* provided "as is" without express or implied warranty. *
**************************************************************************/
-/*
-$Log$
-Revision 1.3 2001/10/16 08:48:56 morsch
-Common vertex related code moved to base class AliGenerator.
+/* $Id$ */
-Revision 1.2 2001/10/15 08:15:51 morsch
-Event vertex and vertex truncation setting moved into AliMC.
+// 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 1.1 2001/07/13 10:56:00 morsch
-AliGenMC base class for AliGenParam and AliGenPythia commonalities.
-
-*/
+#include <TClonesArray.h>
+#include <TMath.h>
+#include <TPDGCode.h>
+#include <TParticle.h>
+#include <TLorentzVector.h>
+#include <TVector3.h>
#include "AliGenMC.h"
-#include "AliPDG.h"
-#include <TParticle.h>
+#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()
//
// 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 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 phi = Float_t(TMath::ATan2(Double_t(py),Double_t(px)));
- Float_t y;
+ 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-pz)<=0 || (e+pz)<=0 ) {
- return kFALSE;
+ if (e == 0.)
+ e = TMath::Sqrt(p * p + mass * mass);
+
+
+ Double_t y, y0;
+
+ if (TMath::Abs(pz) < e) {
+ y = 0.5*TMath::Log((e+pz)/(e-pz));
} else {
- y = 0.5*TMath::Log((e+pz)/(e-pz));
+ y = 1.e10;
+ }
+
+ if (mt2) {
+ y0 = 0.5*TMath::Log((e+TMath::Abs(pz))*(e+TMath::Abs(pz))/mt2);
+ } else {
+ if (TMath::Abs(y) < 1.e10) {
+ y0 = y;
+ } else {
+ y0 = 1.e10;
+ }
}
+
+ y = (pz < 0) ? -y0 : y0;
if (flag == 0) {
//
}
}
-
-
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
//non diffractive state -- return code unchanged
return pdgcode;
}
-
-AliGenMC& AliGenMC::operator=(const AliGenMC& rhs)
+
+void AliGenMC::Boost()
{
-// Assignment operator
- return *this;
+//
+// 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()
+{
+ // 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);
+ }
+}
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff