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>
35 #include "AliDecayerPythia.h"
36 #include "AliGenPythiaPlus.h"
37 #include "AliHeader.h"
38 #include "AliGenPythiaEventHeader.h"
39 #include "AliPythiaBase.h"
40 #include "AliPythiaRndm.h"
43 #include "AliRunLoader.h"
45 #include "PyquenCommon.h"
47 ClassImp(AliGenPythiaPlus)
50 AliGenPythiaPlus::AliGenPythiaPlus():
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),
114 fFragPhotonInCalo(kFALSE),
116 fPhotonInCalo(kFALSE),
119 fCheckPHOSeta(kFALSE),
120 fFragPhotonOrPi0MinPt(0),
130 // Default Constructor
133 if (!AliPythiaRndm::GetPythiaRandom())
134 AliPythiaRndm::SetPythiaRandom(GetRandom());
137 AliGenPythiaPlus::AliGenPythiaPlus(AliPythiaBase* pythia)
149 fInteractionRate(0.),
162 fHadronisation(kTRUE),
164 fReadFromFile(kFALSE),
168 fDecayer(new AliDecayerPythia()),
169 fDebugEventFirst(-1),
176 fPhiMaxJet(2.* TMath::Pi()),
177 fJetReconstruction(kCell),
181 fPhiMaxGamma(2. * TMath::Pi()),
185 fPycellThreshold(0.),
187 fPycellMinEtJet(10.),
188 fPycellMaxRadius(1.),
189 fStackFillOpt(kFlavorSelection),
191 fFragmentation(kTRUE),
197 fCountMode(kCountAll),
201 fFragPhotonInCalo(kFALSE),
203 fPhotonInCalo(kFALSE),
206 fCheckPHOSeta(kFALSE),
207 fFragPhotonOrPi0MinPt(0),
216 // default charm production at 5. 5 TeV
218 // structure function GRVHO
222 fTitle= "Particle Generator using PYTHIA";
224 // Set random number generator
225 if (!AliPythiaRndm::GetPythiaRandom())
226 AliPythiaRndm::SetPythiaRandom(GetRandom());
230 AliGenPythiaPlus::~AliGenPythiaPlus()
233 if(fEventsTime) delete fEventsTime;
236 void AliGenPythiaPlus::SetInteractionRate(Float_t rate,Float_t timewindow)
238 // Generate pileup using user specified rate
239 fInteractionRate = rate;
240 fTimeWindow = timewindow;
244 void AliGenPythiaPlus::GeneratePileup()
246 // Generate sub events time for pileup
248 if(fInteractionRate == 0.) {
249 Warning("GeneratePileup","Zero interaction specified. Skipping pileup generation.\n");
253 Int_t npart = NumberParticles();
255 Warning("GeneratePileup","Negative number of particles. Skipping pileup generation.\n");
259 if(fEventsTime) delete fEventsTime;
260 fEventsTime = new TArrayF(npart);
261 TArrayF &array = *fEventsTime;
262 for(Int_t ipart = 0; ipart < npart; ipart++)
265 Float_t eventtime = 0.;
268 eventtime += (AliPythiaRndm::GetPythiaRandom())->Exp(1./fInteractionRate);
269 if(eventtime > fTimeWindow) break;
270 array.Set(array.GetSize()+1);
271 array[array.GetSize()-1] = eventtime;
277 eventtime -= (AliPythiaRndm::GetPythiaRandom())->Exp(1./fInteractionRate);
278 if(TMath::Abs(eventtime) > fTimeWindow) break;
279 array.Set(array.GetSize()+1);
280 array[array.GetSize()-1] = eventtime;
283 SetNumberParticles(fEventsTime->GetSize());
286 void AliGenPythiaPlus::SetPycellParameters(Float_t etamax, Int_t neta, Int_t nphi,
287 Float_t thresh, Float_t etseed, Float_t minet, Float_t r)
289 // Set pycell parameters
290 fPycellEtaMax = etamax;
293 fPycellThreshold = thresh;
294 fPycellEtSeed = etseed;
295 fPycellMinEtJet = minet;
296 fPycellMaxRadius = r;
301 void AliGenPythiaPlus::SetEventListRange(Int_t eventFirst, Int_t eventLast)
303 // Set a range of event numbers, for which a table
304 // of generated particle will be printed
305 fDebugEventFirst = eventFirst;
306 fDebugEventLast = eventLast;
307 if (fDebugEventLast==-1) fDebugEventLast=fDebugEventFirst;
310 void AliGenPythiaPlus::Init()
314 // SetMC(AliPythia::Instance());
315 // fPythia=(AliPythia*) fMCEvGen;
318 fParentWeight=1./Float_t(fNpart);
322 fPythia->SetPtHardRange(fPtHardMin, fPtHardMax);
323 fPythia->SetYHardRange(fYHardMin, fYHardMax);
325 if (fAProjectile > 0 && fATarget > 0) fPythia->SetNuclei(fAProjectile, fATarget);
327 if (fFragmentation) {
328 fPythia->SetFragmentation(1);
330 fPythia->SetFragmentation(0);
334 // initial state radiation
335 fPythia->SetInitialAndFinalStateRadiation(fGinit, fGfinal);
338 fPythia->SetIntrinsicKt(fPtKick);
341 fRL = AliRunLoader::Open(fFileName, "Partons");
342 fRL->LoadKinematics();
348 fPythia->ProcInit(fProcess, fEnergyCMS, fStrucFunc);
349 // Forward Paramters to the AliPythia object
350 fDecayer->SetForceDecay(fForceDecay);
351 // Switch off Heavy Flavors on request
353 fPythia->SwitchHFOff();
354 // Switch off g->QQbar splitting in decay table
355 ((AliDecayerPythia*) fDecayer)->HeavyFlavourOff();
361 // Parent and Children Selection
364 case kPyOldUEQ2ordered:
365 case kPyOldUEQ2ordered2:
369 case kPyCharmUnforced:
370 case kPyCharmPbPbMNR:
373 case kPyCharmppMNRwmi:
374 fParentSelect[0] = 411;
375 fParentSelect[1] = 421;
376 fParentSelect[2] = 431;
377 fParentSelect[3] = 4122;
383 fParentSelect[0] = 421;
386 case kPyDPlusPbPbMNR:
389 fParentSelect[0] = 411;
392 case kPyDPlusStrangePbPbMNR:
393 case kPyDPlusStrangepPbMNR:
394 case kPyDPlusStrangeppMNR:
395 fParentSelect[0] = 431;
399 case kPyBeautyPbPbMNR:
400 case kPyBeautypPbMNR:
402 case kPyBeautyppMNRwmi:
403 fParentSelect[0]= 511;
404 fParentSelect[1]= 521;
405 fParentSelect[2]= 531;
406 fParentSelect[3]= 5122;
407 fParentSelect[4]= 5132;
408 fParentSelect[5]= 5232;
409 fParentSelect[6]= 5332;
412 case kPyBeautyUnforced:
413 fParentSelect[0] = 511;
414 fParentSelect[1] = 521;
415 fParentSelect[2] = 531;
416 fParentSelect[3] = 5122;
417 fParentSelect[4] = 5132;
418 fParentSelect[5] = 5232;
419 fParentSelect[6] = 5332;
424 fParentSelect[0] = 443;
440 // JetFinder for Trigger
442 // Configure detector (EMCAL like)
444 fPythia->SetPycellParameters(fPycellEtaMax,fPycellNEta, fPycellNPhi,
445 fPycellThreshold, fPycellEtSeed,
446 fPycellMinEtJet, fPycellMaxRadius);
448 // This counts the total number of calls to Pyevnt() per run.
463 Warning("Init","SetNuclei used. Use SetProjectile + SetTarget instead. fDyBoost has been reset to 0\n");
467 fPythia->InitQuenching(0., 0.1, 0.6e6, 0, 0.97, 30);
470 // fPythia->SetPARJ(200, 0.0);
472 // if (fQuench == 3) {
473 // // Nestor's change of the splittings
474 // fPythia->SetPARJ(200, 0.8);
475 // fPythia->SetMSTJ(41, 1); // QCD radiation only
476 // fPythia->SetMSTJ(42, 2); // angular ordering
477 // fPythia->SetMSTJ(44, 2); // option to run alpha_s
478 // fPythia->SetMSTJ(47, 0); // No correction back to hard scattering element
479 // fPythia->SetMSTJ(50, 0); // No coherence in first branching
480 // fPythia->SetPARJ(82, 1.); // Cut off for parton showers
484 void AliGenPythiaPlus::Generate()
486 // Generate one event
488 fDecayer->ForceDecay();
490 Float_t polar[3] = {0,0,0};
491 Float_t origin[3] = {0,0,0};
493 // converts from mm/c to s
494 const Float_t kconv=0.001/2.999792458e8;
504 // Set collision vertex position
505 if (fVertexSmear == kPerEvent) Vertex();
514 // Switch hadronisation off
516 // fPythia->SwitchHadronisationOff();
518 // Either produce new event or read partons from file
520 if (!fReadFromFile) {
522 fPythia->GenerateEvent();
524 fPythia->GenerateMIEvent();
526 fNpartons = fPythia->GetNumberOfParticles();
528 printf("Loading Event %d\n",AliRunLoader::GetRunLoader()->GetEventNumber());
529 fRL->GetEvent(AliRunLoader::GetRunLoader()->GetEventNumber());
530 fPythia->SetNumberOfParticles(0);
531 fPythia->LoadEvent(fRL->Stack(), 0 , 1);
532 fPythia->EditEventList(21);
536 // Run quenching routine
540 } else if (fQuench == 2){
541 fPythia->Pyquen(208., 0, 0.);
542 } else if (fQuench == 3) {
543 // Quenching is via multiplicative correction of the splittings
547 // Switch hadronisation on
549 // fPythia->SwitchHadronisationOn();
551 // .. and perform hadronisation
552 // printf("Calling hadronisation %d\n", fPythia->GetN());
553 // fPythia->HadronizeEvent();
555 fPythia->GetParticles(&fParticles);
563 Int_t np = fParticles.GetEntriesFast();
565 if (np == 0) continue;
569 Int_t* pParent = new Int_t[np];
570 Int_t* pSelected = new Int_t[np];
571 Int_t* trackIt = new Int_t[np];
572 for (i = 0; i < np; i++) {
578 Int_t nc = 0; // Total n. of selected particles
579 Int_t nParents = 0; // Selected parents
580 Int_t nTkbles = 0; // Trackable particles
581 if (fProcess != kPyMbDefault &&
583 fProcess != kPyJets &&
584 fProcess != kPyDirectGamma &&
585 fProcess != kPyMbNonDiffr &&
586 fProcess != kPyMbMSEL1 &&
589 fProcess != kPyCharmppMNRwmi &&
590 fProcess != kPyBeautyppMNRwmi) {
592 for (i = 0; i < np; i++) {
593 TParticle* iparticle = (TParticle *) fParticles.At(i);
594 Int_t ks = iparticle->GetStatusCode();
595 kf = CheckPDGCode(iparticle->GetPdgCode());
596 // No initial state partons
597 if (ks==21) continue;
599 // Heavy Flavor Selection
606 if (kfl > 100000) kfl %= 100000;
607 if (kfl > 10000) kfl %= 10000;
609 if (kfl > 10) kfl/=100;
611 if (kfl > 10) kfl/=10;
612 Int_t ipa = (fPythia->Version() == 6) ? (iparticle->GetFirstMother() - 1) :(iparticle->GetFirstMother()) ;
615 // Establish mother daughter relation between heavy quarks and mesons
617 if (kf >= fFlavorSelect && kf <= 6) {
618 Int_t idau = (fPythia->Version() == 6) ? (iparticle->GetFirstDaughter() - 1) :(iparticle->GetFirstDaughter());
620 TParticle* daughter = (TParticle *) fParticles.At(idau);
621 Int_t pdgD = daughter->GetPdgCode();
622 if (pdgD == 91 || pdgD == 92) {
623 Int_t jmin = (fPythia->Version() == 6) ? (daughter->GetFirstDaughter() - 1) : (daughter->GetFirstDaughter());
624 Int_t jmax = (fPythia->Version() == 6) ? (daughter->GetLastDaughter() - 1) : (daughter->GetLastDaughter());
626 for (Int_t jp = jmin; jp <= jmax; jp++)
627 ((TParticle *) fParticles.At(jp))->SetFirstMother(i+1);
628 } // is string or cluster
634 TParticle * mother = (TParticle *) fParticles.At(ipa);
635 kfMo = TMath::Abs(mother->GetPdgCode());
638 // What to keep in Stack?
639 Bool_t flavorOK = kFALSE;
640 Bool_t selectOK = kFALSE;
642 if (kfl >= fFlavorSelect) flavorOK = kTRUE;
644 if (kfl > fFlavorSelect) {
648 if (kfl == fFlavorSelect) flavorOK = kTRUE;
650 switch (fStackFillOpt) {
651 case kFlavorSelection:
654 case kParentSelection:
655 if (ParentSelected(kf) || kf <= 10) selectOK = kTRUE;
658 if (flavorOK && selectOK) {
660 // Heavy flavor hadron or quark
662 // Kinematic seletion on final state heavy flavor mesons
663 if (ParentSelected(kf) && !KinematicSelection(iparticle, 0))
668 if (ParentSelected(kf)) ++nParents; // Update parent count
669 // printf("\n particle (HF) %d %d %d", i, pSelected[i], kf);
671 // Kinematic seletion on decay products
672 if (fCutOnChild && ParentSelected(kfMo) && ChildSelected(kf)
673 && !KinematicSelection(iparticle, 1))
679 // Select if mother was selected and is not tracked
681 if (pSelected[ipa] &&
682 !trackIt[ipa] && // mother will be tracked ?
683 kfMo != 5 && // mother is b-quark, don't store fragments
684 kfMo != 4 && // mother is c-quark, don't store fragments
685 kf != 92) // don't store string
688 // Semi-stable or de-selected: diselect decay products:
691 if (pSelected[i] == -1 || fDecayer->GetLifetime(kf) > fMaxLifeTime)
693 Int_t ipF = iparticle->GetFirstDaughter();
694 Int_t ipL = iparticle->GetLastDaughter();
695 if (ipF > 0) for (j = ipF-1; j < ipL; j++) pSelected[j] = -1;
697 // printf("\n particle (decay) %d %d %d", i, pSelected[i], kf);
698 pSelected[i] = (pSelected[i] == -1) ? 0 : 1;
701 if (pSelected[i] == -1) pSelected[i] = 0;
702 if (!pSelected[i]) continue;
703 // Count quarks only if you did not include fragmentation
704 if (fFragmentation && kf <= 10) continue;
707 // Decision on tracking
710 // Track final state particle
711 if (ks == 1) trackIt[i] = 1;
712 // Track semi-stable particles
713 if ((ks == 1) || (fDecayer->GetLifetime(kf) > fMaxLifeTime)) trackIt[i] = 1;
714 // Track particles selected by process if undecayed.
715 if (fForceDecay == kNoDecay) {
716 if (ParentSelected(kf)) trackIt[i] = 1;
718 if (ParentSelected(kf)) trackIt[i] = 0;
720 if (trackIt[i] == 1) ++nTkbles; // Update trackable counter
724 } // particle selection loop
726 for (i = 0; i < np; i++) {
727 if (!pSelected[i]) continue;
728 TParticle * iparticle = (TParticle *) fParticles.At(i);
729 kf = CheckPDGCode(iparticle->GetPdgCode());
730 Int_t ks = iparticle->GetStatusCode();
731 p[0] = iparticle->Px();
732 p[1] = iparticle->Py();
733 p[2] = iparticle->Pz();
734 p[3] = iparticle->Energy();
736 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
737 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
738 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
740 Float_t tof = kconv*iparticle->T();
741 Int_t ipa = (fPythia->Version() == 6) ? (iparticle->GetFirstMother() - 1) :(iparticle->GetFirstMother()) ;
742 Int_t iparent = (ipa > -1) ? pParent[ipa] : -1;
744 PushTrack(fTrackIt*trackIt[i], iparent, kf,
745 p[0], p[1], p[2], p[3],
746 origin[0], origin[1], origin[2], tof,
747 polar[0], polar[1], polar[2],
748 kPPrimary, nt, 1., ks);
765 switch (fCountMode) {
767 // printf(" Count all \n");
771 // printf(" Count parents \n");
774 case kCountTrackables:
775 // printf(" Count trackable \n");
779 if (jev >= fNpart || fNpart == -1) {
780 fKineBias=Float_t(fNpart)/Float_t(fTrials);
781 fPythia->GetXandQ(fQ, fX1, fX2);
782 fTrialsRun += fTrials;
789 SetHighWaterMark(nt);
790 // Adjust weight due to kinematic selection
793 fXsection = fPythia->GetXSection();
796 Int_t AliGenPythiaPlus::GenerateMB()
799 // Min Bias selection and other global selections
801 Int_t i, kf, nt, iparent;
804 Float_t polar[3] = {0,0,0};
805 Float_t origin[3] = {0,0,0};
806 // converts from mm/c to s
807 const Float_t kconv = 0.001 / 2.999792458e8;
809 Int_t np = (fHadronisation) ? fParticles.GetEntriesFast() : fNpartons;
811 Int_t* pParent = new Int_t[np];
812 for (i=0; i< np; i++) pParent[i] = -1;
813 if (fProcess == kPyJets || fProcess == kPyDirectGamma) {
814 TParticle* jet1 = (TParticle *) fParticles.At(6);
815 TParticle* jet2 = (TParticle *) fParticles.At(7);
816 if (!CheckTrigger(jet1, jet2)) {
822 // Select jets with fragmentation photon or pi0 going to PHOS or EMCAL
823 if (fProcess == kPyJets && (fFragPhotonInCalo || fPi0InCalo) ) {
828 if (fFragPhotonInCalo) pdg = 22 ; // Photon
829 else if (fPi0InCalo) pdg = 111 ; // Pi0
831 for (i=0; i< np; i++) {
832 TParticle* iparticle = (TParticle *) fParticles.At(i);
833 if(iparticle->GetStatusCode()==1 && iparticle->GetPdgCode()==pdg &&
834 iparticle->Pt() > fFragPhotonOrPi0MinPt){
835 Int_t imother = (fPythia->Version() == 6) ? (iparticle->GetFirstMother() - 1) :(iparticle->GetFirstMother()) ;
836 TParticle* pmother = (TParticle *) fParticles.At(imother);
838 (pdg == 22 && pmother->GetStatusCode() != 11))//No photon from hadron decay
840 Float_t phi = iparticle->Phi()*180./TMath::Pi(); //Convert to degrees
841 Float_t eta =TMath::Abs(iparticle->Eta());//in calos etamin=-etamax
842 if((fCheckEMCAL && IsInEMCAL(phi,eta)) ||
843 (fCheckPHOS && IsInPHOS(phi,eta)) )
853 // Select events with a photon pt > min pt going to PHOS eta acceptance or exactly PHOS eta phi
854 if ((fProcess == kPyJets || fProcess == kPyDirectGamma) && fPhotonInCalo && (fCheckPHOSeta || fCheckPHOS)){
860 for (i=0; i< np; i++) {
861 TParticle* iparticle = (TParticle *) fParticles.At(i);
862 Float_t phi = iparticle->Phi()*180./TMath::Pi(); //Convert to degrees
863 Float_t eta =TMath::Abs(iparticle->Eta());//in calos etamin=-etamax
865 if(iparticle->GetStatusCode() == 1
866 && iparticle->GetPdgCode() == pdg
867 && iparticle->Pt() > fPhotonMinPt
870 // first check if the photon is in PHOS phi
871 if(IsInPHOS(phi,eta)){
875 if(fCheckPHOSeta) iphcand = i; // candiate photon to rotate in phi
880 if(!okd && iphcand != -1) // execute rotation in phi
881 RotatePhi(iphcand,okd);
887 if (fTriggerParticle) {
888 Bool_t triggered = kFALSE;
889 for (i = 0; i < np; i++) {
890 TParticle * iparticle = (TParticle *) fParticles.At(i);
891 kf = CheckPDGCode(iparticle->GetPdgCode());
892 if (kf != fTriggerParticle) continue;
893 if (iparticle->Pt() == 0.) continue;
894 if (TMath::Abs(iparticle->Eta()) > fTriggerEta) continue;
905 // Check if there is a ccbar or bbbar pair with at least one of the two
906 // in fYMin < y < fYMax
907 if (fProcess == kPyCharmppMNRwmi || fProcess == kPyBeautyppMNRwmi) {
909 Bool_t theQ=kFALSE,theQbar=kFALSE,inYcut=kFALSE;
912 for(i=0; i<np; i++) {
913 hvq = (TParticle*)fParticles.At(i);
914 pdgQ = hvq->GetPdgCode();
915 if(TMath::Abs(pdgQ) != fFlavorSelect) continue;
916 if(pdgQ>0) { theQ=kTRUE; } else { theQbar=kTRUE; }
917 yQ = 0.5*TMath::Log((hvq->Energy()+hvq->Pz()+1.e-13)/
918 (hvq->Energy()-hvq->Pz()+1.e-13));
919 if(yQ>fYMin && yQ<fYMax) inYcut=kTRUE;
921 if (!theQ || !theQbar || !inYcut) {
927 //Introducing child cuts in case kPyW, kPyZ, kPyMb, and kPyMbNonDiff
928 if ( (fProcess == kPyW ||
930 fProcess == kPyMbDefault ||
932 fProcess == kPyMbNonDiffr)
933 && (fCutOnChild == 1) ) {
934 if ( !CheckKinematicsOnChild() ) {
941 for (i = 0; i < np; i++) {
943 TParticle * iparticle = (TParticle *) fParticles.At(i);
944 kf = CheckPDGCode(iparticle->GetPdgCode());
945 Int_t ks = iparticle->GetStatusCode();
946 Int_t km = iparticle->GetFirstMother();
947 if ((ks == 1 && kf!=0 && KinematicSelection(iparticle, 0)) ||
949 (fProcess == kPyJets && ks == 21 && km == 0 && i>1)) {
951 if (ks == 1) trackIt = 1;
953 Int_t ipa = (fPythia->Version() == 6) ? (iparticle->GetFirstMother() - 1) :(iparticle->GetFirstMother()) ;
954 iparent = (ipa > -1) ? pParent[ipa] : -1;
955 if (ipa >= np) fPythia->EventListing();
958 // store track information
959 p[0] = iparticle->Px();
960 p[1] = iparticle->Py();
961 p[2] = iparticle->Pz();
962 p[3] = iparticle->Energy();
965 origin[0] = fVertex[0]+iparticle->Vx()/10; // [cm]
966 origin[1] = fVertex[1]+iparticle->Vy()/10; // [cm]
967 origin[2] = fVertex[2]+iparticle->Vz()/10; // [cm]
969 Float_t tof = fEventTime + kconv * iparticle->T();
971 PushTrack(fTrackIt*trackIt, iparent, kf,
972 p[0], p[1], p[2], p[3],
973 origin[0], origin[1], origin[2], tof,
974 polar[0], polar[1], polar[2],
975 kPPrimary, nt, 1., ks);
980 // Special Treatment to store color-flow
982 if (ks == 3 || ks == 13 || ks == 14) {
983 TParticle* particle = 0;
985 particle = fStack->Particle(nt);
987 particle = gAlice->Stack()->Particle(nt);
989 // particle->SetFirstDaughter(fPythia->GetK(2, i));
990 // particle->SetLastDaughter(fPythia->GetK(3, i));
995 SetHighWaterMark(nt);
1006 void AliGenPythiaPlus::FinishRun()
1008 // Print x-section summary
1009 fPythia->PrintStatistics();
1017 printf("\nTotal number of Pyevnt() calls %d\n", fTrialsRun);
1018 printf("\nMean Q, x1, x2: %f %f %f\n", fQ, fX1, fX2);
1021 void AliGenPythiaPlus::AdjustWeights() const
1023 // Adjust the weights after generation of all events
1027 Int_t ntrack=gAlice->GetMCApp()->GetNtrack();
1028 for (Int_t i=0; i<ntrack; i++) {
1029 part= gAlice->GetMCApp()->Particle(i);
1030 part->SetWeight(part->GetWeight()*fKineBias);
1035 void AliGenPythiaPlus::SetNuclei(Int_t a1, Int_t a2)
1037 // Treat protons as inside nuclei with mass numbers a1 and a2
1045 void AliGenPythiaPlus::MakeHeader()
1048 // Make header for the simulated event
1051 if (gAlice->GetEvNumber()>=fDebugEventFirst &&
1052 gAlice->GetEvNumber()<=fDebugEventLast) fPythia->EventListing();
1055 // Builds the event header, to be called after each event
1056 if (fHeader) delete fHeader;
1057 fHeader = new AliGenPythiaEventHeader("Pythia");
1060 ((AliGenPythiaEventHeader*) fHeader)->SetProcessType(fPythia->ProcessCode());
1063 ((AliGenPythiaEventHeader*) fHeader)->SetTrials(fTrials);
1066 fHeader->SetPrimaryVertex(fVertex);
1069 // Number of primaries
1070 fHeader->SetNProduced(fNprimaries);
1072 // Jets that have triggered
1074 if (fProcess == kPyJets)
1077 Float_t jets[4][10];
1078 GetJets(njet, ntrig, jets);
1081 for (Int_t i = 0; i < ntrig; i++) {
1082 ((AliGenPythiaEventHeader*) fHeader)->AddJet(jets[0][i], jets[1][i], jets[2][i],
1087 // Copy relevant information from external header, if present.
1092 AliGenPythiaEventHeader* exHeader = (AliGenPythiaEventHeader*) (fRL->GetHeader()->GenEventHeader());
1093 for (Int_t i = 0; i < exHeader->NTriggerJets(); i++)
1095 printf("Adding Jet %d %d \n", i, exHeader->NTriggerJets());
1098 exHeader->TriggerJet(i, uqJet);
1099 ((AliGenPythiaEventHeader*) fHeader)->AddUQJet(uqJet[0], uqJet[1], uqJet[2], uqJet[3]);
1103 // Store quenching parameters
1110 fPythia->GetQuenchingParameters(xp, yp, z);
1113 Double_t r1 = PARIMP.rb1;
1114 Double_t r2 = PARIMP.rb2;
1115 Double_t b = PARIMP.b1;
1116 Double_t r = 0.5 * TMath::Sqrt(2. * (r1 * r1 + r2 * r2) - b * b);
1117 Double_t phi = PARIMP.psib1;
1118 xp = r * TMath::Cos(phi);
1119 yp = r * TMath::Sin(phi);
1122 ((AliGenPythiaEventHeader*) fHeader)->SetXYJet(xp, yp);
1123 ((AliGenPythiaEventHeader*) fHeader)->SetZQuench(z);
1127 ((AliGenPythiaEventHeader*) fHeader)->SetPtHard(fPythia->GetPtHard());
1135 Bool_t AliGenPythiaPlus::CheckTrigger(TParticle* jet1, TParticle* jet2)
1137 // Check the kinematic trigger condition
1140 eta[0] = jet1->Eta();
1141 eta[1] = jet2->Eta();
1143 phi[0] = jet1->Phi();
1144 phi[1] = jet2->Phi();
1146 pdg[0] = jet1->GetPdgCode();
1147 pdg[1] = jet2->GetPdgCode();
1148 Bool_t triggered = kFALSE;
1150 if (fProcess == kPyJets) {
1153 Float_t jets[4][10];
1155 // Use Pythia clustering on parton level to determine jet axis
1157 GetJets(njets, ntrig, jets);
1159 if (ntrig || fEtMinJet == 0.) triggered = kTRUE;
1164 if (pdg[0] == kGamma) {
1168 //Check eta range first...
1169 if ((eta[ij] < fEtaMaxJet && eta[ij] > fEtaMinJet) &&
1170 (eta[ig] < fEtaMaxGamma && eta[ig] > fEtaMinGamma))
1172 //Eta is okay, now check phi range
1173 if ((phi[ij] < fPhiMaxJet && phi[ij] > fPhiMinJet) &&
1174 (phi[ig] < fPhiMaxGamma && phi[ig] > fPhiMinGamma))
1185 Bool_t AliGenPythiaPlus::CheckKinematicsOnChild(){
1187 //Checking Kinematics on Child (status code 1, particle code ?, kin cuts
1189 Bool_t checking = kFALSE;
1190 Int_t j, kcode, ks, km;
1191 Int_t nPartAcc = 0; //number of particles in the acceptance range
1192 Int_t numberOfAcceptedParticles = 1;
1193 if (fNumberOfAcceptedParticles != 0) { numberOfAcceptedParticles = fNumberOfAcceptedParticles; }
1194 Int_t npart = fParticles.GetEntriesFast();
1196 for (j = 0; j<npart; j++) {
1197 TParticle * jparticle = (TParticle *) fParticles.At(j);
1198 kcode = TMath::Abs( CheckPDGCode(jparticle->GetPdgCode()) );
1199 ks = jparticle->GetStatusCode();
1200 km = jparticle->GetFirstMother();
1202 if( (ks == 1) && (kcode == fPdgCodeParticleforAcceptanceCut) && (KinematicSelection(jparticle,1)) ){
1205 if( numberOfAcceptedParticles <= nPartAcc){
1214 void AliGenPythiaPlus::RecJetsUA1(Int_t& njets, Float_t jets [4][50])
1217 // Calls the Pythia jet finding algorithm to find jets in the current event
1224 fPythia->Pycell(njets);
1226 for (i = 0; i < njets; i++) {
1227 Float_t px, py, pz, e;
1228 fPythia->GetJet(i, px, py, pz, e);
1237 void AliGenPythiaPlus::GetJets(Int_t& nJets, Int_t& nJetsTrig, Float_t jets[4][10])
1240 // Calls the Pythia clustering algorithm to find jets in the current event
1244 if (fJetReconstruction == kCluster) {
1246 // Configure cluster algorithm
1248 // fPythia->SetPARU(43, 2.);
1249 // fPythia->SetMSTU(41, 1);
1251 // Call cluster algorithm
1253 fPythia->Pyclus(nJets);
1255 // Loading jets from common block
1261 fPythia->Pycell(nJets);
1265 for (i = 0; i < nJets; i++) {
1266 Float_t px, py, pz, e;
1267 fPythia->GetJet(i, px, py, pz, e);
1268 Float_t pt = TMath::Sqrt(px * px + py * py);
1269 Float_t phi = TMath::Pi() + TMath::ATan2(-py, -px);
1270 Float_t theta = TMath::ATan2(pt,pz);
1271 Float_t et = e * TMath::Sin(theta);
1272 Float_t eta = -TMath::Log(TMath::Tan(theta / 2.));
1274 eta > fEtaMinJet && eta < fEtaMaxJet &&
1275 phi > fPhiMinJet && phi < fPhiMaxJet &&
1276 et > fEtMinJet && et < fEtMaxJet
1279 jets[0][nJetsTrig] = px;
1280 jets[1][nJetsTrig] = py;
1281 jets[2][nJetsTrig] = pz;
1282 jets[3][nJetsTrig] = e;
1289 void AliGenPythiaPlus::GetSubEventTime()
1291 // Calculates time of the next subevent
1294 TArrayF &array = *fEventsTime;
1295 fEventTime = array[fCurSubEvent++];
1297 // printf(" Event time: %d %f %p",fCurSubEvent,fEventTime,fEventsTime);
1304 Bool_t AliGenPythiaPlus::IsInEMCAL(Float_t phi, Float_t eta)
1306 // Is particle in EMCAL acceptance?
1307 // phi in degrees, etamin=-etamax
1308 if(phi > fEMCALMinPhi && phi < fEMCALMaxPhi &&
1315 Bool_t AliGenPythiaPlus::IsInPHOS(Float_t phi, Float_t eta)
1317 // Is particle in PHOS acceptance?
1318 // Acceptance slightly larger considered.
1319 // phi in degrees, etamin=-etamax
1320 if(phi > fPHOSMinPhi && phi < fPHOSMaxPhi &&
1327 void AliGenPythiaPlus::RotatePhi(Int_t iphcand, Bool_t& okdd)
1329 //calculate the new position random between fPHOSMinPhi and fPHOSMaxPhi
1330 Double_t phiPHOSmin = TMath::Pi()*fPHOSMinPhi/180;
1331 Double_t phiPHOSmax = TMath::Pi()*fPHOSMaxPhi/180;
1332 Double_t phiPHOS = gRandom->Uniform(phiPHOSmin,phiPHOSmax);
1334 //calculate deltaphi
1335 TParticle* ph = (TParticle *) fParticles.At(iphcand);
1336 Double_t phphi = ph->Phi();
1337 Double_t deltaphi = phiPHOS - phphi;
1341 //loop for all particles and produce the phi rotation
1342 Int_t np = (fHadronisation) ? fParticles.GetEntriesFast() : fNpartons;
1343 Double_t oldphi, newphi;
1344 Double_t newVx, newVy, R, Vz, time;
1345 Double_t newPx, newPy, pt, Pz, e;
1346 for(Int_t i=0; i< np; i++) {
1347 TParticle* iparticle = (TParticle *) fParticles.At(i);
1348 oldphi = iparticle->Phi();
1349 newphi = oldphi + deltaphi;
1350 if(newphi < 0) newphi = 2*TMath::Pi() + newphi; // correct angle
1351 if(newphi > 2*TMath::Pi()) newphi = newphi - 2*TMath::Pi(); // correct angle
1354 newVx = R*TMath::Cos(newphi);
1355 newVy = R*TMath::Sin(newphi);
1356 Vz = iparticle->Vz(); // don't transform
1357 time = iparticle->T(); // don't transform
1359 pt = iparticle->Pt();
1360 newPx = pt*TMath::Cos(newphi);
1361 newPy = pt*TMath::Sin(newphi);
1362 Pz = iparticle->Pz(); // don't transform
1363 e = iparticle->Energy(); // don't transform
1366 iparticle->SetProductionVertex(newVx, newVy, Vz, time);
1367 iparticle->SetMomentum(newPx, newPy, Pz, e);
1369 } //end particle loop
1371 // now let's check that we put correctly the candidate photon in PHOS
1372 Float_t phi = ph->Phi()*180./TMath::Pi(); //Convert to degrees
1373 Float_t eta =TMath::Abs(ph->Eta());//in calos etamin=-etamax
1374 if(IsInPHOS(phi,eta))
1380 void AliGenPythiaPlus::Streamer(TBuffer &R__b)
1382 // Stream an object of class AliGenPythia.
1384 if (R__b.IsReading()) {
1385 Version_t R__v = R__b.ReadVersion(); if (R__v) { }
1386 AliGenerator::Streamer(R__b);
1387 R__b >> (Int_t&)fProcess;
1388 R__b >> (Int_t&)fStrucFunc;
1389 R__b >> (Int_t&)fForceDecay;
1393 fParentSelect.Streamer(R__b);
1394 fChildSelect.Streamer(R__b);
1396 // (AliPythia::Instance())->Streamer(R__b);
1399 // if (fDecayer) fDecayer->Streamer(R__b);
1401 R__b.WriteVersion(AliGenPythiaPlus::IsA());
1402 AliGenerator::Streamer(R__b);
1403 R__b << (Int_t)fProcess;
1404 R__b << (Int_t)fStrucFunc;
1405 R__b << (Int_t)fForceDecay;
1409 fParentSelect.Streamer(R__b);
1410 fChildSelect.Streamer(R__b);
1415 // fDecayer->Streamer(R__b);