VBF: libstructf_12.f

File libstructf_12.f, 23.4 KB (added by trac, 13 years ago)
Line 
1c--------couplings----second argument 1->W-, 2->w+, 3->Z, 4->gamma,
2c----- 5->gammaZ
3 subroutine SetCouplings()
4 implicit none
5 integer nf,i,j
6 double precision couplings(-6:6,5), couplings3(-6:6,5),sthw
7 common/coupl/couplings
8 common/coupl3/couplings3
9 common/nflav/nf
10 sthw=0.2315d0
11 do i=-6,6
12 do j=1,5
13 couplings(i,j)=0d0
14 couplings3(i,j)=0d0
15 end do
16 end do
17c---------- W- ------------------
18 do i=1,3
19 couplings(2*i,1)=2d0
20 couplings3(2*i,1)=2d0
21 couplings(-2*i+1,1)=2d0
22 couplings3(-2*i+1,1)=2d0
23 end do
24c--------- W+ ------------------
25 do i=-6,6
26 couplings(i,2)=couplings(-i,1)
27 couplings3(i,2)=couplings3(-i,1)
28 end do
29c---------gamma-----------------
30 do i=1,3
31 end do
32c--------Z0--------------------
33 do i=1,3
34 couplings(2*i,3)=2d0*(1d0/4d0+(1d0/2d0-4d0/3d0*sthw)**2)
35 couplings(-2*i,3)=2d0*(1d0/4d0+(1d0/2d0-4d0/3d0*sthw)**2)
36 couplings(2*i-1,3)=2d0*(1d0/4d0+(1d0/2d0-2d0/3d0*sthw)**2)
37 couplings(-2*i+1,3)=2d0*(1d0/4d0+(1d0/2d0-2d0/3d0*sthw)**2)
38
39 couplings3(2*i,3)=(1d0-8d0/3d0*sthw)
40 couplings3(-2*i,3)=(1d0-8d0/3d0*sthw)
41 couplings3(2*i-1,3)=(1d0-4d0/3d0*sthw)
42 couplings3(-2*i+1,3)=(1d0-4d0/3d0*sthw)
43 end do
44 do i=1,nf
45 do j=1,5
46 couplings(0,j)=couplings(0,j)+couplings(-i,j)+couplings(i,j)
47 couplings3(0,j)=couplings3(0,j)+couplings3(-i,j)+couplings3(i,j)
48 end do
49 end do
50 return
51 end
52
53ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
54c--------------------------------------------------------------------------
55c PDF gives the value of the parton density, i.e. q(x) instead of x q(x), with the coupling included
56
57 subroutine PDF(x,q,f)
58 implicit none
59 integer i,v,f3c
60 double precision x,q,f(-6:6),couplings(-6:6,5),couplings3(-6:6,5)
61 common/coupl/couplings
62 common/coupl3/couplings3
63 common/vect/v
64 common/f3call/f3c
65 call Evolvepdf(x,q,f)
66 if (f3c.eq.0) then
67 do i=-6,6
68 f(i)=f(i)*couplings(i,v)/x
69 end do
70 else if(f3c.eq.1) then
71 do i=-6,6
72 f(i)=f(i)*couplings3(i,v)/x
73 end do
74 endif
75
76 return
77 end
78
79 double precision function pdfg(z)
80 implicit none
81 double precision z,x,q,f(-6:6)
82 common/pdfpar/x,q
83 call pdf(x/z,q,f)
84 pdfg=f(0)/z
85 return
86 end
87
88 double precision function Sing(z)
89 implicit none
90 integer i,nf
91 common/nflav/nf
92 double precision z,x,Q, quark, antiq, f(-6:6)
93 common/pdfpar/x,q
94 call PDF(x/z,q,f)
95 quark=0d0
96 antiq=0d0
97 do i=1,nf
98 quark=quark+f(i)
99 antiq=antiq+f(-i)
100 end do
101 sing=(quark+antiq)/z
102 return
103 end
104
105 double precision function NSing(z)
106 implicit none
107 integer i,nf
108 common/nflav/nf
109 double precision z,x,Q, quark, antiq, f(-6:6)
110 common/pdfpar/x,q
111 call PDF(x/z,q,f)
112 quark=0d0
113 antiq=0d0
114 do i=1,nf
115 quark=quark+f(i)
116 antiq=antiq+f(-i)
117 end do
118 nsing=(quark-antiq)/z
119 return
120 end
121
122 double precision function SingReg(z)
123 implicit none
124 integer i,nf
125 common/nflav/nf
126 double precision z,x,Q, quark, antiq, f(-6:6)
127 common/pdfpar/x,q
128 quark=0d0
129 antiq=0d0
130 call PDF(x/z,q,f)
131 do i=1,nf
132 quark=quark+f(i)
133 antiq=antiq+f(-i)
134 end do
135 singreg=(quark+antiq)/z
136
137 quark=0d0
138 antiq=0d0
139 call PDF(x,q,f)
140 do i=1,nf
141 quark=quark+f(i)
142 antiq=antiq+f(-i)
143 end do
144 singreg=singreg-(quark+antiq)
145 return
146 end
147
148 double precision function NSingReg(z)
149 implicit none
150 integer i,nf
151 common/nflav/nf
152 double precision z,x,Q, quark, antiq, f(-6:6)
153 common/pdfpar/x,q
154 quark=0d0
155 antiq=0d0
156 call PDF(x/z,q,f)
157 do i=1,nf
158 quark=quark+f(i)
159 antiq=antiq+f(-i)
160 end do
161 nsingreg=(quark-antiq)/z
162
163 quark=0d0
164 antiq=0d0
165 call PDF(x,q,f)
166 do i=1,nf
167 quark=quark+f(i)
168 antiq=antiq+f(-i)
169 end do
170 nsingreg=nsingreg-(quark-antiq)
171 return
172 end
173
174
175ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
176c--------------------------------------------------------------------------
177c------------------------ FL ------------------------------------------
178
179c-----NLO----------------------------------------------------------
180
181 double precision function CLNLOa(z)
182 implicit none
183 double precision z
184 clnloa=8d0/3d0 *z
185 return
186 end
187
188 double precision function cLNLOga(z)
189 implicit none
190 double precision z
191 clnloga=2d0*z*(1d0-z)
192 return
193 end
194
195c-----NNLO---------------------------------------------------------
196c------------------------------------------------------------------
197c----------SINGLET-------------------------------------------------
198
199 DOUBLE PRECISION FUNCTION CLNNLOSA(Y)
200 IMPLICIT DOUBLE PRECISION (A-Z)
201 INTEGER NF
202 COMMON/NFLAV/NF
203 DL = LOG (Y)
204 DL1 = LOG (1.D0-Y)
205 CLNNLOSA = NF * ( (15.94D0 - 5.212D0 * Y) * (1.D0-Y)**2 * DL1
206 1 + (0.421D0 + 1.520D0 * Y) * DL**2 + 28.09D0 * (1.D0-Y) * DL
207 2 - (2.370D0/Y - 19.27D0) * (1.D0-Y)**3 )
208 RETURN
209 END
210
211 DOUBLE PRECISION FUNCTION CLNNLOGA (Y)
212 IMPLICIT DOUBLE PRECISION (A-Z)
213 DL = LOG (Y)
214 DL1 = LOG (1.D0-Y)
215 CLNNLOGA = ( (94.74D0 - 49.20D0 * Y) * (1.D0-Y) * DL1**2
216 1 + 864.8D0 * (1.D0-Y) * DL1 + 1161.D0* Y * DL * DL1
217 2 + 60.060 * Y * DL**2 + 39.66D0 * (1.D0-Y) * DL
218 3 - 5.333D0 * (1.D0/Y - 1.D0) )
219 RETURN
220 END
221
222c-------------------------------------------------------------------
223c---------NON SINGLET-----------------------------------------------
224C-----CHARGED CURRENT--------------
225 DOUBLE PRECISION FUNCTION CLNNLONSA(Y)
226 IMPLICIT DOUBLE PRECISION (A-Z)
227 INTEGER NF
228 COMMON/NFLAV/NF
229 DL = LOG (Y)
230 DL1 = LOG (1.D0-Y)
231 CLNNLONSA =
232 1 - 52.27D0 + 100.8D0 * Y
233 2 + (23.29D0 * Y - 0.043D0) * DL**2 - 22.21D0 * DL
234 3 + 13.30D0 * DL1**2 - 59.12D0 * DL1 - 141.7D0 * DL * DL1
235 4 + NF * 16.D0/27.D0 *
236 5 ( 6.D0* Y*DL1 - 12.D0* Y*DL - 25.D0* Y + 6.D0)
237 RETURN
238 END
239
240
241c--------------neutral current---------------
242 DOUBLE PRECISION FUNCTION CLNNLONSA_nc (Y)
243 IMPLICIT DOUBLE PRECISION (A-Z)
244 INTEGER NF
245 COMMON/NFLAV/NF
246 DL = LOG (Y)
247 DL1 = LOG (1.D0-Y)
248 CLNNLONSA_NC =
249 1 - 40.41D0 + 97.48D0
250 2 + (26.56D0 * Y - 0.031D0) * DL**2 - 14.85D0 * DL
251 3 + 13.62D0 * DL1**2 - 55.79D0 * DL1 - 150.5D0 * DL * DL1
252 4 + NF * 16.D0/27.D0 * ( 6.D0* Y*DL1 - 12.D0* Y*DL - 25.* Y + 6.D0)
253 RETURN
254 END
255
256
257 DOUBLE PRECISION FUNCTION CLNNLONSC (Y)
258 IMPLICIT DOUBLE PRECISION (A-Z)
259 integer v
260 common/vect/v
261 if (v.le.2) then
262 CLNNLONSC = -0.150D0
263 else
264 CLNNLONSC=-0.164d0
265 end if
266 RETURN
267 END
268
269 double precision function intLnloA(z)
270 implicit none
271 double precision z,cLnloa,sing
272 intLnloa=cLnloA(z)*sing(z)
273 return
274 end
275
276 double precision function intLnlogA(z)
277 implicit none
278 double precision z,cLnloga, pdfg
279 intLnloga=cLnloga(z)*pdfg(z)
280 return
281 end
282
283 double precision function IntLNNLOsa(z)
284 implicit none
285 double precision z, clnnlosa, sing
286 intlnnlosa=clnnlosa(z)*sing(z)
287 return
288 end
289
290 double precision function IntLNNLOga(z)
291 implicit none
292 double precision z, clnnloga, pdfg
293 intlnnloGa=clnnloGa(z)*pdfg(z)
294 return
295 end
296
297 double precision function IntLNNLOnsa(z)
298 implicit none
299 double precision z, clnnlonsa,clnnlonsa_nc, nsing
300 integer v
301 common/vect/v
302 if(v.le.2) then
303 intlnnlonsa=clnnlonsa(z)*nsing(z)
304 else
305 intlnnlonsa=clnnlonsa_nc(z)*nsing(z)
306 end if
307 return
308 end
309
310
311 double precision function FL(x,q,ord,v,zz)
312 implicit none
313 double precision x,q,zz, f(-6:6), quark, antiq,alphaspdf,pi,eps
314 integer ord, nf,v,i,vv,f2,f1
315 double precision intlnloa, intlnloga
316 double precision intlnnlosa, intlnnloga, intlnnlonsa
317 double precision clnnlonsc
318 common/prec/eps
319 double precision xx,qq
320 common/pdfpar/xx,qq
321 common/nflav/nf
322 common/vect/vv
323 integer f3c
324 common/f3call/f3c
325 double precision z,z0
326 z=(1d0-eps-x)*zz +x
327 z0=zz*x
328
329 f3c=0
330
331 xx=x
332 qq=q
333 vv=v
334 if(1d0-x.lt.eps) then
335 fl=0d0
336 else
337
338 quark=0d0
339 antiq=0d0
340 call pdf(x,q,f)
341 do i=1,nf
342 quark=quark+f(i)
343 antiq=antiq+f(-i)
344 end do
345
346 pi=3.1415926535
347
348 if (ord.eq.1) then
349 FL=0d0
350
351 else if (ord.eq.2) then
352 fL=x*alphaspdf(q)/(4d0*pi)*2d0*(1d0-eps-x)*
353 1 (intlnloa(z)+intlnloga(z))
354
355 else if (ord.eq.3) then
356 fl=x*(alphaspdf(q)/(4d0*pi))**2* (
357 1 (1d0-x-eps)*(intlnnlosa(z)+intlnnloga(z)
358 2 +intlnnlonsa(z))
359 3 +(quark-antiq)*cLnnlonsc(x)
360 4 )
361
362 endif
363 endif
364
365 return
366 end
367
368
369
370ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
371c--------------------------------------------------------------------------
372c------------------------ F1 ------------------------------------------
373cccc need to correct for NC
374
375
376 double precision function F1(x,q,ord,v,zz)
377 implicit none
378 double precision x,q,zz, f(-6:6), quark, antiq,alphaspdf,pi,eps
379 integer ord, nf,v,i,vv
380 common/prec/eps
381 double precision xx,qq
382 common/pdfpar/xx,qq
383 common/nflav/nf
384 common/vect/vv
385 double precision f2,fl
386 integer f3c
387 common/f3call/f3c
388 double precision z, z0
389 z=(1d0-eps-x)*zz +x
390 z0=zz*x
391 f3c=0
392
393 xx=x
394 qq=q
395 vv=v
396 if(1d0-x.lt.eps) then
397 f1=0d0
398 else
399
400 quark=0d0
401 antiq=0d0
402 call pdf(x,q,f)
403 do i=1,nf
404 quark=quark+f(i)
405 antiq=antiq+f(-i)
406 end do
407
408 pi=3.1415926535
409
410 if (ord.eq.1) then
411 F1=(quark+antiq)/2d0
412
413 else if (ord.eq.2) then
414 f1=(f2(x,q,ord,v,zz)-fl(x,q,ord,v,zz))/ (2d0*x)
415
416 else if (ord.eq.3) then
417 f1=(f2(x,q,ord,v,zz)-fl(x,q,ord,v,zz))/ (2d0*x)
418 endif
419
420 endif
421 return
422 end
423
424
425ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc
426c--------------------------------------------------------------------------
427c------------------------ F2 ------------------------------------------
428
429 double precision function C2NLOa(z)
430 implicit none
431 double precision z
432 C2NLOa= 4d0/3d0*( 3d0+2d0*z-(1d0+z)*log(1-z)
433 1 -(1d0+z**2)/(1d0-z)*log(z))
434 return
435 end
436
437 double precision function C2NLOb(z)
438 implicit none
439 double precision z
440 C2NLOb= 4d0/3d0*(2d0*log(1d0-z)/(1d0-z)-3d0/2d0 /(1d0-z) )
441 return
442 end
443
444 double precision function C2NLOc(z)
445 implicit none
446 double precision z,pi
447 pi=3.1415926535
448 C2NLOc= -4d0/3d0*(pi**2/3d0+9d0/2d0 )
449 return
450 end
451
452 double precision function C2NLOg(z)
453 implicit none
454 double precision z
455c C2NLOg=1d0/2d0*z*( (z**2+(1-z)**2)*log((1-z)/z)-1d0+8*z*(1-z) )
456 C2NLOg=1d0/2d0*( (z**2+(1-z)**2)*log((1-z)/z)-1d0+8*z*(1-z) )
457 return
458 end
459
460
461 double precision FUNCTION C2NNLOSA(Y)
462 IMPLICIT double precision (A-Z)
463 INTEGER NF
464 COMMON/NFLAV/NF
465 DL = LOG (Y)
466 DL1 = LOG (1.d0-Y)
467 C2NNLOSA = NF * ( 5.290d0 * (1.d0/Y-1.d0) + 4.310d0 * DL**3
468 1 - 2.086d0 * DL**2 + 39.78d0 * DL - 0.101d0 * (1.d0-Y) * DL1**3
469 2 - (24.75d0 - 13.80d0 * Y) * DL**2 * DL1 + 30.23d0 * DL * DL1 )
470 RETURN
471 END
472
473
474 double precision FUNCTION C2NNLOGA (Y)
475 IMPLICIT double precision (A-Z)
476 DL = LOG (Y)
477 DL1 = LOG (1.D0-Y)
478 C2NNLOGA =
479 1 ( 1.d0/Y * (11.90d0 + 1494.d0* DL1) + 5.319d0 * DL**3
480 1 - 59.48d0 * DL**2 - 284.8d0 * DL + 392.4d0 - 1483.d0* DL1
481 2 + (6.445d0 + 209.4d0 * (1.d0-Y)) * DL1**3 - 24.00d0 * DL1**2
482 3 - 724.1d0 * DL**2 * DL1 - 871.8d0 * DL * DL1**2 )
483 RETURN
484 END
485
486 double precision FUNCTION C2NNLOGC (Y)
487 IMPLICIT double precision (A-Z)
488 C2NNLOGC=-0.28d0
489 RETURN
490 END
491c------------------NON SINGLET----------------------
492c---------------charged current-----------------------
493 double precision function C2NNLONSA(Y)
494 IMPLICIT double precision (A-Z)
495 INTEGER NF
496 COMMON/NFLAV/NF
497 DL = LOG (Y)
498 DL1 = LOG (1.D0-Y)
499 C2NNLONSA = - 84.18d0 - 1010.d0* Y
500 2 -3.748d0 * DL**3 - 19.56d0 * DL**2 - 1.235d0 * DL
501 3 - 17.19d0 * DL1**3 + 71.08d0 * DL1**2 - 663.0d0 * DL1
502 4 - 192.4d0 * DL * DL1**2 + 80.41d0 * DL**2 * DL1
503 5 + NF * ( - 5.691d0 - 37.91d0 *Y
504 6 + 2.244d0 * DL**2 + 5.770d0 * DL
505 7 - 1.707d0* DL1**2 + 22.95d0 * DL1
506 8 + 3.036d0 * DL**2 * DL1 + 17.97d0 * DL * DL1 )
507 RETURN
508 END
509
510 DOUBLE PRECISION FUNCTION C2NNLONSB (Y)
511 IMPLICIT DOUBLE PRECISION (A-Z)
512 INTEGER NF
513 COMMON/NFLAV/NF
514 DL1 = LOG (1.D0-Y)
515 DM = 1./(1.D0-Y)
516 C2NNLONSB =
517 1 + 14.2222d0 * DL1**3 - 61.3333d0 * DL1**2- 31.105d0 * DL1
518 2 + 188.64d0
519 3 + NF * ( 1.77778d0 * DL1**2 - 8.5926d0 * DL1 + 6.3489 )
520 C2NNLONSB = DM * C2NNLONSB
521 RETURN
522 END
523
524 DOUBLE PRECISION FUNCTION C2NNLONSC (Y)
525 IMPLICIT DOUBLE PRECISION (A-Z)
526 INTEGER NF
527 COMMON/NFLAV/NF
528 DL1 = LOG (1.D0-Y)
529 C2NNLONSC =
530 1 + 3.55555D0 * DL1**4 - 20.4444D0 * DL1**3 - 15.5525D0 * DL1**2
531 2 + 188.64D0 * DL1 - 338.531D0 + 0.537D0
532 3 + NF * (0.592593D0 * DL1**3 - 4.2963D0 * DL1**2
533 4 + 6.3489D0 * DL1 + 46.844D0 - 0.0035D0)
534 RETURN
535 END
536
537c------------------------ neutral current
538 DOUBLE PRECISION FUNCTION C2NNLONSA_NC (Y)
539 IMPLICIT DOUBLE PRECISION (A-Z)
540 INTEGER NF
541 COMMON/NFLAV/NF
542 DL = LOG (Y)
543 DL1 = LOG (1.D0-Y)
544 C2NNLONSA_NC =
545 1 - 69.59D0 - 1008.D0* Y
546 2 - 2.835D0 * DL**3 - 17.08D0 * DL**2 + 5.986D0 * DL
547 3 - 17.19D0 * DL1**3 + 71.08D0 * DL1**2 - 660.7D0 * DL1
548 4 - 174.8D0 * DL * DL1**2 + 95.09D0 * DL**2 * DL1
549 5 + NF * ( - 5.691D0 - 37.91D0 * Y
550 6 + 2.244D0 * DL**2 + 5.770D0 * DL
551 7 - 1.707D0 * DL1**2 + 22.95D0 * DL1
552 8 + 3.036D0 * DL**2 * DL1 + 17.97D0 * DL * DL1 )
553 RETURN
554 END
555
556
557 DOUBLE PRECISION FUNCTION C2NNLONSC_NC (Y)
558 IMPLICIT REAL*8 (A-Z)
559 INTEGER NF
560 COMMON/NFLAV/NF
561 DL1 = LOG (1.D0-Y)
562 C2NNLONSC_NC =
563 1 + 3.55555D0 * DL1**4 - 20.4444D0 * DL1**3 - 15.5525D0 * DL1**2
564 2 + 188.64D0 * DL1 - 338.531D0 + 0.485D0
565 3 + NF * (0.592593D0 * DL1**3 - 4.2963D0 * DL1**2
566 4 + 6.3489D0 * DL1 + 46.844D0 - 0.0035D0)
567 RETURN
568 END
569
570
571c--------------------------------
572c--------------------------------
573c--------------------------------
574 double precision function Int2NLOa(z)
575 implicit none
576 doubLe precision z,c2nloa,sing
577 int2nloa=c2nloa(z)*sing(z)
578 return
579 end
580
581 double precision function Int2NLOb(z)
582 implicit none
583 doubLe precision z,c2nlob,singreg
584 int2nlob=c2nlob(z)*singreg(z)
585 return
586 end
587
588 double precision function Int2NLOg(z)
589 implicit none
590 double precision z,c2nlog,pdfg
591 int2nlog=c2nlog(z)*pdfg(z)
592 return
593 end
594
595 double precision function Int2NNLOsA(z)
596 implicit none
597 double precision z,sing, c2nnlosa
598 int2nnlosa=sing(z)*c2nnlosa(z)
599 return
600 end
601
602 double precision function Int2NNLOgA(z)
603 implicit none
604 double precision z,pdfg, c2nnloga
605 int2nnloga=pdfg(z)*c2nnloga(z)
606 return
607 end
608
609 double precision function Int2NNLOnsA(z)
610 implicit none
611 double precision z,nsing, c2nnlonsa, c2nnlonsa_nc
612 integer v
613 if (v.le.2) then
614 int2nnlonsa=nsing(z)*c2nnlonsa(z)
615 else
616 int2nnlonsa=nsing(z)*c2nnlonsa_nc(z)
617 end if
618 return
619 end
620
621 double precision function Int2NNLOnsB(z)
622 implicit none
623 double precision z,nsingreg, c2nnlonsB
624 int2nnlonsb=nsingreg(z)*c2nnlonsB(z)
625 return
626 end
627
628
629cccc need to correct for NC
630 double precision function F2(x,q,ord,v,zz)
631 implicit none
632 double precision x,q,zz, f(-6:6), quark, antiq,alphaspdf,pi,eps,
633 1 c2nnlogc,c2nnlonsc,c2nnlonsc_nc,c2nnlonscVAL
634 integer ord, nf,v,i,vv
635 double precision int2nloa,int2nlob, c2nlob,c2nloc, int2nlog
636 double precision int2nnlosa,int2nnloga,
637 1 int2nnlonsa, int2nnlonsb
638 common/prec/eps
639 double precision xx,qq
640 common/pdfpar/xx,qq
641 common/nflav/nf
642 common/vect/vv
643 integer f3c
644 common/f3call/f3c
645 double precision z,z0
646 z=(1d0-eps-x)*zz +x
647 z0=zz*x
648 f3c=0
649
650
651 xx=x
652 qq=q
653 vv=v
654 if(1d0-x.lt.eps) then
655 f2=0d0
656 else
657
658 quark=0d0
659 antiq=0d0
660 call pdf(x,q,f)
661 do i=1,nf
662 quark=quark+f(i)
663 antiq=antiq+f(-i)
664 end do
665
666 pi=3.1415926535
667
668 if (ord.eq.1) then
669 F2=x*(quark+antiq)
670
671 else if (ord.eq.2) then
672 f2=alphaspdf(q)/(4d0*pi)*2d0*x*((1d0-eps-x)*
673 1 (int2nloa(z)+int2nlob(z) +int2nlog(z))
674 2 -x*(quark+antiq)*c2nlob(z0)
675 3 +(quark+antiq)*c2nloc(z)
676 1 )
677
678 else if (ord.eq.3) then
679 if (v.le.2) then
680 c2nnlonscVAL=c2nnlonsc(x)
681 else
682 c2nnlonscVAL=c2nnlonsc_nc(x)
683 end if
684 f2=(alphaspdf(q)/(4d0*pi))**2 *x*(
685 1 (1d0-eps-x)*( int2nnlosa(z)+int2nnloga(z)
686 2 + int2nnlonsa(z)+int2nnlonsb(z))
687 3 + f(0)*c2nnlogc(x)
688 4 + (quark-antiq)*c2nnlonscVAL
689 5 )
690 endif
691
692 endif
693 return
694 end
695
696
697
698cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc--------------------------------------------------------------------------
699c------------------------ F3 ------------------------------------------
700
701 double precision function C3NLOb(z)
702 implicit none
703 double precision z,c2nlob
704 c3nlob=c2nlob(z)
705 return
706 end
707
708 double precision function C3NLOa(z)
709 implicit none
710 double precision z, c2nloa
711 c3nloa=c2nloa(z)-4d0/3d0 *(1d0+z)
712 return
713 end
714
715 DOUBLE PRECISION FUNCTION C3NNLOSUMA (Y)
716 IMPLICIT DOUBLE PRECISION (A-Z)
717 INTEGER NF
718 COMMON/NFLAV/NF
719 DL = LOG (Y)
720 DL1 = LOG (1.D0-Y)
721 C3NNLOSUMA =
722 1 - 206.1D0 - 576.8D0 * Y
723 2 - 3.922D0 * DL**3 - 33.31D0 * DL**2 - 67.60D0 * DL
724 3 - 15.20D0 * DL1**3 + 94.61D0 * DL1**2 - 409.6D0 * DL1
725 4 - 147.9D0 * DL * DL1**2
726 5 + NF * ( - 6.337D0 - 14.97D0 * Y
727 6 + 2.207D0 * DL**2 + 8.683D0 * DL
728 7 + 0.042D0 * DL1**3 - 0.808D0 * DL1**2 + 25.00D0 * DL1
729 8 + 9.684D0 * DL * DL1 )
730 RETURN
731 END
732
733
734 DOUBLE PRECISION FUNCTION C3NNLODIFA (Y)
735 IMPLICIT DOUBLE PRECISION (A-Z)
736 INTEGER NF
737 COMMON/NFLAV/NF
738 DL = LOG (Y)
739 DL1 = LOG (1.-Y)
740 C3NNLODIFA =
741 1 - 242.9D0 - 467.2D0 * Y
742 2 - 3.049D0 * DL**3 - 30.14D0 * DL**2 - 79.14D0 * DL
743 3 - 15.20D0 * DL1**3 + 94.61D0 * DL1**2 - 396.1D0 * DL1
744 4 - 92.43D0 * DL * DL1**2
745 5 + NF * ( - 6.337D0 - 14.97D0 * Y
746 6 + 2.207D0 * DL**2 + 8.683D0 * DL
747 7 + 0.042D0 * DL1**3 - 0.808D0 * DL1**2 + 25.00D0 * DL1
748 8 + 9.684D0 * DL * DL1 )
749 RETURN
750 END
751
752 DOUBLE PRECISION FUNCTION C3NNLOSUMC (Y)
753 IMPLICIT DOUBLE PRECISION (A-Z)
754 INTEGER NF
755 COMMON/NFLAV/NF
756 DL1 = LOG (1.D0-Y)
757 C3NNLOSUMC =
758 1 + 3.55555D0 * DL1**4 - 20.4444D0 * DL1**3 - 15.5525D0 * DL1**2
759 2 + 188.64D0 * DL1 - 338.531D0 - 0.104D0
760 3 + NF * (0.592593D0 * DL1**3 - 4.2963D0 * DL1**2
761 4 + 6.3489D0 * DL1 + 46.844D0 + 0.013D0)
762 RETURN
763 END
764
765
766 DOUBLE PRECISION FUNCTION C3NNLODIFC (Y)
767 IMPLICIT DOUBLE PRECISION (A-Z)
768 INTEGER NF
769 COMMON/NFLAV/NF
770 DL1 = LOG (1D0-Y)
771 C3NNLODIFC =
772 1 + 3.55555D0 * DL1**4 - 20.4444D0 * DL1**3 - 15.5525D0 * DL1**2
773 2 + 188.64D0 * DL1 - 338.531D0 - 0.104D0
774 3 + NF * (0.592593D0 * DL1**3 - 4.2963D0 * DL1**2
775 4 + 6.3489D0 * DL1 + 46.844D0 + 0.013D0)
776 RETURN
777 END
778
779 DOUBLE PRECISION FUNCTION C3NNLOB(Y)
780 IMPLICIT DOUBLE PRECISION (A-Z)
781 INTEGER NF
782 COMMON/NFLAV/NF
783 DL1 = LOG (1.-Y)
784 DM = 1./(1.-Y)
785 C3NNLOB =
786 1 + 14.2222D0 * DL1**3 - 61.3333D0 * DL1**2 - 31.105D0 * DL1
787 2 + 188.64D0
788 3 + NF * ( 1.77778D0 * DL1**2 - 8.5926D0 * DL1 + 6.3489D0 )
789 C3NNLOB = DM * C3NNLOB
790 RETURN
791 END
792
793 double precision function int3nloB(z)
794 implicit none
795 double precision z,c3nlob,nsingreg
796 int3nlob=c3nlob(z)*nsingreg(z)
797 return
798 end
799
800 double precision function int3nloA(z)
801 implicit none
802 double precision z,c3nloa,nsing
803 int3nloa=c3nloA(z)*nsing(z)
804 return
805 end
806
807 double precision function int3nnloB(z)
808 implicit none
809 double precision z,c3nnlob,nsingreg
810 int3nnlob=c3nnlob(z)*nsingreg(z)
811 return
812 end
813
814 double precision function int3nnloA(z)
815 implicit none
816 integer v
817 double precision z,c3nnloa,c3nnlosuma, c3nnlodifa,nsing
818 common/vect/v
819 if ((v.eq.1).or.(v.ge.3)) then
820 c3nnloa=(c3nnlosuma(z)+c3nnlodifa(z))/2d0
821 else if(v.eq.2) then
822 c3nnloa=(c3nnlosuma(z)-c3nnlodifa(z))/2d0
823 end if
824 int3nnloa=c3nnloA*nsing(z)
825 return
826 end
827
828
829
830cccc need to correct for NC
831 double precision function F3(x,q,ord,v,zz)
832 implicit none
833 double precision x,q,zz,f(-6:6),quark,antiq,alphaspdf,pi,eps,
834 1 c3nnloc, c3nnlodifc, c3nnlosumc
835 integer ord, nf,v,i,vv
836 double precision int3nloa, int3nlob, c3nlob,c2nloc
837 double precision int3nnloa, int3nnlob
838 common/prec/eps
839 double precision xx,qq
840 common/pdfpar/xx,qq
841 common/nflav/nf
842 common/vect/vv
843 integer f3c
844 common/f3call/f3c
845 double precision z,z0
846 z=(1d0-eps-x)*zz +x
847 z0=zz*x
848 f3c=1
849
850
851 xx=x
852 qq=q
853 vv=v
854 if(1d0-x.lt.eps) then
855 f3=0d0
856 else
857
858 if (v.eq.4) then
859 f3=0d0
860 else
861
862 quark=0d0
863 antiq=0d0
864 call pdf(x,q,f)
865 do i=1,nf
866 quark=quark+f(i)
867 antiq=antiq+f(-i)
868 end do
869
870 pi=3.1415926535
871
872 if (ord.eq.1) then
873 F3=(quark-antiq)
874
875 else if (ord.eq.2) then
876 f3=alphaspdf(q)/(4d0*pi)*2d0*(
877 1 (1d0-eps-x)*(int3nloa(z)+int3nlob(z))
878 2 -x*(quark-antiq)*c3nlob(z0)
879 3 +(quark-antiq)*c2nloc(z)
880 4 )
881
882 else if (ord.eq.3) then
883 if ((v.eq.1).or.(v.ge.3)) then
884 c3nnloc=(c3nnlosumc(x)+c3nnlodifc(x))/2d0
885 else if(v.eq.2) then
886 c3nnloc=(c3nnlosumc(x)-c3nnlodifc(x))/2d0
887 end if
888 f3=(alphaspdf(q)/(4d0*pi))**2 *(
889 1 (1d0-eps-x)*(int3nnloa(z) +int3nnlob(z))
890 2 + (quark-antiq)*c3nnloc
891 3 )
892
893
894c 1 daind(x,1d0, int3nnloa,eps,key,maxcnt,cnt, err )
895c 2 +daind(x,1d0, int3nnlob,eps,key,maxcnt,cnt, err )
896c 3 + (quark-antiq)*c3nnloc
897c 4 )
898 endif
899
900 endif
901 endif
902 return
903 end