#include <TF1.h>
#include <TVirtualMC.h>
#include <TPDGCode.h>
+#include <TDatabasePDG.h>
#include "AliGenCocktailEventHeader.h"
#include "AliGenCocktailEntry.h"
fCentrality(0),
fV2Systematic(0),
fForceConv(kFALSE),
- fHeaviestParticle(kGENs)
+ fHeaviestParticle(kGenJpsi)
{
// Constructor
AliGenEMlib::SelectParams(fPtSelect,fCentrality,fV2Systematic);
// Create and add electron sources to the generator
-
// pizero
+ if(fHeaviestParticle<kGenPizero)return;
AliGenParam *genpizero=0;
Char_t namePizero[10];
snprintf(namePizero,10,"Pizero");
- genpizero = new AliGenParam(fNPart, new AliGenEMlib(), AliGenEMlib::kPizero, "DUMMY");
+ genpizero = new AliGenParam(fNPart/0.925, new AliGenEMlib(), AliGenEMlib::kPizero, "DUMMY");
+ genpizero->SetYRange(fYMin/0.925, fYMax/0.925);
AddSource2Generator(namePizero,genpizero);
TF1 *fPtPizero = genpizero->GetPt();
#if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0)
AliGenParam *geneta=0;
Char_t nameEta[10];
snprintf(nameEta,10,"Eta");
- geneta = new AliGenParam(fNPart, new AliGenEMlib(), AliGenEMlib::kEta, "DUMMY");
+ geneta = new AliGenParam(fNPart/0.825, new AliGenEMlib(), AliGenEMlib::kEta, "DUMMY");
+ geneta->SetYRange(fYMin/0.825, fYMax/0.825);
AddSource2Generator(nameEta,geneta);
TF1 *fPtEta = geneta->GetPt();
#if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0)
AliGenParam *genrho=0;
Char_t nameRho[10];
snprintf(nameRho,10,"Rho");
- genrho = new AliGenParam(fNPart, new AliGenEMlib(), AliGenEMlib::kRho, "DUMMY");
+ genrho = new AliGenParam(fNPart/0.775, new AliGenEMlib(), AliGenEMlib::kRho, "DUMMY");
+ genrho->SetYRange(fYMin/0.775, fYMax/0.775);
AddSource2Generator(nameRho,genrho);
TF1 *fPtRho = genrho->GetPt();
#if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0)
AliGenParam *genomega=0;
Char_t nameOmega[10];
snprintf(nameOmega,10,"Omega");
- genomega = new AliGenParam(fNPart, new AliGenEMlib(), AliGenEMlib::kOmega, "DUMMY");
+ genomega = new AliGenParam(fNPart/0.775, new AliGenEMlib(), AliGenEMlib::kOmega, "DUMMY");
+ genomega->SetYRange(fYMin/0.775, fYMax/0.775);
AddSource2Generator(nameOmega,genomega);
TF1 *fPtOmega = genomega->GetPt();
#if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0)
AliGenParam *genetaprime=0;
Char_t nameEtaprime[10];
snprintf(nameEtaprime,10,"Etaprime");
- genetaprime = new AliGenParam(fNPart, new AliGenEMlib(), AliGenEMlib::kEtaprime, "DUMMY");
+ genetaprime = new AliGenParam(fNPart/0.725, new AliGenEMlib(), AliGenEMlib::kEtaprime, "DUMMY");
+ genetaprime->SetYRange(fYMin/0.725, fYMax/0.725);
AddSource2Generator(nameEtaprime,genetaprime);
TF1 *fPtEtaprime = genetaprime->GetPt();
#if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0)
AliGenParam *genphi=0;
Char_t namePhi[10];
snprintf(namePhi,10,"Phi");
- genphi = new AliGenParam(fNPart, new AliGenEMlib(), AliGenEMlib::kPhi, "DUMMY");
+ genphi = new AliGenParam(fNPart/0.725, new AliGenEMlib(), AliGenEMlib::kPhi, "DUMMY");
+ genphi->SetYRange(fYMin/0.725, fYMax/0.725);
AddSource2Generator(namePhi,genphi);
TF1 *fPtPhi = genphi->GetPt();
#if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0)
AliGenParam *genjpsi=0;
Char_t nameJpsi[10];
snprintf(nameJpsi,10,"Jpsi");
- genjpsi = new AliGenParam(fNPart, new AliGenEMlib(), AliGenEMlib::kJpsi, "DUMMY");
+ genjpsi = new AliGenParam(fNPart/0.525, new AliGenEMlib(), AliGenEMlib::kJpsi, "DUMMY");
+ genjpsi->SetYRange(fYMin/0.525, fYMax/0.525);
AddSource2Generator(nameJpsi,genjpsi);
TF1 *fPtJpsi = genjpsi->GetPt();
#if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0)
fYieldArray[kGenJpsi] = fPtJpsi->Integral(fPtMin,fPtMax,(Double_t *)0,1.e-6);
#endif
+ // prompt gamma
+ if(fDecayMode==kGammaEM){
+ if(fHeaviestParticle<kGenPromptRealGamma)return;
+ TDatabasePDG::Instance()->AddParticle("PromptRealGamma","PromptRealGamma",0,true,0,0,"GaugeBoson",221000);
+ //gMC->DefineParticle(221000, "PromptGamma", kPTGamma, 0, 0, 0,"Gamma", 0.0, 0, 0, 0, 0, 0, 0, 0, 0, kFALSE);
+ AliGenParam *genPromptRealG=0;
+ Char_t namePromptRealG[10];
+ snprintf(namePromptRealG,10,"PromptRealGamma");
+ genPromptRealG = new AliGenParam(fNPart*0.5, new AliGenEMlib(), AliGenEMlib::kPromptRealGamma, "DUMMY");
+ genPromptRealG->SetYRange(fYMin, fYMax);
+ AddSource2Generator(namePromptRealG,genPromptRealG);
+ TF1 *fPtPromptRealG = genPromptRealG->GetPt();
+#if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0)
+ fYieldArray[kGenPromptRealGamma] = fPtPromptRealG->Integral(fPtMin,fPtMax,1.e-6);
+#else
+ fYieldArray[kGenPromptRealGamma] = fPtPromptRealG->Integral(fPtMin,fPtMax,(Double_t *)0,1.e-6);
+#endif
+
+ if(fHeaviestParticle<kGenThermRealGamma)return;
+ TDatabasePDG::Instance()->AddParticle("ThermRealGamma","ThermRealGamma",0,true,0,0,"GaugeBoson",222000);
+ //gMC->DefineParticle(221000, "ThermGamma", kPTGamma, 0, 0, 0,"Gamma", 0.0, 0, 0, 0, 0, 0, 0, 0, 0, kFALSE);
+ AliGenParam *genThermRealG=0;
+ Char_t nameThermRealG[10];
+ snprintf(nameThermRealG,10,"ThermRealGamma");
+ genThermRealG = new AliGenParam(fNPart*0.5, new AliGenEMlib(), AliGenEMlib::kThermRealGamma, "DUMMY");
+ genThermRealG->SetYRange(fYMin, fYMax);
+ AddSource2Generator(nameThermRealG,genThermRealG);
+ TF1 *fPtThermRealG = genThermRealG->GetPt();
+#if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0)
+ fYieldArray[kGenThermRealGamma] = fPtThermRealG->Integral(fPtMin,fPtMax,1.e-6);
+#else
+ fYieldArray[kGenThermRealGamma] = fPtThermRealG->Integral(fPtMin,fPtMax,(Double_t *)0,1.e-6);
+#endif
+
+ if(fHeaviestParticle<kGenPromptVirtGamma)return;
+ TDatabasePDG::Instance()->AddParticle("PromptVirtGamma","PromptVirtGamma",0,true,0,0,"GaugeBoson",223000);
+ AliGenParam *genPromptVirtG=0;
+ Char_t namePromptVirtG[10];
+ snprintf(namePromptVirtG,10,"PromptVirtGamma");
+ genPromptVirtG = new AliGenParam(fNPart*0.5, new AliGenEMlib(), AliGenEMlib::kPromptVirtGamma, "DUMMY");
+ genPromptVirtG->SetYRange(fYMin, fYMax);
+ AddSource2Generator(namePromptVirtG,genPromptVirtG);
+ TF1 *fPtPromptVirtG = genPromptVirtG->GetPt();
+#if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0)
+ fYieldArray[kGenPromptVirtGamma] = fPtPromptVirtG->Integral(fPtMin,fPtMax,1.e-6);
+#else
+ fYieldArray[kGenPromptVirtGamma] = fPtPromptVirtG->Integral(fPtMin,fPtMax,(Double_t *)0,1.e-6);
+#endif
+
+ if(fHeaviestParticle<kGenThermVirtGamma)return;
+ TDatabasePDG::Instance()->AddParticle("ThermVirtGamma","ThermVirtGamma",0,true,0,0,"GaugeBoson",224000);
+ AliGenParam *genThermVirtG=0;
+ Char_t nameThermVirtG[10];
+ snprintf(nameThermVirtG,10,"ThermVirtGamma");
+ genThermVirtG = new AliGenParam(fNPart*0.5, new AliGenEMlib(), AliGenEMlib::kThermVirtGamma, "DUMMY");
+ genThermVirtG->SetYRange(fYMin, fYMax);
+ AddSource2Generator(nameThermVirtG,genThermVirtG);
+ TF1 *fPtThermVirtG = genThermVirtG->GetPt();
+#if ROOT_VERSION_CODE >= ROOT_VERSION(5,99,0)
+ fYieldArray[kGenThermVirtGamma] = fPtThermVirtG->Integral(fPtMin,fPtMax,1.e-6);
+#else
+ fYieldArray[kGenThermVirtGamma] = fPtThermVirtG->Integral(fPtMin,fPtMax,(Double_t *)0,1.e-6);
+#endif
+ }
+
}
//-------------------------------------------------------------------
Double_t phiMax = fPhiMax*180./TMath::Pi();
genSource->SetPtRange(fPtMin, fPtMax);
- genSource->SetYRange(fYMin, fYMax);
genSource->SetPhiRange(phiMin, phiMax);
genSource->SetWeighting(fWeightingMode);
genSource->SetForceGammaConversion(fForceConv);
if (igen == 1) entry->SetFirst(0);
else entry->SetFirst((partArray->GetEntriesFast())+1);
gen->SetEventPlane(evPlane);
- gen->SetNumberParticles(fNPart);
gen->Generate();
entry->SetLast(partArray->GetEntriesFast());
preventry = entry;
}
else
pdgMother = part->GetPdgCode();
+
switch (pdgMother){
case 111:
dNdy = fYieldArray[kGenPizero];
case 443:
dNdy = fYieldArray[kGenJpsi];
break;
-
default:
dNdy = 0.;
}
+
+ switch (pdgMother){
+ case 221000:
+ dNdy = fYieldArray[kGenPromptRealGamma];
+ break;
+ case 223000:
+ dNdy = fYieldArray[kGenPromptVirtGamma];
+ break;
+ case 222000:
+ dNdy = fYieldArray[kGenThermRealGamma];
+ break;
+ case 224000:
+ dNdy = fYieldArray[kGenThermVirtGamma];
+ break;
+ }
weight = dNdy*part->GetWeight();
part->SetWeight(weight);
}
public:
AliGenEMCocktail();
- enum GeneratorCode { kGenPizero=0, kGenEta, kGenRho, kGenOmega, kGenEtaprime, kGenPhi, kGenJpsi, kGENs };
+ enum GeneratorCode { kGenPizero=0, kGenEta, kGenRho, kGenOmega, kGenEtaprime, kGenPhi, kGenJpsi, kGenPromptRealGamma, kGenThermRealGamma, kGenPromptVirtGamma, kGenThermVirtGamma, kGENs };
virtual ~AliGenEMCocktail();
virtual void Init();
void SetForceGammaConversion(Bool_t force=kTRUE){ fForceConv=force; }
void SetHeaviestParticle(Int_t part){ fHeaviestParticle=part; }
-protected:
-
- TVector3& OrthogonalVector(TVector3 &inVec);
-
private:
AliGenEMCocktail(const AliGenEMCocktail &cocktail);
AliGenEMCocktail & operator=(const AliGenEMCocktail &cocktail);
const Double_t AliGenEMlib::fgkV2param[16][15] = {
// charged pion cent, based on
{ 0.0000000000, 0.0000000000, 0.0000000000,-1.0000000000, 1.0000000000, 0.0000000000, 0.0000000000, 0.0000000000, 2.0000000000, 0.0000000000, 1.0000000000, 0, 1, 0.0000000000, 1.0000000000 } // pp no V2
- ,{ 6.792545e-02, 1.324227e+00, 2.071866e-02, 3.385157e+00, 5.183718e+00, 2.783082e-02, 5.000000e+00, 4.078812e+00, 5.444857e-02, 1.555569e-03, 1.099253e+00, 0, 1, 8.823293e-04, 1.310387e+00 } // 0-5, Francesco
- ,{ 1.219655e-01, 1.237698e+00, 2.595132e-02, 3.157085e+00, 3.697252e+00, 4.576262e-02, 1.103851e+00, 5.102592e+00, 1.072299e-01, 2.338602e-03, 8.475128e-01, 0, 1, 1.631554e-03, 9.432292e-01 } // 5-10, Francesco
- ,{ 1.758981e-01, 1.253238e+00, 2.823197e-02, 3.455476e+00, 4.283204e+00, 6.053191e-02, 6.737159e-01, 4.420205e+00, 1.733567e-01, 3.292614e-03, 6.389341e-01, 0, 1, 3.234254e-03, 5.304084e-01 } // 10-20,Francesco
- ,{ 2.231108e-01, 1.316781e+00, 3.537289e-02, 3.228243e+00, 3.697226e+00, 7.131631e-02, 5.902192e-01, 4.938186e+00, 2.123481e-01, 4.775233e-03, 5.707533e-01, 0, 1, 3.906720e-03, 5.261247e-01 } // 20-30,Francesco
- ,{ 2.045341e-01, 1.324054e+00, 1.125395e-01, 2.179936e+00, 5.614603e+00, 8.946014e-02, 5.601938e-01, 2.959228e+00, 3.669442e-01, 5.318697e-03, 6.032741e-01, 0, 1, 4.231316e-03, 5.563485e-01 } // 30-40,Francesco
- ,{ 2.074778e-01, 1.894322e+00, 6.019224e-02, 2.414500e+00, 3.822721e+00, 9.891310e-02, 4.976126e-01, 1.256500e+00, 5.210237e-01, 5.687290e-03, 6.785355e-01, 0, 1, 3.954051e-03, 6.913428e-01 } // 40-50,Francesco
- ,{ 1.961099e-01, 2.122719e+00, 7.633636e-02, 1.731213e+00, 2.427536e+00, 1.026013e-01, 7.932261e-01, 4.082226e+00, 2.495494e-01, 5.677386e-03, 8.405024e-01, 0, 1, 2.961753e-03, 1.008892e+00 } // 50-60,Francesco
+ ,{ 6.551541e-02, 1.438274e+00, 4.626379e-02, 2.512477e+00, 1.371824e+00, 2.964543e-02, 4.630670e+00, 4.228889e+00, 6.037970e-02, 1.425269e-03, 1.144124e+00, 0, 1, 9.154016e-04, 1.288285e+00 } // 0-5, Francesco
+ ,{ 1.171360e-01, 1.333046e+00, 4.536752e-02, 3.046448e+00, 3.903714e+00, 4.407124e-02, 9.122534e-01, 4.834519e+00, 1.186237e-01, 2.179274e-03, 8.968478e-01, 0, 1, 1.501201e-03, 9.902785e-01 } // 5-10, Francesco
+ ,{ 1.748423e-01, 1.285211e+00, 4.219624e-02, 4.019148e+00, 4.255047e+00, 7.956751e-03, 1.184731e-01,-9.211391e+00, 5.768716e-01, 3.127110e-03, 6.808650e-01, 0, 1, 2.786807e-03, 6.159338e-01 } // 10-20,Francesco
+ ,{ 2.152937e-01, 1.405391e+00, 5.037925e-02, 3.214458e+00, 3.991894e+00, 3.655882e-02, 1.968766e-01,-1.637650e+01, 7.023397e+00, 4.573453e-03, 6.031381e-01, 0, 1, 3.564348e-03, 5.748053e-01 } // 20-30,Francesco
+ ,{ 2.409800e-01, 1.476557e+00, 5.759362e-02, 3.339713e+00, 3.642386e+00,-1.544366e-02, 1.098611e-01,-1.373154e+01, 1.471955e+00, 5.200180e-03, 6.315474e-01, 0, 1, 3.776112e-03, 6.298605e-01 } // 30-40,Francesco
+ ,{ 2.495087e-01, 1.543711e+00, 6.217817e-02, 3.517101e+00, 4.558221e+00, 6.021316e-02, 1.486822e-01,-5.769155e+00, 5.576843e-01, 5.348029e-03, 7.255976e-01, 0, 1, 3.531350e-03, 7.661694e-01 } // 40-50,Francesco
+ ,{ 2.166449e-01, 1.931014e+00, 8.195656e-02, 2.226742e+00, 3.106472e+00, 1.058786e-01, 8.558786e-01, 4.006680e+00, 2.476313e-01, 5.137623e-03, 9.104401e-01, 0, 1, 2.477450e-03, 1.109649e+00 } // 50-60,Francesco
,{ 0.0000000000, 0.0000000000, 0.0000000000,-1.0000000000, 1.0000000000, 0.0000000000, 0.0000000000, 0.0000000000, 2.0000000000, 0.0000000000, 1.0000000000, 0, 1, 0.0000000000, 1.0000000000 } // 0-10
,{ 0.0000000000, 0.0000000000, 0.0000000000,-1.0000000000, 1.0000000000, 0.0000000000, 0.0000000000, 0.0000000000, 2.0000000000, 0.0000000000, 1.0000000000, 0, 1, 0.0000000000, 1.0000000000 } // 20-40
,{ 0.0000000000, 0.0000000000, 0.0000000000,-1.0000000000, 1.0000000000, 0.0000000000, 0.0000000000, 0.0000000000, 2.0000000000, 0.0000000000, 1.0000000000, 0, 1, 0.0000000000, 1.0000000000 } // 40-60
,{ 0.0000000000, 0.0000000000, 0.0000000000,-1.0000000000, 1.0000000000, 0.0000000000, 0.0000000000, 0.0000000000, 2.0000000000, 0.0000000000, 1.0000000000, 0, 1, 0.0000000000, 1.0000000000 } // 40-80
};
+const Double_t AliGenEMlib::fgkRawPtOfV2Param[16][10] = {
+ { 0.0000000000, 0.0000000000, 0.0000000000, 0.0000000000,-1.0000000000, 1.0000000000,-1.0000000000, 1.0000000000, 0.0000000000, 0.0000000000 } // pp no V2
+ ,{ 2.181446e+08, 9.412925e-01, 1.158774e-01, 3.020303e+01, 6.790828e+00, 9.999996e+01, 2.616827e+00, 3.980492e+00, 1.225169e+07, 5.575243e+00 } // 0-5
+ ,{ 3.006215e+08, 9.511881e-01, 1.192788e-01, 2.981931e+01, 5.068175e+01, 9.999993e+01, 2.650635e+00, 4.073982e+00, 2.508045e+07, 5.621039e+00 } // 5-10
+ ,{ 1.643438e+09, 9.604242e-01, 1.218512e-01, 2.912684e+01, 1.164242e+00, 9.999709e+01, 2.662326e+00, 4.027795e+00, 7.020810e+07, 5.696860e+00 } // 10-20
+ ,{ 8.109985e+08, 9.421935e-01, 1.328020e-01, 2.655910e+01, 1.053677e+00, 9.999812e+01, 2.722949e+00, 3.964547e+00, 6.104096e+07, 5.694703e+00 } // 20-30
+ ,{ 5.219789e+08, 9.417339e-01, 1.417541e-01, 2.518080e+01, 7.430803e-02, 9.303295e+01, 2.780227e+00, 3.909570e+00, 4.723116e+07, 5.778375e+00 } // 30-40
+ ,{ 2.547159e+08, 9.481459e-01, 2.364858e-01, 1.689288e+01, 3.858883e+00, 6.352619e+00, 2.742270e+00, 3.855226e+00, 3.120535e+07, 5.878677e+00 } // 40-50
+ ,{ 9.396097e+07, 9.304491e-01, 3.244940e-01, 1.291696e+01, 2.854367e+00, 6.325908e+00, 2.828258e+00, 4.133699e+00, 1.302739e+07, 5.977896e+00 } // 50-60
+ ,{ 0.0000000000, 0.0000000000, 0.0000000000, 0.0000000000,-1.0000000000, 1.0000000000,-1.0000000000, 1.0000000000, 0.0000000000, 0.0000000000 } // 0-10
+ ,{ 0.0000000000, 0.0000000000, 0.0000000000, 0.0000000000,-1.0000000000, 1.0000000000,-1.0000000000, 1.0000000000, 0.0000000000, 0.0000000000 } // 20-40
+ ,{ 0.0000000000, 0.0000000000, 0.0000000000, 0.0000000000,-1.0000000000, 1.0000000000,-1.0000000000, 1.0000000000, 0.0000000000, 0.0000000000 } // 40-60
+ ,{ 0.0000000000, 0.0000000000, 0.0000000000, 0.0000000000,-1.0000000000, 1.0000000000,-1.0000000000, 1.0000000000, 0.0000000000, 0.0000000000 } // 60-80
+ ,{ 0.0000000000, 0.0000000000, 0.0000000000, 0.0000000000,-1.0000000000, 1.0000000000,-1.0000000000, 1.0000000000, 0.0000000000, 0.0000000000 } // 0-20
+ ,{ 0.0000000000, 0.0000000000, 0.0000000000, 0.0000000000,-1.0000000000, 1.0000000000,-1.0000000000, 1.0000000000, 0.0000000000, 0.0000000000 } // 0-40
+ ,{ 0.0000000000, 0.0000000000, 0.0000000000, 0.0000000000,-1.0000000000, 1.0000000000,-1.0000000000, 1.0000000000, 0.0000000000, 0.0000000000 } // 20-80
+ ,{ 0.0000000000, 0.0000000000, 0.0000000000, 0.0000000000,-1.0000000000, 1.0000000000,-1.0000000000, 1.0000000000, 0.0000000000, 0.0000000000 } // 40-80
+};
+
+const Double_t AliGenEMlib::fgkThermPtParam[16][2] = {
+ { 0.0000000000, 0.0000000000 } // pp no V2
+ ,{ 0.0000000000, 0.0000000000 } // 0-5
+ ,{ 0.0000000000, 0.0000000000 } // 5-10
+ ,{ 2.581823e+01, 3.187900e+00 } // 10-20 //from: https://aliceinfo.cern.ch/Notes/node/249
+ ,{ 0.0000000000, 0.0000000000 } // 20-30
+ ,{ 0.0000000000, 0.0000000000 } // 30-40
+ ,{ 0.0000000000, 0.0000000000 } // 40-50
+ ,{ 0.0000000000, 0.0000000000 } // 50-60
+ ,{ 7.177551e+02, 4.946179e+00 } // 0-10 //from: https://aliceinfo.cern.ch/Notes/node/249
+ ,{ 2.328661e+00, 2.635257e+00 } // 20-40 //from: https://twiki.cern.ch/twiki/pub/ALICE/ALICEDirectPhotonSpectrumPaper/directPbPb.pdf
+ ,{ 0.0000000000, 0.0000000000 } // 40-60
+ ,{ 0.0000000000, 0.0000000000 } // 60-80
+ ,{ 1.919280e+01, 2.946472e+00 } // 0-20 //from: https://twiki.cern.ch/twiki/pub/ALICE/ALICEDirectPhotonSpectrumPaper/directPbPb.pdf
+ ,{ 0.0000000000, 0.0000000000 } // 0-40
+ ,{ 0.0000000000, 0.0000000000 } // 20-80
+ ,{ 0.0000000000, 0.0000000000 } // 40-80
+};
+
// MASS 0=>PIZERO, 1=>ETA, 2=>RHO, 3=>OMEGA, 4=>ETAPRIME, 5=>PHI, 6=>JPSI
-const Double_t AliGenEMlib::fgkHM[7] = {0.13498, 0.54751, 0.7755, 0.78265, 0.95778, 1.01946, 3.0969};
+const Double_t AliGenEMlib::fgkHM[8] = {0.13498, 0.54751, 0.7755, 0.78265, 0.95778, 1.01946, 3.0969, 0.0};
-const Double_t AliGenEMlib::fgkMtFactor[2][7] = {
+const Double_t AliGenEMlib::fgkMtFactor[2][8] = {
// {1.0, 0.5, 1.0, 0.9, 0.4, 0.23, 0.054}, // factor for pp from arXiv:1110.3929
// {1.0, 0.55, 1.0, 0.9, 0.4, 0.25, 0.004} // factor for PbPb from arXiv:1110.3929
//{1., 0.48, 1.0, 0.9, 0.25, 0.4}, (old values)
//https://aliceinfo.cern.ch/Figure/node/2788
//https://aliceinfo.cern.ch/Figure/node/4403
//J/Psi PbPb from Comparison with Julian Books J/Psi -> e+e-, might be contradicting with https://aliceinfo.cern.ch/Figure/node/3457
+ //https://aliceinfo.cern.ch/Notes/node/87
//best guess:
- {1., 0.4, 1.0, 0.8, 0.4, 0.2, 0.0054}, //pp
- {1., 0.4, 1.0, 0.8, 0.4, 0.25, 0.01} //PbPb
+ {1., 0.48, 1.0, 0.9, 0.4, 0.25, 0.004, 0.}, //pp
+ {1., 0.48, 1.0, 0.9, 0.4, 0.25, 0.0195, 0.} //PbPb
};
//==========================================================================
return invYield*(2*TMath::Pi()*pt);
}
+// Exponential
+Double_t AliGenEMlib::PtExponential(const Double_t *px, const Double_t *c){
+ const double &pt=px[0];
+ Double_t invYield = c[0]*exp(-pt*c[1]);
+
+ return invYield*(2*TMath::Pi()*pt);
+}
+
+// Hagedorn with additional Powerlaw
+Double_t AliGenEMlib::PtModifiedHagedornPowerlaw(const Double_t *px, const Double_t *c){
+ double pt=px[0]+0.0001;
+ Double_t invYield = c[0]*pow(c[1]+pt*c[2],-c[3])*CrossOverLc(c[5],c[4],pt)+CrossOverRc(c[7],c[6],pt)*c[8]*pow(pt,-c[9]);
+
+ return invYield*(2*TMath::Pi()*pt);
+}
+
+Double_t AliGenEMlib::IntegratedKrollWada(Double_t mh){
+ if(mh<0.003) return 0;
+ const double me=0.000511;
+ return 2*log(mh/me/exp(7.0/4.0))/411.0/TMath::Pi();
+}
+
+//--------------------------------------------------------------------------
+//
+// PromptRealGamma
+//
+//--------------------------------------------------------------------------
+Int_t AliGenEMlib::IpPromptRealGamma(TRandom *)
+{
+ return 221000;
+}
+
+Double_t AliGenEMlib::PtPromptRealGamma( const Double_t *px, const Double_t */*dummy*/ )
+{
+ //if(*px<0.001) return 0;
+ const static Double_t promptGammaPtParam[10] = { 7.019259e-02, 6.771695e-01, 8.249346e-01, 5.720419e+00, 1.848869e+01, 2.629075e+01, 1.061126e+01, 3.699205e+01, 5.253572e-02, 5.167275e+00 };
+ //{ 5.449971e-02, 3.843241e-01, 9.469766e-01, 4.993039e+00, 5.342451e+00, 4.457944e+00, 5.555146e+00, 4.458580e+00, 6.035177e-02, 5.102109e+00 };
+
+ return PtModifiedHagedornPowerlaw(px,promptGammaPtParam)*GetTAA(fgSelectedCentrality);
+}
+
+Double_t AliGenEMlib::YPromptRealGamma( const Double_t *px, const Double_t */*dummy*/ )
+{
+ return YFlat(*px);
+}
+
+Double_t AliGenEMlib::V2PromptRealGamma( const Double_t */*px*/, const Double_t */*dummy*/ )
+{
+ return 0.0;
+}
+
+//--------------------------------------------------------------------------
+//
+// PromptVirtGamma
+//
+//--------------------------------------------------------------------------
+Int_t AliGenEMlib::IpPromptVirtGamma(TRandom *)
+{
+ return 223000;
+}
+
+Double_t AliGenEMlib::PtPromptVirtGamma( const Double_t *px, const Double_t */*dummy*/ )
+{
+ return IntegratedKrollWada(*px)*PtPromptRealGamma(px,px);
+}
+
+Double_t AliGenEMlib::YPromptVirtGamma( const Double_t *px, const Double_t */*dummy*/ )
+{
+ return YFlat(*px);
+}
+
+Double_t AliGenEMlib::V2PromptVirtGamma( const Double_t */*px*/, const Double_t */*dummy*/ )
+{
+ return 0.0;
+}
+
+//--------------------------------------------------------------------------
+//
+// ThermRealGamma
+//
+//--------------------------------------------------------------------------
+Int_t AliGenEMlib::IpThermRealGamma(TRandom *)
+{
+ return 222000;
+}
+
+Double_t AliGenEMlib::PtThermRealGamma( const Double_t *px, const Double_t */*dummy*/ )
+{
+ return PtExponential(px,fgkThermPtParam[fgSelectedCentrality]);
+}
+
+Double_t AliGenEMlib::YThermRealGamma( const Double_t *px, const Double_t */*dummy*/ )
+{
+ return YFlat(*px);
+}
+
+Double_t AliGenEMlib::V2ThermRealGamma( const Double_t *px, const Double_t */*dummy*/ )
+{
+ return KEtScal(*px,8);
+}
+
+//--------------------------------------------------------------------------
+//
+// ThermVirtGamma
+//
+//--------------------------------------------------------------------------
+Int_t AliGenEMlib::IpThermVirtGamma(TRandom *)
+{
+ return 224000;
+}
+
+Double_t AliGenEMlib::PtThermVirtGamma( const Double_t *px, const Double_t */*dummy*/ )
+{
+ return IntegratedKrollWada(*px)*PtThermRealGamma(px,px);
+}
+
+Double_t AliGenEMlib::YThermVirtGamma( const Double_t *px, const Double_t */*dummy*/ )
+{
+ return YFlat(*px);
+}
+Double_t AliGenEMlib::V2ThermVirtGamma( const Double_t *px, const Double_t */*dummy*/ )
+{
+ return KEtScal(*px,8);
+}
//--------------------------------------------------------------------------
//
Double_t AliGenEMlib::PtPizero( const Double_t *px, const Double_t */*dummy*/ )
{
+ // double pigammacorr=2.385389e-01*log(*px+0.001)+1.557687e+00;
+ // pigammacorr*=9.513666e-03*log(*px+0.001)+9.509347e-01;
+ // return pigammacorr*PtPromptRealGamma(px,px); //misuse pion for direct gammas
+
// fit functions and corresponding parameter of Pizero pT for pp @ 2.76 TeV and @ 7 TeV and for PbPb @ 2.76 TeV
Double_t km=0.;
Double_t AliGenEMlib::V2Pizero( const Double_t *px, const Double_t */*dummy*/ )
{
- int selectedCentrality;
double n1,n2,v1,v2;
switch(fgSelectedCentrality) {
case k0010:
- selectedCentrality=fgSelectedCentrality;
- fgSelectedCentrality=k0005;
- n1=PtPizero(px,(Double_t*) 0);
- v1=V2Param(px,fgkV2param[fgSelectedCentrality]);
- fgSelectedCentrality=k0510;
- n2=PtPizero(px,(Double_t*) 0);
- v2=V2Param(px,fgkV2param[fgSelectedCentrality]);
- fgSelectedCentrality=selectedCentrality;
+ n1=PtModifiedHagedornPowerlaw(px,fgkRawPtOfV2Param[k0005]);
+ v1=V2Param(px,fgkV2param[k0005]);
+ n2=PtModifiedHagedornPowerlaw(px,fgkRawPtOfV2Param[k0510]);
+ v2=V2Param(px,fgkV2param[k0510]);
return (n1*v1+n2*v2)/(n1+n2);
break;
case k2040:
- selectedCentrality=fgSelectedCentrality;
- fgSelectedCentrality=k2030;
- n1=PtPizero(px,(Double_t*) 0);
- v1=V2Param(px,fgkV2param[fgSelectedCentrality]);
- fgSelectedCentrality=k3040;
- n2=PtPizero(px,(Double_t*) 0);
- v2=V2Param(px,fgkV2param[fgSelectedCentrality]);
- fgSelectedCentrality=selectedCentrality;
+ n1=PtModifiedHagedornPowerlaw(px,fgkRawPtOfV2Param[k2030]);
+ v1=V2Param(px,fgkV2param[k2030]);
+ n2=PtModifiedHagedornPowerlaw(px,fgkRawPtOfV2Param[k3040]);
+ v2=V2Param(px,fgkV2param[k3040]);
return (n1*v1+n2*v2)/(n1+n2);
break;
}
}
-
-
//--------------------------------------------------------------------------
//
// Eta
Double_t AliGenEMlib::KEtScal(const Double_t pt, Int_t np)
{
const int nq=2; //number of quarks for particle np, here always 2
- Double_t scaledPt = sqrt(pow(2/nq*(sqrt(pt*pt+fgkHM[np]*fgkHM[np])-fgkHM[np])+fgkHM[0],2)-fgkHM[0]*fgkHM[0]);
- double val=V2Pizero(&scaledPt, (Double_t*) 0);
- static const double syserr[12]={0., 0.09, 0.07, 0.06, 0.04, 0.04, 0.04, 0.05, 0., 0., 0., 0.}; //based on pi vs kaon
- double sys=fgSelectedV2Systematic*min(fgkV2param[fgSelectedCentrality][0],fgkV2param[fgSelectedCentrality][8])*syserr[fgSelectedCentrality];
- return TMath::Max(val+sys,0.0);
+ Double_t scaledPt = sqrt(pow(2.0/nq*(sqrt(pt*pt+fgkHM[np]*fgkHM[np])-fgkHM[np])+fgkHM[0],2)-fgkHM[0]*fgkHM[0]);
+ // double val=V2Pizero(&scaledPt, (Double_t*) 0);
+ // static const double syserr[12]={0., 0.09, 0.07, 0.06, 0.04, 0.04, 0.04, 0.05, 0., 0., 0., 0.}; //based on pi vs kaon
+ // double sys=fgSelectedV2Systematic*min(fgkV2param[fgSelectedCentrality][0],fgkV2param[fgSelectedCentrality][8])*syserr[fgSelectedCentrality];
+ // return TMath::Max(val+sys,0.0);
+ return V2Pizero(&scaledPt, (Double_t*) 0);
}
Double_t AliGenEMlib::V2Param(const Double_t *px, const Double_t *par)
{
// Flat v2
- return 1.0;
+ return 0.0;
}
-
+Double_t AliGenEMlib::GetTAA(Int_t cent){
+ const static Double_t taa[16] = { 1.0, // pp
+ 26.32, // 0-5
+ 20.56, // 5-10
+ 14.39, // 10-20
+ 8.70, // 20-30
+ 5.001, // 30-40
+ 2.675, // 40-50
+ 1.317, // 50-60
+ 23.44, // 0-10
+ 6.85, // 20-40
+ 1.996, // 40-60
+ 0.4174, // 60-80
+ 18.91, // 0-20
+ 12.88, // 0-40
+ 3.088, // 20-80
+ 1.207}; // 40-80
+ return taa[cent];
+}
//==========================================================================
//
switch (param)
{
+ case kPromptRealGamma:
+ func=PtPromptRealGamma;
+ break;
+ case kPromptVirtGamma:
+ func=PtPromptVirtGamma;
+ break;
+ case kThermRealGamma:
+ func=PtThermRealGamma;
+ break;
+ case kThermVirtGamma:
+ func=PtThermVirtGamma;
+ break;
case kPizero:
func=PtPizero;
break;
switch (param)
{
+ case kPromptRealGamma:
+ func=YPromptRealGamma;
+ break;
+ case kPromptVirtGamma:
+ func=YPromptVirtGamma;
+ break;
+ case kThermRealGamma:
+ func=YThermRealGamma;
+ break;
+ case kThermVirtGamma:
+ func=YThermVirtGamma;
+ break;
case kPizero:
func=YPizero;
break;
switch (param)
{
+ case kPromptRealGamma:
+ func=IpPromptRealGamma;
+ break;
+ case kPromptVirtGamma:
+ func=IpPromptVirtGamma;
+ break;
+ case kThermRealGamma:
+ func=IpThermRealGamma;
+ break;
+ case kThermVirtGamma:
+ func=IpThermVirtGamma;
+ break;
case kPizero:
func=IpPizero;
break;
switch (param)
{
+ case kPromptRealGamma:
+ func=V2PromptRealGamma;
+ break;
+ case kPromptVirtGamma:
+ func=V2PromptVirtGamma;
+ break;
+ case kThermRealGamma:
+ func=V2ThermRealGamma;
+ break;
+ case kThermVirtGamma:
+ func=V2ThermVirtGamma;
+ break;
case kPizero:
func=V2Pizero;
break;
class AliGenEMlib :public AliGenLib {
public:
- enum particles{kPizero, kEta, kRho, kOmega, kEtaprime, kPhi, kJpsi};
- enum centrality{kpp=0x0, k0005=0x1, k0510=0x2, k1020=0x3, k2030=0x4, k3040=0x5, k4050=0x6, k5060=0x7, k0010=0x8, k2040=0x9, k4060=0xA, k6080=0xB, k0020=0xC, k0040=0xD, k2080=0xE, k4080=0xF, kCentralities=0x10};
- enum PtParamSet{kPizero7TeVpp=0x10, kPizeroEta7TeVpp=0x20, kPizero7TeVpplow=0x30, kPizeroEta7TeVpplow=0x40, kPizero7TeVpphigh=0x50, kPizeroEta7TeVpphigh=0x60, kPizero2760GeVpp=0x70, kPizeroEta2760GeVpp=0x80, kPizero2760GeVpplow=0x90, kPizeroEta2760GeVpplow=0xA0, kPizero2760GeVpphigh=0xB0, kPizeroEta2760GeVpphigh=0xC0, kPichargedPbPb=0xD0, kPizeroPbPb=0xE0, kPichargedPPb=0xF0 };
- enum v2Sys{kLoV2Sys=-1, kNoV2Sys=0, kUpV2Sys=+1};
+ enum Particle_t{kPromptRealGamma, kPromptVirtGamma, kThermRealGamma, kThermVirtGamma, kPizero, kEta, kRho, kOmega, kEtaprime, kPhi, kJpsi};
+ enum Centrality_t{kpp=0x0, k0005=0x1, k0510=0x2, k1020=0x3, k2030=0x4, k3040=0x5, k4050=0x6, k5060=0x7, k0010=0x8, k2040=0x9, k4060=0xA, k6080=0xB, k0020=0xC, k0040=0xD, k2080=0xE, k4080=0xF, kCentralities=0x10};
+ enum PtParamSet_t{kPizero7TeVpp=0x10, kPizeroEta7TeVpp=0x20, kPizero7TeVpplow=0x30, kPizeroEta7TeVpplow=0x40, kPizero7TeVpphigh=0x50, kPizeroEta7TeVpphigh=0x60, kPizero2760GeVpp=0x70, kPizeroEta2760GeVpp=0x80, kPizero2760GeVpplow=0x90, kPizeroEta2760GeVpplow=0xA0, kPizero2760GeVpphigh=0xB0, kPizeroEta2760GeVpphigh=0xC0, kPichargedPbPb=0xD0, kPizeroPbPb=0xE0, kPichargedPPb=0xF0 };
+ enum v2Sys_t{kLoV2Sys=-1, kNoV2Sys=0, kUpV2Sys=+1};
AliGenEMlib() { } ;
const Double_t T,
const Double_t n);
+ static Double_t PtExponential(const Double_t *pt, const Double_t *param);
+ static Double_t PtModifiedHagedornPowerlaw(const Double_t *pt, const Double_t *param);
+ static Double_t IntegratedKrollWada(Double_t mh);
+ // prompt gamma
+ static Int_t IpPromptRealGamma(TRandom *ran);
+ static Double_t PtPromptRealGamma(const Double_t *px, const Double_t *dummy);
+ static Double_t YPromptRealGamma(const Double_t *py, const Double_t *dummy);
+ static Double_t V2PromptRealGamma(const Double_t *px, const Double_t *dummy);
+ static Int_t IpPromptVirtGamma(TRandom *ran);
+ static Double_t PtPromptVirtGamma(const Double_t *px, const Double_t *dummy);
+ static Double_t YPromptVirtGamma(const Double_t *py, const Double_t *dummy);
+ static Double_t V2PromptVirtGamma(const Double_t *px, const Double_t *dummy);
+
+ // thermal gamma
+ static Int_t IpThermRealGamma(TRandom *ran);
+ static Double_t PtThermRealGamma(const Double_t *px, const Double_t *dummy);
+ static Double_t YThermRealGamma(const Double_t *py, const Double_t *dummy);
+ static Double_t V2ThermRealGamma(const Double_t *px, const Double_t *dummy);
+
+ static Int_t IpThermVirtGamma(TRandom *ran);
+ static Double_t PtThermVirtGamma(const Double_t *px, const Double_t *dummy);
+ static Double_t YThermVirtGamma(const Double_t *py, const Double_t *dummy);
+ static Double_t V2ThermVirtGamma(const Double_t *px, const Double_t *dummy);
// Pizero
static Int_t IpPizero(TRandom *ran);
static Double_t V2Param(const Double_t *px, const Double_t *param);
static Double_t V2Flat(const Double_t *px, const Double_t *param);
static Double_t KEtScal(Double_t pt, Int_t np);
+ static Double_t GetTAA(Int_t cent);
static Double_t CrossOverLc(const double a, const double b, const double x);
static Double_t CrossOverRc(const double a, const double b, const double x);
- static const Double_t fgkV2param[16][15]; // array of v2 parameter
- static const Double_t fgkHM[7];
- static const Double_t fgkMtFactor[2][7];
+ static const Double_t fgkV2param[16][15]; // parameters of pi v2
+ static const Double_t fgkRawPtOfV2Param[16][10]; // parameters of the raw pt spectrum of v2 analysys
+ static const Double_t fgkThermPtParam[16][2]; // parameters of thermal gamma pt
+ static const Double_t fgkHM[8]; // particle masses
+ static const Double_t fgkMtFactor[2][8]; // mt scaling factor
ClassDef(AliGenEMlib,0)
};
return res;
}
-double AliGenParam::ScreenFunc1(double d){
- if(d>1)
- return 21.12-4.184*log(d+0.952);
+void AliGenParam::RotateVector(Double_t *pin, Double_t *pout, Double_t costheta, Double_t sintheta,
+ Double_t cosphi, Double_t sinphi)
+{
+ // Perform rotation
+ pout[0] = pin[0]*costheta*cosphi-pin[1]*sinphi+pin[2]*sintheta*cosphi;
+ pout[1] = pin[0]*costheta*sinphi+pin[1]*cosphi+pin[2]*sintheta*sinphi;
+ pout[2] = -1.0 * pin[0] * sintheta + pin[2] * costheta;
+ return;
+}
+
+Double_t AliGenParam::IntegratedKrollWada(Double_t mh){
+ if(mh<0.003) return 0;
+ return 2*log(mh/0.000511/exp(7.0/4.0))/411.0/TMath::Pi();
+}
+
+double AliGenParam::ScreenFunction1(double screenVariable){
+ if(screenVariable>1)
+ return 42.24 - 8.368 * log(screenVariable + 0.952);
else
- return 20.867-3.242*d+0.652*d*d;
+ return 42.392 - screenVariable * (7.796 - 1.961 * screenVariable);
}
-double AliGenParam::ScreenFunc2(double d){
- if(d>1)
- return 21.12-4.184*log(d+0.952);
+double AliGenParam::ScreenFunction2(double screenVariable){
+ if(screenVariable>1)
+ return 42.24 - 8.368 * log(screenVariable + 0.952);
else
- return 20.209-1.93*d-0.086*d*d;
+ return 41.405 - screenVariable * (5.828 - 0.8945 * screenVariable);
}
-double AliGenParam::EnergyFraction(double Z, double E){
- double e0=0.000511/E;
+double AliGenParam::RandomEnergyFraction(double Z, double photonEnergy){
double aZ=Z/137.036;
- double dmin=ScreenVar(Z,e0,0.5);
+ double epsilon ;
+ double epsilon0Local = 0.000511 / photonEnergy ;
+
+ // Do it fast if photon energy < 2. MeV
+ if (photonEnergy < 0.002 )
+ {
+ epsilon = epsilon0Local + (0.5 - epsilon0Local) * fRandom->Rndm();
+ }
+ else
+ {
+ double fZ = 8*log(Z)/3;
double fcZ=(aZ*aZ)*(1/(1+aZ*aZ)+0.20206-0.0368*aZ*aZ+0.0083*aZ*aZ*aZ);
- double Fz=8*log(Z)/3;
- if(E>0.05)
- Fz+=8*fcZ;
- double dmax=exp((42.24-Fz)/8.368)-0.952;
- if(!(dmax>dmin))
- return fRandom->Uniform(e0,0.5);
-
- double e1=0.5-0.5*sqrt(1-dmin/dmax);
- double emin=TMath::Max(e0,e1);
+ if (photonEnergy > 0.050) fZ += 8*fcZ;
+
+ // Limits of the screening variable
+ double screenFactor = 136. * epsilon0Local / pow (Z,1/3);
+ double screenMax = exp ((42.24 - fZ)/8.368) - 0.952 ;
+ double screenMin = std::min(4.*screenFactor,screenMax) ;
+
+ // Limits of the energy sampling
+ double epsilon1 = 0.5 - 0.5 * sqrt(1. - screenMin / screenMax) ;
+ double epsilonMin = std::max(epsilon0Local,epsilon1);
+ double epsilonRange = 0.5 - epsilonMin ;
+
+ // Sample the energy rate of the created electron (or positron)
+ double screen;
+ double gReject ;
+
+ double f10 = ScreenFunction1(screenMin) - fZ;
+ double f20 = ScreenFunction2(screenMin) - fZ;
+ double normF1 = std::max(f10 * epsilonRange * epsilonRange,0.);
+ double normF2 = std::max(1.5 * f20,0.);
+
+ do
+ {
+ if (normF1 / (normF1 + normF2) > fRandom->Rndm() )
+ {
+ epsilon = 0.5 - epsilonRange * pow(fRandom->Rndm(), 0.333333) ;
+ screen = screenFactor / (epsilon * (1. - epsilon));
+ gReject = (ScreenFunction1(screen) - fZ) / f10 ;
+ }
+ else
+ {
+ epsilon = epsilonMin + epsilonRange * fRandom->Rndm();
+ screen = screenFactor / (epsilon * (1 - epsilon));
+ gReject = (ScreenFunction2(screen) - fZ) / f20 ;
+ }
+ } while ( gReject < fRandom->Rndm() );
+
+ } // End of epsilon sampling
+ return epsilon;
+}
+
+double AliGenParam::RandomPolarAngle(){
+ double u;
+ const double a1 = 0.625;
+ double a2 = 3. * a1;
+ // double d = 27. ;
+
+ // if (9. / (9. + d) > fRandom->Rndm())
+ if (0.25 > fRandom->Rndm())
+ {
+ u = - log(fRandom->Rndm() * fRandom->Rndm()) / a1 ;
+ }
+ else
+ {
+ u = - log(fRandom->Rndm() * fRandom->Rndm()) / a2 ;
+ }
+ return u*0.000511;
+}
- double normval=1/(0.5*(ScreenFunc1(dmin)-0.5*Fz)+0.1666667*(ScreenFunc2(dmin)-0.5*Fz));
+Double_t AliGenParam::RandomMass(Double_t mh){
while(true){
- double y=fRandom->Uniform(emin,1);
- double eps=y*(0.38453+y*(0.10234+y*(0.026072+y*(0.014367-0.027313*y)))); //inverse to the enveloping cumulative probability distribution
- double val=fRandom->Uniform(0,2.12*(eps*eps-eps)+1.53); //enveloping probability density
- double d=ScreenVar(Z,e0,eps);
- double bh=((eps*eps)+(1-eps)*(1-eps))*(ScreenFunc1(d)-0.5*Fz)+0.6666667*eps*(1-eps)*(ScreenFunc2(d)-0.5*Fz);
- bh*=normval;
- if(val<bh)
- return eps;
+ double y=fRandom->Rndm();
+ double mee=2*0.000511*TMath::Power(2*0.000511/mh,-y); //inverse of the enveloping cumulative distribution
+ double apxkw=2.0/3.0/137.036/TMath::Pi()/mee;
+ double val=fRandom->Uniform(0,apxkw); //enveloping probability density0
+ double kw=apxkw*sqrt(1-4*0.000511*0.000511/mee/mee)*(1+2*0.000511*0.000511/mee/mee)*1*1*TMath::Power(1-mee*mee/mh/mh,3);
+ if(val<kw)
+ return mee;
}
}
-double AliGenParam::PolarAngle(double E){
- float rand[3];
- AliRndm rndm;
- rndm.Rndm(rand,3);
- double u=-8*log(rand[1]*rand[2])/5;
- if(!(rand[0]<9.0/36))
- u/=3;
- return u*0.000511/E;
+Int_t AliGenParam::VirtualGammaPairProduction(TClonesArray *particles, Int_t nPart)
+{
+ Int_t nPartNew=nPart;
+ for(int iPart=0; iPart<nPart; iPart++){
+ TParticle *gamma = (TParticle *) particles->At(iPart);
+ if(gamma->GetPdgCode()!=223000 || gamma->GetPdgCode()!=224000) continue;
+ //if(gamma->Energy()<0.001022) continue; //can never be
+ double mass=RandomMass(gamma->Pt());
+
+ // lepton pair kinematics in virtual photon rest frame
+ double Ee=mass/2;
+ double Pe=TMath::Sqrt((Ee+0.000511)*(Ee-0.000511));
+
+ double costheta = (2.0 * gRandom->Rndm()) - 1.;
+ double sintheta = TMath::Sqrt((1. + costheta) * (1. - costheta));
+ double phi = 2.0 * TMath::ACos(-1.) * gRandom->Rndm();
+ double sinphi = TMath::Sin(phi);
+ double cosphi = TMath::Cos(phi);
+
+ // momentum vectors of leptons in virtual photon rest frame
+ Double_t pProd1[3] = {Pe * sintheta * cosphi,
+ Pe * sintheta * sinphi,
+ Pe * costheta};
+
+ Double_t pProd2[3] = {-1.0 * Pe * sintheta * cosphi,
+ -1.0 * Pe * sintheta * sinphi,
+ -1.0 * Pe * costheta};
+
+ // lepton 4-vectors in properly rotated virtual photon rest frame
+ Double_t pRot1[3] = {0.};
+ RotateVector(pProd1, pRot1, costheta, -sintheta, -cosphi, -sinphi);
+ Double_t pRot2[3] = {0.};
+ RotateVector(pProd2, pRot2, costheta, -sintheta, -cosphi, -sinphi);
+
+ TLorentzVector e1V4(pRot1[0],pRot1[1],pRot1[2],Ee);
+ TLorentzVector e2V4(pRot2[0],pRot2[1],pRot2[2],Ee);
+
+ TVector3 boost(gamma->Px(),gamma->Py(),gamma->Pz());
+ boost*=1/sqrt(gamma->P()*gamma->P()+mass*mass);
+ e1V4.Boost(boost);
+ e2V4.Boost(boost);
+
+ TLorentzVector vtx;
+ gamma->ProductionVertex(vtx);
+ new((*particles)[nPartNew]) TParticle(11, gamma->GetStatusCode(), iPart+1, -1, 0, 0, e1V4, vtx);
+ nPartNew++;
+ new((*particles)[nPartNew]) TParticle(-11, gamma->GetStatusCode(), iPart+1, -1, 0, 0, e2V4, vtx);
+ nPartNew++;
+ }
}
Int_t AliGenParam::ForceGammaConversion(TClonesArray *particles, Int_t nPart)
{
//based on: http://geant4.cern.ch/G4UsersDocuments/UsersGuides/PhysicsReferenceManual/html/node27.html
// and: http://geant4.cern.ch/G4UsersDocuments/UsersGuides/PhysicsReferenceManual/html/node58.html
+ // and: G4LivermoreGammaConversionModel.cc
Int_t nPartNew=nPart;
for(int iPart=0; iPart<nPart; iPart++){
TParticle *gamma = (TParticle *) particles->At(iPart);
if(gamma->GetPdgCode()!=22) continue;
+ if(gamma->Energy()<0.001022) continue;
TVector3 gammaV3(gamma->Px(),gamma->Py(),gamma->Pz());
- Float_t az=fRandom->Uniform(TMath::Pi()*2);
- double frac=EnergyFraction(1,gamma->Energy());
+ double frac=RandomEnergyFraction(1,gamma->Energy());
double Ee1=frac*gamma->Energy();
double Ee2=(1-frac)*gamma->Energy();
- double Pe1=Ee1;//sqrt(Ee1*Ee1-0.000511*0.000511);
- double Pe2=Ee2;//sqrt(Ee2*Ee2-0.000511*0.000511);
+ double Pe1=sqrt((Ee1+0.000511)*(Ee1-0.000511));
+ double Pe2=sqrt((Ee2+0.000511)*(Ee2-0.000511));
TVector3 rotAxis(OrthogonalVector(gammaV3));
+ Float_t az=fRandom->Uniform(TMath::Pi()*2);
rotAxis.Rotate(az,gammaV3);
TVector3 e1V3(gammaV3);
- e1V3.Rotate(PolarAngle(Ee1),rotAxis);
+ double u=RandomPolarAngle();
+ e1V3.Rotate(u/Ee1,rotAxis);
e1V3=e1V3.Unit();
e1V3*=Pe1;
TVector3 e2V3(gammaV3);
- e2V3.Rotate(-PolarAngle(Ee2),rotAxis);
+ e2V3.Rotate(-u/Ee2,rotAxis);
e2V3=e2V3.Unit();
e2V3*=Pe2;
// gamma = new TParticle(*gamma);
//
// particle type
Int_t iPart = fIpParaFunc(fRandom);
+ Int_t iTemp = iPart;
+
+ // custom pdg codes for to destinguish direct photons
+ if((iPart>=221000) && (iPart<=229000)) iPart=22;
+
fChildWeight=(fDecayer->GetPartialBranchingRatio(iPart))*fParentWeight;
TParticlePDG *particle = pDataBase->GetParticle(iPart);
Float_t am = particle->Mass();
//
// y
ty = TMath::TanH(fYPara->GetRandom());
+
//
// pT
if (fAnalog == kAnalog) {
p[0]=pt*TMath::Cos(phi);
p[1]=pt*TMath::Sin(phi);
p[2]=pl;
+
if(fVertexSmear==kPerTrack) {
Rndm(random,6);
for (j=0;j<3;j++) {
// select decay particles
Int_t np=fDecayer->ImportParticles(particles);
+ iPart=iTemp;
if(fForceConv) np=ForceGammaConversion(particles,np);
+ if(iPart==223000 || iPart==224000){
+ // wgtp*=IntegratedKrollWada(pt);
+ // wgtch*=IntegratedKrollWada(pt);
+ // np=VirtualGammaPairProduction(particles,np)
+ }
- // for(int iPart=0; iPart<np; iPart++){
- // TParticle *gamma = (TParticle *) particles->At(iPart);
- // printf("%i %i:", iPart, gamma->GetPdgCode());
- // printf("%i %i %i|",gamma->GetFirstMother(),gamma->GetFirstDaughter(),gamma->GetLastDaughter());
- // }
// Selecting GeometryAcceptance for particles fPdgCodeParticleforAcceptanceCut;
if (fGeometryAcceptance)
TF1 * GetY() {return fYPara;}
Float_t GetRelativeArea(Float_t ptMin, Float_t ptMax, Float_t yMin, Float_t yMax, Float_t phiMin, Float_t phiMax);
- static double ScreenVar(double Z, double e0, double eps){ return 136/pow(Z,0.333333)*e0/eps/(1-eps); }
- static double ScreenFunc1(double d);
- static double ScreenFunc2(double d);
- static double AuxScreenFunc1(double d, double Fz){ return 3*ScreenFunc1(d)-ScreenFunc2(d)-Fz; }
- static double AuxScreenFunc2(double d, double Fz){ return 3*0.5*ScreenFunc1(d)-0.5*ScreenFunc2(d)-Fz; }
static TVector3 OrthogonalVector(TVector3 &inVec);
- double EnergyFraction(double Z, double E);
- double PolarAngle(double E);
+ static void RotateVector(Double_t *pin, Double_t *pout, Double_t costheta, Double_t sintheta,
+ Double_t cosphi, Double_t sinphi);
+ static double IntegratedKrollWada(Double_t mh);
+ static double ScreenFunction1(double d);
+ static double ScreenFunction2(double d);
+ double RandomEnergyFraction(double Z, double E);
+ double RandomPolarAngle();
+ double RandomMass(Double_t mh);
+ Int_t VirtualGammaPairProduction(TClonesArray *particles, Int_t nPart);
Int_t ForceGammaConversion(TClonesArray *particles, Int_t nPart);
protected:
git://git.uio.no / u / mrichter / AliRoot.git / commitdiff