EPOS/AliGenEpos.cxx

   1 /*
   2  * AliGenEpos.cxx
   3  *
   4  *  ALICE event generator based on EPOS model from Klaus Werner
   5  *
   6  *  Created on: Feb 28, 2009
   7  *      Author: Piotr Ostrowski, postrow@if.pw.edu.pl
   8  */
   9
  10 #include "AliGenEpos.h"
  11 #include "TEpos.h"
  12 #include "TParticle.h"
  13 #include "TMath.h"
  14 #include "AliLog.h"
  15 #include "AliGenEventHeader.h"
  16 #include "AliGenEposEventHeader.h"
  17
  18 ClassImp(AliGenEpos)
  19
  20 AliGenEpos::AliGenEpos() : AliGenMC(),
  21                 fBmin(0),
  22                 fBmax(10000),
  23                 fPhiMin(0),
  24                 fPhiMax(TMath::TwoPi()),
  25                 fFilterModelOutput(kFALSE) {
  26         SetMC(new TEpos());
  27 }
  28
  29 AliGenEpos::AliGenEpos(Int_t npart) : AliGenMC(npart),
  30                 fBmin(0),
  31                 fBmax(10000),
  32                 fPhiMin(0),
  33                 fPhiMax(TMath::TwoPi()),
  34                 fFilterModelOutput(kFALSE) {
  35         SetMC(new TEpos());
  36 }
  37
  38 void AliGenEpos::Init() {
  39         AliGenMC::Init();
  40         TEpos *epos = GetTEpos();
  41         epos->SetLaproj(this->fZProjectile);
  42         epos->SetMaproj(this->fAProjectile);
  43         epos->SetLatarg(this->fZTarget);
  44         epos->SetMatarg(this->fATarget);
  45         epos->SetPhimin(this->fPhiMin);
  46         epos->SetPhimax(this->fPhiMax);
  47         epos->SetBminim(this->fBmin);
  48         epos->SetBmaxim(this->fBmax);
  49         epos->SetEcms(this->fEnergyCMS);
  50         epos->SetSplitting(kTRUE);
  51         GetTEpos()->Initialize();
  52 }
  53
  54 void AliGenEpos::Generate() {
  55           Float_t polar[3]   =   {0,0,0};
  56           Float_t origin0[3]  =   {0,0,0};
  57           Float_t origin[3]   =   {0,0,0};
  58           fNprimaries = 0;
  59           Int_t nt  = 0; //output parameter for PushTrack
  60
  61           Vertex();
  62           for (int j=0; j < 3; j++) origin0[j] = fVertex[j];
  63
  64           // Generate one event
  65
  66           GetTEpos()->GenerateEvent();
  67           AliWarning("Generated");
  68           GetTEpos()->ImportParticles(&fParticles);
  69
  70           Int_t np = fParticles.GetEntriesFast();
  71           AliWarning(Form("Imported %d particles", np));
  72
  73           Int_t *idsOnStack = NULL;
  74           idsOnStack = new Int_t[np];
  75           TParticle *iparticle;
  76
  77           for (int i = 0; i < np; i++) {
  78                   iparticle = (TParticle *) fParticles.At(i);
  79                   //Bool_t isNullEntry = iparticle->GetStatusCode() == 0;
  80                   //Bool_t isCommentOrUnknown = iparticle->GetStatusCode() > 2;
  81                   Bool_t hasDecayed = iparticle->GetStatusCode() >= 2;
  82                   Bool_t isFinalState = iparticle->GetStatusCode() == 1;
  83                   Int_t imo = iparticle->GetFirstMother();
  84                   Bool_t  hasMother = (imo >=0);
  85
  86
  87                   if (isFinalState) {
  88                           origin[0] = iparticle->Vx();
  89                           origin[1] = iparticle->Vy();
  90                           origin[2] = iparticle->Vz();
  91                           //doubled track with freeze out coordinates for femtoscopy
  92                           PushTrack(0,
  93                                           imo>=0?idsOnStack[imo]:-1,
  94                                           iparticle->GetPdgCode(),
  95                                 iparticle->Px(),iparticle->Py(),iparticle->Pz(),iparticle->Energy(),
  96                                 origin[0], origin[1], origin[2],
  97                                 iparticle->T(),
  98                                 polar[0],polar[1],polar[2],
  99                                 hasMother ? kPDecay:kPNoProcess,nt);
 100
 101                       idsOnStack[i] = nt;
 102                       fNprimaries++;
 103                       KeepTrack(nt);
 104
 105                       //real track with smeared vertex
 106                       origin[0] += origin0[0];
 107                       origin[1] += origin0[1];
 108                       origin[2] += origin0[2];
 109                           PushTrack(1,
 110                                           nt,   //doubled track as mother
 111                                           iparticle->GetPdgCode(),
 112                                 iparticle->Px(),iparticle->Py(),iparticle->Pz(),iparticle->Energy(),
 113                                 origin[0], origin[1], origin[2],
 114                                 iparticle->T(),
 115                                 polar[0],polar[1],polar[2],
 116                                 kPDecay,nt);
 117                       fNprimaries++;
 118                       KeepTrack(nt);
 119                   } else if(hasDecayed || !fFilterModelOutput) {
 120                           // don't track it and don't smear vertex
 121                           origin[0] = iparticle->Vx();
 122                           origin[1] = iparticle->Vy();
 123                           origin[2] = iparticle->Vz();
 124                           PushTrack(0,
 125                                           imo>=0?idsOnStack[imo]:-1,
 126                                           iparticle->GetPdgCode(),
 127                                 iparticle->Px(),iparticle->Py(),iparticle->Pz(),iparticle->Energy(),
 128                                 origin[0], origin[1], origin[2],
 129                                 iparticle->T(),
 130                                 polar[0],polar[1],polar[2],
 131                                 hasMother ? kPDecay:kPNoProcess,nt);
 132                       idsOnStack[i] = nt;
 133                       fNprimaries++;
 134                       KeepTrack(nt);
 135                   } else if(fFilterModelOutput) {
 136                           //filtered internal model objects
 137                           idsOnStack[i] = -1; // to erase mother field in its dauthers
 138                   }
 139           }
 140           SetHighWaterMark(fNprimaries);
 141           TArrayF eventVertex;
 142           eventVertex.Set(3);
 143           eventVertex[0] = origin0[0];
 144           eventVertex[1] = origin0[1];
 145           eventVertex[2] = origin0[2];
 146         // Builds the event header, to be called after each event
 147           AliGenEposEventHeader* header = new AliGenEposEventHeader("EPOS");
 148
 149           header->SetNProduced(fNprimaries);
 150           header->SetPrimaryVertex(eventVertex);
 151
 152           header->SetImpactParameter(GetTEpos()->GetBimevt());
 153           header->SetReactionPlaneAngle(GetTEpos()->GetPhievt());
 154
 155           header->SetHardScatters(0);
 156           header->SetParticipants(GetTEpos()->GetNpjevt(), GetTEpos()->GetNtgevt());
 157           header->SetCollisions(GetTEpos()->GetKolevt(), 0, 0, GetTEpos()->GetNpjevt());
 158           header->SetSpectators(GetTEpos()->GetJpnevt(), GetTEpos()->GetJppevt(), GetTEpos()->GetJtnevt(), GetTEpos()->GetJtpevt());
 159
 160         // Event Vertex
 161           header->SetPrimaryVertex(fVertex);
 162
 163           header->SetBimevt(GetTEpos()->GetBimevt());
 164           header->SetPhievt(GetTEpos()->GetPhievt());
 165           header->SetKolevt(GetTEpos()->GetKolevt());
 166           header->SetKoievt(GetTEpos()->GetKoievt());
 167           header->SetPmxevt(GetTEpos()->GetPmxevt());
 168           header->SetEgyevt(GetTEpos()->GetEgyevt());
 169           header->SetNpjevt(GetTEpos()->GetNpjevt());
 170           header->SetNtgevt(GetTEpos()->GetNtgevt());
 171           header->SetNpnevt(GetTEpos()->GetNpnevt());
 172           header->SetNppevt(GetTEpos()->GetNppevt());
 173           header->SetNtnevt(GetTEpos()->GetNtnevt());
 174           header->SetNtpevt(GetTEpos()->GetNtpevt());
 175           header->SetJpnevt(GetTEpos()->GetJpnevt());
 176           header->SetJppevt(GetTEpos()->GetJppevt());
 177           header->SetJtnevt(GetTEpos()->GetJtnevt());
 178           header->SetJtpevt(GetTEpos()->GetJtpevt());
 179           header->SetXbjevt(GetTEpos()->GetXbjevt());
 180           header->SetQsqevt(GetTEpos()->GetQsqevt());
 181           header->SetNglevt(GetTEpos()->GetNglevt());
 182           header->SetZppevt(GetTEpos()->GetZppevt());
 183           header->SetZptevt(GetTEpos()->GetZptevt());
 184     AddHeader(header);
 185     fCollisionGeometry = (AliGenEposEventHeader*)  header;
 186
 187     delete[] idsOnStack;
 188 }
 189
 190 AliGenEpos::~AliGenEpos() {
 191 }
 192