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