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 */
9 //***********************************************************************
10 // Class AliHFPtSpectrum
11 // Base class for feed-down corrections on heavy-flavour decays
12 // computes the cross-section via one of the three implemented methods:
13 // 0) Consider no feed-down prediction
14 // 1) Subtract the feed-down with the "fc" method
15 // Yield = Reco * fc; where fc = 1 / ( 1 + (eff_b/eff_c)*(N_b/N_c) ) ;
16 // 2) Subtract the feed-down with the "Nb" method
17 // Yield = Reco - Feed-down (exact formula on the function implementation)
19 // (the corrected yields per bin are divided by the bin-width)
21 // Author: Z.Conesa, zconesa@in2p3.fr
22 //***********************************************************************
28 class TGraphAsymmErrors;
32 class AliHFPtSpectrum: public TNamed
38 AliHFPtSpectrum(const char* name="AliHFPtSpectrum", const char* title="HF feed down correction class", Int_t option=1);
40 AliHFPtSpectrum(const AliHFPtSpectrum &rhs);
41 // Assignment operator
42 AliHFPtSpectrum& operator=(const AliHFPtSpectrum &source);
44 virtual ~AliHFPtSpectrum();
49 // Set the theoretical direct & feeddown pt spectrum
50 void SetMCptSpectra(TH1D *hDirect, TH1D *hFeedDown);
51 // Set the theoretical feeddown pt spectrum
52 void SetFeedDownMCptSpectra(TH1D *hFeedDown);
53 // Set the theoretical direct & feeddown pt spectrum upper and lower bounds
54 void SetMCptDistributionsBounds(TH1D *hDirectMax, TH1D *hDirectMin, TH1D *hFeedDownMax, TH1D *hFeedDownMin);
55 // Set the theoretical feeddown pt spectrum upper and lower bounds
56 void SetFeedDownMCptDistributionsBounds(TH1D *hFeedDownMax, TH1D *hFeedDownMin);
57 // Set the acceptance and efficiency corrections for direct
58 void SetDirectAccEffCorrection(TH1D *hDirectEff);
59 // Set the acceptance and efficiency corrections for direct & feeddown
60 void SetAccEffCorrection(TH1D *hDirectEff, TH1D *hFeedDownEff);
61 // Set the reconstructed spectrum
62 void SetReconstructedSpectrum(TH1D *hRec);
63 void SetReconstructedSpectrumSystematics(TGraphAsymmErrors *gRec);
64 // Set the calculation option flag for feed-down correction: 0=none, 1=fc , 2=Nb
65 void SetFeedDownCalculationOption(Int_t option){ fFeedDownOption = option; }
66 // Set if the calculation has to consider asymmetric uncertaInt_ties or not
67 void SetComputeAsymmetricUncertainties(Bool_t flag){ fAsymUncertainties = flag; }
68 // Set the luminosity and its uncertainty
69 void SetLuminosity(Double_t luminosity, Double_t unc){
70 fLuminosity[0]=luminosity; fLuminosity[1]=unc;
72 // Set the trigger efficiency and its uncertainty
73 void SetTriggerEfficiency(Double_t efficiency, Double_t unc){
74 fTrigEfficiency[0]=efficiency; fTrigEfficiency[1]=unc;
76 // Set global acceptance x efficiency correction uncertainty (in percentages)
77 void SetAccEffPercentageUncertainty(Double_t globalEffUnc, Double_t globalBCEffRatioUnc){
78 fGlobalEfficiencyUncertainties[0] = globalEffUnc;
79 fGlobalEfficiencyUncertainties[1] = globalBCEffRatioUnc;
81 // Set the normalization factors
82 void SetNormalization(Double_t normalization){
83 fLuminosity[0]=normalization; fTrigEfficiency[0]=1.0;
85 void SetNormalization(Double_t nevents, Double_t sigma){
86 fLuminosity[0]=nevents/sigma; fTrigEfficiency[0]=1.0;
88 void SetNormalization(Double_t nevents, Double_t sigma, Double_t sigmaunc){
89 fLuminosity[0] = nevents/sigma;
90 fTrigEfficiency[0] = 1.0;
91 fLuminosity[1] = fLuminosity[0] * TMath::Sqrt( (1/nevents) + (sigmaunc/sigma)*(sigmaunc/sigma) );
97 // Return the theoretical predictions used for the calculation (rebinned if needed)
98 TH1D * GetDirectTheoreticalSpectrum() const { return (fhDirectMCpt ? (TH1D*)fhDirectMCpt : NULL); }
99 TH1D * GetDirectTheoreticalUpperLimitSpectrum() const { return (fhDirectMCptMax ? (TH1D*)fhDirectMCptMax : NULL); }
100 TH1D * GetDirectTheoreticalLowerLimitSpectrum() const { return (fhDirectMCptMin ? (TH1D*)fhDirectMCptMin : NULL); }
101 TH1D * GetFeedDownTheoreticalSpectrum() const { return (fhFeedDownMCpt ? (TH1D*)fhFeedDownMCpt : NULL); }
102 TH1D * GetFeedDownTheoreticalUpperLimitSpectrum() const { return (fhFeedDownMCptMax ? (TH1D*)fhFeedDownMCptMax : NULL); }
103 TH1D * GetFeedDownTheoreticalLowerLimitSpectrum() const { return (fhFeedDownMCptMin ? (TH1D*)fhFeedDownMCptMin : NULL); }
104 // Return the acceptance and efficiency corrections (rebinned if needed)
105 TH1D * GetDirectAccEffCorrection() const { return (fhDirectEffpt ? (TH1D*)fhDirectEffpt : NULL); }
106 TH1D * GetFeedDownAccEffCorrection() const { return (fhFeedDownEffpt ? (TH1D*)fhFeedDownEffpt : NULL); }
107 // Return the TGraphAsymmErrors of the feed-down correction (extreme systematics)
108 TGraphAsymmErrors * GetFeedDownCorrectionFcExtreme() const { return (fgFcExtreme ? fgFcExtreme : NULL); }
109 // Return the TGraphAsymmErrors of the feed-down correction (conservative systematics)
110 TGraphAsymmErrors * GetFeedDownCorrectionFcConservative() const { return (fgFcConservative ? fgFcConservative : NULL); }
111 // Return the histogram of the feed-down correction
112 TH1D * GetHistoFeedDownCorrectionFc() const { return (fhFc ? (TH1D*)fhFc : NULL); }
113 // Return the histograms of the feed-down correction bounds
114 TH1D * GetHistoUpperLimitFeedDownCorrectionFc() const { return (fhFcMax ? (TH1D*)fhFcMax : NULL); }
115 TH1D * GetHistoLowerLimitFeedDownCorrectionFc() const { return (fhFcMin ? (TH1D*)fhFcMin : NULL); }
116 // Return the TGraphAsymmErrors of the yield after feed-down correction (systematics but feed-down)
117 TGraphAsymmErrors * GetFeedDownCorrectedSpectrum() const { return (fgYieldCorr ? fgYieldCorr : NULL); }
118 // Return the TGraphAsymmErrors of the yield after feed-down correction (feed-down extreme systematics)
119 TGraphAsymmErrors * GetFeedDownCorrectedSpectrumExtreme() const { return (fgYieldCorrExtreme ? fgYieldCorrExtreme : NULL); }
120 // Return the TGraphAsymmErrors of the yield after feed-down correction (feed-down conservative systematics)
121 TGraphAsymmErrors * GetFeedDownCorrectedSpectrumConservative() const { return (fgYieldCorrConservative ? fgYieldCorrConservative : NULL); }
122 // Return the histogram of the yield after feed-down correction
123 TH1D * GetHistoFeedDownCorrectedSpectrum() const { return (fhYieldCorr ? (TH1D*)fhYieldCorr : NULL); }
124 // Return the histogram of the yield after feed-down correction bounds
125 TH1D * GetHistoUpperLimitFeedDownCorrectedSpectrum() const { return (fhYieldCorrMax ? (TH1D*)fhYieldCorrMax : NULL); }
126 TH1D * GetHistoLowerLimitFeedDownCorrectedSpectrum() const { return (fhYieldCorrMin ? (TH1D*)fhYieldCorrMin : NULL); }
127 // Return the equivalent invariant cross-section TGraphAsymmErrors (systematics but feed-down)
128 TGraphAsymmErrors * GetCrossSectionFromYieldSpectrum() const { return (fgSigmaCorr ? fgSigmaCorr : NULL); }
129 // Return the equivalent invariant cross-section TGraphAsymmErrors (feed-down extreme systematics)
130 TGraphAsymmErrors * GetCrossSectionFromYieldSpectrumExtreme() const { return (fgSigmaCorrExtreme ? fgSigmaCorrExtreme : NULL); }
131 // Return the equivalent invariant cross-section TGraphAsymmErrors (feed-down conservative systematics)
132 TGraphAsymmErrors * GetCrossSectionFromYieldSpectrumConservative() const { return (fgSigmaCorrConservative ? fgSigmaCorrConservative : NULL); }
133 // Return the equivalent invariant cross-section histogram
134 TH1D * GetHistoCrossSectionFromYieldSpectrum() const { return (fhSigmaCorr ? (TH1D*)fhSigmaCorr : NULL); }
135 // Return the equivalent invariant cross-section histogram bounds
136 TH1D * GetHistoUpperLimitCrossSectionFromYieldSpectrum() const { return (fhSigmaCorrMax ? (TH1D*)fhSigmaCorrMax : NULL); }
137 TH1D * GetHistoLowerLimitCrossSectionFromYieldSpectrum() const { return (fhSigmaCorrMin ? (TH1D*)fhSigmaCorrMin : NULL); }
141 // Compute the invariant cross-section from the yield (correct it)
142 // variables : analysed delta_y, BR for the final correction, BR b --> decay (relative to the input theoretical prediction)
143 void ComputeHFPtSpectrum(Double_t deltaY=1.0, Double_t branchingRatioC=1.0, Double_t branchingRatioBintoFinalDecay=1.0);
145 // Compute the systematic uncertainties
146 // taking as input the AliHFSystErr uncertainties
147 void ComputeSystUncertainties(AliHFSystErr *systematics, Bool_t combineFeedDown);
149 // Drawing the corrected spectrum comparing to theoretical prediction
150 void DrawSpectrum(TGraphAsymmErrors *gPrediction);
155 void EstimateAndSetDirectEfficiencyRecoBin(TH1D *hSimu, TH1D *hReco);
156 void EstimateAndSetFeedDownEfficiencyRecoBin(TH1D *hSimu, TH1D *hReco);
159 // Functions to reweight histograms for testing purposes:
160 // to reweight the simulation: hToReweight is reweighted as hReference/hToReweight
161 TH1D * ReweightHisto(TH1D *hToReweight, TH1D *hReference);
162 // to reweight the reco-histos: hRecToReweight is reweighted as hReference/hMCToReweight
163 TH1D * ReweightRecHisto(TH1D *hRecToReweight, TH1D *hMCToReweight, TH1D *hMCReference);
173 // Compute the feed-down correction via fc-method
174 void CalculateFeedDownCorrectionFc();
175 // Correct the yield for feed-down correction via fc-method
176 void CalculateFeedDownCorrectedSpectrumFc();
177 // Correct the yield for feed-down correction via Nb-method
178 void CalculateFeedDownCorrectedSpectrumNb(Double_t deltaY, Double_t branchingRatioBintoFinalDecay);
180 // Check histograms consistency function
181 Bool_t CheckHistosConsistency(TH1D *h1, TH1D *h2);
182 // Function to rebin the theoretical spectra in the data-reconstructed spectra binning
183 TH1D * RebinTheoreticalSpectra(TH1D *hTheory, const char *name);
184 // Function to estimate the efficiency in the data-reconstructed spectra binning
185 TH1D * EstimateEfficiencyRecoBin(TH1D *hSimu, TH1D *hReco, const char *name);
191 TH1D *fhDirectMCpt; // Input MC c-->D spectra
192 TH1D *fhFeedDownMCpt; // Input MC b-->D spectra
193 TH1D *fhDirectMCptMax; // Input MC maximum c-->D spectra
194 TH1D *fhDirectMCptMin; // Input MC minimum c-->D spectra
195 TH1D *fhFeedDownMCptMax; // Input MC maximum b-->D spectra
196 TH1D *fhFeedDownMCptMin; // Input MC minimum b-->D spectra
197 TH1D *fhDirectEffpt; // c-->D Acceptance and efficiency correction
198 TH1D *fhFeedDownEffpt; // b-->D Acceptance and efficiency correction
199 TH1D *fhRECpt; // all reconstructed D
201 TGraphAsymmErrors *fgRECSystematics; // all reconstructed D Systematic uncertainties
203 // Normalization factors
204 Double_t fLuminosity[2]; // analyzed luminosity & uncertainty
205 Double_t fTrigEfficiency[2]; // trigger efficiency & uncertainty
206 Double_t fGlobalEfficiencyUncertainties[2]; // uncertainties on the efficiency [0]=c, b, [1]=b/c
211 TH1D *fhFc; // Correction histo fc = 1 / ( 1 + (eff_b/eff_c)*(N_b/N_c) )
212 TH1D *fhFcMax; // Maximum fc histo
213 TH1D *fhFcMin; // Minimum fc histo
214 TGraphAsymmErrors * fgFcExtreme; // Extreme correction as TGraphAsymmErrors
215 TGraphAsymmErrors * fgFcConservative; // Extreme correction as TGraphAsymmErrors
216 TH1D *fhYieldCorr; // Corrected yield (stat unc. only)
217 TH1D *fhYieldCorrMax; // Maximum corrected yield
218 TH1D *fhYieldCorrMin; // Minimum corrected yield
219 TGraphAsymmErrors * fgYieldCorr; // Corrected yield as TGraphAsymmErrors (syst but feed-down)
220 TGraphAsymmErrors * fgYieldCorrExtreme; // Extreme corrected yield as TGraphAsymmErrors (syst from feed-down)
221 TGraphAsymmErrors * fgYieldCorrConservative; // Conservative corrected yield as TGraphAsymmErrors (syst from feed-down)
222 TH1D *fhSigmaCorr; // Corrected cross-section (stat unc. only)
223 TH1D *fhSigmaCorrMax; // Maximum corrected cross-section
224 TH1D *fhSigmaCorrMin; // Minimum corrected cross-section
225 TGraphAsymmErrors * fgSigmaCorr; // Corrected cross-section as TGraphAsymmErrors (syst but feed-down)
226 TGraphAsymmErrors * fgSigmaCorrExtreme; // Extreme corrected cross-section as TGraphAsymmErrors (syst from feed-down)
227 TGraphAsymmErrors * fgSigmaCorrConservative; // Conservative corrected cross-section as TGraphAsymmErrors (syst from feed-down)
230 Int_t fFeedDownOption; // feed-down correction flag: 0=none, 1=fc, 2=Nb
231 Bool_t fAsymUncertainties; // flag: asymmetric uncertainties are (1) or not (0) considered
234 ClassDef(AliHFPtSpectrum,1) // Class for Heavy Flavor spectra corrections