New class AliESDEvent, backward compatibility with the old AliESD (Christian)

[u/mrichter/AliRoot.git] / TOF / AliTOFpidESD.cxx

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 * Author: The ALICE Off-line Project.                                    *
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 * provided "as is" without express or implied warranty.                  *
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//-----------------------------------------------------------------//
//                                                                 //
//           Implementation of the TOF PID class                   //
//      Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch         //
//                                                                 //
//-----------------------------------------------------------------//

#include "TMath.h"
#include "AliLog.h"

#include "AliESDtrack.h"
#include "AliESDEvent.h"

#include "AliTOFpidESD.h"

ClassImp(AliTOFpidESD)

//_________________________________________________________________________
  AliTOFpidESD::AliTOFpidESD(): 
  fN(-1),
  fEventN(-1),
  fSigma(0),
  fRange(0)
{
}
//_________________________________________________________________________
AliTOFpidESD::AliTOFpidESD(Double_t *param):
  fN(0),
  fEventN(0),
  fSigma(0),
  fRange(0)
 {
  //
  //  The main constructor
  //
  fSigma=param[0];
  fRange=param[1];

}

//_________________________________________________________________________
Int_t AliTOFpidESD::MakePID(AliESDEvent *event, Double_t timeZero)
{
  //
  //  This function calculates the "detector response" PID probabilities
  //                Just for a bare hint... 

  AliDebug(1,Form("TOF PID Parameters: Sigma (ps)= %f, Range= %f",fSigma,fRange));
  AliDebug(1,"++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ \n");
  Int_t ntrk=event->GetNumberOfTracks();
  AliESDtrack **tracks=new AliESDtrack*[ntrk];

  Int_t i;
  for (i=0; i<ntrk; i++) {
    AliESDtrack *t=event->GetTrack(i);
    tracks[i]=t;
  }

  for (i=0; i<ntrk; i++) {
    AliESDtrack *t=tracks[i];
    if ((t->GetStatus()&AliESDtrack::kTOFout)==0) continue;
    if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue;
    Double_t tof=t->GetTOFsignal()-timeZero;
    Double_t time[10]; t->GetIntegratedTimes(time);
    Double_t p[10];
    Double_t mom=t->GetP();
    for (Int_t j=0; j<AliPID::kSPECIES; j++) {
      Double_t mass=AliPID::ParticleMass(j);
      Double_t dpp=0.01;      //mean relative pt resolution;
      if (mom>0.5) dpp=0.01*mom;
      Double_t sigma=dpp*time[j]/(1.+ mom*mom/(mass*mass));
      sigma=TMath::Sqrt(sigma*sigma + fSigma*fSigma);
      if (TMath::Abs(tof-time[j]) > fRange*sigma) {
	p[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
        continue;
      }
      p[j]=TMath::Exp(-0.5*(tof-time[j])*(tof-time[j])/(sigma*sigma))/sigma;
    }
    t->SetTOFpid(p);
  }

  delete[] tracks;
  
  return 0;
}

//_________________________________________________________________________
Int_t AliTOFpidESD::MakePID(AliESDEvent *event)
{
  //
  //  This function calculates the "detector response" PID probabilities
  //                Just for a bare hint... 

  Int_t ntrk=event->GetNumberOfTracks();
  AliESDtrack **tracks=new AliESDtrack*[ntrk];

  Int_t i;
  for (i=0; i<ntrk; i++) {
    AliESDtrack *t=event->GetTrack(i);
    tracks[i]=t;
  }

  for (i=0; i<ntrk; i++) {
    AliESDtrack *t=tracks[i];
    if ((t->GetStatus()&AliESDtrack::kTOFout)==0) continue;
    if ((t->GetStatus()&AliESDtrack::kTIME)==0) continue;
    Double_t tof=t->GetTOFsignal();
    Double_t time[10]; t->GetIntegratedTimes(time);
    Double_t p[10];
    Double_t mom=t->GetP();
    for (Int_t j=0; j<AliPID::kSPECIES; j++) {
      Double_t mass=AliPID::ParticleMass(j);
      Double_t dpp=0.01;      //mean relative pt resolution;
      if (mom>0.5) dpp=0.01*mom;
      Double_t sigma=dpp*time[j]/(1.+ mom*mom/(mass*mass));
      sigma=TMath::Sqrt(sigma*sigma + fSigma*fSigma);
      if (TMath::Abs(tof-time[j]) > fRange*sigma) {
	p[j]=TMath::Exp(-0.5*fRange*fRange)/sigma;
        continue;
      }
      p[j]=TMath::Exp(-0.5*(tof-time[j])*(tof-time[j])/(sigma*sigma))/sigma;
    }
    t->SetTOFpid(p);
  }

  delete[] tracks;
  
  return 0;
}