/*
$Log$
+Revision 1.37 2002/04/17 10:20:44 morsch
+Coding Rule violations corrected.
+
+Revision 1.36 2002/02/08 16:50:50 morsch
+Add name and title in constructor.
+
+Revision 1.35 2002/01/21 10:02:40 morsch
+ty is Double_t
+Abort if too high rapidity causes numerical paroblem. User has to specify
+meaningful y-range.
+
+Revision 1.34 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(..).
+
+Revision 1.33 2001/10/21 18:35:56 hristov
+Several pointers were set to zero in the default constructors to avoid memory management problems
+
+Revision 1.32 2001/07/27 17:09:36 morsch
+Use local SetTrack, KeepTrack and SetHighWaterMark methods
+to delegate either to local stack or to stack owned by AliRun.
+(Piotr Skowronski, A.M.)
+
Revision 1.31 2001/07/13 10:58:54 morsch
- Some coded moved to AliGenMC
- Improved handling of secondary vertices.
*/
+
+
+// Class to generate particles from using paramtrized pT and y distributions.
+// Distributions are obtained from pointer to object of type AliGenLib.
+// (For example AliGenMUONlib)
+// Decays are performed using Pythia.
+// andreas.morsch@cern.ch
+
#include "AliGenParam.h"
#include "AliDecayerPythia.h"
#include "AliGenMUONlib.h"
//
// Set random number generator
sRandom = fRandom;
+ fDecayer = 0;
+
+
}
AliGenParam::AliGenParam(Int_t npart, AliGenLib * Library, Int_t param, char* tname):AliGenMC(npart)
{
// Constructor using number of particles parameterisation id and library
+ fName = "Param";
+ fTitle= "Particle Generator using pT and y parameterisation";
fPtParaFunc = Library->GetPt(param, tname);
fYParaFunc = Library->GetY (param, tname);
AliGenParam::AliGenParam(Int_t npart, Int_t param, char* tname):AliGenMC(npart)
{
// Constructor using parameterisation id and number of particles
-//
+//
+ fName = "Param";
+ fTitle= "Particle Generator using pT and y parameterisation";
+
AliGenLib* pLibrary = new AliGenMUONlib();
fPtParaFunc = pLibrary->GetPt(param, tname);
{
// Constructor
// Gines Martinez 1/10/99
+ fName = "Param";
+ fTitle= "Particle Generator using pT and y parameterisation";
+
fPtParaFunc = PtPara;
fYParaFunc = YPara;
fIpParaFunc = IpPara;
}
-AliGenParam::AliGenParam(const AliGenParam & Paramd)
+AliGenParam::AliGenParam(const AliGenParam & Param)
{
// copy constructor
+ Param.Copy(*this);
}
//____________________________________________________________
Float_t phi, theta; // Phi and theta spherical angles of the parent particle momentum
Float_t p[3], pc[3],
och[3]; // Momentum, polarisation and origin of the children particles from lujet
- Float_t ty, xmt;
+ Double_t ty, xmt;
Int_t nt, i, j;
Float_t wgtp, wgtch;
Double_t dummy;
static TClonesArray *particles;
//
if(!particles) particles = new TClonesArray("TParticle",1000);
-
+
static TDatabasePDG *pDataBase = new TDatabasePDG();
if(!pDataBase) pDataBase = new TDatabasePDG();
//
fChildWeight=(fDecayer->GetPartialBranchingRatio(iPart))*fParentWeight;
TParticlePDG *particle = pDataBase->GetParticle(iPart);
Float_t am = particle->Mass();
-
+
Rndm(random,2);
//
// phi
phi=fPhiMin+random[0]*(fPhiMax-fPhiMin);
//
// y
- ty=Float_t(TMath::TanH(fYPara->GetRandom()));
+ ty = TMath::TanH(fYPara->GetRandom());
//
// pT
if (fAnalog == kAnalog) {
wgtch=fChildWeight*fPtParaFunc(& ptd, &dummy);
}
xmt=sqrt(pt*pt+am*am);
- if (TMath::Abs(ty)==1) ty=0;
+ if (TMath::Abs(ty)==1.) {
+ ty=0.;
+ Fatal("AliGenParam",
+ "Division by 0: Please check you rapidity range !");
+ }
+
pl=xmt*ty/sqrt(1.-ty*ty);
theta=TMath::ATan2(pt,pl);
// Cut on theta
//
// select decay particles
Int_t np=fDecayer->ImportParticles(particles);
+
+ // Selecting GeometryAcceptance for particles fPdgCodeParticleforAcceptanceCut;
+ if (fGeometryAcceptance)
+ if (!CheckAcceptanceGeometry(np,particles)) continue;
+
Int_t ncsel=0;
Int_t* pFlag = new Int_t[np];
Int_t* pParent = new Int_t[np];
// flagged particle
if (pFlag[i] == 1) {
- printf("\n deselected %d", i);
ipF = iparticle->GetFirstDaughter();
ipL = iparticle->GetLastDaughter();
if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1;
// flag decay products of particles with long life-time (c tau > .3 mum)
if (ks != 1) {
- TParticlePDG *particle = pDataBase->GetParticle(kf);
+// TParticlePDG *particle = pDataBase->GetParticle(kf);
Double_t lifeTime = fDecayer->GetLifetime(kf);
- Double_t mass = particle->Mass();
- Double_t width = particle->Width();
- printf("\n lifetime %d %e %e %e ", i, lifeTime, mass, width);
- if (lifeTime > (Double_t) 1.e-15) {
+// Double_t mass = particle->Mass();
+// Double_t width = particle->Width();
+ if (lifeTime > (Double_t) fMaxLifeTime) {
ipF = iparticle->GetFirstDaughter();
ipL = iparticle->GetLastDaughter();
if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1;
} // ks==1 ?
//
// children
+
if (ChildSelected(TMath::Abs(kf)) || fForceDecay == kAll && trackIt[i])
{
if (fCutOnChild) {
} else {
iparent = -1;
}
- printf("\n SetTrack %d %d %d %d", i, kf, iparent, trackIt[i]);
+
SetTrack(fTrackIt*trackIt[i], iparent, kf,
pc, och, polar,
0, kPDecay, nt, wgtch);
pParent[i] = nt;
KeepTrack(nt);
- }
- }
+ } // Selected
+ } // Particle loop
} // Decays by Lujet
-
+ particles->Clear();
if (pFlag) delete[] pFlag;
if (pParent) delete[] pParent;
if (pSelected) delete[] pSelected;
- if (trackIt) delete[] trackIt;
+ if (trackIt) delete[] trackIt;
} // kinematic selection
else // nodecay option, so parent will be tracked by GEANT (pions, kaons, eta, omegas, baryons)
{
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff