/*
$Log$
+Revision 1.16 2003/04/08 10:22:05 morsch
+Rapidity shift calculated in Init().
+
+Revision 1.15 2003/04/04 08:13:26 morsch
+Boost method added.
+
+Revision 1.14 2003/01/14 10:50:19 alibrary
+Cleanup of STEER coding conventions
+
+Revision 1.13 2002/10/14 14:55:35 hristov
+Merging the VirtualMC branch to the main development branch (HEAD)
+
+Revision 1.5.4.2 2002/07/24 08:56:28 alibrary
+Updating EVGEN on TVirtulaMC
+
+Revision 1.12 2002/07/19 11:42:33 morsch
+Use CalcMass()
+
+Revision 1.11 2002/06/06 15:26:24 morsch
+Correct child-selection for kPhiKK
+
+Revision 1.10 2002/06/05 14:05:46 morsch
+Decayer option kPhiKK for forced phi->K+K- decay added.
+
+Revision 1.9 2002/05/30 14:58:29 morsch
+Add pointer to AliGeometry to handle geometrical acceptance. (G. MArtinez)
+
+Revision 1.8 2002/04/26 10:42:35 morsch
+Case kNoDecayHeavy added. (N. Carrer)
+
+Revision 1.7 2002/04/17 10:32:32 morsch
+Coding Rule violations corrected.
+
+Revision 1.6 2002/03/26 14:19:36 morsch
+Saver calculation of rapdity.
+
+Revision 1.5 2002/03/12 17:02:20 morsch
+Change in calculation of rapidity, include case in which numerically e == pz.
+
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(..).
*/
-#include "AliGenMC.h"
-#include "AliPDG.h"
+// 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
+
+#include <TMath.h>
+#include <TPDGCode.h>
#include <TParticle.h>
+#include "AliGenMC.h"
+
ClassImp(AliGenMC)
AliGenMC::AliGenMC()
SetChildThetaRange();
SetChildYRange();
SetMaximumLifetime();
+ SetGeometryAcceptance();
+ SetPdgCodeParticleforAcceptanceCut();
+ SetNumberOfAcceptedParticles();
+ SetTarget();
+ SetProjectile();
}
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();
}
AliGenMC::AliGenMC(const AliGenMC & mc)
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 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 = 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;
}
}
-
-
return kTRUE;
}
-Int_t AliGenMC::CheckPDGCode(Int_t pdgcode)
+Bool_t AliGenMC::CheckAcceptanceGeometry(Int_t np, TClonesArray* particles)
+{
+ Bool_t Check ; // All fPdgCodeParticleforAcceptanceCut particles are in in the fGeometryAcceptance acceptance
+ 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;
}
+
+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)
{
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff