4 * ALICE event generator based on EPOS model from Klaus Werner
6 * Created on: Feb 28, 2009
7 * Author: Piotr Ostrowski, postrow@if.pw.edu.pl
10 #include "AliGenEpos.h"
12 #include "TParticle.h"
15 #include "AliGenEventHeader.h"
16 #include "AliGenEposEventHeader.h"
20 AliGenEpos::AliGenEpos() : AliGenMC(),
24 fPhiMax(TMath::TwoPi()),
25 fFilterModelOutput(kFALSE) {
29 AliGenEpos::AliGenEpos(Int_t npart) : AliGenMC(npart),
33 fPhiMax(TMath::TwoPi()),
34 fFilterModelOutput(kFALSE) {
38 void AliGenEpos::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();
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};
59 Int_t nt = 0; //output parameter for PushTrack
62 for (int j=0; j < 3; j++) origin0[j] = fVertex[j];
66 GetTEpos()->GenerateEvent();
67 AliWarning("Generated");
68 GetTEpos()->ImportParticles(&fParticles);
70 Int_t np = fParticles.GetEntriesFast();
71 AliWarning(Form("Imported %d particles", np));
73 Int_t *idsOnStack = NULL;
74 idsOnStack = new Int_t[np];
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);
88 origin[0] = iparticle->Vx();
89 origin[1] = iparticle->Vy();
90 origin[2] = iparticle->Vz();
91 //doubled track with freeze out coordinates for femtoscopy
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],
98 polar[0],polar[1],polar[2],
99 hasMother ? kPDecay:kPNoProcess,nt);
105 //real track with smeared vertex
106 origin[0] += origin0[0];
107 origin[1] += origin0[1];
108 origin[2] += origin0[2];
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],
115 polar[0],polar[1],polar[2],
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();
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],
130 polar[0],polar[1],polar[2],
131 hasMother ? kPDecay:kPNoProcess,nt);
135 } else if(fFilterModelOutput) {
136 //filtered internal model objects
137 idsOnStack[i] = -1; // to erase mother field in its dauthers
140 SetHighWaterMark(fNprimaries);
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");
149 header->SetNProduced(fNprimaries);
150 header->SetPrimaryVertex(eventVertex);
152 header->SetImpactParameter(GetTEpos()->GetBimevt());
153 header->SetReactionPlaneAngle(GetTEpos()->GetPhievt());
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());
161 header->SetPrimaryVertex(fVertex);
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());
185 fCollisionGeometry = (AliGenEposEventHeader*) header;
190 AliGenEpos::~AliGenEpos() {