4 //Ali HBT Particle: simplified class TParticle
5 //Simplified in order to minimize the size of object
6 // - we want to keep a lot of such a objects in memory
9 #include <TLorentzVector.h>
11 #include <TDatabasePDG.h>
15 class AliHBTParticle : public TObject
19 // ****** constructors and destructor
21 AliHBTParticle(const AliHBTParticle& in);
23 AliHBTParticle(Int_t pdg, Int_t idx, Double_t px, Double_t py, Double_t pz, Double_t etot,
24 Double_t vx, Double_t vy, Double_t vz, Double_t time);
26 AliHBTParticle(Int_t pdg, Float_t prob, Int_t idx, Double_t px, Double_t py, Double_t pz, Double_t etot,
27 Double_t vx, Double_t vy, Double_t vz, Double_t time);
29 AliHBTParticle(const TParticle& p,Int_t idx);
31 virtual ~AliHBTParticle();
33 AliHBTParticle& operator=(const AliHBTParticle& in);
35 void SetPIDprobability(Int_t pdg, Float_t prob = 1.0);
36 Float_t GetPIDprobability(Int_t pdg);
38 Int_t GetPdgCode () const { return (fPids)?fPids[fPdgIdx]:0;}
39 Int_t GetPid () const { return GetPdgCode();}
40 Float_t GetPidProb () const { return (fPidProb)?fPidProb[fPdgIdx]:0;}
42 Int_t GetUID () const { return fIdxInEvent;}
43 Int_t GetNumberOfPids () const { return fNPids;}
44 Int_t GetNthPid (Int_t idx) const;
45 Float_t GetNthPidProb (Int_t idx) const;
47 void SetPdgCode(Int_t pdg, Float_t prob = 1.0);
48 Double_t GetCalcMass () const { return fCalcMass; }
49 Double_t GetMass () { return (GetPDG())?GetPDG()->Mass():-1.;}
51 TParticlePDG* GetPDG (){return TDatabasePDG::Instance()->GetParticle(GetPdgCode());}
53 Int_t Beauty () { return GetPDG()->Beauty(); }
54 Int_t Charm () { return GetPDG()->Charm(); }
55 Int_t Strangeness () { return GetPDG()->Strangeness();}
56 void ProductionVertex(TLorentzVector &v) { v.SetXYZT(fVx,fVy,fVz,fVt);}
59 Double_t Vx () const { return fVx;}
60 Double_t Vy () const { return fVy;}
61 Double_t Vz () const { return fVz;}
62 Double_t T () const { return fVt;}
64 Double_t Px () const { return fPx; } //X coordinate of the momentum
65 Double_t Py () const { return fPy; } //Y coordinate of the momentum
66 Double_t Pz () const { return fPz; } //Z coordinate of the momentum
67 Double_t P () const //momentum
68 { return TMath::Sqrt(fPx*fPx+fPy*fPy+fPz*fPz); }
70 void Momentum(TLorentzVector &v) { v.SetPxPyPzE(fPx,fPy,fPz,fE);}
72 Double_t Pt () const //transverse momentum
73 { return TMath::Sqrt(fPx*fPx+fPy*fPy); }
74 Double_t Energy() const { return fE; }
77 Double_t Eta () const { if (P() != fPz) return 0.5*TMath::Log((P()+fPz)/(P()-fPz));
81 Double_t Y () const { if (fE != fPz) return 0.5*TMath::Log((fE+fPz)/(fE-fPz));
84 Double_t Phi () const { return kPI+TMath::ATan2(-fPy,-fPx); }
86 Double_t Theta () const { return (fPz==0)?kPI/2:TMath::ACos(fPz/P()); }
91 void SetMomentum(Double_t px, Double_t py, Double_t pz, Double_t e)
92 {fPx=px; fPy=py; fPz=pz; fE=e;}
93 void SetMomentum(const TLorentzVector& p)
94 {SetMomentum(p.Px(),p.Py(),p.Pz(),p.Energy());}
96 void SetProductionVertex(Double_t vx, Double_t vy, Double_t vz, Double_t t)
97 {fVx=vx; fVy=vy; fVz=vz; fVt=t;}
98 void SetProductionVertex(const TLorentzVector& v)
99 {SetProductionVertex(v.X(),v.Y(),v.Z(),v.T());}
100 const Char_t* GetName() const;
103 static void SetDebug(Int_t dbg=1){fgDebug=dbg;}
104 static Int_t GetDebug(){return fgDebug;}
105 static Int_t fgDebug; //debug printout level
108 Int_t GetPidSlot(Int_t pdg) const;//returns position of the given PID in fPids (and fPidProb) array.
111 Char_t fPdgIdx; // index of PDG code of the particle in fPids
112 Int_t fIdxInEvent; // index of a particle: the same particle can appear in the event
113 // many times with different pid's. Idx allows to check that they are the same particles
114 Int_t fNPids; // number of non-zero proboble Pids
115 Int_t *fPids; // [fNPids] Array with PIDs
116 Float_t *fPidProb; // [fNPids] PIDs probabilities
117 Double_t fCalcMass; // Calculated mass
119 Double_t fPx; // x component of momentum
120 Double_t fPy; // y component of momentum
121 Double_t fPz; // z component of momentum
122 Double_t fE; // Energy
124 Double_t fVx; // x of production vertex
125 Double_t fVy; // y of production vertex
126 Double_t fVz; // z of production vertex
127 Double_t fVt; // t of production vertex
129 ClassDef(AliHBTParticle,2) // TParticle vertex particle information