1 #ifndef ALIITSPIDRESPONSE_H
2 #define ALIITSPIDRESPONSE_H
3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
8 //-------------------------------------------------------
9 // ITS PID response class
12 //-------------------------------------------------------
19 class AliITSPIDResponse : public TObject {
22 AliITSPIDResponse(Bool_t isMC=kFALSE);
23 //AliITSPIDResponse(Double_t *param);
24 ~AliITSPIDResponse() {}
26 void SetBetheBlochParamsITSTPC(Double_t* param){
27 for(Int_t iPar=0; iPar<5; iPar++) fBBtpcits[iPar]=param[iPar];
29 void SetBetheBlochParamsITSTPCDeuteron(Double_t* param){
30 for(Int_t iPar=0; iPar<5; iPar++) fBBdeu[iPar]=param[iPar];
32 void SetBetheBlochParamsITSTPCTriton(Double_t* param){
33 for(Int_t iPar=0; iPar<5; iPar++) fBBtri[iPar]=param[iPar];
35 void SetBetheBlochParamsITSsa(Double_t* param){
36 for(Int_t iPar=0; iPar<5; iPar++) fBBsa[iPar]=param[iPar];
38 void SetBetheBlochHybridParamsITSsa(Double_t* param){
39 for(Int_t iPar=0; iPar<9; iPar++) fBBsaHybrid[iPar]=param[iPar];
41 void SetElectronBetheBlochParamsITSsa(Double_t* param){
42 for(Int_t iPar=0; iPar<5; iPar++) fBBsaElectron[iPar]=param[iPar];
45 Double_t BetheAleph(Double_t p,Double_t mass) const;
46 Double_t Bethe(Double_t p, Double_t mass, Bool_t isSA=kFALSE) const;
47 Double_t Bethe(Double_t p, AliPID::EParticleType species, Bool_t isSA=kFALSE) const;
48 Double_t BetheITSsaHybrid(Double_t p, Double_t mass) const;
49 Double_t GetResolution(Double_t bethe, Int_t nPtsForPid=4, Bool_t isSA=kFALSE,Double_t p=0., AliPID::EParticleType type=AliPID::kPion) const;
50 void GetITSProbabilities(Float_t mom, Double_t qclu[4], Double_t condprobfun[AliPID::kSPECIES],Bool_t isMC=kFALSE) const;
52 Double_t GetNumberOfSigmas( const AliVTrack* track, AliPID::EParticleType species) const;
54 Double_t GetSignalDelta( const AliVTrack* track, AliPID::EParticleType species, Bool_t ratio=kFALSE) const;
56 Float_t GetNumberOfSigmas(Float_t mom, Float_t signal, AliPID::EParticleType type, Int_t nPtsForPid=4, Bool_t isSA=kFALSE) const {
57 if(type==AliPID::kDeuteron && mom<0.4) return -999.;
58 if(type==AliPID::kTriton && mom<0.55) return -999.;
59 const Double_t chargeFactor = TMath::Power(AliPID::ParticleCharge(type),2.);
60 Float_t bethe = Bethe(mom,type,isSA)*chargeFactor;
61 return (signal - bethe)/GetResolution(bethe,nPtsForPid,isSA,mom,type);
63 Int_t GetParticleIdFromdEdxVsP(Float_t mom, Float_t signal, Bool_t isSA=kFALSE) const;
68 // Data members for truncated mean method
69 Float_t fRes; // relative dEdx resolution
70 Double_t fKp1; // ALEPH BB param 1
71 Double_t fKp2; // ALEPH BB param 2
72 Double_t fKp3; // ALEPH BB param 3
73 Double_t fKp4; // ALEPH BB param 4
74 Double_t fKp5; // ALEPH BB param
75 Double_t fBBsa[5]; // parameters of BB for SA tracks
76 Double_t fBBsaHybrid[9]; // parameters of Hybrid BB for SA tracks, PHOB + Polinomial al low beta*gamma
77 Double_t fBBsaElectron[5];// parameters of electron BB for SA tracks
78 Double_t fBBtpcits[5]; // parameters of BB for TPC+ITS tracks
79 Double_t fBBdeu[5]; // parameters of deuteron BB for TPC+ITS tracks
80 Double_t fBBtri[5]; // parameters of triton BB for TPC+ITS tracks
81 Float_t fResolSA[5]; // resolutions vs. n. of SDD/SSD points
82 Float_t fResolTPCITS[5]; // resolutions vs. n. of SDD/SSD points
83 Double_t fResolTPCITSDeu3[3]; // deuteron resolutions vs. p for tracks with 3 SDD/SSD points
84 Double_t fResolTPCITSDeu4[3]; // deuteron resolutions vs. p for tracks with 4 SDD/SSD points
85 Double_t fResolTPCITSTri3[3]; // triton resolutions vs. p for tracks with 3 SDD/SSD points
86 Double_t fResolTPCITSTri4[3]; // triton resolutions vs. p for tracks with 4 SDD/SSD points
88 Double_t Bethe(Double_t bg, const Double_t * const par, Bool_t isNuclei) const;
89 ClassDef(AliITSPIDResponse,5) // ITS PID class