X-Git-Url: http://git.uio.no/git/?a=blobdiff_plain;f=EVGEN%2FAliGenMC.cxx;h=287ffcbda478a025cea6fe99bd49af6ecc1cf926;hb=d41a82acbec38799a7e16bf413a64baef52d2695;hp=34b1e2e97e2559857588cdc85650b50dc3a86551;hpb=95450c6d20e9ae7e3fc1d016a5eb658fb0872aba;p=u%2Fmrichter%2FAliRoot.git diff --git a/EVGEN/AliGenMC.cxx b/EVGEN/AliGenMC.cxx index 34b1e2e97e2..287ffcbda47 100644 --- a/EVGEN/AliGenMC.cxx +++ b/EVGEN/AliGenMC.cxx @@ -13,31 +13,24 @@ * 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 "AliGenMC.h" -#include "AliPDG.h" -#include - ClassImp(AliGenMC) +ClassImp(AliGenMC) AliGenMC::AliGenMC() - :AliGenerator() + :AliGenerator() { // Default Constructor SetCutOnChild(); @@ -47,10 +40,18 @@ AliGenMC::AliGenMC() SetChildThetaRange(); SetChildYRange(); SetMaximumLifetime(); + SetGeometryAcceptance(); + SetPdgCodeParticleforAcceptanceCut(); + SetNumberOfAcceptedParticles(); + SetTarget(); + SetProjectile(); + fParentSelect.Set(8); + fChildSelect.Set(8); + fForceDecay = kAll; } AliGenMC::AliGenMC(Int_t npart) - :AliGenerator(npart) + :AliGenerator(npart) { // Constructor SetCutOnChild(); @@ -64,11 +65,19 @@ AliGenMC::AliGenMC(Int_t npart) fChildSelect.Set(8); for (Int_t i=0; i<8; i++) fParentSelect[i]=fChildSelect[i]=0; SetMaximumLifetime(); + SetGeometryAcceptance(); + SetPdgCodeParticleforAcceptanceCut(); + SetNumberOfAcceptedParticles(); + SetTarget(); + SetProjectile(); + fForceDecay = kAll; } -AliGenMC::AliGenMC(const AliGenMC & mc) +AliGenMC::AliGenMC(const AliGenMC & mc): + AliGenerator(mc) { -// copy constructor +// Copy constructor + mc.Copy(*this); } AliGenMC::~AliGenMC() @@ -87,6 +96,7 @@ void AliGenMC::Init() case kBPsiPrimeDiElectron: fChildSelect[0] = kElectron; break; + case kHardMuons: case kSemiMuonic: case kDiMuon: case kBJpsiDiMuon: @@ -99,50 +109,58 @@ void AliGenMC::Init() fChildSelect[0]=kPiPlus; fChildSelect[1]=kKPlus; break; + case kPhiKK: + fChildSelect[0]=kKPlus; + case kOmega: case kAll: case kNoDecay: + case kNoDecayHeavy: 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(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 mass = particle->GetCalcMass(); Float_t mt2 = pt * pt + mass * mass; + Float_t phi = particle->Phi(); - 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 +246,34 @@ 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 +305,52 @@ Int_t AliGenMC::CheckPDGCode(Int_t pdgcode) //non diffractive state -- return code unchanged return pdgcode; } + +void AliGenMC::Boost() +{ +// +// Boost cms into LHC lab frame +// + + Double_t beta = TMath::TanH(fDyBoost); + Double_t gamma = 1./TMath::Sqrt(1.-beta*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); + } +} + + AliGenMC& AliGenMC::operator=(const AliGenMC& rhs) { // Assignment operator + rhs.Copy(*this); return *this; } +void AliGenMC::Copy(TObject&) const +{ + // + // Copy + // + Fatal("Copy","Not implemented!\n"); +} + +