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4c039060 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
88cb7938 16/* $Id$ */
4c039060 17
53904666 18// Library class for particle pt and y distributions used for
19// muon spectrometer simulations.
20// To be used with AliGenParam.
21// The following particle typed can be simulated:
22// pi, K, phi, omega, eta, J/Psi, Upsilon, charm and beauty mesons.
23//
24// andreas.morsch@cern.ch
25//
26
65fb704d 27#include "TMath.h"
28#include "TRandom.h"
29
fe4da5cc 30#include "AliGenMUONlib.h"
5c3fd7ea 31
fe4da5cc 32ClassImp(AliGenMUONlib)
33//
34// Pions
198bb1c7 35Double_t AliGenMUONlib::PtPion(Double_t *px, Double_t* /*dummy*/)
fe4da5cc 36{
37//
38// PT-PARAMETERIZATION CDF, PRL 61(88) 1819
39// POWER LAW FOR PT > 500 MEV
40// MT SCALING BELOW (T=160 MEV)
41//
d90f80fd 42 const Double_t kp0 = 1.3;
43 const Double_t kxn = 8.28;
44 const Double_t kxlim=0.5;
45 const Double_t kt=0.160;
46 const Double_t kxmpi=0.139;
47 const Double_t kb=1.;
fe4da5cc 48 Double_t y, y1, xmpi2, ynorm, a;
49 Double_t x=*px;
50 //
d90f80fd 51 y1=TMath::Power(kp0/(kp0+kxlim),kxn);
52 xmpi2=kxmpi*kxmpi;
53 ynorm=kb*(TMath::Exp(-sqrt(kxlim*kxlim+xmpi2)/kt));
fe4da5cc 54 a=ynorm/y1;
d90f80fd 55 if (x > kxlim)
56 y=a*TMath::Power(kp0/(kp0+x),kxn);
fe4da5cc 57 else
d90f80fd 58 y=kb*TMath::Exp(-sqrt(x*x+xmpi2)/kt);
fe4da5cc 59 return y*x;
60}
753690b0 61//
62// y-distribution
63//
198bb1c7 64Double_t AliGenMUONlib::YPion( Double_t *py, Double_t */*dummy*/)
753690b0 65{
d90f80fd 66// Pion y
2280e6af 67 Double_t y=TMath::Abs(*py);
68/*
d90f80fd 69 const Double_t ka = 7000.;
70 const Double_t kdy = 4.;
d90f80fd 71 Double_t ex = y*y/(2*kdy*kdy);
72 return ka*TMath::Exp(-ex);
2280e6af 73*/
74 return 1.16526e+04+y*-3.79886e+03+y*y*4.31130e+02;
75
753690b0 76}
77// particle composition
78//
65fb704d 79Int_t AliGenMUONlib::IpPion(TRandom *ran)
753690b0 80{
d90f80fd 81// Pion composition
65fb704d 82 if (ran->Rndm() < 0.5) {
753690b0 83 return 211;
84 } else {
85 return -211;
86 }
87}
fe4da5cc 88
89//____________________________________________________________
90//
91// Mt-scaling
92
93Double_t AliGenMUONlib::PtScal(Double_t pt, Int_t np)
94{
95 // SCALING EN MASSE PAR RAPPORT A PTPI
96 // MASS PI,K,ETA,RHO,OMEGA,ETA',PHI
d90f80fd 97 const Double_t khm[10] = {.13957,.493,.5488,.769,.7826,.958,1.02,0,0,0};
fe4da5cc 98 // VALUE MESON/PI AT 5 GEV
d90f80fd 99 const Double_t kfmax[10]={1.,0.3,0.55,1.0,1.0,1.0,1.0,0,0,0};
fe4da5cc 100 np--;
d90f80fd 101 Double_t f5=TMath::Power(((sqrt(100.018215)+2.)/(sqrt(100.+khm[np]*khm[np])+2.0)),12.3);
102 Double_t fmax2=f5/kfmax[np];
fe4da5cc 103 // PIONS
104 Double_t ptpion=100.*PtPion(&pt, (Double_t*) 0);
105 Double_t fmtscal=TMath::Power(((sqrt(pt*pt+0.018215)+2.)/
d90f80fd 106 (sqrt(pt*pt+khm[np]*khm[np])+2.0)),12.3)/ fmax2;
fe4da5cc 107 return fmtscal*ptpion;
108}
109//
753690b0 110// kaon
111//
112// pt-distribution
113//____________________________________________________________
198bb1c7 114Double_t AliGenMUONlib::PtKaon( Double_t *px, Double_t */*dummy*/)
753690b0 115{
d90f80fd 116// Kaon pT
753690b0 117 return PtScal(*px,2);
118}
119
120// y-distribution
fe4da5cc 121//____________________________________________________________
198bb1c7 122Double_t AliGenMUONlib::YKaon( Double_t *py, Double_t */*dummy*/)
fe4da5cc 123{
d90f80fd 124// Kaon y
2280e6af 125 Double_t y=TMath::Abs(*py);
126/*
d90f80fd 127 const Double_t ka = 1000.;
128 const Double_t kdy = 4.;
fe4da5cc 129 //
d90f80fd 130 Double_t ex = y*y/(2*kdy*kdy);
131 return ka*TMath::Exp(-ex);
2280e6af 132*/
133
134 return 1.16526e+04+y*-3.79886e+03+y*y*4.31130e+02;
753690b0 135}
136
137// particle composition
138//
65fb704d 139Int_t AliGenMUONlib::IpKaon(TRandom *ran)
753690b0 140{
d90f80fd 141// Kaon composition
65fb704d 142 if (ran->Rndm() < 0.5) {
753690b0 143 return 321;
144 } else {
145 return -321;
146 }
fe4da5cc 147}
753690b0 148
fe4da5cc 149// J/Psi
150//
151//
152// pt-distribution
153//____________________________________________________________
198bb1c7 154Double_t AliGenMUONlib::PtJpsi( Double_t *px, Double_t */*dummy*/)
fe4da5cc 155{
d90f80fd 156// J/Psi pT
157 const Double_t kpt0 = 4.;
158 const Double_t kxn = 3.6;
fe4da5cc 159 Double_t x=*px;
160 //
d90f80fd 161 Double_t pass1 = 1.+(x/kpt0)*(x/kpt0);
162 return x/TMath::Power(pass1,kxn);
fe4da5cc 163}
05932df6 164
198bb1c7 165Double_t AliGenMUONlib::PtJpsiPbPb( Double_t *px, Double_t */*dummy*/)
05932df6 166{
1af7144e 167// J/Psi pT spectrum
05932df6 168//
169// R. Vogt 2002
170// PbPb 5.5 TeV
171// MRST HO
172// mc = 1.4 GeV, pt-kick 1 GeV
173//
1af7144e 174 Float_t x = px[0];
175 Float_t c[8] = {
176 -2.13098e+00, 9.46552e+00, -5.06799e+00, 1.27260e+00,
177 -1.83806e-01, 1.55853e-02, -7.23241e-04, 1.42105e-05
05932df6 178 };
1af7144e 179
3d905dd7 180 Double_t y;
181 if (x < 10.) {
182 Int_t j;
183 y = c[j = 7];
184 while (j > 0) y = y * x +c[--j];
185 y = x * TMath::Exp(y);
186 } else {
187 y = 0.;
188 }
1af7144e 189 return y;
05932df6 190}
17d28ba5 191
192Double_t AliGenMUONlib::PtJpsiBPbPb( Double_t *px, Double_t */*dummy*/)
193{
194// J/Psi pT spectrum
195// B -> J/Psi X
196 Double_t x0 = 4.0384;
197 Double_t n = 3.0288;
198
199 Double_t x = px[0];
200 Double_t y = x / TMath::Power((1. + (x/x0)*(x/x0)), n);
201
202 return y;
203}
204
205
198bb1c7 206Double_t AliGenMUONlib::PtJpsiPP( Double_t *px, Double_t */*dummy*/)
bb6e81ac 207{
208// J/Psi pT spectrum
209//
210// R. Vogt 2002
211// pp 14 TeV
212// MRST HO
213// mc = 1.4 GeV, pt-kick 1 GeV
214//
215 Float_t x = px[0];
216 Float_t c[4] = {8.47471e+00, -1.93567e+00, 1.50271e-01, -5.51212e-03};
217
218 Double_t y;
219 if (x < 10.) {
220 Int_t j;
221 y = c[j = 3];
222 while (j > 0) y = y * x +c[--j];
223 y = x * TMath::Exp(y);
224 } else {
225 y = 0.;
226 }
227 return y;
228}
229
fe4da5cc 230//
231// y-distribution
232//____________________________________________________________
198bb1c7 233Double_t AliGenMUONlib::YJpsi(Double_t *py, Double_t */*dummy*/)
fe4da5cc 234{
d90f80fd 235// J/psi y
236 const Double_t ky0 = 4.;
237 const Double_t kb=1.;
fe4da5cc 238 Double_t yj;
239 Double_t y=TMath::Abs(*py);
240 //
d90f80fd 241 if (y < ky0)
242 yj=kb;
fe4da5cc 243 else
d90f80fd 244 yj=kb*TMath::Exp(-(y-ky0)*(y-ky0)/2);
fe4da5cc 245 return yj;
246}
05932df6 247
248
198bb1c7 249Double_t AliGenMUONlib::YJpsiPbPb( Double_t *px, Double_t */*dummy*/)
05932df6 250{
251
252//
253// J/Psi y
254//
255//
256// R. Vogt 2002
257// PbPb 5.5 TeV
258// MRST HO
259// mc = 1.4 GeV, pt-kick 1 GeV
260//
1af7144e 261 Double_t c[5] = {-6.03425e+02, 4.98257e+02, -1.38794e+02, 1.62209e+01, -6.85955e-01};
262 Double_t x = TMath::Abs(px[0]);
263 Double_t y;
264
265 if (x < 4.) {
266 y = 31.754;
267 } else if (x < 6) {
268 Int_t j;
269 y = c[j = 4];
270 while (j > 0) y = y * x + c[--j];
271 } else {
272 y =0.;
273 }
274
275 return y;
05932df6 276}
277
198bb1c7 278Double_t AliGenMUONlib::YJpsiPP( Double_t *px, Double_t */*dummy*/)
bb6e81ac 279{
280
281//
282// J/Psi y
283//
284//
285// R. Vogt 2002
286// pp 14 TeV
287// MRST HO
288// mc = 1.4 GeV, pt-kick 1 GeV
289//
290
291 Double_t c[5] = {1.38532e+00, 1.00596e+02, -3.46378e+01, 3.94172e+00, -1.48319e-01};
292 Double_t x = TMath::Abs(px[0]);
293 Double_t y;
294
295 if (x < 2.5) {
296 y = 96.455 - 0.8483 * x * x;
297 } else if (x < 7.9) {
298 Int_t j;
299 y = c[j = 4];
300 while (j > 0) y = y * x + c[--j];
301 } else {
302 y =0.;
303 }
304
305 return y;
306}
307
17d28ba5 308Double_t AliGenMUONlib::YJpsiBPbPb( Double_t *px, Double_t */*dummy*/)
309{
310
311//
312// J/Psi from B->J/Psi X
313//
314//
315
316
317 Double_t c[7] = {7.37025e-02, 0., -2.94487e-03, 0., 6.07953e-06, 0., 5.39219e-07};
318
319 Double_t x = TMath::Abs(px[0]);
320 Double_t y;
321
322 if (x > 6.) {
323 y = 0.;
324 } else {
325 Int_t j;
326 y = c[j = 6];
327 while (j > 0) y = y * x + c[--j];
328 }
329
330 return y;
331}
332
333
334
fe4da5cc 335// particle composition
336//
65fb704d 337Int_t AliGenMUONlib::IpJpsi(TRandom *)
fe4da5cc 338{
d90f80fd 339// J/Psi composition
88cb7938 340 return 443;
fe4da5cc 341}
0ad09590 342Int_t AliGenMUONlib::IpJpsiFamily(TRandom *)
343{
344// J/Psi composition
345 Int_t ip;
346 Float_t r = gRandom->Rndm();
347 if (r < 0.98) {
348 ip = 443;
349 } else {
350 ip = 100443;
351 }
352 return ip;
353}
354
fe4da5cc 355
356// Upsilon
357//
358//
359// pt-distribution
360//____________________________________________________________
198bb1c7 361Double_t AliGenMUONlib::PtUpsilon( Double_t *px, Double_t */*dummy*/ )
fe4da5cc 362{
d90f80fd 363// Upsilon pT
364 const Double_t kpt0 = 5.3;
365 const Double_t kxn = 2.5;
fe4da5cc 366 Double_t x=*px;
367 //
d90f80fd 368 Double_t pass1 = 1.+(x/kpt0)*(x/kpt0);
369 return x/TMath::Power(pass1,kxn);
fe4da5cc 370}
05932df6 371
198bb1c7 372Double_t AliGenMUONlib::PtUpsilonPbPb( Double_t *px, Double_t */*dummy*/)
05932df6 373{
374
375//
376// Upsilon pT
377//
378//
379// R. Vogt 2002
380// PbPb 5.5 TeV
381// MRST HO
382// mc = 1.4 GeV, pt-kick 1 GeV
383//
1af7144e 384 Float_t x = px[0];
385 Double_t c[8] = {
386 -1.03488e+01, 1.28065e+01, -6.60500e+00, 1.66140e+00,
387 -2.34293e-01, 1.86925e-02, -7.80708e-04, 1.30610e-05
388 };
3d905dd7 389 Double_t y;
390 if (x < 10.) {
391 Int_t j;
392 y = c[j = 7];
393 while (j > 0) y = y * x +c[--j];
394 y = x * TMath::Exp(y);
395 } else {
396 y = 0.;
397 }
1af7144e 398 return y;
05932df6 399}
400
198bb1c7 401Double_t AliGenMUONlib::PtUpsilonPP( Double_t *px, Double_t */*dummy*/)
bb6e81ac 402{
403
404//
405// Upsilon pT
406//
407//
408// R. Vogt 2002
409// pp 14 TeV
410// MRST HO
411// mc = 1.4 GeV, pt-kick 1 GeV
412//
413 Float_t x = px[0];
414 Double_t c[8] = {-7.93955e+00, 1.06306e+01, -5.21392e+00, 1.19703e+00,
415 -1.45718e-01, 8.95151e-03, -2.04806e-04, -1.13053e-06};
416
417 Double_t y;
418 if (x < 10.) {
419 Int_t j;
420 y = c[j = 7];
421 while (j > 0) y = y * x +c[--j];
422 y = x * TMath::Exp(y);
423 } else {
424 y = 0.;
425 }
426 return y;
427}
428
fe4da5cc 429//
430// y-distribution
431//
432//____________________________________________________________
198bb1c7 433Double_t AliGenMUONlib::YUpsilon(Double_t *py, Double_t */*dummy*/)
fe4da5cc 434{
d90f80fd 435// Upsilon y
436 const Double_t ky0 = 3.;
437 const Double_t kb=1.;
fe4da5cc 438 Double_t yu;
439 Double_t y=TMath::Abs(*py);
440 //
d90f80fd 441 if (y < ky0)
442 yu=kb;
fe4da5cc 443 else
d90f80fd 444 yu=kb*TMath::Exp(-(y-ky0)*(y-ky0)/2);
fe4da5cc 445 return yu;
446}
05932df6 447
448
198bb1c7 449Double_t AliGenMUONlib::YUpsilonPbPb( Double_t *px, Double_t */*dummy*/)
05932df6 450{
451
452//
453// Upsilon y
454//
455//
456// R. Vogt 2002
457// PbPb 5.5 TeV
458// MRST HO
459// mc = 1.4 GeV, pt-kick 1 GeV
460//
461
1af7144e 462 Double_t c[7] = {3.40036e-01, -3.98882e-07, -4.48398e-03, 8.46411e-08, -6.10854e-04,
463 -2.99753e-09, 1.28895e-05};
464
465 Double_t x = px[0];
466 if (TMath::Abs(x) > 5.55) return 0.;
467 Int_t j;
468 Double_t y = c[j = 6];
469 while (j > 0) y = y * x +c[--j];
470 return y;
05932df6 471}
472
198bb1c7 473Double_t AliGenMUONlib::YUpsilonPP( Double_t *px, Double_t */*dummy*/)
bb6e81ac 474{
475
476//
477// Upsilon y
478//
479//
480// R. Vogt 2002
481// p p 14. TeV
482// MRST HO
483// mc = 1.4 GeV, pt-kick 1 GeV
484//
485 Double_t c[7] = {8.91936e-01, -6.46645e-07, -1.52774e-02, 4.28677e-08, -7.01517e-04,
486 -6.20539e-10, 1.29943e-05};
487
488 Double_t x = px[0];
489 if (TMath::Abs(x) > 6.2) return 0.;
490 Int_t j;
491 Double_t y = c[j = 6];
492 while (j > 0) y = y * x +c[--j];
493 return y;
494}
495
fe4da5cc 496// particle composition
497//
65fb704d 498Int_t AliGenMUONlib::IpUpsilon(TRandom *)
fe4da5cc 499{
d90f80fd 500// y composition
88cb7938 501 return 553;
fe4da5cc 502}
0ad09590 503Int_t AliGenMUONlib::IpUpsilonFamily(TRandom *)
504{
505// y composition
506 Int_t ip;
507 Float_t r = gRandom->Rndm();
508
509 if (r < 0.712) {
510 ip = 553;
511 } else if (r < 0.896) {
512 ip = 100553;
513 } else {
514 ip = 200553;
515 }
516 return ip;
517}
fe4da5cc 518
519//
520// Phi
521//
522//
523// pt-distribution (by scaling of pion distribution)
524//____________________________________________________________
198bb1c7 525Double_t AliGenMUONlib::PtPhi( Double_t *px, Double_t */*dummy*/)
fe4da5cc 526{
d90f80fd 527// Phi pT
fe4da5cc 528 return PtScal(*px,7);
529}
530// y-distribution
198bb1c7 531Double_t AliGenMUONlib::YPhi( Double_t *px, Double_t */*dummy*/)
fe4da5cc 532{
d90f80fd 533// Phi y
534 Double_t *dum=0;
535 return YJpsi(px,dum);
fe4da5cc 536}
537// particle composition
538//
65fb704d 539Int_t AliGenMUONlib::IpPhi(TRandom *)
fe4da5cc 540{
d90f80fd 541// Phi composition
89512a3b 542 return 333;
543}
544
545//
546// omega
547//
548//
549// pt-distribution (by scaling of pion distribution)
550//____________________________________________________________
198bb1c7 551Double_t AliGenMUONlib::PtOmega( Double_t *px, Double_t */*dummy*/)
89512a3b 552{
553// Omega pT
554 return PtScal(*px,5);
555}
556// y-distribution
198bb1c7 557Double_t AliGenMUONlib::YOmega( Double_t *px, Double_t */*dummy*/)
89512a3b 558{
559// Omega y
560 Double_t *dum=0;
561 return YJpsi(px,dum);
562}
563// particle composition
564//
565Int_t AliGenMUONlib::IpOmega(TRandom *)
566{
567// Omega composition
568 return 223;
569}
570
571
572//
573// Eta
574//
575//
576// pt-distribution (by scaling of pion distribution)
577//____________________________________________________________
198bb1c7 578Double_t AliGenMUONlib::PtEta( Double_t *px, Double_t */*dummy*/)
89512a3b 579{
580// Eta pT
581 return PtScal(*px,3);
582}
583// y-distribution
198bb1c7 584Double_t AliGenMUONlib::YEta( Double_t *px, Double_t */*dummy*/)
89512a3b 585{
586// Eta y
587 Double_t *dum=0;
588 return YJpsi(px,dum);
589}
590// particle composition
591//
592Int_t AliGenMUONlib::IpEta(TRandom *)
593{
594// Eta composition
595 return 221;
fe4da5cc 596}
597
598//
599// Charm
600//
601//
602// pt-distribution
603//____________________________________________________________
198bb1c7 604Double_t AliGenMUONlib::PtCharm( Double_t *px, Double_t */*dummy*/)
fe4da5cc 605{
d90f80fd 606// Charm pT
607 const Double_t kpt0 = 4.08;
608 const Double_t kxn = 9.40;
2280e6af 609
fe4da5cc 610 Double_t x=*px;
611 //
2280e6af 612 Double_t pass1 = 1.+(x/kpt0);
d90f80fd 613 return x/TMath::Power(pass1,kxn);
fe4da5cc 614}
615// y-distribution
198bb1c7 616Double_t AliGenMUONlib::YCharm( Double_t *px, Double_t */*dummy*/)
fe4da5cc 617{
d90f80fd 618// Charm y
619 Double_t *dum=0;
620 return YJpsi(px,dum);
fe4da5cc 621}
622
65fb704d 623Int_t AliGenMUONlib::IpCharm(TRandom *ran)
fe4da5cc 624{
d90f80fd 625// Charm composition
65fb704d 626 Float_t random;
fe4da5cc 627 Int_t ip;
628// 411,421,431,4122
65fb704d 629 random = ran->Rndm();
630 if (random < 0.5) {
fe4da5cc 631 ip=411;
65fb704d 632 } else if (random < 0.75) {
fe4da5cc 633 ip=421;
65fb704d 634 } else if (random < 0.90) {
fe4da5cc 635 ip=431;
636 } else {
637 ip=4122;
638 }
65fb704d 639 if (ran->Rndm() < 0.5) {ip=-ip;}
fe4da5cc 640
641 return ip;
642}
643
644
645//
646// Beauty
647//
648//
649// pt-distribution
650//____________________________________________________________
198bb1c7 651Double_t AliGenMUONlib::PtBeauty( Double_t *px, Double_t */*dummy*/)
fe4da5cc 652{
d90f80fd 653// Beauty pT
654 const Double_t kpt0 = 4.;
655 const Double_t kxn = 3.6;
fe4da5cc 656 Double_t x=*px;
657 //
d90f80fd 658 Double_t pass1 = 1.+(x/kpt0)*(x/kpt0);
659 return x/TMath::Power(pass1,kxn);
fe4da5cc 660}
661// y-distribution
198bb1c7 662Double_t AliGenMUONlib::YBeauty( Double_t *px, Double_t */*dummy*/)
fe4da5cc 663{
d90f80fd 664// Beauty y
665 Double_t *dum=0;
666 return YJpsi(px,dum);
fe4da5cc 667}
668
65fb704d 669Int_t AliGenMUONlib::IpBeauty(TRandom *ran)
fe4da5cc 670{
d90f80fd 671// Beauty Composition
65fb704d 672 Float_t random;
fe4da5cc 673 Int_t ip;
65fb704d 674 random = ran->Rndm();
675 if (random < 0.5) {
fe4da5cc 676 ip=511;
65fb704d 677 } else if (random < 0.75) {
fe4da5cc 678 ip=521;
65fb704d 679 } else if (random < 0.90) {
fe4da5cc 680 ip=531;
681 } else {
682 ip=5122;
683 }
65fb704d 684 if (ran->Rndm() < 0.5) {ip=-ip;}
fe4da5cc 685
686 return ip;
687}
688
689typedef Double_t (*GenFunc) (Double_t*, Double_t*);
53904666 690GenFunc AliGenMUONlib::GetPt(Int_t param, const char* tname) const
fe4da5cc 691{
d90f80fd 692// Return pointer to pT parameterisation
05932df6 693 TString sname = TString(tname);
fe4da5cc 694 GenFunc func;
753690b0 695 switch (param)
fe4da5cc 696 {
34f60c01 697 case kPhi:
fe4da5cc 698 func=PtPhi;
699 break;
89512a3b 700 case kOmega:
701 func=PtOmega;
702 break;
703 case kEta:
704 func=PtEta;
705 break;
0ad09590 706 case kJpsiFamily:
34f60c01 707 case kJpsi:
bb6e81ac 708 if (sname == "Vogt" || sname == "Vogt PbPb") {
05932df6 709 func=PtJpsiPbPb;
bb6e81ac 710 } else if (sname == "Vogt pp") {
711 func=PtJpsiPP;
05932df6 712 } else {
713 func=PtJpsi;
714 }
fe4da5cc 715 break;
17d28ba5 716 case kJpsiFromB:
717 func = PtJpsiBPbPb;
718 break;
0ad09590 719 case kUpsilonFamily:
34f60c01 720 case kUpsilon:
bb6e81ac 721 if (sname == "Vogt" || sname == "Vogt PbPb") {
05932df6 722 func=PtUpsilonPbPb;
bb6e81ac 723 } else if (sname == "Vogt pp") {
724 func=PtUpsilonPP;
05932df6 725 } else {
726 func=PtUpsilon;
727 }
0ad09590 728 break;
34f60c01 729 case kCharm:
fe4da5cc 730 func=PtCharm;
731 break;
34f60c01 732 case kBeauty:
fe4da5cc 733 func=PtBeauty;
734 break;
34f60c01 735 case kPion:
753690b0 736 func=PtPion;
737 break;
34f60c01 738 case kKaon:
753690b0 739 func=PtKaon;
740 break;
119b35c7 741 default:
742 func=0;
743 printf("<AliGenMUONlib::GetPt> unknown parametrisation\n");
fe4da5cc 744 }
745 return func;
746}
747
53904666 748GenFunc AliGenMUONlib::GetY(Int_t param, const char* tname) const
fe4da5cc 749{
05932df6 750 TString sname = TString(tname);
751
d90f80fd 752// Return pointer to y- parameterisation
fe4da5cc 753 GenFunc func;
753690b0 754 switch (param)
fe4da5cc 755 {
34f60c01 756 case kPhi:
fe4da5cc 757 func=YPhi;
758 break;
89512a3b 759 case kEta:
760 func=YEta;
761 break;
762 case kOmega:
763 func=YOmega;
764 break;
0ad09590 765 case kJpsiFamily:
34f60c01 766 case kJpsi:
bb6e81ac 767 if (sname == "Vogt" || sname == "Vogt PbPb") {
05932df6 768 func=YJpsiPbPb;
bb6e81ac 769 } else if (sname == "Vogt pp"){
770 func=YJpsiPP;
05932df6 771 } else {
772 func=YJpsi;
773 }
17d28ba5 774 break;
775 case kJpsiFromB:
776 func = YJpsiBPbPb;
fe4da5cc 777 break;
0ad09590 778 case kUpsilonFamily:
34f60c01 779 case kUpsilon:
bb6e81ac 780 if (sname == "Vogt" || sname == "Vogt PbPb") {
05932df6 781 func=YUpsilonPbPb;
bb6e81ac 782 } else if (sname == "Vogt pp") {
783 func = YUpsilonPP;
05932df6 784 } else {
785 func=YUpsilon;
786 }
fe4da5cc 787 break;
34f60c01 788 case kCharm:
fe4da5cc 789 func=YCharm;
790 break;
34f60c01 791 case kBeauty:
fe4da5cc 792 func=YBeauty;
793 break;
34f60c01 794 case kPion:
753690b0 795 func=YPion;
796 break;
34f60c01 797 case kKaon:
753690b0 798 func=YKaon;
799 break;
119b35c7 800 default:
801 func=0;
802 printf("<AliGenMUONlib::GetY> unknown parametrisation\n");
fe4da5cc 803 }
804 return func;
805}
65fb704d 806typedef Int_t (*GenFuncIp) (TRandom *);
198bb1c7 807GenFuncIp AliGenMUONlib::GetIp(Int_t param, const char* /*tname*/) const
fe4da5cc 808{
d90f80fd 809// Return pointer to particle type parameterisation
fe4da5cc 810 GenFuncIp func;
753690b0 811 switch (param)
fe4da5cc 812 {
34f60c01 813 case kPhi:
fe4da5cc 814 func=IpPhi;
815 break;
89512a3b 816 case kEta:
817 func=IpEta;
818 break;
819 case kOmega:
820 func=IpOmega;
821 break;
0ad09590 822 case kJpsiFamily:
823 func=IpJpsiFamily;
824 break;
34f60c01 825 case kJpsi:
17d28ba5 826 case kJpsiFromB:
fe4da5cc 827 func=IpJpsi;
828 break;
34f60c01 829 case kUpsilon:
fe4da5cc 830 func=IpUpsilon;
831 break;
0ad09590 832 case kUpsilonFamily:
833 func=IpUpsilonFamily;
834 break;
34f60c01 835 case kCharm:
fe4da5cc 836 func=IpCharm;
837 break;
34f60c01 838 case kBeauty:
fe4da5cc 839 func=IpBeauty;
840 break;
34f60c01 841 case kPion:
753690b0 842 func=IpPion;
843 break;
34f60c01 844 case kKaon:
753690b0 845 func=IpKaon;
846 break;
119b35c7 847 default:
848 func=0;
849 printf("<AliGenMUONlib::GetIp> unknown parametrisation\n");
fe4da5cc 850 }
851 return func;
852}
853
854
753690b0 855
05932df6 856Float_t AliGenMUONlib::Interpolate(Float_t x, Float_t* y, Float_t x0,
857 Float_t dx,
858 Int_t n, Int_t no)
859{
860//
861// Neville's alorithm for interpolation
862//
863// x: x-value
864// y: Input array
865// x0: minimum x
866// dx: step size
867// n: number of data points
868// no: order of polynom
869//
870 Float_t* c = new Float_t[n];
871 Float_t* d = new Float_t[n];
872 Int_t m, i;
873 for (i = 0; i < n; i++) {
874 c[i] = y[i];
875 d[i] = y[i];
876 }
877
878 Int_t ns = int((x - x0)/dx);
879
880 Float_t y1 = y[ns];
881 ns--;
882 for (m = 0; m < no; m++) {
883 for (i = 0; i < n-m; i++) {
884 Float_t ho = x0 + Float_t(i) * dx - x;
885 Float_t hp = x0 + Float_t(i+m+1) * dx - x;
886 Float_t w = c[i+1] - d[i];
887 Float_t den = ho-hp;
888 den = w/den;
889 d[i] = hp * den;
890 c[i] = ho * den;
891 }
892 Float_t dy;
893
894 if (2*ns < (n-m-1)) {
895 dy = c[ns+1];
896 } else {
897 dy = d[ns--];
898 }
899 y1 += dy;}
900 delete[] c;
901 delete[] d;
902
903 return y1;
904}
905
753690b0 906