Correcting for disappearance of kPI
[u/mrichter/AliRoot.git] / HBTAN / AliHBTParticle.h
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1b446896 1#ifndef ALIHBTPARTICLE
2#define ALIHBTPARTICLE
3
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
7
8#include <TObject.h>
9#include <TLorentzVector.h>
10#include <TMath.h>
11#include <TDatabasePDG.h>
12
829f5c7c 13#include "AliConst.h"
14
1b446896 15class TParticle;
16
17class AliHBTParticle : public TObject
18{
19
20public:
21 // ****** constructors and destructor
22 AliHBTParticle();
8089a083 23 AliHBTParticle(const AliHBTParticle& in);
24
25 AliHBTParticle(Int_t pdg, Int_t idx, Double_t px, Double_t py, Double_t pz, Double_t etot,
26 Double_t vx, Double_t vy, Double_t vz, Double_t time);
1b446896 27
8089a083 28 AliHBTParticle(Int_t pdg, Float_t prob, Int_t idx, Double_t px, Double_t py, Double_t pz, Double_t etot,
1b446896 29 Double_t vx, Double_t vy, Double_t vz, Double_t time);
30
8089a083 31 AliHBTParticle(const TParticle& p,Int_t idx);
1b446896 32
bed069a4 33 virtual ~AliHBTParticle();
34
35 AliHBTParticle& operator=(const AliHBTParticle& in);
36
8089a083 37 void SetPIDprobability(Int_t pdg, Float_t prob = 1.0);
38 Float_t GetPIDprobability(Int_t pdg);
39
40 Int_t GetPdgCode () const { return (fPids)?fPids[fPdgIdx]:0;}
41 Int_t GetPid () const { return GetPdgCode();}
42 Float_t GetPidProb () const { return (fPidProb)?fPidProb[fPdgIdx]:0;}
43
44 Int_t GetUID () const { return fIdxInEvent;}
e665964c 45 Int_t GetNumberOfPids () const { return fNPids;}
46 Int_t GetNthPid (Int_t idx) const;
47 Float_t GetNthPidProb (Int_t idx) const;
48
8089a083 49 void SetPdgCode(Int_t pdg, Float_t prob = 1.0);
1b446896 50 Double_t GetCalcMass () const { return fCalcMass; }
8089a083 51 Double_t GetMass () { return (GetPDG())?GetPDG()->Mass():-1.;}
1b446896 52
8089a083 53 TParticlePDG* GetPDG (){return TDatabasePDG::Instance()->GetParticle(GetPdgCode());}
1b446896 54
55 Int_t Beauty () { return GetPDG()->Beauty(); }
56 Int_t Charm () { return GetPDG()->Charm(); }
57 Int_t Strangeness () { return GetPDG()->Strangeness();}
58 void ProductionVertex(TLorentzVector &v) { v.SetXYZT(fVx,fVy,fVz,fVt);}
59
60
61 Double_t Vx () const { return fVx;}
62 Double_t Vy () const { return fVy;}
63 Double_t Vz () const { return fVz;}
64 Double_t T () const { return fVt;}
65
66 Double_t Px () const { return fPx; } //X coordinate of the momentum
67 Double_t Py () const { return fPy; } //Y coordinate of the momentum
68 Double_t Pz () const { return fPz; } //Z coordinate of the momentum
69 Double_t P () const //momentum
70 { return TMath::Sqrt(fPx*fPx+fPy*fPy+fPz*fPz); }
71
72 void Momentum(TLorentzVector &v) { v.SetPxPyPzE(fPx,fPy,fPz,fE);}
73
74 Double_t Pt () const //transverse momentum
75 { return TMath::Sqrt(fPx*fPx+fPy*fPy); }
76 Double_t Energy() const { return fE; }
77
78 //Pseudo Rapidity
79 Double_t Eta () const { if (P() != fPz) return 0.5*TMath::Log((P()+fPz)/(P()-fPz));
80 else return 1.e30;}
81
82 //Rapidity
83 Double_t Y () const { if (fE != fPz) return 0.5*TMath::Log((fE+fPz)/(fE-fPz));
84 else return 1.e30;}
85
86 Double_t Phi () const { return kPI+TMath::ATan2(-fPy,-fPx); }
87
88 Double_t Theta () const { return (fPz==0)?kPI/2:TMath::ACos(fPz/P()); }
89
90 // setters
91
92
93 void SetMomentum(Double_t px, Double_t py, Double_t pz, Double_t e)
94 {fPx=px; fPy=py; fPz=pz; fE=e;}
95 void SetMomentum(const TLorentzVector& p)
96 {SetMomentum(p.Px(),p.Py(),p.Pz(),p.Energy());}
97
98 void SetProductionVertex(Double_t vx, Double_t vy, Double_t vz, Double_t t)
99 {fVx=vx; fVy=vy; fVz=vz; fVt=t;}
100 void SetProductionVertex(const TLorentzVector& v)
101 {SetProductionVertex(v.X(),v.Y(),v.Z(),v.T());}
4d1d0fe9 102 void SetCalcMass(Double_t mass) {fCalcMass = mass;}
637fd167 103 const Char_t* GetName() const;
8089a083 104 void Print() const;
105
106 static void SetDebug(Int_t dbg=1){fgDebug=dbg;}
107 static Int_t GetDebug(){return fgDebug;}
108 static Int_t fgDebug; //debug printout level
1b446896 109
110protected:
8089a083 111 Int_t GetPidSlot(Int_t pdg) const;//returns position of the given PID in fPids (and fPidProb) array.
112
113private:
114 Char_t fPdgIdx; // index of PDG code of the particle in fPids
115 Int_t fIdxInEvent; // index of a particle: the same particle can appear in the event
116 // many times with different pid's. Idx allows to check that they are the same particles
ff3d1148 117 Int_t fNPids; // number of non-zero proboble Pids
118 Int_t *fPids; // [fNPids] Array with PIDs
119 Float_t *fPidProb; // [fNPids] PIDs probabilities
1b446896 120 Double_t fCalcMass; // Calculated mass
121
122 Double_t fPx; // x component of momentum
123 Double_t fPy; // y component of momentum
124 Double_t fPz; // z component of momentum
125 Double_t fE; // Energy
126
127 Double_t fVx; // x of production vertex
128 Double_t fVy; // y of production vertex
129 Double_t fVz; // z of production vertex
130 Double_t fVt; // t of production vertex
131
ff3d1148 132 ClassDef(AliHBTParticle,2) // TParticle vertex particle information
1b446896 133};
134
135#endif