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      if(!fgkParticleMass[0]) Init();
  40      return fgkParticleMass[iType];
  41   }
  42   static const char*   ParticleName(Int_t iType)
  43     {return fgkParticleName[iType];};
  44   static const char*   ParticleShortName(Int_t iType)
  45     {return fgkParticleShortName[iType];};
  46   static const char*   ParticleLatexName(Int_t iType)
  47     {return fgkParticleLatexName[iType];};
  48   static Int_t         ParticleCode(Int_t iType)
  49     {return fgkParticleCode[iType];};
  50
  51   AliPID();
  52   AliPID(const Double_t* probDensity, Bool_t charged = kTRUE);
  53   AliPID(const Float_t* probDensity, Bool_t charged = kTRUE);
  54   AliPID(const AliPID& pid);
  55   AliPID& operator = (const AliPID& pid);
  56
  57   Double_t             GetProbability(EParticleType iType,
  58                                       const Double_t* prior) const;
  59   Double_t             GetProbability(EParticleType iType) const;
  60   void                 GetProbabilities(Double_t* probabilities,
  61                                         const Double_t* prior) const;
  62   void                 GetProbabilities(Double_t* probabilities) const;
  63   EParticleType        GetMostProbable(const Double_t* prior) const;
  64   EParticleType        GetMostProbable() const;
  65
  66   void                 SetProbabilities(const Double_t* probabilities,
  67                                         Bool_t charged = kTRUE);
  68
  69   static void          SetPriors(const Double_t* prior,
  70                                  Bool_t charged = kTRUE);
  71   static void          SetPrior(EParticleType iType, Double_t prior);
  72
  73   AliPID&              operator *= (const AliPID& pid);
  74
  75  private:
  76
  77   static void          Init();
  78
  79   Bool_t               fCharged;                   // flag for charged/neutral
  80   Double_t             fProbDensity[kSPECIESN];    // probability densities
  81   static Double_t      fgPrior[kSPECIESN];         // a priori probabilities
  82
  83   static /*const*/ Float_t fgkParticleMass[kSPECIESN+1]; // particle masses
  84   static const char*   fgkParticleName[kSPECIESN+1]; // particle names
  85   static const char*   fgkParticleShortName[kSPECIESN+1]; // particle names
  86   static const char*   fgkParticleLatexName[kSPECIESN+1]; // particle names
  87   static const Int_t   fgkParticleCode[kSPECIESN+1]; // particle codes
  88
  89   ClassDef(AliPID, 2)    // particle id probability densities
  90 };
  91
  92
  93 AliPID operator * (const AliPID& pid1, const AliPID& pid2);
  94
  95
  96 #endif