+/**************************************************************************
+ * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
+ * *
+ * Author: The ALICE Off-line Project. *
+ * Contributors are mentioned in the code where appropriate. *
+ * *
+ * Permission to use, copy, modify and distribute this software and its *
+ * documentation strictly for non-commercial purposes is hereby granted *
+ * without fee, provided that the above copyright notice appears in all *
+ * copies and that both the copyright notice and this permission notice *
+ * appear in the supporting documentation. The authors make no claims *
+ * about the suitability of this software for any purpose. It is *
+ * provided "as is" without express or implied warranty. *
+ **************************************************************************/
+
+/*
+$Log$
+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
+
+*/
+
#include "AliGenParam.h"
+#include "AliDecayerPythia.h"
#include "AliGenMUONlib.h"
#include "AliRun.h"
-#include "TGeant3.h"
-#include "AliPythia.h"
-#include <TDirectory.h>
-#include <TFile.h>
-#include <TTree.h>
-#include <stdlib.h>
-#include <TMCParticle.h>
+#include <TParticle.h>
+#include <TParticlePDG.h>
+#include <TDatabasePDG.h>
+#include <TLorentzVector.h>
+
+#include <TF1.h>
ClassImp(AliGenParam)
//Begin_Html
/*
- <img src="gif/AliGenParam.gif">
+ <img src="picts/AliGenParam.gif">
*/
//End_Html
//____________________________________________________________
//____________________________________________________________
AliGenParam::AliGenParam()
- :AliGenerator()
{
- fPtPara = 0;
- fYPara = 0;
- fParam = jpsi_p;
- fAnalog = analog;
+// Deafault constructor
+ fPtPara = 0;
+ fYPara = 0;
+ fParam = 0;
+ fAnalog = kAnalog;
+ SetDeltaPt();
+//
+// Set random number generator
+ sRandom = fRandom;
+}
+
+AliGenParam::AliGenParam(Int_t npart, AliGenLib * Library, Int_t param, char* tname):AliGenMC(npart)
+{
+// Constructor using number of particles parameterisation id and library
+
+ fPtParaFunc = Library->GetPt(param, tname);
+ fYParaFunc = Library->GetY (param, tname);
+ fIpParaFunc = Library->GetIp(param, tname);
+
+ fPtPara = 0;
+ fYPara = 0;
+ fParam = param;
+ fAnalog = kAnalog;
+ SetForceDecay();
+ SetDeltaPt();
+//
+// Set random number generator
+ sRandom = fRandom;
}
//____________________________________________________________
-AliGenParam::AliGenParam(Int_t npart, Param_t param)
-// Double_t (*PtPara)(Double_t*, Double_t*),
-// Double_t (*YPara) (Double_t* ,Double_t*))
- :AliGenerator(npart)
+
+AliGenParam::AliGenParam(Int_t npart, Int_t param, char* tname):AliGenMC(npart)
{
- //
- // fName="HMESONpara";
- // fTitle="Heavy Mesons Parametrisation";
- fPtParaFunc = AliGenMUONlib::GetPt(param);
- fYParaFunc = AliGenMUONlib::GetY(param);
- fIpParaFunc = AliGenMUONlib::GetIp(param);
-
- fPtPara = 0;
- fYPara = 0;
- fParam = param;
- fAnalog = analog;
- fChildSelect.Set(5);
- for (Int_t i=0; i<5; i++) fChildSelect[i]=0;
- ForceDecay();
+// Constructor using parameterisation id and number of particles
+//
+ AliGenLib* pLibrary = new AliGenMUONlib();
+
+ fPtParaFunc = pLibrary->GetPt(param, tname);
+ fYParaFunc = pLibrary->GetY (param, tname);
+ fIpParaFunc = pLibrary->GetIp(param, tname);
+
+ fPtPara = 0;
+ fYPara = 0;
+ fParam = param;
+ fAnalog = kAnalog;
+ fChildSelect.Set(5);
+ for (Int_t i=0; i<5; i++) fChildSelect[i]=0;
+ SetForceDecay();
+ SetCutOnChild();
+ SetChildMomentumRange();
+ SetChildPtRange();
+ SetChildPhiRange();
+ SetChildThetaRange();
+ SetDeltaPt();
+}
+
+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) (TRandom *))
+ :AliGenMC(npart)
+{
+// Constructor
+// Gines Martinez 1/10/99
+ fPtParaFunc = PtPara;
+ fYParaFunc = YPara;
+ fIpParaFunc = IpPara;
+//
+ fPtPara = 0;
+ fYPara = 0;
+ fParam = param;
+ fAnalog = kAnalog;
+ fChildSelect.Set(5);
+ for (Int_t i=0; i<5; i++) fChildSelect[i]=0;
+ SetForceDecay();
+ SetCutOnChild();
+ SetChildMomentumRange();
+ SetChildPtRange();
+ SetChildPhiRange();
+ SetChildThetaRange();
+ SetDeltaPt();
+}
+
+
+AliGenParam::AliGenParam(const AliGenParam & Paramd)
+{
+// copy constructor
}
//____________________________________________________________
AliGenParam::~AliGenParam()
{
+// Destructor
delete fPtPara;
delete fYPara;
}
//____________________________________________________________
void AliGenParam::Init()
{
- SetMC(new AliPythia());
- fPythia= (AliPythia*) fgMCEvGen;
+// Initialisation
-// End of the test !!!
+ fDecayer = new AliDecayerPythia();
//Begin_Html
/*
- <img src="gif/AliGenParam.gif">
+ <img src="picts/AliGenParam.gif">
*/
//End_Html
- fPtPara = new TF1("Pt-Parametrization",fPtParaFunc,fPtMin,fPtMax,0);
- fYPara = new TF1("Y -Parametrization",fYParaFunc,fYMin,fYMax,0);
- TF1* PtPara = new TF1("Pt-Parametrization",fPtParaFunc,0,15,0);
- TF1* YPara = new TF1("Y -Parametrization",fYParaFunc,-6,6,0);
+ fPtPara = new TF1("Pt-Parametrization",fPtParaFunc,fPtMin,fPtMax,0);
+// Set representation precision to 10 MeV
+ Int_t npx= Int_t((fPtMax-fPtMin)/fDeltaPt);
+
+ fPtPara->SetNpx(npx);
+
+ fYPara = new TF1("Y -Parametrization",fYParaFunc,fYMin,fYMax,0);
+ TF1* ptPara = new TF1("Pt-Parametrization",fPtParaFunc,0,15,0);
+ TF1* yPara = new TF1("Y -Parametrization",fYParaFunc,-6,6,0);
//
// dN/dy| y=0
- Double_t y1=0;
- Double_t y2=0;
-
- fdNdy0=fYParaFunc(&y1,&y2);
+ Double_t y1=0;
+ Double_t y2=0;
+
+ fdNdy0=fYParaFunc(&y1,&y2);
//
// Integral over generation region
- Float_t IntYS = YPara ->Integral(fYMin, fYMax);
- Float_t IntPt0 = PtPara->Integral(0,15);
- Float_t IntPtS = PtPara->Integral(fPtMin,fPtMax);
- Float_t PhiWgt=(fPhiMax-fPhiMin)/2./TMath::Pi();
- if (fAnalog) {
- fYWgt = IntYS/fdNdy0;
- fPtWgt = IntPtS/IntPt0;
- fParentWeight = fYWgt*fPtWgt*PhiWgt/fNpart;
- } else {
- fYWgt = IntYS/fdNdy0;
- fPtWgt = (fPtMax-fPtMin)/IntPt0;
- fParentWeight = fYWgt*fPtWgt*PhiWgt/fNpart;
- }
+ Float_t intYS = yPara ->Integral(fYMin, fYMax);
+ Float_t intPt0 = ptPara->Integral(0,15);
+ Float_t intPtS = ptPara->Integral(fPtMin,fPtMax);
+ Float_t phiWgt=(fPhiMax-fPhiMin)/2./TMath::Pi();
+ if (fAnalog == kAnalog) {
+ fYWgt = intYS/fdNdy0;
+ fPtWgt = intPtS/intPt0;
+ fParentWeight = fYWgt*fPtWgt*phiWgt/fNpart;
+ } else {
+ fYWgt = intYS/fdNdy0;
+ fPtWgt = (fPtMax-fPtMin)/intPt0;
+ fParentWeight = fYWgt*fPtWgt*phiWgt/fNpart;
+ }
//
// particle decay related initialization
- fPythia->DefineParticles();
-// semimuonic decays of charm and beauty
- fPythia->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;
- }
+ fDecayer->SetForceDecay(fForceDecay);
+ fDecayer->Init();
+//
+ AliGenMC::Init();
}
//____________________________________________________________
void AliGenParam::Generate()
{
-// Generate 'npart' of heavy mesons (J/Psi, upsilon or phi) in the
-// the desired theta, phi and momentum windows; Gaussian smearing
-// on the vertex is done if selected
-
- AliMC* pMC = AliMC::GetMC();
-
- Float_t polar[3]= {0,0,0};
- //
- Float_t origin[3], origin0[3];
- Float_t pt, pl, ptot;
- Float_t phi, theta;
- Float_t p[3];
+//
+// Generate 'npart' of light and heavy mesons (J/Psi, upsilon or phi, Pion,
+// Kaons, Etas, Omegas) and Baryons (proton, antiprotons, neutrons and
+// antineutrons in the the desired theta, phi and momentum windows;
+// Gaussian smearing on the vertex is done if selected.
+// The decay of heavy mesons is done using lujet,
+// and the childern particle are tracked by GEANT
+// 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]; // Momentum, polarisation and origin of the children particles from lujet
Float_t ty, xmt;
- Int_t i, nt, j;
+ 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();
//
Float_t random[6];
+
+// Calculating vertex position per event
for (j=0;j<3;j++) origin0[j]=fOrigin[j];
- if(fVertexSmear==perEvent) {
- pMC->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]));
- }
+ if(fVertexSmear==kPerEvent) {
+ Vertex();
+ for (j=0;j<3;j++) origin0[j]=fVertex[j];
}
- for(i=0;i<fNpart;i++) {
+
+ Int_t ipa=0;
+
+// Generating fNpart particles
+ while (ipa<fNpart) {
while(1) {
//
// particle type
- Int_t Ipart = fIpParaFunc();
- fChildWeight=(fPythia->GetBraPart(Ipart))*fParentWeight;
- Float_t am=fPythia->GetPMAS(fPythia->LuComp(Ipart),1);
- pMC->Rndm(random,2);
+ Int_t iPart = fIpParaFunc(fRandom);
+ 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);
ty=Float_t(TMath::TanH(fYPara->GetRandom()));
//
// pT
- if (fAnalog) {
+ 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;
pl=xmt*ty/sqrt(1.-ty*ty);
theta=TMath::ATan2(pt,pl);
+// Cut on theta
if(theta<fThetaMin || theta>fThetaMax) continue;
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==perTrack) {
- pMC->Rndm(random,6);
+ if(fVertexSmear==kPerTrack) {
+ Rndm(random,6);
for (j=0;j<3;j++) {
origin0[j]=
fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
}
}
- Int_t kg=fPythia->GetGeantCode(Ipart);
+// Looking at fForceDecay :
+// if fForceDecay != none Primary particle decays using
+// AliPythia and children are tracked by GEANT
//
-// parent
-
- gAlice->
- SetTrack(0,-1,kg,p,origin,polar,0,"Primary",nt,wgtp);
- Int_t iparent=nt;
+// if fForceDecay == none Primary particle is tracked by GEANT
+// (In the latest, make sure that GEANT actually does all the decays you want)
//
-// use lujet to decay particle
- Float_t energy=TMath::Sqrt(ptot*ptot+am*am);
- fPythia->DecayParticle(Ipart,energy,theta,phi);
-// fPythia->LuList(1);
-
+ 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);
+ fDecayer->Decay(iPart,&pmom);
//
-// select muons
- TObjArray* particles = fPythia->GetPrimaries() ;
- Int_t np = particles->GetEntriesFast();
- for (Int_t i = 0; i<np; i++) {
- TMCParticle * iparticle = (TMCParticle *) particles->At(i);
- Int_t kf = iparticle->GetKF();
+// select decay particles
+ Int_t np=fDecayer->ImportParticles(particles);
+ Int_t ncsel=0;
+ 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) {
+ printf("\n deselected %d", i);
+ 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();
+ printf("\n lifetime %d %e %e %e ", i, lifeTime, mass, width);
+ if (lifeTime > (Double_t) 1.e-15) {
+ 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)))
- {
- p[0]=iparticle->GetPx();
- p[1]=iparticle->GetPy();
- p[2]=iparticle->GetPz();
- origin[0]=origin0[0]+iparticle->GetVx()/10;
- origin[1]=origin0[1]+iparticle->GetVy()/10;
- origin[2]=origin0[2]+iparticle->GetVz()/10;
- gAlice->SetTrack(fTrackIt,iparent,fPythia->GetGeantCode(kf),
- p,origin,polar,
- 0,"Decay",nt,wgtch);
- gAlice->KeepTrack(nt);
- } // select muon
- } // decay particle loop
+ 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 {
+ 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, kPPrimary, nt, wgtp);
+ pParent[0] = nt;
+ gAlice->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;
+ }
+ printf("\n SetTrack %d %d %d %d", i, kf, iparent, trackIt[i]);
+ gAlice->SetTrack(fTrackIt*trackIt[i], iparent, kf,
+ pc, och, polar,
+ 0, kPDecay, nt, wgtch);
+ pParent[i] = nt;
+ gAlice->KeepTrack(nt);
+ }
+ }
+ } // Decays by Lujet
+
+ 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,kPPrimary,nt,wgtp);
+ ipa++;
+ }
break;
- } // kinematic selection
+ } // while
} // event loop
+ gAlice->SetHighWaterMark(nt);
}
-Bool_t AliGenParam::ChildSelected(Int_t ip)
+AliGenParam& AliGenParam::operator=(const AliGenParam& rhs)
{
- for (Int_t i=0; i<5; i++)
- {
- if (fChildSelect[i]==ip) return kTRUE;
- }
- return kFALSE;
+// Assignment operator
+ return *this;
}
-Bool_t AliGenParam::KinematicSelection(TMCParticle *particle)
-{
- Float_t px=particle->GetPx();
- Float_t py=particle->GetPy();
- Float_t pz=particle->GetPz();
-//
-// 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;
-}
-
-
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff