4 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * See cxx source for full Copyright notice */
7 ///////////////////////////////////////////////////////////////////////////////
9 /// particle id probability densities //
11 ///////////////////////////////////////////////////////////////////////////////
19 class AliPID : public TObject {
22 kSPECIES = 5, // Number of particle species recognized by the PID
23 kSPECIESN = 10, // Number of charged+neutral particle species recognized by the PHOS/EMCAL PID
24 kSPECIESLN = 4 // Number of light nuclei: deuteron, triton, helium-3 and alpha
43 static Float_t ParticleMass(Int_t iType) {
44 if(!fgkParticleMass[0]) Init();
45 return fgkParticleMass[iType];
47 static Float_t ParticleMassZ(Int_t iType) {
48 if(!fgkParticleMass[0]) Init();
49 return fgkParticleMassZ[iType];
51 static const char* ParticleName(Int_t iType)
52 {return fgkParticleName[iType];};
53 static const char* ParticleShortName(Int_t iType)
54 {return fgkParticleShortName[iType];};
55 static const char* ParticleLatexName(Int_t iType)
56 {return fgkParticleLatexName[iType];};
57 static Int_t ParticleCode(Int_t iType)
58 {return fgkParticleCode[iType];};
61 AliPID(const Double_t* probDensity, Bool_t charged = kTRUE);
62 AliPID(const Float_t* probDensity, Bool_t charged = kTRUE);
63 AliPID(const AliPID& pid);
64 AliPID& operator = (const AliPID& pid);
66 Double_t GetProbability(EParticleType iType,
67 const Double_t* prior) const;
68 Double_t GetProbability(EParticleType iType) const;
69 void GetProbabilities(Double_t* probabilities,
70 const Double_t* prior) const;
71 void GetProbabilities(Double_t* probabilities) const;
72 EParticleType GetMostProbable(const Double_t* prior) const;
73 EParticleType GetMostProbable() const;
75 void SetProbabilities(const Double_t* probabilities,
76 Bool_t charged = kTRUE);
78 static void SetPriors(const Double_t* prior,
79 Bool_t charged = kTRUE);
80 static void SetPrior(EParticleType iType, Double_t prior);
82 AliPID& operator *= (const AliPID& pid);
88 Bool_t fCharged; // flag for charged/neutral
89 Double_t fProbDensity[kSPECIESN]; // probability densities
90 static Double_t fgPrior[kSPECIESN]; // a priori probabilities
92 static /*const*/ Float_t fgkParticleMass[kSPECIESN+kSPECIESLN+1]; // particle masses
93 static /*const*/ Float_t fgkParticleMassZ[kSPECIESN+kSPECIESLN+1]; // particle masses/charge
94 static const char* fgkParticleName[kSPECIESN+kSPECIESLN+1]; // particle names
95 static const char* fgkParticleShortName[kSPECIESN+kSPECIESLN+1]; // particle names
96 static const char* fgkParticleLatexName[kSPECIESN+kSPECIESLN+1]; // particle names
97 static const Int_t fgkParticleCode[kSPECIESN+kSPECIESLN+1]; // particle codes
99 ClassDef(AliPID, 3) // particle id probability densities
103 AliPID operator * (const AliPID& pid1, const AliPID& pid2);