/*
$Log$
+Revision 1.42 2003/03/15 19:48:01 morsch
+AliDecayerPythia replaced by AliDecayer
+
+Revision 1.41 2003/01/09 17:38:47 morsch
+Draw() method added.
+
+Revision 1.40 2002/10/14 14:55:35 hristov
+Merging the VirtualMC branch to the main development branch (HEAD)
+
+Revision 1.36.6.3 2002/10/10 16:40:08 hristov
+Updating VirtualMC to v3-09-02
+
+Revision 1.39 2002/09/16 08:21:16 morsch
+Use TDatabasePDG::Instance();
+
+Revision 1.38 2002/05/30 14:59:12 morsch
+Check geometrical acceptance. (G. Martinez)
+
+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.
+
+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.
*/
+
+
+// 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 "AliPythia.h"
#include <TParticle.h>
#include <TParticlePDG.h>
#include <TDatabasePDG.h>
#include <TLorentzVector.h>
#include <TF1.h>
+#include <TCanvas.h>
+#include <TH1.h>
ClassImp(AliGenParam)
//____________________________________________________________
//____________________________________________________________
AliGenParam::AliGenParam()
- :AliGenerator()
{
// Deafault constructor
fPtPara = 0;
fYPara = 0;
- fParam = jpsi_p;
- fAnalog = analog;
- SetCutOnChild();
- SetChildMomentumRange();
- SetChildPtRange();
- SetChildPhiRange();
- SetChildThetaRange();
+ fParam = 0;
+ fAnalog = kAnalog;
SetDeltaPt();
+ fDecayer = 0;
+
+
}
-AliGenParam::AliGenParam(Int_t npart, AliGenLib * Library, Param_t param, char* tname):AliGenerator(npart)
+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);
fPtPara = 0;
fYPara = 0;
fParam = param;
- fAnalog = analog;
- fChildSelect.Set(5);
- for (Int_t i=0; i<5; i++) fChildSelect[i]=0;
+ fAnalog = kAnalog;
SetForceDecay();
- SetCutOnChild();
- SetChildMomentumRange();
- SetChildPtRange();
- SetChildPhiRange();
- SetChildThetaRange();
SetDeltaPt();
}
//____________________________________________________________
-AliGenParam::AliGenParam(Int_t npart, Param_t param, char* tname):AliGenerator(npart)
+AliGenParam::AliGenParam(Int_t npart, Int_t param, char* tname):AliGenMC(npart)
{
// Constructor using parameterisation id and number of particles
-//
- AliGenLib* Library = new AliGenMUONlib();
+//
+ fName = "Param";
+ fTitle= "Particle Generator using pT and y parameterisation";
+
+ AliGenLib* pLibrary = new AliGenMUONlib();
- fPtParaFunc = Library->GetPt(param, tname);
- fYParaFunc = Library->GetY (param, tname);
- fIpParaFunc = Library->GetIp(param, tname);
+ fPtParaFunc = pLibrary->GetPt(param, tname);
+ fYParaFunc = pLibrary->GetY (param, tname);
+ fIpParaFunc = pLibrary->GetIp(param, tname);
fPtPara = 0;
fYPara = 0;
fParam = param;
- fAnalog = analog;
+ fAnalog = kAnalog;
fChildSelect.Set(5);
for (Int_t i=0; i<5; i++) fChildSelect[i]=0;
SetForceDecay();
SetDeltaPt();
}
-AliGenParam::AliGenParam(Int_t npart, Param_t param,
+AliGenParam::AliGenParam(Int_t npart, Int_t param,
Double_t (*PtPara) (Double_t*, Double_t*),
Double_t (*YPara ) (Double_t* ,Double_t*),
- Int_t (*IpPara) ())
- :AliGenerator(npart)
+ Int_t (*IpPara) (TRandom *))
+ :AliGenMC(npart)
{
// Constructor
// Gines Martinez 1/10/99
+ fName = "Param";
+ fTitle= "Particle Generator using pT and y parameterisation";
+
fPtParaFunc = PtPara;
fYParaFunc = YPara;
fIpParaFunc = IpPara;
fPtPara = 0;
fYPara = 0;
fParam = param;
- fAnalog = analog;
+ fAnalog = kAnalog;
fChildSelect.Set(5);
for (Int_t i=0; i<5; i++) fChildSelect[i]=0;
SetForceDecay();
}
-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 intPt0 = ptPara->Integral(0,15);
Float_t intPtS = ptPara->Integral(fPtMin,fPtMax);
Float_t phiWgt=(fPhiMax-fPhiMin)/2./TMath::Pi();
- if (fAnalog == analog) {
+ if (fAnalog == kAnalog) {
fYWgt = intYS/fdNdy0;
fPtWgt = intPtS/intPt0;
fParentWeight = fYWgt*fPtWgt*phiWgt/fNpart;
}
//
// particle decay related initialization
+ fDecayer->SetForceDecay(fForceDecay);
fDecayer->Init();
-// semimuonic decays of charm and beauty
- fDecayer->ForceDecay(fForceDecay);
+
//
- switch (fForceDecay)
- {
- case semielectronic:
- case dielectron:
- case b_jpsi_dielectron:
- case b_psip_dielectron:
- fChildSelect[0]=11;
- break;
- case semimuonic:
- case dimuon:
- case b_jpsi_dimuon:
- case b_psip_dimuon:
- fChildSelect[0]=13;
- break;
- case pitomu:
- fChildSelect[0]=13;
- break;
- case katomu:
- fChildSelect[0]=13;
- break;
- case nodecay:
- break;
- case all:
- break;
- }
+ AliGenMC::Init();
}
//____________________________________________________________
// However, light mesons are directly tracked by GEANT
// setting fForceDecay = nodecay (SetForceDecay(nodecay))
//
-
-
+//
+// Reinitialize decayer
+ fDecayer->Init();
+//
Float_t polar[3]= {0,0,0}; // Polarisation of the parent particle (for GEANT tracking)
Float_t origin0[3]; // Origin of the generated parent particle (for GEANT tracking)
Float_t pt, pl, ptot; // Transverse, logitudinal and total momenta of the parent particle
Float_t phi, theta; // Phi and theta spherical angles of the parent particle momentum
Float_t p[3], pc[3],
- och[3], pch[10][3]; // Momentum, polarisation and origin of the children particles from lujet
- Float_t ty, xmt;
- Int_t nt, i, j, kfch[10];
+ och[3]; // Momentum, polarisation and origin of the children particles from lujet
+ 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 *DataBase = new TDatabasePDG();
- if(!DataBase) DataBase = new TDatabasePDG();
+ if(!particles) particles = new TClonesArray("TParticle",1000);
+
+ TDatabasePDG *pDataBase = TDatabasePDG::Instance();
//
Float_t random[6];
// Calculating vertex position per event
for (j=0;j<3;j++) origin0[j]=fOrigin[j];
if(fVertexSmear==kPerEvent) {
- gMC->Rndm(random,6);
- for (j=0;j<3;j++) {
- origin0[j]+=fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
- TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
- }
+ Vertex();
+ for (j=0;j<3;j++) origin0[j]=fVertex[j];
}
+
Int_t ipa=0;
+
// Generating fNpart particles
while (ipa<fNpart) {
while(1) {
//
// particle type
- Int_t iPart = fIpParaFunc();
+ Int_t iPart = fIpParaFunc(fRandom);
fChildWeight=(fDecayer->GetPartialBranchingRatio(iPart))*fParentWeight;
- TParticlePDG *particle = DataBase->GetParticle(iPart);
+ TParticlePDG *particle = pDataBase->GetParticle(iPart);
Float_t am = particle->Mass();
-
- gMC->Rndm(random,2);
+
+ 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 == analog) {
+ if (fAnalog == kAnalog) {
pt=fPtPara->GetRandom();
wgtp=fParentWeight;
wgtch=fChildWeight;
wgtch=fChildWeight*fPtParaFunc(& ptd, &dummy);
}
xmt=sqrt(pt*pt+am*am);
+ 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
ptot=TMath::Sqrt(pt*pt+pl*pl);
// Cut on momentum
if(ptot<fPMin || ptot>fPMax) continue;
+//
p[0]=pt*TMath::Cos(phi);
p[1]=pt*TMath::Sin(phi);
p[2]=pl;
if(fVertexSmear==kPerTrack) {
- gMC->Rndm(random,6);
+ Rndm(random,6);
for (j=0;j<3;j++) {
origin0[j]=
fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
// if fForceDecay == none Primary particle is tracked by GEANT
// (In the latest, make sure that GEANT actually does all the decays you want)
//
- if (fForceDecay != nodecay) {
+
+ if (fForceDecay != kNoDecay) {
// Using lujet to decay particle
Float_t energy=TMath::Sqrt(ptot*ptot+am*am);
TLorentzVector pmom(p[0], p[1], p[2], energy);
//
// 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;
- for (i = 1; i<np; i++) {
- TParticle * iparticle = (TParticle *) particles->At(i);
- Int_t kf = iparticle->GetPdgCode();
+ Int_t* pFlag = new Int_t[np];
+ Int_t* pParent = new Int_t[np];
+ Int_t* pSelected = new Int_t[np];
+ Int_t* trackIt = new Int_t[np];
+
+ for (i=0; i<np; i++) {
+ pFlag[i] = 0;
+ pSelected[i] = 0;
+ pParent[i] = -1;
+ }
+
+ if (np >1) {
+ TParticle* iparticle = (TParticle *) particles->At(0);
+ Int_t ipF, ipL;
+ for (i = 1; i<np ; i++) {
+ trackIt[i] = 1;
+ iparticle = (TParticle *) particles->At(i);
+ Int_t kf = iparticle->GetPdgCode();
+ Int_t ks = iparticle->GetStatusCode();
+// flagged particle
+
+ if (pFlag[i] == 1) {
+ ipF = iparticle->GetFirstDaughter();
+ ipL = iparticle->GetLastDaughter();
+ if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1;
+ continue;
+ }
+
+// flag decay products of particles with long life-time (c tau > .3 mum)
+
+ if (ks != 1) {
+// TParticlePDG *particle = pDataBase->GetParticle(kf);
+
+ Double_t lifeTime = fDecayer->GetLifetime(kf);
+// 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;
+ } else{
+ trackIt[i] = 0;
+ pSelected[i] = 1;
+ }
+ } // ks==1 ?
//
// children
- if (ChildSelected(TMath::Abs(kf)) || fForceDecay==all)
- {
- pc[0]=iparticle->Px();
- pc[1]=iparticle->Py();
- pc[2]=iparticle->Pz();
- och[0]=origin0[0]+iparticle->Vx()/10;
- och[1]=origin0[1]+iparticle->Vy()/10;
- och[2]=origin0[2]+iparticle->Vz()/10;
- if (fCutOnChild) {
- Float_t ptChild=TMath::Sqrt(pc[0]*pc[0]+pc[1]*pc[1]);
- Float_t pChild=TMath::Sqrt(ptChild*ptChild+pc[2]*pc[2]);
- Float_t thetaChild=TMath::ATan2(ptChild,pc[2]);
- Float_t phiChild=TMath::ATan2(pc[1],pc[0]);
- Bool_t childok =
- ((ptChild > fChildPtMin && ptChild <fChildPtMax) &&
- (pChild > fChildPMin && pChild <fChildPMax) &&
- (thetaChild > fChildThetaMin && thetaChild <fChildThetaMax) &&
- (phiChild > fChildPhiMin && phiChild <fChildPhiMax));
- if(childok)
- {
- pch[ncsel][0]=pc[0];
- pch[ncsel][1]=pc[1];
- pch[ncsel][2]=pc[2];
- kfch[ncsel]=kf;
- ncsel++;
+
+ if (ChildSelected(TMath::Abs(kf)) || fForceDecay == kAll && trackIt[i])
+ {
+ if (fCutOnChild) {
+ pc[0]=iparticle->Px();
+ pc[1]=iparticle->Py();
+ pc[2]=iparticle->Pz();
+ Bool_t childok = KinematicSelection(iparticle, 1);
+ if(childok) {
+ pSelected[i] = 1;
+ ncsel++;
+ } else {
+ ncsel=-1;
+ break;
+ } // child kine cuts
} else {
- ncsel=-1;
- break;
- } // child kine cuts
- } else {
- pch[ncsel][0]=pc[0];
- pch[ncsel][1]=pc[1];
- pch[ncsel][2]=pc[2];
- kfch[ncsel]=kf;
- ncsel++;
- } // if child selection
- } // select muon
- } // decay particle loop
+ pSelected[i] = 1;
+ ncsel++;
+ } // if child selection
+ } // select muon
+ } // decay particle loop
+ } // if decay products
+
Int_t iparent;
if ((fCutOnChild && ncsel >0) || !fCutOnChild){
ipa++;
//
-// parent
- gAlice->
- SetTrack(0,-1,iPart,p,origin0,polar,0,"Primary",nt,wgtp);
- iparent=nt;
- gAlice->KeepTrack(nt);
- for (i=0; i< ncsel; i++) {
- gAlice->SetTrack(fTrackIt,iparent,kfch[i],
- &pch[i][0],och,polar,
- 0,"Decay",nt,wgtch);
- gAlice->KeepTrack(nt);
- }
+// Parent
+ SetTrack(0, -1, iPart, p, origin0, polar, 0, kPPrimary, nt, wgtp);
+ pParent[0] = nt;
+ KeepTrack(nt);
+//
+// Decay Products
+//
+ for (i = 1; i < np; i++) {
+ if (pSelected[i]) {
+ TParticle* iparticle = (TParticle *) particles->At(i);
+ Int_t kf = iparticle->GetPdgCode();
+ Int_t ipa = iparticle->GetFirstMother()-1;
+
+ och[0] = origin0[0]+iparticle->Vx()/10;
+ och[1] = origin0[1]+iparticle->Vy()/10;
+ och[2] = origin0[2]+iparticle->Vz()/10;
+ pc[0] = iparticle->Px();
+ pc[1] = iparticle->Py();
+ pc[2] = iparticle->Pz();
+
+ if (ipa > -1) {
+ iparent = pParent[ipa];
+ } 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;
} // kinematic selection
else // nodecay option, so parent will be tracked by GEANT (pions, kaons, eta, omegas, baryons)
{
gAlice->
- SetTrack(fTrackIt,-1,iPart,p,origin0,polar,0,"Primary",nt,wgtp);
+ SetTrack(fTrackIt,-1,iPart,p,origin0,polar,0,kPPrimary,nt,wgtp);
ipa++;
}
break;
} // while
} // event loop
+ SetHighWaterMark(nt);
}
-Bool_t AliGenParam::ChildSelected(Int_t ip)
+void AliGenParam::Draw()
{
-// True if particle is in list of selected children
- for (Int_t i=0; i<5; i++)
- {
- if (fChildSelect[i]==ip) return kTRUE;
- }
- return kFALSE;
+ //
+ // 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");
}
-Bool_t AliGenParam::KinematicSelection(TParticle *particle)
-{
-// Perform kinematic cuts
- Float_t px=particle->Px();
- Float_t py=particle->Py();
- Float_t pz=particle->Pz();
-//
-// momentum cut
- Float_t p=TMath::Sqrt(px*px+py*py+pz*pz);
- if (p > fPMax || p < fPMin)
- {
-// printf("\n failed p cut %f %f %f \n",p,fPMin,fPMax);
- return kFALSE;
- }
- Float_t pt=TMath::Sqrt(px*px+py*py);
-
-//
-// theta cut
- Float_t theta = Float_t(TMath::ATan2(Double_t(pt),Double_t(p)));
- if (theta > fThetaMax || theta < fThetaMin)
- {
-// printf("\n failed theta cut %f %f %f \n",theta,fThetaMin,fThetaMax);
- return kFALSE;
- }
-
- return kTRUE;
-}
-
-
AliGenParam& AliGenParam::operator=(const AliGenParam& rhs)
{
// Assignment operator
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff