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 **************************************************************************/
19 // Generator using the TPythia interface (via AliPythia)
20 // to generate pp collisions.
21 // Using SetNuclei() also nuclear modifications to the structure functions
22 // can be taken into account. This makes, of course, only sense for the
23 // generation of the products of hard processes (heavy flavor, jets ...)
25 // andreas.morsch@cern.ch
28 #include <TDatabasePDG.h>
29 #include <TParticle.h>
34 #include "AliDecayerPythia.h"
35 #include "AliGenPythia.h"
36 #include "AliHeader.h"
37 #include "AliGenPythiaEventHeader.h"
38 #include "AliPythia.h"
39 #include "AliPythiaRndm.h"
42 #include "AliRunLoader.h"
44 #include "pyquenCommon.h"
46 ClassImp(AliGenPythia)
49 AliGenPythia::AliGenPythia():
81 fDecayer(new AliDecayerPythia()),
89 fPhiMaxJet(2.* TMath::Pi()),
90 fJetReconstruction(kCell),
94 fPhiMaxGamma(2. * TMath::Pi()),
100 fPycellMinEtJet(10.),
101 fPycellMaxRadius(1.),
102 fStackFillOpt(kFlavorSelection),
104 fFragmentation(kTRUE),
110 fCountMode(kCountAll),
115 // Default Constructor
117 if (!AliPythiaRndm::GetPythiaRandom())
118 AliPythiaRndm::SetPythiaRandom(GetRandom());
121 AliGenPythia::AliGenPythia(Int_t npart)
133 fInteractionRate(0.),
147 fHadronisation(kTRUE),
149 fReadFromFile(kFALSE),
153 fDecayer(new AliDecayerPythia()),
154 fDebugEventFirst(-1),
161 fPhiMaxJet(2.* TMath::Pi()),
162 fJetReconstruction(kCell),
166 fPhiMaxGamma(2. * TMath::Pi()),
170 fPycellThreshold(0.),
172 fPycellMinEtJet(10.),
173 fPycellMaxRadius(1.),
174 fStackFillOpt(kFlavorSelection),
176 fFragmentation(kTRUE),
182 fCountMode(kCountAll),
187 // default charm production at 5. 5 TeV
189 // structure function GRVHO
192 fTitle= "Particle Generator using PYTHIA";
194 // Set random number generator
195 if (!AliPythiaRndm::GetPythiaRandom())
196 AliPythiaRndm::SetPythiaRandom(GetRandom());
197 fParticles = new TClonesArray("TParticle",1000);
201 AliGenPythia::AliGenPythia(const AliGenPythia & Pythia)
213 fInteractionRate(0.),
227 fHadronisation(kTRUE),
229 fReadFromFile(kFALSE),
233 fDecayer(new AliDecayerPythia()),
234 fDebugEventFirst(-1),
241 fPhiMaxJet(2.* TMath::Pi()),
242 fJetReconstruction(kCell),
246 fPhiMaxGamma(2. * TMath::Pi()),
250 fPycellThreshold(0.),
252 fPycellMinEtJet(10.),
253 fPycellMaxRadius(1.),
254 fStackFillOpt(kFlavorSelection),
256 fFragmentation(kTRUE),
262 fCountMode(kCountAll),
271 AliGenPythia::~AliGenPythia()
274 if(fEventsTime) delete fEventsTime;
277 void AliGenPythia::SetInteractionRate(Float_t rate,Float_t timewindow)
279 // Generate pileup using user specified rate
280 fInteractionRate = rate;
281 fTimeWindow = timewindow;
285 void AliGenPythia::GeneratePileup()
287 // Generate sub events time for pileup
289 if(fInteractionRate == 0.) {
290 Warning("GeneratePileup","Zero interaction specified. Skipping pileup generation.\n");
294 Int_t npart = NumberParticles();
296 Warning("GeneratePileup","Negative number of particles. Skipping pileup generation.\n");
300 if(fEventsTime) delete fEventsTime;
301 fEventsTime = new TArrayF(npart);
302 TArrayF &array = *fEventsTime;
303 for(Int_t ipart = 0; ipart < npart; ipart++)
306 Float_t eventtime = 0.;
309 eventtime += (AliPythiaRndm::GetPythiaRandom())->Exp(1./fInteractionRate);
310 if(eventtime > fTimeWindow) break;
311 array.Set(array.GetSize()+1);
312 array[array.GetSize()-1] = eventtime;
318 eventtime -= (AliPythiaRndm::GetPythiaRandom())->Exp(1./fInteractionRate);
319 if(TMath::Abs(eventtime) > fTimeWindow) break;
320 array.Set(array.GetSize()+1);
321 array[array.GetSize()-1] = eventtime;
324 SetNumberParticles(fEventsTime->GetSize());
327 void AliGenPythia::SetPycellParameters(Float_t etamax, Int_t neta, Int_t nphi,
328 Float_t thresh, Float_t etseed, Float_t minet, Float_t r)
330 // Set pycell parameters
331 fPycellEtaMax = etamax;
334 fPycellThreshold = thresh;
335 fPycellEtSeed = etseed;
336 fPycellMinEtJet = minet;
337 fPycellMaxRadius = r;
342 void AliGenPythia::SetEventListRange(Int_t eventFirst, Int_t eventLast)
344 // Set a range of event numbers, for which a table
345 // of generated particle will be printed
346 fDebugEventFirst = eventFirst;
347 fDebugEventLast = eventLast;
348 if (fDebugEventLast==-1) fDebugEventLast=fDebugEventFirst;
351 void AliGenPythia::Init()
355 SetMC(AliPythia::Instance());
356 fPythia=(AliPythia*) fMCEvGen;
359 fParentWeight=1./Float_t(fNpart);
361 // Forward Paramters to the AliPythia object
362 fDecayer->SetForceDecay(fForceDecay);
366 fPythia->SetCKIN(3,fPtHardMin);
367 fPythia->SetCKIN(4,fPtHardMax);
368 fPythia->SetCKIN(7,fYHardMin);
369 fPythia->SetCKIN(8,fYHardMax);
371 if (fAProjectile > 0 && fATarget > 0) fPythia->SetNuclei(fAProjectile, fATarget);
373 if (fFragmentation) {
374 fPythia->SetMSTP(111,1);
376 fPythia->SetMSTP(111,0);
380 // initial state radiation
381 fPythia->SetMSTP(61,fGinit);
382 // final state radiation
383 fPythia->SetMSTP(71,fGfinal);
386 fPythia->SetMSTP(91,1);
387 fPythia->SetPARP(91,fPtKick);
389 fPythia->SetMSTP(91,0);
394 fRL = AliRunLoader::Open(fFileName, "Partons");
395 fRL->LoadKinematics();
400 // Switch off Heavy Flavors on request
402 fPythia->SetMSTP(58, 3);
403 fPythia->SetMSTJ(45, 3);
404 for (Int_t i = 156; i <= 160; i++) fPythia->SetMDME(i, 1, 0);
407 fPythia->ProcInit(fProcess,fEnergyCMS,fStrucFunc);
409 // Parent and Children Selection
412 case kPyOldUEQ2ordered:
413 case kPyOldUEQ2ordered2:
417 case kPyCharmUnforced:
418 case kPyCharmPbPbMNR:
421 case kPyCharmppMNRwmi:
422 fParentSelect[0] = 411;
423 fParentSelect[1] = 421;
424 fParentSelect[2] = 431;
425 fParentSelect[3] = 4122;
431 fParentSelect[0] = 421;
434 case kPyDPlusPbPbMNR:
437 fParentSelect[0] = 411;
440 case kPyDPlusStrangePbPbMNR:
441 case kPyDPlusStrangepPbMNR:
442 case kPyDPlusStrangeppMNR:
443 fParentSelect[0] = 431;
447 case kPyBeautyPbPbMNR:
448 case kPyBeautypPbMNR:
450 case kPyBeautyppMNRwmi:
451 fParentSelect[0]= 511;
452 fParentSelect[1]= 521;
453 fParentSelect[2]= 531;
454 fParentSelect[3]= 5122;
455 fParentSelect[4]= 5132;
456 fParentSelect[5]= 5232;
457 fParentSelect[6]= 5332;
460 case kPyBeautyUnforced:
461 fParentSelect[0] = 511;
462 fParentSelect[1] = 521;
463 fParentSelect[2] = 531;
464 fParentSelect[3] = 5122;
465 fParentSelect[4] = 5132;
466 fParentSelect[5] = 5232;
467 fParentSelect[6] = 5332;
472 fParentSelect[0] = 443;
486 // JetFinder for Trigger
488 // Configure detector (EMCAL like)
490 fPythia->SetPARU(51, fPycellEtaMax);
491 fPythia->SetMSTU(51, fPycellNEta);
492 fPythia->SetMSTU(52, fPycellNPhi);
494 // Configure Jet Finder
496 fPythia->SetPARU(58, fPycellThreshold);
497 fPythia->SetPARU(52, fPycellEtSeed);
498 fPythia->SetPARU(53, fPycellMinEtJet);
499 fPythia->SetPARU(54, fPycellMaxRadius);
500 fPythia->SetMSTU(54, 2);
502 // This counts the total number of calls to Pyevnt() per run.
517 Warning("Init","SetNuclei used. Use SetProjectile + SetTarget instead. fDyBoost has been reset to 0\n");
521 fPythia->InitQuenching(0., 0.1, 0.6e6, 0);
525 void AliGenPythia::Generate()
527 // Generate one event
529 fDecayer->ForceDecay();
531 Float_t polar[3] = {0,0,0};
532 Float_t origin[3] = {0,0,0};
534 // converts from mm/c to s
535 const Float_t kconv=0.001/2.999792458e8;
545 // Set collision vertex position
546 if (fVertexSmear == kPerEvent) Vertex();
555 // Switch hadronisation off
557 fPythia->SetMSTJ(1, 0);
559 // Either produce new event or read partons from file
561 if (!fReadFromFile) {
567 fNpartons = fPythia->GetN();
569 printf("Loading Event %d\n",AliRunLoader::GetRunLoader()->GetEventNumber());
570 fRL->GetEvent(AliRunLoader::GetRunLoader()->GetEventNumber());
572 LoadEvent(fRL->Stack(), 0 , 1);
577 // Run quenching routine
581 } else if (fQuench == 2){
582 fPythia->Pyquen(208., 0, 0.);
585 // Switch hadronisation on
587 fPythia->SetMSTJ(1, 1);
589 // .. and perform hadronisation
590 // printf("Calling hadronisation %d\n", fPythia->GetN());
593 fPythia->ImportParticles(fParticles,"All");
601 Int_t np = fParticles->GetEntriesFast();
603 if (np == 0) continue;
607 Int_t* pParent = new Int_t[np];
608 Int_t* pSelected = new Int_t[np];
609 Int_t* trackIt = new Int_t[np];
610 for (i = 0; i < np; i++) {
616 Int_t nc = 0; // Total n. of selected particles
617 Int_t nParents = 0; // Selected parents
618 Int_t nTkbles = 0; // Trackable particles
619 if (fProcess != kPyMb && fProcess != kPyJets &&
620 fProcess != kPyDirectGamma &&
621 fProcess != kPyMbNonDiffr &&
622 fProcess != kPyMbMSEL1 &&
623 fProcess != kPyW && fProcess != kPyZ &&
624 fProcess != kPyCharmppMNRwmi && fProcess != kPyBeautyppMNRwmi) {
626 for (i = 0; i < np; i++) {
627 TParticle* iparticle = (TParticle *) fParticles->At(i);
628 Int_t ks = iparticle->GetStatusCode();
629 kf = CheckPDGCode(iparticle->GetPdgCode());
630 // No initial state partons
631 if (ks==21) continue;
633 // Heavy Flavor Selection
640 if (kfl > 100000) kfl %= 100000;
641 if (kfl > 10000) kfl %= 10000;
643 if (kfl > 10) kfl/=100;
645 if (kfl > 10) kfl/=10;
646 Int_t ipa = iparticle->GetFirstMother()-1;
649 // Establish mother daughter relation between heavy quarks and mesons
651 if (kf >= fFlavorSelect && kf <= 6) {
652 Int_t idau = iparticle->GetFirstDaughter() - 1;
654 TParticle* daughter = (TParticle *) fParticles->At(idau);
655 Int_t pdgD = daughter->GetPdgCode();
656 if (pdgD == 91 || pdgD == 92) {
657 Int_t jmin = daughter->GetFirstDaughter() - 1;
658 Int_t jmax = daughter->GetLastDaughter() - 1;
659 for (Int_t j = jmin; j <= jmax; j++)
660 ((TParticle *) fParticles->At(j))->SetFirstMother(i+1);
661 } // is string or cluster
667 TParticle * mother = (TParticle *) fParticles->At(ipa);
668 kfMo = TMath::Abs(mother->GetPdgCode());
671 // What to keep in Stack?
672 Bool_t flavorOK = kFALSE;
673 Bool_t selectOK = kFALSE;
675 if (kfl >= fFlavorSelect) flavorOK = kTRUE;
677 if (kfl > fFlavorSelect) {
681 if (kfl == fFlavorSelect) flavorOK = kTRUE;
683 switch (fStackFillOpt) {
684 case kFlavorSelection:
687 case kParentSelection:
688 if (ParentSelected(kf) || kf <= 10) selectOK = kTRUE;
691 if (flavorOK && selectOK) {
693 // Heavy flavor hadron or quark
695 // Kinematic seletion on final state heavy flavor mesons
696 if (ParentSelected(kf) && !KinematicSelection(iparticle, 0))
701 if (ParentSelected(kf)) ++nParents; // Update parent count
702 // printf("\n particle (HF) %d %d %d", i, pSelected[i], kf);
704 // Kinematic seletion on decay products
705 if (fCutOnChild && ParentSelected(kfMo) && ChildSelected(kf)
706 && !KinematicSelection(iparticle, 1))
712 // Select if mother was selected and is not tracked
714 if (pSelected[ipa] &&
715 !trackIt[ipa] && // mother will be tracked ?
716 kfMo != 5 && // mother is b-quark, don't store fragments
717 kfMo != 4 && // mother is c-quark, don't store fragments
718 kf != 92) // don't store string
721 // Semi-stable or de-selected: diselect decay products:
724 if (pSelected[i] == -1 || fDecayer->GetLifetime(kf) > fMaxLifeTime)
726 Int_t ipF = iparticle->GetFirstDaughter();
727 Int_t ipL = iparticle->GetLastDaughter();
728 if (ipF > 0) for (j = ipF-1; j < ipL; j++) pSelected[j] = -1;
730 // printf("\n particle (decay) %d %d %d", i, pSelected[i], kf);
731 pSelected[i] = (pSelected[i] == -1) ? 0 : 1;
734 if (pSelected[i] == -1) pSelected[i] = 0;
735 if (!pSelected[i]) continue;
736 // Count quarks only if you did not include fragmentation
737 if (fFragmentation && kf <= 10) continue;
740 // Decision on tracking
743 // Track final state particle
744 if (ks == 1) trackIt[i] = 1;
745 // Track semi-stable particles
746 if ((ks == 1) || (fDecayer->GetLifetime(kf) > fMaxLifeTime)) trackIt[i] = 1;
747 // Track particles selected by process if undecayed.
748 if (fForceDecay == kNoDecay) {
749 if (ParentSelected(kf)) trackIt[i] = 1;
751 if (ParentSelected(kf)) trackIt[i] = 0;
753 if (trackIt[i] == 1) ++nTkbles; // Update trackable counter
757 } // particle selection loop
759 for (i = 0; i<np; i++) {
760 if (!pSelected[i]) continue;
761 TParticle * iparticle = (TParticle *) fParticles->At(i);
762 kf = CheckPDGCode(iparticle->GetPdgCode());
763 Int_t ks = iparticle->GetStatusCode();
764 p[0] = iparticle->Px();
765 p[1] = iparticle->Py();
766 p[2] = iparticle->Pz();
767 p[3] = iparticle->Energy();
769 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
770 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
771 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
773 Float_t tof = kconv*iparticle->T();
774 Int_t ipa = iparticle->GetFirstMother()-1;
775 Int_t iparent = (ipa > -1) ? pParent[ipa] : -1;
777 PushTrack(fTrackIt*trackIt[i], iparent, kf,
778 p[0], p[1], p[2], p[3],
779 origin[0], origin[1], origin[2], tof,
780 polar[0], polar[1], polar[2],
781 kPPrimary, nt, 1., ks);
797 switch (fCountMode) {
799 // printf(" Count all \n");
803 // printf(" Count parents \n");
806 case kCountTrackables:
807 // printf(" Count trackable \n");
811 if (jev >= fNpart || fNpart == -1) {
812 fKineBias=Float_t(fNpart)/Float_t(fTrials);
814 fQ += fPythia->GetVINT(51);
815 fX1 += fPythia->GetVINT(41);
816 fX2 += fPythia->GetVINT(42);
817 fTrialsRun += fTrials;
824 SetHighWaterMark(nt);
825 // adjust weight due to kinematic selection
828 fXsection=fPythia->GetPARI(1);
831 Int_t AliGenPythia::GenerateMB()
834 // Min Bias selection and other global selections
836 Int_t i, kf, nt, iparent;
839 Float_t polar[3] = {0,0,0};
840 Float_t origin[3] = {0,0,0};
841 // converts from mm/c to s
842 const Float_t kconv=0.001/2.999792458e8;
846 Int_t np = (fHadronisation) ? fParticles->GetEntriesFast() : fNpartons;
850 Int_t* pParent = new Int_t[np];
851 for (i=0; i< np; i++) pParent[i] = -1;
852 if (fProcess == kPyJets || fProcess == kPyDirectGamma) {
853 TParticle* jet1 = (TParticle *) fParticles->At(6);
854 TParticle* jet2 = (TParticle *) fParticles->At(7);
855 if (!CheckTrigger(jet1, jet2)) {
861 if (fTriggerParticle) {
862 Bool_t triggered = kFALSE;
863 for (i = 0; i < np; i++) {
864 TParticle * iparticle = (TParticle *) fParticles->At(i);
865 kf = CheckPDGCode(iparticle->GetPdgCode());
866 if (kf != fTriggerParticle) continue;
867 if (iparticle->Pt() == 0.) continue;
868 if (TMath::Abs(iparticle->Eta()) > fTriggerEta) continue;
879 // Check if there is a ccbar or bbbar pair with at least one of the two
880 // in fYMin < y < fYMax
881 if (fProcess == kPyCharmppMNRwmi || fProcess == kPyBeautyppMNRwmi) {
883 Bool_t theQ=kFALSE,theQbar=kFALSE,inYcut=kFALSE;
886 for(i=0; i<np; i++) {
887 hvq = (TParticle*)fParticles->At(i);
888 pdgQ = hvq->GetPdgCode();
889 if(TMath::Abs(pdgQ) != fFlavorSelect) continue;
890 if(pdgQ>0) { theQ=kTRUE; } else { theQbar=kTRUE; }
891 yQ = 0.5*TMath::Log((hvq->Energy()+hvq->Pz()+1.e-13)/
892 (hvq->Energy()-hvq->Pz()+1.e-13));
893 if(yQ>fYMin && yQ<fYMax) inYcut=kTRUE;
895 if (!theQ || !theQbar || !inYcut) {
901 //Introducing child cuts in case kPyW, kPyZ, kPyMb, and kPyMbNonDiff
902 if ( (fProcess == kPyW || fProcess == kPyZ || fProcess == kPyMb || fProcess == kPyMbNonDiffr)
903 && (fCutOnChild == 1) ) {
904 if ( !CheckKinematicsOnChild() ) {
911 for (i = 0; i < np; i++) {
913 TParticle * iparticle = (TParticle *) fParticles->At(i);
914 kf = CheckPDGCode(iparticle->GetPdgCode());
915 Int_t ks = iparticle->GetStatusCode();
916 Int_t km = iparticle->GetFirstMother();
917 if ((ks == 1 && kf!=0 && KinematicSelection(iparticle, 0)) ||
919 (fProcess == kPyJets && ks == 21 && km == 0 && i>1)) {
921 if (ks == 1) trackIt = 1;
922 Int_t ipa = iparticle->GetFirstMother()-1;
924 iparent = (ipa > -1) ? pParent[ipa] : -1;
927 // store track information
928 p[0] = iparticle->Px();
929 p[1] = iparticle->Py();
930 p[2] = iparticle->Pz();
931 p[3] = iparticle->Energy();
934 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
935 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
936 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
938 Float_t tof = fEventTime + kconv * iparticle->T();
940 PushTrack(fTrackIt*trackIt, iparent, kf,
941 p[0], p[1], p[2], p[3],
942 origin[0], origin[1], origin[2], tof,
943 polar[0], polar[1], polar[2],
944 kPPrimary, nt, 1., ks);
946 // Special Treatment to store color-flow
948 if (ks == 3 || ks == 13 || ks == 14) {
949 TParticle* particle = 0;
951 particle = fStack->Particle(nt);
953 particle = gAlice->Stack()->Particle(nt);
955 particle->SetFirstDaughter(fPythia->GetK(2, i));
956 particle->SetLastDaughter(fPythia->GetK(3, i));
961 SetHighWaterMark(nt);
972 void AliGenPythia::FinishRun()
974 // Print x-section summary
983 printf("\nTotal number of Pyevnt() calls %d\n", fTrialsRun);
984 printf("\nMean Q, x1, x2: %f %f %f\n", fQ, fX1, fX2);
987 void AliGenPythia::AdjustWeights() const
989 // Adjust the weights after generation of all events
993 Int_t ntrack=gAlice->GetMCApp()->GetNtrack();
994 for (Int_t i=0; i<ntrack; i++) {
995 part= gAlice->GetMCApp()->Particle(i);
996 part->SetWeight(part->GetWeight()*fKineBias);
1001 void AliGenPythia::SetNuclei(Int_t a1, Int_t a2)
1003 // Treat protons as inside nuclei with mass numbers a1 and a2
1011 void AliGenPythia::MakeHeader()
1014 // Make header for the simulated event
1017 if (gAlice->GetEvNumber()>=fDebugEventFirst &&
1018 gAlice->GetEvNumber()<=fDebugEventLast) fPythia->Pylist(2);
1021 // Builds the event header, to be called after each event
1022 if (fHeader) delete fHeader;
1023 fHeader = new AliGenPythiaEventHeader("Pythia");
1026 ((AliGenPythiaEventHeader*) fHeader)->SetProcessType(fPythia->GetMSTI(1));
1029 ((AliGenPythiaEventHeader*) fHeader)->SetTrials(fTrials);
1032 fHeader->SetPrimaryVertex(fVertex);
1034 // Jets that have triggered
1036 if (fProcess == kPyJets)
1039 Float_t jets[4][10];
1040 GetJets(njet, ntrig, jets);
1043 for (Int_t i = 0; i < ntrig; i++) {
1044 ((AliGenPythiaEventHeader*) fHeader)->AddJet(jets[0][i], jets[1][i], jets[2][i],
1049 // Copy relevant information from external header, if present.
1054 AliGenPythiaEventHeader* exHeader = (AliGenPythiaEventHeader*) (fRL->GetHeader()->GenEventHeader());
1055 for (Int_t i = 0; i < exHeader->NTriggerJets(); i++)
1057 printf("Adding Jet %d %d \n", i, exHeader->NTriggerJets());
1060 exHeader->TriggerJet(i, uqJet);
1061 ((AliGenPythiaEventHeader*) fHeader)->AddUQJet(uqJet[0], uqJet[1], uqJet[2], uqJet[3]);
1065 // Store quenching parameters
1072 fPythia->GetQuenchingParameters(xp, yp, z);
1075 Double_t r1 = PARIMP.rb1;
1076 Double_t r2 = PARIMP.rb2;
1077 Double_t b = PARIMP.b1;
1078 Double_t r = 0.5 * TMath::Sqrt(2. * (r1 * r1 + r2 * r2) - b * b);
1079 Double_t phi = PARIMP.psib1;
1080 xp = r * TMath::Cos(phi);
1081 yp = r * TMath::Sin(phi);
1084 ((AliGenPythiaEventHeader*) fHeader)->SetXYJet(xp, yp);
1085 ((AliGenPythiaEventHeader*) fHeader)->SetZQuench(z);
1089 ((AliGenPythiaEventHeader*) fHeader)->SetPtHard(fPythia->GetVINT(47));
1096 void AliGenPythia::AddHeader(AliGenEventHeader* header)
1098 // Add header to container or runloader
1100 fContainer->AddHeader(header);
1102 AliRunLoader::GetRunLoader()->GetHeader()->SetGenEventHeader(header);
1107 Bool_t AliGenPythia::CheckTrigger(TParticle* jet1, TParticle* jet2)
1109 // Check the kinematic trigger condition
1112 eta[0] = jet1->Eta();
1113 eta[1] = jet2->Eta();
1115 phi[0] = jet1->Phi();
1116 phi[1] = jet2->Phi();
1118 pdg[0] = jet1->GetPdgCode();
1119 pdg[1] = jet2->GetPdgCode();
1120 Bool_t triggered = kFALSE;
1122 if (fProcess == kPyJets) {
1125 Float_t jets[4][10];
1127 // Use Pythia clustering on parton level to determine jet axis
1129 GetJets(njets, ntrig, jets);
1131 if (ntrig || fEtMinJet == 0.) triggered = kTRUE;
1136 if (pdg[0] == kGamma) {
1140 //Check eta range first...
1141 if ((eta[ij] < fEtaMaxJet && eta[ij] > fEtaMinJet) &&
1142 (eta[ig] < fEtaMaxGamma && eta[ig] > fEtaMinGamma))
1144 //Eta is okay, now check phi range
1145 if ((phi[ij] < fPhiMaxJet && phi[ij] > fPhiMinJet) &&
1146 (phi[ig] < fPhiMaxGamma && phi[ig] > fPhiMinGamma))
1157 Bool_t AliGenPythia::CheckKinematicsOnChild(){
1159 //Checking Kinematics on Child (status code 1, particle code ?, kin cuts
1161 Bool_t checking = kFALSE;
1162 Int_t j, kcode, ks, km;
1163 Int_t nPartAcc = 0; //number of particles in the acceptance range
1164 Int_t numberOfAcceptedParticles = 1;
1165 if (fNumberOfAcceptedParticles != 0) { numberOfAcceptedParticles = fNumberOfAcceptedParticles; }
1166 Int_t npart = fParticles->GetEntriesFast();
1168 for (j = 0; j<npart; j++) {
1169 TParticle * jparticle = (TParticle *) fParticles->At(j);
1170 kcode = TMath::Abs( CheckPDGCode(jparticle->GetPdgCode()) );
1171 ks = jparticle->GetStatusCode();
1172 km = jparticle->GetFirstMother();
1174 if( (ks == 1) && (kcode == fPdgCodeParticleforAcceptanceCut) && (KinematicSelection(jparticle,1)) ){
1177 if( numberOfAcceptedParticles <= nPartAcc){
1187 AliGenPythia& AliGenPythia::operator=(const AliGenPythia& rhs)
1189 // Assignment operator
1194 void AliGenPythia::LoadEvent(AliStack* stack, Int_t flag, Int_t reHadr)
1197 // Load event into Pythia Common Block
1200 Int_t npart = stack -> GetNprimary();
1204 (fPythia->GetPyjets())->N = npart;
1206 n0 = (fPythia->GetPyjets())->N;
1207 (fPythia->GetPyjets())->N = n0 + npart;
1211 for (Int_t part = 0; part < npart; part++) {
1212 TParticle *mPart = stack->Particle(part);
1214 Int_t kf = mPart->GetPdgCode();
1215 Int_t ks = mPart->GetStatusCode();
1216 Int_t idf = mPart->GetFirstDaughter();
1217 Int_t idl = mPart->GetLastDaughter();
1220 if (ks == 11 || ks == 12) {
1227 Float_t px = mPart->Px();
1228 Float_t py = mPart->Py();
1229 Float_t pz = mPart->Pz();
1230 Float_t e = mPart->Energy();
1231 Float_t m = mPart->GetCalcMass();
1234 (fPythia->GetPyjets())->P[0][part+n0] = px;
1235 (fPythia->GetPyjets())->P[1][part+n0] = py;
1236 (fPythia->GetPyjets())->P[2][part+n0] = pz;
1237 (fPythia->GetPyjets())->P[3][part+n0] = e;
1238 (fPythia->GetPyjets())->P[4][part+n0] = m;
1240 (fPythia->GetPyjets())->K[1][part+n0] = kf;
1241 (fPythia->GetPyjets())->K[0][part+n0] = ks;
1242 (fPythia->GetPyjets())->K[3][part+n0] = idf + 1;
1243 (fPythia->GetPyjets())->K[4][part+n0] = idl + 1;
1244 (fPythia->GetPyjets())->K[2][part+n0] = mPart->GetFirstMother() + 1;
1249 void AliGenPythia::RecJetsUA1(Int_t& njets, Float_t jets [4][50])
1252 // Calls the Pythia jet finding algorithm to find jets in the current event
1257 Int_t n = fPythia->GetN();
1261 fPythia->Pycell(njets);
1263 for (i = 0; i < njets; i++) {
1264 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
1265 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
1266 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
1267 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
1278 void AliGenPythia::GetJets(Int_t& nJets, Int_t& nJetsTrig, Float_t jets[4][10])
1281 // Calls the Pythia clustering algorithm to find jets in the current event
1283 Int_t n = fPythia->GetN();
1286 if (fJetReconstruction == kCluster) {
1288 // Configure cluster algorithm
1290 fPythia->SetPARU(43, 2.);
1291 fPythia->SetMSTU(41, 1);
1293 // Call cluster algorithm
1295 fPythia->Pyclus(nJets);
1297 // Loading jets from common block
1303 fPythia->Pycell(nJets);
1307 for (i = 0; i < nJets; i++) {
1308 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
1309 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
1310 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
1311 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
1312 Float_t pt = TMath::Sqrt(px * px + py * py);
1313 Float_t phi = TMath::Pi() + TMath::ATan2(-py, -px);
1314 Float_t theta = TMath::ATan2(pt,pz);
1315 Float_t et = e * TMath::Sin(theta);
1316 Float_t eta = -TMath::Log(TMath::Tan(theta / 2.));
1318 eta > fEtaMinJet && eta < fEtaMaxJet &&
1319 phi > fPhiMinJet && phi < fPhiMaxJet &&
1320 et > fEtMinJet && et < fEtMaxJet
1323 jets[0][nJetsTrig] = px;
1324 jets[1][nJetsTrig] = py;
1325 jets[2][nJetsTrig] = pz;
1326 jets[3][nJetsTrig] = e;
1328 // printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
1330 // printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
1335 void AliGenPythia::GetSubEventTime()
1337 // Calculates time of the next subevent
1340 TArrayF &array = *fEventsTime;
1341 fEventTime = array[fCurSubEvent++];
1343 // printf(" Event time: %d %f %p",fCurSubEvent,fEventTime,fEventsTime);
1348 void AliGenPythia::Streamer(TBuffer &R__b)
1350 // Stream an object of class AliGenPythia.
1352 if (R__b.IsReading()) {
1353 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
1354 AliGenerator::Streamer(R__b);
1355 R__b >> (Int_t&)fProcess;
1356 R__b >> (Int_t&)fStrucFunc;
1357 R__b >> (Int_t&)fForceDecay;
1361 fParentSelect.Streamer(R__b);
1362 fChildSelect.Streamer(R__b);
1364 // (AliPythia::Instance())->Streamer(R__b);
1367 // if (fDecayer) fDecayer->Streamer(R__b);
1369 R__b.WriteVersion(AliGenPythia::IsA());
1370 AliGenerator::Streamer(R__b);
1371 R__b << (Int_t)fProcess;
1372 R__b << (Int_t)fStrucFunc;
1373 R__b << (Int_t)fForceDecay;
1377 fParentSelect.Streamer(R__b);
1378 fChildSelect.Streamer(R__b);
1383 // fDecayer->Streamer(R__b);