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Commit | Line | Data |
---|---|---|
9ef1c2d9 | 1 | c reshuffled from sem, sto, sha |
2 | ||
3 | c contains DIS, and unused 3P stuff | |
4 | c --- --------------- | |
5 | ||
6 | ||
7 | ||
8 | ||
9 | c########################################################################### | |
10 | c########################################################################### | |
11 | c########################################################################### | |
12 | c########################################################################### | |
13 | c | |
14 | c DIS | |
15 | c | |
16 | c########################################################################### | |
17 | c########################################################################### | |
18 | c########################################################################### | |
19 | c########################################################################### | |
20 | ||
21 | ||
22 | ||
23 | ||
24 | ||
25 | ||
26 | ||
27 | ||
28 | ||
29 | ||
30 | c----------------------------------------------------------------------- | |
31 | subroutine lepexp(rxbj,rqsq) | |
32 | c----------------------------------------------------------------------- | |
33 | c generates x_bjorken and q**2 according to an experimental | |
34 | c distribution ( given in array xq(nxbj,nqsq) ). | |
35 | c----------------------------------------------------------------------- | |
36 | parameter (nxbj=10,nqsq=10) | |
37 | parameter (xbjmin=0.,qsqmin=4.) | |
38 | parameter (xbjwid=0.025, qsqwid=4.) | |
39 | dimension xq(nxbj,nqsq),vxq(nxbj*nqsq) | |
40 | equivalence (xq(1,1),vxq(1)) | |
41 | ||
42 | data (vxq(i),i=1,50)/ | |
43 | & 1304.02, 366.40, 19.84, 10.79, 6.42, | |
44 | & 4.54, 4.15, 3.38, 2.03, 1.56, | |
45 | & 241.63, 1637.26, 427.36, 164.51, 73.72, | |
46 | & 43.07, 20.73, 12.78, 9.34, 5.83, | |
47 | & 0.01, 724.66, 563.79, 275.08, 176.13, | |
48 | & 106.44, 85.82, 54.52, 37.12, 28.65, | |
49 | & 0.01, 202.40, 491.10, 245.13, 157.07, | |
50 | & 104.43, 61.05, 49.42, 37.84, 26.79, | |
51 | & 0.01, 3.77, 316.38, 226.92, 133.45, | |
52 | & 90.30, 63.67, 48.42, 35.73, 28.04/ | |
53 | data (vxq(i),i=51,100)/ | |
54 | & 0.01, 0.01, 153.74, 213.09, 114.14, | |
55 | & 76.26, 60.02, 43.15, 43.47, 25.60, | |
56 | & 0.01, 0.01, 39.31, 185.74, 108.56, | |
57 | & 88.40, 47.29, 39.35, 31.80, 22.91, | |
58 | & 0.01, 0.01, 0.01, 104.61, 107.01, | |
59 | & 66.24, 45.34, 37.45, 33.44, 23.78, | |
60 | & 0.01, 0.01, 0.01, 56.58, 99.39, | |
61 | & 67.78, 43.28, 35.98, 34.63, 18.31, | |
62 | & 0.01, 0.01, 0.01, 13.56, 76.25, | |
63 | & 64.30, 42.80, 28.56, 21.19, 20.75 / | |
64 | ||
65 | data init/0/ | |
66 | init=init+1 | |
67 | if(init.eq.1) then | |
68 | n=nxbj*nqsq | |
69 | sum=0. | |
70 | do 1 i=1,n | |
71 | sum=sum+vxq(i) | |
72 | 1 continue | |
73 | do 2 i=2,n | |
74 | 2 vxq(i)=vxq(i)+vxq(i-1) | |
75 | do 3 i=1,n | |
76 | 3 vxq(i)=vxq(i)/sum | |
77 | endif | |
78 | ||
79 | n=nxbj*nqsq | |
80 | r=rangen() | |
81 | call utloc(vxq,n,r,iloc) | |
82 | if(iloc.ge.n) iloc=iloc-1 | |
83 | i=mod(iloc,nxbj)+1 | |
84 | if(i.eq.0) i=nxbj | |
85 | j=iloc/nxbj + 1 | |
86 | dxint=vxq(1) | |
87 | if(iloc.gt.0) dxint=vxq(iloc+1)-vxq(iloc) | |
88 | dxbj=xbjwid*abs(r-vxq(iloc+1))/dxint | |
89 | dy=qsqwid*rangen() | |
90 | rxbj=xbjmin+xbjwid*float(i-1)+dxbj | |
91 | rqsq=qsqmin+qsqwid*float(j-1)+dy | |
92 | return | |
93 | end | |
94 | ||
95 | c----------------------------------------------------------------------- | |
96 | subroutine fremny(wp1,wm1,pnx,pny,sm,ic1,ic2,ic3,ic4,coord,ey0) | |
97 | c----------------------------------------------------------------------- | |
98 | c treats remnant from deep inelastic process; | |
99 | c----------------------------------------------------------------------- | |
100 | include 'epos.inc' | |
101 | include 'epos.incsem' | |
102 | dimension coord(6),ic(2),ep(4),ey(3),ey0(3),ep3(4) | |
103 | double precision ept(4),ept1(4) | |
104 | ||
105 | call utpri('fremny',ish,ishini,5) | |
106 | if(ish.ge.5)write(ifch,*)'writing remnant' | |
107 | if(ish.ge.5)write(ifch,*) | |
108 | *'wp1,wm1,pnx,pny,sm,ic1,ic2,ic3,ic4,coord,ey0:' | |
109 | if(ish.ge.5)write(ifch,*) | |
110 | *wp1,wm1,pnx,pny,sm,ic1,ic2,ic3,ic4,coord,ey0 | |
111 | ||
112 | if(ic3.eq.0.and.ic4.eq.0)then | |
113 | ||
114 | ic(1)=ic1 | |
115 | ic(2)=ic2 | |
116 | nptl=nptl+1 | |
117 | ep3(3)=pnx | |
118 | ep3(4)=pny | |
119 | ep3(2)=(wp1-wm1)/2 | |
120 | ep3(1)=(wp1+wm1)/2 | |
121 | call pstrans(ep3,ey0,-1) | |
122 | pptl(1,nptl)=ep3(3) | |
123 | pptl(2,nptl)=ep3(4) | |
124 | pptl(3,nptl)=ep3(2) | |
125 | pptl(4,nptl)=ep3(1) | |
126 | pptl(5,nptl)=sqrt(sm) | |
127 | idptl(nptl)=idtra(ic,0,0,3) | |
128 | iorptl(nptl)=1 | |
129 | istptl(nptl)=0 | |
130 | jorptl(nptl)=0 | |
131 | do i=1,4 | |
132 | xorptl(i,nptl)=coord(i) | |
133 | enddo | |
134 | tivptl(1,nptl)=coord(5) | |
135 | tivptl(2,nptl)=coord(6) | |
136 | ityptl(nptl)=40 | |
137 | ||
138 | if(ish.ge.7)then | |
139 | write(ifch,*)'proj: nptl, mass**2,id',nptl,sm,idptl(nptl) | |
140 | write(ifch,*)'ept', | |
141 | *pptl(1,nptl),pptl(2,nptl),pptl(3,nptl),pptl(4,nptl) | |
142 | endif | |
143 | ||
144 | else | |
145 | ||
146 | ic(1)=ic1 | |
147 | ic(2)=ic2 | |
148 | nptl=nptl+1 | |
149 | idptl(nptl)=idtra(ic,0,0,3) | |
150 | istptl(nptl)=20 | |
151 | iorptl(nptl)=1 | |
152 | jorptl(nptl)=0 | |
153 | do i=1,4 | |
154 | xorptl(i,nptl)=coord(i) | |
155 | enddo | |
156 | tivptl(1,nptl)=coord(5) | |
157 | tivptl(2,nptl)=coord(6) | |
158 | ityptl(nptl)=40 | |
159 | ||
160 | ic(1)=ic3 | |
161 | ic(2)=ic4 | |
162 | idptl(nptl+1)=idtra(ic,0,0,3) | |
163 | istptl(nptl+1)=20 | |
164 | iorptl(nptl+1)=1 | |
165 | jorptl(nptl+1)=0 | |
166 | do i=1,4 | |
167 | xorptl(i,nptl+1)=coord(i) | |
168 | enddo | |
169 | tivptl(1,nptl+1)=coord(5) | |
170 | tivptl(2,nptl+1)=coord(6) | |
171 | ityptl(nptl+1)=40 | |
172 | ||
173 | ep3(3)=pnx | |
174 | ep3(4)=pny | |
175 | ep3(2)=(wp1-wm1)/2 | |
176 | ep3(1)=(wp1+wm1)/2 | |
177 | call pstrans(ep3,ey0,-1) !boost to hadronic c.m.s. | |
178 | ept(1)=ep3(3) | |
179 | ept(2)=ep3(4) | |
180 | ept(3)=ep3(2) | |
181 | ept(4)=ep3(1) | |
182 | do i=1,4 | |
183 | ept1(i)=ep3(i) | |
184 | enddo | |
185 | ||
186 | sww=sqrt(sm) | |
187 | call psdeftr(sm,ept1,ey) | |
188 | ep(1)=.5*sww | |
189 | ep(2)=.5*sww | |
190 | ep(3)=0. | |
191 | ep(4)=0. | |
192 | call pstrans(ep,ey,1) | |
193 | pptl(1,nptl)=ep(3) | |
194 | pptl(2,nptl)=ep(4) | |
195 | pptl(3,nptl)=ep(2) | |
196 | pptl(4,nptl)=ep(1) | |
197 | do i=1,4 | |
198 | pptl(i,nptl+1)=ept(i)-pptl(i,nptl) | |
199 | enddo | |
200 | nptl=nptl+1 | |
201 | endif | |
202 | ||
203 | 1000 continue | |
204 | if(ish.ge.5)write(ifch,*)'fremny: final nptl',nptl | |
205 | call utprix('fremny',ish,ishini,5) | |
206 | return | |
207 | end | |
208 | ||
209 | c----------------------------------------------------------------------- | |
210 | subroutine psadis(iret) | |
211 | c----------------------------------------------------------------------- | |
212 | c psadis - DIS interaction | |
213 | c----------------------------------------------------------------------- | |
214 | double precision ept(4),ept1(4),xx,wpt(2),eprt,pl,plprt,psutz | |
215 | *,psuds | |
216 | dimension ep3(4),ey(3),ey0(3),bx(6), | |
217 | *qmin(2),iqc(2),nqc(2),ncc(2,2),gdv(2),gds(2),dfp(4) | |
218 | parameter (mjstr=20000) | |
219 | common /psar29/ eqj(4,mjstr),iqj(mjstr),ncj(2,mjstr),nj | |
220 | common /psar30/ iorj(mjstr),ityj(mjstr),bxj(6,mjstr) | |
221 | double precision pgampr,rgampr | |
222 | common/cgampr/pgampr(5),rgampr(4) | |
223 | parameter (ntim=1000) | |
224 | common/cprt/nprtj,pprt(5,ntim),idprt(ntim),iorprt(ntim) | |
225 | &,idaprt(2,ntim) | |
226 | common/ciptl/iptl | |
227 | include 'epos.inc' | |
228 | include 'epos.incsem' | |
229 | ||
230 | call utpri('psadis',ish,ishini,3) | |
231 | if(ish.ge.3)write (ifch,*)'engy,elepti,iolept:' | |
232 | if(ish.ge.3)write (ifch,*)engy,elepti,iolept | |
233 | nptl=nptl+1 | |
234 | idptl(nptl)=1220 | |
235 | istptl(nptl)=1 | |
236 | nptlh=nptl | |
237 | iptl=nptl | |
238 | s00=1. | |
239 | ||
240 | pptl(1,nptl)=0. | |
241 | pptl(2,nptl)=0. | |
242 | pptl(3,nptl)=-engy/2 | |
243 | pptl(4,nptl)=engy/2 | |
244 | pptl(5,nptl)=0 | |
245 | ||
246 | 1 continue | |
247 | if(iolept.eq.1)then | |
248 | wtot=engy**2 | |
249 | engypr=wtot/4./elepti | |
250 | gdv01=psdh(ydmax*wtot,qdmin,iclpro,0) | |
251 | gdv02=psdh(ydmax*wtot,qdmin,iclpro,1) | |
252 | gds01=psdsh(ydmax*wtot,qdmin,iclpro,dqsh,0) | |
253 | gds02=psdsh(ydmax*wtot,qdmin,iclpro,dqsh1,1) | |
254 | gb0=(1.+(1.-ydmax)**2)*(gdv01+gds01) | |
255 | * +2.*(1.-ydmax)*(gdv02+gds02) | |
256 | ||
257 | 2 continue | |
258 | qq=qdmin*(qdmax/qdmin)**rangen() | |
259 | yd=ydmin*(ydmax/ydmin)**rangen() | |
260 | wd=yd*wtot | |
261 | if(ish.ge.4)write (ifch,*)'qq,wd,yd,ydmin,ydmax:' | |
262 | if(ish.ge.4)write (ifch,*)qq,wd,yd,ydmin,ydmax | |
263 | if(wd.lt.qq)goto 2 | |
264 | ||
265 | gdv(1)=psdh(wd,qq,iclpro,0) | |
266 | gdv(2)=psdh(wd,qq,iclpro,1) | |
267 | gds(1)=psdsh(wd,qq,iclpro,dqsh,0) | |
268 | gds(2)=psdsh(wd,qq,iclpro,dqsh1,1) | |
269 | gbtr=(1.+(1.-yd)**2)*(gdv(1)+gds(1)) | |
270 | gblong=2.*(1.-yd)*(gdv(2)+gds(2)) | |
271 | c gblong=0. !??????? | |
272 | gb=(gbtr+gblong)/gb0*.7 | |
273 | if(ish.ge.4)then | |
274 | if(gb.gt.1.)write(ifmt,*)'gb,qq,yd,wd',gb,qq,yd,wd | |
275 | write (ifch,*)'gb,gdv,gds,gdv0,gds0,yd:' | |
276 | write (ifch,*)gb,gdv,gds,gdv01,gds01, | |
277 | * gdv02,gds02,yd | |
278 | endif | |
279 | if(rangen().gt.gb)goto 2 | |
280 | ||
281 | long=int(rangen()+gblong/(gbtr+gblong)) | |
282 | elepto=qq/elepti/4.+elepti*(1.-yd) | |
283 | costhet=1.-qq/elepti/elepto/2. | |
284 | theta=acos(costhet) | |
285 | if(theta/pi*180..lt.themin)goto 2 | |
286 | if(theta/pi*180..gt.themax)goto 2 | |
287 | if(elepto.lt.elomin)goto 2 | |
288 | if(ish.ge.3)write (ifch,*)'theta,elepto,elepti,iclpro:' | |
289 | if(ish.ge.3)write (ifch,*)theta/pi*180.,elepto,elepti,iclpro | |
290 | xbjevt=qq/wd | |
291 | qsqevt=qq | |
292 | ||
293 | call pscs(bcos,bsin) | |
294 | rgampr(1)=-elepto*sin(theta)*bcos | |
295 | rgampr(2)=-elepto*sin(theta)*bsin | |
296 | rgampr(3)=elepti-elepto*costhet | |
297 | rgampr(4)=elepti-elepto | |
298 | ||
299 | pgampr(1)=rgampr(1) | |
300 | pgampr(2)=rgampr(2) | |
301 | pgampr(3)=rgampr(3)-engypr | |
302 | pgampr(4)=rgampr(4)+engypr | |
303 | sm2=pgampr(4)*pgampr(4) | |
304 | * -pgampr(1)*pgampr(1)-pgampr(2)*pgampr(2)-pgampr(3)*pgampr(3) | |
305 | pgampr(5)=sqrt(sm2) | |
306 | call utlob2(1,pgampr(1),pgampr(2),pgampr(3),pgampr(4),pgampr(5) | |
307 | * ,rgampr(1),rgampr(2),rgampr(3),rgampr(4),40) | |
308 | if(ish.ge.4)write (ifch,*)'rgampr:',rgampr | |
309 | ||
310 | elseif(iolept.lt.0)then | |
311 | 21 call lepexp(xbjevt,qsq) | |
312 | qq=qsq | |
313 | wd=qq/xbjevt | |
314 | if(qq.lt.qdmin.or.qq.gt.qdmax)goto21 | |
315 | ||
316 | gdv(1)=psdh(wd,qq,iclpro,0) | |
317 | gdv(2)=psdh(wd,qq,iclpro,1) | |
318 | gds(1)=psdsh(wd,qq,iclpro,dqsh,0) | |
319 | gds(2)=psdsh(wd,qq,iclpro,dqsh1,1) | |
320 | yd=wd/engy**2 | |
321 | gbtr=(1.+(1.-yd)**2)*(gdv(1)+gds(1)) | |
322 | gblong=2.*(1.-yd)*(gdv(2)+gds(2)) | |
323 | gblong=0. !???????????? | |
324 | long=int(rangen()+gblong/(gbtr+gblong)) | |
325 | else | |
326 | stop'wrong iolept' | |
327 | endif | |
328 | if(ish.ge.3)write (ifch,*)'qq,xbj,wd,gdv,gds,dqsh:' | |
329 | if(ish.ge.3)write (ifch,*)qq,xbjevt,wd,gdv,gds,dqsh | |
330 | ||
331 | egyevt=sqrt(wd-qq) | |
332 | pmxevt=.5*egyevt | |
333 | ||
334 | wp0=sqrt(qq) !breit frame | |
335 | wm0=(wd-qq)/wp0 | |
336 | ey0(1)=egyevt/wp0 !boost to the hadronic c.m.s. | |
337 | ey0(2)=1. | |
338 | ey0(3)=1. | |
339 | do i=1,6 | |
340 | bx(i)=0. | |
341 | enddo | |
342 | ||
343 | if(long.eq.0)then | |
344 | sdmin=qq/(1.-sqrt(q2ini/qq)) | |
345 | sqmin=sdmin | |
346 | else | |
347 | sdmin=4.*max(q2min,qcmass**2)+qq !minimal mass for born | |
348 | xmm=(5.*sdmin-qq)/4. | |
349 | sqmin=1.1*(xmm+sqrt(xmm**2-qq*(sdmin-qq-4.*q2ini))) | |
350 | * /2./(1.-4.*q2ini/(sdmin-qq)) | |
351 | endif | |
352 | if(long.eq.1.and.wd.lt.1.001*sdmin)goto 1 | |
353 | ||
354 | proja=210000. | |
355 | projb=0. | |
356 | call fremnu(ammin,proja,projb,proja,projb, | |
357 | *icp1,icp2,icp3,icp4) | |
358 | ||
359 | nj=0 | |
360 | ||
361 | if((rangen().lt.gdv(long+1)/(gdv(long+1)+gds(long+1)).or. | |
362 | *egyevt.lt.1.0001*(ammin+sqrt(sdmin-qq))).and. | |
363 | *(long.eq.0.or.wd.gt.sqmin))then | |
364 | if(long.eq.0)then | |
365 | xd=qq/wd | |
366 | tu=psdfh4(xd,q2min,0.,iclpro,1)/2.25 | |
367 | td=psdfh4(xd,q2min,0.,iclpro,2)/9. | |
368 | gdv0=(tu+td)*4.*pi**2*alfe/qq | |
369 | * *sngl(psuds(qq,1)/psuds(q2min,1)) | |
370 | if(ish.ge.4)write (ifch,*)'gdv0:',gdv0,sdmin | |
371 | ||
372 | if(rangen().lt.gdv0/gdv(1).or.wd.le.1.0001*sdmin)then !????? | |
373 | if(ish.ge.3)write (ifch,*)'no cascade,gdv0,gdv',gdv0,gdv | |
374 | if(rangen().lt.tu/(tu+td))then | |
375 | iq1=1 | |
376 | izh=3 | |
377 | else | |
378 | iq1=2 | |
379 | izh=6 | |
380 | endif | |
381 | jq=1 | |
382 | if(ish.ge.8)write (ifch,*)'before call timsh2: ', | |
383 | * 'qq,egyevt,iq1',qq,egyevt,iq1 | |
384 | call timsh2(qq,0.,egyevt,iq1,-iq1) | |
385 | ||
386 | nj=nj+1 | |
387 | iqj(nj)=izh | |
388 | nqc(1)=nj | |
389 | nqc(2)=0 | |
390 | ||
391 | ep3(1)=pprt(4,2) | |
392 | ep3(2)=pprt(3,2) | |
393 | ep3(3)=0. | |
394 | ep3(4)=0. | |
395 | call pstrans(ep3,ey0,1) | |
396 | do i=1,4 | |
397 | eqj(i,nj)=ep3(i) | |
398 | enddo | |
399 | s0h=0. | |
400 | c0h=1. | |
401 | s0xh=0. | |
402 | c0xh=1. | |
403 | call psreti(nqc,jq,1,ey0,s0xh,c0xh,s0h,c0h) | |
404 | goto 17 | |
405 | endif | |
406 | endif | |
407 | ||
408 | call psdint(wd,qq,sds0,sdn0,sdb0,sdt0,sdr0,1,long) | |
409 | if(ish.ge.3)write (ifch,*)'wd,qq,sds0,sdn0,sdb0,sdt0,sdr0:' | |
410 | if(ish.ge.3)write (ifch,*)wd,qq,sds0,sdn0,sdb0,sdt0 | |
411 | gb10=(sdn0+sdt0)*(1.-qq/wd) | |
412 | xdmin=sqmin/wd | |
413 | ||
414 | 3 continue | |
415 | xd=(xdmin-qq/wd)/((xdmin-qq/wd)/(1.-qq/wd)) | |
416 | * **rangen()+qq/wd | |
417 | call psdint(xd*wd,qq,sds,sdn,sdb,sdt,sdr,1,long) | |
418 | if(ish.ge.3)write (ifch,*)'wdhard,qq,sds,sdn,sdb,sdt:' | |
419 | if(ish.ge.3)write (ifch,*)xd*wd,qq,sds,sdn,sdb,sdt | |
420 | tu=psdfh4(xd,q2min,0.,iclpro,1) | |
421 | td=psdfh4(xd,q2min,0.,iclpro,2) | |
422 | gb1=(sdn*(tu/2.25+td/9.)+sdt*(tu+td)/4.5) | |
423 | * *(1.-qq/wd/xd)/gb10 | |
424 | if(gb1.gt.1..and.ish.ge.1)write(ifmt,*)'gb1,xd,wd,qq,sdt0,sdt', | |
425 | * gb1,xd,wd,qq,sdt0,sdt | |
426 | if(ish.ge.6)write (ifch,*)'gb1,xd,wd,qq,sdt0,sdt:' | |
427 | if(ish.ge.6)write (ifch,*)gb1,xd,wd,qq,sdt0,sdt | |
428 | if(rangen().gt.gb1)goto 3 | |
429 | ||
430 | gdres=(sdt-sds)/4.5 | |
431 | gdrga=sdr/4.5 | |
432 | gdsin=sds/4.5 | |
433 | dtu=tu*(sdn/2.25+sdt/4.5) | |
434 | dtd=td*(sdn/9.+sdt/4.5) | |
435 | if(rangen().lt.dtu/(dtu+dtd))then | |
436 | iq1=1 | |
437 | izh=3 | |
438 | gdbor=sdb/2.25 | |
439 | gdnon=sdn/2.25 | |
440 | else | |
441 | iq1=2 | |
442 | izh=6 | |
443 | gdbor=sdb/9. | |
444 | gdnon=sdn/9. | |
445 | endif | |
446 | ||
447 | wpi=wp0 | |
448 | wmi=(xd*wd-qq)/wpi | |
449 | iqc(2)=iq1 | |
450 | nj=nj+1 | |
451 | iqj(nj)=izh | |
452 | eqj(1,nj)=.5*(wm0-wmi) | |
453 | eqj(2,nj)=-eqj(1,nj) | |
454 | eqj(3,nj)=0. | |
455 | eqj(4,nj)=0. | |
456 | ncc(1,2)=nj | |
457 | ncc(2,2)=0 | |
458 | if(ish.ge.3)write (ifch,*)'wp0,wm0,wpi,wmi,iqc(2),eqj' | |
459 | if(ish.ge.3)write (ifch,*)wp0,wm0,wpi,wmi,iqc(2),eqj(2,nj) | |
460 | ||
461 | else | |
462 | xdmin=sdmin/wd | |
463 | xpmax=((egyevt-ammin)**2+qq)/wd | |
464 | iq1=int(3.*rangen()+1.)*(2.*int(.5+rangen())-1.) | |
465 | ||
466 | aks=rangen() | |
467 | if(long.eq.0.and.aks.lt.dqsh/gds(1).and. | |
468 | * egyevt.gt.ammin+sqrt(s00))then | |
469 | if(ish.ge.3)write (ifch,*)'no cascade for q_s', | |
470 | * aks,dqsh/gds(1) | |
471 | xd=qq/wd | |
472 | xpmin=xd+s00/wd | |
473 | jcasc=0 | |
474 | if(iq1.gt.0)then | |
475 | jq=1 | |
476 | else | |
477 | jq=2 | |
478 | endif | |
479 | else | |
480 | jcasc=1 | |
481 | call psdint(xpmax*wd,qq,sds0,sdn0,sdb0,sdt0,sdr0,0,long) | |
482 | call psdint(xpmax*wd,qq,sdsq0,sdnq0,sdbq0,sdtq0,sdrq0,1,long) | |
483 | if(ish.ge.3)write (ifch,*) | |
484 | * 'xpmax*wd,qq,sds0,sdn0,sdb0,sdt0,sdr0:' | |
485 | if(ish.ge.3)write (ifch,*) | |
486 | * xpmax*wd,qq,sds0,sdn0,sdb0,sdt0,sdr0 | |
487 | gb10=sdt0*fzeroGluZZ(0.,iclpro)+(sdnq0+sdtq0) | |
488 | * *fzeroSeaZZ(0.,iclpro) | |
489 | gb10=gb10*15. | |
490 | ||
491 | 4 xd=xdmin*(xpmax/xdmin)**rangen() | |
492 | xpmin=xd | |
493 | call psdint(xd*wd,qq,sds,sdn,sdb,sdt,sdr,0,long) | |
494 | call psdint(xd*wd,qq,sdsq,sdnq,sdbq,sdtq,sdrq,1,long) | |
495 | if(ish.ge.3)write (ifch,*)'xd*wd,qq,sds,sdn,sdb,sdt,sdr:' | |
496 | if(ish.ge.3)write (ifch,*)xd*wd,qq,sds,sdn,sdb,sdt,sdr | |
497 | wwg=sdt*fzeroGluZZ(xd,iclpro) | |
498 | wwq=(sdnq+sdtq)*fzeroSeaZZ(xd,iclpro) | |
499 | gb12=(wwq+wwg)/gb10*(xpmax/xd)**dels | |
500 | if(gb12.gt.1..and.ish.ge.1)write(ifmt,*) | |
501 | * 'gb12,xpmax*wd,xd*wd,sdt0,sdnq0+sdtq0,sdt,sdnq+sdtq', | |
502 | * gb12,xpmax*wd,xd*wd,sdt0,sdnq0+sdtq0,sdt,sdnq+sdtq, | |
503 | * wwq,wwg,(xpmax/xd)**dels,gb10 | |
504 | if(ish.ge.5)write (ifch,*)'gb12,xd,xpmax,wwq,wwg:' | |
505 | if(ish.ge.5)write (ifch,*)gb12,xd,xpmax,wwq,wwg | |
506 | if(rangen().gt.gb12)goto 4 | |
507 | endif | |
508 | ||
509 | if(jcasc.ne.0)then | |
510 | gb20=(1.-xd/xpmax)**betpom*sdt*(1.-glusea)+ | |
511 | * EsoftQZero(xd/xpmax)*(sdnq+sdtq)*glusea | |
512 | else | |
513 | gb20=EsoftQZero(xd/xpmax) | |
514 | endif | |
515 | if(1.+2.*(-alpqua)+dels.ge.0.)then | |
516 | xpminl=(1.-xpmax)**(alplea(iclpro)+1.) | |
517 | xpmaxl=(1.-xpmin)**(alplea(iclpro)+1.) | |
518 | ||
519 | 5 xp=1.-(xpminl+(xpmaxl-xpminl)*rangen())** | |
520 | * (1./(alplea(iclpro)+1.)) | |
521 | if(jcasc.ne.0)then | |
522 | gb2=((1.-xd/xp)**betpom*sdt*(1.-glusea)+ | |
523 | * EsoftQZero(xd/xp)*(sdnq+sdtq)*glusea)*(xp/xpmax)** | |
524 | * (1.+2.*(-alpqua)+dels)/gb20 | |
525 | else | |
526 | gb2=EsoftQZero(xd/xp)*(xp/xpmax)**(1.+2.*(-alpqua)+dels)/gb20 | |
527 | endif | |
528 | if(gb2.gt.1..and.ish.ge.1)then | |
529 | write(ifmt,*)'gb2,xp:',gb2,xp | |
530 | c read (*,*) | |
531 | endif | |
532 | if(rangen().gt.gb2)goto 5 | |
533 | else | |
534 | xpmaxl=xpmax**(2.+2.*(-alpqua)+dels) | |
535 | xpminl=xpmin**(2.+2.*(-alpqua)+dels) | |
536 | ||
537 | 6 xp=(xpminl+(xpmaxl-xpminl)*rangen())** | |
538 | * (1./(2.+2.*(-alpqua)+dels)) | |
539 | if(jcasc.ne.0)then | |
540 | gb21=((1.-xd/xp)**betpom*sdt*(1.-glusea)+ | |
541 | * EsoftQZero(xd/xp)*(sdnq+sdtq)*glusea)* | |
542 | * ((1.-xp)/(1.-xd))**alplea(iclpro)/gb20 | |
543 | else | |
544 | gb21=EsoftQZero(xd/xp)*((1.-xp)/(1.-xd))**alplea(iclpro)/gb20 | |
545 | endif | |
546 | if(gb21.gt.1..and.ish.ge.1)then | |
547 | write(ifmt,*)'gb21,xp:',gb21,xp | |
548 | c read (*,*) | |
549 | endif | |
550 | if(rangen().gt.gb21)goto 6 | |
551 | endif | |
552 | ||
553 | wwh=xd*wd-qq | |
554 | wwsh=xp*wd-qq | |
555 | ammax=(egyevt-sqrt(wwsh))**2 | |
556 | 22 call fremnx(ammax,ammin,sm,icp3,icp4,iret) | |
557 | if(iret.ne.0.and.ish.ge.1)write(ifmt,*)'iret.ne.0!' | |
558 | * ,ammax,ammin**2 | |
559 | wmn=(1.-xp)*wd/wp0 | |
560 | wpn=sm/wmn | |
561 | pnx=0. | |
562 | pny=0. | |
563 | wpp=wp0-wpn | |
564 | wmp=wm0-wmn | |
565 | if(ish.ge.5)write(ifch,*)'wp0,wm0,wpn,wmn,wpp,wmp:' | |
566 | if(ish.ge.5)write(ifch,*)wp0,wm0,wpn,wmn,wpp,wmp | |
567 | ||
568 | if(jcasc.eq.0.or.rangen().lt.wwq/(wwg+wwq). | |
569 | * and.xd*wd.gt.sqmin.and.wwsh.gt. | |
570 | * (sqrt(wwh)+sqrt(s00))**2)then | |
571 | zgmin=xd/xp | |
572 | zgmax=1./(1.+wp0/xd/wd/(wpp-wwh/wmp)) | |
573 | if(zgmin.gt.zgmax)goto 22 | |
574 | 23 zg=zgmin-rangen()*(zgmin-zgmax) | |
575 | if(rangen().gt.zg**dels*((1.-xd/xp/zg)/ (1.-xd/xp))**betpom) | |
576 | * goto 23 | |
577 | xg=xd/zg !w- share for the struck quark | |
578 | wmq=wd/wp0*(xg-xd) !w- for its counterpart | |
579 | wpq=s00/wmq !1. gev^2 / wmq | |
580 | wmq=0. | |
581 | wpp=wpp-wpq | |
582 | wmp=wmp-wmq | |
583 | sxx=wpp*wmp | |
584 | if(ish.ge.5)write (ifch,*)'wpq,wmq,wpp,wmp,sxx:' | |
585 | if(ish.ge.5)write (ifch,*)wpq,wmq,wpp,wmp,sxx | |
586 | ||
587 | if(jcasc.eq.0)then | |
588 | if(ish.ge.6)write (ifch,*)'before call timsh2: qq,sxx,iq1', | |
589 | * qq,sxx,iq1 | |
590 | call timsh2(qq,0.,sqrt(sxx),iq1,-iq1) | |
591 | ept(1)=.5*(wpp+wmp) | |
592 | ept(2)=.5*(wpp-wmp) | |
593 | ept(3)=0. | |
594 | ept(4)=0. | |
595 | call psdeftr(sxx,ept,ey) | |
596 | ep3(1)=pprt(4,2) | |
597 | ep3(2)=pprt(3,2) | |
598 | ep3(3)=0. | |
599 | ep3(4)=0. | |
600 | ||
601 | call pstrans(ep3,ey,1) | |
602 | wmp=ep3(1)-ep3(2) | |
603 | goto 24 | |
604 | endif | |
605 | else | |
606 | iq1=0 | |
607 | sxx=wpp*wmp | |
608 | endif | |
609 | ||
610 | if(ish.ge.3)write (ifch,*)'wwh,wwsh,sxx,wpp,wmp:', | |
611 | * wwh,wwsh,sxx,wpp,wmp | |
612 | ||
613 | wpi=wpp | |
614 | wmi=wwh/wpp | |
615 | wmp=wmp-wmi | |
616 | 24 call fremny(wpn,wmn,pnx,pny,sm,icp1,icp2,icp3,icp4,bx,ey0) | |
617 | ||
618 | if((-alpqua).eq.-1.)stop'dis does not work for 1/x' | |
619 | 25 aks=rangen() | |
620 | z=.5*aks**(1./(1.+(-alpqua))) | |
621 | if(z.lt.1.e-5.or.rangen().gt.(2.*(1.-z))**(-alpqua))goto 25 | |
622 | if(rangen().gt..5)z=1.-z | |
623 | wm2=wmp*z | |
624 | wm1=wmp-wm2 | |
625 | ||
626 | iqc(2)=iq1 | |
627 | nj=nj+1 | |
628 | iqj(nj)=-int(2.*rangen()+1.) | |
629 | iqj(nj+1)=-iqj(nj) | |
630 | eqj(1,nj)=.5*wm1 | |
631 | eqj(2,nj)=-eqj(1,nj) | |
632 | eqj(3,nj)=0. | |
633 | eqj(4,nj)=0. | |
634 | eqj(1,nj+1)=.5*wm2 | |
635 | eqj(2,nj+1)=-eqj(1,nj+1) | |
636 | eqj(3,nj+1)=0. | |
637 | eqj(4,nj+1)=0. | |
638 | nj=nj+1 | |
639 | ||
640 | if(iq1.eq.0)then | |
641 | ncc(1,2)=nj-1 | |
642 | ncc(2,2)=nj | |
643 | gdres=sdt-sds | |
644 | gdrga=sdr | |
645 | gdsin=sds | |
646 | gdbor=sdb | |
647 | gdnon=sdn | |
648 | else | |
649 | nj=nj+1 | |
650 | if(iabs(iq1).eq.3)then | |
651 | iqj(nj)=-iq1*4/3 | |
652 | else | |
653 | iqj(nj)=-iq1 | |
654 | endif | |
655 | eqj(1,nj)=.5*(wpq+wmq) | |
656 | eqj(2,nj)=.5*(wpq-wmq) | |
657 | eqj(3,nj)=0. | |
658 | eqj(4,nj)=0. | |
659 | if(iq1.gt.0)then | |
660 | ncj(1,nj)=nj-1 | |
661 | ncj(1,nj-1)=nj | |
662 | ncj(2,nj)=0 | |
663 | ncj(2,nj-1)=0 | |
664 | else | |
665 | ncj(1,nj)=nj-2 | |
666 | ncj(1,nj-2)=nj | |
667 | ncj(2,nj)=0 | |
668 | ncj(2,nj-2)=0 | |
669 | endif | |
670 | ||
671 | if(jcasc.eq.0)then | |
672 | if(iq1.gt.0)then | |
673 | nqc(1)=nj-2 | |
674 | nqc(2)=0 | |
675 | else | |
676 | nqc(1)=nj-1 | |
677 | nqc(2)=0 | |
678 | endif | |
679 | s0h=0. | |
680 | c0h=1. | |
681 | s0xh=0. | |
682 | c0xh=1. | |
683 | call psreti(nqc,jq,1,ey,s0xh,c0xh,s0h,c0h) | |
684 | goto 17 | |
685 | else | |
686 | gdres=(sdtq-sdsq)/4.5 | |
687 | gdrga=sdrq/4.5 | |
688 | gdsin=sdsq/4.5 | |
689 | gdbor=sdbq/4.5 | |
690 | gdnon=sdnq/4.5 | |
691 | if(iq1.gt.0)then | |
692 | ncc(1,2)=nj-2 | |
693 | ncc(2,2)=0 | |
694 | else | |
695 | ncc(1,2)=nj-1 | |
696 | ncc(2,2)=0 | |
697 | endif | |
698 | endif | |
699 | endif | |
700 | ||
701 | if(ish.ge.3)write (ifch,*)'wpn,wmn,wpi,wmi,wm1,wm2,nj' | |
702 | if(ish.ge.3)write (ifch,*)wpn,wmn,wpi,wmi,wm1,wm2,nj | |
703 | endif | |
704 | ||
705 | si=wpi*wmi+qq | |
706 | qmin(2)=q2min !effective momentum cutoff below | |
707 | s2min=max(4.*qq,16.*q2min) !mass cutoff for born scattering | |
708 | ||
709 | if(rangen().gt.gdres/(gdres+gdsin+gdnon).or. | |
710 | *si.lt.(s2min+qq))goto 12 | |
711 | ||
712 | c--------------------------------------- | |
713 | c hard pomeron (resolved photon) | |
714 | c--------------------------------------- | |
715 | if(ish.ge.3)write(ifmt,*)'resolved,gdrga,gdres',gdrga,gdres | |
716 | ||
717 | jj=1 | |
718 | if(rangen().gt.gdrga/gdres.and.si.gt.1.1*s2min+qq)then | |
719 | if(ish.ge.3)write(ifmt,*)'dir-res,si,qq',si,qq | |
720 | pt=0. | |
721 | pt2=0. | |
722 | iqc(1)=0 | |
723 | ept(1)=.5*(wpi+wmi) | |
724 | ept(2)=.5*(wpi-wmi) | |
725 | ept(3)=0. | |
726 | ept(4)=0. | |
727 | wpt(1)=wpi !lc+ for the current jet emission | |
728 | wpt(2)=si/wpi !lc- for the current jet emission | |
729 | ||
730 | qqmin=max(q2min,s2min/(si/qq-1.)) | |
731 | qqmax=min(si/2.,si-s2min) | |
732 | qmin(1)=qqmin | |
733 | xmax=1. | |
734 | xmin=(s2min+qq)/si | |
735 | if(qqmin.ge.qqmax.or.xmin.ge.xmax)stop'min>max' | |
736 | gb0=psjti(qmin(1),qq,si-qq,7,iqc(2),1)*psfap(1.d0,0,1) | |
737 | ||
738 | ncc(1,1)=0 | |
739 | ncc(2,1)=0 | |
740 | jgamma=1 | |
741 | ntry=0 | |
742 | goto 9 | |
743 | else | |
744 | if(ish.ge.3)write(ifmt,*)'res,si,qq',si,qq | |
745 | qmin(1)=q2min !effective momentum cutoff above | |
746 | si=si-qq | |
747 | zmin=s2min/si | |
748 | dft0=psdfh4(zmin,q2min,qq,0,0)*psjti(q2min,qq,si,0,iqc(2),1) | |
749 | * +(psdfh4(zmin,q2min,qq,0,1)+psdfh4(zmin,q2min,qq,0,2)+ | |
750 | * psdfh4(zmin,q2min,qq,0,3))*psjti(q2min,qq,si,7,iqc(2),1) | |
751 | ||
752 | 7 continue | |
753 | z=zmin**rangen() | |
754 | do i=1,4 | |
755 | dfp(i)=psdfh4(z,q2min,qq,0,i-1) | |
756 | enddo | |
757 | dfp(1)=dfp(1)*psjti(q2min,qq,z*si,0,iqc(2),1) | |
758 | dfptot=dfp(1) | |
759 | if(iqc(2).eq.0)then | |
760 | sjq=psjti(q2min,qq,z*si,1,0,1) | |
761 | do i=2,4 | |
762 | dfp(i)=dfp(i)*sjq | |
763 | dfptot=dfptot+dfp(i) | |
764 | enddo | |
765 | else | |
766 | sjqqp=psjti(q2min,qq,z*si,1,2,1) | |
767 | do i=2,4 | |
768 | if(iabs(iqc(2)).eq.i-1)then | |
769 | dfp(i)=dfp(i)*(psjti(q2min,qq,z*si,1,1,1)+ | |
770 | * psjti(q2min,qq,z*si,1,-1,1))/2. | |
771 | else | |
772 | dfp(i)=dfp(i)*sjqqp | |
773 | endif | |
774 | dfptot=dfptot+dfp(i) | |
775 | enddo | |
776 | endif | |
777 | ||
778 | if(rangen().gt.dfptot/dft0)goto 7 | |
779 | ||
780 | wpq=wpi*(1.-z) | |
781 | wpi=wpi*z | |
782 | aks=dfptot*rangen() | |
783 | if(aks.lt.dfp(1))then | |
784 | iqc(1)=0 | |
785 | nj=nj+1 | |
786 | ncc(1,1)=nj | |
787 | ncc(2,1)=nj+1 | |
788 | ||
789 | iqj(nj)=-int(2.*rangen()+1.) | |
790 | iqj(nj+1)=-iqj(nj) | |
791 | wpq1=wpq*rangen() | |
792 | eqj(1,nj)=.5*wpq1 | |
793 | eqj(2,nj)=eqj(1,nj) | |
794 | eqj(3,nj)=0. | |
795 | eqj(4,nj)=0. | |
796 | eqj(1,nj+1)=.5*(wpq-wpq1) | |
797 | eqj(2,nj+1)=eqj(1,nj+1) | |
798 | eqj(3,nj+1)=0. | |
799 | eqj(4,nj+1)=0. | |
800 | nj=nj+1 | |
801 | ||
802 | else | |
803 | if(aks.lt.dfp(1)+dfp(2))then | |
804 | iqc(1)=1 | |
805 | elseif(aks.lt.dfp(1)+dfp(2)+dfp(3))then | |
806 | iqc(1)=2 | |
807 | else | |
808 | iqc(1)=3 | |
809 | endif | |
810 | iqc(1)=iqc(1)*(2*int(2.*rangen())-1) | |
811 | nj=nj+1 | |
812 | ncc(1,1)=nj | |
813 | ncc(2,1)=0 | |
814 | ||
815 | iqj(nj)=-iqc(1) | |
816 | eqj(1,nj)=.5*wpq | |
817 | eqj(2,nj)=eqj(1,nj) | |
818 | eqj(3,nj)=0. | |
819 | eqj(4,nj)=0. | |
820 | endif | |
821 | ||
822 | ept(1)=.5*(wpi+wmi) | |
823 | ept(2)=.5*(wpi-wmi) | |
824 | ept(3)=0. | |
825 | ept(4)=0. | |
826 | jgamma=0 | |
827 | ntry=0 | |
828 | endif | |
829 | ||
830 | 8 continue | |
831 | ||
832 | c ladder rung | |
833 | c--------------------------------------- | |
834 | pt2=ept(3)**2+ept(4)**2 | |
835 | pt=sqrt(pt2) | |
836 | ||
837 | wpt(1)=ept(1)+ept(2) !lc+ for the current jet emissi | |
838 | wpt(2)=ept(1)-ept(2) !lc- for the current jet emissi | |
839 | ||
840 | s2min=max(qmin(1),16.*qmin(2)) !mass cutoff for born | |
841 | s2min=max(s2min,4.*qq) | |
842 | ||
843 | if(jj.eq.1)then | |
844 | wwmin=2.*s2min-2.*pt*sqrt(q2ini) | |
845 | wwmin=(wwmin+sqrt(wwmin**2+4.*pt2*(s2min-q2ini))) | |
846 | * /(1.-q2ini/s2min)/2. | |
847 | sj=psjti(qmin(1),qq,si,iqc(1),iqc(2),1) !total jet | |
848 | sj2=psjti1(q2min,qmin(1),qq,si,iqc(2),iqc(1),1) | |
849 | if(ish.ge.3)write(ifch,*)'resolved - si,wwmin,s2min,sj,sj2:' | |
850 | if(ish.ge.3)write(ifch,*)si,wwmin,s2min,sj,sj2 | |
851 | if(sj.eq.0.)stop'sj=0' | |
852 | if(rangen().gt.sj2/sj.and.si.gt.1.1*wwmin)goto 26 | |
853 | jj=2 | |
854 | endif | |
855 | sj=psjti1(qmin(2),qmin(1),qq,si,iqc(2),iqc(1),1) | |
856 | sjb=psbint(qmin(1),qmin(2),qq,si,iqc(1),iqc(2),1) !born parton-parton | |
857 | wwmin=17./16*s2min-2.*pt*sqrt(q2ini) | |
858 | wwmin=(wwmin+sqrt(wwmin**2+pt2*(s2min/4.-4.*q2ini))) | |
859 | */(1.-16.*q2ini/s2min)/2. | |
860 | if(rangen().lt.sjb/sj.or.si.lt.1.1*wwmin)goto 10 | |
861 | ||
862 | 26 continue | |
863 | wpt(jj)=wpt(jj)-pt2/wpt(3-jj) | |
864 | ||
865 | if(jj.eq.1)then | |
866 | discr=(si+2.*pt*sqrt(q2ini))**2-4.*q2ini*(2.*si+pt2) | |
867 | if(discr.lt.0..and.ish.ge.1)write(ifmt,*)'discr,si,pt,wwmin', | |
868 | * discr,si,pt,wwmin | |
869 | discr=sqrt(discr) | |
870 | qqmax=(si+2.*pt*sqrt(q2ini)+discr)/2./(2.+pt2/si) | |
871 | else | |
872 | discr=(si+2.*pt*sqrt(q2ini))**2-4.*q2ini*(17.*si+pt2) | |
873 | if(discr.lt.0..and.ish.ge.1)write(ifmt,*)'discr,si,pt,wwmin', | |
874 | * discr,si,pt,wwmin | |
875 | discr=sqrt(discr) | |
876 | qqmax=(si+2.*pt*sqrt(q2ini)+discr)/2./(17.+pt2/si) | |
877 | endif | |
878 | qqmin=2.*q2ini*si/(si+2.*pt*sqrt(q2ini)+discr) | |
879 | if(jj.eq.1.and.s2min.gt.qqmin.or. | |
880 | *jj.eq.2.and.s2min.gt.16.*qqmin)then | |
881 | xmm=.5*(si-s2min+2.*pt*sqrt(q2ini)) | |
882 | discr=xmm**2-q2ini*(si+pt2) | |
883 | if(discr.lt.0..and.ish.ge.1)write(ifmt,*)'discr1,si,pt,wwmin', | |
884 | * discr,si,pt,wwmin | |
885 | qqmin=q2ini*si/(xmm+sqrt(discr)) | |
886 | endif | |
887 | ||
888 | xmin=1.-q2ini/qqmin | |
889 | xmax=1.-q2ini/qqmax | |
890 | if(ish.ge.6)write(ifch,*)'qqmin,qqmax,xmin,xmax', | |
891 | *qqmin,qqmax,xmin,xmax | |
892 | if(qqmin.lt.qmin(jj))then | |
893 | qqmin=qmin(jj) | |
894 | xmi=max(1.-((pt*sqrt(qqmin)+sqrt(pt2*qqmin+ | |
895 | * si*(si-s2min-qqmin*(1.+pt2/si))))/si)**2, | |
896 | * (s2min+qqmin*(1.+pt2/si)-2.*pt*sqrt(qqmin))/si) | |
897 | xmin=max(xmin,xmi) | |
898 | if(xmin.le.0.)xmin=(s2min+qqmin*(1.+pt2/si))/si | |
899 | if(ish.ge.6)write(ifch,*)'qqmin,qmin(jj),xmin,s2min', | |
900 | * qqmin,qmin(jj),xmin,s2min | |
901 | endif | |
902 | ||
903 | qm0=qmin(jj) | |
904 | xm0=1.-q2ini/qm0 | |
905 | if(xm0.gt.xmax.or.xm0.lt.xmin)then | |
906 | xm0=.5*(xmax+xmin) | |
907 | endif | |
908 | c s2max=xm0*si | |
909 | s2max=xm0*si-qm0*(1.+pt2/si)+2.*pt*sqrt(q2ini) !new ladder mass squared | |
910 | xx=xm0 | |
911 | ||
912 | if(jj.eq.1)then | |
913 | sj0=psjti(qm0,qq,s2max,0,iqc(2),1)*psfap(xx,iqc(1),0)+ | |
914 | * psjti(qm0,qq,s2max,7,iqc(2),1)*psfap(xx,iqc(1),1) | |
915 | gb0=sj0/log(q2ini/qcdlam)*sngl(psuds(qm0,iqc(1)))*qm0*2. | |
916 | else | |
917 | sj0=psjti1(qm0,qmin(1),qq,s2max,0,iqc(1),1)*psfap(xx,iqc(2),0) | |
918 | * +psjti1(qm0,qmin(1),qq,s2max,7,iqc(1),1)*psfap(xx,iqc(2),1) | |
919 | gb0=sj0/log(q2ini/qcdlam)*sngl(psuds(qm0,iqc(2)))*qm0*2. | |
920 | endif | |
921 | if(gb0.le.0.)then | |
922 | write(ifmt,*)'gb0.le.0. si,qq,pt2:',si,qq,pt2 | |
923 | iret=1 | |
924 | goto 9999 | |
925 | endif | |
926 | if(xm0.le..5)then | |
927 | gb0=gb0*xm0**(1.-delh) | |
928 | else | |
929 | gb0=gb0*(1.-xm0)*2.**delh | |
930 | endif | |
931 | ||
932 | xmin2=max(.5,xmin) | |
933 | xmin1=xmin**delh !xmin, xmax are put into powe | |
934 | xmax1=min(xmax,.5)**delh !to simulate x value below | |
935 | if(xmin.ge..5)then | |
936 | djl=1. | |
937 | elseif(xmax.lt..5)then | |
938 | djl=0. | |
939 | else | |
940 | djl=1./(1.+((2.*xmin)**delh-1.)/delh/ | |
941 | * log(2.*(1.-xmax))) | |
942 | endif | |
943 | ||
944 | ntry=0 | |
945 | 9 continue | |
946 | ntry=ntry+1 | |
947 | if(ntry.ge.10000)then | |
948 | print *,"ntry.ge.10000" | |
949 | iret=1 | |
950 | goto 9999 | |
951 | endif | |
952 | if(jgamma.ne.1)then | |
953 | if(rangen().gt.djl)then !lc momentum share in the cur | |
954 | x=(xmin1+rangen()*(xmax1-xmin1))**(1./delh) | |
955 | else | |
956 | x=1.-(1.-xmin2)*((1.-xmax)/(1.-xmin2))**rangen() | |
957 | endif | |
958 | q2=qqmin/(1.+rangen()*(qqmin/qqmax-1.)) | |
959 | qt2=q2*(1.-x) | |
960 | if(ish.ge.6)write(ifch,*)'jj,q2,x,qt2',jj,q2,x,qt2 | |
961 | if(qt2.lt.q2ini)goto 9 | |
962 | else | |
963 | x=xmin+rangen()*(xmax-xmin) | |
964 | q2=qqmin*(qqmax/qqmin)**rangen() | |
965 | qt2=(q2-x*qq)*(1.-x) | |
966 | if(ish.ge.6)write(ifch,*)'jj,q2,x,qt2',jj,q2,x,qt2 | |
967 | if(qt2.lt.0.)goto 9 | |
968 | endif | |
969 | ||
970 | qt=sqrt(qt2) | |
971 | call pscs(bcos,bsin) | |
972 | c ep3 is now 4-vector for s-channel gluon produced in current ladder run | |
973 | ep3(3)=qt*bcos | |
974 | ep3(4)=qt*bsin | |
975 | ptnew=(ept(3)-ep3(3))**2+(ept(4)-ep3(4))**2 | |
976 | if(jj.eq.1)then | |
977 | s2min2=max(q2,s2min) | |
978 | else | |
979 | s2min2=max(s2min,16.*q2) | |
980 | endif | |
981 | ||
982 | if(jgamma.ne.1)then | |
983 | s2=x*si-q2*(1.+pt2/si)-ptnew+pt2+qt2 !new ladder mass squared | |
984 | if(s2.lt.s2min2)goto 9 !rejection in case of too low mass | |
985 | xx=x | |
986 | ||
987 | if(jj.eq.1)then | |
988 | sj1=psjti(q2,qq,s2,0,iqc(2),1) | |
989 | if(iqc(1).ne.0)then | |
990 | sj2=psjti(q2,qq,s2,iqc(1),iqc(2),1) | |
991 | elseif(iqc(2).eq.0)then | |
992 | sj2=psjti(q2,qq,s2,1,0,1) | |
993 | else | |
994 | sj2=psjti(q2,qq,s2,1,1,1)/6.+ | |
995 | * psjti(q2,qq,s2,-1,1,1)/6.+ | |
996 | * psjti(q2,qq,s2,2,1,1)/1.5 | |
997 | endif | |
998 | else | |
999 | sj1=psjti1(q2,qmin(1),qq,s2,0,iqc(1),1) | |
1000 | if(iqc(2).ne.0)then | |
1001 | sj2=psjti1(q2,qmin(1),qq,s2,iqc(2),iqc(1),1) | |
1002 | elseif(iqc(1).eq.0)then | |
1003 | sj2=psjti1(q2,qmin(1),qq,s2,1,0,1) | |
1004 | else | |
1005 | sj2=psjti1(q2,qmin(1),qq,s2,1,1,1)/6.+ | |
1006 | * psjti1(q2,qmin(1),qq,s2,-1,1,1)/6.+ | |
1007 | * psjti1(q2,qmin(1),qq,s2,2,1,1)/1.5 | |
1008 | endif | |
1009 | endif | |
1010 | c gb7 is the rejection function for x and q**2 simulation | |
1011 | gb7=(sj1*psfap(xx,iqc(jj),0)+sj2*psfap(xx,iqc(jj),1)) | |
1012 | * /log(qt2/qcdlam)*sngl(psuds(q2,iqc(jj)))*q2/gb0 | |
1013 | ||
1014 | if(x.le..5)then | |
1015 | gb7=gb7*x**(1.-delh) | |
1016 | else | |
1017 | gb7=gb7*(1.-x)*2.**delh | |
1018 | endif | |
1019 | else | |
1020 | s2=x*si-q2 !new ladder mass squared | |
1021 | if(s2.lt.s2min2)goto 9 !rejection in case of too low mass | |
1022 | ||
1023 | sj1=0. | |
1024 | xx=x | |
1025 | if(iqc(2).eq.0)then | |
1026 | sj2=psjti(q2,qq,s2,1,0,1) | |
1027 | else | |
1028 | sj2=psjti(q2,qq,s2,1,1,1)/naflav/2.+ | |
1029 | * psjti(q2,qq,s2,-1,1,1)/naflav/2.+ | |
1030 | * psjti(q2,qq,s2,2,1,1)*(1.-1./naflav) | |
1031 | endif | |
1032 | gb7=sj2*psfap(xx,0,1)/gb0 !????*(1.-x*qq/q2) | |
1033 | endif | |
1034 | if(gb7.gt.1..or.gb7.lt.0..and.ish.ge.1)write(ifmt,*)'gb7,q2,x,gb0' | |
1035 | *,gb7,q2,x,gb0 | |
1036 | if(rangen().gt.gb7)goto 9 | |
1037 | ||
1038 | if(ish.ge.6)write(ifch,*)'res: jj,iqc,ncc:', | |
1039 | *jj,iqc(jj),ncc(1,jj),ncc(2,jj) | |
1040 | ||
1041 | nqc(2)=0 | |
1042 | iqnew=iqc(jj) | |
1043 | if(jgamma.ne.1)then | |
1044 | if(rangen().lt.sj1/(sj1+sj2))then | |
1045 | if(iqc(jj).eq.0)then | |
1046 | jt=1 | |
1047 | jq=int(1.5+rangen()) | |
1048 | nqc(1)=ncc(jq,jj) | |
1049 | else | |
1050 | jt=2 | |
1051 | if(iqc(jj).gt.0)then | |
1052 | jq=1 | |
1053 | else | |
1054 | jq=2 | |
1055 | endif | |
1056 | nqc(1)=0 | |
1057 | iqnew=0 | |
1058 | endif | |
1059 | iq1=iqc(jj) | |
1060 | else | |
1061 | if(iqc(jj).ne.0)then | |
1062 | iq1=0 | |
1063 | jt=3 | |
1064 | if(iqc(jj).gt.0)then | |
1065 | jq=1 | |
1066 | else | |
1067 | jq=2 | |
1068 | endif | |
1069 | nqc(1)=ncc(1,jj) | |
1070 | else | |
1071 | jt=4 | |
1072 | jq=int(1.5+rangen()) | |
1073 | iq1=int(naflav*rangen()+1.)*(3-2*jq) | |
1074 | nqc(1)=ncc(jq,jj) | |
1075 | iqnew=-iq1 | |
1076 | endif | |
1077 | endif | |
1078 | else | |
1079 | jt=5 | |
1080 | jq=int(1.5+rangen()) | |
1081 | iq1=int(naflav*rangen()+1.)*(3-2*jq) | |
1082 | iqnew=-iq1 | |
1083 | nqc(1)=0 | |
1084 | endif | |
1085 | eprt=max(1.d0*qt, | |
1086 | *.5d0*((1.d0-x)*wpt(jj)+qt2/(1.d0-x)/wpt(jj))) | |
1087 | pl=((1.d0-x)*wpt(jj)-eprt)*(3-2*jj) | |
1088 | if(iq1.eq.0)then | |
1089 | iq2ini=9 | |
1090 | else | |
1091 | iq2ini=iq1 | |
1092 | endif | |
1093 | 27 call timsh1(q2,sngl(eprt),iq2ini) | |
1094 | amprt=pprt(5,1)**2 | |
1095 | plprt=eprt**2-amprt-qt2 | |
1096 | if(plprt.lt.-1d-6)goto 27 | |
1097 | ep3(1)=eprt | |
1098 | ep3(2)=dsqrt(max(0.d0,plprt)) | |
1099 | if(pl.lt.0.d0)ep3(2)=-ep3(2) | |
1100 | ey(1)=1. | |
1101 | ey(2)=1. | |
1102 | ey(3)=1. | |
1103 | do i=1,4 | |
1104 | ept1(i)=ept(i)-ep3(i) | |
1105 | enddo | |
1106 | call psdefrot(ep3,s0xh,c0xh,s0h,c0h) | |
1107 | if(ish.ge.6)then | |
1108 | write(ifch,*)'q2,amprt,qt2',q2,amprt,qt2 | |
1109 | write(ifch,*)'eprt,plprt',eprt,plprt | |
1110 | write(ifch,*)'ep3',ep3 | |
1111 | write(ifch,*)'ept',ept | |
1112 | write(ifch,*)'ept1',ept1 | |
1113 | endif | |
1114 | s2new=psnorm(ept1) | |
1115 | ||
1116 | if(s2new.gt.s2min2)then | |
1117 | if(jj.eq.1)then | |
1118 | gb=psjti(q2,qq,s2new,iqnew,iqc(2),1) | |
1119 | else | |
1120 | gb=psjti1(q2,qmin(1),qq,s2new,iqnew,iqc(1),1) | |
1121 | endif | |
1122 | if(iqnew.eq.0)then | |
1123 | gb=gb/sj1 | |
1124 | else | |
1125 | gb=gb/sj2 | |
1126 | endif | |
1127 | if(ish.ge.1)then | |
1128 | if(gb.gt.1.)write (ifch,*)'gb,s2new,s2,q2,iqnew', | |
1129 | * gb,s2new,s2,q2,iqnew | |
1130 | endif | |
1131 | if(rangen().gt.gb)goto 9 | |
1132 | else | |
1133 | goto 9 | |
1134 | endif | |
1135 | jgamma=0 | |
1136 | ||
1137 | call psreti(nqc,jq,1,ey,s0xh,c0xh,s0h,c0h) | |
1138 | ||
1139 | if(jt.eq.1)then | |
1140 | ncc(jq,jj)=nqc(2) | |
1141 | elseif(jt.eq.2)then | |
1142 | ncc(jq,jj)=ncc(1,jj) | |
1143 | ncc(3-jq,jj)=nqc(1) | |
1144 | elseif(jt.eq.3)then | |
1145 | ncc(1,jj)=nqc(2) | |
1146 | elseif(jt.eq.4)then | |
1147 | ncc(1,jj)=ncc(3-jq,jj) | |
1148 | elseif(jt.eq.5)then | |
1149 | ncc(1,jj)=nqc(1) | |
1150 | ncc(2,jj)=0 | |
1151 | endif | |
1152 | iqc(jj)=iqnew | |
1153 | if(ish.ge.6)write(ifch,*)'qt2,amprt,ncc:', | |
1154 | *qt2,amprt,ncc(1,jj),ncc(2,jj) | |
1155 | ||
1156 | do i=1,4 | |
1157 | ept(i)=ept1(i) | |
1158 | enddo | |
1159 | c c.m. energy squared, minimal 4-momentum transfer square and gluon 4-v | |
1160 | c for the next ladder run | |
1161 | qmin(jj)=q2 | |
1162 | si=s2new | |
1163 | if(ish.ge.3)write (ifch,*)'res: new jet - iqj,ncj,ep3,ept', | |
1164 | *iqj(nj),ncj(1,nj),ncj(2,nj),ep3,ept | |
1165 | ||
1166 | goto 8 !next simulation step will be considered | |
1167 | ||
1168 | 10 continue | |
1169 | if(ish.ge.3)write(ifch,*)'res: iqc,si,ept:',iqc,si,ept | |
1170 | ||
1171 | c highest virtuality subprocess in the ladder | |
1172 | c--------------------------------------- | |
1173 | qqs=max(qmin(1)/4.,4.*qmin(2)) | |
1174 | qqs=max(qqs,qq) | |
1175 | call psabor(si,qqs,iqc,ncc,ept,1,nptlh,bx) | |
1176 | goto 17 | |
1177 | ||
1178 | 12 continue | |
1179 | c--------------------------------------- | |
1180 | c hard pomeron (direct photon) | |
1181 | c--------------------------------------- | |
1182 | ept(1)=.5*(wpi+wmi) | |
1183 | ept(2)=.5*(wpi-wmi) | |
1184 | ept(3)=0. | |
1185 | ept(4)=0. | |
1186 | if(ish.ge.3)write (ifch,*)'direct photon - ept,si,qq:',ept,si,qq | |
1187 | ||
1188 | 13 continue | |
1189 | ||
1190 | c ladder rung | |
1191 | c--------------------------------------- | |
1192 | pt2=ept(3)**2+ept(4)**2 | |
1193 | pt=sqrt(pt2) | |
1194 | wpt(1)=ept(1)+ept(2) | |
1195 | wpt(2)=si/wpt(1) | |
1196 | ||
1197 | gdbor=psdbin(qmin(2),qq,si,iqc(2),long) | |
1198 | gdtot=psdsin(qmin(2),qq,si,iqc(2),long) | |
1199 | if(iqc(2).ne.0)then | |
1200 | if(ish.ge.8)write (ifch,*)'qmin(2),qq,si',qmin(2),qq,si | |
1201 | gdnon=psdnsi(qmin(2),qq,si,long) | |
1202 | if(iabs(iqc(2)).eq.1.or.iabs(iqc(2)).eq.4)then | |
1203 | gdbor=gdbor/2.25 | |
1204 | gdtot=gdnon/2.25+gdtot/4.5 | |
1205 | else | |
1206 | gdbor=gdbor/9. | |
1207 | gdtot=gdnon/9.+gdtot/4.5 | |
1208 | endif | |
1209 | else | |
1210 | gdnon=0. | |
1211 | endif | |
1212 | ||
1213 | if(long.ne.0.or.qmin(2).ge.qq)then | |
1214 | s2min=qq+4.*max(qmin(2),qcmass**2) | |
1215 | wwmin=(5.*s2min-qq)/4.-2.*pt*sqrt(q2ini) | |
1216 | wwmin=(wwmin+sqrt(wwmin**2-(qq-pt2)*(s2min-qq-4.*q2ini))) | |
1217 | * /2./(1.-4.*q2ini/(s2min-qq)) | |
1218 | else | |
1219 | s2min=qq/(1.-sqrt(q2ini/qq)) | |
1220 | wwmin=s2min+qq-2.*pt*sqrt(q2ini) | |
1221 | wwmin=(wwmin+sqrt(wwmin**2-4.*(qq-pt2)*(qq-q2ini))) | |
1222 | * /2./(1.-q2ini/qq) | |
1223 | endif | |
1224 | ||
1225 | if(ish.ge.3)write(ifch,*)'si,s2min,wwmin,qmin(2),gdtot,gdbor:' | |
1226 | if(ish.ge.3)write(ifch,*)si,s2min,wwmin,qmin(2),gdtot,gdbor | |
1227 | ||
1228 | if((rangen().lt.gdbor/gdtot.or.si.lt.1.1*wwmin).and. | |
1229 | *(long.eq.0.and.qmin(2).lt.qq.or.iqc(2).eq.0))goto 15 | |
1230 | if(si.lt.1.1*wwmin)stop'si<1.1*wwmin' | |
1231 | ||
1232 | qqmax=0. | |
1233 | qqmin=0. | |
1234 | ||
1235 | xmm=si+2.*sqrt(q2ini)*pt-qq | |
1236 | discr=xmm**2-4.*q2ini*(5.*si-qq+pt2) | |
1237 | if(discr.lt.0.)goto 29 | |
1238 | discr=sqrt(discr) | |
1239 | qqmax=(xmm+discr)/2./(5.-(qq-pt2)/si) | |
1240 | qqmin=2.*q2ini*si/(xmm+discr) | |
1241 | ||
1242 | 29 continue | |
1243 | if(4.*qqmin.lt.s2min-qq.or.long.eq.0.and. | |
1244 | *qmin(2).lt.qq)then | |
1245 | xmm=si-s2min+2.*sqrt(q2ini)*pt | |
1246 | qqmin=2.*q2ini*si/(xmm+sqrt(xmm**2-4.*q2ini*(si-qq+pt2))) | |
1247 | endif | |
1248 | xmin=1.-q2ini/qqmin | |
1249 | ||
1250 | if(qqmin.lt.qmin(2))then | |
1251 | qqmin=qmin(2) | |
1252 | xmi=max(1.-((pt*sqrt(qqmin)+sqrt(pt2*qqmin+ | |
1253 | * si*(si-s2min-qqmin*(1.-(qq-pt2)/si))))/si)**2, | |
1254 | * (s2min+qqmin*(1.-(qq-pt2)/si)-2.*pt*sqrt(qqmin))/si) | |
1255 | xmin=max(xmin,xmi) | |
1256 | endif | |
1257 | if(xmin.le.qq/si)xmin=1.001*qq/si | |
1258 | ||
1259 | if(long.eq.0.and.qmin(2).lt.qq)qqmax=max(qqmax,qq) | |
1260 | xmax=1.-q2ini/qqmax | |
1261 | ||
1262 | if(ish.ge.6)write(ifch,*)'qqmax,qqmin,xmax,xmin:', | |
1263 | *qqmax,qqmin,xmax,xmin | |
1264 | if(qqmax.lt.qqmin)stop'qqmax<qqmin' | |
1265 | ||
1266 | qm0=qqmin | |
1267 | xm0=1.-q2ini/qm0 | |
1268 | s2max=si*xm0-qm0*(1.-qq/si) | |
1269 | ||
1270 | sds=psdsin(qm0,qq,s2max,0,long)/4.5 | |
1271 | sdv=psdsin(qm0,qq,s2max,1,long)/4.5 | |
1272 | ||
1273 | sdn=psdnsi(qm0,qq,s2max,long) | |
1274 | if(iqc(2).eq.0)then | |
1275 | sdn=sdn/4.5 | |
1276 | elseif(iabs(iqc(2)).eq.1.or.iabs(iqc(2)).eq.4)then | |
1277 | sdn=sdn/2.25 | |
1278 | else | |
1279 | sdn=sdn/9. | |
1280 | endif | |
1281 | sdv=sdv+sdn | |
1282 | xx=xm0 | |
1283 | ||
1284 | sj0=sds*psfap(xx,iqc(2),0)+sdv*psfap(xx,iqc(2),1) | |
1285 | gb0=sj0/log(q2ini/qcdlam)*sngl(psuds(qm0,iqc(2)))*qm0*5. | |
1286 | if(gb0.le.0.)then | |
1287 | write(ifmt,*)'gb0.le.0. si,qq,pt2:',si,qq,pt2 | |
1288 | iret=1 | |
1289 | goto 9999 | |
1290 | endif | |
1291 | ||
1292 | if(xm0.le..5)then | |
1293 | gb0=gb0*(xm0-qq/si)/(1.-2.*qq/si) | |
1294 | else | |
1295 | gb0=gb0*(1.-xm0) | |
1296 | endif | |
1297 | ||
1298 | xmin2=max(.5,xmin) | |
1299 | xmax1=min(xmax,.5) | |
1300 | if(xmin.ge..5)then | |
1301 | djl=1. | |
1302 | elseif(xmax.lt..5)then | |
1303 | djl=0. | |
1304 | else | |
1305 | djl=1./(1.-(1.-2.*qq/si)*log((.5-qq/si)/(xmin-qq/si))/ | |
1306 | * log(2.*(1.-xmax))) | |
1307 | endif | |
1308 | ||
1309 | 14 continue | |
1310 | if(rangen().gt.djl)then !lc momentum share in the cur | |
1311 | x=(xmin-qq/si)*((xmax1-qq/si)/(xmin-qq/si))**rangen()+qq/si | |
1312 | else | |
1313 | x=1.-(1.-xmin2)*((1.-xmax)/(1.-xmin2))**rangen() | |
1314 | endif | |
1315 | ||
1316 | q2=qqmin/(1.+rangen()*(qqmin/qqmax-1.)) | |
1317 | ||
1318 | qt2=q2*(1.-x) | |
1319 | if(ish.ge.9)write(ifch,*)'q2,x,qt2,qq,qqmin,qqmax:', | |
1320 | *q2,x,qt2,qq,qqmin,qqmax | |
1321 | if(qt2.lt.q2ini)goto 14 !p_t check | |
1322 | ||
1323 | if(long.ne.0.or.q2.ge.qq)then | |
1324 | s2min2=max(4.*q2+qq,s2min) | |
1325 | else | |
1326 | s2min2=s2min | |
1327 | endif | |
1328 | qt=sqrt(qt2) | |
1329 | call pscs(bcos,bsin) | |
1330 | c ep3 is now 4-vector for s-channel gluon produced in current ladder run | |
1331 | ep3(3)=qt*bcos | |
1332 | ep3(4)=qt*bsin | |
1333 | ptnew=(ept(3)-ep3(3))**2+(ept(4)-ep3(4))**2 | |
1334 | ||
1335 | s2=x*si-ptnew+pt2-q2*(x-(qq-pt2)/si) | |
1336 | if(s2.lt.s2min2)goto 14 !check of the kinematics | |
1337 | sds=psdsin(q2,qq,s2,0,long)/4.5 | |
1338 | sdv0=psdsin(q2,qq,s2,1,long)/4.5 | |
1339 | if(ish.ge.8)write (ifch,*)'q2,qq,s2',q2,qq,s2 | |
1340 | sdn0=psdnsi(q2,qq,s2,long) | |
1341 | ||
1342 | if(iqc(2).eq.0)then | |
1343 | sdn=sdn0/4.5 | |
1344 | else | |
1345 | if(iabs(iqc(2)).eq.1.or.iabs(iqc(2)).eq.4)then | |
1346 | sdn=sdn0/2.25 | |
1347 | else | |
1348 | sdn=sdn0/9. | |
1349 | endif | |
1350 | endif | |
1351 | sdv=sdv0+sdn | |
1352 | ||
1353 | xx=x | |
1354 | sj1=sds*psfap(xx,iqc(2),0) | |
1355 | sj2=sdv*psfap(xx,iqc(2),1) | |
1356 | ||
1357 | c gb7 is the rejection function for x and q**2 simulation. | |
1358 | gb7=(sj1+sj2)/log(qt2/qcdlam)*sngl(psuds(q2,iqc(2)))/gb0*q2 | |
1359 | if(x.le..5)then | |
1360 | gb7=gb7*(x-qq/si)/(1.-2.*qq/si) | |
1361 | else | |
1362 | gb7=gb7*(1.-x) | |
1363 | endif | |
1364 | ||
1365 | if(gb7.gt.1..and.ish.ge.1)write(ifmt,*)'gb7,q2,x,qt2,iqc(2),' | |
1366 | * ,'gb0,sj1,sj2',gb7,q2,x,qt2,iqc(2),gb0,sj1,sj2 | |
1367 | if(ish.ge.3)write (ifch,*)'gb7,q2,x,qt2,iqc(2),gb0,sj1,sj2,long', | |
1368 | * gb7,q2,x,qt2,iqc(2),gb0,sj1,sj2,long | |
1369 | if(rangen().gt.gb7)goto 14 | |
1370 | ||
1371 | ||
1372 | if(ish.ge.6)write(ifch,*)'iqc,ncc:',iqc(2),ncc(1,2),ncc(2,2) | |
1373 | iqcnew=iqc(2) | |
1374 | nqc(2)=0 !emitted parton color connections | |
1375 | if(rangen().lt.sj1/(sj1+sj2).or.(long.ne.0.or.q2.ge.qq).and. | |
1376 | *s2.lt.1.5*s2min2)then | |
1377 | if(iqc(2).eq.0)then | |
1378 | jt=1 | |
1379 | jq=int(1.5+rangen()) | |
1380 | nqc(1)=ncc(jq,2) | |
1381 | else | |
1382 | jt=2 | |
1383 | if(iqc(2).gt.0)then | |
1384 | jq=1 | |
1385 | else | |
1386 | jq=2 | |
1387 | endif | |
1388 | nqc(1)=0 | |
1389 | endif | |
1390 | iq1=iqc(2) | |
1391 | iqcnew=0 | |
1392 | ||
1393 | else | |
1394 | if(iqc(2).ne.0)then | |
1395 | jt=3 | |
1396 | iq1=0 | |
1397 | if(iqc(2).gt.0)then | |
1398 | jq=1 | |
1399 | else | |
1400 | jq=2 | |
1401 | endif | |
1402 | nqc(1)=ncc(1,2) | |
1403 | ||
1404 | else | |
1405 | tu=sdn0/2.25+sdv0 | |
1406 | if(naflav.eq.4)tu=tu*2. | |
1407 | td=sdn0/9.+sdv0 | |
1408 | if(rangen().lt.tu/(tu+2.*td))then | |
1409 | if(naflav.eq.3)then | |
1410 | iq1=1 | |
1411 | else | |
1412 | iq1=1+3*int(.5+rangen()) | |
1413 | endif | |
1414 | else | |
1415 | iq1=int(2.5+rangen()) | |
1416 | endif | |
1417 | jq=int(1.5+rangen()) | |
1418 | iq1=iq1*(3-2*jq) | |
1419 | iqcnew=-iq1 | |
1420 | jt=4 | |
1421 | nqc(1)=ncc(jq,2) | |
1422 | endif | |
1423 | endif | |
1424 | ||
1425 | eprt=max(1.d0*qt, | |
1426 | *.5d0*((1.d0-x)*wpt(2)+qt2/(1.d0-x)/wpt(2))) | |
1427 | pl=eprt-(1.d0-x)*wpt(2) | |
1428 | if(iq1.eq.0)then | |
1429 | iq2ini=9 | |
1430 | else | |
1431 | iq2ini=iq1 | |
1432 | endif | |
1433 | 28 call timsh1(q2,sngl(eprt),iq2ini) | |
1434 | amprt=pprt(5,1)**2 | |
1435 | plprt=eprt**2-amprt-qt2 | |
1436 | if(plprt.lt.-1d-6)goto 28 | |
1437 | ep3(1)=eprt | |
1438 | ep3(2)=dsqrt(max(0.d0,plprt)) | |
1439 | if(pl.lt.0.d0)ep3(2)=-ep3(2) | |
1440 | ey(1)=1. | |
1441 | ey(2)=1. | |
1442 | ey(3)=1. | |
1443 | do i=1,4 | |
1444 | ept1(i)=ept(i)-ep3(i) | |
1445 | enddo | |
1446 | call psdefrot(ep3,s0xh,c0xh,s0h,c0h) | |
1447 | call psrotat(ep3,s0xh,c0xh,s0h,c0h) | |
1448 | s2new=psnorm(ept1)+qq | |
1449 | ||
1450 | if((long.ne.0.or.q2.ge.qq).and.iqcnew.ne.0)then | |
1451 | xmm=(5.*s2min2-qq)/4.-2.*sqrt(ptnew*q2ini) | |
1452 | s2min2=1.1*(xmm+sqrt(xmm**2-(qq-ptnew)* | |
1453 | * (s2min2-qq-4.*q2ini)))/2./(1.-4.*q2ini/(s2min2-qq)) | |
1454 | endif | |
1455 | if(s2new.gt.s2min2)then | |
1456 | sds1=psdsin(q2,qq,s2new,iqcnew,long)/4.5 | |
1457 | if(iqcnew.eq.0)then | |
1458 | gb=sds1/sds | |
1459 | else | |
1460 | if(ish.ge.8)write (ifch,*)'q2,qq,s2new',q2,qq,s2new | |
1461 | sdn1=psdnsi(q2,qq,s2new,long) | |
1462 | if(iabs(iqcnew).eq.1.or.iabs(iqcnew).eq.4)then | |
1463 | sdn1=sdn1/2.25 | |
1464 | sdv=sdv0+sdn0/2.25 | |
1465 | else | |
1466 | sdn1=sdn1/9. | |
1467 | sdv=sdv0+sdn0/9. | |
1468 | endif | |
1469 | gb=.9999*(sds1+sdn1)/sdv | |
1470 | endif | |
1471 | if(ish.ge.3.and.gb.gt.1..and.ish.ge.1)write(ifmt,*)'gbs2',gb | |
1472 | if(rangen().gt.gb)goto 14 | |
1473 | else | |
1474 | goto 14 | |
1475 | endif | |
1476 | ||
1477 | call psreti(nqc,jq,1,ey,s0xh,c0xh,s0h,c0h) | |
1478 | ||
1479 | iqc(2)=iqcnew | |
1480 | if(jt.eq.1)then !current parton color connections | |
1481 | ncc(jq,2)=nqc(2) | |
1482 | elseif(jt.eq.2)then | |
1483 | ncc(jq,2)=ncc(1,2) | |
1484 | ncc(3-jq,2)=nqc(1) | |
1485 | elseif(jt.eq.3)then | |
1486 | ncc(1,2)=nqc(2) | |
1487 | elseif(jt.eq.4)then | |
1488 | ncc(1,2)=ncc(3-jq,2) | |
1489 | ncc(2,2)=0 | |
1490 | endif | |
1491 | ||
1492 | do i=1,4 | |
1493 | ept(i)=ept1(i) | |
1494 | enddo | |
1495 | if(ish.ge.3)write (ifch,*)'new jet - iqj,ncj,ep3,ept', | |
1496 | *iqj(nj),ncj(1,nj),ncj(2,nj),ep3,ept | |
1497 | c c.m. energy squared, minimal 4-momentum transfer square and gluon 4-v | |
1498 | c for the next ladder run | |
1499 | qmin(2)=q2 | |
1500 | si=s2new | |
1501 | goto 13 !next simulation step will be considered | |
1502 | ||
1503 | 15 continue | |
1504 | if(ish.ge.3)write(ifch,*)'iqc,si,qmin(2),nj:', | |
1505 | *iqc(2),si,qmin(2),nj | |
1506 | c highest virtuality subprocess in the ladder | |
1507 | c--------------------------------------- | |
1508 | gb01=0. | |
1509 | tmax=0. | |
1510 | tmin=si | |
1511 | if(iqc(2).eq.0.and.si.gt.qq+4.*max(qcmass**2,qmin(2)))then | |
1512 | qminn=max(qcmass**2,qmin(2)) | |
1513 | tmin1=2.*qminn/(1.-qq/si)/(1.+sqrt(1.-4.*qminn/(si-qq))) | |
1514 | tmin=tmin1 | |
1515 | tmax=si/2. | |
1516 | fb01=psdbom(si,si/2.,si/2.,qq,long) | |
1517 | if(long.eq.0)fb01=fb01*si/2. | |
1518 | gb01=fb01/log(qminn/qcdlam)*sngl(psuds(qminn,iqc(2)))/si**2 | |
1519 | gb0=gb01 | |
1520 | endif | |
1521 | ||
1522 | if(long.eq.0.and.qmin(2).lt.qq)then | |
1523 | tmax=max(tmax,qq) | |
1524 | tmin=max(qmin(2), | |
1525 | * 2.*q2ini/(1.-qq/si)/(1.+sqrt(1.-4.*q2ini/(si-qq)))) | |
1526 | ze=qq/si+tmin/si*(1.-qq/si) | |
1527 | xx=ze | |
1528 | qt2=tmin*(1.-ze) | |
1529 | if(qt2.lt..999*q2ini.and.ish.ge.1)write(ifmt,*)'bor-dir:qt20' | |
1530 | * ,qt2 | |
1531 | gb0=gb01+psfap(xx,iqc(2),1)/log(qt2/qcdlam) | |
1532 | * *sngl(psuds(tmin,iqc(2))/psuds(tmin,1)*psuds(qq,1)) | |
1533 | * /si*(1.-tmin*qq/si**2/ze) | |
1534 | endif | |
1535 | gb0=gb0*2. | |
1536 | ||
1537 | call psdeftr(si-qq,ept,ey) | |
1538 | ||
1539 | if(ish.ge.6)write(ifch,*)'tmin,tmax,qq,si-qq,gb0:' | |
1540 | if(ish.ge.6)write(ifch,*)tmin,tmax,qq,si-qq,psnorm(ept),gb0 | |
1541 | ||
1542 | c------------------------------------------------ | |
1543 | 16 continue | |
1544 | if(long.eq.0)then | |
1545 | t=tmin*(tmax/tmin)**rangen() | |
1546 | else | |
1547 | t=tmin+(tmax-tmin)*rangen() | |
1548 | endif | |
1549 | ||
1550 | u=si-t | |
1551 | ze=qq/si+t/si*(1.-qq/si) | |
1552 | qt2=t*(1.-ze) | |
1553 | if(t.le.qq.and.long.eq.0)then | |
1554 | xx=ze | |
1555 | gb=psfap(xx,iqc(2),1)/log(qt2/qcdlam)*sngl(psuds(t,iqc(2)) | |
1556 | * /psuds(t,1)*psuds(qq,1))/si*(1.-t*qq/si**2/ze)/gb0 | |
1557 | else | |
1558 | gb=0. | |
1559 | endif | |
1560 | ||
1561 | gb1=0. | |
1562 | if(iqc(2).eq.0..and.si.gt.qq+4.*max(qcmass**2,qmin(2)). | |
1563 | *and.qt2.gt.qcmass**2.and.t.le.si/2..and.t.ge.tmin1)then | |
1564 | fb1=psdbom(si,t,u,qq,long) | |
1565 | if(long.eq.0)fb1=fb1*t | |
1566 | gb1=fb1/log(qt2/qcdlam)*sngl(psuds(qt2,iqc(2)))/si**2/gb0 | |
1567 | c gb1=0. !??????????????????????? | |
1568 | gb=gb+gb1 | |
1569 | endif | |
1570 | ||
1571 | ||
1572 | if(ish.ge.6)write(ifch,*)'gb,t,iqc(2),si,qq,qmin(2),long:', | |
1573 | *gb,t,iqc(2),si,qq,qmin(2),long | |
1574 | if (ish.ge.1) then | |
1575 | if(gb.gt.1.)write(*,*)'gb,gb1,gb0,gb01', | |
1576 | * ',t,iqc(2),si,qq,qmin(2),long:', | |
1577 | * gb,gb1,gb0,gb01,fb1,fb01,t,iqc(2),si,qq,qmin(2),long | |
1578 | endif | |
1579 | ||
1580 | if(rangen().gt.gb)goto 16 | |
1581 | if(ish.ge.3)write(ifch,*)'born:t,qt2:',t,qt2 | |
1582 | ||
1583 | nqc(2)=0 | |
1584 | if(iqc(2).eq.0)then | |
1585 | jq=int(1.5+rangen()) | |
1586 | jq2=3-jq | |
1587 | if(rangen().gt.gb1/gb)then | |
1588 | iq1=(1+int(3.*rangen()))*(3-2*jq) | |
1589 | else | |
1590 | iq1=4*(3-2*jq) | |
1591 | endif | |
1592 | iq2=-iq1 !quark flavors | |
1593 | nqc(1)=ncc(jq,2) | |
1594 | else | |
1595 | if(iqc(2).gt.0)then | |
1596 | jq=1 | |
1597 | else | |
1598 | jq=2 | |
1599 | endif | |
1600 | jq2=jq | |
1601 | iq1=0 | |
1602 | iq2=iqc(2) | |
1603 | nqc(1)=ncc(1,2) | |
1604 | endif | |
1605 | ||
1606 | call pscs(bcos,bsin) | |
1607 | z=sngl(psutz(dble(si-qq),dble(qt2),dble(qt2))) | |
1608 | if(t.lt..5*si)z=1.-z | |
1609 | wp3=z*sqrt(si-qq) | |
1610 | wm3=qt2/wp3 | |
1611 | if(iabs(iq1).eq.4)qt2=qt2-qcmass**2 | |
1612 | qt=sqrt(qt2) | |
1613 | ep3(1)=.5*(wp3+wm3) | |
1614 | ep3(2)=.5*(wp3-wm3) | |
1615 | ep3(3)=qt*bcos | |
1616 | ep3(4)=qt*bsin | |
1617 | call psdefrot(ep3,s0xh,c0xh,s0h,c0h) | |
1618 | if(iq1.eq.0)then | |
1619 | iq2ini1=9 | |
1620 | else | |
1621 | iq2ini1=iq1 | |
1622 | endif | |
1623 | if(iq2.eq.0)then | |
1624 | iq2ini2=9 | |
1625 | else | |
1626 | iq2ini2=iq2 | |
1627 | endif | |
1628 | if(ish.ge.5)write (ifch,*)'jq,jt,iq2ini1,iq2ini2', | |
1629 | *jq,jt,iq2ini1,iq2ini2 | |
1630 | ||
1631 | if(t.lt.qq.and.iabs(iq1).ne.4)then | |
1632 | qq1=t*(1.-ze) | |
1633 | qq2=qq | |
1634 | else | |
1635 | qq1=qt2 | |
1636 | qq2=qt2 | |
1637 | endif | |
1638 | call timsh2(qq1,qq2,sqrt(si-qq),iq2ini1,iq2ini2) | |
1639 | nfprt=1 | |
1640 | call psreti(nqc,jq,nfprt,ey,s0xh,c0xh,s0h,c0h) | |
1641 | ||
1642 | if(iqc(2).eq.0)then | |
1643 | nqc(1)=ncc(3-jq,2) | |
1644 | nqc(2)=0 | |
1645 | else | |
1646 | nqc(1)=nqc(2) | |
1647 | nqc(2)=0 | |
1648 | endif | |
1649 | ||
1650 | nfprt=2 | |
1651 | call psreti(nqc,jq2,nfprt,ey,s0xh,c0xh,s0h,c0h) | |
1652 | ||
1653 | 17 continue | |
1654 | if(ish.ge.3)write (ifch,*)'nj',nj | |
1655 | if(nj.gt.0)then | |
1656 | ||
1657 | ityj(i)=30 | |
1658 | iorj(i)=nptlh | |
1659 | do n=1,nj | |
1660 | do i=1,4 | |
1661 | ep3(i)=eqj(i,n) | |
1662 | enddo | |
1663 | call pstrans(ep3,ey0,-1) !boost to the c.m. system | |
1664 | do i=1,4 | |
1665 | eqj(i,n)=ep3(i) | |
1666 | enddo | |
1667 | do l=1,6 | |
1668 | bxj(l,n)=bx(l) | |
1669 | enddo | |
1670 | ityj(n)=0 | |
1671 | iorj(n)=1 | |
1672 | enddo | |
1673 | endif | |
1674 | call psjarr(jfl) !kinky strings formation | |
1675 | if(ish.ge.3)write (ifch,*)'jfl',jfl | |
1676 | if(jfl.eq.0)then | |
1677 | iret=1 | |
1678 | else | |
1679 | iret=0 | |
1680 | ep3(4)=egyevt | |
1681 | ep3(2)=0. | |
1682 | ep3(3)=0. | |
1683 | ep3(1)=0. | |
1684 | do i=2,nptl | |
1685 | do l=1,4 | |
1686 | ep3(l)=ep3(l)-pptl(l,i) | |
1687 | enddo | |
1688 | enddo | |
1689 | if(ish.ge.3)write(ifch,*)'energy-momentum balance:' | |
1690 | if(ish.ge.3)write(ifch,*)ep3 | |
1691 | if(abs(ep3(4)).gt.3.e-2)write(*,*)'energy-momentum balance:',ep3 | |
1692 | endif | |
1693 | 9999 call utprix('psadis',ish,ishini,3) | |
1694 | return | |
1695 | end | |
1696 | ||
1697 | c----------------------------------------------------------------------- | |
1698 | subroutine psaevc | |
1699 | c----------------------------------------------------------------------- | |
1700 | include 'epos.inc' | |
1701 | c structure functions calculation | |
1702 | logical lcalc | |
1703 | double precision xx,xmax | |
1704 | dimension evs(21,21,135) | |
1705 | common /psar2/ edmax,epmax | |
1706 | common /psar31/ evk0(21,21,54) | |
1707 | common /psar32/ evk(21,21,135) | |
1708 | include 'epos.incsem' | |
1709 | ||
1710 | inquire(file=fnie(1:nfnie),exist=lcalc) | |
1711 | if(lcalc)then | |
1712 | if(inicnt.eq.1)then | |
1713 | write(ifmt,'(3a)')'read from ',fnie(1:nfnie),' ...' | |
1714 | open(1,file=fnie(1:nfnie),status='old') | |
1715 | read (1,*)qcdlam0,q2min0,q2ini0,naflav0,epmax0 | |
1716 | if(qcdlam0.ne.qcdlam)write(ifmt,'(a)')'iniev: wrong qcdlam' | |
1717 | if(q2min0 .ne.q2min )write(ifmt,'(a)')'iniev: wrong q2min' | |
1718 | if(q2ini0 .ne.q2ini )write(ifmt,'(a)')'iniev: wrong q2ini' | |
1719 | if(naflav0.ne.naflav)write(ifmt,'(a)')'iniev: wrong naflav' | |
1720 | if(epmax0 .ne.epmax )write(ifmt,'(a)')'iniev: wrong epmax' | |
1721 | if(qcdlam0.ne.qcdlam.or.q2min0.ne.q2min.or.q2ini0.ne.q2ini | |
1722 | * .or.naflav0.ne.naflav.or.epmax0.ne.epmax)then | |
1723 | write(6,'(//a//)')' iniev has to be reinitialized!!!' | |
1724 | stop | |
1725 | endif | |
1726 | read (1,*)evk0,evk | |
1727 | close(1) | |
1728 | endif | |
1729 | goto 101 | |
1730 | endif | |
1731 | ||
1732 | write(ifmt,'(a)')'iniev does not exist -> calculate tables ...' | |
1733 | xmax=1.d0-2.d0*q2ini/epmax | |
1734 | do l=1,27 | |
1735 | if(l.le.12)then | |
1736 | xx=.1d0*exp(l-13.d0) | |
1737 | elseif(l.le.21)then | |
1738 | xx=.1d0*(l-12.d0) | |
1739 | else | |
1740 | xx=1.d0-.1d0*(10.d0*(1.d0-xmax))**((l-21)/6.) | |
1741 | endif | |
1742 | ||
1743 | qmin=max(1.d0*q2min,q2ini/(1.-xx)) | |
1744 | do i=1,21 | |
1745 | qq=qmin*(.5*epmax/qmin)**((i-1)/20.) | |
1746 | do j=1,21 | |
1747 | qj=qmin*(qq/qmin)**((j-1)/20.) | |
1748 | if(l.eq.27.or.i.eq.1.or.j.eq.21)then | |
1749 | evk0(i,j,l)=0. | |
1750 | evk0(i,j,l+27)=0. | |
1751 | do k=1,5 | |
1752 | evk(i,j,l+27*(k-1))=0. | |
1753 | enddo | |
1754 | else | |
1755 | do k=1,2 | |
1756 | evk0(i,j,l+27*(k-1))=log(psev0(qj,qq,xx,k)) | |
1757 | enddo | |
1758 | endif | |
1759 | enddo | |
1760 | enddo | |
1761 | enddo | |
1762 | ||
1763 | n=1 | |
1764 | ||
1765 | 1 n=n+1 | |
1766 | write(ifmt,2)n | |
1767 | 2 format(5x,i2,'-th order contribution') | |
1768 | ||
1769 | do l=1,26 | |
1770 | write(ifmt,*)'l',l | |
1771 | if(l.le.12)then | |
1772 | xx=.1d0*exp(l-13.d0) | |
1773 | elseif(l.le.21)then | |
1774 | xx=.1d0*(l-12.d0) | |
1775 | else | |
1776 | xx=1.d0-.1d0*(10.d0*(1.d0-xmax))**((l-21)/6.) | |
1777 | endif | |
1778 | ||
1779 | qmin=max(1.d0*q2min,q2ini/(1.d0-xx)) | |
1780 | do i=2,21 | |
1781 | qq=qmin*(.5*epmax/qmin)**((i-1)/20.) | |
1782 | do j=1,20 | |
1783 | qj=qmin*(qq/qmin)**((j-1)/20.) | |
1784 | do m=1,3 | |
1785 | do k=1,2 | |
1786 | if(m.ne.3)then | |
1787 | ev=psev(qj,qq,xx,m,k,n) | |
1788 | ev0=psevi0(qj,qq,xx,m,k) | |
1789 | evs(i,j,l+27*(m-1)+54*(k-1))=log((ev+ev0)/psfap(xx,m-1,k-1) | |
1790 | * /log(log(qq*(1.d0-xx)/qcdlam)/log(qj*(1.d0-xx)/qcdlam))*4.5) | |
1791 | elseif(k.ne.1)then | |
1792 | evs(i,j,l+108)=log((psev(qj,qq,xx,m,k,n)+ | |
1793 | * psevi0(qj,qq,xx,2,2))/psfap(xx,2,2) | |
1794 | * /log(log(qq*(1.d0-xx)/qcdlam)/log(qj*(1.d0-xx)/qcdlam))*4.5) | |
1795 | endif | |
1796 | enddo | |
1797 | enddo | |
1798 | enddo | |
1799 | enddo | |
1800 | enddo | |
1801 | ||
1802 | jec=0 | |
1803 | do i=2,21 | |
1804 | do j=1,20 | |
1805 | do l=1,26 | |
1806 | do k=1,5 | |
1807 | if(n.eq.2.or.evs(i,j,l+27*(k-1)).ne.0..and. | |
1808 | * abs(1.-evk(i,j,l+27*(k-1))/evs(i,j,l+27*(k-1))).gt.1.e-2)then | |
1809 | jec=1 | |
1810 | evk(i,j,l+27*(k-1))=evs(i,j,l+27*(k-1)) | |
1811 | endif | |
1812 | enddo | |
1813 | enddo | |
1814 | enddo | |
1815 | enddo | |
1816 | ||
1817 | if(jec.ne.0)goto 1 | |
1818 | ||
1819 | write(ifmt,'(a)')'write to iniev ...' | |
1820 | open(1,file=fnie(1:nfnie),status='unknown') | |
1821 | write (1,*)qcdlam,q2min,q2ini,naflav,epmax | |
1822 | write (1,*)evk0,evk | |
1823 | close(1) | |
1824 | ||
1825 | 101 continue | |
1826 | return | |
1827 | end | |
1828 | ||
1829 | c------------------------------------------------------------------------ | |
1830 | function psdbom(s,t,u,qq,long) | |
1831 | c----------------------------------------------------------------------- | |
1832 | c psdbom - integrand for DIS c-quark cross-sections (matrix element squared) | |
1833 | c s - total c.m. energy squared for the scattering (for n=2: s+qq), | |
1834 | c t - invariant variable for the scattering |(p1-p3)**2| | |
1835 | c u - invariant variable for the scattering |(p1-p4)**2| | |
1836 | c qq - photon virtuality | |
1837 | c long: 0 - contr. to (F2-F_L), 1 - contr. to F_L | |
1838 | c----------------------------------------------------------------------- | |
1839 | include 'epos.incsem' | |
1840 | if(long.eq.0)then !F2-F_L | |
1841 | psdbom=(2.*(t/u+u/t)*(qq**2+(s-qq)**2)/s**2+ | |
1842 | * 4.*(qcmass*s/t/u)**2*(qq-2.*qcmass**2)+ | |
1843 | * 8.*qcmass**2/t/u*(s-2.*qq)) *2. !=4.5/2.25 | |
1844 | else !F_L_C | |
1845 | psdbom=16.*qq*((s-qq)/s**2-qcmass**2/t/u) *2. !=4.5/2.25 | |
1846 | endif | |
1847 | return | |
1848 | end | |
1849 | ||
1850 | c------------------------------------------------------------------------ | |
1851 | function psdbin(q1,qq,s,m1,long) | |
1852 | c----------------------------------------------------------------------- | |
1853 | c psdbin - DIS born cross-section | |
1854 | c q1 - virtuality cutoff for current end of the ladder | |
1855 | c qq - photon virtuality | |
1856 | c s=2(pq) - s_true + qq | |
1857 | c s2min - mass cutoff for born scattering | |
1858 | c m1 - incoming parton type (0 - g, 1,2 - q) | |
1859 | c----------------------------------------------------------------------- | |
1860 | double precision xx | |
1861 | include 'epos.incsem' | |
1862 | include 'epos.inc' | |
1863 | ||
1864 | psdbin=0. | |
1865 | q2mass=qcmass**2 | |
1866 | s2min=4.*max(q1,q2mass)+qq | |
1867 | if(m1.eq.0.and.s.gt.s2min.and.(idisco.eq.0.or.idisco.eq.2))then | |
1868 | tmax=s/2. | |
1869 | qtq=4.*max(q2mass,q1)/(s-qq) | |
1870 | if(qtq.lt.1.)then | |
1871 | tmin=.5*s*qtq/(1.+sqrt(1.-qtq)) | |
1872 | else | |
1873 | tmin=.5*s | |
1874 | endif | |
1875 | psdbin=psdbin+psdbor(q1,qq,s,long)*(1./tmin-1./tmax) | |
1876 | endif | |
1877 | ||
1878 | if(long.eq.0.and.q1.lt.qq.and.s.gt.qq/(1.-q2ini/qq) | |
1879 | *.and.(idisco.eq.0.or.idisco.eq.1))then | |
1880 | m=min(1,iabs(m1))+1 | |
1881 | xx=qq/s | |
1882 | psdbin=psdbin+psevi0(q1,qq,xx,m,2)*4.*pi**2*alfe/s | |
1883 | endif | |
1884 | return | |
1885 | end | |
1886 | ||
1887 | c------------------------------------------------------------------------ | |
1888 | function psdbor(q1,qq,s,long) | |
1889 | c----------------------------------------------------------------------- | |
1890 | c psdbor - DIS born cross-section | |
1891 | c q1 - virtuality cutoff for current end of the ladder | |
1892 | c qq - photon virtuality | |
1893 | c s=2(pq) - s_true + qq | |
1894 | c s2min - mass cutoff for born scattering | |
1895 | c----------------------------------------------------------------------- | |
1896 | common /ar3/ x1(7),a1(7) | |
1897 | include 'epos.inc' | |
1898 | include 'epos.incsem' | |
1899 | double precision psuds | |
1900 | ||
1901 | psdbor=0. | |
1902 | q2mass=qcmass**2 | |
1903 | qtq=4.*max(q2mass,q1)/(s-qq) | |
1904 | j=0 !Gluon | |
1905 | ||
1906 | tmax=s/2. | |
1907 | if(qtq.lt.1.)then | |
1908 | tmin=.5*s*qtq/(1.+sqrt(1.-qtq)) | |
1909 | else | |
1910 | tmin=.5*s | |
1911 | endif | |
1912 | if(tmax.lt.tmin.and.ish.ge.1)write(ifmt,*)'s,q1,qq,tmin,tmax', | |
1913 | *s,q1,qq,tmin,tmax | |
1914 | ||
1915 | ft=0. | |
1916 | do i=1,7 | |
1917 | do m=1,2 | |
1918 | t=2.*tmin/(1.+tmin/tmax+(2*m-3)*x1(i)*(1.-tmin/tmax)) | |
1919 | u=s-t | |
1920 | ||
1921 | qt=t*u/s*(1.-qq/s) | |
1922 | if(qt.lt..999*max(q2mass,q1).and.ish.ge.1) | |
1923 | & write(ifmt,*)'psdbor:qt,q1',qt,q1 | |
1924 | fb=psdbom(s,t,u,qq,long)*t**2 | |
1925 | ft=ft+a1(i)*fb*pssalf(qt/qcdlam)*sngl(psuds(qt,j)) | |
1926 | enddo | |
1927 | enddo | |
1928 | psdbor=ft/s**2*pi**2*alfe/sngl(psuds(q1,j)) | |
1929 | return | |
1930 | end | |
1931 | ||
1932 | c------------------------------------------------------------------------ | |
1933 | subroutine psdint(s,qq,sds,sdn,sdb,sdt,sdr,m1,long) | |
1934 | c----------------------------------------------------------------------- | |
1935 | c psdint - dis cross-sections interpolation - for minimal | |
1936 | c effective momentum cutoff in the ladder | |
1937 | c s - total c.m. energy squared for the ladder, | |
1938 | c qq - photon virtuality, | |
1939 | c sds - dis singlet cross-section, | |
1940 | c sdn - dis nonsinglet cross-section, | |
1941 | c sdb - dis born cross-section, | |
1942 | c sdt - dis singlet+resolved cross-section, | |
1943 | c m1 - parton type at current end of the ladder (0 - g, 1,2 - q) | |
1944 | c----------------------------------------------------------------------- | |
1945 | double precision xx | |
1946 | dimension wk(3),wj(3) | |
1947 | common /psar2/ edmax,epmax | |
1948 | common /psar27/ csds(21,26,4),csdt(21,26,2),csdr(21,26,2) | |
1949 | include 'epos.incsem' | |
1950 | include 'epos.inc' | |
1951 | ||
1952 | sds=0. | |
1953 | sdn=0. | |
1954 | sdt=0. | |
1955 | sdr=0. | |
1956 | sdb=psdbin(q2min,qq,s,m1,long) | |
1957 | ||
1958 | m=min(1,iabs(m1))+1 | |
1959 | qlj=log(qq/q2min)*2.+1. | |
1960 | j=int(qlj) | |
1961 | if(j.lt.1)j=1 | |
1962 | if(j.gt.19)j=19 | |
1963 | wj(2)=qlj-j | |
1964 | wj(3)=wj(2)*(wj(2)-1.)*.5 | |
1965 | wj(1)=1.-wj(2)+wj(3) | |
1966 | wj(2)=wj(2)-2.*wj(3) | |
1967 | ||
1968 | s2min=4.*max(q2min,qcmass**2)+qq | |
1969 | if(m1.ne.0)s2min=s2min/(1.-4.*q2ini/(s2min-qq)) | |
1970 | if(s.le.s2min.or.idisco.ne.0.and.idisco.ne.2)goto 1 | |
1971 | ||
1972 | qtq=4.*max(q2min,qcmass**2)/(s-qq) | |
1973 | if(qtq.lt.1.)then | |
1974 | tmin=.5*s*qtq/(1.+sqrt(1.-qtq)) | |
1975 | else | |
1976 | tmin=.5*s | |
1977 | endif | |
1978 | tmax=s/2. | |
1979 | ||
1980 | sl=log(s/s2min)/log(edmax/s2min)*25.+1. | |
1981 | k=int(sl) | |
1982 | if(k.lt.1)k=1 | |
1983 | if(k.gt.24)k=24 | |
1984 | wk(2)=sl-k | |
1985 | wk(3)=wk(2)*(wk(2)-1.)*.5 | |
1986 | wk(1)=1.-wk(2)+wk(3) | |
1987 | wk(2)=wk(2)-2.*wk(3) | |
1988 | ||
1989 | do k1=1,3 | |
1990 | k2=k+k1-1 | |
1991 | do j1=1,3 | |
1992 | sds=sds+csds(j+j1-1,k2,m+2*long)*wj(j1)*wk(k1) | |
1993 | enddo | |
1994 | enddo | |
1995 | if(m.eq.1)then | |
1996 | sds=exp(sds)*(1./tmin-1./tmax) | |
1997 | else | |
1998 | sds=max(sds,0.) | |
1999 | endif | |
2000 | ||
2001 | 1 continue | |
2002 | s2min=max(4.*qq,16.*q2min)+qq | |
2003 | if(s.le.s2min.or.long.ne.0.or.idisco.ne.0.and.idisco.ne.3)then | |
2004 | sdt=sds | |
2005 | goto 2 | |
2006 | endif | |
2007 | ||
2008 | sl=log(s/s2min)/log(edmax/s2min)*25.+1. | |
2009 | k=int(sl) | |
2010 | if(k.lt.1)k=1 | |
2011 | if(k.gt.24)k=24 | |
2012 | wk(2)=sl-k | |
2013 | wk(3)=wk(2)*(wk(2)-1.)*.5 | |
2014 | wk(1)=1.-wk(2)+wk(3) | |
2015 | wk(2)=wk(2)-2.*wk(3) | |
2016 | ||
2017 | do k1=1,3 | |
2018 | k2=k+k1-1 | |
2019 | do j1=1,3 | |
2020 | sdr=sdr+csdr(j+j1-1,k2,m)*wj(j1)*wk(k1) | |
2021 | sdt=sdt+csdt(j+j1-1,k2,m)*wj(j1)*wk(k1) | |
2022 | enddo | |
2023 | enddo | |
2024 | ||
2025 | sdr=max(sdr,0.) | |
2026 | sdt=max(sds,sds+sdt) | |
2027 | sdt=sdt+sdr | |
2028 | ||
2029 | 2 continue | |
2030 | if(long.eq.0.and.q2min.lt.qq.and.s.gt.qq/(1.-q2ini/qq) | |
2031 | *.and.(idisco.eq.0.or.idisco.eq.1))then | |
2032 | xx=qq/s | |
2033 | dsi=psevi(q2min,qq,xx,m,2)*4.*pi**2*alfe/s | |
2034 | if(m1.eq.0)then | |
2035 | sds=sds+dsi | |
2036 | sdt=sdt+dsi | |
2037 | else | |
2038 | dnsi=psevi(q2min,qq,xx,3,2)*4.*pi**2*alfe/s | |
2039 | sdn=sdn+dnsi | |
2040 | sds=sds+max(dsi-dnsi,0.) | |
2041 | sdt=sdt+max(dsi-dnsi,0.) | |
2042 | endif | |
2043 | endif | |
2044 | ||
2045 | if(m1.eq.0)then | |
2046 | sds=max(sds,sdb) | |
2047 | sdt=max(sdt,sdb) | |
2048 | else | |
2049 | sdn=max(sdn,sdb) | |
2050 | endif | |
2051 | return | |
2052 | end | |
2053 | ||
2054 | c----------------------------------------------------------------------- | |
2055 | function psdnsi(q1,qq,s,long) | |
2056 | c----------------------------------------------------------------------- | |
2057 | c psdnsi - DIS nonsinglet cross-section interpolation | |
2058 | c q1 - effective momentum cutoff for current end of the ladder, | |
2059 | c qq - photon virtuality, | |
2060 | c s - total c.m. energy squared for the ladder, | |
2061 | c----------------------------------------------------------------------- | |
2062 | double precision xx | |
2063 | include 'epos.incsem' | |
2064 | include 'epos.inc' | |
2065 | ||
2066 | psdnsi=0. | |
2067 | if(long.eq.0.and.q1.lt.qq.and.s.gt.qq/(1.-q2ini/qq))then | |
2068 | xx=qq/s | |
2069 | psdnsi=psdnsi+max(0.,psevi(q1,qq,xx,3,2)*4.*pi**2*alfe/s) | |
2070 | endif | |
2071 | return | |
2072 | end | |
2073 | ||
2074 | c----------------------------------------------------------------------- | |
2075 | function psdrga(qq,s,s2min,j) | |
2076 | c----------------------------------------------------------------------- | |
2077 | c psdrga - DIS resolved cross-section (photon sf) | |
2078 | c qq - photon virtuality | |
2079 | c s - total c.m. energy squared for the process | |
2080 | c s2min - mass cutoff for born scattering | |
2081 | c j - parton type at current end of the ladder (0 - g, 1,2 etc. - q) | |
2082 | c----------------------------------------------------------------------- | |
2083 | common /ar3/ x1(7),a1(7) | |
2084 | include 'epos.incsem' | |
2085 | ||
2086 | psdrga=0. | |
2087 | if(s.le.s2min)return | |
2088 | ||
2089 | xmin=s2min/s | |
2090 | do i=1,7 | |
2091 | do m=1,2 | |
2092 | z=xmin**(.5+(m-1.5)*x1(i)) | |
2093 | tu=psdfh4(z,q2min,qq,0,1) | |
2094 | td=psdfh4(z,q2min,qq,0,2) | |
2095 | ts=psdfh4(z,q2min,qq,0,3) | |
2096 | tg=psdfh4(z,q2min,qq,0,0) | |
2097 | if(j.eq.0)then | |
2098 | sj=tg*psjti(q2min,qq,z*s,0,j,1)+ | |
2099 | * (tu+td+ts)*psjti(q2min,qq,z*s,1,j,1) | |
2100 | else | |
2101 | sj=tg*psjti(q2min,qq,z*s,0,j,1)+ | |
2102 | * (tu+td)*(psjti(q2min,qq,z*s,1,1,1)/4.+ | |
2103 | * psjti(q2min,qq,z*s,-1,1,1)/4.+ | |
2104 | * psjti(q2min,qq,z*s,2,1,1)/2.)+ | |
2105 | * ts*psjti(q2min,qq,z*s,2,1,1) | |
2106 | endif | |
2107 | psdrga=psdrga+a1(i)*sj | |
2108 | enddo | |
2109 | enddo | |
2110 | psdrga=-psdrga*log(xmin)*alfe/2. *4.5 !mean e^2 is taken out | |
2111 | return | |
2112 | end | |
2113 | ||
2114 | c----------------------------------------------------------------------- | |
2115 | function psdres(qq,s,s2min,j) | |
2116 | c----------------------------------------------------------------------- | |
2117 | c psdres - DIS resolved photon cross-section | |
2118 | c qq - photon virtuality | |
2119 | c s - total w squared for the ladder (s+qq) | |
2120 | c s2min - mass cutoff for born scattering | |
2121 | c j - parton type at current end of the ladder (0 - g, 1,2 etc. - q) | |
2122 | c----------------------------------------------------------------------- | |
2123 | double precision xx | |
2124 | common /ar3/ x1(7),a1(7) | |
2125 | include 'epos.inc' | |
2126 | include 'epos.incsem' | |
2127 | ||
2128 | psdres=0. | |
2129 | if(s.le.s2min+qq)return | |
2130 | ||
2131 | qmin=max(q2min,s2min/(s/qq-1.)) | |
2132 | qmax=min(s-s2min,s/2.) | |
2133 | ||
2134 | c numerical integration over transverse momentum squared; | |
2135 | c gaussian integration is used | |
2136 | do i=1,7 | |
2137 | do m=1,2 | |
2138 | qi=2.*qmin/(1.+qmin/qmax+(2*m-3)*x1(i)*(1.-qmin/qmax)) | |
2139 | ||
2140 | zmax=min(1.,qi/qq) | |
2141 | zmin=(max(qi,s2min)+qi)/s | |
2142 | ||
2143 | fsj=0. | |
2144 | if(zmax.gt.zmin)then | |
2145 | do i1=1,7 | |
2146 | do m1=1,2 | |
2147 | z=.5*(zmax+zmin+(2*m1-3)*x1(i1)*(zmax-zmin)) | |
2148 | s2=z*s-qi | |
2149 | xx=z | |
2150 | if(j.eq.0)then | |
2151 | sj=psfap(xx,0,1)*psjti(qi,qq,s2,1,j,1) | |
2152 | else | |
2153 | sj=psfap(xx,0,1)*(psjti(qi,qq,s2,1,1,1)/6.+ | |
2154 | * psjti(qi,qq,s2,-1,1,1)/6.+ | |
2155 | * psjti(qi,qq,s2,2,1,1)/1.5) | |
2156 | endif | |
2157 | fsj=fsj+a1(i1)*sj*qi !????????(qi-z*qq) | |
2158 | enddo | |
2159 | enddo | |
2160 | fsj=fsj*(zmax-zmin) | |
2161 | elseif(ish.ge.1)then | |
2162 | write(ifmt,*)'psdres:zmax,zmin',zmax,zmin | |
2163 | endif | |
2164 | psdres=psdres+a1(i)*fsj | |
2165 | enddo | |
2166 | enddo | |
2167 | psdres=psdres*(1./qmin-1./qmax)*alfe*.75/pi !alpha_s -> 6 alpha_e | |
2168 | return | |
2169 | end | |
2170 | ||
2171 | c------------------------------------------------------------------------ | |
2172 | function psds(q1,qq,s,j,long) | |
2173 | c----------------------------------------------------------------------- | |
2174 | c psds - DIS singlet cross-section | |
2175 | c q1 - virtuality cutoff for current end of the ladder | |
2176 | c qq - photon virtuality | |
2177 | c s=2(pq) - s_true + qq | |
2178 | c s2min - mass cutoff for born scattering | |
2179 | c----------------------------------------------------------------------- | |
2180 | double precision xxe,xmax,xmin,xmax1,xmin1 | |
2181 | common /ar3/ x1(7),a1(7) | |
2182 | include 'epos.inc' | |
2183 | include 'epos.incsem' | |
2184 | ||
2185 | psds=0. | |
2186 | q2mass=qcmass**2 | |
2187 | s2min=4.*max(q1,q2mass) | |
2188 | smin=(s2min+qq)/(1.-4.*q2ini/s2min) | |
2189 | if(s.le.1.001*smin)return | |
2190 | ||
2191 | xmax=.5d0*(1.d0+qq/s+dsqrt((1.d0-qq/s)**2-16.d0*q2ini/s)) | |
2192 | xmin=max(1.d0+qq/s-xmax,1.d0*(s2min+qq)/s) | |
2193 | if(xmin.gt.xmax.and.ish.ge.1)write(ifmt,*)'xmin,xmax,q1,qq,s,smin' | |
2194 | *,xmin,xmax,q1,qq,s,smin | |
2195 | ||
2196 | fx1=0. | |
2197 | fx2=0. | |
2198 | if(xmax.gt..9d0)then | |
2199 | xmin1=max(xmin,.9d0) | |
2200 | do i=1,7 | |
2201 | do m=1,2 | |
2202 | xxe=1.d0-(1.d0-xmax)*((1.d0-xmin1)/(1.d0-xmax))** | |
2203 | * (.5d0-x1(i)*(m-1.5)) | |
2204 | xx=xxe | |
2205 | ||
2206 | sh=xx*s | |
2207 | qtmin=max(1.d0*max(q2mass,q1),q2ini/(1.d0-xxe)) | |
2208 | qtq=4.*qtmin/(sh-qq) | |
2209 | ||
2210 | tmin=.5*sh*qtq/(1.+sqrt(1.-qtq)) | |
2211 | tmax=.5*sh | |
2212 | if(tmin.gt.tmax.and.ish.ge.1)write(ifmt,*)'psds:tmin,tmax' | |
2213 | & ,tmin,tmax | |
2214 | ||
2215 | ft=0. | |
2216 | do i1=1,7 | |
2217 | do m1=1,2 | |
2218 | t=.5*(tmin+tmax+(2*m1-3)*x1(i1)*(tmin-tmax)) | |
2219 | u=sh-t | |
2220 | qt=t*u/sh*(1.-qq/sh) | |
2221 | if(qt.lt.qtmin.and.ish.ge.1)write(ifmt,*)'psds:qt,qtmin' | |
2222 | & ,qt,qtmin | |
2223 | ||
2224 | fb=psdsj(q1,xxe,sh,qt,t,u,qq,j,long) | |
2225 | ft=ft+a1(i1)*fb*pssalf(qt/qcdlam) | |
2226 | enddo | |
2227 | enddo | |
2228 | ft=ft*(tmax-tmin) | |
2229 | fx1=fx1+a1(i)*ft*(1.-xx)/sh**2 | |
2230 | enddo | |
2231 | enddo | |
2232 | fx1=fx1*log((1.d0-xmin1)/(1.d0-xmax)) | |
2233 | endif | |
2234 | ||
2235 | if(xmin.lt..9d0)then | |
2236 | xmax1=min(xmax,.9d0) | |
2237 | do i=1,7 | |
2238 | do m=1,2 | |
2239 | xxe=xmin*(xmax1/xmin)**(.5-x1(i)*(m-1.5)) | |
2240 | xx=xxe | |
2241 | ||
2242 | sh=xx*s | |
2243 | qtmin=max(1.d0*max(q2mass,q1),q2ini/(1.d0-xxe)) | |
2244 | qtq=4.*qtmin/(sh-qq) | |
2245 | ||
2246 | tmin=.5*sh*qtq/(1.+sqrt(1.-qtq)) | |
2247 | tmax=.5*sh | |
2248 | if(tmin.gt.tmax.and.ish.ge.1)write(ifmt,*)'psds:tmin,tmax' | |
2249 | * ,tmin,tmax | |
2250 | ||
2251 | ft=0. | |
2252 | do i1=1,7 | |
2253 | do m1=1,2 | |
2254 | t=(.5*(tmin+tmax+(2*m1-3)*x1(i1)* | |
2255 | * (tmin-tmax))) | |
2256 | u=sh-t | |
2257 | qt=t*u/sh*(1.-qq/sh) | |
2258 | if(qt.lt.qtmin.and.ish.ge.1)write(ifmt,*)'psds:qt,qtmin' | |
2259 | * ,qt,qtmin | |
2260 | ||
2261 | fb=psdsj(q1,xxe,sh,qt,t,u,qq,j,long) | |
2262 | ft=ft+a1(i1)*fb*pssalf(qt/qcdlam) | |
2263 | enddo | |
2264 | enddo | |
2265 | ft=ft*(tmax-tmin) | |
2266 | fx2=fx2+a1(i)*ft*xx/sh**2 | |
2267 | enddo | |
2268 | enddo | |
2269 | fx2=fx2*log(xmax1/xmin) | |
2270 | endif | |
2271 | psds=(fx1+fx2)*pi**2*alfe | |
2272 | return | |
2273 | end | |
2274 | ||
2275 | c----------------------------------------------------------------------- | |
2276 | function psdsj(q1,xx,s,qt,t,u,qq,j,long) | |
2277 | c----------------------------------------------------------------------- | |
2278 | c psdsj - integrand for dis singlet cross-section | |
2279 | c q1 - virtuality cutoff for current end of the ladder | |
2280 | c xx - lc momentum ratio between initial (j) and final (l) partons | |
2281 | c s - c.m. energy squared for the born scattering, | |
2282 | c t - invariant variable for the born scattering |(p1-p3)**2| | |
2283 | c u - invariant variable for the born scattering |(p1-p4)**2| | |
2284 | c qq - photon virtuality | |
2285 | c j - initial parton at the end of the ladder (0 - g, 1,2 - q) | |
2286 | c----------------------------------------------------------------------- | |
2287 | double precision xx | |
2288 | include 'epos.incsem' | |
2289 | ||
2290 | fb=psdbom(s,t,u,qq,long) | |
2291 | psdsj=psevi(q1,qt,xx,min(1,iabs(j))+1,1)*fb | |
2292 | return | |
2293 | end | |
2294 | ||
2295 | c------------------------------------------------------------------------ | |
2296 | function psdsin(q1,qq,s,m1,long) | |
2297 | c----------------------------------------------------------------------- | |
2298 | c psdsin - DIS singlet cross-section interpolation | |
2299 | c q1 - effective momentum cutoff for current end of the ladder, | |
2300 | c qq - photon virtuality, | |
2301 | c s - total c.m. energy squared for the ladder, | |
2302 | c m1 - parton type at current end of the ladder (0 - g, 1,2 - q) | |
2303 | c----------------------------------------------------------------------- | |
2304 | double precision xx | |
2305 | dimension wi(3),wj(3),wk(3) | |
2306 | common /psar2/ edmax,epmax | |
2307 | common /psar25/ csdsi(21,21,104) | |
2308 | include 'epos.incsem' | |
2309 | include 'epos.inc' | |
2310 | ||
2311 | psdsin=0. | |
2312 | m=min(1,iabs(m1))+1 | |
2313 | ||
2314 | q2mass=qcmass**2 | |
2315 | s2min=4.*max(q2min,q2mass)+qq | |
2316 | sdmin=4.*max(q1,q2mass)+qq | |
2317 | if(m1.ne.0)then | |
2318 | s2min=s2min/(1.-4.*q2ini/(s2min-qq)) | |
2319 | sdmin=sdmin/(1.-4.*q2ini/(sdmin-qq)) | |
2320 | endif | |
2321 | c if(s.le.1.e8*sdmin)goto 2 !???????????????? | |
2322 | if(s.le.sdmin)goto 2 | |
2323 | ||
2324 | qmin=q2min | |
2325 | qmax=(s-qq)/4. | |
2326 | if(m1.ne.0)qmax=(s-qq+sqrt((s-qq)**2-16.*s*q2ini))/8. | |
2327 | qtq=4.*max(q2mass,q1)/(s-qq) | |
2328 | if(qtq.lt.1.)then | |
2329 | tmin=.5*s*qtq/(1.+sqrt(1.-qtq)) | |
2330 | else | |
2331 | tmin=.5*s | |
2332 | endif | |
2333 | tmax=s/2. | |
2334 | ||
2335 | qlj=log(qq/q2min)*2.+1. | |
2336 | j=int(qlj) | |
2337 | if(j.lt.1)j=1 | |
2338 | if(j.gt.19)j=19 | |
2339 | wj(2)=qlj-j | |
2340 | wj(3)=wj(2)*(wj(2)-1.)*.5 | |
2341 | wj(1)=1.-wj(2)+wj(3) | |
2342 | wj(2)=wj(2)-2.*wj(3) | |
2343 | ||
2344 | qli=log(q1/qmin)/log(qmax/qmin)*20.+1. | |
2345 | i=int(qli) | |
2346 | if(i.lt.1)i=1 | |
2347 | if(i.gt.19)i=19 | |
2348 | wi(2)=qli-i | |
2349 | wi(3)=wi(2)*(wi(2)-1.)*.5 | |
2350 | wi(1)=1.-wi(2)+wi(3) | |
2351 | wi(2)=wi(2)-2.*wi(3) | |
2352 | ||
2353 | sl=log(s/s2min)/log(edmax/s2min)*25.+1. | |
2354 | k=int(sl) | |
2355 | if(k.lt.1)k=1 | |
2356 | if(k.gt.24)k=24 | |
2357 | wk(2)=sl-k | |
2358 | wk(3)=wk(2)*(wk(2)-1.)*.5 | |
2359 | wk(1)=1.-wk(2)+wk(3) | |
2360 | wk(2)=wk(2)-2.*wk(3) | |
2361 | ||
2362 | dsin1=0. | |
2363 | do k1=1,3 | |
2364 | k2=k+k1-1+26*(m-1)+52*long | |
2365 | do i1=1,3 | |
2366 | do j1=1,3 | |
2367 | dsin1=dsin1+csdsi(i+i1-1,j+j1-1,k2)*wi(i1)*wj(j1)*wk(k1) | |
2368 | enddo | |
2369 | enddo | |
2370 | enddo | |
2371 | if(m1.eq.0)then | |
2372 | psdsin=psdsin+exp(dsin1)*(1./tmin-1./tmax) | |
2373 | else | |
2374 | psdsin=psdsin+max(0.,dsin1) | |
2375 | endif | |
2376 | ||
2377 | 2 continue | |
2378 | if(long.eq.0.and.q1.lt.qq.and.s.gt.qq/(1.-q2ini/qq))then | |
2379 | xx=qq/s | |
2380 | dsi=psevi(q1,qq,xx,m,2)*4.*pi**2*alfe/s | |
2381 | if(m1.eq.0)then | |
2382 | psdsin=psdsin+max(dsi,0.) | |
2383 | else | |
2384 | dnsi=psevi(q1,qq,xx,3,2)*4.*pi**2*alfe/s | |
2385 | psdsin=psdsin+max(dsi-dnsi,0.) | |
2386 | endif | |
2387 | endif | |
2388 | return | |
2389 | end | |
2390 | ||
2391 | ||
2392 | ||
2393 | ||
2394 | ||
2395 | ||
2396 | ||
2397 | ||
2398 | ||
2399 | ||
2400 | ||
2401 | ||
2402 | ||
2403 | ||
2404 | c########################################################################### | |
2405 | c########################################################################### | |
2406 | c########################################################################### | |
2407 | c########################################################################### | |
2408 | c | |
2409 | c unused 3P | |
2410 | c | |
2411 | c########################################################################### | |
2412 | c########################################################################### | |
2413 | c########################################################################### | |
2414 | c########################################################################### | |
2415 | ||
2416 | ||
2417 | c------------------------------------------------------------------------ | |
2418 | function psvy(xpp0,xpr0,xpm0,xmr0,b,iqq) | |
2419 | c----------------------------------------------------------------------- | |
2420 | c psvy - 3p-contributions to the interaction eikonal | |
2421 | c xpp - lc+ for the pomeron, | |
2422 | c xpr - lc+ for the remnant, | |
2423 | c xpm - lc- for the pomeron, | |
2424 | c xpr - lc- for the remnant, | |
2425 | c b - impact parameter, | |
2426 | c iqq=1 - Y-proj-uncut | |
2427 | c iqq=2 - Y-proj-1-cut | |
2428 | c iqq=3 - Y-proj-2-cut | |
2429 | c iqq=4 - Y-proj-soft-cut | |
2430 | c iqq=5 - Y-proj-gss-cut | |
2431 | c iqq=6 - Y-proj-qss-cut | |
2432 | c iqq=7 - Y-proj-ssg-cut | |
2433 | c iqq=8 - Y-proj-ssq-cut | |
2434 | c iqq=9 - Y-proj-difr | |
2435 | c iqq=-1 - Y-targ-uncut | |
2436 | c iqq=-2 - Y-targ-1-cut | |
2437 | c iqq=-3 - Y-targ-2-cut | |
2438 | c iqq=-4 - Y-targ-soft-cut | |
2439 | c iqq=-5 - Y-targ-gss-cut | |
2440 | c iqq=-6 - Y-targ-qss-cut | |
2441 | c iqq=-7 - Y-targ-ssg-cut | |
2442 | c iqq=-8 - Y-targ-ssq-cut | |
2443 | c iqq=-9 - Y-targ-difr | |
2444 | c------------------------------------------------------------------------ | |
2445 | ||
2446 | psvy=0. | |
2447 | return | |
2448 | end | |
2449 | ||
2450 | c------------------------------------------------------------------------ | |
2451 | function psvx(xpp,xpr,xpm,xmr,b,iqq) | |
2452 | c----------------------------------------------------------------------- | |
2453 | c psvx - 4p-contributions to the interaction eikonal | |
2454 | c xpp - lc+ for the pomeron, | |
2455 | c xpr - lc+ for the remnant, | |
2456 | c xpm - lc- for the pomeron, | |
2457 | c xpr - lc- for the remnant, | |
2458 | c b - impact parameter, | |
2459 | c iqq=0 - X-uncut | |
2460 | c iqq=1 - X-1-cut | |
2461 | c iqq=2 - X-Y+cut | |
2462 | c iqq=-2 - X-Y-cut | |
2463 | c iqq=3 - X-1-cut-soft | |
2464 | c iqq=4 - X-1-cut-gss | |
2465 | c iqq=-4 - X-1-cut-gss | |
2466 | c iqq=5 - X-1-cut-qss | |
2467 | c iqq=-5 - X-1-cut-qss | |
2468 | c iqq=6 - X-difr+ | |
2469 | c iqq=-6 - X-difr- | |
2470 | c------------------------------------------------------------------------ | |
2471 | ||
2472 | psvx=0. | |
2473 | return | |
2474 | end | |
2475 | ||
2476 | ||
2477 | ||
2478 | ||
2479 | ||
2480 | c | |
2481 | c | |
2482 | c | |
2483 | c | |
2484 | c | |
2485 | cc------------------------------------------------------------------------ | |
2486 | c function psftig(x,xpomr,jj) | |
2487 | cc----------------------------------------------------------------------- | |
2488 | c | |
2489 | c psftig=0. | |
2490 | c end | |
2491 | c | |
2492 | c | |
2493 | cc------------------------------------------------------------------------ | |
2494 | c function psftih(zz,ddd) | |
2495 | cc----------------------------------------------------------------------- | |
2496 | c | |
2497 | c psftih=0. | |
2498 | c return | |
2499 | c end | |
2500 | c | |
2501 | cc------------------------------------------------------------------------ | |
2502 | c function psftij(zz,ddd) | |
2503 | cc------------------------------------------------------------------------ | |
2504 | c | |
2505 | c psftij=0. | |
2506 | c return | |
2507 | c end | |
2508 | c | |
2509 | cc------------------------------------------------------------------------ | |
2510 | c function psftik(xp,del1,rh1,rh2,rh3,rp,z) | |
2511 | cc----------------------------------------------------------------------- | |
2512 | c | |
2513 | c psftik=0. | |
2514 | c return | |
2515 | c end | |
2516 | c | |
2517 | cc------------------------------------------------------------------------ | |
2518 | c function psftim(xp1,xp,del1,rh1,rh2,rh3,rp,z) | |
2519 | cc----------------------------------------------------------------------- | |
2520 | c | |
2521 | c psftim=0. | |
2522 | c return | |
2523 | c end | |
2524 | c | |
2525 | cc------------------------------------------------------------------------ | |
2526 | c function psftil(xp,del1,rh1,rh2,rh3,rp,z) | |
2527 | cc------------------------------------------------------------------------ | |
2528 | c | |
2529 | c psftil=0. | |
2530 | c return | |
2531 | c end | |
2532 | c | |
2533 | cc------------------------------------------------------------------------ | |
2534 | c function psftigt(x) | |
2535 | cc----------------------------------------------------------------------- | |
2536 | c | |
2537 | c psftigt=0. | |
2538 | c return | |
2539 | c end | |
2540 | c | |
2541 | cc------------------------------------------------------------------------ | |
2542 | c function psftist(x) | |
2543 | cc----------------------------------------------------------------------- | |
2544 | c psftist=0. | |
2545 | c return | |
2546 | c end | |
2547 | c | |
2548 | cc------------------------------------------------------------------------ | |
2549 | c function psftig1(x,xpomr,jj) | |
2550 | cc----------------------------------------------------------------------- | |
2551 | c psftig1=0. | |
2552 | c return | |
2553 | c end | |
2554 | c | |
2555 | cc------------------------------------------------------------------------ | |
2556 | c function psftis1(x,xpomr,jj) | |
2557 | cc----------------------------------------------------------------------- | |
2558 | c psftis1=0. | |
2559 | c return | |
2560 | c end | |
2561 | c | |
2562 | cc------------------------------------------------------------------------ | |
2563 | c function psd3p1(xd,xpomr,qq,jj) | |
2564 | cc----------------------------------------------------------------------- | |
2565 | cc psd3p1 - df2difr/dx_pomr | |
2566 | cc xd - bjorken x, | |
2567 | cc xpomr - pomeron x, | |
2568 | cc qq - photon virtuality | |
2569 | cc jj=1 - 1st order | |
2570 | cc----------------------------------------------------------------------- | |
2571 | c | |
2572 | c psd3p1=0. | |
2573 | c | |
2574 | c return | |
2575 | c end | |
2576 | c | |
2577 | cc------------------------------------------------------------------------ | |
2578 | c function psv3p(sy,xpp,xpm,zb) | |
2579 | cc----------------------------------------------------------------------- | |
2580 | cc psv3p - 3p-contributions to the interaction eikonal | |
2581 | cc sy - energy squared for the hard interaction, | |
2582 | cc xpp - lc+ for the sh pomeron, | |
2583 | cc xpm - lc- for the sh pomeron, | |
2584 | cc z - impact parameter factor, z=exp(-b**2/4*rp), | |
2585 | cc------------------------------------------------------------------------ | |
2586 | c | |
2587 | c psv3p=0. | |
2588 | c return | |
2589 | c end | |
2590 | c | |
2591 | cc------------------------------------------------------------------------ | |
2592 | c function psfro(xpomr,zb,iclp,icdpro) | |
2593 | cc----------------------------------------------------------------------- | |
2594 | cc psfro - generalized froissaron between proj. and 3p-vertex | |
2595 | cc xpp - lc+ for the proj. side, | |
2596 | cc xpomr - lc+ for the vertex, | |
2597 | cc zb - impact parameter factor, z=exp(-b**2/4*rp), | |
2598 | cc------------------------------------------------------------------------ | |
2599 | c psfro=0. | |
2600 | c return | |
2601 | c end | |
2602 | c | |
2603 | cc------------------------------------------------------------------------ | |
2604 | c function psv2(xpomr,zb,iclp,iqq) | |
2605 | cc----------------------------------------------------------------------- | |
2606 | cc psv2 - 2-pom contribution to the froissaron | |
2607 | cc xpomr - lc+ for the vertex, | |
2608 | cc zb - impact parameter factor, z=exp(-b**2/4*rp), | |
2609 | cc------------------------------------------------------------------------ | |
2610 | c | |
2611 | c psv2=0. | |
2612 | c return | |
2613 | c end | |
2614 | c | |
2615 | cc------------------------------------------------------------------------ | |
2616 | c function psvfro(xpp,xpr,xpomr,zb,iclp,icdpro,iqq) | |
2617 | cc----------------------------------------------------------------------- | |
2618 | cc psvfro - effective froissaron contributions | |
2619 | cc xpomr - lc+ for the vertex, | |
2620 | cc zb - impact parameter factor, z=exp(-b**2/4*rp), | |
2621 | cc iqq=0 - total uncut | |
2622 | cc iqq=1 - total 1-cut | |
2623 | cc iqq=2 - total 2-cut | |
2624 | cc iqq=3 - soft 1-cut | |
2625 | cc iqq=4 - gg 1-cut | |
2626 | cc iqq=5 - qg 1-cut | |
2627 | cc iqq=6 - difr | |
2628 | cc------------------------------------------------------------------------ | |
2629 | c | |
2630 | c psvfro=0. | |
2631 | c return | |
2632 | c end | |
2633 | c | |
2634 | cc------------------------------------------------------------------------ | |
2635 | c function psfroin(xpomr,z,iclp,icdpro) | |
2636 | cc----------------------------------------------------------------------- | |
2637 | cc psfroin - interpolation of effective froissaron corrections | |
2638 | cc xpomr - lc+ for the 3p-vertex, | |
2639 | cc z - impact parameter factor, z=exp(-b**2/4*rp), | |
2640 | cc----------------------------------------------------------------------- | |
2641 | c | |
2642 | c psfroin=0. | |
2643 | c return | |
2644 | c end | |
2645 | c | |
2646 | cc------------------------------------------------------------------------ | |
2647 | c function psvnorm(b) | |
2648 | cc----------------------------------------------------------------------- | |
2649 | cc psvnorm - X-contribution normalization | |
2650 | cc b - impact parameter | |
2651 | cc----------------------------------------------------------------------- | |
2652 | c | |
2653 | c psvnorm=0. | |
2654 | c return | |
2655 | c end | |
2656 | c | |
2657 | cc------------------------------------------------------------------------ | |
2658 | c function psvxb(dxpp,dxpr,dxpm,dxmr,dxpomr,bb1,bb2 | |
2659 | c *,iclp,iclt,icdpro,icdtar,iqq) | |
2660 | cc----------------------------------------------------------------------- | |
2661 | cc psvxb - integrand for X-contributions | |
2662 | cc dxpomr - lc+ for the vertex, | |
2663 | cc bb1,bb2 - impact parameters to proj(targ), | |
2664 | cc iqq=0 - uncut | |
2665 | cc iqq=1 - 1-cut | |
2666 | cc iqq=2 - Y-cut | |
2667 | cc iqq=3 - soft 1-cut | |
2668 | cc iqq=4 - gg 1-cut | |
2669 | cc iqq=5 - qg 1-cut | |
2670 | cc iqq=6 - difr | |
2671 | cc------------------------------------------------------------------------ | |
2672 | c double precision dxpp,dxpr,dxpm,dxmr,dxpomr | |
2673 | c | |
2674 | c psvxb=0. | |
2675 | c return | |
2676 | c end | |
2677 | c | |
2678 | cc------------------------------------------------------------------------ | |
2679 | c function pscoef(zz,alp1,alp2,iclp,iqq) | |
2680 | cc----------------------------------------------------------------------- | |
2681 | cc pscoef - integrated vertexes | |
2682 | cc zz=xpomr/xpr(xpp) | |
2683 | cc iqq=0 - 2-cut | |
2684 | cc iqq=1 - 1-uncut | |
2685 | cc iqq=2 - 2-uncut | |
2686 | cc------------------------------------------------------------------------ | |
2687 | c | |
2688 | c pscoef=0. | |
2689 | c return | |
2690 | c end | |
2691 | c | |
2692 | cc------------------------------------------------------------------------ | |
2693 | c function pscoefi(z,i1,i2,iclp,iqq) | |
2694 | cc----------------------------------------------------------------------- | |
2695 | cc pscoefi - interpolation of integrated vertexes | |
2696 | cc z=xpomr/xpr(xpp) | |
2697 | cc iqq=0 - 2-cut | |
2698 | cc iqq=1 - 1-uncut | |
2699 | cc iqq=2 - 2-uncut | |
2700 | cc------------------------------------------------------------------------ | |
2701 | c pscoefi=0. | |
2702 | c return | |
2703 | c end | |
2704 | c | |
2705 | c |