7e4cfb6938a89290a30cabf4c671f9840b8c0a2d
[u/mrichter/AliRoot.git] / 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   // Sets up TEpos
40         AliGenMC::Init();
41         TEpos *epos = GetTEpos();
42         epos->SetLaproj(this->fZProjectile);
43         epos->SetMaproj(this->fAProjectile);
44         epos->SetLatarg(this->fZTarget);
45         epos->SetMatarg(this->fATarget);
46         epos->SetPhimin(this->fPhiMin);
47         epos->SetPhimax(this->fPhiMax);
48         epos->SetBminim(this->fBmin);
49         epos->SetBmaxim(this->fBmax);
50         epos->SetEcms(this->fEnergyCMS);
51         epos->SetSplitting(kTRUE);
52         GetTEpos()->Initialize();
53 }
54
55 void AliGenEpos::Generate() {
56   // Does actual generation and output conversion
57           Float_t polar[3]   =   {0,0,0};
58           Float_t origin0[3]  =   {0,0,0};
59           Float_t origin[3]   =   {0,0,0};
60           fNprimaries = 0;
61           Int_t nt  = 0; //output parameter for PushTrack
62
63           Vertex();
64           for (int j=0; j < 3; j++) origin0[j] = fVertex[j];
65
66           // Generate one event
67
68           GetTEpos()->GenerateEvent();
69           AliWarning("Generated");
70           GetTEpos()->ImportParticles(&fParticles);
71
72           Int_t np = fParticles.GetEntriesFast();
73           AliWarning(Form("Imported %d particles", np));
74
75           Int_t *idsOnStack = NULL;
76           idsOnStack = new Int_t[np];
77           TParticle *iparticle;
78
79           for (int i = 0; i < np; i++) {
80                   iparticle = (TParticle *) fParticles.At(i);
81                   //Bool_t isNullEntry = iparticle->GetStatusCode() == 0;
82                   //Bool_t isCommentOrUnknown = iparticle->GetStatusCode() > 2;
83                   Bool_t hasDecayed = iparticle->GetStatusCode() >= 2;
84                   Bool_t isFinalState = iparticle->GetStatusCode() == 1;
85                   Int_t imo = iparticle->GetFirstMother();
86                   Bool_t  hasMother = (imo >=0);
87
88
89                   if (isFinalState) {
90                           origin[0] = iparticle->Vx();
91                           origin[1] = iparticle->Vy();
92                           origin[2] = iparticle->Vz();
93                           //doubled track with freeze out coordinates for femtoscopy
94                           PushTrack(0,
95                                           imo>=0?idsOnStack[imo]:-1,
96                                           iparticle->GetPdgCode(),
97                                 iparticle->Px(),iparticle->Py(),iparticle->Pz(),iparticle->Energy(),
98                                 origin[0], origin[1], origin[2],
99                                 iparticle->T(),
100                                 polar[0],polar[1],polar[2],
101                                 hasMother ? kPDecay:kPNoProcess,nt);
102
103                       idsOnStack[i] = nt;
104                       fNprimaries++;
105                       KeepTrack(nt);
106
107                       //real track with smeared vertex
108                       origin[0] += origin0[0];
109                       origin[1] += origin0[1];
110                       origin[2] += origin0[2];
111                           PushTrack(1,
112                                           nt,   //doubled track as mother
113                                           iparticle->GetPdgCode(),
114                                 iparticle->Px(),iparticle->Py(),iparticle->Pz(),iparticle->Energy(),
115                                 origin[0], origin[1], origin[2],
116                                 iparticle->T(),
117                                 polar[0],polar[1],polar[2],
118                                 kPDecay,nt);
119                       fNprimaries++;
120                       KeepTrack(nt);
121                   } else if(hasDecayed || !fFilterModelOutput) {
122                           // don't track it and don't smear vertex
123                           origin[0] = iparticle->Vx();
124                           origin[1] = iparticle->Vy();
125                           origin[2] = iparticle->Vz();
126                           PushTrack(0,
127                                           imo>=0?idsOnStack[imo]:-1,
128                                           iparticle->GetPdgCode(),
129                                 iparticle->Px(),iparticle->Py(),iparticle->Pz(),iparticle->Energy(),
130                                 origin[0], origin[1], origin[2],
131                                 iparticle->T(),
132                                 polar[0],polar[1],polar[2],
133                                 hasMother ? kPDecay:kPNoProcess,nt);
134                       idsOnStack[i] = nt;
135                       fNprimaries++;
136                       KeepTrack(nt);
137                   } else if(fFilterModelOutput) {
138                           //filtered internal model objects
139                           idsOnStack[i] = -1; // to erase mother field in its dauthers
140                   }
141           }
142           SetHighWaterMark(fNprimaries);
143           TArrayF eventVertex;
144           eventVertex.Set(3);
145           eventVertex[0] = origin0[0];
146           eventVertex[1] = origin0[1];
147           eventVertex[2] = origin0[2];
148         // Builds the event header, to be called after each event
149           AliGenEposEventHeader* header = new AliGenEposEventHeader("EPOS");
150
151           header->SetNProduced(fNprimaries);
152           header->SetPrimaryVertex(eventVertex);
153
154           header->SetImpactParameter(GetTEpos()->GetBimevt());
155           header->SetReactionPlaneAngle(GetTEpos()->GetPhievt());
156
157           header->SetHardScatters(0);
158           header->SetParticipants(GetTEpos()->GetNpjevt(), GetTEpos()->GetNtgevt());
159           header->SetCollisions(GetTEpos()->GetKolevt(), 0, 0, GetTEpos()->GetNpjevt());
160           header->SetSpectators(GetTEpos()->GetJpnevt(), GetTEpos()->GetJppevt(), GetTEpos()->GetJtnevt(), GetTEpos()->GetJtpevt());
161
162         // Event Vertex
163           header->SetPrimaryVertex(fVertex);
164           
165           header->SetBimevt(GetTEpos()->GetBimevt());
166           header->SetPhievt(GetTEpos()->GetPhievt());
167           header->SetKolevt(GetTEpos()->GetKolevt());
168           header->SetKoievt(GetTEpos()->GetKoievt());
169           header->SetPmxevt(GetTEpos()->GetPmxevt());
170           header->SetEgyevt(GetTEpos()->GetEgyevt());
171           header->SetNpjevt(GetTEpos()->GetNpjevt());
172           header->SetNtgevt(GetTEpos()->GetNtgevt());
173           header->SetNpnevt(GetTEpos()->GetNpnevt());
174           header->SetNppevt(GetTEpos()->GetNppevt());
175           header->SetNtnevt(GetTEpos()->GetNtnevt());
176           header->SetNtpevt(GetTEpos()->GetNtpevt());
177           header->SetJpnevt(GetTEpos()->GetJpnevt());
178           header->SetJppevt(GetTEpos()->GetJppevt());
179           header->SetJtnevt(GetTEpos()->GetJtnevt());
180           header->SetJtpevt(GetTEpos()->GetJtpevt());
181           header->SetXbjevt(GetTEpos()->GetXbjevt());
182           header->SetQsqevt(GetTEpos()->GetQsqevt());
183           header->SetNglevt(GetTEpos()->GetNglevt());
184           header->SetZppevt(GetTEpos()->GetZppevt());
185           header->SetZptevt(GetTEpos()->GetZptevt());
186     AddHeader(header);
187     fCollisionGeometry = (AliGenEposEventHeader*)  header;
188     
189     delete[] idsOnStack;
190 }
191
192 AliGenEpos::~AliGenEpos() {
193 }
194