AliCFVertexingHF2Prong.cxx

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//-----------------------------------------------------------------------
// Class for HF corrections as a function of many variables and step 
// Author : C. Zampolli, CERN
// D. Caffarri, Univ & INFN Padova caffarri@pd.infn.it
// Base class for HF Unfolding - agrelli@uu.nl
//-----------------------------------------------------------------------

#include "AliAODRecoDecayHF2Prong.h"
#include "AliAODMCParticle.h"
#include "AliAODEvent.h"
#include "TClonesArray.h"
#include "AliCFVertexingHF.h"
#include "AliESDtrack.h"
#include "TDatabasePDG.h"

#include "AliCFVertexingHF2Prong.h"
#include "AliCFContainer.h"
#include "AliCFTaskVertexingHF.h"

ClassImp(AliCFVertexingHF2Prong);

//_________________________________________
  AliCFVertexingHF2Prong::AliCFVertexingHF2Prong(TClonesArray *mcArray, UShort_t originDselection):
    AliCFVertexingHF(mcArray, originDselection)
{ 
  //
  // constructor
  //

  SetNProngs(2);
  fPtAccCut=new Float_t[fProngs];
  fEtaAccCut=new Float_t[fProngs];
  for(Int_t iP=0; iP<fProngs; iP++){
    fPtAccCut[iP]=0.1;
    fEtaAccCut[iP]=0.9;
  }

}


//_____________________________________
AliCFVertexingHF2Prong& AliCFVertexingHF2Prong::operator=(const AliCFVertexingHF2Prong& c)
{
  //
  // copy constructor 
  //

  if  (this != &c) {    
    AliCFVertexingHF::operator=(c);   
  }
  return *this;
}

//__________________________________________
Bool_t AliCFVertexingHF2Prong::SetRecoCandidateParam(AliAODRecoDecayHF *recoCand)
{  
  //
  // setting the recontructed candidate
  //
  
  Bool_t bSignAssoc = kFALSE; 
  fRecoCandidate = recoCand;
  if (!fRecoCandidate) {
    AliError("fRecoCandidate not found, problem in assignement\n");
    return bSignAssoc;
  }
  
  if (fRecoCandidate->GetPrimaryVtx()) AliDebug(3,"fReco Candidate has a pointer to PrimVtx\n");
  if (recoCand->GetPrimaryVtx()) AliDebug(3,"Reco Cand has a pointer to PrimVtx\n");
  
  Int_t pdgCand = 421;
  Int_t pdgDgD0toKpi[2]={321,211};
  Int_t nentries = fmcArray->GetEntriesFast();  

  AliDebug(3,Form("nentries = %d\n", nentries));
 
  Int_t mcLabel = fRecoCandidate->MatchToMC(pdgCand,fmcArray,2,pdgDgD0toKpi);
  if (mcLabel == -1) return bSignAssoc;

  if (fRecoCandidate->NumberOfFakeDaughters()>0){
    fFake = 0;    // fake candidate
    if (fFakeSelection==1) return bSignAssoc;
  }
  if (fRecoCandidate->NumberOfFakeDaughters()==0){
    fFake = 2;    // non-fake candidate
    if (fFakeSelection==2) return bSignAssoc;
  }

  SetMCLabel(mcLabel);
  fmcPartCandidate = dynamic_cast<AliAODMCParticle*>(fmcArray->At(fmcLabel));
  if (!fmcPartCandidate){
    AliDebug(3,"No part candidate");
    return bSignAssoc;
  } 
  bSignAssoc = kTRUE;
  return bSignAssoc;
}

//______________________________________________
Bool_t AliCFVertexingHF2Prong::GetGeneratedValuesFromMCParticle(Double_t* vectorMC) 
{
  // 
  // collecting all the necessary info (pt, y, cosThetaStar, ptPi, ptKa, cT) from MC particle
  //
  
  Bool_t bGenValues = kFALSE;
  Double_t vtx1[3] = {0,0,0};   // primary vertex   
  Double_t vtx2daughter0[3] = {0,0,0};   // secondary vertex from daughter 0
  Double_t vtx2daughter1[3] = {0,0,0};   // secondary vertex from daughter 1
  fmcPartCandidate->XvYvZv(vtx1);  // cm

  Int_t daughter0 = fmcPartCandidate->GetDaughter(0);
  Int_t daughter1 = fmcPartCandidate->GetDaughter(1);
  AliAODMCParticle* mcPartDaughter0 = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughter0));
  AliAODMCParticle* mcPartDaughter1 = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughter1));
  if(!mcPartDaughter0 || !mcPartDaughter1) return bGenValues;

  // getting vertex from daughters
  mcPartDaughter0->XvYvZv(vtx2daughter0);  // cm
  mcPartDaughter1->XvYvZv(vtx2daughter1);  //cm
  if (TMath::Abs(vtx2daughter0[0] - vtx2daughter1[0]) > 1E-5 || TMath::Abs(vtx2daughter0[1] - vtx2daughter1[1]) > 1E-5 || TMath::Abs(vtx2daughter0[2] - vtx2daughter1[2])>1E-5) {
    AliError("Daughters have different secondary vertex, skipping the track");
    return bGenValues;
  }
  
  Int_t nprongs = 2;
  Short_t charge = 0;
  // always instantiate the AliAODRecoDecay with the positive daughter first, the negative second
  AliAODMCParticle* positiveDaugh = mcPartDaughter0;
  AliAODMCParticle* negativeDaugh = mcPartDaughter1;
  if (mcPartDaughter0->GetPdgCode()<0 && mcPartDaughter1->GetPdgCode()>0){
    // inverting in case the positive daughter is the second one
    positiveDaugh = mcPartDaughter1;
    negativeDaugh = mcPartDaughter0;
  }
  // getting the momentum from the daughters
  Double_t px[2] = {positiveDaugh->Px(), negativeDaugh->Px()};    
  Double_t py[2] = {positiveDaugh->Py(), negativeDaugh->Py()};    
  Double_t pz[2] = {positiveDaugh->Pz(), negativeDaugh->Pz()};
  
  Double_t d0[2] = {0.,0.};   
  
  AliAODRecoDecayHF* decay = new AliAODRecoDecayHF(vtx1,vtx2daughter0,nprongs,charge,px,py,pz,d0);
  
  Double_t cosThetaStar = 0.;
  Double_t cosThetaStarD0 = 0.;
  Double_t cosThetaStarD0bar = 0.;
  cosThetaStarD0 = decay->CosThetaStar(1,421,211,321);
  cosThetaStarD0bar = decay->CosThetaStar(0,421,321,211);
  if (fmcPartCandidate->GetPdgCode() == 421){  // D0
    AliDebug(3, Form("D0, with pdgprong0 = %d, pdgprong1 = %d",mcPartDaughter0->GetPdgCode(),mcPartDaughter1->GetPdgCode()));
    cosThetaStar = cosThetaStarD0;
  }
  else if (fmcPartCandidate->GetPdgCode() == -421){  // D0bar{
    AliDebug(3, Form("D0bar, with pdgprong0 = %d, pdgprong1 = %d",mcPartDaughter0->GetPdgCode(),mcPartDaughter1->GetPdgCode()));
    cosThetaStar = cosThetaStarD0bar;
  }
  else{
    AliWarning("There are problems!! particle was expected to be either a D0 or a D0bar, check...");
    delete decay;
    return bGenValues;
  }
  if (cosThetaStar < -1 || cosThetaStar > 1) {
    AliWarning("Invalid value for cosine Theta star, returning");
    delete decay;
    return bGenValues;
  }
    
  //ct
  Double_t cT = decay->Ct(421);
  // get the pT of the daughters
  Double_t pTpi = 0.;
  Double_t pTK = 0.;
  
  if (TMath::Abs(mcPartDaughter0->GetPdgCode()) == 211) {
    pTpi = mcPartDaughter0->Pt();
    pTK = mcPartDaughter1->Pt();
  }
  else {
    pTpi = mcPartDaughter1->Pt();
    pTK = mcPartDaughter0->Pt();
  }
  
  switch (fConfiguration){
  case AliCFTaskVertexingHF::kSnail:
    vectorMC[0] = fmcPartCandidate->Pt();
    vectorMC[1] = fmcPartCandidate->Y() ;
    vectorMC[2] = cosThetaStar ;
    vectorMC[3] = pTpi ;
    vectorMC[4] = pTK ;
    vectorMC[5] = cT*1.E4 ;  // in micron
    vectorMC[6] = 0.;   // dummy value for dca, meaningless in MC
    vectorMC[7] = -80000.; // dummy value for d0pixd0K, meaningless in MC, in micron^2
    vectorMC[8] = 1.01;    // dummy value for cosPointing, meaningless in MC
    vectorMC[9] = fmcPartCandidate->Phi(); 
    vectorMC[10] = fzMCVertex;    // z of reconstructed of primary vertex
    vectorMC[11] = fCentValue;   //reconstructed centrality 
    vectorMC[12] = 1.;           // fake: always filling with 1 at MC level 
    vectorMC[13] = 1.01; // dummy value for cosPointingXY  multiplicity
    vectorMC[14] = 0.; // dummy value for NormalizedDecayLengthXY multiplicity
    vectorMC[15] = fMultiplicity; // reconstructed multiplicity
    break;
  case AliCFTaskVertexingHF::kCheetah:
    vectorMC[0] = fmcPartCandidate->Pt();
    vectorMC[1] = fmcPartCandidate->Y() ;
    vectorMC[2] = cT*1.E4; // in micron
    vectorMC[3] = fmcPartCandidate->Phi();
    vectorMC[4] = fzMCVertex;
    vectorMC[5] = fCentValue;   // dummy value for dca, meaningless in MC
    vectorMC[6] = 1. ;  // fake: always filling with 1 at MC level 
    vectorMC[7] = fMultiplicity;   // dummy value for d0pi, meaningless in MC, in micron
    break;
  }
  delete decay;
  bGenValues = kTRUE;
  return bGenValues;
}
//____________________________________________
Bool_t AliCFVertexingHF2Prong::GetRecoValuesFromCandidate(Double_t *vectorReco) const
{
  //
  // Getting the reconstructed values from the candidate
  // 
  
  Bool_t bFillRecoValues=kFALSE;
  
  AliAODRecoDecayHF2Prong *d0toKpi = (AliAODRecoDecayHF2Prong*)fRecoCandidate;
  
  if (d0toKpi->GetPrimaryVtx())AliDebug(3,"d0toKpi has primary vtx\n");
  if (fRecoCandidate->GetPrimaryVtx())AliDebug(3,"fRecoCandidate has primary vtx\n");
  
  Double_t pt = d0toKpi->Pt();
  Double_t rapidity = d0toKpi->YD0();
  Double_t invMass=0.;
  Double_t cosThetaStar = 9999.;
  Double_t pTpi = 0.;
  Double_t pTK = 0.;
  Double_t dca = d0toKpi->GetDCA();
  Double_t d0pi = 0.;
  Double_t d0K = 0.;
  Double_t d0xd0 = d0toKpi->Prodd0d0();
  Double_t cosPointingAngle = d0toKpi->CosPointingAngle();
  Double_t phi = d0toKpi->Phi();
  Int_t pdgCode = fmcPartCandidate->GetPdgCode();
  Double_t cosPointingAngleXY = d0toKpi->CosPointingAngleXY();
  Double_t normDecayLengthXY = d0toKpi->NormalizedDecayLengthXY();
       
  if (pdgCode > 0){
    cosThetaStar = d0toKpi->CosThetaStarD0();
    pTpi = d0toKpi->PtProng(0);
    pTK = d0toKpi->PtProng(1);
    d0pi = d0toKpi->Getd0Prong(0);
    d0K = d0toKpi->Getd0Prong(1);
    invMass=d0toKpi->InvMassD0();
  }
  else {
    cosThetaStar = d0toKpi->CosThetaStarD0bar();
    pTpi = d0toKpi->PtProng(1);
    pTK = d0toKpi->PtProng(0);
    d0pi = d0toKpi->Getd0Prong(1);
    d0K = d0toKpi->Getd0Prong(0);
    invMass= d0toKpi->InvMassD0bar();
  }
  
  Double_t cT = d0toKpi->CtD0();  
  
  switch (fConfiguration){
  case AliCFTaskVertexingHF::kSnail:
    vectorReco[0] = pt;
    vectorReco[1] = rapidity;
    vectorReco[2] = cosThetaStar;
    vectorReco[3] = pTpi;
    vectorReco[4] = pTK;
    vectorReco[5] = cT*1.E4;  // in micron
    vectorReco[6] = dca*1.E4;  // in micron
    vectorReco[7] = d0xd0*1.E8;  // in micron^2
    vectorReco[8] = cosPointingAngle; 
    vectorReco[9] = phi;  
    vectorReco[10] = fzPrimVertex;    // z of reconstructed of primary vertex
    vectorReco[11] = fCentValue; //reconstructed centrality 
    vectorReco[12] = fFake;      // whether the reconstructed candidate was a fake (fFake = 0) or not (fFake = 2) 
    vectorReco[13] = cosPointingAngleXY; 
    vectorReco[14] = normDecayLengthXY; // in cm
    vectorReco[15] = fMultiplicity; // reconstructed multiplicity
    break;
  case AliCFTaskVertexingHF::kCheetah:
    vectorReco[0] = pt;
    vectorReco[1] = rapidity ;
    vectorReco[2] = cT*1.E4; // in micron
    vectorReco[3] = phi; 
    vectorReco[4] = fzPrimVertex;
    vectorReco[5] = fCentValue;   
    vectorReco[6] = fFake ; 
    vectorReco[7] = fMultiplicity;  
    break;
  }

  bFillRecoValues = kTRUE;

  return bFillRecoValues;
}

//_____________________________________________________________
Bool_t AliCFVertexingHF2Prong::CheckMCChannelDecay() const
{ 
  //
  // checking the MC decay channel
  //
  Bool_t checkCD = kFALSE;
  Int_t daughter0 = fmcPartCandidate->GetDaughter(0);
  Int_t daughter1 = fmcPartCandidate->GetDaughter(1);
  AliAODMCParticle* mcPartDaughter0 = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughter0));
  AliAODMCParticle* mcPartDaughter1 = dynamic_cast<AliAODMCParticle*>(fmcArray->At(daughter1));
  
  if (!mcPartDaughter0 || !mcPartDaughter1) {
    AliDebug (2,"Problems in the MC Daughters\n");
    return checkCD;
  }
  
  if (!(TMath::Abs(mcPartDaughter0->GetPdgCode())==321 &&
        TMath::Abs(mcPartDaughter1->GetPdgCode())==211) && 
      !(TMath::Abs(mcPartDaughter0->GetPdgCode())==211 &&
        TMath::Abs(mcPartDaughter1->GetPdgCode())==321)) {
    AliDebug(2, "The D0 MC doesn't come from a Kpi decay, skipping!!");
    return checkCD;  
  }

  Double_t sumPxDau=mcPartDaughter0->Px()+mcPartDaughter1->Px();
  Double_t sumPyDau=mcPartDaughter0->Py()+mcPartDaughter1->Py();
  Double_t sumPzDau=mcPartDaughter0->Pz()+mcPartDaughter1->Pz();
  Double_t pxMother=fmcPartCandidate->Px();
  Double_t pyMother=fmcPartCandidate->Py();
  Double_t pzMother=fmcPartCandidate->Pz();
  if(TMath::Abs(pxMother-sumPxDau)/(TMath::Abs(pxMother)+1.e-13)>0.00001 ||
     TMath::Abs(pyMother-sumPyDau)/(TMath::Abs(pyMother)+1.e-13)>0.00001 ||
     TMath::Abs(pzMother-sumPzDau)/(TMath::Abs(pzMother)+1.e-13)>0.00001){
    AliDebug(2, "Momentum conservation violated, skipping!!");
    return checkCD;  
  }
  
  checkCD = kTRUE;
  return checkCD;
  
}