* EVGEN/AliGenEMCocktail.cxx (& .h) is the class that generates the cocktail follow...
[u/mrichter/AliRoot.git] / EVGEN / AliGenEMCocktail.cxx
CommitLineData
e40b9538 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
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 **************************************************************************/
15
16/* $Id: AliGenEMCocktail.cxx 40702 2010-04-26 13:09:52Z morsch $ */
17
18// Class to create cocktails for physics with electrons, di-electrons,
19// and photons from the decay of the following sources:
20// pizero, eta, rho, omega, etaprime, phi
21// Kinematic distributions of the sources are taken from AliGenEMlib.
22// Decay channels can be selected via the method SetDecayMode.
23// Particles can be generated flat in pT with weights according to the
24// chosen pT distributions from AliGenEMlib (weighting mode: kNonAnalog),
25// or they are generated according to the pT distributions themselves
26// (weighting mode: kAnalog)
27
28#include <TObjArray.h>
29#include <TParticle.h>
30#include <TF1.h>
31#include <TVirtualMC.h>
32#include <TPDGCode.h>
33#include "AliGenCocktailEventHeader.h"
34
35#include "AliGenCocktailEntry.h"
36#include "AliGenEMCocktail.h"
37#include "AliGenEMlib.h"
38#include "AliGenBox.h"
39#include "AliGenParam.h"
40#include "AliMC.h"
41#include "AliRun.h"
42#include "AliStack.h"
43#include "AliDecayer.h"
44#include "AliDecayerPythia.h"
45#include "AliLog.h"
46#include "AliGenCorrHF.h"
47
48ClassImp(AliGenEMCocktail)
49
50//________________________________________________________________________
51AliGenEMCocktail::AliGenEMCocktail()
52 :AliGenCocktail(),
53 fDecayer(0),
54 fDecayMode(kAll),
55 fWeightingMode(kNonAnalog),
56 fNPart(1000),
57 fYieldArray()
58{
59// Constructor
60
61}
62
63//_________________________________________________________________________
64AliGenEMCocktail::~AliGenEMCocktail()
65{
66// Destructor
67
68}
69
70//_________________________________________________________________________
71void AliGenEMCocktail::CreateCocktail()
72{
73// create and add sources to the cocktail
74
75 fDecayer->SetForceDecay(fDecayMode);
76 fDecayer->ForceDecay();
77
78// Set kinematic limits
79 Double_t ptMin = fPtMin;
80 Double_t ptMax = fPtMax;
81 Double_t yMin = fYMin;;
82 Double_t yMax = fYMax;;
83 Double_t phiMin = fPhiMin*180./TMath::Pi();
84 Double_t phiMax = fPhiMax*180./TMath::Pi();
85 AliInfo(Form("Ranges pT:%4.1f : %4.1f GeV/c, y:%4.2f : %4.2f, Phi:%5.1f : %5.1f degres",ptMin,ptMax,yMin,yMax,phiMin,phiMax));
86 AliInfo(Form("the parametrised sources uses the decay mode %d",fDecayMode));
87
88// Create and add electron sources to the generator
89
90// pizero
91 AliGenParam * genpizero=0;
92 Char_t namePizero[10];
93 sprintf(namePizero,"Pizero");
94 genpizero = new AliGenParam(fNPart, new AliGenEMlib(), AliGenEMlib::kPizero, "DUMMY");
95 AddSource2Generator(namePizero,genpizero);
96 TF1 *fPtPizero = genpizero->GetPt();
97 fYieldArray[kGenPizero] = fPtPizero->Integral(fPtMin,fPtMax,(Double_t *) 0x0,1.e-6);
98// eta
99 AliGenParam * geneta=0;
100 Char_t nameEta[10];
101 sprintf(nameEta,"Eta");
102 geneta = new AliGenParam(fNPart, new AliGenEMlib(), AliGenEMlib::kEta, "DUMMY");
103 AddSource2Generator(nameEta,geneta);
104 TF1 *fPtEta = geneta->GetPt();
105 fYieldArray[kGenEta] = fPtEta->Integral(fPtMin,fPtMax,(Double_t *) 0x0,1.e-6);
106// rho
107 AliGenParam * genrho=0;
108 Char_t nameRho[10];
109 sprintf(nameRho,"Rho");
110 genrho = new AliGenParam(fNPart, new AliGenEMlib(), AliGenEMlib::kRho, "DUMMY");
111 AddSource2Generator(nameRho,genrho);
112 TF1 *fPtRho = genrho->GetPt();
113 fYieldArray[kGenRho] = fPtRho->Integral(fPtMin,fPtMax,(Double_t *) 0x0,1.e-6);
114// omega
115 AliGenParam * genomega=0;
116 Char_t nameOmega[10];
117 sprintf(nameOmega,"Omega");
118 genomega = new AliGenParam(fNPart, new AliGenEMlib(), AliGenEMlib::kOmega, "DUMMY");
119 AddSource2Generator(nameOmega,genomega);
120 TF1 *fPtOmega = genomega->GetPt();
121 fYieldArray[kGenOmega] = fPtOmega->Integral(fPtMin,fPtMax,(Double_t *) 0x0,1.e-6);
122// etaprime
123 AliGenParam * genetaprime=0;
124 Char_t nameEtaprime[10];
125 sprintf(nameEtaprime,"Etaprime");
126 genetaprime = new AliGenParam(fNPart, new AliGenEMlib(), AliGenEMlib::kEtaprime, "DUMMY");
127 AddSource2Generator(nameEtaprime,genetaprime);
128 TF1 *fPtEtaprime = genetaprime->GetPt();
129 fYieldArray[kGenEtaprime] = fPtEtaprime->Integral(fPtMin,fPtMax,(Double_t *) 0x0,1.e-6);
130// phi
131 AliGenParam * genphi=0;
132 Char_t namePhi[10];
133 sprintf(namePhi,"Phi");
134 genphi = new AliGenParam(fNPart, new AliGenEMlib(), AliGenEMlib::kPhi, "DUMMY");
135 AddSource2Generator(namePhi,genphi);
136 TF1 *fPtPhi = genphi->GetPt();
137 fYieldArray[kGenPhi] = fPtPhi->Integral(fPtMin,fPtMax,(Double_t *) 0x0,1.e-6);
138}
139
140//-------------------------------------------------------------------
141void AliGenEMCocktail::AddSource2Generator(Char_t* nameSource,
142 AliGenParam* const genSource)
143{
144// add sources to the cocktail
145 Double_t phiMin = fPhiMin*180./TMath::Pi();
146 Double_t phiMax = fPhiMax*180./TMath::Pi();
147
148 genSource->SetPtRange(fPtMin, fPtMax);
149 genSource->SetYRange(fYMin, fYMax);
150 genSource->SetPhiRange(phiMin, phiMax);
151 genSource->SetWeighting(fWeightingMode);
152 if (!gMC) genSource->SetDecayer(fDecayer);
153 genSource->Init();
154
155 AddGenerator(genSource,nameSource,1.); // Adding Generator
156}
157
158//-------------------------------------------------------------------
159void AliGenEMCocktail::Init()
160{
161// Initialisation
162 TIter next(fEntries);
163 AliGenCocktailEntry *entry;
164 if (fStack) {
165 while((entry = (AliGenCocktailEntry*)next())) {
166 entry->Generator()->SetStack(fStack);
167 }
168 }
169}
170
171//_________________________________________________________________________
172void AliGenEMCocktail::Generate()
173{
174// Generate event
175 TIter next(fEntries);
176 AliGenCocktailEntry *entry = 0;
177 AliGenCocktailEntry *preventry = 0;
178 AliGenerator* gen = 0;
179
180 if (fHeader) delete fHeader;
181 fHeader = new AliGenCocktailEventHeader("Electromagnetic Cocktail Header");
182
183 const TObjArray *partArray = gAlice->GetMCApp()->Particles();
184
185// Generate the vertex position used by all generators
186 if(fVertexSmear == kPerEvent) Vertex();
187
188//Reseting stack
189 AliRunLoader * runloader = AliRunLoader::Instance();
190 if (runloader)
191 if (runloader->Stack())
192 runloader->Stack()->Clean();
193
194// Loop over generators and generate events
195 Int_t igen = 0;
196 const char* genName = 0;
197 while((entry = (AliGenCocktailEntry*)next())) {
198 gen = entry->Generator();
199 genName = entry->GetName();
200 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
201
202 if (fNPart > 0) {
203 igen++;
204 if (igen == 1) entry->SetFirst(0);
205 else entry->SetFirst((partArray->GetEntriesFast())+1);
206 gen->SetNumberParticles(fNPart);
207 gen->Generate();
208 entry->SetLast(partArray->GetEntriesFast());
209 preventry = entry;
210 }
211 }
212 next.Reset();
213
214// Setting weights for proper absolute normalization
215 Int_t iPart, iMother;
216 Int_t pdgMother = 0;
217 Double_t weight = 0.;
218 Double_t dNdy = 0.;
219 Int_t maxPart = partArray->GetEntriesFast();
220 for(iPart=0; iPart<maxPart; iPart++){
221 TParticle *part = gAlice->GetMCApp()->Particle(iPart);
222 iMother = part->GetFirstMother();
223 TParticle *mother = 0;
224 if (iMother>=0){
225 mother = gAlice->GetMCApp()->Particle(iMother);
226 pdgMother = mother->GetPdgCode();
227 }
228 else
229 pdgMother = part->GetPdgCode();
230 switch (pdgMother){
231 case 111:
232 dNdy = fYieldArray[kGenPizero];
233 break;
234 case 221:
235 dNdy = fYieldArray[kGenEta];
236 break;
237 case 113:
238 dNdy = fYieldArray[kGenRho];
239 break;
240 case 223:
241 dNdy = fYieldArray[kGenOmega];
242 break;
243 case 331:
244 dNdy = fYieldArray[kGenEtaprime];
245 break;
246 case 333:
247 dNdy = fYieldArray[kGenPhi];
248 break;
249
250 default:
251 dNdy = 0.;
252 }
253
254 weight = dNdy*part->GetWeight();
255 part->SetWeight(weight);
256 }
257
258 fHeader->SetNProduced(maxPart);
259
260
261 TArrayF eventVertex;
262 eventVertex.Set(3);
263 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
264
265 fHeader->SetPrimaryVertex(eventVertex);
266
267 gAlice->SetGenEventHeader(fHeader);
268}
269
270