1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
16 //-----------------------------------------------------------------//
18 // Implementation of the TOF PID class //
19 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch //
21 //-----------------------------------------------------------------//
26 #include "AliESDtrack.h"
27 #include "AliESDEvent.h"
29 #include "AliTOFpidESD.h"
31 ClassImp(AliTOFpidESD)
33 //_________________________________________________________________________
34 AliTOFpidESD::AliTOFpidESD():
41 //_________________________________________________________________________
42 AliTOFpidESD::AliTOFpidESD(Double_t *param):
49 // The main constructor
56 //_________________________________________________________________________
57 Int_t AliTOFpidESD::MakePID(AliESDEvent *event, Double_t timeZero)
60 // This function calculates the "detector response" PID probabilities
61 // Just for a bare hint...
63 AliDebug(1,Form("TOF PID Parameters: Sigma (ps)= %f, Range= %f",fSigma,fRange));
64 AliDebug(1,"++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \n");
65 Int_t ntrk=event->GetNumberOfTracks();
66 AliESDtrack **tracks=new AliESDtrack*[ntrk];
69 for (i=0; i<ntrk; i++) {
70 AliESDtrack *t=event->GetTrack(i);
74 for (i=0; i<ntrk; i++) {
75 AliESDtrack *t=tracks[i];
76 if ((t->GetStatus()&AliESDtrack::kTOFout)==0) continue;
77 if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue;
78 Double_t tof=t->GetTOFsignal()-timeZero;
79 Double_t time[10]; t->GetIntegratedTimes(time);
81 Double_t mom=t->GetP();
82 for (Int_t j=0; j<AliPID::kSPECIES; j++) {
83 Double_t mass=AliPID::ParticleMass(j);
84 Double_t dpp=0.01; //mean relative pt resolution;
85 if (mom>0.5) dpp=0.01*mom;
86 Double_t sigma=dpp*time[j]/(1.+ mom*mom/(mass*mass));
87 sigma=TMath::Sqrt(sigma*sigma + fSigma*fSigma);
88 if (TMath::Abs(tof-time[j]) > fRange*sigma) {
89 p[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
92 p[j]=TMath::Exp(-0.5*(tof-time[j])*(tof-time[j])/(sigma*sigma))/sigma;
102 //_________________________________________________________________________
103 Int_t AliTOFpidESD::MakePID(AliESDEvent *event)
106 // This function calculates the "detector response" PID probabilities
107 // Just for a bare hint...
109 Int_t ntrk=event->GetNumberOfTracks();
110 AliESDtrack **tracks=new AliESDtrack*[ntrk];
113 for (i=0; i<ntrk; i++) {
114 AliESDtrack *t=event->GetTrack(i);
118 for (i=0; i<ntrk; i++) {
119 AliESDtrack *t=tracks[i];
120 if ((t->GetStatus()&AliESDtrack::kTOFout)==0) continue;
121 if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue;
122 Double_t tof=t->GetTOFsignal();
123 Double_t time[10]; t->GetIntegratedTimes(time);
125 Double_t mom=t->GetP();
126 for (Int_t j=0; j<AliPID::kSPECIES; j++) {
127 Double_t mass=AliPID::ParticleMass(j);
128 Double_t dpp=0.01; //mean relative pt resolution;
129 if (mom>0.5) dpp=0.01*mom;
130 Double_t sigma=dpp*time[j]/(1.+ mom*mom/(mass*mass));
131 sigma=TMath::Sqrt(sigma*sigma + fSigma*fSigma);
132 if (TMath::Abs(tof-time[j]) > fRange*sigma) {
133 p[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
136 p[j]=TMath::Exp(-0.5*(tof-time[j])*(tof-time[j])/(sigma*sigma))/sigma;