// @(#)root/eg:$Name: $:$Id: TParticle.h,v 1.5 2001/05/17 10:57:15 brun Exp $ // Author: Rene Brun , Federico Carminati 26/04/99 /************************************************************************* * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. * * All rights reserved. * * * * For the licensing terms see $ROOTSYS/LICENSE. * * For the list of contributors see $ROOTSYS/README/CREDITS. * *************************************************************************/ ////////////////////////////////////////////////////////////////////////// // // // TParticle: defines equivalent of HEPEVT particle // ////////////////////////////////////////////////////////////////////////// #ifndef ROOT_TParticle #define ROOT_TParticle #ifndef ROOT_TNamed #include "TNamed.h" #endif #ifndef ROOT_TAttLine #include "TAttLine.h" #endif #ifndef ROOT_TAtt3D #include "TAtt3D.h" #endif #ifndef ROOT_X3DBuffer #include "X3DBuffer.h" #endif #ifndef ROOT_TLorentzVector #include "TLorentzVector.h" #endif #ifndef ROOT_TParticlePDG #include "TParticlePDG.h" #endif #ifndef ROOT_TDatabasePDG #include "TDatabasePDG.h" #endif class TParticle : public TObject, public TAttLine, public TAtt3D { protected: Int_t fPdgCode; // PDG code of the particle Int_t fStatusCode; // generation status code Int_t fMother[2]; // Indices of the mother particles Int_t fDaughter[2]; // Indices of the daughter particles Float_t fWeight; // particle weight Double_t fCalcMass; // Calculated mass Double_t fPx; // x component of momentum Double_t fPy; // y component of momentum Double_t fPz; // z component of momentum Double_t fE; // Energy Double_t fVx; // x of production vertex Double_t fVy; // y of production vertex Double_t fVz; // z of production vertex Double_t fVt; // t of production vertex Double_t fPolarTheta; // Polar angle of polarisation Double_t fPolarPhi; // azymutal angle of polarisation TParticlePDG* fParticlePDG; //! reference to the particle record in PDG database //the line above should be changed to the following line when all compilers //will be able to digest the mutable keyword (We want to have GetPDG const !!) //mutable TParticlePDG* fParticlePDG; //! reference to the particle record in PDG database //---------------------------------------------------------------------------- // functions //---------------------------------------------------------------------------- public: // ****** constructors and destructor TParticle(); TParticle(Int_t pdg, Int_t status, Int_t mother1, Int_t mother2, Int_t daughter1, Int_t daughter2, Double_t px, Double_t py, Double_t pz, Double_t etot, Double_t vx, Double_t vy, Double_t vz, Double_t time); TParticle(Int_t pdg, Int_t status, Int_t mother1, Int_t mother2, Int_t daughter1, Int_t daughter2, const TLorentzVector &p, const TLorentzVector &v); TParticle(const TParticle &part); virtual ~TParticle(); // virtual TString* Name () const { return fName.Data(); } // virtual char* GetName() const { return fName.Data(); } Int_t GetStatusCode () const { return fStatusCode; } Int_t GetPdgCode () const { return fPdgCode; } Int_t GetFirstMother () const { return fMother[0]; } Int_t GetMother (Int_t i) const { return fMother[i]; } Int_t GetSecondMother () const { return fMother[1]; } Int_t GetFirstDaughter() const { return fDaughter[0]; } Int_t GetDaughter (Int_t i) const { return fDaughter[i]; } Int_t GetLastDaughter () const { return fDaughter[1]; } Double_t GetCalcMass () const { return fCalcMass; } Double_t GetMass () { return GetPDG()->Mass();} Int_t GetNDaughters () const { return fDaughter[1]>0 ? fDaughter[1]-fDaughter[0]+1 : 0;} void GetPolarisation(TVector3 &v); Float_t GetWeight () const { return fWeight;} TParticlePDG* GetPDG (Int_t mode = 0); Int_t Beauty () { return GetPDG()->Beauty(); } Int_t Charm () { return GetPDG()->Charm(); } Int_t Strangeness () { return GetPDG()->Strangeness();} void Momentum(TLorentzVector &v) { v.SetPxPyPzE(fPx,fPy,fPz,fE);} void ProductionVertex(TLorentzVector &v) { v.SetXYZT(fVx,fVy,fVz,fVt);} // ****** redefine several most oftenly used // methods of LORENTZ_VECTOR Double_t Vx () const { return fVx;} Double_t Vy () const { return fVy;} Double_t Vz () const { return fVz;} Double_t T () const { return fVt;} Double_t Px () const { return fPx; } Double_t Py () const { return fPy; } Double_t Pz () const { return fPz; } Double_t P () const { return TMath::Sqrt(fPx*fPx+fPy*fPy+fPz*fPz); } Double_t Pt () const { return TMath::Sqrt(fPx*fPx+fPy*fPy); } Double_t Energy() const { return fE; } Double_t Eta () const { if (P() != fPz) return 0.5*TMath::Log((P()+fPz)/(P()-fPz)); else return 1.e30; } Double_t Phi () const { return kPI+TMath::ATan2(-fPy,-fPx); } Double_t Theta () const { return (fPz==0)?kPI/2:TMath::ACos(fPz/P()); } // setters void SetFirstMother (int code) { fMother[0] = code ; } void SetMother (int i, int code) { fMother[i] = code ; } void SetLastMother (int code) { fMother[1] = code ; } void SetFirstDaughter(int code) { fDaughter[0] = code ; } void SetDaughter(int i, int code) { fDaughter[i] = code ; } void SetLastDaughter(int code) { fDaughter[1] = code ; } void SetCalcMass(Double_t mass) { fCalcMass=mass;} void SetPolarisation(Double_t polx, Double_t poly, Double_t polz); void SetPolarisation(const TVector3& v) {SetPolarisation(v.X(), v.Y(), v.Z());} void SetWeight(Float_t weight = 1) { fWeight = weight; } void SetMomentum(Double_t px, Double_t py, Double_t pz, Double_t e) {fPx=px; fPy=py; fPz=pz; fE=e;} void SetMomentum(const TLorentzVector& p) {SetMomentum(p.Px(),p.Py(),p.Pz(),p.Energy());} void SetProductionVertex(Double_t vx, Double_t vy, Double_t vz, Double_t t) {fVx=vx; fVy=vy; fVz=vz; fVt=t;} void SetProductionVertex(const TLorentzVector& v) {SetProductionVertex(v.X(),v.Y(),v.Z(),v.T());} // ****** overloaded functions of TObject virtual void Paint(Option_t *option = ""); virtual void Print(Option_t *option = "") const; virtual void Sizeof3D() const; virtual Int_t DistancetoPrimitive(Int_t px, Int_t py); virtual void ExecuteEvent(Int_t event, Int_t px, Int_t py); virtual const char *GetName() const; virtual const char *GetTitle() const; ClassDef(TParticle,2) // TParticle vertex particle information }; #endif