class AliAnalysisTaskSECharmFraction: public AliAnalysisTaskSE

Default constructor

 Constructor

 Constructor

 Initialization

 Create histograms
 Called once

 Execute analysis for current event:
 heavy flavor candidates association to MC truth

 creating cuts for D0 -> Kpi

Check wheter the candidate inv. mass is compatible with signal or sideband inv. mass selection

THIS METHOD CHECK THE TYPE OF SIGNAL/BACKGROUND THE CANDIDATE IS.
  IF (!AND ONLY IF) THE TWO DAUGHTERS COME FROM A COMMONE MOTHER A FAKE TRUE SECONDARY VERTEX IS CONSTRUCTED (aodDMC)

 THE FOLLOWING SCHEME IS ADOPTED: signaltype is set to
  1:signal (D0 prompt); 2: signal D0 from Dstar; 3: D0 fromB 4: D0 from Dstar fromB
 then background categories: -1: one or both daughters is a fake track
                             5: both daughters come from a D meson != D0
                             6: both daughters come from a D0->4prongs
                             7: both daughetrs are primaries
                             8: generic background (can include one of the previous if desired)
                             9: daughters out of acceptance
                            10: pathologic cases (not clear)
                            11: end of the method without output
                            12: different result than MatchToMC method

 checking whether the mother of the particles come from a charm or a bottom quark

THIS METHOD CHECK THE TYPE OF SIGNAL/BACKGROUND THE CANDIDATE IS.
  IF (!AND ONLY IF) THE TWO DAUGHTERS COME FROM A COMMONE MOTHER A FAKE TRUE SECONDARY VERTEX IS CONSTRUCTED (aodDMC)

 THE FOLLOWING SCHEME IS ADOPTED: signaltype is set to
  1:signal (D0 prompt); 2: signal D0 from Dstar; 3: D0 fromB 4: D0 from Dstar fromB
 then background categories: -1: one or both daughters is a fake track
                             5: both daughters come from a D meson != D0
                             6: both daughters come from a D0->4prongs
                             7: both daughetrs are primaries
                             8: generic background (can include one of the previous if desired)
                             9: daughters out of acceptance
                            10: pathologic cases (not clear)
                            11: end of the method without output
                            12: different result than MatchToMC method

 CONSTRUCT A FAKE TRUE SECONDARY VERTEX (aodDMC)
NOTE THAT ONLY ONE MOTHER IS CONSIDERED: THE METHOD REQUIRES THE DAUGHTERS COME FROM THE SAME MOTHER 

            HERE LOOK AT global properties of D0 mesons, c quarks and B

SET THE DEFAULT VALUES FOR INVARIANT MASS SELECTION

Calculate the primary vertex w/o the daughter tracks of the candidate

 Method cp paste from AliCFTaskVertexingHF
 ad-hoc weight function from ratio of
 D0 pt spectra in PbPb 2011 0-10% centrality and
 pt spectra from MC production LHC12a17a (PYTHIA Perugia0 with pthard bins)

TERMINATE METHOD: NOTHING TO DO

 ######### THE FOLLOWING IS FOR FURTHER IMPLEMENATION ############
     Int_t GetPtBin(Double_t pt)const;
     void SetD0Cuts(Int_t ptbin,Double_t &*d0cutsLoose,Double_t &*d0cutsTight);

     //  void InvMassSelection();

     void SetCheckMC(Bool_t checkMC){fcheckMC=checkMC;}
     void SetCheckMC_D0(Bool_t check_D0){fcheckMCD0=check_D0;}
     void SetCheckMC_2prongs(Bool_t check2prongs){fcheckMC2prongs=check2prongs;}
     void SetCheckMC_prompt(Bool_t checkprompt){fcheckMCprompt=checkprompt;}
     void SetCheckMC_fromB(Bool_t checkfromB){fcheckMCfromB=checkfromB;}
     void SetCheckMC_fromDstar(Bool_t skipD0star){fSkipD0star=skipD0star;}
     void SetUseCuts(Bool_t usecuts){fD0usecuts=usecuts;}
     void SetSideBands(Double_t sideband){fSideBands=sideband;}
     void SetStudyPureBackground(Bool_t back){fStudyPureBackground=back;}