1 /*************************************************************************
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2 * Copyright(c) 1998-2009, ALICE Experiment at CERN, All rights reserved. *
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4 * Author: The ALICE Off-line Project. *
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5 * Contributors are mentioned in the code where appropriate. *
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7 * Permission to use, copy, modify and distribute this software and its *
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8 * documentation strictly for non-commercial purposes is hereby granted *
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9 * without fee, provided that the above copyright notice appears in all *
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10 * copies and that both the copyright notice and this permission notice *
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11 * appear in the supporting documentation. The authors make no claims *
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12 * about the suitability of this software for any purpose. It is *
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13 * provided "as is" without express or implied warranty. *
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14 **************************************************************************/
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16 ///////////////////////////////////////////////////////////////////////////
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18 // Basic Analysis Task //
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19 // for PID Analysis //
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21 ///////////////////////////////////////////////////////////////////////////
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27 #include <AliVEvent.h>
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28 #include <AliInputEventHandler.h>
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29 #include <AliAnalysisManager.h>
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33 #include <AliPIDCombined.h>
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34 #include <AliPIDResponse.h>
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36 #include "AliAnalysisTaskPIDCombined.h"
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38 const char *AliAnalysisTaskPIDCombined::fgkBinMomDesc[AliAnalysisTaskPIDCombined::kPtBins] = {
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39 " 0 <= p < 0.5 GeV/c",
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40 " 0.5 <= p < 0.7 GeV/c",
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41 " 0.7 <= p < 1.0 GeV/c",
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42 " 1.0 <= p < 1.5 GeV/c",
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43 " 1.5 <= p < 2.0 GeV/c",
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47 ClassImp(AliAnalysisTaskPIDCombined)
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49 //_________________________________________________________________________________
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50 AliAnalysisTaskPIDCombined::AliAnalysisTaskPIDCombined() :
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51 AliAnalysisTaskSE(),
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55 fProbTPCTOFnSigmaTPC(),
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60 fProbTPCTOFnSigTPCMom(),
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61 fProbTPCnSigTPCMom(),
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62 fProbTOFnSigTOFMom(),
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76 //_________________________________________________________________________________
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77 AliAnalysisTaskPIDCombined::AliAnalysisTaskPIDCombined(const char *name) :
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78 AliAnalysisTaskSE(name),
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82 fProbTPCTOFnSigmaTPC(),
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87 fProbTPCTOFnSigTPCMom(),
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88 fProbTPCnSigTPCMom(),
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89 fProbTOFnSigTOFMom(),
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101 DefineInput(0,TChain::Class());
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102 DefineOutput(1, TList::Class());
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105 //_________________________________________________________________________________
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106 void AliAnalysisTaskPIDCombined::UserCreateOutputObjects()
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109 // Initialise the framework objects
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113 // ------- track cuts
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114 fTrackCuts = new AliESDtrackCuts("fTrackCuts", "Standard");
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115 fTrackCuts->SetAcceptKinkDaughters(kFALSE);
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116 fTrackCuts->SetMinNClustersTPC(80);
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117 fTrackCuts->SetMaxChi2PerClusterTPC(4);
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118 fTrackCuts->SetMaxDCAToVertexXY(3);
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119 fTrackCuts->SetMaxDCAToVertexZ(3);
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120 fTrackCuts->SetRequireTPCRefit(kTRUE);
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121 fTrackCuts->SetRequireITSRefit(kTRUE);
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122 fTrackCuts->SetClusterRequirementITS(AliESDtrackCuts::kSPD,AliESDtrackCuts::kAny);
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123 fTrackFilter = new AliAnalysisFilter("trackFilter");
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124 fTrackFilter->AddCuts(fTrackCuts);
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128 // ------- setup PIDCombined
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129 fPIDCombined=new AliPIDCombined;
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130 fPIDCombined->SetDefaultTPCPriors();
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131 fPIDCombined->SetDetectorMask(AliPIDResponse::kDetTPC+AliPIDResponse::kDetTOF);
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133 // no light nuclei - no need to call it, this is default
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134 // fPIDCombined->SetSelectedSpecies(AliPID::kSPECIES);
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137 fHistList.Add(new TH1D("nEvents","Number of Evnets;Selection",2,0,2));
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139 for (Int_t ispec=0; ispec<5; ++ispec){
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142 fProbTPC[ispec]=new TH2D(Form("prob%s_mom_TPC",AliPID::ParticleName(ispec)),
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143 Form("%s probability vs. momentum;momentum;probability",AliPID::ParticleName(ispec)),
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144 100,0.,20.,50,0.,1.);
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145 fHistList.Add(fProbTPC[ispec]);
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146 fProbTPCnSigma[ispec]=new TH2D(Form("prob%s_nSigma_TPC",AliPID::ParticleName(ispec)),
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147 Form("%s probability vs. n#sigma;n#sigma;probability",AliPID::ParticleName(ispec)),
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148 20,-5.,5.,50,0.,1.);
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149 fHistList.Add(fProbTPCnSigma[ispec]);
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151 for (Int_t ibin=0;ibin<kPtBins;ibin++) {
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152 fProbTPCnSigTPCMom[ibin][ispec]=new TH2D(Form("prob%s_nSigma_TPC (%s)",AliPID::ParticleName(ispec),fgkBinMomDesc[ibin]),
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153 Form("%s probability vs. n#sigma;n#sigma;probability",AliPID::ParticleName(ispec)),
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154 20,-5.,5.,50,0.,1.);
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155 fHistList.Add(fProbTPCnSigTPCMom[ibin][ispec]);
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160 fProbTOF[ispec]=new TH2D(Form("prob%s_mom_TOF",AliPID::ParticleName(ispec)),
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161 Form("%s probability vs. momentum;momentum;probability",AliPID::ParticleName(ispec)),
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162 100,0.,20.,50,0.,1.);
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163 fHistList.Add(fProbTOF[ispec]);
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164 fProbTOFnSigma[ispec]=new TH2D(Form("prob%s_nSigma_TOF",AliPID::ParticleName(ispec)),
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165 Form("%s probability vs. n#sigma;n#sigma;probability",AliPID::ParticleName(ispec)),
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166 20,-5.,5.,50,0.,1.);
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167 fHistList.Add(fProbTOFnSigma[ispec]);
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168 for (Int_t ibin=0;ibin<kPtBins;ibin++) {
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169 fProbTOFnSigTOFMom[ibin][ispec]=new TH2D(Form("prob%s_nSigma_TOF (%s)",AliPID::ParticleName(ispec),fgkBinMomDesc[ibin]),
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170 Form("%s probability vs. n#sigma;n#sigma;probability",AliPID::ParticleName(ispec)),
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171 20,-5.,5.,50,0.,1.);
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172 fHistList.Add(fProbTOFnSigTOFMom[ibin][ispec]);
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177 fProbTPCTOF[ispec]=new TH2D(Form("prob%s_mom_TPCTOF",AliPID::ParticleName(ispec)),
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178 Form("%s probability vs. momentum;momentum;probability",AliPID::ParticleName(ispec)),
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179 100,0.,20.,50,0.,1.);
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180 fHistList.Add(fProbTPCTOF[ispec]);
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181 fProbTPCTOFnSigmaTPC[ispec]=new TH2D(Form("probTPCTOF%s_nSigma_TPC",AliPID::ParticleName(ispec)),
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182 Form("%s TPCTOF probability vs. n#sigmaTPC;n#sigma;probability",AliPID::ParticleName(ispec)),
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183 20,-5.,5.,50,0.,1.);
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184 fHistList.Add(fProbTPCTOFnSigmaTPC[ispec]);
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185 for (Int_t ibin=0;ibin<kPtBins;ibin++) {
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186 fProbTPCTOFnSigTPCMom[ibin][ispec]=new TH2D(Form("probTPCTOF%s_nSigma_TPC (%s)",AliPID::ParticleName(ispec),fgkBinMomDesc[ibin]),
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187 Form("%s probability vs. n#sigma;n#sigma;probability",AliPID::ParticleName(ispec)),
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188 20,-5.,5.,50,0.,1.);
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189 fHistList.Add(fProbTPCTOFnSigTPCMom[ibin][ispec]);
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195 fPriors[ispec]=new TH1F(Form("%s_priors",AliPID::ParticleName(ispec)),
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196 Form("%s priors vs momentum",AliPID::ParticleName(ispec)),
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198 fHistList.Add(fPriors[ispec]);
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200 case AliPID::kElectron:
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201 for (Int_t ich=1;ich<=100;ich++) fPriors[ispec]->SetBinContent(ich,0.02);
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203 case AliPID::kMuon:
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204 for (Int_t ich=1;ich<=100;ich++) fPriors[ispec]->SetBinContent(ich,0.02);
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206 case AliPID::kPion:
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207 for (Int_t ich=1;ich<=100;ich++) fPriors[ispec]->SetBinContent(ich,0.56);
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209 case AliPID::kKaon:
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210 for (Int_t ich=1;ich<=100;ich++) fPriors[ispec]->SetBinContent(ich,0.20);
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212 case AliPID::kProton:
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213 for (Int_t ich=1;ich<=100;ich++) fPriors[ispec]->SetBinContent(ich,0.20);
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218 fPIDCombined->SetPriorDistribution((AliPID::EParticleType)ispec,fPriors[ispec]);
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221 fPriorsUsed[ispec] = new TH2D(Form("%s_priorsUsed",AliPID::ParticleName(ispec)),
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222 Form("%s priors vs transverse momentum;p_{t} (GeV/c);priors",AliPID::ParticleName(ispec)),
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223 100,0.,20.,101,0,1.01);
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224 fHistList.Add(fPriorsUsed[ispec]);
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228 fDeDx = new TH2D("hDeDx",";p_{TPC};dE/dx (a.u.)",500,0,5,500,0,500);
229 fHistList.Add(fDeDx);
230 fDeDxTuned = new TH2D("hDeDxTuned",";p_{TPC};dE/dx (a.u.)",500,0,5,500,0,500);
231 fHistList.Add(fDeDxTuned);
233 fHistList.SetOwner();
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234 PostData(1,&fHistList);
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239 //_________________________________________________________________________________
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240 void AliAnalysisTaskPIDCombined::UserExec(Option_t *)
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243 // Main loop. Called for every event
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245 AliAnalysisManager *man=AliAnalysisManager::GetAnalysisManager();
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246 AliInputEventHandler* inputHandler = (AliInputEventHandler*) (man->GetInputEventHandler());
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247 fPIDResponse=inputHandler->GetPIDResponse();
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248 if (!fPIDResponse) AliFatal("This Task needs the PID response attached to the inputHandler");
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250 // Printf(" ---------------------- UserExec PID task ---------------------");
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252 FillHistogram("nEvents",0.);
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254 AliVEvent *event=InputEvent();
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255 AliVTrack *track=0x0;
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256 Int_t ntracks=event->GetNumberOfTracks();
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258 Double_t probTPC[AliPID::kSPECIES]={0.};
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259 Double_t probTOF[AliPID::kSPECIES]={0.};
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260 Double_t probTPCTOF[AliPID::kSPECIES]={0.};
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262 //loop over all tracks
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263 for (Int_t itrack=0; itrack<ntracks; ++itrack){
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265 track=(AliVTrack*)event->GetTrack(itrack);
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267 if ( fTrackFilter->IsSelected(track) ) {
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269 Double_t mom=track->GetTPCmomentum();
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270 Int_t ibin=GetMomBin(mom);
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272 fPIDCombined->SetDetectorMask(AliPIDResponse::kDetTPC);
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273 UInt_t detUsed = fPIDCombined->ComputeProbabilities(track, fPIDResponse, probTPC);
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275 if (detUsed != 0) { // TPC is available
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276 for (Int_t ispec=0; ispec<AliPID::kSPECIES; ++ispec) {
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277 Double_t nSigmaTPC = fPIDResponse->NumberOfSigmasTPC(track,(AliPID::EParticleType)ispec);
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278 fProbTPC[ispec]->Fill(mom,probTPC[ispec]);
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279 fProbTPCnSigma[ispec]->Fill(nSigmaTPC,probTPC[ispec]);
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280 fProbTPCnSigTPCMom[ibin][ispec]->Fill(nSigmaTPC,probTPC[ispec]);
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283 // compute priors for TPC+TOF, even if we ask just TOF for PID
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284 fPIDCombined->SetDetectorMask(AliPIDResponse::kDetTOF);
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285 detUsed = fPIDCombined->ComputeProbabilities(track, fPIDResponse, probTOF);
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286 Double_t priors[5]; // check priors used for TOF
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287 fPIDCombined->GetPriors(track,priors,fPIDResponse,detUsed);
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288 for(Int_t ispec=0;ispec<5;ispec++) fPriorsUsed[ispec]->Fill(TMath::Abs(track->Pt()),priors[ispec]);
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290 if (detUsed != 0) { // TOF is available
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291 for (Int_t ispec=0; ispec<AliPID::kSPECIES; ++ispec) {
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292 Double_t nSigmaTOF = fPIDResponse->NumberOfSigmasTOF(track,(AliPID::EParticleType)ispec);
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293 fProbTOF[ispec]->Fill(mom,probTOF[ispec]);
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294 fProbTOFnSigma[ispec]->Fill(nSigmaTOF,probTOF[ispec]);
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295 fProbTOFnSigTOFMom[ibin][ispec]->Fill(nSigmaTOF,probTOF[ispec]);
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299 fPIDCombined->SetDetectorMask(AliPIDResponse::kDetTOF|AliPIDResponse::kDetTPC);
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300 detUsed = fPIDCombined->ComputeProbabilities(track, fPIDResponse, probTPCTOF);
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301 if (detUsed == (UInt_t)fPIDCombined->GetDetectorMask() ) {
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302 for (Int_t ispec=0; ispec<AliPID::kSPECIES; ++ispec) {
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303 Double_t nSigmaTPC = fPIDResponse->NumberOfSigmasTPC(track,(AliPID::EParticleType)ispec);
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304 fProbTPCTOF[ispec]->Fill(mom,probTPCTOF[ispec]);
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305 fProbTPCTOFnSigmaTPC[ispec]->Fill(nSigmaTPC,probTPCTOF[ispec]);
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306 fProbTPCTOFnSigTPCMom[ibin][ispec]->Fill(nSigmaTPC,probTPCTOF[ispec]);
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312 fPIDResponse->GetTPCsignalTunedOnData(track);
314 fDeDx->Fill(mom,track->GetTPCsignal());
315 fDeDxTuned->Fill(mom,track->GetTPCsignalTunedOnData());
320 PostData(1, &fHistList);
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323 //_________________________________________________________________________________
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324 void AliAnalysisTaskPIDCombined::FillHistogram(const char* name, Double_t x, Double_t weight)
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327 // Fill 1D histogram by name
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329 ((TH1*)fHistList.FindObject(name))->Fill(x,weight);
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332 //_________________________________________________________________________________
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333 void AliAnalysisTaskPIDCombined::FillHistogram(const char* name, Double_t x, Double_t y, Double_t weight)
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336 // Fill 2D histogram by name
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338 ((TH2*)fHistList.FindObject(name))->Fill(x,y,weight);
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342 //_________________________________________________________________________________
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343 Int_t AliAnalysisTaskPIDCombined::GetMomBin(Float_t mom)
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346 // Given momentum return histogram to be filled
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348 if (mom>0. && mom < 0.5) return 0;
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349 if (mom>=0.5 && mom < 0.7) return 1;
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350 if (mom>=0.7 && mom < 1.0) return 2;
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351 if (mom>=1.0 && mom < 1.5) return 3;
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352 if (mom>=1.5 && mom < 2.0) return 4;
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