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 //-----------------------------------------------------------------
17 // Implementation of the TOF PID class
18 // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch
19 //-----------------------------------------------------------------
21 #include "AliTOFpidESD.h"
22 #include "AliESDtrack.h"
25 ClassImp(AliTOFpidESD)
27 //_________________________________________________________________________
28 AliTOFpidESD::AliTOFpidESD(Double_t *param) {
30 // The main constructor
39 //_________________________________________________________________________
40 Int_t AliTOFpidESD::MakePID(AliESD *event)
43 // This function calculates the "detector response" PID probabilities
44 // Just for a bare hint...
46 Int_t ntrk=event->GetNumberOfTracks();
47 AliESDtrack **tracks=new AliESDtrack*[ntrk];
50 for (i=0; i<ntrk; i++) {
51 AliESDtrack *t=event->GetTrack(i);
55 for (i=0; i<ntrk; i++) {
56 AliESDtrack *t=tracks[i];
57 if ((t->GetStatus()&AliESDtrack::kTOFout)==0) continue;
58 if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue;
59 Double_t tof=t->GetTOFsignal();
60 Double_t time[10]; t->GetIntegratedTimes(time);
62 Double_t mom=t->GetP();
63 for (Int_t j=0; j<AliPID::kSPECIES; j++) {
64 Double_t mass=AliPID::ParticleMass(j);
65 Double_t dpp=0.01; //mean relative pt resolution;
66 if (mom>0.5) dpp=0.01*mom;
67 Double_t sigma=dpp*time[j]/(1.+ mom*mom/(mass*mass));
68 sigma=TMath::Sqrt(sigma*sigma + fSigma*fSigma);
69 if (TMath::Abs(tof-time[j]) > fRange*sigma) {
70 p[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
73 p[j]=TMath::Exp(-0.5*(tof-time[j])*(tof-time[j])/(sigma*sigma))/sigma;