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 <TClonesArray.h>
29 #include <TDatabasePDG.h>
30 #include <TParticle.h>
32 #include <TObjArray.h>
36 #include "AliDecayerPythia.h"
37 #include "AliGenPythia.h"
38 #include "AliFastGlauber.h"
39 #include "AliHeader.h"
40 #include "AliGenPythiaEventHeader.h"
41 #include "AliPythia.h"
42 #include "AliPythiaRndm.h"
45 #include "AliRunLoader.h"
47 #include "PyquenCommon.h"
49 ClassImp(AliGenPythia)
52 AliGenPythia::AliGenPythia():
87 fDecayer(new AliDecayerPythia()),
95 fPhiMaxJet(2.* TMath::Pi()),
96 fJetReconstruction(kCell),
100 fPhiMaxGamma(2. * TMath::Pi()),
104 fPycellThreshold(0.),
106 fPycellMinEtJet(10.),
107 fPycellMaxRadius(1.),
108 fStackFillOpt(kFlavorSelection),
110 fFragmentation(kTRUE),
117 fTriggerMultiplicity(0),
118 fTriggerMultiplicityEta(0),
119 fTriggerMultiplicityPtMin(0),
120 fCountMode(kCountAll),
124 fFragPhotonInCalo(kFALSE),
126 fPhotonInCalo(kFALSE),
130 fCheckPHOSeta(kFALSE),
131 fFragPhotonOrPi0MinPt(0),
142 // Default Constructor
145 if (!AliPythiaRndm::GetPythiaRandom())
146 AliPythiaRndm::SetPythiaRandom(GetRandom());
149 AliGenPythia::AliGenPythia(Int_t npart)
161 fInteractionRate(0.),
175 fHadronisation(kTRUE),
177 fReadFromFile(kFALSE),
184 fDecayer(new AliDecayerPythia()),
185 fDebugEventFirst(-1),
192 fPhiMaxJet(2.* TMath::Pi()),
193 fJetReconstruction(kCell),
197 fPhiMaxGamma(2. * TMath::Pi()),
201 fPycellThreshold(0.),
203 fPycellMinEtJet(10.),
204 fPycellMaxRadius(1.),
205 fStackFillOpt(kFlavorSelection),
207 fFragmentation(kTRUE),
214 fTriggerMultiplicity(0),
215 fTriggerMultiplicityEta(0),
216 fTriggerMultiplicityPtMin(0),
217 fCountMode(kCountAll),
221 fFragPhotonInCalo(kFALSE),
223 fPhotonInCalo(kFALSE),
227 fCheckPHOSeta(kFALSE),
228 fFragPhotonOrPi0MinPt(0),
238 // default charm production at 5. 5 TeV
240 // structure function GRVHO
244 fTitle= "Particle Generator using PYTHIA";
246 // Set random number generator
247 if (!AliPythiaRndm::GetPythiaRandom())
248 AliPythiaRndm::SetPythiaRandom(GetRandom());
252 AliGenPythia::~AliGenPythia()
255 if(fEventsTime) delete fEventsTime;
258 void AliGenPythia::SetInteractionRate(Float_t rate,Float_t timewindow)
260 // Generate pileup using user specified rate
261 fInteractionRate = rate;
262 fTimeWindow = timewindow;
266 void AliGenPythia::GeneratePileup()
268 // Generate sub events time for pileup
270 if(fInteractionRate == 0.) {
271 Warning("GeneratePileup","Zero interaction specified. Skipping pileup generation.\n");
275 Int_t npart = NumberParticles();
277 Warning("GeneratePileup","Negative number of particles. Skipping pileup generation.\n");
281 if(fEventsTime) delete fEventsTime;
282 fEventsTime = new TArrayF(npart);
283 TArrayF &array = *fEventsTime;
284 for(Int_t ipart = 0; ipart < npart; ipart++)
287 Float_t eventtime = 0.;
290 eventtime += (AliPythiaRndm::GetPythiaRandom())->Exp(1./fInteractionRate);
291 if(eventtime > fTimeWindow) break;
292 array.Set(array.GetSize()+1);
293 array[array.GetSize()-1] = eventtime;
299 eventtime -= (AliPythiaRndm::GetPythiaRandom())->Exp(1./fInteractionRate);
300 if(TMath::Abs(eventtime) > fTimeWindow) break;
301 array.Set(array.GetSize()+1);
302 array[array.GetSize()-1] = eventtime;
305 SetNumberParticles(fEventsTime->GetSize());
308 void AliGenPythia::SetPycellParameters(Float_t etamax, Int_t neta, Int_t nphi,
309 Float_t thresh, Float_t etseed, Float_t minet, Float_t r)
311 // Set pycell parameters
312 fPycellEtaMax = etamax;
315 fPycellThreshold = thresh;
316 fPycellEtSeed = etseed;
317 fPycellMinEtJet = minet;
318 fPycellMaxRadius = r;
323 void AliGenPythia::SetEventListRange(Int_t eventFirst, Int_t eventLast)
325 // Set a range of event numbers, for which a table
326 // of generated particle will be printed
327 fDebugEventFirst = eventFirst;
328 fDebugEventLast = eventLast;
329 if (fDebugEventLast==-1) fDebugEventLast=fDebugEventFirst;
332 void AliGenPythia::Init()
336 SetMC(AliPythia::Instance());
337 fPythia=(AliPythia*) fMCEvGen;
340 fParentWeight=1./Float_t(fNpart);
344 fPythia->SetCKIN(3,fPtHardMin);
345 fPythia->SetCKIN(4,fPtHardMax);
346 fPythia->SetCKIN(7,fYHardMin);
347 fPythia->SetCKIN(8,fYHardMax);
349 if (fAProjectile > 0 && fATarget > 0) fPythia->SetNuclei(fAProjectile, fATarget, fNucPdf);
351 if (fFragmentation) {
352 fPythia->SetMSTP(111,1);
354 fPythia->SetMSTP(111,0);
358 // initial state radiation
359 fPythia->SetMSTP(61,fGinit);
360 // final state radiation
361 fPythia->SetMSTP(71,fGfinal);
364 fPythia->SetMSTP(91,1);
365 fPythia->SetPARP(91,fPtKick);
366 fPythia->SetPARP(93, 4. * fPtKick);
368 fPythia->SetMSTP(91,0);
373 fRL = AliRunLoader::Open(fFileName, "Partons");
374 fRL->LoadKinematics();
380 fPythia->ProcInit(fProcess,fEnergyCMS,fStrucFunc, fItune);
381 // Forward Paramters to the AliPythia object
382 fDecayer->SetForceDecay(fForceDecay);
383 // Switch off Heavy Flavors on request
385 // Maximum number of quark flavours used in pdf
386 fPythia->SetMSTP(58, 3);
387 // Maximum number of flavors that can be used in showers
388 fPythia->SetMSTJ(45, 3);
389 // Switch off g->QQbar splitting in decay table
390 ((AliDecayerPythia*) fDecayer)->HeavyFlavourOff();
396 // Parent and Children Selection
399 case kPyOldUEQ2ordered:
400 case kPyOldUEQ2ordered2:
404 case kPyCharmUnforced:
405 case kPyCharmPbPbMNR:
408 case kPyCharmppMNRwmi:
409 fParentSelect[0] = 411;
410 fParentSelect[1] = 421;
411 fParentSelect[2] = 431;
412 fParentSelect[3] = 4122;
413 fParentSelect[4] = 4232;
414 fParentSelect[5] = 4132;
415 fParentSelect[6] = 4332;
421 fParentSelect[0] = 421;
424 case kPyDPlusPbPbMNR:
427 fParentSelect[0] = 411;
430 case kPyDPlusStrangePbPbMNR:
431 case kPyDPlusStrangepPbMNR:
432 case kPyDPlusStrangeppMNR:
433 fParentSelect[0] = 431;
438 case kPyBeautyPbPbMNR:
439 case kPyBeautypPbMNR:
441 case kPyBeautyppMNRwmi:
442 fParentSelect[0]= 511;
443 fParentSelect[1]= 521;
444 fParentSelect[2]= 531;
445 fParentSelect[3]= 5122;
446 fParentSelect[4]= 5132;
447 fParentSelect[5]= 5232;
448 fParentSelect[6]= 5332;
451 case kPyBeautyUnforced:
452 fParentSelect[0] = 511;
453 fParentSelect[1] = 521;
454 fParentSelect[2] = 531;
455 fParentSelect[3] = 5122;
456 fParentSelect[4] = 5132;
457 fParentSelect[5] = 5232;
458 fParentSelect[6] = 5332;
463 fParentSelect[0] = 443;
467 case kPyMbWithDirectPhoton:
480 // JetFinder for Trigger
482 // Configure detector (EMCAL like)
484 fPythia->SetPARU(51, fPycellEtaMax);
485 fPythia->SetMSTU(51, fPycellNEta);
486 fPythia->SetMSTU(52, fPycellNPhi);
488 // Configure Jet Finder
490 fPythia->SetPARU(58, fPycellThreshold);
491 fPythia->SetPARU(52, fPycellEtSeed);
492 fPythia->SetPARU(53, fPycellMinEtJet);
493 fPythia->SetPARU(54, fPycellMaxRadius);
494 fPythia->SetMSTU(54, 2);
496 // This counts the total number of calls to Pyevnt() per run.
511 Warning("Init","SetNuclei used. Use SetProjectile + SetTarget instead. fDyBoost has been reset to 0\n");
514 fPythia->SetPARJ(200, 0.0);
515 fPythia->SetPARJ(199, 0.0);
516 fPythia->SetPARJ(198, 0.0);
517 fPythia->SetPARJ(197, 0.0);
520 fPythia->InitQuenching(0., 0.1, 0.6e6, 0);
524 // Nestor's change of the splittings
525 fPythia->SetPARJ(200, 0.8);
526 fPythia->SetMSTJ(41, 1); // QCD radiation only
527 fPythia->SetMSTJ(42, 2); // angular ordering
528 fPythia->SetMSTJ(44, 2); // option to run alpha_s
529 fPythia->SetMSTJ(47, 0); // No correction back to hard scattering element
530 fPythia->SetMSTJ(50, 0); // No coherence in first branching
531 fPythia->SetPARJ(82, 1.); // Cut off for parton showers
532 } else if (fQuench == 4) {
533 // Armesto-Cunqueiro-Salgado change of the splittings.
534 AliFastGlauber* glauber = AliFastGlauber::Instance();
536 //read and store transverse almonds corresponding to differnt
538 glauber->SetCentralityClass(0.,0.1);
539 fPythia->SetPARJ(200, 1.);
540 fPythia->SetPARJ(198, fQhat);
541 fPythia->SetPARJ(199, fLength);
542 fPythia->SetMSTJ(42, 2); // angular ordering
543 fPythia->SetMSTJ(44, 2); // option to run alpha_s
544 fPythia->SetPARJ(82, 1.); // Cut off for parton showers
548 void AliGenPythia::Generate()
550 // Generate one event
551 if (!fPythia) fPythia=(AliPythia*) fMCEvGen;
552 fDecayer->ForceDecay();
554 Float_t polar[3] = {0,0,0};
555 Float_t origin[3] = {0,0,0};
557 // converts from mm/c to s
558 const Float_t kconv=0.001/2.999792458e8;
568 // Set collision vertex position
569 if (fVertexSmear == kPerEvent) Vertex();
578 // Switch hadronisation off
580 fPythia->SetMSTJ(1, 0);
584 // Quenching comes through medium-modified splitting functions.
585 AliFastGlauber::Instance()->GetRandomBHard(bimp);
586 fPythia->SetPARJ(197, bimp);
590 // Either produce new event or read partons from file
592 if (!fReadFromFile) {
598 fNpartons = fPythia->GetN();
600 printf("Loading Event %d\n",AliRunLoader::Instance()->GetEventNumber());
601 fRL->GetEvent(AliRunLoader::Instance()->GetEventNumber());
603 LoadEvent(fRL->Stack(), 0 , 1);
608 // Run quenching routine
612 } else if (fQuench == 2){
613 fPythia->Pyquen(208., 0, 0.);
614 } else if (fQuench == 3) {
615 // Quenching is via multiplicative correction of the splittings
619 // Switch hadronisation on
621 if (fHadronisation) {
622 fPythia->SetMSTJ(1, 1);
624 // .. and perform hadronisation
625 // printf("Calling hadronisation %d\n", fPythia->GetN());
629 fPythia->ImportParticles(&fParticles,"All");
637 Int_t np = fParticles.GetEntriesFast();
639 if (np == 0) continue;
643 Int_t* pParent = new Int_t[np];
644 Int_t* pSelected = new Int_t[np];
645 Int_t* trackIt = new Int_t[np];
646 for (i = 0; i < np; i++) {
652 Int_t nc = 0; // Total n. of selected particles
653 Int_t nParents = 0; // Selected parents
654 Int_t nTkbles = 0; // Trackable particles
655 if (fProcess != kPyMbDefault &&
657 fProcess != kPyMbWithDirectPhoton &&
658 fProcess != kPyJets &&
659 fProcess != kPyDirectGamma &&
660 fProcess != kPyMbNonDiffr &&
661 fProcess != kPyMbMSEL1 &&
664 fProcess != kPyCharmppMNRwmi &&
665 fProcess != kPyBeautyppMNRwmi &&
666 fProcess != kPyBeautyJets) {
668 for (i = 0; i < np; i++) {
669 TParticle* iparticle = (TParticle *) fParticles.At(i);
670 Int_t ks = iparticle->GetStatusCode();
671 kf = CheckPDGCode(iparticle->GetPdgCode());
672 // No initial state partons
673 if (ks==21) continue;
675 // Heavy Flavor Selection
682 if (kfl > 100000) kfl %= 100000;
683 if (kfl > 10000) kfl %= 10000;
685 if (kfl > 10) kfl/=100;
687 if (kfl > 10) kfl/=10;
688 Int_t ipa = iparticle->GetFirstMother()-1;
691 // Establish mother daughter relation between heavy quarks and mesons
693 if (kf >= fFlavorSelect && kf <= 6) {
694 Int_t idau = iparticle->GetFirstDaughter() - 1;
696 TParticle* daughter = (TParticle *) fParticles.At(idau);
697 Int_t pdgD = daughter->GetPdgCode();
698 if (pdgD == 91 || pdgD == 92) {
699 Int_t jmin = daughter->GetFirstDaughter() - 1;
700 Int_t jmax = daughter->GetLastDaughter() - 1;
701 for (Int_t jp = jmin; jp <= jmax; jp++)
702 ((TParticle *) fParticles.At(jp))->SetFirstMother(i+1);
703 } // is string or cluster
709 TParticle * mother = (TParticle *) fParticles.At(ipa);
710 kfMo = TMath::Abs(mother->GetPdgCode());
713 // What to keep in Stack?
714 Bool_t flavorOK = kFALSE;
715 Bool_t selectOK = kFALSE;
717 if (kfl >= fFlavorSelect) flavorOK = kTRUE;
719 if (kfl > fFlavorSelect) {
723 if (kfl == fFlavorSelect) flavorOK = kTRUE;
725 switch (fStackFillOpt) {
726 case kFlavorSelection:
729 case kParentSelection:
730 if (ParentSelected(kf) || kf <= 10) selectOK = kTRUE;
733 if (flavorOK && selectOK) {
735 // Heavy flavor hadron or quark
737 // Kinematic seletion on final state heavy flavor mesons
738 if (ParentSelected(kf) && !KinematicSelection(iparticle, 0))
743 if (ParentSelected(kf)) ++nParents; // Update parent count
744 // printf("\n particle (HF) %d %d %d", i, pSelected[i], kf);
746 // Kinematic seletion on decay products
747 if (fCutOnChild && ParentSelected(kfMo) && ChildSelected(kf)
748 && !KinematicSelection(iparticle, 1))
754 // Select if mother was selected and is not tracked
756 if (pSelected[ipa] &&
757 !trackIt[ipa] && // mother will be tracked ?
758 kfMo != 5 && // mother is b-quark, don't store fragments
759 kfMo != 4 && // mother is c-quark, don't store fragments
760 kf != 92) // don't store string
763 // Semi-stable or de-selected: diselect decay products:
766 if (pSelected[i] == -1 || fDecayer->GetLifetime(kf) > fMaxLifeTime)
768 Int_t ipF = iparticle->GetFirstDaughter();
769 Int_t ipL = iparticle->GetLastDaughter();
770 if (ipF > 0) for (j = ipF-1; j < ipL; j++) pSelected[j] = -1;
772 // printf("\n particle (decay) %d %d %d", i, pSelected[i], kf);
773 pSelected[i] = (pSelected[i] == -1) ? 0 : 1;
776 if (pSelected[i] == -1) pSelected[i] = 0;
777 if (!pSelected[i]) continue;
778 // Count quarks only if you did not include fragmentation
779 if (fFragmentation && kf <= 10) continue;
782 // Decision on tracking
785 // Track final state particle
786 if (ks == 1) trackIt[i] = 1;
787 // Track semi-stable particles
788 if ((ks == 1) || (fDecayer->GetLifetime(kf) > fMaxLifeTime)) trackIt[i] = 1;
789 // Track particles selected by process if undecayed.
790 if (fForceDecay == kNoDecay) {
791 if (ParentSelected(kf)) trackIt[i] = 1;
793 if (ParentSelected(kf)) trackIt[i] = 0;
795 if (trackIt[i] == 1) ++nTkbles; // Update trackable counter
799 } // particle selection loop
801 for (i = 0; i<np; i++) {
802 if (!pSelected[i]) continue;
803 TParticle * iparticle = (TParticle *) fParticles.At(i);
804 kf = CheckPDGCode(iparticle->GetPdgCode());
805 Int_t ks = iparticle->GetStatusCode();
806 p[0] = iparticle->Px();
807 p[1] = iparticle->Py();
808 p[2] = iparticle->Pz();
809 p[3] = iparticle->Energy();
811 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
812 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
813 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
815 Float_t tof = kconv*iparticle->T();
816 Int_t ipa = iparticle->GetFirstMother()-1;
817 Int_t iparent = (ipa > -1) ? pParent[ipa] : -1;
819 PushTrack(fTrackIt*trackIt[i], iparent, kf,
820 p[0], p[1], p[2], p[3],
821 origin[0], origin[1], origin[2], tof,
822 polar[0], polar[1], polar[2],
823 kPPrimary, nt, 1., ks);
840 switch (fCountMode) {
842 // printf(" Count all \n");
846 // printf(" Count parents \n");
849 case kCountTrackables:
850 // printf(" Count trackable \n");
854 if (jev >= fNpart || fNpart == -1) {
855 fKineBias=Float_t(fNpart)/Float_t(fTrials);
857 fQ += fPythia->GetVINT(51);
858 fX1 += fPythia->GetVINT(41);
859 fX2 += fPythia->GetVINT(42);
860 fTrialsRun += fTrials;
867 SetHighWaterMark(nt);
868 // adjust weight due to kinematic selection
871 fXsection=fPythia->GetPARI(1);
874 Int_t AliGenPythia::GenerateMB()
877 // Min Bias selection and other global selections
879 Int_t i, kf, nt, iparent;
882 Float_t polar[3] = {0,0,0};
883 Float_t origin[3] = {0,0,0};
884 // converts from mm/c to s
885 const Float_t kconv=0.001/2.999792458e8;
889 Int_t np = (fHadronisation) ? fParticles.GetEntriesFast() : fNpartons;
893 Int_t* pParent = new Int_t[np];
894 for (i=0; i< np; i++) pParent[i] = -1;
895 if (fProcess == kPyJets || fProcess == kPyDirectGamma || fProcess == kPyBeautyJets || fProcess == kPyBeautyppMNRwmi) {
896 TParticle* jet1 = (TParticle *) fParticles.At(6);
897 TParticle* jet2 = (TParticle *) fParticles.At(7);
898 if (!CheckTrigger(jet1, jet2)) {
904 // Select jets with fragmentation photon or pi0 going to PHOS or EMCAL
905 if (fProcess == kPyJets && (fFragPhotonInCalo || fPi0InCalo) ) {
910 if (fFragPhotonInCalo) pdg = 22 ; // Photon
911 else if (fPi0InCalo) pdg = 111 ; // Pi0
913 for (i=0; i< np; i++) {
914 TParticle* iparticle = (TParticle *) fParticles.At(i);
915 if(iparticle->GetStatusCode()==1 && iparticle->GetPdgCode()==pdg &&
916 iparticle->Pt() > fFragPhotonOrPi0MinPt){
917 Int_t imother = iparticle->GetFirstMother() - 1;
918 TParticle* pmother = (TParticle *) fParticles.At(imother);
920 (pdg == 22 && pmother->GetStatusCode() != 11)) //No photon from hadron decay
922 Float_t phi = iparticle->Phi()*180./TMath::Pi(); //Convert to degrees
923 Float_t eta =TMath::Abs(iparticle->Eta()); //in calos etamin=-etamax
924 if((fCheckEMCAL && IsInEMCAL(phi,eta)) ||
925 (fCheckPHOS && IsInPHOS(phi,eta)) )
934 // Select beauty jets with electron in EMCAL
935 if (fProcess == kPyBeautyJets && fEleInEMCAL) {
939 Int_t pdg = 11; //electron
944 for (i=0; i< np; i++) {
945 TParticle* iparticle = (TParticle *) fParticles.At(i);
946 if(iparticle->GetStatusCode()==1 && TMath::Abs(iparticle->GetPdgCode())==pdg &&
947 iparticle->Pt() > fElectronMinPt){
948 pt = iparticle->Pt();
949 phi = iparticle->Phi()*180./TMath::Pi(); //Convert to degrees
950 eta =TMath::Abs(iparticle->Eta()); //in calos etamin=-etamax
951 if(IsInEMCAL(phi,eta))
957 AliDebug(5,Form("Found an electron jet (pt,eta,phi) = (%f,%f,%f)",pt,eta,phi));
960 // Check for minimum multiplicity
961 if (fTriggerMultiplicity > 0) {
962 Int_t multiplicity = 0;
963 for (i = 0; i < np; i++) {
964 TParticle * iparticle = (TParticle *) fParticles.At(i);
966 Int_t statusCode = iparticle->GetStatusCode();
968 // Initial state particle
972 if (fTriggerMultiplicityEta > 0 && TMath::Abs(iparticle->Eta()) > fTriggerMultiplicityEta)
975 if (iparticle->Pt() < fTriggerMultiplicityPtMin)
978 TParticlePDG* pdgPart = iparticle->GetPDG();
979 if (pdgPart && pdgPart->Charge() == 0)
985 if (multiplicity < fTriggerMultiplicity) {
990 Printf("Triggered on event with multiplicity of %d >= %d", multiplicity, fTriggerMultiplicity);
993 // Select events with a photon pt > min pt going to PHOS eta acceptance or exactly PHOS eta phi
994 if ((fProcess == kPyJets || fProcess == kPyDirectGamma) && fPhotonInCalo && (fCheckPHOSeta || fCheckPHOS)){
1000 for (i=0; i< np; i++) {
1001 TParticle* iparticle = (TParticle *) fParticles.At(i);
1002 Float_t phi = iparticle->Phi()*180./TMath::Pi(); //Convert to degrees
1003 Float_t eta =TMath::Abs(iparticle->Eta());//in calos etamin=-etamax
1005 if(iparticle->GetStatusCode() == 1
1006 && iparticle->GetPdgCode() == pdg
1007 && iparticle->Pt() > fPhotonMinPt
1010 // first check if the photon is in PHOS phi
1011 if(IsInPHOS(phi,eta)){
1015 if(fCheckPHOSeta) iphcand = i; // candiate photon to rotate in phi
1020 if(!okd && iphcand != -1) // execute rotation in phi
1021 RotatePhi(iphcand,okd);
1027 if (fTriggerParticle) {
1028 Bool_t triggered = kFALSE;
1029 for (i = 0; i < np; i++) {
1030 TParticle * iparticle = (TParticle *) fParticles.At(i);
1031 kf = CheckPDGCode(iparticle->GetPdgCode());
1032 if (kf != fTriggerParticle) continue;
1033 if (iparticle->Pt() == 0.) continue;
1034 if (TMath::Abs(iparticle->Eta()) > fTriggerEta) continue;
1045 // Check if there is a ccbar or bbbar pair with at least one of the two
1046 // in fYMin < y < fYMax
1048 if (fProcess == kPyCharmppMNRwmi || fProcess == kPyBeautyppMNRwmi || fProcess == kPyBeautyJets) {
1049 TParticle *partCheck;
1051 Bool_t theQ=kFALSE,theQbar=kFALSE,inYcut=kFALSE;
1052 Bool_t theChild=kFALSE;
1054 Int_t pdg,mpdg,mpdgUpperFamily;
1055 for(i=0; i<np; i++) {
1056 partCheck = (TParticle*)fParticles.At(i);
1057 pdg = partCheck->GetPdgCode();
1058 if(TMath::Abs(pdg) == fFlavorSelect) { // quark
1059 if(pdg>0) { theQ=kTRUE; } else { theQbar=kTRUE; }
1060 y = 0.5*TMath::Log((partCheck->Energy()+partCheck->Pz()+1.e-13)/
1061 (partCheck->Energy()-partCheck->Pz()+1.e-13));
1062 if(y>fYMin && y<fYMax) inYcut=kTRUE;
1064 if(fCutOnChild && TMath::Abs(pdg) == fPdgCodeParticleforAcceptanceCut) {
1065 Int_t mi = partCheck->GetFirstMother() - 1;
1067 mother = (TParticle*)fParticles.At(mi);
1068 mpdg=TMath::Abs(mother->GetPdgCode());
1069 mpdgUpperFamily=(mpdg>1000 ? mpdg+1000 : mpdg+100); // keep e from c from b
1070 if ( ParentSelected(mpdg) ||
1071 (fFlavorSelect==5 && ParentSelected(mpdgUpperFamily))) {
1072 if (KinematicSelection(partCheck,1)) {
1078 if (!theQ || !theQbar || !inYcut) { // one of the c/b conditions not satisfied
1082 if (fCutOnChild && !theChild) { // one of the child conditions not satisfied
1089 //Introducing child cuts in case kPyW, kPyZ, kPyMb, and kPyMbNonDiff
1090 if ( (fProcess == kPyW ||
1092 fProcess == kPyMbDefault ||
1093 fProcess == kPyMb ||
1094 fProcess == kPyMbWithDirectPhoton ||
1095 fProcess == kPyMbNonDiffr)
1096 && (fCutOnChild == 1) ) {
1097 if ( !CheckKinematicsOnChild() ) {
1104 for (i = 0; i < np; i++) {
1106 TParticle * iparticle = (TParticle *) fParticles.At(i);
1107 kf = CheckPDGCode(iparticle->GetPdgCode());
1108 Int_t ks = iparticle->GetStatusCode();
1109 Int_t km = iparticle->GetFirstMother();
1110 if ((ks == 1 && kf!=0 && KinematicSelection(iparticle, 0)) ||
1112 ((fProcess == kPyJets || fProcess == kPyBeautyJets) && ks == 21 && km == 0 && i>1)) {
1114 if (ks == 1) trackIt = 1;
1115 Int_t ipa = iparticle->GetFirstMother()-1;
1117 iparent = (ipa > -1) ? pParent[ipa] : -1;
1120 // store track information
1121 p[0] = iparticle->Px();
1122 p[1] = iparticle->Py();
1123 p[2] = iparticle->Pz();
1124 p[3] = iparticle->Energy();
1127 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
1128 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
1129 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
1131 Float_t tof = fEventTime + kconv * iparticle->T();
1133 PushTrack(fTrackIt*trackIt, iparent, kf,
1134 p[0], p[1], p[2], p[3],
1135 origin[0], origin[1], origin[2], tof,
1136 polar[0], polar[1], polar[2],
1137 kPPrimary, nt, 1., ks);
1141 SetHighWaterMark(nt);
1143 } // select particle
1152 void AliGenPythia::FinishRun()
1154 // Print x-section summary
1163 printf("\nTotal number of Pyevnt() calls %d\n", fTrialsRun);
1164 printf("\nMean Q, x1, x2: %f %f %f\n", fQ, fX1, fX2);
1167 void AliGenPythia::AdjustWeights() const
1169 // Adjust the weights after generation of all events
1173 Int_t ntrack=gAlice->GetMCApp()->GetNtrack();
1174 for (Int_t i=0; i<ntrack; i++) {
1175 part= gAlice->GetMCApp()->Particle(i);
1176 part->SetWeight(part->GetWeight()*fKineBias);
1181 void AliGenPythia::SetNuclei(Int_t a1, Int_t a2, Int_t pdfset)
1183 // Treat protons as inside nuclei with mass numbers a1 and a2
1187 fNucPdf = pdfset; // 0 EKS98 1 EPS08
1192 void AliGenPythia::MakeHeader()
1195 // Make header for the simulated event
1198 if (gAlice->GetEvNumber()>=fDebugEventFirst &&
1199 gAlice->GetEvNumber()<=fDebugEventLast) fPythia->Pylist(2);
1202 // Builds the event header, to be called after each event
1203 if (fHeader) delete fHeader;
1204 fHeader = new AliGenPythiaEventHeader("Pythia");
1207 ((AliGenPythiaEventHeader*) fHeader)->SetProcessType(fPythia->GetMSTI(1));
1210 ((AliGenPythiaEventHeader*) fHeader)->SetTrials(fTrials);
1213 fHeader->SetPrimaryVertex(fVertex);
1216 // Number of primaries
1217 fHeader->SetNProduced(fNprimaries);
1219 // Jets that have triggered
1221 //Need to store jets for b-jet studies too!
1222 if (fProcess == kPyJets || fProcess == kPyDirectGamma || fProcess == kPyBeautyJets || fProcess == kPyBeautyppMNRwmi)
1225 Float_t jets[4][10];
1226 GetJets(njet, ntrig, jets);
1229 for (Int_t i = 0; i < ntrig; i++) {
1230 ((AliGenPythiaEventHeader*) fHeader)->AddJet(jets[0][i], jets[1][i], jets[2][i],
1235 // Copy relevant information from external header, if present.
1240 AliGenPythiaEventHeader* exHeader = (AliGenPythiaEventHeader*) (fRL->GetHeader()->GenEventHeader());
1241 for (Int_t i = 0; i < exHeader->NTriggerJets(); i++)
1243 printf("Adding Jet %d %d \n", i, exHeader->NTriggerJets());
1246 exHeader->TriggerJet(i, uqJet);
1247 ((AliGenPythiaEventHeader*) fHeader)->AddUQJet(uqJet[0], uqJet[1], uqJet[2], uqJet[3]);
1251 // Store quenching parameters
1258 fPythia->GetQuenchingParameters(xp, yp, z);
1259 } else if (fQuench == 2){
1261 Double_t r1 = PARIMP.rb1;
1262 Double_t r2 = PARIMP.rb2;
1263 Double_t b = PARIMP.b1;
1264 Double_t r = 0.5 * TMath::Sqrt(2. * (r1 * r1 + r2 * r2) - b * b);
1265 Double_t phi = PARIMP.psib1;
1266 xp = r * TMath::Cos(phi);
1267 yp = r * TMath::Sin(phi);
1269 } else if (fQuench == 4) {
1273 AliFastGlauber::Instance()->GetSavedXY(xy);
1274 AliFastGlauber::Instance()->GetSavedI0I1(i0i1);
1277 ((AliGenPythiaEventHeader*) fHeader)->SetImpactParameter(fImpact);
1280 ((AliGenPythiaEventHeader*) fHeader)->SetXYJet(xp, yp);
1281 ((AliGenPythiaEventHeader*) fHeader)->SetZQuench(z);
1285 ((AliGenPythiaEventHeader*) fHeader)->SetPtHard(fPythia->GetVINT(47));
1293 Bool_t AliGenPythia::CheckTrigger(TParticle* jet1, TParticle* jet2)
1295 // Check the kinematic trigger condition
1298 eta[0] = jet1->Eta();
1299 eta[1] = jet2->Eta();
1301 phi[0] = jet1->Phi();
1302 phi[1] = jet2->Phi();
1304 pdg[0] = jet1->GetPdgCode();
1305 pdg[1] = jet2->GetPdgCode();
1306 Bool_t triggered = kFALSE;
1308 if (fProcess == kPyJets || fProcess == kPyBeautyJets || fProcess == kPyBeautyppMNRwmi) {
1311 Float_t jets[4][10];
1313 // Use Pythia clustering on parton level to determine jet axis
1315 GetJets(njets, ntrig, jets);
1317 if (ntrig || fEtMinJet == 0.) triggered = kTRUE;
1322 if (pdg[0] == kGamma) {
1326 //Check eta range first...
1327 if ((eta[ij] < fEtaMaxJet && eta[ij] > fEtaMinJet) &&
1328 (eta[ig] < fEtaMaxGamma && eta[ig] > fEtaMinGamma))
1330 //Eta is okay, now check phi range
1331 if ((phi[ij] < fPhiMaxJet && phi[ij] > fPhiMinJet) &&
1332 (phi[ig] < fPhiMaxGamma && phi[ig] > fPhiMinGamma))
1343 Bool_t AliGenPythia::CheckKinematicsOnChild(){
1345 //Checking Kinematics on Child (status code 1, particle code ?, kin cuts
1347 Bool_t checking = kFALSE;
1348 Int_t j, kcode, ks, km;
1349 Int_t nPartAcc = 0; //number of particles in the acceptance range
1350 Int_t numberOfAcceptedParticles = 1;
1351 if (fNumberOfAcceptedParticles != 0) { numberOfAcceptedParticles = fNumberOfAcceptedParticles; }
1352 Int_t npart = fParticles.GetEntriesFast();
1354 for (j = 0; j<npart; j++) {
1355 TParticle * jparticle = (TParticle *) fParticles.At(j);
1356 kcode = TMath::Abs( CheckPDGCode(jparticle->GetPdgCode()) );
1357 ks = jparticle->GetStatusCode();
1358 km = jparticle->GetFirstMother();
1360 if( (ks == 1) && (kcode == fPdgCodeParticleforAcceptanceCut) && (KinematicSelection(jparticle,1)) ){
1363 if( numberOfAcceptedParticles <= nPartAcc){
1372 void AliGenPythia::LoadEvent(AliStack* stack, Int_t flag, Int_t reHadr)
1375 // Load event into Pythia Common Block
1378 Int_t npart = stack -> GetNprimary();
1382 (fPythia->GetPyjets())->N = npart;
1384 n0 = (fPythia->GetPyjets())->N;
1385 (fPythia->GetPyjets())->N = n0 + npart;
1389 for (Int_t part = 0; part < npart; part++) {
1390 TParticle *mPart = stack->Particle(part);
1392 Int_t kf = mPart->GetPdgCode();
1393 Int_t ks = mPart->GetStatusCode();
1394 Int_t idf = mPart->GetFirstDaughter();
1395 Int_t idl = mPart->GetLastDaughter();
1398 if (ks == 11 || ks == 12) {
1405 Float_t px = mPart->Px();
1406 Float_t py = mPart->Py();
1407 Float_t pz = mPart->Pz();
1408 Float_t e = mPart->Energy();
1409 Float_t m = mPart->GetCalcMass();
1412 (fPythia->GetPyjets())->P[0][part+n0] = px;
1413 (fPythia->GetPyjets())->P[1][part+n0] = py;
1414 (fPythia->GetPyjets())->P[2][part+n0] = pz;
1415 (fPythia->GetPyjets())->P[3][part+n0] = e;
1416 (fPythia->GetPyjets())->P[4][part+n0] = m;
1418 (fPythia->GetPyjets())->K[1][part+n0] = kf;
1419 (fPythia->GetPyjets())->K[0][part+n0] = ks;
1420 (fPythia->GetPyjets())->K[3][part+n0] = idf + 1;
1421 (fPythia->GetPyjets())->K[4][part+n0] = idl + 1;
1422 (fPythia->GetPyjets())->K[2][part+n0] = mPart->GetFirstMother() + 1;
1426 void AliGenPythia::LoadEvent(TObjArray* stack, Int_t flag, Int_t reHadr)
1429 // Load event into Pythia Common Block
1432 Int_t npart = stack -> GetEntries();
1436 (fPythia->GetPyjets())->N = npart;
1438 n0 = (fPythia->GetPyjets())->N;
1439 (fPythia->GetPyjets())->N = n0 + npart;
1443 for (Int_t part = 0; part < npart; part++) {
1444 TParticle *mPart = dynamic_cast<TParticle *>(stack->At(part));
1445 Int_t kf = mPart->GetPdgCode();
1446 Int_t ks = mPart->GetStatusCode();
1447 Int_t idf = mPart->GetFirstDaughter();
1448 Int_t idl = mPart->GetLastDaughter();
1451 if (ks == 11 || ks == 12) {
1458 Float_t px = mPart->Px();
1459 Float_t py = mPart->Py();
1460 Float_t pz = mPart->Pz();
1461 Float_t e = mPart->Energy();
1462 Float_t m = mPart->GetCalcMass();
1465 (fPythia->GetPyjets())->P[0][part+n0] = px;
1466 (fPythia->GetPyjets())->P[1][part+n0] = py;
1467 (fPythia->GetPyjets())->P[2][part+n0] = pz;
1468 (fPythia->GetPyjets())->P[3][part+n0] = e;
1469 (fPythia->GetPyjets())->P[4][part+n0] = m;
1471 (fPythia->GetPyjets())->K[1][part+n0] = kf;
1472 (fPythia->GetPyjets())->K[0][part+n0] = ks;
1473 (fPythia->GetPyjets())->K[3][part+n0] = idf + 1;
1474 (fPythia->GetPyjets())->K[4][part+n0] = idl + 1;
1475 (fPythia->GetPyjets())->K[2][part+n0] = mPart->GetFirstMother() + 1;
1480 void AliGenPythia::RecJetsUA1(Int_t& njets, Float_t jets [4][50])
1483 // Calls the Pythia jet finding algorithm to find jets in the current event
1488 Int_t n = fPythia->GetN();
1492 fPythia->Pycell(njets);
1494 for (i = 0; i < njets; i++) {
1495 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
1496 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
1497 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
1498 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
1509 void AliGenPythia::GetJets(Int_t& nJets, Int_t& nJetsTrig, Float_t jets[4][10])
1512 // Calls the Pythia clustering algorithm to find jets in the current event
1514 Int_t n = fPythia->GetN();
1517 if (fJetReconstruction == kCluster) {
1519 // Configure cluster algorithm
1521 fPythia->SetPARU(43, 2.);
1522 fPythia->SetMSTU(41, 1);
1524 // Call cluster algorithm
1526 fPythia->Pyclus(nJets);
1528 // Loading jets from common block
1534 fPythia->Pycell(nJets);
1538 for (i = 0; i < nJets; i++) {
1539 Float_t px = (fPythia->GetPyjets())->P[0][n+i];
1540 Float_t py = (fPythia->GetPyjets())->P[1][n+i];
1541 Float_t pz = (fPythia->GetPyjets())->P[2][n+i];
1542 Float_t e = (fPythia->GetPyjets())->P[3][n+i];
1543 Float_t pt = TMath::Sqrt(px * px + py * py);
1544 Float_t phi = TMath::Pi() + TMath::ATan2(-py, -px);
1545 Float_t theta = TMath::ATan2(pt,pz);
1546 Float_t et = e * TMath::Sin(theta);
1547 Float_t eta = -TMath::Log(TMath::Tan(theta / 2.));
1549 eta > fEtaMinJet && eta < fEtaMaxJet &&
1550 phi > fPhiMinJet && phi < fPhiMaxJet &&
1551 et > fEtMinJet && et < fEtMaxJet
1554 jets[0][nJetsTrig] = px;
1555 jets[1][nJetsTrig] = py;
1556 jets[2][nJetsTrig] = pz;
1557 jets[3][nJetsTrig] = e;
1559 // printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
1561 // printf("\n........-Jet #%d: %10.3f %10.3f %10.3f %10.3f \n", i, pt, et, eta, phi * kRaddeg);
1566 void AliGenPythia::GetSubEventTime()
1568 // Calculates time of the next subevent
1571 TArrayF &array = *fEventsTime;
1572 fEventTime = array[fCurSubEvent++];
1574 // printf(" Event time: %d %f %p",fCurSubEvent,fEventTime,fEventsTime);
1578 Bool_t AliGenPythia::IsInEMCAL(Float_t phi, Float_t eta)
1580 // Is particle in EMCAL acceptance?
1581 // phi in degrees, etamin=-etamax
1582 if(phi > fEMCALMinPhi && phi < fEMCALMaxPhi &&
1589 Bool_t AliGenPythia::IsInPHOS(Float_t phi, Float_t eta)
1591 // Is particle in PHOS acceptance?
1592 // Acceptance slightly larger considered.
1593 // phi in degrees, etamin=-etamax
1594 if(phi > fPHOSMinPhi && phi < fPHOSMaxPhi &&
1601 void AliGenPythia::RotatePhi(Int_t iphcand, Bool_t& okdd)
1603 //calculate the new position random between fPHOSMinPhi and fPHOSMaxPhi
1604 Double_t phiPHOSmin = TMath::Pi()*fPHOSMinPhi/180;
1605 Double_t phiPHOSmax = TMath::Pi()*fPHOSMaxPhi/180;
1606 Double_t phiPHOS = gRandom->Uniform(phiPHOSmin,phiPHOSmax);
1608 //calculate deltaphi
1609 TParticle* ph = (TParticle *) fParticles.At(iphcand);
1610 Double_t phphi = ph->Phi();
1611 Double_t deltaphi = phiPHOS - phphi;
1615 //loop for all particles and produce the phi rotation
1616 Int_t np = (fHadronisation) ? fParticles.GetEntriesFast() : fNpartons;
1617 Double_t oldphi, newphi;
1618 Double_t newVx, newVy, R, Vz, time;
1619 Double_t newPx, newPy, pt, Pz, e;
1620 for(Int_t i=0; i< np; i++) {
1621 TParticle* iparticle = (TParticle *) fParticles.At(i);
1622 oldphi = iparticle->Phi();
1623 newphi = oldphi + deltaphi;
1624 if(newphi < 0) newphi = 2*TMath::Pi() + newphi; // correct angle
1625 if(newphi > 2*TMath::Pi()) newphi = newphi - 2*TMath::Pi(); // correct angle
1628 newVx = R*TMath::Cos(newphi);
1629 newVy = R*TMath::Sin(newphi);
1630 Vz = iparticle->Vz(); // don't transform
1631 time = iparticle->T(); // don't transform
1633 pt = iparticle->Pt();
1634 newPx = pt*TMath::Cos(newphi);
1635 newPy = pt*TMath::Sin(newphi);
1636 Pz = iparticle->Pz(); // don't transform
1637 e = iparticle->Energy(); // don't transform
1640 iparticle->SetProductionVertex(newVx, newVy, Vz, time);
1641 iparticle->SetMomentum(newPx, newPy, Pz, e);
1643 } //end particle loop
1645 // now let's check that we put correctly the candidate photon in PHOS
1646 Float_t phi = ph->Phi()*180./TMath::Pi(); //Convert to degrees
1647 Float_t eta =TMath::Abs(ph->Eta());//in calos etamin=-etamax
1648 if(IsInPHOS(phi,eta))
1654 void AliGenPythia::Streamer(TBuffer &R__b)
1656 // Stream an object of class AliGenPythia.
1658 if (R__b.IsReading()) {
1659 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
1660 AliGenerator::Streamer(R__b);
1661 R__b >> (Int_t&)fProcess;
1662 R__b >> (Int_t&)fStrucFunc;
1663 R__b >> (Int_t&)fForceDecay;
1667 fParentSelect.Streamer(R__b);
1668 fChildSelect.Streamer(R__b);
1670 // (AliPythia::Instance())->Streamer(R__b);
1673 // if (fDecayer) fDecayer->Streamer(R__b);
1675 R__b.WriteVersion(AliGenPythia::IsA());
1676 AliGenerator::Streamer(R__b);
1677 R__b << (Int_t)fProcess;
1678 R__b << (Int_t)fStrucFunc;
1679 R__b << (Int_t)fForceDecay;
1683 fParentSelect.Streamer(R__b);
1684 fChildSelect.Streamer(R__b);
1689 // fDecayer->Streamer(R__b);