* provided "as is" without express or implied warranty. *
**************************************************************************/
-/*
-$Log$
-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
+/* $Id$ */
-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.
-
-Revision 1.30 2001/06/15 07:55:04 morsch
-Put only first generation decay products on the stack.
-
-Revision 1.29 2001/03/27 10:58:41 morsch
-Initialize decayer before generation. Important if run inside cocktail.
-
-Revision 1.28 2001/03/09 13:01:41 morsch
-- enum constants for paramterisation type (particle family) moved to AliGen*lib.h
-- use AliGenGSIlib::kUpsilon, AliGenPHOSlib::kEtaPrime to access the constants
-
-Revision 1.27 2001/02/02 15:21:10 morsch
-Set high water mark after last particle.
-Use Vertex() method for Vertex.
-
-Revision 1.26 2000/12/21 16:24:06 morsch
-Coding convention clean-up
-
-Revision 1.25 2000/11/30 07:12:50 alibrary
-Introducing new Rndm and QA classes
-
-Revision 1.24 2000/10/18 19:11:27 hristov
-Division by zero fixed
-
-Revision 1.23 2000/10/02 21:28:06 fca
-Removal of useless dependecies via forward declarations
-
-Revision 1.22 2000/09/12 14:14:55 morsch
-Call fDecayer->ForceDecay() at the beginning of Generate().
-
-Revision 1.21 2000/09/08 15:39:01 morsch
-Handle the case fForceDecay=all during the generation, i.e. select all secondaries.
-
-Revision 1.20 2000/09/06 14:35:44 morsch
-Use AliDecayerPythia for particle decays.
-
-Revision 1.19 2000/07/11 18:24:56 fca
-Coding convention corrections + few minor bug fixes
-
-Revision 1.18 2000/06/29 21:08:27 morsch
-All paramatrisation libraries derive from the pure virtual base class AliGenLib.
-This allows to pass a pointer to a library directly to AliGenParam and avoids the
-use of function pointers in Config.C.
-
-Revision 1.17 2000/06/09 20:33:30 morsch
-All coding rule violations except RS3 corrected
-
-Revision 1.16 2000/05/02 07:51:31 morsch
-- Control precision of pT sampling TF1::SetNpx(..)
-- Correct initialisation of child-cuts in all constructors.
-- Most coding rule violations corrected.
-
-Revision 1.15 2000/04/03 15:42:12 morsch
-Cuts on primary particles are separated from those on the decay products. Methods
-SetChildMomentumRange, SetChildPtRange, SetChildPhiRange, SetChildThetaRange added.
-
-Revision 1.14 1999/11/09 07:38:48 fca
-Changes for compatibility with version 2.23 of ROOT
-
-Revision 1.13 1999/11/04 11:30:31 fca
-Correct the logics for SetForceDecay
-
-Revision 1.12 1999/11/03 17:43:20 fca
-New version from G.Martinez & A.Morsch
-
-Revision 1.11 1999/09/29 09:24:14 fca
-Introduction of the Copyright and cvs Log
-
-*/
+// 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 "AliDecayer.h"
#include "AliGenMUONlib.h"
#include "AliRun.h"
#include <TParticle.h>
#include <TLorentzVector.h>
#include <TF1.h>
+#include <TCanvas.h>
+#include <TH1.h>
ClassImp(AliGenParam)
fParam = 0;
fAnalog = kAnalog;
SetDeltaPt();
-//
-// 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);
fAnalog = kAnalog;
SetForceDecay();
SetDeltaPt();
-//
-// Set random number generator
- sRandom = fRandom;
}
//____________________________________________________________
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);
}
//____________________________________________________________
{
// Initialisation
- fDecayer = new AliDecayerPythia();
+ if (gMC) fDecayer = gMC->GetDecayer();
//Begin_Html
/*
<img src="picts/AliGenParam.gif">
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();
+
+ TDatabasePDG *pDataBase = TDatabasePDG::Instance();
//
Float_t random[6];
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];
// 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();
+// Double_t mass = particle->Mass();
+// Double_t width = particle->Width();
if (lifeTime > (Double_t) fMaxLifeTime) {
ipF = iparticle->GetFirstDaughter();
ipL = iparticle->GetLastDaughter();
} else {
iparent = -1;
}
+
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)
{
SetHighWaterMark(nt);
}
+void AliGenParam::Draw()
+{
+ //
+ // Draw the pT and y Distributions
+ //
+ TCanvas *c0 = new TCanvas("c0","Canvas 0",400,10,600,700);
+ c0->Divide(2,1);
+ c0->cd(1);
+ fPtPara->Draw();
+ fPtPara->GetHistogram()->SetXTitle("p_{T} (GeV)");
+ c0->cd(2);
+ fYPara->Draw();
+ fYPara->GetHistogram()->SetXTitle("y");
+}
+
AliGenParam& AliGenParam::operator=(const AliGenParam& rhs)
{
// Assignment operator
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff