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 **************************************************************************/
16 /* $Id: AliGenEMCocktail.cxx 40702 2010-04-26 13:09:52Z morsch $ */
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)
28 #include <TObjArray.h>
29 #include <TParticle.h>
31 #include <TVirtualMC.h>
33 #include "AliGenCocktailEventHeader.h"
35 #include "AliGenCocktailEntry.h"
36 #include "AliGenEMCocktail.h"
37 #include "AliGenEMlib.h"
38 #include "AliGenBox.h"
39 #include "AliGenParam.h"
43 #include "AliDecayer.h"
44 #include "AliDecayerPythia.h"
46 #include "AliGenCorrHF.h"
48 ClassImp(AliGenEMCocktail)
50 //________________________________________________________________________
51 AliGenEMCocktail::AliGenEMCocktail()
55 fWeightingMode(kNonAnalog),
63 //_________________________________________________________________________
64 AliGenEMCocktail::~AliGenEMCocktail()
70 //_________________________________________________________________________
71 void AliGenEMCocktail::CreateCocktail()
73 // create and add sources to the cocktail
75 fDecayer->SetForceDecay(fDecayMode);
76 fDecayer->ForceDecay();
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));
88 // Create and add electron sources to the generator
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);
99 AliGenParam * geneta=0;
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);
107 AliGenParam * genrho=0;
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);
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);
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);
131 AliGenParam * genphi=0;
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);
140 //-------------------------------------------------------------------
141 void AliGenEMCocktail::AddSource2Generator(Char_t* nameSource,
142 AliGenParam* const genSource)
144 // add sources to the cocktail
145 Double_t phiMin = fPhiMin*180./TMath::Pi();
146 Double_t phiMax = fPhiMax*180./TMath::Pi();
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);
155 AddGenerator(genSource,nameSource,1.); // Adding Generator
158 //-------------------------------------------------------------------
159 void AliGenEMCocktail::Init()
162 TIter next(fEntries);
163 AliGenCocktailEntry *entry;
165 while((entry = (AliGenCocktailEntry*)next())) {
166 entry->Generator()->SetStack(fStack);
171 //_________________________________________________________________________
172 void AliGenEMCocktail::Generate()
175 TIter next(fEntries);
176 AliGenCocktailEntry *entry = 0;
177 AliGenCocktailEntry *preventry = 0;
178 AliGenerator* gen = 0;
180 if (fHeader) delete fHeader;
181 fHeader = new AliGenCocktailEventHeader("Electromagnetic Cocktail Header");
183 const TObjArray *partArray = gAlice->GetMCApp()->Particles();
185 // Generate the vertex position used by all generators
186 if(fVertexSmear == kPerEvent) Vertex();
189 AliRunLoader * runloader = AliRunLoader::Instance();
191 if (runloader->Stack())
192 runloader->Stack()->Clean();
194 // Loop over generators and generate events
196 while((entry = (AliGenCocktailEntry*)next())) {
197 gen = entry->Generator();
198 gen->SetVertex(fVertex.At(0), fVertex.At(1), fVertex.At(2));
202 if (igen == 1) entry->SetFirst(0);
203 else entry->SetFirst((partArray->GetEntriesFast())+1);
204 gen->SetNumberParticles(fNPart);
206 entry->SetLast(partArray->GetEntriesFast());
212 // Setting weights for proper absolute normalization
213 Int_t iPart, iMother;
215 Double_t weight = 0.;
217 Int_t maxPart = partArray->GetEntriesFast();
218 for(iPart=0; iPart<maxPart; iPart++){
219 TParticle *part = gAlice->GetMCApp()->Particle(iPart);
220 iMother = part->GetFirstMother();
221 TParticle *mother = 0;
223 mother = gAlice->GetMCApp()->Particle(iMother);
224 pdgMother = mother->GetPdgCode();
227 pdgMother = part->GetPdgCode();
230 dNdy = fYieldArray[kGenPizero];
233 dNdy = fYieldArray[kGenEta];
236 dNdy = fYieldArray[kGenRho];
239 dNdy = fYieldArray[kGenOmega];
242 dNdy = fYieldArray[kGenEtaprime];
245 dNdy = fYieldArray[kGenPhi];
252 weight = dNdy*part->GetWeight();
253 part->SetWeight(weight);
256 fHeader->SetNProduced(maxPart);
261 for (Int_t j=0; j < 3; j++) eventVertex[j] = fVertex[j];
263 fHeader->SetPrimaryVertex(eventVertex);
265 gAlice->SetGenEventHeader(fHeader);