1 #ifndef ALIHFPTSPECTRUM_H
2 #define ALIHFPTSPECTRUM_H
4 /* Copyright(c) 1998-2010, ALICE Experiment at CERN, All rights reserved. *
5 * See cxx source for full Copyright notice */
7 //***********************************************************************
8 // Class AliHFPtSpectrum
9 // Base class for feed-down corrections on heavy-flavour decays
10 // computes the cross-section via one of the three implemented methods:
11 // 0) Consider no feed-down prediction
12 // 1) Subtract the feed-down with the "fc" method
13 // Yield = Reco * fc; where fc = 1 / ( 1 + (eff_b/eff_c)*(N_b/N_c) ) ;
14 // 2) Subtract the feed-down with the "Nb" method
15 // Yield = Reco - Feed-down (exact formula on the function implementation)
17 // Author: Z.Conesa, zconesa@in2p3.fr
18 //***********************************************************************
22 #include "TGraphAsymmErrors.h"
24 class AliHFPtSpectrum: public TNamed
30 AliHFPtSpectrum(const char* name="AliHFPtSpectrum", const char* title="HF feed down correction class", Int_t option=1);
32 AliHFPtSpectrum(const AliHFPtSpectrum &rhs);
33 // Assignment operator
34 AliHFPtSpectrum& operator=(const AliHFPtSpectrum &source);
36 virtual ~AliHFPtSpectrum();
41 // Set the theoretical direct & feeddown pt spectrum
42 void SetMCptSpectra(TH1 *hDirect, TH1 *hFeedDown);
43 // Set the theoretical feeddown pt spectrum
44 void SetFeedDownMCptSpectra(TH1 *hFeedDown);
45 // Set the theoretical direct & feeddown pt spectrum upper and lower bounds
46 void SetMCptDistributionsBounds(TH1 *hDirectMax, TH1 *hDirectMin, TH1 *hFeedDownMax, TH1 *hFeedDownMin);
47 // Set the theoretical feeddown pt spectrum upper and lower bounds
48 void SetFeedDownMCptDistributionsBounds(TH1 *hFeedDownMax, TH1 *hFeedDownMin);
49 // Set the acceptance and efficiency corrections for direct
50 void SetDirectAccEffCorrection(TH1 *hDirectEff);
51 // Set the acceptance and efficiency corrections for direct & feeddown
52 void SetAccEffCorrection(TH1 *hDirectEff, TH1 *hFeedDownEff);
53 // Set the reconstructed spectrum
54 void SetReconstructedSpectrum(TH1 *hRec);
55 // Set the calculation option flag for feed-down correction: 0=none, 1=fc , 2=Nb
56 void SetFeedDownCalculationOption(Int_t option){ fFeedDownOption = option; }
57 // Set if the calculation has to consider asymmetric uncertaInt_ties or not
58 void SetComputeAsymmetricUncertainties(Bool_t flag){ fAsymUncertainties = flag; }
59 // Set the luminosity and its uncertainty
60 void SetLuminosity(Double_t luminosity, Double_t unc){
61 fLuminosity[0]=luminosity; fLuminosity[1]=unc;
63 // Set the trigger efficiency and its uncertainty
64 void SetTriggerEfficiency(Double_t efficiency, Double_t unc){
65 fTrigEfficiency[0]=efficiency; fTrigEfficiency[1]=unc;
71 // Return the TGraphAsymmErrors of the feed-down correction
72 TGraphAsymmErrors * GetFeedDownCorrectionFc() { return (fgFc ? fgFc : NULL); }
73 // Return the histogram of the feed-down correction
74 TH1 * GetHistoFeedDownCorrectionFc() { return (fhFc ? fhFc : NULL); }
75 // Return the histograms of the feed-down correction bounds
76 TH1 * GetHistoUpperLimitFeedDownCorrectionFc() { return (fhFcMax ? fhFcMax : NULL); }
77 TH1 * GetHistoLowerLimitFeedDownCorrectionFc() { return (fhFcMin ? fhFcMin : NULL); }
78 // Return the TGraphAsymmErrors of the yield after feed-down correction
79 TGraphAsymmErrors * GetFeedDownCorrectedSpectrum() { return (fgYieldCorr ? fgYieldCorr : NULL); }
80 // Return the histogram of the yield after feed-down correction
81 TH1 * GetHistoFeedDownCorrectedSpectrum() { return (fhYieldCorr ? fhYieldCorr : NULL); }
82 // Return the histogram of the yield after feed-down correction bounds
83 TH1 * GetHistoUpperLimitFeedDownCorrectedSpectrum() { return (fhYieldCorrMax ? fhYieldCorrMax : NULL); }
84 TH1 * GetHistoLowerLimitFeedDownCorrectedSpectrum() { return (fhYieldCorrMin ? fhYieldCorrMin : NULL); }
85 // Return the equivalent invariant cross-section TGraphAsymmErrors
86 TGraphAsymmErrors * GetCrossSectionFromYieldSpectrum() { return (fgSigmaCorr ? fgSigmaCorr : NULL); }
87 // Return the equivalent invariant cross-section histogram
88 TH1 * GetHistoCrossSectionFromYieldSpectrum() { return (fhSigmaCorr ? fhSigmaCorr : NULL); }
89 // Return the equivalent invariant cross-section histogram bounds
90 TH1 * GetHistoUpperLimitCrossSectionFromYieldSpectrum() { return (fhSigmaCorrMax ? fhSigmaCorrMax : NULL); }
91 TH1 * GetHistoLowerLimitCrossSectionFromYieldSpectrum() { return (fhSigmaCorrMin ? fhSigmaCorrMin : NULL); }
95 // Compute the invariant cross-section from the yield (correct it)
96 // variables : analysed delta_y, BR for the final correction, BR b --> decay (relative to the input theoretical prediction)
97 void ComputeHFPtSpectrum(Double_t deltaY=1.0, Double_t branchingRatioC=1.0, Double_t branchingRatioBintoFinalDecay=1.0);
100 // Functions to reweight histograms for testing purposes:
101 // to reweight the simulation: hToReweight is reweighted as hReference/hToReweight
102 TH1 * ReweightHisto(TH1 *hToReweight, TH1 *hReference);
103 // to reweight the reco-histos: hRecToReweight is reweighted as hReference/hMCToReweight
104 TH1 * ReweightRecHisto(TH1 *hRecToReweight, TH1 *hMCToReweight, TH1 *hMCReference);
114 // Compute the feed-down correction via fc-method
115 void CalculateFeedDownCorrectionFc();
116 // Correct the yield for feed-down correction via fc-method
117 void CalculateFeedDownCorrectedSpectrumFc();
118 // Correct the yield for feed-down correction via Nb-method
119 void CalculateFeedDownCorrectedSpectrumNb(Double_t deltaY, Double_t branchingRatioBintoFinalDecay);
121 // Check histograms consistency function
122 Bool_t CheckHistosConsistency(TH1 *h1, TH1 *h2);
127 TH1 *fhDirectMCpt; // Input MC c-->D spectra
128 TH1 *fhFeedDownMCpt; // Input MC b-->D spectra
129 TH1 *fhDirectMCptMax; // Input MC maximum c-->D spectra
130 TH1 *fhDirectMCptMin; // Input MC minimum c-->D spectra
131 TH1 *fhFeedDownMCptMax; // Input MC maximum b-->D spectra
132 TH1 *fhFeedDownMCptMin; // Input MC minimum b-->D spectra
133 TH1 *fhDirectEffpt; // c-->D Acceptance and efficiency correction
134 TH1 *fhFeedDownEffpt; // b-->D Acceptance and efficiency correction
135 TH1 *fhRECpt; // all reconstructed D
137 // Normalization factors
138 Double_t fLuminosity[2]; // analyzed luminosity & uncertainty
139 Double_t fTrigEfficiency[2]; // trigger efficiency & uncertainty
144 TH1 *fhFc; // Correction histo fc = 1 / ( 1 + (eff_b/eff_c)*(N_b/N_c) )
145 TH1 *fhFcMax; // Maximum fc histo
146 TH1 *fhFcMin; // Minimum fc histo
147 TGraphAsymmErrors * fgFc; // Correction as TGraphAsymmErrors
148 TH1 *fhYieldCorr; // Corrected yield
149 TH1 *fhYieldCorrMax; // Maximum corrected yield
150 TH1 *fhYieldCorrMin; // Minimum corrected yield
151 TGraphAsymmErrors * fgYieldCorr; // Corrected yield as TGraphAsymmErrors
152 TH1 *fhSigmaCorr; // Corrected cross-section
153 TH1 *fhSigmaCorrMax; // Maximum corrected cross-section
154 TH1 *fhSigmaCorrMin; // Minimum corrected cross-section
155 TGraphAsymmErrors * fgSigmaCorr; // Corrected cross-section as TGraphAsymmErrors
158 Int_t fFeedDownOption; // feed-down correction flag: 0=none, 1=fc, 2=Nb
159 Bool_t fAsymUncertainties; // flag: asymmetric uncertainties are (1) or not (0) considered
162 ClassDef(AliHFPtSpectrum,1) // Class for Heavy Flavor spectra corrections