AliAODRecoDecayHF2Prong.cxx

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 * Copyright(c) 1998-2006, ALICE Experiment at CERN, All rights reserved. *
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 * Author: The ALICE Off-line Project.                                    *
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 * documentation strictly for non-commercial purposes is hereby granted   *
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 * about the suitability of this software for any purpose. It is          *
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 **************************************************************************/

/* $Id$ */

//
// Base class for AOD reconstructed heavy-flavour 2-prong decay
//
// Author: A.Dainese, andrea.dainese@lnl.infn.it

#include <TDatabasePDG.h>
#include "AliAODRecoDecayHF.h"
#include "AliAODRecoDecayHF2Prong.h"
#include "AliAODRecoDecayHF3Prong.h"

ClassImp(AliAODRecoDecayHF2Prong);

//--------------------------------------------------------------------------
AliAODRecoDecayHF2Prong::AliAODRecoDecayHF2Prong() :
  AliAODRecoDecayHF()
{
  //
  //
}
//--------------------------------------------------------------------------
AliAODRecoDecayHF2Prong::AliAODRecoDecayHF2Prong(AliAODVertex *vtx2,
             Double_t *px,Double_t *py,Double_t *pz,
             Double_t *d0,Double_t *d0err,Float_t dca) :
  AliAODRecoDecayHF(vtx2,2,0,px,py,pz,d0,d0err)
{
  //
  //
  SetDCA(dca);
}
//--------------------------------------------------------------------------
AliAODRecoDecayHF2Prong::AliAODRecoDecayHF2Prong(AliAODVertex *vtx2,
             Double_t *d0,Double_t *d0err,Float_t dca) :
  AliAODRecoDecayHF(vtx2,2,0,d0,d0err)
{
  //
  //
  SetDCA(dca);
}
//--------------------------------------------------------------------------
AliAODRecoDecayHF2Prong::AliAODRecoDecayHF2Prong(const AliAODRecoDecayHF2Prong &source) :
  AliAODRecoDecayHF(source)
{
  //
  //
}
//--------------------------------------------------------------------------
AliAODRecoDecayHF2Prong &AliAODRecoDecayHF2Prong::operator=(const AliAODRecoDecayHF2Prong &source)
{
  //
  //
  if(&source == this) return *this;

  AliAODRecoDecayHF::operator=(source);

  return *this;
}
//--------------------------------------------------------------------------
Bool_t AliAODRecoDecayHF2Prong::SelectD0(const Double_t *cuts,Int_t &okD0,Int_t &okD0bar) 
  const {
  Double_t mD0,mD0bar,ctsD0,ctsD0bar;
  okD0=1; okD0bar=1;

  Double_t mD0PDG = TDatabasePDG::Instance()->GetParticle(421)->Mass();

  if(PtProng(1) < cuts[3] || PtProng(0) < cuts[4]) okD0 = 0;
  if(PtProng(0) < cuts[3] || PtProng(1) < cuts[4]) okD0bar = 0;
  if(!okD0 && !okD0bar) return kFALSE;

  if(TMath::Abs(Getd0Prong(1)) > cuts[5] || 
     TMath::Abs(Getd0Prong(0)) > cuts[6]) okD0 = 0;
  if(TMath::Abs(Getd0Prong(0)) > cuts[6] ||
     TMath::Abs(Getd0Prong(1)) > cuts[5]) okD0bar = 0;
  if(!okD0 && !okD0bar) return kFALSE;

  if(GetDCA() > cuts[1]) { okD0 = okD0bar = 0; return kFALSE; }

  InvMassD0(mD0,mD0bar);
  if(TMath::Abs(mD0-mD0PDG)    > cuts[0]) okD0 = 0;
  if(TMath::Abs(mD0bar-mD0PDG) > cuts[0]) okD0bar = 0;
  if(!okD0 && !okD0bar) return kFALSE;

  CosThetaStarD0(ctsD0,ctsD0bar);
  if(TMath::Abs(ctsD0)    > cuts[2]) okD0 = 0;
  if(TMath::Abs(ctsD0bar) > cuts[2]) okD0bar = 0;
  if(!okD0 && !okD0bar) return kFALSE;

  if(Prodd0d0() > cuts[7]) { okD0 = okD0bar = 0; return kFALSE; }

  if(CosPointingAngle()   < cuts[8]) { okD0 = okD0bar = 0; return kFALSE; }

  return kTRUE;
}
//-----------------------------------------------------------------------------
Bool_t AliAODRecoDecayHF2Prong::SelectBtoJPSI(const Double_t *cuts,Int_t &okB)
  const {
  Double_t mJPsi,ctsJPsi;
  okB=1;

  Double_t mJPSIPDG = TDatabasePDG::Instance()->GetParticle(443)->Mass();

  if(PtProng(1) < cuts[3] || PtProng(0) < cuts[4]) okB = 0;
  if(!okB) return kFALSE;

  if(TMath::Abs(Getd0Prong(1)) > cuts[5] ||
     TMath::Abs(Getd0Prong(0)) > cuts[6]) okB = 0;
  if(!okB) return kFALSE;

  if(GetDCA() > cuts[1]) { okB = 0; return kFALSE; }

  mJPsi=InvMassJPSIee();
  if(TMath::Abs(mJPsi-mJPSIPDG)    > cuts[0]) okB = 0;
  if(!okB) return kFALSE;

  ctsJPsi=CosThetaStarJPSI();
  if(TMath::Abs(ctsJPsi)    > cuts[2]) okB = 0;
  if(!okB) return kFALSE;

  if(Prodd0d0() > cuts[7]) { okB = 0; return kFALSE; }

  if(CosPointingAngle()   < cuts[8]) { okB = 0; return kFALSE; }

  return kTRUE;
}
//-----------------------------------------------------------------------------
Int_t AliAODRecoDecayHF2Prong::MatchToMCB3Prong(Int_t pdgabs,Int_t pdgabs3prong, Int_t *pdgBDg,Int_t *pdgDg3prong, TClonesArray *mcArray) const
{
  //std::cout<<"MCmatch 1"<<std::endl;
  //
  // Check if this candidate is matched to a MC signal
  // If no, return -1
  // If yes, return label (>=0) of the AliAODMCParticle
  // 
  Int_t ndg=GetNDaughters();
  if(ndg==0) {
    AliError("No daughters available");
    return -1;
  }
  if(ndg>10){
    AliError("Only decays with <10 daughters supported");
    return -1;
  }
  

 

  AliAODRecoDecayHF3Prong *DDaughter = (AliAODRecoDecayHF3Prong*)GetDaughter(0);
  if(!DDaughter)return -1;
  Int_t DLabel = DDaughter->MatchToMC(pdgabs3prong,mcArray,3,pdgDg3prong);
  if(DLabel<0) return -1;

  Int_t dgLabels[10]={0};


  // loop on daughters and write labels
  for(Int_t i=0; i<ndg; i++) {
    AliVTrack *trk = (AliVTrack*)GetDaughter(i);
    Int_t lab = trk->GetLabel();
    if(lab==-1) { // this daughter is the 3prong
      lab=DLabel;
    } else if(lab<-1) {
      printf("daughter with negative label\n");
      continue;
    }
    dgLabels[i] = lab;
    
  }
 
  
  Int_t label = MatchToMC(pdgabs,mcArray,dgLabels,ndg,2,pdgBDg);
  


  return label;

}