1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 Revision 1.45 2001/11/28 08:06:52 morsch
19 Use fMaxLifeTime parameter.
21 Revision 1.44 2001/11/27 13:13:07 morsch
22 Maximum lifetime for long-lived particles to be put on the stack is parameter.
23 It can be set via SetMaximumLifetime(..).
25 Revision 1.43 2001/10/21 18:35:56 hristov
26 Several pointers were set to zero in the default constructors to avoid memory management problems
28 Revision 1.42 2001/10/15 08:21:55 morsch
29 Vertex truncation settings moved to AliGenMC.
31 Revision 1.41 2001/10/08 08:45:42 morsch
32 Possibility of vertex cut added.
34 Revision 1.40 2001/09/25 11:30:23 morsch
35 Pass event vertex to header.
37 Revision 1.39 2001/07/27 17:09:36 morsch
38 Use local SetTrack, KeepTrack and SetHighWaterMark methods
39 to delegate either to local stack or to stack owned by AliRun.
40 (Piotr Skowronski, A.M.)
42 Revision 1.38 2001/07/13 10:58:54 morsch
43 - Some coded moved to AliGenMC
44 - Improved handling of secondary vertices.
46 Revision 1.37 2001/06/28 11:17:28 morsch
47 SetEventListRange setter added. Events in specified range are listed for
48 debugging. (Yuri Kharlov)
50 Revision 1.36 2001/03/30 07:05:49 morsch
51 Final print-out in finish run.
52 Write parton system for jet-production (preliminary solution).
54 Revision 1.35 2001/03/09 13:03:40 morsch
55 Process_t and Struc_Func_t moved to AliPythia.h
57 Revision 1.34 2001/02/14 15:50:40 hristov
58 The last particle in event marked using SetHighWaterMark
60 Revision 1.33 2001/01/30 09:23:12 hristov
61 Streamers removed (R.Brun)
63 Revision 1.32 2001/01/26 19:55:51 hristov
64 Major upgrade of AliRoot code
66 Revision 1.31 2001/01/17 10:54:31 hristov
67 Better protection against FPE
69 Revision 1.30 2000/12/18 08:55:35 morsch
70 Make AliPythia dependent generartors work with new scheme of random number generation
72 Revision 1.29 2000/12/04 11:22:03 morsch
73 Init of sRandom as in 1.15
75 Revision 1.28 2000/12/02 11:41:39 morsch
76 Use SetRandom() to initialize random number generator in constructor.
78 Revision 1.27 2000/11/30 20:29:02 morsch
79 Initialise static variable sRandom in constructor: sRandom = fRandom;
81 Revision 1.26 2000/11/30 07:12:50 alibrary
82 Introducing new Rndm and QA classes
84 Revision 1.25 2000/10/18 19:11:27 hristov
85 Division by zero fixed
87 Revision 1.24 2000/09/18 10:41:35 morsch
88 Add possibility to use nuclear structure functions from PDF library V8.
90 Revision 1.23 2000/09/14 14:05:40 morsch
93 Revision 1.22 2000/09/14 14:02:22 morsch
94 - Correct conversion from mm to cm when passing particle vertex to MC.
95 - Correct handling of fForceDecay == all.
97 Revision 1.21 2000/09/12 14:14:55 morsch
98 Call fDecayer->ForceDecay() at the beginning of Generate().
100 Revision 1.20 2000/09/06 14:29:33 morsch
101 Use AliPythia for event generation an AliDecayPythia for decays.
102 Correct handling of "nodecay" option
104 Revision 1.19 2000/07/11 18:24:56 fca
105 Coding convention corrections + few minor bug fixes
107 Revision 1.18 2000/06/30 12:40:34 morsch
108 Pythia takes care of vertex smearing. Correct conversion from Pythia units (mm) to
111 Revision 1.17 2000/06/09 20:34:07 morsch
112 All coding rule violations except RS3 corrected
114 Revision 1.16 2000/05/15 15:04:20 morsch
115 The full event is written for fNtrack = -1
116 Coding rule violations corrected.
118 Revision 1.15 2000/04/26 10:14:24 morsch
119 Particles array has one entry more than pythia particle list. Upper bound of
120 particle loop changed to np-1 (R. Guernane, AM)
122 Revision 1.14 2000/04/05 08:36:13 morsch
123 Check status code of particles in Pythia event
124 to avoid double counting as partonic state and final state particle.
126 Revision 1.13 1999/11/09 07:38:48 fca
127 Changes for compatibility with version 2.23 of ROOT
129 Revision 1.12 1999/11/03 17:43:20 fca
130 New version from G.Martinez & A.Morsch
132 Revision 1.11 1999/09/29 09:24:14 fca
133 Introduction of the Copyright and cvs Log
136 #include "AliGenPythia.h"
137 #include "AliGenPythiaEventHeader.h"
138 #include "AliDecayerPythia.h"
140 #include "AliPythia.h"
142 #include <TParticle.h>
145 ClassImp(AliGenPythia)
147 AliGenPythia::AliGenPythia()
150 // Default Constructor
153 fDecayer = new AliDecayerPythia();
159 AliGenPythia::AliGenPythia(Int_t npart)
162 // default charm production at 5. 5 TeV
164 // structure function GRVHO
174 fDecayer = new AliDecayerPythia();
175 // Set random number generator
178 // Produced particles
179 fParticles = new TClonesArray("TParticle",1000);
186 AliGenPythia::AliGenPythia(const AliGenPythia & Pythia)
191 AliGenPythia::~AliGenPythia()
196 void AliGenPythia::SetEventListRange(Int_t eventFirst, Int_t eventLast)
198 // Set a range of event numbers, for which a table
199 // of generated particle will be printed
200 fDebugEventFirst = eventFirst;
201 fDebugEventLast = eventLast;
202 if (fDebugEventLast==-1) fDebugEventLast=fDebugEventFirst;
205 void AliGenPythia::Init()
208 SetMC(AliPythia::Instance());
209 fPythia=(AliPythia*) fgMCEvGen;
211 fParentWeight=1./Float_t(fNpart);
213 // Forward Paramters to the AliPythia object
214 fDecayer->SetForceDecay(fForceDecay);
218 fPythia->SetCKIN(3,fPtHardMin);
219 fPythia->SetCKIN(4,fPtHardMax);
220 if (fNucA1 > 0 && fNucA2 > 0) fPythia->SetNuclei(fNucA1, fNucA2);
221 fPythia->ProcInit(fProcess,fEnergyCMS,fStrucFunc);
223 // fPythia->Pylist(0);
224 // fPythia->Pystat(2);
225 // Parent and Children Selection
229 fParentSelect[0] = 411;
230 fParentSelect[1] = 421;
231 fParentSelect[2] = 431;
232 fParentSelect[3] = 4122;
235 case kPyCharmUnforced:
236 fParentSelect[0] = 411;
237 fParentSelect[1] = 421;
238 fParentSelect[2] = 431;
239 fParentSelect[3]= 4122;
243 fParentSelect[0]= 511;
244 fParentSelect[1]= 521;
245 fParentSelect[2]= 531;
246 fParentSelect[3]= 5122;
247 fParentSelect[4]= 5132;
248 fParentSelect[5]= 5232;
249 fParentSelect[6]= 5332;
252 case kPyBeautyUnforced:
253 fParentSelect[0] = 511;
254 fParentSelect[1] = 521;
255 fParentSelect[2] = 531;
256 fParentSelect[3] = 5122;
257 fParentSelect[4] = 5132;
258 fParentSelect[5] = 5232;
259 fParentSelect[6] = 5332;
264 fParentSelect[0] = 443;
274 void AliGenPythia::Generate()
276 // Generate one event
277 fDecayer->ForceDecay();
279 Float_t polar[3] = {0,0,0};
280 Float_t origin[3] = {0,0,0};
282 // converts from mm/c to s
283 const Float_t kconv=0.001/2.999792458e8;
290 // Set collision vertex position
291 if(fVertexSmear==kPerEvent) {
292 fPythia->SetMSTP(151,1);
294 fPythia->SetPARP(151+j, fOsigma[j]*10.);
296 } else if (fVertexSmear==kPerTrack) {
297 fPythia->SetMSTP(151,0);
303 if (gAlice->GetEvNumber()>=fDebugEventFirst &&
304 gAlice->GetEvNumber()<=fDebugEventLast) fPythia->Pylist(1);
307 fPythia->ImportParticles(fParticles,"All");
314 Int_t np = fParticles->GetEntriesFast();
315 if (np == 0 ) continue;
316 // Get event vertex and discard the event if the Z coord. is too big
317 TParticle *iparticle = (TParticle *) fParticles->At(0);
318 Float_t distz = iparticle->Vz()/10.;
319 if(TMath::Abs(distz)>fCutVertexZ*fOsigma[2]) continue;
321 fEventVertex[0] = iparticle->Vx()/10.+fOrigin.At(0);
322 fEventVertex[1] = iparticle->Vy()/10.+fOrigin.At(1);
323 fEventVertex[2] = iparticle->Vz()/10.+fOrigin.At(2);
325 Int_t* pParent = new Int_t[np];
326 Int_t* pSelected = new Int_t[np];
327 Int_t* trackIt = new Int_t[np];
328 for (i=0; i< np-1; i++) {
332 printf("\n **************************************************%d\n",np);
334 if (fProcess != kPyMb && fProcess != kPyJets && fProcess != kPyDirectGamma) {
335 for (i = 0; i<np-1; i++) {
336 iparticle = (TParticle *) fParticles->At(i);
337 Int_t ks = iparticle->GetStatusCode();
338 kf = CheckPDGCode(iparticle->GetPdgCode());
339 // No initial state partons
340 if (ks==21) continue;
342 // Heavy Flavor Selection
348 if (kfl > 10) kfl/=100;
350 if (kfl > 10) kfl/=10;
351 if (kfl > 10) kfl/=10;
353 Int_t ipa = iparticle->GetFirstMother()-1;
357 TParticle * mother = (TParticle *) fParticles->At(ipa);
358 kfMo = TMath::Abs(mother->GetPdgCode());
360 // printf("\n particle (all) %d %d %d", i, pSelected[i], kf);
361 if (kfl >= fFlavorSelect) {
363 // Heavy flavor hadron or quark
365 // Kinematic seletion on final state heavy flavor mesons
366 if (ParentSelected(kf) && !KinematicSelection(iparticle, 0))
372 // printf("\n particle (HF) %d %d %d", i, pSelected[i], kf);
374 // Kinematic seletion on decay products
375 if (fCutOnChild && ParentSelected(kfMo) && ChildSelected(kf)
376 && !KinematicSelection(iparticle, 1))
383 // Select if mother was selected and is not tracked
385 if (pSelected[ipa] &&
386 !trackIt[ipa] && // mother will be tracked ?
387 kfMo != 5 && // mother is b-quark, don't store fragments
388 kfMo != 4 && // mother is c-quark, don't store fragments
389 kf != 92) // don't store string
392 // Semi-stable or de-selected: diselect decay products:
395 if (pSelected[i] == -1 || fDecayer->GetLifetime(kf) > fMaxLifeTime)
397 Int_t ipF = iparticle->GetFirstDaughter();
398 Int_t ipL = iparticle->GetLastDaughter();
399 if (ipF > 0) for (j = ipF-1; j < ipL; j++) pSelected[j] = -1;
401 // printf("\n particle (decay) %d %d %d", i, pSelected[i], kf);
402 pSelected[i] = (pSelected[i] == -1) ? 0 : 1;
405 if (pSelected[i] == -1) pSelected[i] = 0;
406 if (!pSelected[i]) continue;
408 // Decision on tracking
411 // Track final state particle
412 if (ks == 1) trackIt[i] = 1;
413 // Track semi-stable particles
414 if ((ks ==1) || (fDecayer->GetLifetime(kf) > fMaxLifeTime)) trackIt[i] = 1;
415 // Track particles selected by process if undecayed.
416 if (fForceDecay == kNoDecay) {
417 if (ParentSelected(kf)) trackIt[i] = 1;
419 if (ParentSelected(kf)) trackIt[i] = 0;
424 } // particle selection loop
426 for (i = 0; i<np-1; i++) {
427 if (!pSelected[i]) continue;
428 TParticle * iparticle = (TParticle *) fParticles->At(i);
429 kf = CheckPDGCode(iparticle->GetPdgCode());
430 p[0] = iparticle->Px();
431 p[1] = iparticle->Py();
432 p[2] = iparticle->Pz();
433 origin[0] = fOrigin[0]+iparticle->Vx()/10.;
434 origin[1] = fOrigin[1]+iparticle->Vy()/10.;
435 origin[2] = fOrigin[2]+iparticle->Vz()/10.;
436 Float_t tof = kconv*iparticle->T();
437 Int_t ipa = iparticle->GetFirstMother()-1;
438 Int_t iparent = (ipa > -1) ? pParent[ipa] : -1;
439 SetTrack(fTrackIt*trackIt[i] ,
440 iparent, kf, p, origin, polar, tof, kPPrimary, nt, 1.);
451 if (jev >= fNpart || fNpart == -1) {
452 fKineBias=Float_t(fNpart)/Float_t(fTrials);
453 printf("\n Trials: %i %i %i\n",fTrials, fNpart, jev);
458 SetHighWaterMark(nt);
459 // adjust weight due to kinematic selection
462 fXsection=fPythia->GetPARI(1);
465 Int_t AliGenPythia::GenerateMB()
467 Int_t i, kf, nt, iparent;
470 Float_t polar[3] = {0,0,0};
471 Float_t origin[3] = {0,0,0};
472 // converts from mm/c to s
473 const Float_t kconv=0.001/2.999792458e8;
475 Int_t np = fParticles->GetEntriesFast();
476 Int_t* pParent = new Int_t[np];
477 for (i=0; i< np-1; i++) pParent[i] = -1;
478 if (fProcess == kPyJets) {
479 TParticle* jet1 = (TParticle *) fParticles->At(6);
480 TParticle* jet2 = (TParticle *) fParticles->At(7);
481 if (!CheckTrigger(jet1, jet2)) return 0;
484 for (i = 0; i<np-1; i++) {
486 TParticle * iparticle = (TParticle *) fParticles->At(i);
487 kf = CheckPDGCode(iparticle->GetPdgCode());
488 Int_t ks = iparticle->GetStatusCode();
489 Int_t km = iparticle->GetFirstMother();
490 // printf("\n Particle: %d %d %d", i, kf, ks);
492 if ((ks == 1 && kf!=0 && KinematicSelection(iparticle, 0)) ||
494 (fProcess == kPyJets && ks == 21 && km == 0 && i>1)) {
496 if (ks == 1) trackIt = 1;
497 Int_t ipa = iparticle->GetFirstMother()-1;
499 iparent = (ipa > -1) ? pParent[ipa] : -1;
502 // store track information
503 p[0] = iparticle->Px();
504 p[1] = iparticle->Py();
505 p[2] = iparticle->Pz();
506 origin[0] = fOrigin[0]+iparticle->Vx()/10.;
507 origin[1] = fOrigin[1]+iparticle->Vy()/10.;
508 origin[2] = fOrigin[2]+iparticle->Vz()/10.;
509 Float_t tof=kconv*iparticle->T();
510 SetTrack(fTrackIt*trackIt, iparent, kf, p, origin, polar,
517 if (pParent) delete[] pParent;
519 printf("\n I've put %i particles on the stack \n",nc);
525 void AliGenPythia::FinishRun()
527 // Print x-section summary
531 void AliGenPythia::AdjustWeights()
533 // Adjust the weights after generation of all events
536 Int_t ntrack=gAlice->GetNtrack();
537 for (Int_t i=0; i<ntrack; i++) {
538 part= gAlice->Particle(i);
539 part->SetWeight(part->GetWeight()*fKineBias);
543 void AliGenPythia::SetNuclei(Int_t a1, Int_t a2)
545 // Treat protons as inside nuclei with mass numbers a1 and a2
551 void AliGenPythia::MakeHeader()
553 // Builds the event header, to be called after each event
554 AliGenEventHeader* header = new AliGenPythiaEventHeader("Pythia");
555 ((AliGenPythiaEventHeader*) header)->SetProcessType(fPythia->GetMSTI(1));
556 header->SetPrimaryVertex(fEventVertex);
557 gAlice->SetGenEventHeader(header);
561 Bool_t AliGenPythia::CheckTrigger(TParticle* jet1, TParticle* jet2)
563 // Check the kinematic trigger condition
565 Double_t eta1 = jet1->Eta();
566 Double_t eta2 = jet2->Eta();
567 Double_t phi1 = jet1->Phi();
568 Double_t phi2 = jet2->Phi();
569 Bool_t triggered = kFALSE;
570 //Check eta range first...
571 if ((eta1 < fEtaMaxJet && eta1 > fEtaMinJet) ||
572 (eta2 < fEtaMaxJet && eta2 > fEtaMinJet))
574 //Eta is okay, now check phi range
575 if ((phi1 < fPhiMaxJet && phi1 > fPhiMinJet) ||
576 (phi2 < fPhiMaxJet && phi2 > fPhiMinJet))
584 AliGenPythia& AliGenPythia::operator=(const AliGenPythia& rhs)
586 // Assignment operator
593 void AliGenPythia::Streamer(TBuffer &R__b)
595 // Stream an object of class AliGenPythia.
597 if (R__b.IsReading()) {
598 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
599 AliGenerator::Streamer(R__b);
600 R__b >> (Int_t&)fProcess;
601 R__b >> (Int_t&)fStrucFunc;
602 R__b >> (Int_t&)fForceDecay;
606 fParentSelect.Streamer(R__b);
607 fChildSelect.Streamer(R__b);
609 // (AliPythia::Instance())->Streamer(R__b);
612 // if (fDecayer) fDecayer->Streamer(R__b);
614 R__b.WriteVersion(AliGenPythia::IsA());
615 AliGenerator::Streamer(R__b);
616 R__b << (Int_t)fProcess;
617 R__b << (Int_t)fStrucFunc;
618 R__b << (Int_t)fForceDecay;
622 fParentSelect.Streamer(R__b);
623 fChildSelect.Streamer(R__b);
628 // fDecayer->Streamer(R__b);