X-Git-Url: http://git.uio.no/git/?a=blobdiff_plain;f=EVGEN%2FAliGenParam.cxx;h=1812b835bdee605a8e470cfce65fce48e6047d5b;hb=65de9f86874430b66b3154fd9eeb2324134dfe0c;hp=60c07cd2068f4c5b6b616dfb9d518ee8cf4744ce;hpb=749070b64366d92bcab0d57667eb66e62cf436b2;p=u%2Fmrichter%2FAliRoot.git diff --git a/EVGEN/AliGenParam.cxx b/EVGEN/AliGenParam.cxx index 60c07cd2068..1812b835bde 100644 --- a/EVGEN/AliGenParam.cxx +++ b/EVGEN/AliGenParam.cxx @@ -15,6 +15,81 @@ /* $Log$ +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. + +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. @@ -33,12 +108,24 @@ 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 "AliGenMUONlib.h" -#include "AliGenPHOSlib.h" #include "AliRun.h" -#include "AliPythia.h" #include +#include +#include +#include + +#include ClassImp(AliGenParam) @@ -53,56 +140,83 @@ ClassImp(AliGenParam) //____________________________________________________________ //____________________________________________________________ AliGenParam::AliGenParam() - :AliGenerator() { -// Constructor - fPtPara = 0; - fYPara = 0; - fParam = jpsi_p; - fAnalog = analog; - SetCutOnChild(); - SetChildMomentumRange(); - SetChildPtRange(); - SetChildPhiRange(); - SetChildThetaRange(); - SetDeltaPt(); +// Deafault constructor + fPtPara = 0; + fYPara = 0; + 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); + 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) :AliGenerator(npart) +AliGenParam::AliGenParam(Int_t npart, Int_t param, char* tname):AliGenMC(npart) { -// Constructor - // - // 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; - SetForceDecay(); - SetCutOnChild(); - SetChildMomentumRange(); - SetChildPtRange(); - SetChildPhiRange(); - SetChildThetaRange(); - SetDeltaPt(); +// 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); + 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, 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; @@ -110,7 +224,7 @@ AliGenParam::AliGenParam(Int_t npart, Param_t param, 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(); @@ -122,6 +236,13 @@ AliGenParam::AliGenParam(Int_t npart, Param_t param, SetDeltaPt(); } + +AliGenParam::AliGenParam(const AliGenParam & Param) +{ +// copy constructor + Param.Copy(*this); +} + //____________________________________________________________ AliGenParam::~AliGenParam() { @@ -134,9 +255,8 @@ AliGenParam::~AliGenParam() void AliGenParam::Init() { // Initialisation - SetMC(new AliPythia()); - fPythia= (AliPythia*) fgMCEvGen; - + + fDecayer = new AliDecayerPythia(); //Begin_Html /* @@ -165,7 +285,7 @@ void AliGenParam::Init() 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; @@ -176,35 +296,11 @@ void AliGenParam::Init() } // // particle decay related initialization - fPythia->DefineParticles(); -// semimuonic decays of charm and beauty - fPythia->ForceDecay(fForceDecay); + fDecayer->SetForceDecay(fForceDecay); + fDecayer->Init(); + // - 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(); } //____________________________________________________________ @@ -220,52 +316,58 @@ void AliGenParam::Generate() // 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); + 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) { - 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])); - } + if(fVertexSmear==kPerEvent) { + Vertex(); + for (j=0;j<3;j++) origin0[j]=fVertex[j]; } + Int_t ipa=0; + // Generating fNpart particles while (ipaGetBraPart(iPart))*fParentWeight; - Float_t am=fPythia->GetPMAS(fPythia->Lucomp(iPart),1); - gMC->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); // // 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; @@ -276,6 +378,12 @@ void AliGenParam::Generate() 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 @@ -283,11 +391,12 @@ void AliGenParam::Generate() ptot=TMath::Sqrt(pt*pt+pl*pl); // Cut on momentum if(ptotfPMax) continue; +// p[0]=pt*TMath::Cos(phi); p[1]=pt*TMath::Sin(phi); p[2]=pl; - if(fVertexSmear==perTrack) { - gMC->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())* @@ -302,123 +411,146 @@ void AliGenParam::Generate() // 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); - fPythia->DecayParticle(iPart,energy,theta,phi); + TLorentzVector pmom(p[0], p[1], p[2], energy); + fDecayer->Decay(iPart,&pmom); // // select decay particles - Int_t np=fPythia->ImportParticles(particles,"All"); + Int_t np=fDecayer->ImportParticles(particles); Int_t ncsel=0; - for (i = 1; iAt(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; i1) { + TParticle* iparticle = (TParticle *) particles->At(0); + Int_t ipF, ipL; + for (i = 1; iAt(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 .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; jPx(); - 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 fChildPMin && pChild fChildThetaMin && thetaChild fChildPhiMin && phiChild 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; - - 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) -{ -// 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; -} - -Bool_t AliGenParam::KinematicSelection(TParticle *particle) +AliGenParam& AliGenParam::operator=(const AliGenParam& rhs) { -// 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; +// Assignment operator + return *this; } -