq |
| 665 | if(ish.ge.3)write(ifmt,*)'Not enough place in rem (psahot 2)' |
| 666 | if(ish.ge.5)write(ifch,*)'Not enough place in rem (psahot 2)' |
| 667 | call iddeco(icp,jcp) |
| 668 | iret1=0 |
| 669 | iret2=0 |
| 670 | endif |
| 671 | |
| 672 | if(ish.ge.5)write(ifch,*)'flavor sq+,sqb+',iflq,-iflqb |
| 673 | |
| 674 | if(iflqb.eq.3)then |
| 675 | iqj(nj)=-iflqb*4/3 |
| 676 | elseif(iflqb.eq.4)then |
| 677 | iqj(nj)=-iflqb/4 |
| 678 | else |
| 679 | iqj(nj)=-iflqb |
| 680 | endif |
| 681 | if(iflq.eq.3)then |
| 682 | iqj(nj+1)=iflq*4/3 |
| 683 | elseif(iflq.eq.4)then |
| 684 | iqj(nj+1)=iflq/4 |
| 685 | else |
| 686 | iqj(nj+1)=iflq |
| 687 | endif |
| 688 | eqj(1,nj)=.5*sngl(wp1+dble(amqt(1))**2/wp1) |
| 689 | eqj(2,nj)=wp1-eqj(1,nj) |
| 690 | eqj(3,nj)=xxp1pr(ncolp,kcol) |
| 691 | eqj(4,nj)=xyp1pr(ncolp,kcol) |
| 692 | if(ish.ge.8)write (ifch,*)'q_s1+ mass check',(eqj(1,nj)- |
| 693 | * eqj(2,nj))*(eqj(1,nj)+eqj(2,nj))-eqj(3,nj)**2-eqj(4,nj)**2 |
| 694 | eqj(1,nj)=sqrt(eqj(2,nj)**2+eqj(3,nj)**2+eqj(4,nj)**2) |
| 695 | eqj(1,nj+1)=.5*sngl(wp2+dble(amqt(2))**2/wp2) |
| 696 | eqj(2,nj+1)=wp2-eqj(1,nj+1) |
| 697 | eqj(3,nj+1)=xxp2pr(ncolp,kcol) |
| 698 | eqj(4,nj+1)=xyp2pr(ncolp,kcol) |
| 699 | nj=nj+1 |
| 700 | if(ish.ge.8)write (ifch,*)'q_s2+ mass check',(eqj(1,nj)- |
| 701 | * eqj(2,nj))*(eqj(1,nj)+eqj(2,nj))-eqj(3,nj)**2-eqj(4,nj)**2 |
| 702 | eqj(1,nj)=sqrt(eqj(2,nj)**2+eqj(3,nj)**2+eqj(4,nj)**2) |
| 703 | |
| 704 | if(jqq.eq.0.or.iqq.eq.0.and.jqq.eq.2)then |
| 705 | iqc(1)=0 |
| 706 | ncc(1,1)=nj-1 |
| 707 | ncc(2,1)=nj |
| 708 | else |
| 709 | iqc(1)=int(3*rangen()+1.)*(2.*int(.5+rangen())-1.) |
| 710 | 7 zg=1.d0-dble(rangen())*(1.d0-xp) |
| 711 | if(ish.ge.8)write (ifch,*)'6-zg,xp',zg,xp |
| 712 | if(dble(rangen()).gt.zg**dels*((1.d0-xp/zg)/(1.d0-xp)) |
| 713 | * **betpom)goto 7 |
| 714 | xg=xp/zg |
| 715 | wpq=wp0*(xg-xp) |
| 716 | wmq=1.d0/wpq |
| 717 | wmi1=wmi1-wmq |
| 718 | if(wmi1*wpi1.le.smin)goto 6 |
| 719 | |
| 720 | nj=nj+1 |
| 721 | if(iabs(iqc(1)).eq.3)then |
| 722 | iqj(nj)=-iqc(1)*4/3 |
| 723 | else |
| 724 | iqj(nj)=-iqc(1) |
| 725 | endif |
| 726 | eqj(1,nj)=.5*wmq |
| 727 | eqj(2,nj)=-eqj(1,nj) |
| 728 | eqj(3,nj)=0. |
| 729 | eqj(4,nj)=0. |
| 730 | if(ish.ge.8)write (ifch,*)'q_s3+ mass check',eqj(1,nj)**2- |
| 731 | * eqj(2,nj)**2-eqj(3,nj)**2-eqj(4,nj)**2 |
| 732 | if(iqc(1).gt.0)then |
| 733 | ncj(1,nj)=nj-1 |
| 734 | ncj(1,nj-1)=nj |
| 735 | ncj(2,nj)=0 |
| 736 | ncj(2,nj-1)=0 |
| 737 | ncc(1,1)=nj-2 |
| 738 | ncc(2,1)=0 |
| 739 | else |
| 740 | ncj(1,nj)=nj-2 |
| 741 | ncj(1,nj-2)=nj |
| 742 | ncj(2,nj)=0 |
| 743 | ncj(2,nj-2)=0 |
| 744 | ncc(1,1)=nj-1 |
| 745 | ncc(2,1)=0 |
| 746 | endif |
| 747 | endif |
| 748 | endif |
| 749 | |
| 750 | if((iqq-2)*(iqq-3).eq.0)then |
| 751 | if(iabs(idptl(maproj+it)).eq.1220)iq2=3-iq2 !targ=neutron |
| 752 | iqc(2)=iq2 !tar=particle (can not be pion or kaon !) |
| 753 | if(idptl(maproj+it).lt.-1000)iqc(2)=-iq2 !targ=antiparticle |
| 754 | ifl2=iabs(iq2) |
| 755 | |
| 756 | nj=nj+1 |
| 757 | if(iqc(2).gt.0)then |
| 758 | call idsufl(ifl2,1,jct,iret1) !remove valence quark from remnant |
| 759 | if(iret1.ne.1)ifl=idrafl(icltar,jct,2,'s',iret2) !take sea antiquark |
| 760 | elseif(iqc(2).lt.0)then |
| 761 | call idsufl(ifl2,2,jct,iret1) |
| 762 | if(iret1.ne.1)ifl=idrafl(icltar,jct,1,'s',iret2) |
| 763 | else |
| 764 | call utstop('No quark for hard Pomeron- in psahot!&') |
| 765 | endif |
| 766 | |
| 767 | if(iret1.eq.1.or.iret2.eq.1)then |
| 768 | ifl=ifl2 |
| 769 | if(ish.ge.3)write(ifmt,*)'Not enough place in rem (psahot 3)' |
| 770 | if(ish.ge.5)write(ifch,*)'Not enough place in rem (psahot 3)' |
| 771 | call iddeco(ict,jct) |
| 772 | iret1=0 |
| 773 | iret2=0 |
| 774 | endif |
| 775 | |
| 776 | if(ish.ge.5)write(ifch,*)'flavor vq-,sqb-',iq2,-ifl |
| 777 | |
| 778 | if(ifl.eq.3)then |
| 779 | iqj(nj)=-isign(ifl,iqc(2))*4/3 |
| 780 | elseif(ifl.eq.4)then |
| 781 | iqj(nj)=-isign(ifl,iqc(2))/4 |
| 782 | else |
| 783 | iqj(nj)=-isign(ifl,iqc(2)) |
| 784 | endif |
| 785 | |
| 786 | eqj(1,nj)=.5*sngl(wm1+dble(amqt(4))**2/wm1) |
| 787 | eqj(2,nj)=eqj(1,nj)-sngl(wm1) |
| 788 | eqj(3,nj)=xxm1pr(ncolp,kcol) |
| 789 | eqj(4,nj)=xym1pr(ncolp,kcol) |
| 790 | if(ish.ge.8)write (ifch,*)'q_v- mass check',(eqj(1,nj) |
| 791 | * +eqj(2,nj))*(eqj(1,nj)-eqj(2,nj))-eqj(3,nj)**2-eqj(4,nj)**2 |
| 792 | eqj(1,nj)=sqrt(eqj(2,nj)**2+eqj(3,nj)**2+eqj(4,nj)**2) |
| 793 | ncc(1,2)=nj |
| 794 | ncc(2,2)=0 |
| 795 | else |
| 796 | nj=nj+1 |
| 797 | if(idfpomr.ne.2)then |
| 798 | iflq=idrafl(icltar,jct,1,'s',iret1) !Choose flavor of sea quark. |
| 799 | if(iret1.ne.1)iflqb=idrafl(icltar,jct,2,'s',iret2) !Choose antiquark. |
| 800 | else |
| 801 | iflq=jdrafl(icltar,jct,1,iret1) !Choose flavor of sea quark. |
| 802 | iflqb=iflq !antiquark=quark (vertex end) |
| 803 | endif |
| 804 | |
| 805 | if(iret1.eq.1.or.iret2.eq.1)then |
| 806 | iflqb=iflq |
| 807 | if(ish.ge.3)write(ifmt,*)'Not enough place in rem (psahot 4)' |
| 808 | if(ish.ge.5)write(ifch,*)'Not enough place in rem (psahot 4)' |
| 809 | call iddeco(ict,jct) |
| 810 | iret1=0 |
| 811 | iret2=0 |
| 812 | endif |
| 813 | |
| 814 | if(ish.ge.5)write(ifch,*)'flavor sq-,sqb-',iflq,-iflqb |
| 815 | |
| 816 | if(iflqb.eq.3)then |
| 817 | iqj(nj)=-iflqb*4/3 |
| 818 | elseif(iflqb.eq.4)then |
| 819 | iqj(nj)=-iflqb/4 |
| 820 | else |
| 821 | iqj(nj)=-iflqb |
| 822 | endif |
| 823 | if(iflq.eq.3)then |
| 824 | iqj(nj+1)=iflq*4/3 |
| 825 | elseif(iflq.eq.4)then |
| 826 | iqj(nj+1)=iflq/4 |
| 827 | else |
| 828 | iqj(nj+1)=iflq |
| 829 | endif |
| 830 | eqj(1,nj)=.5*sngl(wm1+dble(amqt(3))**2/wm1) |
| 831 | eqj(2,nj)=eqj(1,nj)-sngl(wm1) |
| 832 | eqj(3,nj)=xxm2pr(ncolp,kcol) |
| 833 | eqj(4,nj)=xym2pr(ncolp,kcol) |
| 834 | if(ish.ge.8)write (ifch,*)'q_s1- mass check',(eqj(1,nj)- |
| 835 | * eqj(2,nj))*(eqj(1,nj)+eqj(2,nj))-eqj(3,nj)**2-eqj(4,nj)**2 |
| 836 | eqj(1,nj)=sqrt(eqj(2,nj)**2+eqj(3,nj)**2+eqj(4,nj)**2) |
| 837 | eqj(1,nj+1)=.5*sngl(wm2+dble(amqt(4))**2/wm2) |
| 838 | eqj(2,nj+1)=eqj(1,nj+1)-wm2 |
| 839 | eqj(3,nj+1)=xxm1pr(ncolp,kcol) |
| 840 | eqj(4,nj+1)=xym1pr(ncolp,kcol) |
| 841 | nj=nj+1 |
| 842 | if(ish.ge.8)write (ifch,*)'q_s2- mass check',(eqj(1,nj)- |
| 843 | * eqj(2,nj))*(eqj(1,nj)+eqj(2,nj))-eqj(3,nj)**2-eqj(4,nj)**2 |
| 844 | eqj(1,nj)=sqrt(eqj(2,nj)**2+eqj(3,nj)**2+eqj(4,nj)**2) |
| 845 | |
| 846 | if(jqq.eq.0.or.iqq.eq.0.and.jqq.eq.1)then |
| 847 | iqc(2)=0 |
| 848 | ncc(1,2)=nj-1 |
| 849 | ncc(2,2)=nj |
| 850 | else |
| 851 | iqc(2)=int(3*rangen()+1.)*(2.*int(.5+rangen())-1.) |
| 852 | 8 zg=1.d0-dble(rangen())*(1.d0-xm) |
| 853 | if(ish.ge.8)write (ifch,*)'7-zg,xm',zg,xm |
| 854 | if(rangen().gt.zg**dels*((1.d0-xm/zg)/(1.d0-xm))**betpom) |
| 855 | * goto 8 |
| 856 | xg=xm/zg |
| 857 | wmq=wm0*(xg-xm) |
| 858 | wpq=1.d0/wmq |
| 859 | wpi1=wpi1-wpq |
| 860 | if(wmi1*wpi1.le.smin)goto 6 |
| 861 | |
| 862 | nj=nj+1 |
| 863 | if(iabs(iqc(2)).eq.3)then |
| 864 | iqj(nj)=-iqc(2)*4/3 |
| 865 | else |
| 866 | iqj(nj)=-iqc(2) |
| 867 | endif |
| 868 | eqj(1,nj)=.5*sngl(wpq) |
| 869 | eqj(2,nj)=eqj(1,nj) |
| 870 | eqj(3,nj)=0. |
| 871 | eqj(4,nj)=0. |
| 872 | if(ish.ge.8)write (ifch,*)'q_s3- mass check',(eqj(1,nj)- |
| 873 | * eqj(2,nj))*(eqj(1,nj)+eqj(2,nj))-eqj(3,nj)**2-eqj(4,nj)**2 |
| 874 | if(iqc(2).gt.0)then |
| 875 | ncj(1,nj)=nj-1 |
| 876 | ncj(1,nj-1)=nj |
| 877 | ncj(2,nj)=0 |
| 878 | ncj(2,nj-1)=0 |
| 879 | ncc(1,2)=nj-2 |
| 880 | ncc(2,2)=0 |
| 881 | else |
| 882 | ncj(1,nj)=nj-2 |
| 883 | ncj(1,nj-2)=nj |
| 884 | ncj(2,nj)=0 |
| 885 | ncj(2,nj-2)=0 |
| 886 | ncc(1,2)=nj-1 |
| 887 | ncc(2,2)=0 |
| 888 | endif |
| 889 | endif |
| 890 | endif |
| 891 | if(jqq.ne.0)then |
| 892 | if(iqq.ne.0.or.iqq.eq.0.and.jqq.eq.3)then |
| 893 | if(iclpro.ne.4.or.iqq.ne.1)then |
| 894 | call psjti0(sngl(wpi1*wmi1-pth),sqq1,sqqb1,1,1) |
| 895 | call psjti0(sngl(wpi1*wmi1-pth),sqaq1,sqaqb1,-1,1) |
| 896 | call psjti0(sngl(wpi1*wmi1-pth),sqqp1,sqqpb1,1,2) |
| 897 | sqq1=(sqq1+sqaq1+2.*(naflav-1)*sqqp1)/naflav/2. |
| 898 | else |
| 899 | call psjti0(sngl(wpi1*wmi1-pth),sqq1,sqqb1,4,1) |
| 900 | endif |
| 901 | gbs=sqq1/sqq |
| 902 | else |
| 903 | call psjti0(sngl(wpi1*wmi1-pth),sgq1,sgqb1,0,1) |
| 904 | gbs=sgq1/sgq |
| 905 | endif |
| 906 | if(ish.ge.8)write (ifch,*)'gbs',gbs |
| 907 | if(rangen().gt.gbs)goto 6 |
| 908 | endif |
| 909 | |
| 910 | |
| 911 | c--------------------------------------------------------------- |
| 912 | c inner partons of the hard Pomeron |
| 913 | c--------------------------------------------------------------- |
| 914 | |
| 915 | if(ish.ge.4)write(ifch,*) |
| 916 | & 'inner partons of the hard Pomeron' |
| 917 | nj00=nj |
| 918 | wpi=wpi1 |
| 919 | wmi=wmi1 |
| 920 | si=wpi*wmi-pxh**2-pyh**2 !total energy squared for the hard |
| 921 | if(ish.ge.7)write (ifch,*)'si,wpi,wmi',si,wpi,wmi |
| 922 | |
| 923 | ept(1)=.5d0*(wpi+wmi) |
| 924 | ept(2)=.5d0*(wpi-wmi) |
| 925 | ept(3)=pxh |
| 926 | ept(4)=pyh |
| 927 | qmin(1)=q2min !effective momentum cutoff above current la |
| 928 | qmin(2)=q2min !effective momentum cutoff below current la |
| 929 | qminn=max(qmin(1),qmin(2)) !effective momentum cutoff for the bo |
| 930 | c si=psnorm(ept) !4-momentum squared for the hard pomeron |
| 931 | jfirst=1 |
| 932 | jj=int(1.5+rangen()) |
| 933 | nemis(1)=0 |
| 934 | nemis(2)=0 |
| 935 | |
| 936 | 9 continue ! <<<<----------- ladder rung --------------------------- |
| 937 | |
| 938 | if(ish.ge.4)write(ifch,*)'ladder rung' |
| 939 | pt2=ept(3)**2+ept(4)**2 |
| 940 | pt=sqrt(sngl(pt2)) |
| 941 | if(iabs(iqc(1)).ne.4)then |
| 942 | q2mass=0. |
| 943 | else |
| 944 | q2mass=qcmass**2 |
| 945 | si=si-dble(q2mass) |
| 946 | endif |
| 947 | s2min=4.*qminn+q2mass !mass cutoff for born scattering |
| 948 | wwmin=5.*qminn+q2mass-2.*pt*sqrt(q2ini) |
| 949 | wwmin=(wwmin+sqrt(wwmin**2+4.*(q2mass+pt2)*(qminn-q2ini))) |
| 950 | */(1.-q2ini/qminn)/2. |
| 951 | if(ish.ge.5)write(ifch,*)'qminn,q2mass,pt,wwmin:' |
| 952 | if(ish.ge.5)write(ifch,*)qminn,q2mass,pt,wwmin |
| 953 | |
| 954 | wpt(1)=ept(1)+ept(2) !lc+ for the current jet emissi |
| 955 | wpt(2)=ept(1)-ept(2) !lc- for the current jet emissi |
| 956 | |
| 957 | if(iabs(iqc(1)).ne.4)then |
| 958 | if(jfirst.eq.1)then |
| 959 | sj=psjti(qmin(jj),qqcut,sngl(si),iqc(jj),iqc(3-jj),0) |
| 960 | sj2=psjti1(qmin(3-jj),qmin(jj),qqcut |
| 961 | * ,sngl(si),iqc(3-jj),iqc(jj),0) |
| 962 | if(ish.ge.5)write(ifch,*)'si,sj,sj2:',si,sj,sj2 |
| 963 | if(rangen().gt.sj2/sj.and.si.gt.1.1d0*dble(wwmin))goto 112 |
| 964 | jfirst=0 |
| 965 | jj=3-jj |
| 966 | sj=sj2 |
| 967 | goto 111 |
| 968 | endif |
| 969 | sj=psjti1(qmin(jj),qmin(3-jj),qqcut,sngl(si),iqc(jj),iqc(3-jj),0) |
| 970 | 111 sjb=psbint(qmin(1),qmin(2),qqcut,sngl(si),iqc(1),iqc(2),0) !born parton-parton |
| 971 | else |
| 972 | sjord=psjci(qmin(2),sngl(si),iqc(2)) |
| 973 | sj=sjord |
| 974 | sjb=psbint(qmin(1),qmin(2),qqcut,sngl(si)+q2mass,iqc(1),iqc(2),0) |
| 975 | if(qmin(2).eq.q2min)then |
| 976 | wwmins=2.5*q2min*(1.+sqrt(1.+ |
| 977 | * 4.*(pt2+q2mass)/q2min)) |
| 978 | if(si.gt.dble(wwmins))call psjti0(sngl(si)+q2mass,sj,sjb |
| 979 | * ,iqc(1),iqc(2)) |
| 980 | endif |
| 981 | endif |
| 982 | if(ish.ge.5)write(ifch,*)'si,pt2,wwmin,s2min,sj,sjb,iqc:' |
| 983 | if(ish.ge.5)write(ifch,*)si,pt2,wwmin,s2min,sj,sjb,iqc |
| 984 | |
| 985 | if(si.lt.1.1d0*dble(wwmin))goto 12 !------>>>>>>> |
| 986 | if(rangen().lt.sjb/sj)goto 12 !------>>>>>>> |
| 987 | |
| 988 | if(iabs(iqc(1)).eq.4)jj=min(2,int(sjord/sj+rangen())+1) !????????? |
| 989 | |
| 990 | 112 continue |
| 991 | |
| 992 | if(iabs(iqc(jj)).ne.4)then |
| 993 | |
| 994 | discr=dble((sngl(si)+2.*pt*sqrt(q2ini)-q2mass)**2 |
| 995 | * -4.*q2ini*(5.*sngl(si)+q2mass+sngl(pt2))) |
| 996 | if(discr.lt.0.d0.and.ish.ge.1)write(ifmt,*)'discr,si,pt,wwmin', |
| 997 | * discr,si,pt,wwmin |
| 998 | discr=dsqrt(discr) |
| 999 | qqmax=(si+2.d0*dble(pt*sqrt(q2ini))-dble(q2mass)+discr)/2.d0 |
| 1000 | * /(5.d0+(dble(q2mass)+pt2)/si) |
| 1001 | qqmin=qqmax-discr/(5.d0+(dble(q2mass)+pt2)/si) |
| 1002 | if(s2min.gt.4.d0*qqmin+dble(q2mass))then |
| 1003 | xmm=.5d0*(si-s2min+2.d0*dble(pt*sqrt(q2ini))) |
| 1004 | discr=xmm**2-si*dble(q2ini)*(1.d0+(dble(q2mass)+pt2)/si) |
| 1005 | if(discr.lt.0..and.ish.ge.1)write(ifmt,*)'discr1,si,pt,wwmin', |
| 1006 | * discr,si,pt,wwmin |
| 1007 | qqmin=(xmm-dsqrt(discr))/(1.d0+(dble(q2mass)+pt2)/si) |
| 1008 | endif |
| 1009 | |
| 1010 | xmax=min(1.d0-dble(q2ini)/qqmax,.9999d0) |
| 1011 | if(qqmin.lt.dble(qmin(jj)))then |
| 1012 | qqmin=dble(qmin(jj)) |
| 1013 | xmin=max(1.d0-((dble(pt)*dsqrt(qqmin)+dsqrt(pt2*qqmin+ |
| 1014 | * si*(si-s2min-qqmin*(1.d0+(dble(q2mass)+pt2)/si))))/si)**2, |
| 1015 | * (s2min+qqmin*(1.d0+(dble(q2mass)+pt2)/si)-2.d0*dble(pt) |
| 1016 | * *dsqrt(qqmin))/si) |
| 1017 | if(xmin.le.0.d0)xmin=s2min/si |
| 1018 | else |
| 1019 | xmin=1.d0-dble(q2ini)/qqmin |
| 1020 | endif |
| 1021 | |
| 1022 | qm0=qmin(jj) |
| 1023 | xm0=1.0-dble(q2ini/qm0) |
| 1024 | if(xm0.gt..999*xmax.or.xm0.lt.1.001*xmin)then |
| 1025 | xm0=.5d0*(xmax+xmin) |
| 1026 | endif |
| 1027 | s2max=sngl(xm0*si-qm0*(dble(q2mass)+pt2)/si) |
| 1028 | * +2.*pt*sqrt(q2ini) |
| 1029 | xx=xm0 |
| 1030 | |
| 1031 | if(iabs(iqc(1)).ne.4)then |
| 1032 | if(jfirst.eq.1)then |
| 1033 | sj0=psjti(qm0,qqcut,s2max,0,iqc(3-jj),0)* |
| 1034 | * psfap(xx,iqc(jj),0)+ |
| 1035 | * psjti(qm0,qqcut,s2max,7,iqc(3-jj),0) |
| 1036 | * *psfap(xx,iqc(jj),1) |
| 1037 | else |
| 1038 | sj0=psjti1(qm0,qmin(3-jj),qqcut,s2max,0,iqc(3-jj),0)* |
| 1039 | * psfap(xx,iqc(jj),0)+ |
| 1040 | * psjti1(qm0,qmin(3-jj),qqcut,s2max,7,iqc(3-jj),0) |
| 1041 | * *psfap(xx,iqc(jj),1) |
| 1042 | endif |
| 1043 | else |
| 1044 | sj0=psjci(qm0,s2max,0)*psfap(xx,iqc(jj),0)+ |
| 1045 | * psjci(qm0,s2max,1)*psfap(xx,iqc(jj),1) |
| 1046 | endif |
| 1047 | |
| 1048 | gb0=dble(sj0/log(q2ini/qcdlam)*qm0*5.)*psuds(qm0,iqc(jj)) |
| 1049 | if(ish.ge.5)write(ifch,*)'gb0,qm0,xm0,s2max:', |
| 1050 | * gb0,qm0,xm0,s2max |
| 1051 | c if(gb0.le.0.)stop'gb0<=0' |
| 1052 | if(gb0.le.0.d0)then |
| 1053 | write(ifmt,*)'gb0.le.0. si,pt2:',si,pt2 |
| 1054 | iret=1 |
| 1055 | goto 16 |
| 1056 | endif |
| 1057 | |
| 1058 | if(xm0.le..5d0)then |
| 1059 | gb0=gb0*xm0**(1.-delh) |
| 1060 | else |
| 1061 | gb0=gb0*(1.d0-xm0)*2.d0**delh |
| 1062 | endif |
| 1063 | |
| 1064 | xmin2=max(.5d0,xmin) |
| 1065 | xmin1=xmin**delh |
| 1066 | xmax1=min(xmax,.5d0)**delh |
| 1067 | if(xmin.ge..5d0)then |
| 1068 | djl=1. |
| 1069 | elseif(xmax.le..5d0)then |
| 1070 | djl=0. |
| 1071 | else |
| 1072 | djl=1./(1.+((2.*sngl(xmin))**delh-1.)/delh/ |
| 1073 | * log(2.*(1.-sngl(xmax)))) |
| 1074 | endif |
| 1075 | |
| 1076 | else |
| 1077 | |
| 1078 | xmin=5.d0*dble(q2min)/si |
| 1079 | xmax=min(si/(si+5.0*(pt2+dble(q2mass))),.9999d0) |
| 1080 | qqmax=xmax*si/5.d0 |
| 1081 | qqmin=dble(q2min) |
| 1082 | |
| 1083 | qm0=sngl(qqmin) |
| 1084 | xm0=2.d0/(1.d0+sqrt(1.d0+4.d0*(pt2+dble(q2mass))/qm0)) |
| 1085 | if(xm0.gt..999d0*xmax.or.xm0.lt.1.001d0*xmin)then |
| 1086 | xm0=.5d0*(xmax+xmin) |
| 1087 | endif |
| 1088 | s2max=sngl(xm0*si) |
| 1089 | xx=xm0 |
| 1090 | |
| 1091 | sj0=psjti(qm0,qmin(3-jj),s2max,0,iqc(3-jj),0)* |
| 1092 | * psfap(xx,iqc(jj),0) |
| 1093 | gb0=dble(sj0/log(qm0/qcdlam)*qm0 *5.) |
| 1094 | gb0=gb0*xm0**(1.-delh) |
| 1095 | if(gb0.le.0.d0)then |
| 1096 | if(ish.ge.2)write(ifch,*)'gb0.le.0. (charm) si,pt2:',si,pt2 |
| 1097 | iret=1 |
| 1098 | goto 16 |
| 1099 | endif |
| 1100 | djl=0. |
| 1101 | xmin1=xmin**delh |
| 1102 | xmax1=xmax**delh |
| 1103 | |
| 1104 | endif |
| 1105 | |
| 1106 | if(ish.ge.5)write(ifch,*)'xmin,xmax,qqmin,qqmax:', |
| 1107 | *xmin,xmax,qqmin,qqmax |
| 1108 | |
| 1109 | ntry=0 |
| 1110 | 10 continue |
| 1111 | ntry=ntry+1 |
| 1112 | if(ntry.gt.5000000)then |
| 1113 | if(ish.ge.1)write(*,*)'Reject hard string (too many rejection)' |
| 1114 | &,kcol,ncolp,nptl,gb7 |
| 1115 | iret=1 |
| 1116 | goto 16 |
| 1117 | endif |
| 1118 | if(rangen().gt.djl)then !lc momentum share in the cur |
| 1119 | x=(xmin1+dble(rangen())*(xmax1-xmin1))**(1./delh) |
| 1120 | else |
| 1121 | x=1.d0-(1.d0-xmin2)*((1.d0-xmax)/(1.d0-xmin2))**rangen() |
| 1122 | endif |
| 1123 | qq=qqmin/(1.d0+dble(rangen())*(qqmin/qqmax-1.d0)) |
| 1124 | if(ish.ge.7)write(ifch,*)'x,qq:',x,qq,ntry |
| 1125 | |
| 1126 | if(iabs(iqc(jj)).ne.4)then |
| 1127 | |
| 1128 | qt2=qq*(1.d0-x) |
| 1129 | if(qt2.lt.dble(q2ini))then |
| 1130 | if(ish.ge.7)write(ifch,*)'qt2:',qt2 |
| 1131 | goto 10 |
| 1132 | endif |
| 1133 | |
| 1134 | qmin2=max(qminn,sngl(qq)) |
| 1135 | qt=dsqrt(qt2) |
| 1136 | call pscs(bcos,bsin) |
| 1137 | ep3(3)=sngl(qt)*bcos !new parton pt-s |
| 1138 | ep3(4)=sngl(qt)*bsin |
| 1139 | ptnew=(ept(3)-dble(ep3(3)))**2+(ept(4)-dble(ep3(4)))**2 |
| 1140 | s2min2=4.*qmin2+q2mass |
| 1141 | |
| 1142 | s2=x*(si-qq)-ptnew-qq*(dble(q2mass)+pt2)/si+pt2 !new ladder mass |
| 1143 | if(s2.lt.dble(s2min2))then |
| 1144 | if(ish.ge.7)write(ifch,*)'s2,s2min2:',s2,s2min2 |
| 1145 | goto 10 !rejection in case of too low mass |
| 1146 | endif |
| 1147 | |
| 1148 | xx=x |
| 1149 | if(iabs(iqc(1)).ne.4)then |
| 1150 | if(jfirst.eq.1)then |
| 1151 | sj1=psjti(sngl(qq),qqcut,sngl(s2),0,iqc(3-jj),0) |
| 1152 | if(iqc(jj).ne.0)then !f1 - f2 |
| 1153 | sj2=psjti(sngl(qq),qqcut,sngl(s2),iqc(jj),iqc(3-jj),0) |
| 1154 | elseif(iqc(3-jj).eq.0)then !f1 - g |
| 1155 | sj2=psjti(sngl(qq),qqcut,sngl(s2),1,0,0) |
| 1156 | else !g - f2 |
| 1157 | sj2=psjti(sngl(qq),qqcut,sngl(s2),1,1,0)/naflav/2. !q - q |
| 1158 | * +psjti(sngl(qq),qqcut,sngl(s2),-1,1,0)/naflav/2. !q~ - q |
| 1159 | * +psjti(sngl(qq),qqcut,sngl(s2),1,2,0)*(1.-1./naflav) !q' - q |
| 1160 | endif |
| 1161 | else |
| 1162 | sj1=psjti1(sngl(qq),qmin(3-jj),qqcut,sngl(s2),0,iqc(3-jj),0) |
| 1163 | if(iqc(jj).ne.0)then !f1 - f2 |
| 1164 | sj2=psjti1(sngl(qq),qmin(3-jj),qqcut |
| 1165 | * ,sngl(s2),iqc(jj),iqc(3-jj),0) |
| 1166 | elseif(iqc(3-jj).eq.0)then !f1 - g |
| 1167 | sj2=psjti1(sngl(qq),qmin(3-jj),qqcut,sngl(s2),1,0,0) |
| 1168 | else !g - f2 |
| 1169 | sj2=psjti1(sngl(qq),qmin(3-jj),qqcut |
| 1170 | * ,sngl(s2),1,1,0)/naflav/2. !q - q |
| 1171 | * +psjti1(sngl(qq),qmin(3-jj),qqcut |
| 1172 | * ,sngl(s2),-1,1,0)/naflav/2. !q~ - q |
| 1173 | * +psjti1(sngl(qq),qmin(3-jj),qqcut |
| 1174 | * ,sngl(s2),1,2,0)*(1.-1./naflav)!q' - q |
| 1175 | endif |
| 1176 | endif |
| 1177 | else |
| 1178 | sj1=psjci(sngl(qq),sngl(s2),0) |
| 1179 | sj2=psjci(sngl(qq),sngl(s2),1) |
| 1180 | endif |
| 1181 | |
| 1182 | !...gb7 - rejection function for x and q**2 simulation |
| 1183 | gb7=dble((sj1*psfap(xx,iqc(jj),0)+sj2*psfap(xx,iqc(jj),1))/ |
| 1184 | * log(sngl(qt2)/qcdlam))*psuds(sngl(qq),iqc(jj))*qq/gb0 |
| 1185 | |
| 1186 | if(x.le..5d0)then |
| 1187 | gb7=gb7*x**(1.-delh) |
| 1188 | else |
| 1189 | gb7=gb7*(1.d0-x)*2.d0**delh |
| 1190 | endif |
| 1191 | if(gb7.gt.1..and.ish.ge.2)write(ifmt,*)'gb7,qq,x,qm0,xm0', |
| 1192 | * gb7,qq,x,qm0,xm0 |
| 1193 | if(ish.ge.7)write(ifch,*)'gb7:',gb7 |
| 1194 | if(dble(rangen()).gt.gb7)goto 10 |
| 1195 | else |
| 1196 | qmin2=max(qminn,sngl(qq)) |
| 1197 | s2min2=4.*qmin2 |
| 1198 | s2=x*si-qq !new ladder mass |
| 1199 | if(s2.lt.dble(s2min2))goto 10 !rejection in case of too low mass |
| 1200 | |
| 1201 | call pscs(bcos,bsin) |
| 1202 | xmm=x*(ept(3)*dble(bcos)+ept(4)*dble(bsin)) |
| 1203 | discr=xmm**2+qq*(1.d0-x)-x**2*(pt2+dble(q2mass)) |
| 1204 | if(discr.lt.0.d0)goto 10 |
| 1205 | qt=xmm+dsqrt(discr) |
| 1206 | ep3(3)=sngl(ept(3)-qt*dble(bcos)) !new parton pt-s |
| 1207 | ep3(4)=sngl(ept(4)-qt*dble(bsin)) |
| 1208 | qt2=dble(ep3(3)**2+ep3(4)**2) |
| 1209 | |
| 1210 | xx=x |
| 1211 | sj1=psjti(sngl(qq),qqcut,sngl(s2),0,iqc(3-jj),0) |
| 1212 | sj2=0. |
| 1213 | !.... gb7 - rejection function for x and q**2 simulation |
| 1214 | gb7=dble(sj1*psfap(xx,iqc(jj),0)/ |
| 1215 | * log(sngl(qq)/qcdlam))*qq/gb0 |
| 1216 | gb7=gb7*x**(1.-delh) |
| 1217 | if(gb7.gt.1..and.ish.ge.2)write(ifmt,*)'gb7,qq,x,qm0,xm0', |
| 1218 | * gb7,qq,x,qm0,xm0 |
| 1219 | if(ish.ge.7)write(ifch,*)'gb7:',gb7 |
| 1220 | if(dble(rangen()).gt.gb7)goto 10 |
| 1221 | endif |
| 1222 | |
| 1223 | nqc(2)=0 |
| 1224 | iqnew=iqc(jj) |
| 1225 | if(rangen().lt.sj1/(sj1+sj2))then |
| 1226 | if(iqc(jj).eq.0)then |
| 1227 | jt=1 |
| 1228 | jq=int(1.5+rangen()) |
| 1229 | nqc(1)=ncc(jq,jj) |
| 1230 | else |
| 1231 | jt=2 |
| 1232 | if(iqc(jj).gt.0)then |
| 1233 | jq=1 |
| 1234 | else |
| 1235 | jq=2 |
| 1236 | endif |
| 1237 | nqc(1)=0 |
| 1238 | iqnew=0 |
| 1239 | endif |
| 1240 | iq1=iqc(jj) |
| 1241 | |
| 1242 | else |
| 1243 | if(iqc(jj).ne.0)then |
| 1244 | iq1=0 |
| 1245 | jt=3 |
| 1246 | if(iqc(jj).gt.0)then |
| 1247 | jq=1 |
| 1248 | else |
| 1249 | jq=2 |
| 1250 | endif |
| 1251 | nqc(1)=ncc(1,jj) |
| 1252 | else |
| 1253 | jt=4 |
| 1254 | jq=int(1.5+rangen()) |
| 1255 | iq1=int(naflav*rangen()+1.)*(3-2*jq) |
| 1256 | iqnew=-iq1 |
| 1257 | nqc(1)=ncc(jq,jj) |
| 1258 | endif |
| 1259 | endif |
| 1260 | if(iabs(iqc(jj)).ne.4)then |
| 1261 | q2part=0. |
| 1262 | c write(*,*)'sem:',wpt(jj),pt2,q2mass,wpt(3-jj),jj |
| 1263 | if(dabs(wpt(3-jj)).gt.1.d-20)then |
| 1264 | wplc=wpt(jj)-(pt2+dble(q2mass))/wpt(3-jj) |
| 1265 | else |
| 1266 | if(ish.gt.1)write(ifmt,*)'Problem with wpt in sem',wpt(3-jj) |
| 1267 | wplc=wpt(jj)-(pt2+dble(q2mass)) |
| 1268 | endif |
| 1269 | qp2max=max(0.,sngl(qt2)) |
| 1270 | else |
| 1271 | q2part=q2mass |
| 1272 | wplc=wpt(jj) |
| 1273 | qp2max=max(0.,sngl(qq)) |
| 1274 | endif |
| 1275 | eprt=max(dsqrt(qt2+dble(q2part)),.5d0*((1.d0-x)*wplc+ |
| 1276 | *(qt2+dble(q2part))/(1.d0-x)/wplc)) |
| 1277 | pl=((1.d0-x)*wplc-eprt)*dble(3-2*jj) |
| 1278 | if(iq1.eq.0)then |
| 1279 | iq2ini=9 |
| 1280 | else |
| 1281 | iq2ini=iq1 |
| 1282 | endif |
| 1283 | if(ish.ge.5)write(ifch,*)'qq,eprt,iq2ini',qq,eprt,iq2ini, |
| 1284 | *eprt**2-qt2 |
| 1285 | ntest=0 |
| 1286 | 11 ntest=ntest+1 |
| 1287 | call timsh1(qp2max,sngl(eprt),iq2ini) |
| 1288 | amprt=pprt(5,1)**2 |
| 1289 | plprt=max(0.d0,eprt**2-qt2)-dble(amprt) |
| 1290 | if(plprt.lt.0.d0)then |
| 1291 | if(ntest.lt.10000)then |
| 1292 | goto 11 |
| 1293 | else |
| 1294 | iret=1 |
| 1295 | goto 16 |
| 1296 | endif |
| 1297 | endif |
| 1298 | ep3(1)=sngl(eprt) |
| 1299 | ep3(2)=sngl(dsqrt(plprt)) |
| 1300 | if(pl.lt.0.d0)ep3(2)=-ep3(2) |
| 1301 | ey(1)=1. |
| 1302 | ey(2)=1. |
| 1303 | ey(3)=1. |
| 1304 | do i=1,4 |
| 1305 | ept1(i)=ept(i)-dble(ep3(i)) |
| 1306 | enddo |
| 1307 | call psdefrot(ep3,s0xh,c0xh,s0h,c0h) |
| 1308 | s2new=psnorm(ept1) |
| 1309 | |
| 1310 | if(iabs(iqc(jj)).ne.4.and.s2new-q2mass.gt.s2min2.or. |
| 1311 | *iabs(iqc(jj)).eq.4.and.s2new.gt.s2min2)then |
| 1312 | if(iabs(iqc(1)).ne.4.or.jj.eq.1)then |
| 1313 | if(jfirst.eq.1)then |
| 1314 | gb=dble(psjti(sngl(qq),qqcut,s2new,iqnew,iqc(3-jj),0)) |
| 1315 | else |
| 1316 | gb=dble(psjti1(sngl(qq),qmin(3-jj),qqcut,s2new,iqnew, |
| 1317 | * iqc(3-jj),0)) |
| 1318 | endif |
| 1319 | else |
| 1320 | gb=dble(psjci(sngl(qq),s2new-q2mass,iqnew)) |
| 1321 | endif |
| 1322 | if(iqnew.eq.0)then |
| 1323 | gb=gb/dble(sj1) |
| 1324 | else |
| 1325 | gb=gb/dble(sj2) |
| 1326 | endif |
| 1327 | if(dble(rangen()).gt.gb)goto 10 |
| 1328 | else |
| 1329 | goto 10 |
| 1330 | endif |
| 1331 | |
| 1332 | if(ish.ge.6)write(ifch,*)'jt,jj,jq,nqc:',jt,jj,jq,nqc |
| 1333 | nprtjx=0 |
| 1334 | call psreti(nqc,jq,1,ey,s0xh,c0xh,s0h,c0h) |
| 1335 | |
| 1336 | if(jt.eq.1)then |
| 1337 | ncc(jq,jj)=nqc(2) |
| 1338 | elseif(jt.eq.2)then |
| 1339 | ncc(jq,jj)=ncc(1,jj) |
| 1340 | ncc(3-jq,jj)=nqc(1) |
| 1341 | elseif(jt.eq.3)then |
| 1342 | ncc(1,jj)=nqc(2) |
| 1343 | elseif(jt.eq.4)then |
| 1344 | ncc(1,jj)=ncc(3-jq,jj) |
| 1345 | endif |
| 1346 | iqc(jj)=iqnew |
| 1347 | |
| 1348 | do i=1,4 |
| 1349 | ept(i)=ept1(i) |
| 1350 | enddo |
| 1351 | ! c.m. energy squared, minimal 4-momentum transfer square and gluon 4-v |
| 1352 | ! for the next ladder run |
| 1353 | qmin(jj)=sngl(qq) |
| 1354 | qminn=qmin2 |
| 1355 | si=dble(s2new) |
| 1356 | nemis(jj)=nemis(jj)+1 |
| 1357 | |
| 1358 | goto 9 ! ---------------next ladder rung ------------>>>>>>>>>>> |
| 1359 | |
| 1360 | |
| 1361 | 12 continue !------------------- Born process------------------------ |
| 1362 | |
| 1363 | if(ish.ge.4)write(ifch,*)'Born process' |
| 1364 | if(ish.ge.6)write(ifch,*)'iqc,si:',iqc,si |
| 1365 | qq=dble(qminn) |
| 1366 | |
| 1367 | !kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk |
| 1368 | xpprbor(ncolp,kcol)=(ept(1)+ept(2))/dble(engy) |
| 1369 | xmprbor(ncolp,kcol)=(ept(1)-ept(2))/dble(engy) |
| 1370 | nemispr(1,ncolp,kcol)=nemis(1) |
| 1371 | nemispr(2,ncolp,kcol)=nemis(2) |
| 1372 | ! write(*,'(a,2f8.3,i3,3x,2i3)')'------------' |
| 1373 | ! * ,xpprbor(ncolp,kcol),xmprbor(ncolp,kcol),nj-nj00,nemis |
| 1374 | !kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk |
| 1375 | |
| 1376 | call psabor(sngl(si),sngl(qq),iqc,ncc,ept,0,iptl,bx) |
| 1377 | |
| 1378 | !kkkkkkkkkkkkk out Born partons without timelike cascade |
| 1379 | if(nprtjx.eq.2)then |
| 1380 | do ii=1,2 |
| 1381 | ptprboo(ii,ncolp,kcol)=sqrt(pprtx(1,ii)**2+pprtx(2,ii)**2) |
| 1382 | enddo |
| 1383 | else |
| 1384 | stop'psahot: should not happen!!!! ' |
| 1385 | endif |
| 1386 | !kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk |
| 1387 | ! ptxxx=max( ptprboo(1,ncolp,kcol) , ptprboo(2,ncolp,kcol) ) |
| 1388 | ! print*,sqrt(wm0*wp0),sqrt(wmi*wpi),ptxxx !++++++++++++++++++++++++++ |
| 1389 | ! if(ptxxx.lt.10)goto1 |
| 1390 | ! print*,' ++++++++++++++++++++++++++++++++++++ ' |
| 1391 | !kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk |
| 1392 | if(nj.ne.0.)then |
| 1393 | do i=1,nj |
| 1394 | do l=1,6 |
| 1395 | bxj(l,i)=bx(l) |
| 1396 | enddo |
| 1397 | ityj(i)=ity |
| 1398 | iorj(i)=iptl |
| 1399 | enddo |
| 1400 | endif |
| 1401 | |
| 1402 | call psjarr(jfl) !kinky strings formation |
| 1403 | |
| 1404 | if(jfl.eq.0.and.ish.ge.4)write(ifch,*) |
| 1405 | *'jfl,nj,nptl',jfl,nj,nptl |
| 1406 | if(jfl.eq.0)goto 1 |
| 1407 | |
| 1408 | c --- update remnant flavour --- |
| 1409 | |
| 1410 | iret1=0 |
| 1411 | call idenco(jcp,icp,iret1) |
| 1412 | if(iret1.eq.1)call utstop('Problem with proj rem in psahot!&') |
| 1413 | iret2=0 |
| 1414 | call idenco(jct,ict,iret2) |
| 1415 | if(iret2.eq.1)call utstop('Problem with targ rem in psahot!&') |
| 1416 | |
| 1417 | do i=1,2 |
| 1418 | icproj(i,ip)=icp(i) |
| 1419 | ictarg(i,it)=ict(i) |
| 1420 | enddo |
| 1421 | |
| 1422 | if(ish.ge.3)write(ifch,*)'End psahot (icp,ict):',icp,ict |
| 1423 | |
| 1424 | if(iep(ip).ne.1)then |
| 1425 | call idtr4(idptl(ip),icini) !excited remnant ? |
| 1426 | if(ish.ge.5)write(ifch,*)'icini proj',icini |
| 1427 | & ,(icp(1)-icini(1)),(icp(2)-icini(2)) |
| 1428 | if((icp(1)-icini(1))+(icp(2)-icini(2)).ne.0)iep(ip)=1 |
| 1429 | endif |
| 1430 | if(iet(it).ne.1)then |
| 1431 | call idtr4(idptl(maproj+it),icini) |
| 1432 | if(ish.ge.5)write(ifch,*)'icini targ',icini |
| 1433 | & ,(ict(1)-icini(1)),(ict(2)-icini(2)) |
| 1434 | if((ict(1)-icini(1))+(ict(2)-icini(2)).ne.0)iet(it)=1 |
| 1435 | endif |
| 1436 | if(ish.ge.5)write(ifch,*)'iep,iet ',iep(ip),iet(it) |
| 1437 | |
| 1438 | c ------------------------------ |
| 1439 | |
| 1440 | 16 continue |
| 1441 | call utprix('psahot',ish,ishini,3) |
| 1442 | |
| 1443 | q2fin=q2finsave |
| 1444 | return |
| 1445 | end |
| 1446 | |
| 1447 | c------------------------------------------------------------------------ |
| 1448 | subroutine psjarr(jfl) |
| 1449 | c----------------------------------------------------------------------- |
| 1450 | c |
| 1451 | c final jets rearrangement according to their colour connection |
| 1452 | c and write to /cptl/ |
| 1453 | c |
| 1454 | c jfl - flag for the rejection (in case of jfl=0) |
| 1455 | c----------------------------------------------------------------------- |
| 1456 | c Input: |
| 1457 | |
| 1458 | parameter (mjstr=20000) |
| 1459 | common /psar29/ eqj(4,mjstr),iqj(mjstr),ncj(2,mjstr),nj |
| 1460 | |
| 1461 | c eqj(1:4,k) - 4-momentum (qgs) for k-th parton; |
| 1462 | c bxj(1:4,k) - coordinates for k-th parton formation point; |
| 1463 | c iqj(k) - ID (qgs) for k-th parton; |
| 1464 | c ncj(1:2,k) - colour connected partons indexes for k-th parton; |
| 1465 | c nj - number of partons |
| 1466 | c----------------------------------------------------------------------- |
| 1467 | dimension mark(mjstr) |
| 1468 | double precision ept(4) |
| 1469 | include 'epos.inc' |
| 1470 | include 'epos.incsem' |
| 1471 | |
| 1472 | if(nj.eq.0)then |
| 1473 | jfl=1 |
| 1474 | return |
| 1475 | endif |
| 1476 | c do k=1,nj !??????????????? |
| 1477 | c eqj(1,k)=dsqrt(0d0+eqj(2,k)**2+eqj(3,k)**2+eqj(4,k)**2) |
| 1478 | c enddo |
| 1479 | if(ish.ge.3)then |
| 1480 | write (ifch,*)'psjarr: nj',nj |
| 1481 | do k=1,nj |
| 1482 | if(iqj(k).ne.0)ncj(2,k)=0 |
| 1483 | write(ifch,'(a,i4)')' parton',k |
| 1484 | write(ifch,'(i3,2x,4e10.3,2x,2i3)')iqj(k) |
| 1485 | * ,(eqj(j,k),j=1,4),(ncj(j,k),j=1,2) |
| 1486 | enddo |
| 1487 | endif |
| 1488 | |
| 1489 | jfl=0 |
| 1490 | do i=1,nj |
| 1491 | mark(i)=1 |
| 1492 | enddo |
| 1493 | nptl0=nptl |
| 1494 | if(ish.ge.5)write (ifch,*)'nptl,nj',nptl,nj |
| 1495 | |
| 1496 | 1 continue |
| 1497 | do ij=1,nj |
| 1498 | if(mark(ij).ne.0.and.iqj(ij).ne.0)goto 2 |
| 1499 | enddo |
| 1500 | 2 continue |
| 1501 | jfirst=1 |
| 1502 | if(iabs(iqj(ij)).le.2)then |
| 1503 | am1=amhadr(1) |
| 1504 | elseif(iabs(iqj(ij)).eq.4)then |
| 1505 | am1=amhadr(3) |
| 1506 | elseif(iabs(iqj(ij)).eq.40)then |
| 1507 | am1=qcmass |
| 1508 | else |
| 1509 | am1=amhadr(2) |
| 1510 | endif |
| 1511 | |
| 1512 | do i=1,4 |
| 1513 | ept(i)=0. |
| 1514 | enddo |
| 1515 | |
| 1516 | 3 continue |
| 1517 | call pspawr(ij) |
| 1518 | mark(ij)=0 |
| 1519 | |
| 1520 | do i=1,4 |
| 1521 | ept(i)=ept(i)+eqj(i,ij) |
| 1522 | enddo |
| 1523 | |
| 1524 | if(iqj(ij).ne.0)then |
| 1525 | if(jfirst.ne.1)then |
| 1526 | if(iabs(iqj(ij)).le.2)then |
| 1527 | am2=amhadr(1) |
| 1528 | elseif(iabs(iqj(ij)).eq.4)then |
| 1529 | am2=amhadr(3) |
| 1530 | elseif(iabs(iqj(ij)).eq.40)then |
| 1531 | am2=qcmass |
| 1532 | else |
| 1533 | am2=amhadr(2) |
| 1534 | endif |
| 1535 | amj=(am1+am2+stmass)**2 |
| 1536 | sm=psnorm(ept) |
| 1537 | if(sm.lt.amj)then |
| 1538 | nptl=nptl0 |
| 1539 | goto999 |
| 1540 | endif |
| 1541 | |
| 1542 | if(nptl-nptl0.lt.nj)then |
| 1543 | goto 1 |
| 1544 | else |
| 1545 | if(ish.ge.3)then |
| 1546 | write (ifch,*)'psjarr: nptl',nptl |
| 1547 | do k=nptl0,nptl |
| 1548 | write(ifch,'(a,i4)')' particle',k |
| 1549 | write(ifch,'(i5,2x,5e10.3)')idptl(k) |
| 1550 | * ,(pptl(j,k),j=1,5) |
| 1551 | enddo |
| 1552 | endif |
| 1553 | jfl=1 |
| 1554 | goto999 |
| 1555 | endif |
| 1556 | else |
| 1557 | jfirst=0 |
| 1558 | njpar=ij |
| 1559 | ij=ncj(1,ij) |
| 1560 | goto 3 |
| 1561 | endif |
| 1562 | |
| 1563 | else |
| 1564 | if(ncj(1,ij).eq.njpar)then |
| 1565 | njdau=ncj(2,ij) |
| 1566 | else |
| 1567 | njdau=ncj(1,ij) |
| 1568 | endif |
| 1569 | njpar=ij |
| 1570 | ij=njdau |
| 1571 | goto 3 |
| 1572 | endif |
| 1573 | 999 continue |
| 1574 | end |
| 1575 | |
| 1576 | c------------------------------------------------------------------------ |
| 1577 | subroutine pspawr(kj) |
| 1578 | c----------------------------------------------------------------------- |
| 1579 | c pspawr - writing final parton kj into particle list |
| 1580 | c------------------------------------------------------------------------ |
| 1581 | c Input: |
| 1582 | |
| 1583 | parameter (mjstr=20000) |
| 1584 | common /psar29/ eqj(4,mjstr),iqj(mjstr),ncj(2,mjstr),nj |
| 1585 | common /psar30/ iorj(mjstr),ityj(mjstr),bxj(6,mjstr) |
| 1586 | |
| 1587 | c eqj(1:4,k) - 4-momentum (qgs) for k-th parton; |
| 1588 | c bxj(1:4,k) - coordinates for k-th parton formation point; |
| 1589 | c iqj(k) - ID (qgs) for k-th parton; |
| 1590 | c ncj(1:2,k) - colour connected partons indexes for k-th parton; |
| 1591 | c nj - number of partons |
| 1592 | c----------------------------------------------------------------------- |
| 1593 | include 'epos.inc' |
| 1594 | include 'epos.incsem' |
| 1595 | common/ciptl/iptl |
| 1596 | |
| 1597 | if(ish.ge.9)write (ifch,*)'nptl,kj (sto)',nptl,kj |
| 1598 | if(nptl.ge.mxptl)then |
| 1599 | write (ifmt,*)'nptl,kj',nptl,kj |
| 1600 | call alist('Error in pspawr: nptl out of bounds &',1,nptl) |
| 1601 | stop'nptl out of bounds' |
| 1602 | endif |
| 1603 | |
| 1604 | if(ifrptl(1,iptl).eq.0)ifrptl(1,iptl)=nptl+1 |
| 1605 | ifrptl(2,iptl)=nptl+1 |
| 1606 | |
| 1607 | nptl=nptl+1 |
| 1608 | pptl(1,nptl)=eqj(3,kj) |
| 1609 | pptl(2,nptl)=eqj(4,kj) |
| 1610 | pptl(3,nptl)=eqj(2,kj) |
| 1611 | pptl(4,nptl)=eqj(1,kj) |
| 1612 | pptl(5,nptl)=0. |
| 1613 | idptl(nptl)=psidd(iqj(kj)) |
| 1614 | iorptl(nptl)=iorj(kj) |
| 1615 | jorptl(nptl)=0 |
| 1616 | istptl(nptl)=20 |
| 1617 | do i=1,4 |
| 1618 | xorptl(i,nptl)=bxj(i,kj) |
| 1619 | enddo |
| 1620 | tivptl(1,nptl)=bxj(5,kj) |
| 1621 | tivptl(2,nptl)=bxj(6,kj) |
| 1622 | ityptl(nptl)=ityj(kj) |
| 1623 | !kkkkkkkkkkkkkkkkkkkkkkk |
| 1624 | ! write(*,'(a,2i4,i6,f8.3)')'.... ',kj,nptl,idptl(nptl) |
| 1625 | !* ,sqrt(pptl(1,nptl)**2+pptl(2,nptl)**2) |
| 1626 | return |
| 1627 | end |
| 1628 | |
| 1629 | c------------------------------------------------------------------------ |
| 1630 | subroutine psabor(si,qq,iqc,ncc,ept,jdis,iptl,coordo) |
| 1631 | c------------------------------------------------------------------------ |
| 1632 | c psabor - highest virtuality subprocess in the ladder |
| 1633 | c si - c.m. energy squared for the process, |
| 1634 | c qq - p_t-cutoff for the process due to the evolution, |
| 1635 | c iqc(i), i=1,2 - incoming parton types(0-g,(+-)1-u(u~),(+-)2-d(d~)etc.), |
| 1636 | c ncc(i,j), i,j=1,2 - incoming partons color connections, |
| 1637 | c ept(4) - total 4-momentum for the system of the 2 partons |
| 1638 | c jdis=0 - hadronic process in pp; 1 - resolved photon process |
| 1639 | c------------------------------------------------------------------------ |
| 1640 | double precision ept(4),psutz,psuds |
| 1641 | dimension ep3(4),ey(3),wsub(5),iqc(2),ncc(2,2),nqc(2),coordo(6) |
| 1642 | parameter (mjstr=20000) |
| 1643 | common /psar29/eqj(4,mjstr),iqj(mjstr),ncj(2,mjstr),nj |
| 1644 | parameter (ntim=1000) |
| 1645 | common/cprt/nprtj,pprt(5,ntim),idprt(ntim),iorprt(ntim) |
| 1646 | &,idaprt(2,ntim) |
| 1647 | common/cprtx/nprtjx,pprtx(5,2) |
| 1648 | include 'epos.incsem' |
| 1649 | include 'epos.inc' |
| 1650 | call utpri('psabor',ish,ishini,5) |
| 1651 | |
| 1652 | if(iabs(iqc(1)).ne.4)then !gluon or light quark |
| 1653 | q2mass=0. |
| 1654 | else !c-quark |
| 1655 | q2mass=qcmass**2 |
| 1656 | endif |
| 1657 | p1=si/(1.+q2mass/si) |
| 1658 | if(p1.gt.4.*qq)then !|t|-cutoff (p^2_t>qq) |
| 1659 | tmin=2.*qq/(1.+sqrt(1.-4.*qq/p1)) |
| 1660 | else |
| 1661 | tmin=2.*qq |
| 1662 | endif |
| 1663 | tmax=.5*p1 |
| 1664 | |
| 1665 | fborn=0. |
| 1666 | qt2=tmin*(1.d0-tmin/p1) |
| 1667 | if(qt2.lt..999d0*qq.and.ish.ge.2)write(ifmt,*)'qt20,qq',qt2,qq |
| 1668 | if(iqc(1).ne.0.or.iqc(2).ne.0)then |
| 1669 | do l=1,5 !sum over different subprocesses |
| 1670 | wsub(l)=psbori(si,tmin,iqc(1),iqc(2),l) !matrix element |
| 1671 | if(l.le.3)then |
| 1672 | wsub(l)=wsub(l)*pssalf(qt2/qcdlam)**2 |
| 1673 | elseif(l.le.4)then |
| 1674 | wsub(l)=wsub(l)*pssalf(qt2/qcdlam)*alfe/2/pi |
| 1675 | else |
| 1676 | wsub(l)=wsub(l)*(alfe/2/pi)**2 |
| 1677 | endif |
| 1678 | fborn=fborn+wsub(l) |
| 1679 | enddo |
| 1680 | fborn=tmin**2*fborn |
| 1681 | else |
| 1682 | do l=1,5 |
| 1683 | wsub(l)=psbori(si,.5*si,iqc(1),iqc(2),l) |
| 1684 | if(l.le.3)then |
| 1685 | wsub(l)=wsub(l)*pssalf(qt2/qcdlam)**2 |
| 1686 | elseif(l.le.4)then |
| 1687 | wsub(l)=wsub(l)*pssalf(qt2/qcdlam)*alfe/2/pi |
| 1688 | else |
| 1689 | wsub(l)=wsub(l)*(alfe/2/pi)**2 |
| 1690 | endif |
| 1691 | fborn=fborn+wsub(l) |
| 1692 | enddo |
| 1693 | fborn=.25*si**2*fborn |
| 1694 | endif |
| 1695 | if(jdis.eq.0)then |
| 1696 | scale1=qt2 |
| 1697 | else |
| 1698 | scale1=4.*qt2 |
| 1699 | endif |
| 1700 | gb0=dble(fborn)*psuds(scale1,iqc(1))*psuds(qt2,iqc(2)) |
| 1701 | if(ish.ge.7)write(ifch,*)'tmin,gb0:',tmin,gb0 |
| 1702 | |
| 1703 | c------------------------------------------------ |
| 1704 | c 4-momentum transfer squared is simulated first as dq_t**2/q_t**4 from |
| 1705 | c tmin to s/2 |
| 1706 | 14 q2=tmin/(1.-rangen()*(1.-tmin/tmax)) !q2=min(|t|,|u|) |
| 1707 | qt2=q2*(1.-q2/p1) !qt2=p_t^2 for the process |
| 1708 | if(qt2.lt.qq.and.ish.ge.2)write(ifmt,*)'qt2,qq',qt2,qq |
| 1709 | if(rangen().lt..5)then !|u|=q2, |t|=p1-q2 |
| 1710 | jm=2 !first parton to be considered |
| 1711 | tq=p1-q2 |
| 1712 | else !|t|=q2, |u|=p1-q2 |
| 1713 | jm=1 !first parton to be considered |
| 1714 | tq=q2 |
| 1715 | endif |
| 1716 | |
| 1717 | fborn=0. |
| 1718 | do l=1,5 !sum over different subprocesses |
| 1719 | wsub(l)=psbori(si,tq,iqc(1),iqc(2),l) |
| 1720 | if(l.le.3)then |
| 1721 | wsub(l)=wsub(l)*pssalf(qt2/qcdlam)**2 |
| 1722 | elseif(l.le.4)then |
| 1723 | wsub(l)=wsub(l)*pssalf(qt2/qcdlam)*alfe/2/pi |
| 1724 | else |
| 1725 | wsub(l)=wsub(l)*(alfe/2/pi)**2 |
| 1726 | endif |
| 1727 | fborn=fborn+wsub(l) |
| 1728 | enddo |
| 1729 | if(jdis.eq.0)then |
| 1730 | scale1=qt2 |
| 1731 | else |
| 1732 | scale1=4.*qt2 |
| 1733 | endif |
| 1734 | gb=dble(q2**2*fborn) |
| 1735 | &*psuds(scale1,iqc(1))*psuds(qt2,iqc(2))/gb0 !rejection function |
| 1736 | if(ish.ge.7)write(ifch,*)'q2,qt2,gb:',q2,qt2,gb |
| 1737 | |
| 1738 | if(dble(rangen()).gt.gb)goto 14 !rejection |
| 1739 | |
| 1740 | c determination of the color configuration |
| 1741 | nqc(2)=0 |
| 1742 | if(iqc(1).eq.0.and.iqc(2).eq.0)then !g+g |
| 1743 | jq=int(1.5+rangen()) !jq=1(2) - transfer of color (anticolor) |
| 1744 | nqc(1)=ncc(jq,jm) |
| 1745 | |
| 1746 | if(rangen().lt.wsub(1)/fborn)then !gg->gg |
| 1747 | if(rangen().lt..5)then |
| 1748 | jt=1 !anticolor-color annihilation |
| 1749 | nqc(2)=0 |
| 1750 | njc1=ncc(3-jq,jm) |
| 1751 | njc2=ncc(jq,3-jm) |
| 1752 | if(iqj(njc1).ne.0)then |
| 1753 | ncj(1,njc1)=njc2 |
| 1754 | else |
| 1755 | ncj(jq,njc1)=njc2 |
| 1756 | endif |
| 1757 | if(iqj(njc2).ne.0)then |
| 1758 | ncj(1,njc2)=njc1 |
| 1759 | else |
| 1760 | ncj(3-jq,njc2)=njc1 |
| 1761 | endif |
| 1762 | else |
| 1763 | jt=2 !produced gluons get color and |
| 1764 | nqc(2)=ncc(3-jq,3-jm) !anticolor from the 2 parents |
| 1765 | endif |
| 1766 | else !gg->qq~ |
| 1767 | jt=9 !anticolor-color annihilation |
| 1768 | iqc(jm)=int(naflav*rangen()+1)*(3-2*jq) !(anti)quark flavor |
| 1769 | iqc(3-jm)=-iqc(jm) |
| 1770 | njc1=ncc(3-jq,jm) |
| 1771 | njc2=ncc(jq,3-jm) |
| 1772 | if(iqj(njc1).ne.0)then |
| 1773 | ncj(1,njc1)=njc2 |
| 1774 | else |
| 1775 | ncj(jq,njc1)=njc2 |
| 1776 | endif |
| 1777 | if(iqj(njc2).ne.0)then |
| 1778 | ncj(1,njc2)=njc1 |
| 1779 | else |
| 1780 | ncj(3-jq,njc2)=njc1 |
| 1781 | endif |
| 1782 | endif |
| 1783 | |
| 1784 | elseif(iqc(1)*iqc(2).eq.0)then !q(q~)+g |
| 1785 | if(iqc(1)+iqc(2).gt.0)then |
| 1786 | jq=1 !q |
| 1787 | else |
| 1788 | jq=2 !q~ |
| 1789 | endif |
| 1790 | if(rangen().lt.wsub(1)/fborn)then !q(q~)g->q(q~)g |
| 1791 | if(rangen().lt..5)then !anticolor-color annihilation |
| 1792 | if(iqc(jm).eq.0)then |
| 1793 | jt=3 !first parton=g |
| 1794 | nqc(1)=ncc(jq,jm) |
| 1795 | njc1=ncc(3-jq,jm) |
| 1796 | njc2=ncc(1,3-jm) |
| 1797 | if(iqj(njc1).ne.0)then |
| 1798 | ncj(1,njc1)=njc2 |
| 1799 | else |
| 1800 | ncj(jq,njc1)=njc2 |
| 1801 | endif |
| 1802 | if(iqj(njc2).ne.0)then |
| 1803 | ncj(1,njc2)=njc1 |
| 1804 | else |
| 1805 | ncj(3-jq,njc2)=njc1 |
| 1806 | endif |
| 1807 | |
| 1808 | else |
| 1809 | jt=4 !first parton=q(q~) |
| 1810 | nqc(1)=0 |
| 1811 | njc1=ncc(1,jm) |
| 1812 | njc2=ncc(3-jq,3-jm) |
| 1813 | if(iqj(njc1).ne.0)then |
| 1814 | ncj(1,njc1)=njc2 |
| 1815 | else |
| 1816 | ncj(3-jq,njc1)=njc2 |
| 1817 | endif |
| 1818 | if(iqj(njc2).ne.0)then |
| 1819 | ncj(1,njc2)=njc1 |
| 1820 | else |
| 1821 | ncj(jq,njc2)=njc1 |
| 1822 | endif |
| 1823 | endif |
| 1824 | |
| 1825 | else !color transfer |
| 1826 | if(iqc(jm).eq.0)then |
| 1827 | jt=5 !first parton=g |
| 1828 | nqc(2)=ncc(3-jq,jm) |
| 1829 | nqc(1)=ncc(1,3-jm) |
| 1830 | else !first parton=q(q~) |
| 1831 | jt=6 |
| 1832 | nqc(1)=ncc(jq,3-jm) |
| 1833 | endif |
| 1834 | endif |
| 1835 | |
| 1836 | else !q(q~)g->q(q~)-gamma (+-color annihilation) |
| 1837 | if(iqc(jm).eq.0)then |
| 1838 | jt=11 !first parton=g |
| 1839 | nqc(1)=ncc(jq,jm) |
| 1840 | njc1=ncc(3-jq,jm) |
| 1841 | njc2=ncc(1,3-jm) |
| 1842 | if(iqj(njc1).ne.0)then |
| 1843 | ncj(1,njc1)=njc2 |
| 1844 | else |
| 1845 | ncj(jq,njc1)=njc2 |
| 1846 | endif |
| 1847 | if(iqj(njc2).ne.0)then |
| 1848 | ncj(1,njc2)=njc1 |
| 1849 | else |
| 1850 | ncj(3-jq,njc2)=njc1 |
| 1851 | endif |
| 1852 | iqc(jm)=iqc(3-jm) |
| 1853 | iqc(3-jm)=10 !make the second output is gamma. |
| 1854 | |
| 1855 | else |
| 1856 | jt=12 !first parton=q(q~) |
| 1857 | nqc(1)=ncc(jq,3-jm) !here nqc(1) is gluon. |
| 1858 | njc1=ncc(1,jm) |
| 1859 | njc2=ncc(3-jq,3-jm) |
| 1860 | if(iqj(njc1).ne.0)then |
| 1861 | ncj(1,njc1)=njc2 |
| 1862 | else |
| 1863 | ncj(3-jq,njc1)=njc2 |
| 1864 | endif |
| 1865 | if(iqj(njc2).ne.0)then |
| 1866 | ncj(1,njc2)=njc1 |
| 1867 | else |
| 1868 | ncj(jq,njc2)=njc1 |
| 1869 | endif |
| 1870 | iqc(3-jm)=10 |
| 1871 | endif |
| 1872 | endif |
| 1873 | |
| 1874 | elseif(iqc(1)*iqc(2).gt.0)then |
| 1875 | jt=7 !qq->qq (q~q~->q~q~) |
| 1876 | if(iqc(1).gt.0)then |
| 1877 | jq=1 |
| 1878 | else |
| 1879 | jq=2 |
| 1880 | endif |
| 1881 | nqc(1)=ncc(1,3-jm) |
| 1882 | |
| 1883 | else ! qq~ -> |
| 1884 | if(iqc(jm).gt.0)then |
| 1885 | jq=1 |
| 1886 | else |
| 1887 | jq=2 |
| 1888 | endif |
| 1889 | aks=rangen() |
| 1890 | if(aks.lt.(wsub(1)+wsub(2))/fborn)then |
| 1891 | jt=8 ! qq~->qq~ (anticolor-color annihilation) |
| 1892 | if(aks.gt.wsub(1)/fborn)then |
| 1893 | iqa=iabs(iqc(jm)) |
| 1894 | iq=int((naflav-1)*rangen())+1 |
| 1895 | if(iq.eq.iqa)iq=naflav |
| 1896 | iqc(jm)=iq*iqc(jm)/iqa |
| 1897 | iqc(3-jm)=-iqc(jm) |
| 1898 | endif |
| 1899 | nqc(1)=0 |
| 1900 | njc1=ncc(1,jm) |
| 1901 | njc2=ncc(1,3-jm) |
| 1902 | if(iqj(njc1).ne.0)then |
| 1903 | ncj(1,njc1)=njc2 |
| 1904 | else |
| 1905 | ncj(3-jq,njc1)=njc2 |
| 1906 | endif |
| 1907 | if(iqj(njc2).ne.0)then |
| 1908 | ncj(1,njc2)=njc1 |
| 1909 | else |
| 1910 | ncj(jq,njc2)=njc1 |
| 1911 | endif |
| 1912 | elseif(aks.lt.(wsub(1)+wsub(2)+wsub(3))/fborn)then |
| 1913 | jt=10 !color transfer qq~->gg |
| 1914 | iqc(1)=0 |
| 1915 | iqc(2)=0 |
| 1916 | nqc(1)=ncc(1,jm) |
| 1917 | nqc(2)=0 |
| 1918 | elseif(aks.lt.(wsub(1)+wsub(2)+wsub(3)+wsub(4))/fborn)then |
| 1919 | jt=13 ! qq~->g+gamma |
| 1920 | nqc(1)=ncc(1,jm) |
| 1921 | nqc(2)=ncc(1,3-jm) |
| 1922 | iqc(jm)=0 |
| 1923 | iqc(3-jm)=10 |
| 1924 | else |
| 1925 | jt=14 ! qq~->gamma+gamma |
| 1926 | njc1=ncc(1,jm) |
| 1927 | njc2=ncc(1,3-jm) |
| 1928 | if(iqj(njc1).ne.0)then |
| 1929 | ncj(1,njc1)=njc2 |
| 1930 | else |
| 1931 | ncj(jq,njc1)=njc2 |
| 1932 | endif |
| 1933 | if(iqj(njc2).ne.0)then |
| 1934 | ncj(1,njc2)=njc1 |
| 1935 | else |
| 1936 | ncj(3-jq,njc2)=njc1 |
| 1937 | endif |
| 1938 | iqc(jm)=10 |
| 1939 | iqc(3-jm)=10 |
| 1940 | endif |
| 1941 | endif |
| 1942 | |
| 1943 | if(jt.ne.8.and.jt.ne.9)then |
| 1944 | jq2=jq |
| 1945 | else |
| 1946 | jq2=3-jq |
| 1947 | endif |
| 1948 | |
| 1949 | call psdeftr(si+q2mass,ept,ey) !lorentz boost to c.m. frame |
| 1950 | |
| 1951 | qt=sqrt(qt2) !p_t |
| 1952 | call pscs(bcos,bsin) !cos and sin of the polar angle |
| 1953 | if(iabs(iqc(1)).ne.4)then |
| 1954 | clight cone momentum share for the first parton |
| 1955 | z=sngl(psutz(dble(si),dble(qt2),dble(qt2))) |
| 1956 | if((jt.eq.11.and.jm.eq.1).or.(jt.eq.12.and.jm.eq.2) |
| 1957 | $ .or.(jt.eq.13.and.jm.eq.2))z=1-z |
| 1958 | wp3=z*sqrt(si) |
| 1959 | wm3=qt2/wp3 |
| 1960 | elseif(jm.eq.1)then |
| 1961 | z=sngl(psutz(dble(si),dble(qt2+q2mass),dble(qt2))) |
| 1962 | wp3=z*sqrt(si) |
| 1963 | wm3=(qt2+q2mass)/wp3 |
| 1964 | else |
| 1965 | z=sngl(psutz(dble(si),dble(qt2),dble(qt2+dble(q2mass)))) |
| 1966 | wp3=z*sqrt(si) |
| 1967 | wm3=qt2/wp3 |
| 1968 | endif |
| 1969 | ep3(1)=.5*(wp3+wm3) !parton 4-momentum |
| 1970 | ep3(2)=.5*(wp3-wm3) |
| 1971 | ep3(3)=qt*bcos |
| 1972 | ep3(4)=qt*bsin |
| 1973 | call psdefrot(ep3,s0xh,c0xh,s0h,c0h) !spacial rotation to z-axis |
| 1974 | if(iqc(jm).eq.0)then |
| 1975 | iq2ini1=9 |
| 1976 | else |
| 1977 | iq2ini1=iqc(jm) |
| 1978 | endif |
| 1979 | if(iqc(3-jm).eq.0)then |
| 1980 | iq2ini2=9 |
| 1981 | else |
| 1982 | iq2ini2=iqc(3-jm) |
| 1983 | endif |
| 1984 | if(jt.le.10)then |
| 1985 | qq1=qt2 |
| 1986 | qq2=qt2 |
| 1987 | elseif(jt.le.13)then |
| 1988 | qq1=qt2 |
| 1989 | qq2=0 |
| 1990 | else |
| 1991 | qq1=0 |
| 1992 | qq2=0 |
| 1993 | endif |
| 1994 | |
| 1995 | call timsh2(qq1,qq2,sqrt(si),iq2ini1,iq2ini2) !final state cascade |
| 1996 | |
| 1997 | if(jt.le.10)then !color connection for the 2nd parton |
| 1998 | if(ish.ge.6)write(ifch,*)'jt,jq,nqc:',jt,jq,nqc |
| 1999 | call psreti(nqc,jq,1,ey,s0xh,c0xh,s0h,c0h) !color conn. reconstruction |
| 2000 | if(jt.eq.1)then |
| 2001 | nqc(1)=nqc(2) |
| 2002 | nqc(2)=ncc(3-jq,3-jm) |
| 2003 | elseif(jt.eq.2)then |
| 2004 | nqc(2)=ncc(3-jq,jm) |
| 2005 | nqc(1)=ncc(jq,3-jm) |
| 2006 | elseif(jt.eq.3)then |
| 2007 | nqc(1)=nqc(2) |
| 2008 | elseif(jt.eq.4)then |
| 2009 | nqc(2)=nqc(1) |
| 2010 | nqc(1)=ncc(jq,3-jm) |
| 2011 | elseif(jt.eq.5)then |
| 2012 | nqc(1)=ncc(jq,jm) |
| 2013 | elseif(jt.eq.6)then |
| 2014 | nqc(2)=ncc(3-jq,3-jm) |
| 2015 | nqc(1)=ncc(1,jm) |
| 2016 | elseif(jt.eq.7)then |
| 2017 | nqc(1)=ncc(1,jm) |
| 2018 | elseif(jt.eq.9)then |
| 2019 | nqc(1)=ncc(3-jq,3-jm) |
| 2020 | elseif(jt.eq.10)then |
| 2021 | nqc(1)=nqc(2) |
| 2022 | nqc(2)=ncc(1,3-jm) |
| 2023 | endif |
| 2024 | if(ish.ge.6)write(ifch,*)'jt,jq2,nqc:',jt,jq2,nqc |
| 2025 | call psreti(nqc,jq2,2,ey,s0xh,c0xh,s0h,c0h) !color conn. reconstr. |
| 2026 | elseif(jt.le.13)then |
| 2027 | if(ish.ge.6)write(ifch,*)'jt,jq,nqc:',jt,jq,nqc |
| 2028 | call psreti(nqc,jq,1,ey,s0xh,c0xh,s0h,c0h) !color conn. reconstruction |
| 2029 | ep3(1)=pprt(4,2) |
| 2030 | ep3(2)=pprt(3,2) |
| 2031 | ep3(3)=pprt(1,2) |
| 2032 | ep3(4)=pprt(2,2) |
| 2033 | call psrotat(ep3,s0xh,c0xh,s0h,c0h) !special rotation for photon. |
| 2034 | call pstrans(ep3,ey,1) |
| 2035 | nptl=nptl+1 |
| 2036 | pptl(1,nptl)=ep3(3) |
| 2037 | pptl(2,nptl)=ep3(4) |
| 2038 | pptl(3,nptl)=ep3(2) |
| 2039 | pptl(4,nptl)=ep3(1) |
| 2040 | pptl(5,nptl)=0 |
| 2041 | idptl(nptl)=10 |
| 2042 | iorptl(nptl)=iptl |
| 2043 | istptl(nptl)=0 |
| 2044 | jorptl(nptl)=0 |
| 2045 | do i=1,4 |
| 2046 | xorptl(i,nptl)=coordo(i) |
| 2047 | enddo |
| 2048 | tivptl(1,nptl)=coordo(5) |
| 2049 | tivptl(2,nptl)=coordo(6) |
| 2050 | ityptl(nptl)=71 |
| 2051 | ifrptl(1,nptl)=0 |
| 2052 | ifrptl(2,nptl)=0 |
| 2053 | else |
| 2054 | do j=1,2 |
| 2055 | ep3(1)=pprt(4,j) |
| 2056 | ep3(2)=pprt(3,j) |
| 2057 | ep3(3)=pprt(1,j) |
| 2058 | ep3(4)=pprt(2,j) |
| 2059 | call psrotat(ep3,s0xh,c0xh,s0h,c0h) !special rotation for photon. |
| 2060 | call pstrans(ep3,ey,1) |
| 2061 | nptl=nptl+1 |
| 2062 | pptl(1,nptl)=ep3(3) |
| 2063 | pptl(2,nptl)=ep3(4) |
| 2064 | pptl(3,nptl)=ep3(2) |
| 2065 | pptl(4,nptl)=ep3(1) |
| 2066 | pptl(5,nptl)=0 |
| 2067 | idptl(nptl)=10 |
| 2068 | iorptl(nptl)=iptl |
| 2069 | istptl(nptl)=0 |
| 2070 | jorptl(nptl)=0 |
| 2071 | do i=1,4 |
| 2072 | xorptl(i,nptl)=coordo(i) |
| 2073 | enddo |
| 2074 | tivptl(1,nptl)=coordo(5) |
| 2075 | tivptl(2,nptl)=coordo(6) |
| 2076 | ityptl(nptl)=72 |
| 2077 | ifrptl(1,nptl)=0 |
| 2078 | ifrptl(2,nptl)=0 |
| 2079 | enddo |
| 2080 | endif |
| 2081 | call utprix('psabor',ish,ishini,5) |
| 2082 | return |
| 2083 | end |
| 2084 | |
| 2085 | c------------------------------------------------------------------------ |
| 2086 | subroutine psreti(nqc,jort,nfprt,ey,s0xh,c0xh,s0h,c0h) |
| 2087 | c----------------------------------------------------------------------- |
| 2088 | c jet reconstructuring procedure - 4-momenta for all final jets |
| 2089 | c nqc(i) - colour connections for the jet |
| 2090 | c jort - color orientation for gluons (=1 if +color goes first, =-1 otherwise) |
| 2091 | |
| 2092 | parameter (ntim=1000) |
| 2093 | common/cprt/nprtj,pprt(5,ntim),idprt(ntim),iorprt(ntim) |
| 2094 | &,idaprt(2,ntim) |
| 2095 | c nprtj - number of partons in the jet (including virtual ones) |
| 2096 | c pprt - 5-momenta for the partons |
| 2097 | c idprt - parton id |
| 2098 | c iorprt - parent parton position in the list |
| 2099 | c idaprt - daughter partons positions in the list |
| 2100 | |
| 2101 | c output: |
| 2102 | parameter (mjstr=20000) |
| 2103 | common /psar29/ eqj(4,mjstr),iqj(mjstr),ncj(2,mjstr),nj |
| 2104 | c nj - number of final jets |
| 2105 | c eqj(i,j) - 4-momentum for the final jet j |
| 2106 | c iqj(j) - flavour for the final jet j |
| 2107 | c ncj(m,j) - colour connections for the final jet j |
| 2108 | c----------------------------------------------------------------------- |
| 2109 | dimension ep3(4),nqc(2),ncc(2,ntim),ey(3) |
| 2110 | include 'epos.inc' |
| 2111 | include 'epos.incsem' |
| 2112 | common/cprtx/nprtjx,pprtx(5,2) |
| 2113 | |
| 2114 | if(ish.ge.6)then |
| 2115 | write (ifch,*)'nprtj',nprtj |
| 2116 | do i=1,nprtj |
| 2117 | write (ifch,*)'i,ic,np,ndd',i,idprt(i),iorprt(i), |
| 2118 | * idaprt(1,i),idaprt(2,i) |
| 2119 | enddo |
| 2120 | endif |
| 2121 | |
| 2122 | ncc(1,nfprt)=nqc(1) |
| 2123 | if(idprt(nfprt).eq.9)ncc(2,nfprt)=nqc(2) |
| 2124 | iprt=nfprt |
| 2125 | |
| 2126 | if(nprtjx.eq.2)then !out Born before timelike cascade |
| 2127 | ep3(1)=pprtx(4,iprt) |
| 2128 | ep3(2)=pprtx(3,iprt) |
| 2129 | ep3(3)=pprtx(1,iprt) |
| 2130 | ep3(4)=pprtx(2,iprt) |
| 2131 | call psrotat(ep3,s0xh,c0xh,s0h,c0h) |
| 2132 | call pstrans(ep3,ey,1) |
| 2133 | pprtx(4,iprt)=ep3(1) |
| 2134 | pprtx(3,iprt)=ep3(2) |
| 2135 | pprtx(1,iprt)=ep3(3) |
| 2136 | pprtx(2,iprt)=ep3(4) |
| 2137 | endif |
| 2138 | |
| 2139 | 1 continue |
| 2140 | |
| 2141 | idau1=idaprt(1,iprt) |
| 2142 | idau2=idaprt(2,iprt) |
| 2143 | icp=idprt(iprt) |
| 2144 | |
| 2145 | if(ish.ge.6)then |
| 2146 | write (ifch,*)'1-iprt,icp,idau1,idau2',iprt,icp,idau1,idau2, |
| 2147 | * ncc(1,iprt) |
| 2148 | if(icp.eq.9)write (ifch,*)'ncc2',ncc(2,iprt) |
| 2149 | endif |
| 2150 | |
| 2151 | if(idau1.ne.0.)then !virtual parton |
| 2152 | icd1=idprt(idau1) |
| 2153 | |
| 2154 | if(icp.eq.9)then |
| 2155 | if(icd1.ne.9)then !g -> qq~ |
| 2156 | ncc(1,idau1)=ncc(jort,iprt) |
| 2157 | ncc(1,idau2)=ncc(3-jort,iprt) |
| 2158 | else !g -> gg |
| 2159 | ncc(1,idau1)=ncc(1,iprt) |
| 2160 | ncc(2,idau1)=0 |
| 2161 | ncc(2,idau2)=ncc(2,iprt) |
| 2162 | ncc(1,idau2)=0 |
| 2163 | endif |
| 2164 | else !q -> qg |
| 2165 | ncc(1,idau1)=0 |
| 2166 | if(icp*(3-2*jort).gt.0)then |
| 2167 | ncc(1,idau2)=ncc(1,iprt) |
| 2168 | ncc(2,idau2)=0 |
| 2169 | else |
| 2170 | ncc(1,idau2)=0 |
| 2171 | ncc(2,idau2)=ncc(1,iprt) |
| 2172 | endif |
| 2173 | endif |
| 2174 | iprt=idau1 |
| 2175 | goto 1 |
| 2176 | else |
| 2177 | |
| 2178 | nj=nj+1 |
| 2179 | ep3(1)=pprt(4,iprt) |
| 2180 | ep3(2)=pprt(3,iprt) |
| 2181 | ep3(3)=pprt(1,iprt) |
| 2182 | ep3(4)=pprt(2,iprt) |
| 2183 | call psrotat(ep3,s0xh,c0xh,s0h,c0h) |
| 2184 | call pstrans(ep3,ey,1) |
| 2185 | do i=1,4 |
| 2186 | eqj(i,nj)=ep3(i) |
| 2187 | enddo |
| 2188 | |
| 2189 | if(icp.eq.9)then |
| 2190 | iqj(nj)=0 |
| 2191 | elseif(iabs(icp).lt.3)then |
| 2192 | iqj(nj)=icp |
| 2193 | elseif(iabs(icp).eq.3)then |
| 2194 | iqj(nj)=icp*4/3 |
| 2195 | else |
| 2196 | iqj(nj)=icp*10 |
| 2197 | endif |
| 2198 | |
| 2199 | if(iqj(nj).ne.0)then |
| 2200 | njc=ncc(1,iprt) |
| 2201 | if(njc.ne.0)then |
| 2202 | ncj(1,nj)=njc |
| 2203 | iqc=iqj(njc) |
| 2204 | if(iqc.ne.0)then |
| 2205 | ncj(1,njc)=nj |
| 2206 | else |
| 2207 | if(iqj(nj).gt.0)then |
| 2208 | ncj(2,njc)=nj |
| 2209 | else |
| 2210 | ncj(1,njc)=nj |
| 2211 | endif |
| 2212 | endif |
| 2213 | else |
| 2214 | ncc(1,iprt)=nj |
| 2215 | endif |
| 2216 | else |
| 2217 | |
| 2218 | do m=1,2 |
| 2219 | if(jort.eq.1)then |
| 2220 | m1=m |
| 2221 | else |
| 2222 | m1=3-m |
| 2223 | endif |
| 2224 | njc=ncc(m1,iprt) |
| 2225 | if(njc.ne.0)then |
| 2226 | ncj(m,nj)=njc |
| 2227 | iqc=iqj(njc) |
| 2228 | if(iqc.ne.0)then |
| 2229 | ncj(1,njc)=nj |
| 2230 | else |
| 2231 | ncj(3-m,njc)=nj |
| 2232 | endif |
| 2233 | else |
| 2234 | ncc(m1,iprt)=nj |
| 2235 | endif |
| 2236 | enddo |
| 2237 | endif |
| 2238 | if(ish.ge.6)then |
| 2239 | write (ifch,*)'jet-nj,iprt,icp,iqj(nj),ncj', |
| 2240 | * nj,iprt,icp,iqj(nj),ncj(1,nj) |
| 2241 | if(icp.eq.9)write (ifch,*)'ncj2',ncj(2,nj) |
| 2242 | endif |
| 2243 | endif |
| 2244 | |
| 2245 | 2 continue |
| 2246 | if(iprt.ne.nfprt)then |
| 2247 | icp=idprt(iprt) |
| 2248 | ipar=iorprt(iprt) |
| 2249 | idau1=idaprt(1,ipar) |
| 2250 | idau2=idaprt(2,ipar) |
| 2251 | if(ish.ge.6)then |
| 2252 | write (ifch,*)'2-iprt,icp,idau1,idau2,ipar', |
| 2253 | * iprt,icp,idau1,idau2,ipar,ncc(1,iprt) |
| 2254 | if(icp.eq.9)write (ifch,*)ncc(2,iprt) |
| 2255 | endif |
| 2256 | |
| 2257 | if(idau1.eq.iprt)then |
| 2258 | if(icp.eq.9)then !g -> gg |
| 2259 | ncc(1,ipar)=ncc(1,iprt) |
| 2260 | ncc(1,idau2)=ncc(2,iprt) |
| 2261 | else |
| 2262 | icpar=idprt(ipar) |
| 2263 | if(icpar.eq.9)then !g -> qq~ |
| 2264 | ncc(jort,ipar)=ncc(1,iprt) |
| 2265 | else !q -> qg |
| 2266 | if(icp*(3-2*jort).gt.0)then |
| 2267 | ncc(2,idau2)=ncc(1,iprt) |
| 2268 | else |
| 2269 | ncc(1,idau2)=ncc(1,iprt) |
| 2270 | endif |
| 2271 | endif |
| 2272 | endif |
| 2273 | iprt=idau2 |
| 2274 | goto 1 |
| 2275 | |
| 2276 | else |
| 2277 | if(icp.eq.9)then |
| 2278 | icpar=idprt(ipar) |
| 2279 | if(icpar.eq.9)then !g -> gg |
| 2280 | ncc(2,ipar)=ncc(2,iprt) |
| 2281 | ncc(2,idau1)=ncc(1,iprt) |
| 2282 | else !q -> qg |
| 2283 | if(icpar*(3-2*jort).gt.0)then |
| 2284 | ncc(1,ipar)=ncc(1,iprt) |
| 2285 | ncc(1,idau1)=ncc(2,iprt) |
| 2286 | else |
| 2287 | ncc(1,ipar)=ncc(2,iprt) |
| 2288 | ncc(1,idau1)=ncc(1,iprt) |
| 2289 | endif |
| 2290 | endif |
| 2291 | else |
| 2292 | ncc(3-jort,ipar)=ncc(1,iprt) |
| 2293 | endif |
| 2294 | iprt=ipar |
| 2295 | goto 2 |
| 2296 | endif |
| 2297 | else |
| 2298 | if(ish.ge.6)write (ifch,*)'3-iprt,ncc',iprt,ncc(1,iprt) |
| 2299 | nqc(1)=ncc(1,nfprt) |
| 2300 | if(idprt(nfprt).eq.9)nqc(2)=ncc(2,nfprt) |
| 2301 | endif |
| 2302 | return |
| 2303 | end |
| 2304 | |
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