AliAODRecoDecayHF4Prong.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.                                    *
 * Contributors are mentioned in the code where appropriate.              *
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 * documentation strictly for non-commercial purposes is hereby granted   *
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 * 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.                  *
 **************************************************************************/

/* $Id$ */

//
// Base class for AOD reconstructed heavy-flavour 4-prong decay
//
// Authors: G.E.Bruno Giuseppe.Bruno@to.infn.it, R.Romita Rossella.Romita@ba.infn.it

#include <TDatabasePDG.h>
#include "AliAODRecoDecayHF.h"
#include "AliAODRecoDecayHF4Prong.h"

ClassImp(AliAODRecoDecayHF4Prong);

//--------------------------------------------------------------------------
AliAODRecoDecayHF4Prong::AliAODRecoDecayHF4Prong() :
  AliAODRecoDecayHF(), 
  fDist12toPrim(0),
  fDist3toPrim(0),
  fDist4toPrim(0)
{
  //
  //
}
//--------------------------------------------------------------------------
AliAODRecoDecayHF4Prong::AliAODRecoDecayHF4Prong(AliAODVertex *vtx2,
             Double_t *px,Double_t *py,Double_t *pz,
             Double_t *d0,Double_t *d0err,
             Double_t *dca, //Double_t sigvert,
             Double_t dist12,Double_t dist3,
             Double_t dist4,
             Short_t charge) :
  AliAODRecoDecayHF(vtx2,4,charge,px,py,pz,d0,d0err),
  // fSigmaVert(sigvert),
  fDist12toPrim(dist12),
  fDist3toPrim(dist3),
  fDist4toPrim(dist4)
{
  //
  //
  SetDCAs(6,dca);
}
//--------------------------------------------------------------------------
AliAODRecoDecayHF4Prong::AliAODRecoDecayHF4Prong(AliAODVertex *vtx2,
             Double_t *d0,Double_t *d0err,
             Double_t *dca, //Double_t sigvert,
             Double_t dist12,Double_t dist3, 
             Double_t dist4, 
             Short_t charge) :
  AliAODRecoDecayHF(vtx2,4,charge,d0,d0err),
  //fSigmaVert(sigvert),
  fDist12toPrim(dist12),
  fDist3toPrim(dist3),
  fDist4toPrim(dist4)
{
  //
  //
  SetDCAs(6,dca);
}
//--------------------------------------------------------------------------
AliAODRecoDecayHF4Prong::AliAODRecoDecayHF4Prong(const AliAODRecoDecayHF4Prong &source) :
  AliAODRecoDecayHF(source),
  //fSigmaVert(source.fSigmaVert),
  fDist12toPrim(source.fDist12toPrim),
  fDist3toPrim(source.fDist3toPrim),
  fDist4toPrim(source.fDist4toPrim)
{
  //
  //
}
//--------------------------------------------------------------------------
AliAODRecoDecayHF4Prong &AliAODRecoDecayHF4Prong::operator=(const AliAODRecoDecayHF4Prong &source)
{
  //
  //
  if(&source == this) return *this;

  AliAODRecoDecayHF::operator=(source);

  fDist12toPrim= source.fDist12toPrim;
  fDist3toPrim= source.fDist3toPrim;
  fDist4toPrim= source.fDist4toPrim;
  //fSigmaVert= source.fSigmaVert;

  return *this;
}
//--------------------------------------------------------------------------
void AliAODRecoDecayHF4Prong::InvMassD0(Double_t mD0[2]) const {
  //
  //
  UInt_t pdg[4];
  pdg[0]=211; pdg[1]=321; pdg[2]=211; pdg[3]=211;
  mD0[0]=InvMass(4,pdg);
  pdg[1]=211; pdg[3]=321;
  mD0[1]=InvMass(4,pdg);
  
  return;
}
//--------------------------------------------------------------------------
void AliAODRecoDecayHF4Prong::InvMassD0bar(Double_t mD0bar[2]) const {
  //
  //
  UInt_t pdg[4];
  pdg[0]=321; pdg[1]=211; pdg[2]=211; pdg[3]=211;
  mD0bar[0]=InvMass(4,pdg);
  pdg[0]=211; pdg[2]=321;
  mD0bar[1]=InvMass(4,pdg);
  
  return;
}
//--------------------------------------------------------------------------

Bool_t AliAODRecoDecayHF4Prong::SelectD0(const Double_t *cuts,Int_t &okD0,Int_t &okD0bar) const
{
  
  okD0=0; okD0bar=0;
  Double_t mD0PDG = TDatabasePDG::Instance()->GetParticle(421)->Mass();
  Double_t mD0[2];
  Double_t mD0bar[2];
  InvMassD0(mD0);
  InvMassD0bar(mD0bar);
  Bool_t goodMass=kFALSE;
  if(TMath::Abs(mD0[0]-mD0PDG)<=cuts[0]) {goodMass=kTRUE; okD0=1;}
  if(TMath::Abs(mD0[1]-mD0PDG)<=cuts[0]) {goodMass=kTRUE; okD0=1;}
  if(TMath::Abs(mD0bar[0]-mD0PDG)<=cuts[0]) {goodMass=kTRUE; okD0bar=1;}
  if(TMath::Abs(mD0bar[1]-mD0PDG)<=cuts[0]) {goodMass=kTRUE; okD0bar=1;}
  if(!goodMass) return kFALSE;
  
  //DCA btw opposite sign tracks
  if(cuts[1]>0.){
    if(GetDCA(0)>cuts[1]) return kFALSE;
    if(GetDCA(1)>cuts[1]) return kFALSE;
    if(GetDCA(2)>cuts[1]) return kFALSE;
    if(GetDCA(3)>cuts[1]) return kFALSE;
    if(GetDCA(4)>cuts[1]) return kFALSE;
    if(GetDCA(5)>cuts[1]) return kFALSE;
  }
  //2track cuts
  if(cuts[2]>0.){
    if(fDist12toPrim>10.)return kFALSE;
    if(fDist12toPrim<cuts[2])return kFALSE;
  }
  //3track cuts
  if(cuts[3]>0.){
    if(fDist3toPrim<cuts[3])return kFALSE;
  }
  //4track cuts
  if(cuts[4]>0.){
    if(fDist4toPrim<cuts[4])return kFALSE;
  }
  if(cuts[5]>-1.1){
    if(CosPointingAngle()<cuts[5])return kFALSE;
  }
  if(cuts[6]>0.){
    if(Pt()<cuts[6])return kFALSE;
  }
  if(cuts[7]>0.){
    Double_t massD0[2];
    Double_t massD0bar[2];
    Bool_t good=CutRhoMass(massD0,massD0bar,cuts[0],cuts[7]);
    if(!good) return kFALSE;
  }
  
  return kTRUE;
}
//----------------------------------------------------------------------------
Bool_t AliAODRecoDecayHF4Prong::CutRhoMass(Double_t massD0[2],Double_t massD0bar[2],Double_t cutMass,Double_t cutRho) const 
{
  //
  //
  Bool_t isGood=kFALSE;
  Int_t nprongs=4;
  for(Int_t i=0;i<2;i++){massD0[i]=0.;massD0bar[i]=0.;}
  Bool_t isRho=kFALSE;
  Bool_t isTrue=kFALSE;
  Double_t mPDG=TDatabasePDG::Instance()->GetParticle(421)->Mass();
  Double_t mPDGRho=TDatabasePDG::Instance()->GetParticle(113)->Mass();
  Double_t minv01=InvMassRho(0,1);
  if(TMath::Abs(minv01-mPDGRho)<cutRho) isRho=kTRUE;
  if(isRho){
    UInt_t pdg1[4]={211,211,321,211};
    Double_t mass1=InvMass(nprongs,pdg1);
    if(TMath::Abs(mass1-mPDG)<cutMass) {isTrue=kTRUE;isGood=kTRUE;}
    if(isTrue) massD0bar[1]=mass1;
    isTrue=kFALSE;
    UInt_t pdg2[4]={211,211,211,321};
    Double_t mass2=InvMass(4,pdg2);
    if(TMath::Abs(mass2-mPDG)<cutMass) {isTrue=kTRUE;isGood=kTRUE;}
    if(isTrue) massD0[1]=mass2;
    isTrue=kFALSE;
  }
  Double_t minv03=InvMassRho(0,3);
  if(TMath::Abs(minv03-mPDGRho)<cutRho) isRho=kTRUE;
  if(isRho){
    UInt_t pdg1[4]={211,211,321,211};
    Double_t mass1=InvMass(4,pdg1);
    if(TMath::Abs(mass1-mPDG)<cutMass) {isTrue=kTRUE;isGood=kTRUE;}
    if(isTrue) massD0bar[1]=mass1;
    isTrue=kFALSE;
    UInt_t pdg2[4]={211,321,211,211};
    Double_t mass2=InvMass(4,pdg2);
    if(TMath::Abs(mass2-mPDG)<cutMass) {isTrue=kTRUE;isGood=kTRUE;}
    if(isTrue) massD0[0]=mass2;
    isTrue=kFALSE;
  }
  Double_t minv12=InvMassRho(1,2);
  if(TMath::Abs(minv12-mPDGRho)<cutRho) isRho=kTRUE;
  if(isRho){
    UInt_t pdg1[4]={321,211,211,211};
    Double_t mass1=InvMass(4,pdg1);
    if(TMath::Abs(mass1-mPDG)<cutMass) {isTrue=kTRUE;isGood=kTRUE;}
    if(isTrue) massD0bar[0]=mass1;
    isTrue=kFALSE;
    UInt_t pdg2[4]={211,211,211,321};
    Double_t mass2=InvMass(4,pdg2);
    if(TMath::Abs(mass2-mPDG)<cutMass) {isTrue=kTRUE;isGood=kTRUE;}
    if(isTrue) massD0[1]=mass2;
    isTrue=kFALSE;
  }
  Double_t minv23=InvMassRho(2,3);
  if(TMath::Abs(minv23-mPDGRho)<cutRho) isRho=kTRUE;
  if(isRho){
    UInt_t pdg1[4]={321,211,211,211};
    Double_t mass1=InvMass(4,pdg1);
    if(TMath::Abs(mass1-mPDG)<cutMass) {isTrue=kTRUE;isGood=kTRUE;}
    if(isTrue) massD0bar[0]=mass1;
    isTrue=kFALSE;
    UInt_t pdg2[4]={211,321,211,211};
    Double_t mass2=InvMass(4,pdg2);
    if(TMath::Abs(mass2-mPDG)<cutMass) {isTrue=kTRUE;isGood=kTRUE;}
    if(isTrue) massD0[0]=mass2;
    isTrue=kFALSE;
  }
  return isGood;
}