X-Git-Url: http://git.uio.no/git/?p=u%2Fmrichter%2FAliRoot.git;a=blobdiff_plain;f=EVGEN%2FAliGenMC.cxx;h=c7f1b954292223709da93f7aff5888dc217c07fb;hp=34b1e2e97e2559857588cdc85650b50dc3a86551;hb=cbd58b9ca6f605fd8df95cbeb1726a7e90dd23ae;hpb=95450c6d20e9ae7e3fc1d016a5eb658fb0872aba diff --git a/EVGEN/AliGenMC.cxx b/EVGEN/AliGenMC.cxx index 34b1e2e97e2..c7f1b954292 100644 --- a/EVGEN/AliGenMC.cxx +++ b/EVGEN/AliGenMC.cxx @@ -13,62 +13,99 @@ * provided "as is" without express or implied warranty. * **************************************************************************/ -/* -$Log$ -Revision 1.4 2001/11/27 13:13:07 morsch -Maximum lifetime for long-lived particles to be put on the stack is parameter. -It can be set via SetMaximumLifetime(..). +/* $Id$ */ -Revision 1.3 2001/10/16 08:48:56 morsch -Common vertex related code moved to base class AliGenerator. +// Base class for generators using external MC generators. +// For example AliGenPythia using Pythia. +// Provides basic functionality: setting of kinematic cuts on +// decay products and particle selection. +// andreas.morsch@cern.ch -Revision 1.2 2001/10/15 08:15:51 morsch -Event vertex and vertex truncation setting moved into AliMC. - -Revision 1.1 2001/07/13 10:56:00 morsch -AliGenMC base class for AliGenParam and AliGenPythia commonalities. - -*/ +#include +#include +#include +#include +#include +#include #include "AliGenMC.h" -#include "AliPDG.h" -#include +#include "AliGenEventHeader.h" +#include "AliRun.h" +#include "AliGeometry.h" +#include "AliDecayer.h" - ClassImp(AliGenMC) +ClassImp(AliGenMC) AliGenMC::AliGenMC() - :AliGenerator() + :AliGenerator(), + fParticles("TParticle", 1000), + fParentSelect(8), + fChildSelect(8), + fCutOnChild(0), + fChildPtMin(0.), + fChildPtMax(1.e10), + fChildPMin(0.), + fChildPMax(1.e10), + fChildPhiMin(0.), + fChildPhiMax(2. * TMath::Pi()), + fChildThetaMin(0.), + fChildThetaMax(TMath::Pi()), + fChildYMin(-12.), + fChildYMax(12.), + fXingAngleX(0.), + fXingAngleY(0.), + fForceDecay(kAll), + fMaxLifeTime(1.e-15), + fDyBoost(0.), + fGeometryAcceptance(0), + fPdgCodeParticleforAcceptanceCut(0), + fNumberOfAcceptedParticles(0), + fNprimaries(0) { // Default Constructor - SetCutOnChild(); - SetChildMomentumRange(); - SetChildPtRange(); - SetChildPhiRange(); - SetChildThetaRange(); - SetChildYRange(); - SetMaximumLifetime(); + fAProjectile = 1; + fZProjectile = 1; + fATarget = 1; + fZTarget = 1; + fProjectile = "P"; + fTarget = "P"; } AliGenMC::AliGenMC(Int_t npart) - :AliGenerator(npart) + :AliGenerator(npart), + fParticles("TParticle", 1000), + fParentSelect(8), + fChildSelect(8), + fCutOnChild(0), + fChildPtMin(0.), + fChildPtMax(1.e10), + fChildPMin(0.), + fChildPMax(1.e10), + fChildPhiMin(0.), + fChildPhiMax(2. * TMath::Pi()), + fChildThetaMin(0.), + fChildThetaMax(TMath::Pi()), + fChildYMin(-12.), + fChildYMax(12.), + fXingAngleX(0.), + fXingAngleY(0.), + fForceDecay(kAll), + fMaxLifeTime(1.e-15), + fDyBoost(0.), + fGeometryAcceptance(0), + fPdgCodeParticleforAcceptanceCut(0), + fNumberOfAcceptedParticles(0), + fNprimaries(0) { // Constructor - SetCutOnChild(); - SetChildMomentumRange(); - SetChildPtRange(); - SetChildPhiRange(); - SetChildThetaRange(); - SetChildYRange(); // - fParentSelect.Set(8); - fChildSelect.Set(8); - for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0; - SetMaximumLifetime(); -} - -AliGenMC::AliGenMC(const AliGenMC & mc) -{ -// copy constructor + fAProjectile = 1; + fZProjectile = 1; + fATarget = 1; + fZTarget = 1; + fProjectile = "P"; + fTarget = "P"; + for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0; } AliGenMC::~AliGenMC() @@ -81,68 +118,122 @@ void AliGenMC::Init() // // Initialization switch (fForceDecay) { + case kBSemiElectronic: case kSemiElectronic: case kDiElectron: case kBJpsiDiElectron: case kBPsiPrimeDiElectron: + case kElectronEM: + case kDiElectronEM: fChildSelect[0] = kElectron; break; + case kHardMuons: + case kBSemiMuonic: + case kDSemiMuonic: case kSemiMuonic: case kDiMuon: + case kJpsiDiMuon: case kBJpsiDiMuon: case kBPsiPrimeDiMuon: case kPiToMu: case kKaToMu: + case kWToMuon: + case kWToCharmToMuon: + case kZDiMuon: + case kZDiElectron: fChildSelect[0]=kMuonMinus; break; + case kWToCharm: + break; case kHadronicD: + case kHadronicDWithout4Bodies: fChildSelect[0]=kPiPlus; fChildSelect[1]=kKPlus; break; + case kPhiKK: + fChildSelect[0]=kKPlus; + break; + case kBJpsi: + case kBJpsiUndecayed: + fChildSelect[0]= 443; + break; + case kChiToJpsiGammaToMuonMuon: + fChildSelect[0]= 22; + fChildSelect[1]= 13; + break; + case kChiToJpsiGammaToElectronElectron: + fChildSelect[0]= 22; + fChildSelect[1]= 11; + break; + case kLambda: + fChildSelect[0]= kProton; + fChildSelect[1]= 211; + break; + case kPsiPrimeJpsiDiElectron: + fChildSelect[0]= 211; + fChildSelect[1]= 11; + break; + case kGammaEM: + fChildSelect[0] = kGamma; + break; + case kOmega: case kAll: + case kAllMuonic: case kNoDecay: + case kNoDecayHeavy: + case kNoDecayBeauty: + case kNeutralPion: + case kBeautyUpgrade: break; } + + if (fZTarget != 0 && fAProjectile != 0) + { + fDyBoost = - 0.5 * TMath::Log(Double_t(fZProjectile) * Double_t(fATarget) / + (Double_t(fZTarget) * Double_t(fAProjectile))); + } } -Bool_t AliGenMC::ParentSelected(Int_t ip) +Bool_t AliGenMC::ParentSelected(Int_t ip) const { // True if particle is in list of parent particles to be selected for (Int_t i=0; i<8; i++) { - if (fParentSelect[i]==ip) return kTRUE; + if (fParentSelect.At(i) == ip) return kTRUE; } return kFALSE; } -Bool_t AliGenMC::ChildSelected(Int_t ip) +Bool_t AliGenMC::ChildSelected(Int_t ip) const { // True if particle is in list of decay products to be selected for (Int_t i=0; i<5; i++) { - if (fChildSelect[i]==ip) return kTRUE; + if (fChildSelect.At(i) == ip) return kTRUE; } return kFALSE; } -Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) +Bool_t AliGenMC::KinematicSelection(const TParticle *particle, Int_t flag) const { // Perform kinematic selection - Float_t px = particle->Px(); - Float_t py = particle->Py(); - Float_t pz = particle->Pz(); - Float_t e = particle->Energy(); - Float_t pt = particle->Pt(); - Float_t p = particle->P(); - Float_t theta = particle->Theta(); - Float_t mass = particle->GetMass(); - Float_t mt2 = pt * pt + mass * mass; + Double_t pz = particle->Pz(); + Double_t pt = particle->Pt(); + Double_t p = particle->P(); + Double_t theta = particle->Theta(); + Double_t mass = particle->GetCalcMass(); + Double_t mt2 = pt * pt + mass * mass; + Double_t phi = particle->Phi(); + Double_t e = particle->Energy(); + + if (e == 0.) + e = TMath::Sqrt(p * p + mass * mass); + - Float_t phi = Float_t(TMath::ATan2(Double_t(py),Double_t(px))); Double_t y, y0; - if (TMath::Abs(pz) != e) { + if (TMath::Abs(pz) < e) { y = 0.5*TMath::Log((e+pz)/(e-pz)); } else { y = 1.e10; @@ -228,12 +319,34 @@ Bool_t AliGenMC::KinematicSelection(TParticle *particle, Int_t flag) } } - - return kTRUE; } -Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) +Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles) +{ +// Check the geometrical acceptance for particle. + + Bool_t check ; + Int_t numberOfPdgCodeParticleforAcceptanceCut = 0; + Int_t numberOfAcceptedPdgCodeParticleforAcceptanceCut = 0; + TParticle * particle; + Int_t i; + for (i = 0; i < np; i++) { + particle = (TParticle *) particles->At(i); + if( TMath::Abs( particle->GetPdgCode() ) == TMath::Abs( fPdgCodeParticleforAcceptanceCut ) ) { + numberOfPdgCodeParticleforAcceptanceCut++; + if (fGeometryAcceptance->Impact(particle)) numberOfAcceptedPdgCodeParticleforAcceptanceCut++; + } + } + if ( numberOfAcceptedPdgCodeParticleforAcceptanceCut > (fNumberOfAcceptedParticles-1) ) + check = kTRUE; + else + check = kFALSE; + + return check; +} + +Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) const { // // If the particle is in a diffractive state, then take action accordingly @@ -265,10 +378,84 @@ Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) //non diffractive state -- return code unchanged return pdgcode; } - -AliGenMC& AliGenMC::operator=(const AliGenMC& rhs) + +void AliGenMC::Boost() +{ +// +// Boost cms into LHC lab frame +// + + Double_t beta = TMath::TanH(fDyBoost); + Double_t gamma = 1./TMath::Sqrt((1.-beta)*(1.+beta)); + Double_t gb = gamma * beta; + + // printf("\n Boosting particles to lab frame %f %f %f", fDyBoost, beta, gamma); + + Int_t i; + Int_t np = fParticles.GetEntriesFast(); + for (i = 0; i < np; i++) + { + TParticle* iparticle = (TParticle*) fParticles.At(i); + + Double_t e = iparticle->Energy(); + Double_t px = iparticle->Px(); + Double_t py = iparticle->Py(); + Double_t pz = iparticle->Pz(); + + Double_t eb = gamma * e - gb * pz; + Double_t pzb = -gb * e + gamma * pz; + + iparticle->SetMomentum(px, py, pzb, eb); + } +} + +void AliGenMC::BeamCrossAngle() { -// Assignment operator - return *this; + // Applies a boost in the y-direction in order to take into account the + // beam crossing angle + + Double_t thetaPr0, phiPr0, pyPr2, pzPr2; + TVector3 beta; + + thetaPr0 = fXingAngleY / 2.; + phiPr0 = 0; + + // Momentum of the CMS system + pyPr2 = TMath::Sqrt(fEnergyCMS * fEnergyCMS/ 4 - 0.938 * 0.938) * TMath::Sin(thetaPr0); + pzPr2 = TMath::Sqrt(fEnergyCMS * fEnergyCMS/ 4 - 0.938 * 0.938) * TMath::Cos(thetaPr0); + + TLorentzVector proj1Vect, proj2Vect, projVect; + proj1Vect.SetPxPyPzE(0., pyPr2, pzPr2, fEnergyCMS/2); + proj2Vect.SetPxPyPzE(0., pyPr2,-pzPr2, fEnergyCMS/2); + projVect = proj1Vect + proj2Vect; + beta=(1. / projVect.E()) * (projVect.Vect()); + + Int_t i; + Int_t np = fParticles.GetEntriesFast(); + for (i = 0; i < np; i++) + { + TParticle* iparticle = (TParticle*) fParticles.At(i); + + Double_t e = iparticle->Energy(); + Double_t px = iparticle->Px(); + Double_t py = iparticle->Py(); + Double_t pz = iparticle->Pz(); + + TLorentzVector partIn; + partIn.SetPxPyPzE(px,py,pz,e); + partIn.Boost(beta); + iparticle->SetMomentum(partIn.Px(),partIn.Py(),partIn.Pz(),partIn.E()); + } } + +void AliGenMC::AddHeader(AliGenEventHeader* header) +{ + // Passes header either to the container or to gAlice + if (fContainer) { + header->SetName(fName); + fContainer->AddHeader(header); + } else { + gAlice->SetGenEventHeader(header); + } +}