ANALYSIS/AliAnalysisTaskPIDCombined.cxx

   1 /*************************************************************************\r
   2 * Copyright(c) 1998-2009, ALICE Experiment at CERN, All rights reserved. *\r
   3 *                                                                        *\r
   4 * Author: The ALICE Off-line Project.                                    *\r
   5 * Contributors are mentioned in the code where appropriate.              *\r
   6 *                                                                        *\r
   7 * Permission to use, copy, modify and distribute this software and its   *\r
   8 * documentation strictly for non-commercial purposes is hereby granted   *\r
   9 * without fee, provided that the above copyright notice appears in all   *\r
  10 * copies and that both the copyright notice and this permission notice   *\r
  11 * appear in the supporting documentation. The authors make no claims     *\r
  12 * about the suitability of this software for any purpose. It is          *\r
  13 * provided "as is" without express or implied warranty.                  *\r
  14 **************************************************************************/\r
  15 \r
  16 ///////////////////////////////////////////////////////////////////////////\r
  17 //                                                                       //\r
  18 //                        Basic Analysis Task                            //\r
  19 //                      for PID        Analysis                          //\r
  20 //                                                                       //\r
  21 ///////////////////////////////////////////////////////////////////////////\r
  22 \r
  23 #include <TChain.h>\r
  24 #include <TH1D.h>\r
  25 #include <TH2D.h>\r
  26 \r
  27 #include <AliVEvent.h>\r
  28 #include <AliInputEventHandler.h>\r
  29 #include <AliAnalysisManager.h>\r
  30 \r
  31 #include <AliLog.h>\r
  32 #include <AliPID.h>\r
  33 #include <AliPIDCombined.h>\r
  34 #include <AliPIDResponse.h>\r
  35 \r
  36 #include "AliAnalysisTaskPIDCombined.h"\r
  37 \r
  38 const char *AliAnalysisTaskPIDCombined::fgkBinMomDesc[AliAnalysisTaskPIDCombined::kPtBins] = {\r
  39   " 0 <= p < 0.5 GeV/c",\r
  40   " 0.5 <= p < 0.7 GeV/c",\r
  41   " 0.7 <= p < 1.0 GeV/c",\r
  42   " 1.0 <= p < 1.5 GeV/c",\r
  43   " 1.5 <= p < 2.0 GeV/c",\r
  44   " p >= 2.0 GeV/c"\r
  45 };\r
  46 \r
  47 ClassImp(AliAnalysisTaskPIDCombined)\r
  48 \r
  49 //_________________________________________________________________________________\r
  50 AliAnalysisTaskPIDCombined::AliAnalysisTaskPIDCombined() :\r
  51   AliAnalysisTaskSE(),\r
  52   fHistList(),\r
  53   fProbTPCnSigma(),\r
  54   fProbTOFnSigma(),\r
  55   fProbTPCTOFnSigmaTPC(),\r
  56   fProbTPC(),\r
  57   fProbTOF(),\r
  58   fProbTPCTOF(),\r
  59   fPriors(),\r
  60   fProbTPCTOFnSigTPCMom(),\r
  61   fProbTPCnSigTPCMom(),\r
  62   fProbTOFnSigTOFMom(),\r
  63   fPriorsUsed(),\r
  64   fPIDResponse(0x0),\r
  65   fPIDCombined(0x0),\r
  66   fTrackCuts(0x0),\r
  67   fTrackFilter(0x0)\r
  68 {\r
  69   //\r
  70   // Constructor\r
  71   //\r
  72 }\r
  73 \r
  74 //_________________________________________________________________________________\r
  75 AliAnalysisTaskPIDCombined::AliAnalysisTaskPIDCombined(const char *name) :\r
  76   AliAnalysisTaskSE(name),\r
  77   fHistList(),\r
  78   fProbTPCnSigma(),\r
  79   fProbTOFnSigma(),\r
  80   fProbTPCTOFnSigmaTPC(),\r
  81   fProbTPC(),\r
  82   fProbTOF(),\r
  83   fProbTPCTOF(),\r
  84   fPriors(),\r
  85   fProbTPCTOFnSigTPCMom(),\r
  86   fProbTPCnSigTPCMom(),\r
  87   fProbTOFnSigTOFMom(),\r
  88   fPriorsUsed(),\r
  89   fPIDResponse(0x0),\r
  90   fPIDCombined(0x0),\r
  91   fTrackCuts(0x0),\r
  92   fTrackFilter(0x0)\r
  93 {\r
  94   //\r
  95   // Constructor\r
  96   //\r
  97   DefineInput(0,TChain::Class());\r
  98   DefineOutput(1, TList::Class());\r
  99 }\r
 100 \r
 101 //_________________________________________________________________________________\r
 102 void AliAnalysisTaskPIDCombined::UserCreateOutputObjects()\r
 103 {\r
 104   //\r
 105   // Initialise the framework objects\r
 106   //\r
 107 \r
 108 \r
 109   // ------- track cuts\r
 110   fTrackCuts = new AliESDtrackCuts("fTrackCuts", "Standard");\r
 111   fTrackCuts->SetAcceptKinkDaughters(kFALSE);\r
 112   fTrackCuts->SetMinNClustersTPC(80);\r
 113   fTrackCuts->SetMaxChi2PerClusterTPC(4);\r
 114   fTrackCuts->SetMaxDCAToVertexXY(3);\r
 115   fTrackCuts->SetMaxDCAToVertexZ(3);\r
 116   fTrackCuts->SetRequireTPCRefit(kTRUE);\r
 117   fTrackCuts->SetRequireITSRefit(kTRUE);\r
 118   fTrackCuts->SetClusterRequirementITS(AliESDtrackCuts::kSPD,AliESDtrackCuts::kAny);\r
 119   fTrackFilter = new AliAnalysisFilter("trackFilter");\r
 120   fTrackFilter->AddCuts(fTrackCuts);\r
 121 \r
 122 \r
 123 \r
 124   // ------- setup PIDCombined\r
 125   fPIDCombined=new AliPIDCombined;\r
 126   fPIDCombined->SetDefaultTPCPriors();\r
 127   fPIDCombined->SetDetectorMask(AliPIDResponse::kDetTPC+AliPIDResponse::kDetTOF);\r
 128 \r
 129   // no light nuclei\r
 130   fPIDCombined->SetSelectedSpecies(AliPID::kSPECIES);\r
 131 \r
 132 \r
 133   fHistList.Add(new TH1D("nEvents","Number of Evnets;Selection",2,0,2));\r
 134   Int_t ispecMax = (Int_t)AliPID::kSPECIES; // coverity fix\r
 135   for (Int_t ispec=0; ispec<ispecMax; ++ispec){\r
 136 \r
 137  \r
 138     fProbTPC[ispec]=new TH2D(Form("prob%s_mom_TPC",AliPID::ParticleName(ispec)),\r
 139                                    Form("%s probability vs. momentum;momentum;probability",AliPID::ParticleName(ispec)),\r
 140                                    100,0.,20.,50,0.,1.);\r
 141     fHistList.Add(fProbTPC[ispec]);\r
 142     fProbTPCnSigma[ispec]=new TH2D(Form("prob%s_nSigma_TPC",AliPID::ParticleName(ispec)),\r
 143                                    Form("%s probability vs. n#sigma;n#sigma;probability",AliPID::ParticleName(ispec)),\r
 144                                    20,-5.,5.,50,0.,1.);\r
 145     fHistList.Add(fProbTPCnSigma[ispec]);\r
 146 \r
 147     for (Int_t ibin=0;ibin<kPtBins;ibin++) {\r
 148       fProbTPCnSigTPCMom[ibin][ispec]=new TH2D(Form("prob%s_nSigma_TPC (%s)",AliPID::ParticleName(ispec),fgkBinMomDesc[ibin]),\r
 149                                                Form("%s probability vs. n#sigma;n#sigma;probability",AliPID::ParticleName(ispec)),\r
 150                                                20,-5.,5.,50,0.,1.);\r
 151       fHistList.Add(fProbTPCnSigTPCMom[ibin][ispec]);\r
 152     }\r
 153 \r
 154 \r
 155 \r
 156     fProbTOF[ispec]=new TH2D(Form("prob%s_mom_TOF",AliPID::ParticleName(ispec)),\r
 157                                    Form("%s probability vs. momentum;momentum;probability",AliPID::ParticleName(ispec)),\r
 158                                    100,0.,20.,50,0.,1.);\r
 159     fHistList.Add(fProbTOF[ispec]);\r
 160     fProbTOFnSigma[ispec]=new TH2D(Form("prob%s_nSigma_TOF",AliPID::ParticleName(ispec)),\r
 161                                    Form("%s probability vs. n#sigma;n#sigma;probability",AliPID::ParticleName(ispec)),\r
 162                                    20,-5.,5.,50,0.,1.);\r
 163     fHistList.Add(fProbTOFnSigma[ispec]);\r
 164     for (Int_t ibin=0;ibin<kPtBins;ibin++) {\r
 165       fProbTOFnSigTOFMom[ibin][ispec]=new TH2D(Form("prob%s_nSigma_TOF (%s)",AliPID::ParticleName(ispec),fgkBinMomDesc[ibin]),\r
 166                                                Form("%s probability vs. n#sigma;n#sigma;probability",AliPID::ParticleName(ispec)),\r
 167                                                20,-5.,5.,50,0.,1.);\r
 168       fHistList.Add(fProbTOFnSigTOFMom[ibin][ispec]);\r
 169     }\r
 170 \r
 171 \r
 172 \r
 173     fProbTPCTOF[ispec]=new TH2D(Form("prob%s_mom_TPCTOF",AliPID::ParticleName(ispec)),\r
 174                                    Form("%s probability vs. momentum;momentum;probability",AliPID::ParticleName(ispec)),\r
 175                                    100,0.,20.,50,0.,1.);\r
 176     fHistList.Add(fProbTPCTOF[ispec]);\r
 177     fProbTPCTOFnSigmaTPC[ispec]=new TH2D(Form("probTPCTOF%s_nSigma_TPC",AliPID::ParticleName(ispec)),\r
 178                                    Form("%s TPCTOF probability vs. n#sigmaTPC;n#sigma;probability",AliPID::ParticleName(ispec)),\r
 179                                    20,-5.,5.,50,0.,1.);\r
 180     fHistList.Add(fProbTPCTOFnSigmaTPC[ispec]);\r
 181     for (Int_t ibin=0;ibin<kPtBins;ibin++) {\r
 182       fProbTPCTOFnSigTPCMom[ibin][ispec]=new TH2D(Form("probTPCTOF%s_nSigma_TPC (%s)",AliPID::ParticleName(ispec),fgkBinMomDesc[ibin]),\r
 183                                                Form("%s probability vs. n#sigma;n#sigma;probability",AliPID::ParticleName(ispec)),\r
 184                                                20,-5.,5.,50,0.,1.);\r
 185       fHistList.Add(fProbTPCTOFnSigTPCMom[ibin][ispec]);\r
 186     }\r
 187 \r
 188 \r
 189 \r
 190     // basic priors\r
 191     fPriors[ispec]=new TH1F(Form("%s_priors",AliPID::ParticleName(ispec)),\r
 192                             Form("%s priors vs momentum",AliPID::ParticleName(ispec)),\r
 193                             100,0.,20.);\r
 194     fHistList.Add(fPriors[ispec]);\r
 195     switch (ispec) {\r
 196     case AliPID::kElectron:\r
 197       for (Int_t ich=1;ich<=100;ich++) fPriors[ispec]->SetBinContent(ich,0.02);\r
 198       break;\r
 199     case AliPID::kMuon:\r
 200       for (Int_t ich=1;ich<=100;ich++) fPriors[ispec]->SetBinContent(ich,0.02);\r
 201       break;\r
 202     case AliPID::kPion:\r
 203       for (Int_t ich=1;ich<=100;ich++) fPriors[ispec]->SetBinContent(ich,0.56);\r
 204       break;\r
 205     case AliPID::kKaon:\r
 206       for (Int_t ich=1;ich<=100;ich++) fPriors[ispec]->SetBinContent(ich,0.20);\r
 207       break;\r
 208     case AliPID::kProton:\r
 209       for (Int_t ich=1;ich<=100;ich++) fPriors[ispec]->SetBinContent(ich,0.20);\r
 210       break;\r
 211     default:\r
 212       break;\r
 213     }\r
 214     fPIDCombined->SetPriorDistribution((AliPID::EParticleType)ispec,fPriors[ispec]);\r
 215 \r
 216     // priors used\r
 217     fPriorsUsed[ispec] = new TH2D(Form("%s_priorsUsed",AliPID::ParticleName(ispec)),\r
 218                             Form("%s priors vs transverse momentum;p_{t} (GeV/c);priors",AliPID::ParticleName(ispec)),\r
 219                                   100,0.,20.,101,0,1.01);      \r
 220     fHistList.Add(fPriorsUsed[ispec]);\r
 221   }\r
 222 \r
 223 \r
 224 \r
 225   fHistList.SetOwner();\r
 226   PostData(1,&fHistList);\r
 227 \r
 228 \r
 229 }\r
 230 \r
 231 //_________________________________________________________________________________\r
 232 void AliAnalysisTaskPIDCombined::UserExec(Option_t *)\r
 233 {\r
 234   //\r
 235   // Main loop. Called for every event\r
 236   //\r
 237   AliAnalysisManager *man=AliAnalysisManager::GetAnalysisManager();\r
 238   AliInputEventHandler* inputHandler = (AliInputEventHandler*) (man->GetInputEventHandler());\r
 239   fPIDResponse=inputHandler->GetPIDResponse();\r
 240   if (!fPIDResponse) AliFatal("This Task needs the PID response attached to the inputHandler");\r
 241 \r
 242   //  Printf(" ---------------------- UserExec PID task ---------------------");\r
 243   \r
 244   FillHistogram("nEvents",0.);\r
 245 \r
 246   AliVEvent *event=InputEvent();\r
 247   AliVTrack *track=0x0;\r
 248   Int_t ntracks=event->GetNumberOfTracks();\r
 249 \r
 250   Double_t probTPC[AliPID::kSPECIES]={0.};\r
 251   Double_t probTOF[AliPID::kSPECIES]={0.};\r
 252   Double_t probTPCTOF[AliPID::kSPECIES]={0.};\r
 253   \r
 254   //loop over all tracks\r
 255   for (Int_t itrack=0; itrack<ntracks; ++itrack){\r
 256 \r
 257     track=(AliVTrack*)event->GetTrack(itrack);\r
 258 \r
 259     if ( fTrackFilter->IsSelected(track) ) {\r
 260 \r
 261       Double_t mom=track->GetTPCmomentum();\r
 262       Int_t ibin=GetMomBin(mom);\r
 263 \r
 264       fPIDCombined->SetDetectorMask(AliPIDResponse::kDetTPC);\r
 265       UInt_t detUsed = fPIDCombined->ComputeProbabilities(track, fPIDResponse, probTPC);\r
 266      \r
 267       if (detUsed != 0) {  // TPC is available\r
 268         for (Int_t ispec=0; ispec<AliPID::kSPECIES; ++ispec) {\r
 269           Double_t nSigmaTPC = fPIDResponse->NumberOfSigmasTPC(track,(AliPID::EParticleType)ispec);\r
 270           fProbTPC[ispec]->Fill(mom,probTPC[ispec]);\r
 271           fProbTPCnSigma[ispec]->Fill(nSigmaTPC,probTPC[ispec]);\r
 272           fProbTPCnSigTPCMom[ibin][ispec]->Fill(nSigmaTPC,probTPC[ispec]);\r
 273         }\r
 274 \r
 275         // compute priors for TPC+TOF, even if we ask just TOF for PID\r
 276         fPIDCombined->SetDetectorMask(AliPIDResponse::kDetTOF);\r
 277         detUsed = fPIDCombined->ComputeProbabilities(track, fPIDResponse, probTOF);\r
 278         Double_t priors[5];     // check priors used for TOF\r
 279         fPIDCombined->GetPriors(track,priors,fPIDResponse,detUsed);\r
 280         for(Int_t ispec=0;ispec<5;ispec++) fPriorsUsed[ispec]->Fill(TMath::Abs(track->Pt()),priors[ispec]);\r
 281 \r
 282         if (detUsed != 0) {  // TOF is available\r
 283           for (Int_t ispec=0; ispec<AliPID::kSPECIES; ++ispec) {\r
 284             Double_t nSigmaTOF = fPIDResponse->NumberOfSigmasTOF(track,(AliPID::EParticleType)ispec);\r
 285             fProbTOF[ispec]->Fill(mom,probTOF[ispec]);\r
 286             fProbTOFnSigma[ispec]->Fill(nSigmaTOF,probTOF[ispec]);\r
 287             fProbTOFnSigTOFMom[ibin][ispec]->Fill(nSigmaTOF,probTOF[ispec]);\r
 288           }\r
 289         }\r
 290 \r
 291         fPIDCombined->SetDetectorMask(AliPIDResponse::kDetTOF|AliPIDResponse::kDetTPC);\r
 292         detUsed = fPIDCombined->ComputeProbabilities(track, fPIDResponse, probTPCTOF);\r
 293         if (detUsed == (UInt_t)fPIDCombined->GetDetectorMask() ) {\r
 294           for (Int_t ispec=0; ispec<AliPID::kSPECIES; ++ispec) {\r
 295             Double_t nSigmaTPC = fPIDResponse->NumberOfSigmasTPC(track,(AliPID::EParticleType)ispec);\r
 296             fProbTPCTOF[ispec]->Fill(mom,probTPCTOF[ispec]);\r
 297             fProbTPCTOFnSigmaTPC[ispec]->Fill(nSigmaTPC,probTPCTOF[ispec]);\r
 298             fProbTPCTOFnSigTPCMom[ibin][ispec]->Fill(nSigmaTPC,probTPCTOF[ispec]);\r
 299           }\r
 300         }\r
 301 \r
 302       }\r
 303 \r
 304 \r
 305     }\r
 306   }\r
 307 \r
 308   PostData(1, &fHistList);\r
 309 }\r
 310 \r
 311 //_________________________________________________________________________________\r
 312 void AliAnalysisTaskPIDCombined::FillHistogram(const char* name, Double_t x, Double_t weight)\r
 313 {\r
 314   //\r
 315   // Fill 1D histogram by name\r
 316   //\r
 317   ((TH1*)fHistList.FindObject(name))->Fill(x,weight);\r
 318 }\r
 319 \r
 320 //_________________________________________________________________________________\r
 321 void AliAnalysisTaskPIDCombined::FillHistogram(const char* name, Double_t x, Double_t y, Double_t weight)\r
 322 {\r
 323   //\r
 324   // Fill 2D histogram by name\r
 325   //\r
 326   ((TH2*)fHistList.FindObject(name))->Fill(x,y,weight);\r
 327 }\r
 328 \r
 329 \r
 330 //_________________________________________________________________________________\r
 331 Int_t AliAnalysisTaskPIDCombined::GetMomBin(Float_t mom)\r
 332 {\r
 333   //\r
 334   // Given momentum return histogram to be filled\r
 335   //\r
 336   if (mom>0. && mom < 0.5) return 0;\r
 337   if (mom>=0.5 && mom < 0.7) return 1;\r
 338   if (mom>=0.7 && mom < 1.0) return 2;\r
 339   if (mom>=1.0 && mom < 1.5) return 3;\r
 340   if (mom>=1.5 && mom < 2.0) return 4;\r
 341   return kPtBins-1;\r
 342 }\r
 343 \r