1 /*************************************************************************
2 * Copyright(c) 1998-2009, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
16 ///////////////////////////////////////////////////////////////////////////
17 // Dielectron SignalBase //
21 Base class for signal extraction from a histogram or an array of histograms
22 The histogram is assumed to be an inv. mass spectrum,
23 the array of histograms is assumed to be an array with inv. mass histograms
24 resulting from single and mixed events, as defined in AliDielectron.cxx
28 ///////////////////////////////////////////////////////////////////////////
32 #include <TPaveText.h>
34 #include "AliDielectronSignalBase.h"
36 ClassImp(AliDielectronSignalBase)
38 AliDielectronSignalBase::AliDielectronSignalBase() :
59 // Default Constructor
63 //______________________________________________
64 AliDielectronSignalBase::AliDielectronSignalBase(const char* name, const char* title) :
89 //______________________________________________
90 AliDielectronSignalBase::~AliDielectronSignalBase()
95 if(fHistSignal) delete fHistSignal;
96 if(fHistBackground) delete fHistBackground;
97 if (fHistDataPP) delete fHistDataPP;
98 if (fHistDataPM) delete fHistDataPM;
99 if (fHistDataMM) delete fHistDataMM;
103 //______________________________________________
104 TPaveText* AliDielectronSignalBase::DrawStats(Double_t x1/*=0.*/, Double_t y1/*=0.*/, Double_t x2/*=0.*/, Double_t y2/*=0.*/)
107 // Draw extracted values in a TPaveText
108 // with the corners x1,y2,x2,y2
110 if (TMath::Abs(x1)<1e-20&&TMath::Abs(x2)<1e-20){
116 TPaveText *t=new TPaveText(x1,y1,x2,y2,"brNDC");
117 t->SetFillColor(kWhite);
120 t->AddText(Form("Range : %.2f - %.2f GeV/c^{2}", fIntMin, fIntMax));
121 t->AddText(Form("Signal : %.1f #pm %.1f", fValues(0), fErrors(0)));
122 t->AddText(Form("Backgnd: %.1f #pm %.1f", fValues(1), fErrors(1)));
123 t->AddText(Form("Signif.: %.2f #pm %.2f", fValues(2), fErrors(2)));
124 t->AddText(Form("S/B : %.2f #pm %.2f", fValues(3), fErrors(3)));
126 t->AddText(Form("Mass: %.2f #pm %.2f GeV/c^{2}", fValues(4), fErrors(4)));
127 t->AddText(Form("Mass res.: %.1f #pm %.1f MeV/c^{2}", 1000*fValues(5), 1000*fErrors(5)));
134 //______________________________________________
135 void AliDielectronSignalBase::Print(Option_t */*option*/) const
138 // Print the statistics
140 printf("Signal : %.5g #pm %.5g\n",fValues(0), fErrors(0));
141 printf("Backgnd: %.5g #pm %.5g\n",fValues(1), fErrors(1));
142 printf("Signif.: %.5g #pm %.5g\n",fValues(2), fErrors(2));
143 printf("SoB : %.5g #pm %.5g\n",fValues(3), fErrors(3));
145 printf("Mass: %.5g #pm %.5g\n", fValues(4), fErrors(4));
146 printf("Mass res.: %.5g #pm %.5g\n", fValues(5), fErrors(5));
150 //______________________________________________
151 Double_t AliDielectronSignalBase::ScaleHistograms(TH1* histRaw, TH1* histBackground, Double_t intMin, Double_t intMax)
154 // scale histBackground to match the integral of histRaw in the interval intMin, intMax
157 //protect using over and underflow bins in normalisation calculation
158 if (intMin<histRaw->GetXaxis()->GetXmin()) intMin=histRaw->GetXaxis()->GetXmin();
159 if (intMin<histBackground->GetXaxis()->GetXmin()) intMin=histBackground->GetXaxis()->GetXmin();
161 if (intMax>histRaw->GetXaxis()->GetXmax())
162 intMax=histRaw->GetXaxis()->GetXmax()-histRaw->GetBinWidth(histRaw->GetNbinsX())/2.;
163 if (intMax>histBackground->GetXaxis()->GetXmax())
164 intMax=histBackground->GetXaxis()->GetXmax()-histBackground->GetBinWidth(histBackground->GetNbinsX())/2.;
166 Double_t intRaw = histRaw->Integral(histRaw->FindBin(intMin),histRaw->FindBin(intMax));
167 Double_t intBack = histBackground->Integral(histBackground->FindBin(intMin),histBackground->FindBin(intMax));
168 Double_t scaleFactor=intBack>0?intRaw/intBack:0.;
170 histBackground->Sumw2();
171 histBackground->Scale(scaleFactor);