PWG3/vertexingHF/AliAnalysisBtoJPSItoEle.cxx

   1 /* Copyright(c) 1998-2009, ALICE Experiment at CERN, All rights reserved. *
   2  * See cxx source for full Copyright notice                               */
   3
   4 //-------------------------------------------------------------------------
   5 //                      Class AliAnalysisBtoJPSItoEle
   6 //                  Unbinned log-likelihood fit analysis class
   7 //
   8 //                             Origin: C.Di Giglio
   9 //        Contact: Carmelo.Digiglio@ba.infn.it , giuseppe.bruno@ba.infn.it
  10 //-------------------------------------------------------------------------
  11 class TH1F ;
  12 #include "TNtuple.h"
  13 #include "TMath.h"
  14
  15 #include "AliBtoJPSItoEleCDFfitFCN.h"
  16 #include "AliBtoJPSItoEleCDFfitHandler.h"
  17 #include "AliAnalysisBtoJPSItoEle.h"
  18 #include "AliLog.h"
  19
  20 ClassImp(AliAnalysisBtoJPSItoEle)
  21
  22 //_______________________________________________________________________________
  23 AliAnalysisBtoJPSItoEle::AliAnalysisBtoJPSItoEle() :
  24 fFCNfunction(0),
  25 fPtBin(0),
  26 fMCtemplate(0)
  27 {
  28   //
  29   // default constructor
  30   //
  31 }
  32 //___________________________________________________________________________________
  33 AliAnalysisBtoJPSItoEle::AliAnalysisBtoJPSItoEle(const AliAnalysisBtoJPSItoEle& source) :
  34 TNamed(source),
  35 fFCNfunction(source.fFCNfunction),
  36 fPtBin(source.fPtBin),
  37 fMCtemplate(source.fMCtemplate)
  38 {
  39   //
  40   // copy constructor
  41   //
  42 }
  43 //_________________________________________________________________________________________________
  44
  45 AliAnalysisBtoJPSItoEle &AliAnalysisBtoJPSItoEle::operator=(const AliAnalysisBtoJPSItoEle& source)
  46 {
  47   //
  48   // assignment operator
  49   //
  50   if(&source == this) return *this;
  51   fFCNfunction = source.fFCNfunction;
  52   fPtBin = source.fPtBin;
  53   fMCtemplate = source.fMCtemplate;
  54
  55   return *this;
  56 }
  57 //_________________________________________________________________________________________________
  58 AliAnalysisBtoJPSItoEle::~AliAnalysisBtoJPSItoEle()
  59 {
  60   //
  61   // destructor
  62   //
  63   delete fFCNfunction;
  64   delete fMCtemplate;
  65 }
  66 //_________________________________________________________________________________________________
  67 Int_t AliAnalysisBtoJPSItoEle::DoMinimization()
  68 {
  69   //
  70   // performs the minimization
  71   //
  72   Int_t iret=fFCNfunction->DoMinimization();
  73
  74   return iret;
  75 }
  76 //_________________________________________________________________________________________________
  77 void AliAnalysisBtoJPSItoEle::ReadCandidates(TNtuple* nt, Double_t* &pseudoproper,Double_t* &invmass, Int_t& ncand)
  78 {
  79   //
  80   // Read N-tuple with X and M values
  81   //
  82   Float_t mJPSI = 0; Float_t x = 0;
  83   Int_t nentries = 0;
  84   ncand=0;
  85   nt->SetBranchAddress("Mass",&mJPSI);
  86   nt->SetBranchAddress("Xdecaytime",&x);
  87   nentries = (Int_t)nt->GetEntries();
  88   pseudoproper = new Double_t[nentries];
  89   invmass      = new Double_t[nentries];
  90   for(Int_t i = 0; i < nentries; i++) {
  91       nt->GetEntry(i);
  92       ncand++;
  93       pseudoproper[i]=(Double_t)(10000*x);
  94       invmass[i]=(Double_t)mJPSI;
  95     }
  96
  97  return;
  98 }
  99 //_________________________________________________________________________________________________
 100 void AliAnalysisBtoJPSItoEle::SetCsiMC()
 101 {
 102   //
 103   // Sets X distribution used as MC template for JPSI from B
 104   //
 105   fFCNfunction->LikelihoodPointer()->SetCsiMC(fMCtemplate);
 106
 107   return;
 108 }
 109 //_________________________________________________________________________________________________
 110 void AliAnalysisBtoJPSItoEle::SetFitHandler(Double_t* x /*pseudoproper*/, Double_t* m /*inv mass*/, Int_t ncand /*candidates*/)
 111 {
 112   //
 113   // Create the fit handler object to play with different params of the fitting function
 114   //
 115
 116   fFCNfunction = new AliBtoJPSItoEleCDFfitHandler(x,m,ncand);
 117   if(!fFCNfunction) {
 118
 119      AliInfo("fFCNfunction not istanziated  ---> nothing done");
 120      return;
 121
 122      }
 123 }