STEER/AliPID.h

   1 #ifndef ALIPID_H
   2 #define ALIPID_H
   3
   4 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   5  * See cxx source for full Copyright notice                               */
   6
   7 ///////////////////////////////////////////////////////////////////////////////
   8 ///                                                                          //
   9 /// particle id probability densities                                        //
  10 ///                                                                          //
  11 ///////////////////////////////////////////////////////////////////////////////
  12
  13 /* $Id$ */
  14
  15
  16 #include <TObject.h>
  17
  18
  19 class AliPID : public TObject {
  20  public:
  21   enum {
  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   };
  25   enum EParticleType {
  26     kElectron = 0,
  27     kMuon = 1,
  28     kPion = 2,
  29     kKaon = 3,
  30     kProton = 4,
  31     kPhoton = 5,
  32     kPi0 = 6,
  33     kNeutron = 7,
  34     kKaon0 = 8,
  35     kEleCon = 9,
  36     kUnknown = 10
  37   };
  38   static Float_t       ParticleMass(Int_t iType)
  39     {return fgkParticleMass[iType];};
  40   static const char*   ParticleName(Int_t iType)
  41     {return fgkParticleName[iType];};
  42   static Int_t         ParticleCode(Int_t iType)
  43     {return fgkParticleCode[iType];};
  44
  45   AliPID();
  46   AliPID(const Double_t* probDensity, Bool_t charged = kTRUE);
  47   AliPID(const Float_t* probDensity, Bool_t charged = kTRUE);
  48   AliPID(const AliPID& pid);
  49   AliPID& operator = (const AliPID& pid);
  50
  51   Double_t             GetProbability(EParticleType iType,
  52                                       const Double_t* prior) const;
  53   Double_t             GetProbability(EParticleType iType) const;
  54   void                 GetProbabilities(Double_t* probabilities,
  55                                         const Double_t* prior) const;
  56   void                 GetProbabilities(Double_t* probabilities) const;
  57   EParticleType        GetMostProbable(const Double_t* prior) const;
  58   EParticleType        GetMostProbable() const;
  59
  60   void                 SetProbabilities(const Double_t* probabilities,
  61                                         Bool_t charged = kTRUE);
  62
  63   static void          SetPriors(const Double_t* prior,
  64                                  Bool_t charged = kTRUE);
  65   static void          SetPrior(EParticleType iType, Double_t prior);
  66
  67   AliPID&              operator *= (const AliPID& pid);
  68
  69  private:
  70
  71   void                 Init();
  72
  73   Bool_t               fCharged;                   // flag for charged/neutral
  74   Double_t             fProbDensity[kSPECIESN];    // probability densities
  75   static Double_t      fgPrior[kSPECIESN];         // a priori probabilities
  76
  77   static /*const*/ Float_t fgkParticleMass[kSPECIESN+1]; // particle masses
  78   static const char*   fgkParticleName[kSPECIESN+1]; // particle names
  79   static const Int_t   fgkParticleCode[kSPECIESN+1]; // particle codes
  80
  81   ClassDef(AliPID, 1)    // particle id probability densities
  82 };
  83
  84
  85 AliPID operator * (const AliPID& pid1, const AliPID& pid2);
  86
  87
  88 #endif