Logarithmic dependence of energy loss added as option.
[u/mrichter/AliRoot.git] / EVGEN / AliGenPythia.cxx
CommitLineData
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
16/*
17$Log$
35967770 18Revision 1.57 2002/05/22 13:22:53 morsch
19Process kPyMbNonDiffr added.
20
5f42cc16 21Revision 1.56 2002/04/26 10:30:01 morsch
22Option kPyBeautyPbMNR added. (N. Carrer).
23
c0acde67 24Revision 1.55 2002/04/17 10:23:56 morsch
25Coding Rule violations corrected.
26
6d4dd317 27Revision 1.54 2002/03/28 11:49:10 morsch
28Pass status code in SetTrack.
29
5ec84200 30Revision 1.53 2002/03/25 14:51:13 morsch
31New stack-fill and count options introduced (N. Carrer).
32
0d7c70a0 33Revision 1.51 2002/03/06 08:46:57 morsch
34- Loop until np-1
35- delete dyn. alloc. arrays (N. Carrer)
36
b9817493 37Revision 1.50 2002/03/03 13:48:50 morsch
38Option kPyCharmPbMNR added. Produce charm pairs in agreement with MNR
39NLO calculations (Nicola Carrer).
40
fbd1348b 41Revision 1.49 2002/02/08 16:50:50 morsch
42Add name and title in constructor.
43
8b31bfac 44Revision 1.48 2001/12/20 11:44:28 morsch
45Add kinematic bias for direct gamma production.
46
b2bb450d 47Revision 1.47 2001/12/19 14:45:00 morsch
48Store number of trials in header.
49
fd8fb861 50Revision 1.46 2001/12/19 10:36:19 morsch
51Add possibility if jet kinematic biasing.
52
988b118b 53Revision 1.45 2001/11/28 08:06:52 morsch
54Use fMaxLifeTime parameter.
55
8cdfd303 56Revision 1.44 2001/11/27 13:13:07 morsch
57Maximum lifetime for long-lived particles to be put on the stack is parameter.
58It can be set via SetMaximumLifetime(..).
59
47fc6bd5 60Revision 1.43 2001/10/21 18:35:56 hristov
61Several pointers were set to zero in the default constructors to avoid memory management problems
62
2685bf00 63Revision 1.42 2001/10/15 08:21:55 morsch
64Vertex truncation settings moved to AliGenMC.
65
4c07486d 66Revision 1.41 2001/10/08 08:45:42 morsch
67Possibility of vertex cut added.
68
a0b2b296 69Revision 1.40 2001/09/25 11:30:23 morsch
70Pass event vertex to header.
71
c5d36e84 72Revision 1.39 2001/07/27 17:09:36 morsch
73Use local SetTrack, KeepTrack and SetHighWaterMark methods
74to delegate either to local stack or to stack owned by AliRun.
75(Piotr Skowronski, A.M.)
76
a99cf51f 77Revision 1.38 2001/07/13 10:58:54 morsch
78- Some coded moved to AliGenMC
79- Improved handling of secondary vertices.
80
fff02fee 81Revision 1.37 2001/06/28 11:17:28 morsch
82SetEventListRange setter added. Events in specified range are listed for
83debugging. (Yuri Kharlov)
84
11dfaf8d 85Revision 1.36 2001/03/30 07:05:49 morsch
86Final print-out in finish run.
87Write parton system for jet-production (preliminary solution).
88
9be6226f 89Revision 1.35 2001/03/09 13:03:40 morsch
90Process_t and Struc_Func_t moved to AliPythia.h
91
f1a48a38 92Revision 1.34 2001/02/14 15:50:40 hristov
93The last particle in event marked using SetHighWaterMark
94
28adac24 95Revision 1.33 2001/01/30 09:23:12 hristov
96Streamers removed (R.Brun)
97
a8a6107b 98Revision 1.32 2001/01/26 19:55:51 hristov
99Major upgrade of AliRoot code
100
2ab0c725 101Revision 1.31 2001/01/17 10:54:31 hristov
102Better protection against FPE
103
0f9e52a3 104Revision 1.30 2000/12/18 08:55:35 morsch
105Make AliPythia dependent generartors work with new scheme of random number generation
106
3356c022 107Revision 1.29 2000/12/04 11:22:03 morsch
108Init of sRandom as in 1.15
109
097ec7c1 110Revision 1.28 2000/12/02 11:41:39 morsch
111Use SetRandom() to initialize random number generator in constructor.
112
1ed25e11 113Revision 1.27 2000/11/30 20:29:02 morsch
114Initialise static variable sRandom in constructor: sRandom = fRandom;
115
ad1df918 116Revision 1.26 2000/11/30 07:12:50 alibrary
117Introducing new Rndm and QA classes
118
65fb704d 119Revision 1.25 2000/10/18 19:11:27 hristov
120Division by zero fixed
121
919c2096 122Revision 1.24 2000/09/18 10:41:35 morsch
123Add possibility to use nuclear structure functions from PDF library V8.
124
811826d8 125Revision 1.23 2000/09/14 14:05:40 morsch
126dito
127
819f84ad 128Revision 1.22 2000/09/14 14:02:22 morsch
129- Correct conversion from mm to cm when passing particle vertex to MC.
130- Correct handling of fForceDecay == all.
131
4451ef92 132Revision 1.21 2000/09/12 14:14:55 morsch
133Call fDecayer->ForceDecay() at the beginning of Generate().
134
00d6ce7d 135Revision 1.20 2000/09/06 14:29:33 morsch
136Use AliPythia for event generation an AliDecayPythia for decays.
137Correct handling of "nodecay" option
138
18edb254 139Revision 1.19 2000/07/11 18:24:56 fca
140Coding convention corrections + few minor bug fixes
141
aee8290b 142Revision 1.18 2000/06/30 12:40:34 morsch
143Pythia takes care of vertex smearing. Correct conversion from Pythia units (mm) to
144Geant units (cm).
145
1512e357 146Revision 1.17 2000/06/09 20:34:07 morsch
147All coding rule violations except RS3 corrected
148
f87cfe57 149Revision 1.16 2000/05/15 15:04:20 morsch
150The full event is written for fNtrack = -1
151Coding rule violations corrected.
152
5ddeb374 153Revision 1.15 2000/04/26 10:14:24 morsch
154Particles array has one entry more than pythia particle list. Upper bound of
155particle loop changed to np-1 (R. Guernane, AM)
156
2a0e6f5b 157Revision 1.14 2000/04/05 08:36:13 morsch
158Check status code of particles in Pythia event
159to avoid double counting as partonic state and final state particle.
160
23211d3e 161Revision 1.13 1999/11/09 07:38:48 fca
162Changes for compatibility with version 2.23 of ROOT
163
084c1b4a 164Revision 1.12 1999/11/03 17:43:20 fca
165New version from G.Martinez & A.Morsch
166
886b6f73 167Revision 1.11 1999/09/29 09:24:14 fca
168Introduction of the Copyright and cvs Log
4c039060 169*/
170
6d4dd317 171//
172// Generator using the TPythia interface (via AliPythia)
173// to generate pp collisions.
174// Using SetNuclei() also nuclear modifications to the structure functions
175// can be taken into account. This makes, of course, only sense for the
176// generation of the products of hard processes (heavy flavor, jets ...)
177//
178// andreas.morsch@cern.ch
179//
180
181
fe4da5cc 182#include "AliGenPythia.h"
fff02fee 183#include "AliGenPythiaEventHeader.h"
18edb254 184#include "AliDecayerPythia.h"
fe4da5cc 185#include "AliRun.h"
186#include "AliPythia.h"
18edb254 187#include "AliPDG.h"
1578254f 188#include <TParticle.h>
18edb254 189#include <TSystem.h>
f87cfe57 190
fe4da5cc 191 ClassImp(AliGenPythia)
192
193AliGenPythia::AliGenPythia()
fff02fee 194 :AliGenMC()
fe4da5cc 195{
18edb254 196// Default Constructor
2685bf00 197 fParticles = 0;
198 fPythia = 0;
988b118b 199 fDecayer = new AliDecayerPythia();
11dfaf8d 200 SetEventListRange();
988b118b 201 SetJetPhiRange();
202 SetJetEtaRange();
fe4da5cc 203}
204
205AliGenPythia::AliGenPythia(Int_t npart)
fff02fee 206 :AliGenMC(npart)
fe4da5cc 207{
208// default charm production at 5. 5 TeV
209// semimuonic decay
210// structure function GRVHO
211//
8b31bfac 212 fName = "Pythia";
213 fTitle= "Particle Generator using PYTHIA";
fe4da5cc 214 fXsection = 0.;
811826d8 215 fNucA1=0;
216 fNucA2=0;
fe4da5cc 217 SetProcess();
218 SetStrucFunc();
886b6f73 219 SetForceDecay();
fe4da5cc 220 SetPtHard();
221 SetEnergyCMS();
18edb254 222 fDecayer = new AliDecayerPythia();
1ed25e11 223 // Set random number generator
097ec7c1 224 sRandom=fRandom;
fff02fee 225 fFlavorSelect = 0;
226 // Produced particles
227 fParticles = new TClonesArray("TParticle",1000);
c5d36e84 228 fEventVertex.Set(3);
988b118b 229 SetEventListRange();
230 SetJetPhiRange();
231 SetJetEtaRange();
719b6b8a 232 // Options determining what to keep in the stack (Heavy flavour generation)
233 fStackFillOpt = kFlavorSelection; // Keep particle with selected flavor
234 fFeedDownOpt = kTRUE; // allow feed down from higher family
235 // Fragmentation on/off
236 fFragmentation = kTRUE;
237 // Default counting mode
238 fCountMode = kCountAll;
fe4da5cc 239}
240
f87cfe57 241AliGenPythia::AliGenPythia(const AliGenPythia & Pythia)
242{
243// copy constructor
6d4dd317 244 Pythia.Copy(*this);
f87cfe57 245}
246
fe4da5cc 247AliGenPythia::~AliGenPythia()
248{
5ddeb374 249// Destructor
fe4da5cc 250}
251
11dfaf8d 252void AliGenPythia::SetEventListRange(Int_t eventFirst, Int_t eventLast)
253{
254 // Set a range of event numbers, for which a table
255 // of generated particle will be printed
256 fDebugEventFirst = eventFirst;
257 fDebugEventLast = eventLast;
258 if (fDebugEventLast==-1) fDebugEventLast=fDebugEventFirst;
259}
260
fe4da5cc 261void AliGenPythia::Init()
262{
5ddeb374 263// Initialisation
18edb254 264 SetMC(AliPythia::Instance());
fe4da5cc 265 fPythia=(AliPythia*) fgMCEvGen;
266//
267 fParentWeight=1./Float_t(fNpart);
268//
269// Forward Paramters to the AliPythia object
00d6ce7d 270 fDecayer->SetForceDecay(fForceDecay);
18edb254 271 fDecayer->Init();
00d6ce7d 272
18edb254 273
fe4da5cc 274 fPythia->SetCKIN(3,fPtHardMin);
35967770 275 fPythia->SetCKIN(4,fPtHardMax);
276 fPythia->SetCKIN(7,fYHardMin);
277 fPythia->SetCKIN(8,fYHardMax);
278
811826d8 279 if (fNucA1 > 0 && fNucA2 > 0) fPythia->SetNuclei(fNucA1, fNucA2);
719b6b8a 280 // Fragmentation?
281 if (fFragmentation) {
282 fPythia->SetMSTP(111,1);
283 } else {
284 fPythia->SetMSTP(111,0);
285 }
286
fe4da5cc 287 fPythia->ProcInit(fProcess,fEnergyCMS,fStrucFunc);
18edb254 288
289 // fPythia->Pylist(0);
290 // fPythia->Pystat(2);
fe4da5cc 291// Parent and Children Selection
292 switch (fProcess)
293 {
f1a48a38 294 case kPyCharm:
f1a48a38 295 case kPyCharmUnforced:
fbd1348b 296 case kPyCharmPbMNR:
b2bb450d 297 fParentSelect[0] = 411;
298 fParentSelect[1] = 421;
299 fParentSelect[2] = 431;
300 fParentSelect[3] = 4122;
8b31bfac 301 fFlavorSelect = 4;
fe4da5cc 302 break;
719b6b8a 303 case kPyD0PbMNR:
304 fParentSelect[0] = 421;
5f42cc16 305 fFlavorSelect = 4;
719b6b8a 306 break;
f1a48a38 307 case kPyBeauty:
c0acde67 308 case kPyBeautyPbMNR:
fff02fee 309 fParentSelect[0]= 511;
310 fParentSelect[1]= 521;
311 fParentSelect[2]= 531;
312 fParentSelect[3]= 5122;
313 fParentSelect[4]= 5132;
314 fParentSelect[5]= 5232;
315 fParentSelect[6]= 5332;
316 fFlavorSelect = 5;
fe4da5cc 317 break;
f1a48a38 318 case kPyBeautyUnforced:
fff02fee 319 fParentSelect[0] = 511;
320 fParentSelect[1] = 521;
321 fParentSelect[2] = 531;
322 fParentSelect[3] = 5122;
323 fParentSelect[4] = 5132;
324 fParentSelect[5] = 5232;
325 fParentSelect[6] = 5332;
326 fFlavorSelect = 5;
fe4da5cc 327 break;
f1a48a38 328 case kPyJpsiChi:
329 case kPyJpsi:
fff02fee 330 fParentSelect[0] = 443;
fe4da5cc 331 break;
f1a48a38 332 case kPyMb:
5f42cc16 333 case kPyMbNonDiffr:
f1a48a38 334 case kPyJets:
335 case kPyDirectGamma:
5be1fe76 336 break;
fe4da5cc 337 }
fff02fee 338 AliGenMC::Init();
fe4da5cc 339}
340
341void AliGenPythia::Generate()
342{
5ddeb374 343// Generate one event
00d6ce7d 344 fDecayer->ForceDecay();
a0b2b296 345
9be6226f 346 Float_t polar[3] = {0,0,0};
347 Float_t origin[3] = {0,0,0};
fff02fee 348 Float_t p[3];
5be1fe76 349// converts from mm/c to s
350 const Float_t kconv=0.001/2.999792458e8;
fe4da5cc 351//
fe4da5cc 352 Int_t nt=0;
353 Int_t jev=0;
7921755b 354 Int_t j, kf;
fe4da5cc 355 fTrials=0;
fff02fee 356
fd8fb861 357 // Set collision vertex position
aee8290b 358 if(fVertexSmear==kPerEvent) {
1512e357 359 fPythia->SetMSTP(151,1);
fe4da5cc 360 for (j=0;j<3;j++) {
fff02fee 361 fPythia->SetPARP(151+j, fOsigma[j]*10.);
fe4da5cc 362 }
aee8290b 363 } else if (fVertexSmear==kPerTrack) {
fe4da5cc 364 fPythia->SetMSTP(151,0);
fe4da5cc 365 }
fff02fee 366// event loop
fe4da5cc 367 while(1)
368 {
084c1b4a 369 fPythia->Pyevnt();
11dfaf8d 370 if (gAlice->GetEvNumber()>=fDebugEventFirst &&
371 gAlice->GetEvNumber()<=fDebugEventLast) fPythia->Pylist(1);
fe4da5cc 372 fTrials++;
47fc6bd5 373
fff02fee 374 fPythia->ImportParticles(fParticles,"All");
375
376//
377//
378//
379 Int_t i;
380
381 Int_t np = fParticles->GetEntriesFast();
a0b2b296 382 if (np == 0 ) continue;
383// Get event vertex and discard the event if the Z coord. is too big
4c07486d 384 TParticle *iparticle = (TParticle *) fParticles->At(0);
385 Float_t distz = iparticle->Vz()/10.;
386 if(TMath::Abs(distz)>fCutVertexZ*fOsigma[2]) continue;
a0b2b296 387//
4c07486d 388 fEventVertex[0] = iparticle->Vx()/10.+fOrigin.At(0);
389 fEventVertex[1] = iparticle->Vy()/10.+fOrigin.At(1);
390 fEventVertex[2] = iparticle->Vz()/10.+fOrigin.At(2);
a0b2b296 391//
fff02fee 392 Int_t* pParent = new Int_t[np];
393 Int_t* pSelected = new Int_t[np];
394 Int_t* trackIt = new Int_t[np];
b9817493 395 for (i=0; i< np; i++) {
fff02fee 396 pParent[i] = -1;
397 pSelected[i] = 0;
719b6b8a 398 trackIt[i] = 0;
fff02fee 399 }
719b6b8a 400 // printf("\n **************************************************%d\n",np);
401 Int_t nc = 0; // Total n. of selected particles
402 Int_t nParents = 0; // Selected parents
403 Int_t nTkbles = 0; // Trackable particles
5f42cc16 404 if (fProcess != kPyMb && fProcess != kPyJets && fProcess != kPyDirectGamma &&
405 fProcess != kPyMbNonDiffr) {
fd8fb861 406
b9817493 407 for (i = 0; i<np; i++) {
c5d36e84 408 iparticle = (TParticle *) fParticles->At(i);
23211d3e 409 Int_t ks = iparticle->GetStatusCode();
a8228d85 410 kf = CheckPDGCode(iparticle->GetPdgCode());
fff02fee 411// No initial state partons
2a0e6f5b 412 if (ks==21) continue;
fe4da5cc 413//
fff02fee 414// Heavy Flavor Selection
5be1fe76 415//
fff02fee 416 // quark ?
417 kf = TMath::Abs(kf);
418 Int_t kfl = kf;
419 // meson ?
420 if (kfl > 10) kfl/=100;
421 // baryon
422 if (kfl > 10) kfl/=10;
423 if (kfl > 10) kfl/=10;
424
425 Int_t ipa = iparticle->GetFirstMother()-1;
426 Int_t kfMo = 0;
427
428 if (ipa > -1) {
429 TParticle * mother = (TParticle *) fParticles->At(ipa);
430 kfMo = TMath::Abs(mother->GetPdgCode());
431 }
432// printf("\n particle (all) %d %d %d", i, pSelected[i], kf);
719b6b8a 433 // What to keep in Stack?
434 Bool_t flavorOK = kFALSE;
435 Bool_t selectOK = kFALSE;
436 if (fFeedDownOpt) {
437 if (kfl >= fFlavorSelect) flavorOK = kTRUE;
438 } else {
439 if (kfl > fFlavorSelect) {
440 nc = -1;
441 break;
442 }
443 if (kfl == fFlavorSelect) flavorOK = kTRUE;
444 }
445 switch (fStackFillOpt) {
446 case kFlavorSelection:
447 selectOK = kTRUE;
448 break;
449 case kParentSelection:
450 if (ParentSelected(kf) || kf <= 10) selectOK = kTRUE;
451 break;
452 }
453 if (flavorOK && selectOK) {
5be1fe76 454//
fff02fee 455// Heavy flavor hadron or quark
fe4da5cc 456//
fff02fee 457// Kinematic seletion on final state heavy flavor mesons
458 if (ParentSelected(kf) && !KinematicSelection(iparticle, 0))
459 {
719b6b8a 460 continue;
fff02fee 461 }
462 pSelected[i] = 1;
719b6b8a 463 if (ParentSelected(kf)) ++nParents; // Update parent count
fff02fee 464// printf("\n particle (HF) %d %d %d", i, pSelected[i], kf);
465 } else {
466// Kinematic seletion on decay products
467 if (fCutOnChild && ParentSelected(kfMo) && ChildSelected(kf)
468 && !KinematicSelection(iparticle, 1))
469 {
719b6b8a 470 continue;
fff02fee 471 }
fe4da5cc 472//
fff02fee 473// Decay products
474// Select if mother was selected and is not tracked
475
476 if (pSelected[ipa] &&
477 !trackIt[ipa] && // mother will be tracked ?
478 kfMo != 5 && // mother is b-quark, don't store fragments
479 kfMo != 4 && // mother is c-quark, don't store fragments
480 kf != 92) // don't store string
481 {
fe4da5cc 482//
fff02fee 483// Semi-stable or de-selected: diselect decay products:
fe4da5cc 484//
5be1fe76 485//
47fc6bd5 486 if (pSelected[i] == -1 || fDecayer->GetLifetime(kf) > fMaxLifeTime)
fff02fee 487 {
488 Int_t ipF = iparticle->GetFirstDaughter();
489 Int_t ipL = iparticle->GetLastDaughter();
490 if (ipF > 0) for (j = ipF-1; j < ipL; j++) pSelected[j] = -1;
491 }
492// printf("\n particle (decay) %d %d %d", i, pSelected[i], kf);
493 pSelected[i] = (pSelected[i] == -1) ? 0 : 1;
494 }
495 }
496 if (pSelected[i] == -1) pSelected[i] = 0;
497 if (!pSelected[i]) continue;
719b6b8a 498 // Count quarks only if you did not include fragmentation
499 if (fFragmentation && kf <= 10) continue;
fff02fee 500 nc++;
501// Decision on tracking
502 trackIt[i] = 0;
503//
504// Track final state particle
505 if (ks == 1) trackIt[i] = 1;
506// Track semi-stable particles
8cdfd303 507 if ((ks ==1) || (fDecayer->GetLifetime(kf) > fMaxLifeTime)) trackIt[i] = 1;
fff02fee 508// Track particles selected by process if undecayed.
509 if (fForceDecay == kNoDecay) {
510 if (ParentSelected(kf)) trackIt[i] = 1;
511 } else {
512 if (ParentSelected(kf)) trackIt[i] = 0;
513 }
719b6b8a 514 if (trackIt[i] == 1) ++nTkbles; // Update trackable counter
fff02fee 515//
516//
517
518 } // particle selection loop
719b6b8a 519 if (nc > 0) {
b9817493 520 for (i = 0; i<np; i++) {
fff02fee 521 if (!pSelected[i]) continue;
522 TParticle * iparticle = (TParticle *) fParticles->At(i);
523 kf = CheckPDGCode(iparticle->GetPdgCode());
5ec84200 524 Int_t ks = iparticle->GetStatusCode();
a0b2b296 525 p[0] = iparticle->Px();
526 p[1] = iparticle->Py();
527 p[2] = iparticle->Pz();
528 origin[0] = fOrigin[0]+iparticle->Vx()/10.;
529 origin[1] = fOrigin[1]+iparticle->Vy()/10.;
530 origin[2] = fOrigin[2]+iparticle->Vz()/10.;
531 Float_t tof = kconv*iparticle->T();
532 Int_t ipa = iparticle->GetFirstMother()-1;
fff02fee 533 Int_t iparent = (ipa > -1) ? pParent[ipa] : -1;
a99cf51f 534 SetTrack(fTrackIt*trackIt[i] ,
5ec84200 535 iparent, kf, p, origin, polar, tof, kPPrimary, nt, 1., ks);
fff02fee 536 pParent[i] = nt;
a99cf51f 537 KeepTrack(nt);
fff02fee 538 } // SetTrack loop
539 }
540 } else {
541 nc = GenerateMB();
5be1fe76 542 } // mb ?
fff02fee 543
b9817493 544 if (pParent) delete[] pParent;
545 if (pSelected) delete[] pSelected;
546 if (trackIt) delete[] trackIt;
547
fe4da5cc 548 if (nc > 0) {
719b6b8a 549 switch (fCountMode) {
550 case kCountAll:
551 // printf(" Count all \n");
552 jev += nc;
553 break;
554 case kCountParents:
555 // printf(" Count parents \n");
556 jev += nParents;
557 break;
558 case kCountTrackables:
559 // printf(" Count trackable \n");
560 jev += nTkbles;
561 break;
562 }
5ddeb374 563 if (jev >= fNpart || fNpart == -1) {
fe4da5cc 564 fKineBias=Float_t(fNpart)/Float_t(fTrials);
23211d3e 565 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
fd8fb861 566 MakeHeader();
fe4da5cc 567 break;
568 }
569 }
570 } // event loop
a99cf51f 571 SetHighWaterMark(nt);
fe4da5cc 572// adjust weight due to kinematic selection
573 AdjustWeights();
574// get cross-section
575 fXsection=fPythia->GetPARI(1);
576}
577
fff02fee 578Int_t AliGenPythia::GenerateMB()
fe4da5cc 579{
5ec84200 580//
581// Min Bias selection and other global selections
582//
fff02fee 583 Int_t i, kf, nt, iparent;
584 Int_t nc = 0;
585 Float_t p[3];
586 Float_t polar[3] = {0,0,0};
587 Float_t origin[3] = {0,0,0};
fff02fee 588// converts from mm/c to s
589 const Float_t kconv=0.001/2.999792458e8;
4451ef92 590
fff02fee 591 Int_t np = fParticles->GetEntriesFast();
592 Int_t* pParent = new Int_t[np];
b9817493 593 for (i=0; i< np; i++) pParent[i] = -1;
b2bb450d 594 if (fProcess == kPyJets || fProcess == kPyDirectGamma) {
988b118b 595 TParticle* jet1 = (TParticle *) fParticles->At(6);
596 TParticle* jet2 = (TParticle *) fParticles->At(7);
597 if (!CheckTrigger(jet1, jet2)) return 0;
598 }
599
b9817493 600 for (i = 0; i<np; i++) {
fff02fee 601 Int_t trackIt = 0;
602 TParticle * iparticle = (TParticle *) fParticles->At(i);
603 kf = CheckPDGCode(iparticle->GetPdgCode());
604 Int_t ks = iparticle->GetStatusCode();
605 Int_t km = iparticle->GetFirstMother();
606// printf("\n Particle: %d %d %d", i, kf, ks);
607
608 if ((ks == 1 && kf!=0 && KinematicSelection(iparticle, 0)) ||
609 (ks != 1) ||
610 (fProcess == kPyJets && ks == 21 && km == 0 && i>1)) {
611 nc++;
612 if (ks == 1) trackIt = 1;
613 Int_t ipa = iparticle->GetFirstMother()-1;
35967770 614
fff02fee 615 iparent = (ipa > -1) ? pParent[ipa] : -1;
35967770 616
fe4da5cc 617//
fff02fee 618// store track information
a0b2b296 619 p[0] = iparticle->Px();
620 p[1] = iparticle->Py();
621 p[2] = iparticle->Pz();
622 origin[0] = fOrigin[0]+iparticle->Vx()/10.;
623 origin[1] = fOrigin[1]+iparticle->Vy()/10.;
624 origin[2] = fOrigin[2]+iparticle->Vz()/10.;
fff02fee 625 Float_t tof=kconv*iparticle->T();
a99cf51f 626 SetTrack(fTrackIt*trackIt, iparent, kf, p, origin, polar,
35967770 627 tof, kPPrimary, nt, 1., ks);
a99cf51f 628 KeepTrack(nt);
fff02fee 629 pParent[i] = nt;
630 } // select particle
631 } // particle loop
632
633 if (pParent) delete[] pParent;
fe4da5cc 634
fff02fee 635 printf("\n I've put %i particles on the stack \n",nc);
fff02fee 636 return nc;
637}
fe4da5cc 638
fe4da5cc 639
fff02fee 640void AliGenPythia::FinishRun()
641{
642// Print x-section summary
643 fPythia->Pystat(1);
fe4da5cc 644}
fff02fee 645
fe4da5cc 646void AliGenPythia::AdjustWeights()
647{
5ddeb374 648// Adjust the weights after generation of all events
649//
5ddeb374 650 TParticle *part;
fe4da5cc 651 Int_t ntrack=gAlice->GetNtrack();
652 for (Int_t i=0; i<ntrack; i++) {
2ab0c725 653 part= gAlice->Particle(i);
5ddeb374 654 part->SetWeight(part->GetWeight()*fKineBias);
fe4da5cc 655 }
656}
811826d8 657
658void AliGenPythia::SetNuclei(Int_t a1, Int_t a2)
659{
660// Treat protons as inside nuclei with mass numbers a1 and a2
661 fNucA1 = a1;
662 fNucA2 = a2;
663}
fff02fee 664
665
6d4dd317 666void AliGenPythia::MakeHeader() const
fff02fee 667{
668// Builds the event header, to be called after each event
669 AliGenEventHeader* header = new AliGenPythiaEventHeader("Pythia");
c5d36e84 670 ((AliGenPythiaEventHeader*) header)->SetProcessType(fPythia->GetMSTI(1));
fd8fb861 671 ((AliGenPythiaEventHeader*) header)->SetTrials(fTrials);
c5d36e84 672 header->SetPrimaryVertex(fEventVertex);
673 gAlice->SetGenEventHeader(header);
fff02fee 674}
811826d8 675
988b118b 676
5ec84200 677Bool_t AliGenPythia::CheckTrigger(TParticle* jet1, TParticle* jet2) const
988b118b 678{
679// Check the kinematic trigger condition
680//
b2bb450d 681 Double_t eta[2];
682 eta[0] = jet1->Eta();
683 eta[1] = jet2->Eta();
684 Double_t phi[2];
685 phi[0] = jet1->Phi();
686 phi[1] = jet2->Phi();
687 Int_t pdg[2];
688 pdg[0] = jet1->GetPdgCode();
689 pdg[1] = jet2->GetPdgCode();
988b118b 690 Bool_t triggered = kFALSE;
b2bb450d 691
692 if (fProcess == kPyJets) {
693 //Check eta range first...
694 if ((eta[0] < fEtaMaxJet && eta[0] > fEtaMinJet) ||
695 (eta[1] < fEtaMaxJet && eta[1] > fEtaMinJet))
696 {
697 //Eta is okay, now check phi range
698 if ((phi[0] < fPhiMaxJet && phi[0] > fPhiMinJet) ||
699 (phi[1] < fPhiMaxJet && phi[1] > fPhiMinJet))
700 {
701 triggered = kTRUE;
702 }
703 }
704 } else {
705 Int_t ij = 0;
706 Int_t ig = 1;
707 if (pdg[0] == kGamma) {
708 ij = 1;
709 ig = 0;
710 }
711 //Check eta range first...
712 if ((eta[ij] < fEtaMaxJet && eta[ij] > fEtaMinJet) &&
713 (eta[ig] < fEtaMaxGamma && eta[ig] > fEtaMinGamma))
714 {
715 //Eta is okay, now check phi range
716 if ((phi[ij] < fPhiMaxJet && phi[ij] > fPhiMinJet) &&
717 (phi[ig] < fPhiMaxGamma && phi[ig] > fPhiMinGamma))
718 {
719 triggered = kTRUE;
720 }
721 }
988b118b 722 }
b2bb450d 723
724
988b118b 725 return triggered;
726}
811826d8 727
f87cfe57 728AliGenPythia& AliGenPythia::operator=(const AliGenPythia& rhs)
729{
730// Assignment operator
731 return *this;
732}
fe4da5cc 733
734
811826d8 735
a8a6107b 736#ifdef never
18edb254 737void AliGenPythia::Streamer(TBuffer &R__b)
738{
739 // Stream an object of class AliGenPythia.
740
741 if (R__b.IsReading()) {
742 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
743 AliGenerator::Streamer(R__b);
744 R__b >> (Int_t&)fProcess;
745 R__b >> (Int_t&)fStrucFunc;
746 R__b >> (Int_t&)fForceDecay;
747 R__b >> fEnergyCMS;
748 R__b >> fKineBias;
749 R__b >> fTrials;
750 fParentSelect.Streamer(R__b);
751 fChildSelect.Streamer(R__b);
752 R__b >> fXsection;
753// (AliPythia::Instance())->Streamer(R__b);
754 R__b >> fPtHardMin;
755 R__b >> fPtHardMax;
756// if (fDecayer) fDecayer->Streamer(R__b);
757 } else {
758 R__b.WriteVersion(AliGenPythia::IsA());
759 AliGenerator::Streamer(R__b);
760 R__b << (Int_t)fProcess;
761 R__b << (Int_t)fStrucFunc;
762 R__b << (Int_t)fForceDecay;
763 R__b << fEnergyCMS;
764 R__b << fKineBias;
765 R__b << fTrials;
766 fParentSelect.Streamer(R__b);
767 fChildSelect.Streamer(R__b);
768 R__b << fXsection;
769// R__b << fPythia;
770 R__b << fPtHardMin;
771 R__b << fPtHardMax;
772 // fDecayer->Streamer(R__b);
773 }
774}
a8a6107b 775#endif
18edb254 776