Added MakePID method the embryo of Bayesian PID with PHOS

[u/mrichter/AliRoot.git] / PHOS / AliPHOSRecParticle.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/
/* $Id$ */
//_________________________________________________________________________
//  A Reconstructed Particle in PHOS    
//  To become a general class of AliRoot ?       
//  Why should I put meaningless comments
//  just to satisfy
//  the code checker                 
//       
//*-- Author: Yves Schutz (SUBATECH)


// --- ROOT system ---

// --- Standard library ---


// --- AliRoot header files ---
#include "AliPHOSRecParticle.h"
#include "AliPHOSGetter.h" 

//____________________________________________________________________________
  AliPHOSRecParticle::AliPHOSRecParticle(): fPHOSTrackSegment(0)  ,  fDebug( kFALSE )
{
  // ctor
  const Int_t nSPECIES = AliESDtrack::kSPECIESN;
  for(Int_t i = 0; i<nSPECIES ; i++)
    fPID[i]=0.;
}


//____________________________________________________________________________
 AliPHOSRecParticle::AliPHOSRecParticle(const AliPHOSRecParticle & rp)
   : AliPHOSFastRecParticle(rp)
{
  // copy ctor

  fPHOSTrackSegment = rp.fPHOSTrackSegment ; 
  fDebug            = kFALSE ; 
  fType             = rp.fType ; 
  fIndexInList      = rp.fIndexInList ;

  fPdgCode     = rp.fPdgCode;
  fStatusCode  = rp.fStatusCode;
  fMother[0]   = rp.fMother[0];
  fMother[1]   = rp.fMother[1];
  fDaughter[0] = rp.fDaughter[0];
  fDaughter[1] = rp.fDaughter[1];
  fWeight      = rp.fWeight;
  fCalcMass    = rp.fCalcMass;
  fPx          = rp.fPx;
  fPy          = rp.fPy;
  fPz          = rp.fPz;
  fE           = rp.fE;
  fVx          = rp.fVx;
  fVy          = rp.fVy;
  fVz          = rp.fVz;
  fVt          = rp.fVt;
  fPolarTheta  = rp.fPolarTheta;
  fPolarPhi    = rp.fPolarPhi;
  fParticlePDG = rp.fParticlePDG; 
  const Int_t nSPECIES = AliESDtrack::kSPECIESN;
  for(Int_t i = 0; i<nSPECIES ; i++)
    fPID[i]=rp.fPID[i];
}

//____________________________________________________________________________
const Int_t AliPHOSRecParticle::GetNPrimaries() const  
{ 
  return -1;
}

//____________________________________________________________________________
const Int_t AliPHOSRecParticle::GetNPrimariesToRecParticles() const  
{ 
  // Get the number of primaries at the origine of the RecParticle
  Int_t rv = 0 ;
  AliPHOSGetter * gime = AliPHOSGetter::Instance() ; 
  Int_t emcRPindex = dynamic_cast<AliPHOSTrackSegment*>(gime->TrackSegments()->At(GetPHOSTSIndex()))->GetEmcIndex();
  dynamic_cast<AliPHOSEmcRecPoint*>(gime->EmcRecPoints()->At(emcRPindex))->GetPrimaries(rv) ; 
  return rv ; 
}

//____________________________________________________________________________
const TParticle * AliPHOSRecParticle::GetPrimary(Int_t index) const  
{
  // Get the list of primary particles at the origine of the RecParticle
  if ( index > GetNPrimariesToRecParticles() ) { 
    if (fDebug) 
      Warning("GetPrimary", "AliPHOSRecParticle::GetPrimary -> %d is larger that the number of primaries %d", 
	      index, GetNPrimaries()) ;
    return 0 ; 
  } 
  else { 
    Int_t dummy ; 
    AliPHOSGetter * gime = AliPHOSGetter::Instance() ; 

    Int_t emcRPindex = dynamic_cast<AliPHOSTrackSegment*>(gime->TrackSegments()->At(GetPHOSTSIndex()))->GetEmcIndex();
    Int_t primaryindex = dynamic_cast<AliPHOSEmcRecPoint*>(gime->EmcRecPoints()->At(emcRPindex))->GetPrimaries(dummy)[index] ; 
    return gime->Primary(primaryindex) ;
   } 
  //  return 0 ; 
}

//____________________________________________________________________________
const Double_t * AliPHOSRecParticle::GetPID()
{
  // Get the probability densities that this reconstructed particle
  // has a type of i:
  // i       particle types
  // ----------------------
  // 0       electron
  // 1       muon
  // 2       pi+-
  // 3       K+-
  // 4       p/pbar
  // 5       photon
  // 6       pi0 at high pt
  // 7       neutron
  // 8       K0L

 
  if (IsElectron()     ) fPID[0] = 1.0;
  if (IsChargedHadron()) {
    fPID[1] = 0.25;
    fPID[2] = 0.25;
    fPID[3] = 0.25;
    fPID[4] = 0.25;
  }
  if (IsFastChargedHadron()) {
    fPID[1] = 0.33;
    fPID[2] = 0.33;
    fPID[3] = 0.33;
    fPID[4] = 0.00;
  }
  if (IsSlowChargedHadron()) {
    fPID[1] = 0.00;
    fPID[2] = 0.00;
    fPID[3] = 0.00;
    fPID[4] = 1.00;
  }

  if (IsPhoton() || IsHardPhoton()) fPID[5] = 1.0;
  if (IsHardPi0())                  fPID[6] = 1.0;
  if (IsFastNeutralHadron())        fPID[7] = 1.0;
  if (IsSlowNeutralHadron())        fPID[8] = 1.0;

  if (IsEleCon()) fPID[9] = 1.0;
  return fPID;
}