PWG4/PartCorr/AliAnalysisTaskGammaConversion.cxx

   1 /**************************************************************************\r
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *\r
   3  *                                                                        *\r
   4  * Author: Ana Marin, Kathrin Koch, Kenneth Aamodt                        *\r
   5  * Version 1.0                                                            *\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 // Class used to do analysis on conversion pairs\r
  19 //---------------------------------------------\r
  20 ////////////////////////////////////////////////\r
  21 \r
  22 // root\r
  23 #include <TChain.h>\r
  24 \r
  25 // analysis\r
  26 #include "AliAnalysisTaskGammaConversion.h"\r
  27 #include "AliStack.h"\r
  28 #include "AliLog.h"\r
  29 #include <vector>\r
  30 \r
  31 class AliKFVertex;\r
  32 class AliAODHandler;\r
  33 class AliAODEvent;\r
  34 class ALiESDEvent;\r
  35 class AliMCEvent;\r
  36 class AliMCEventHandler;\r
  37 class AliESDInputHandler;\r
  38 class AliAnalysisManager;\r
  39 class Riostream;\r
  40 class TFile;\r
  41 class TInterpreter;\r
  42 class TSystem;\r
  43 class TROOT;\r
  44 \r
  45 ClassImp(AliAnalysisTaskGammaConversion)\r
  46 \r
  47 \r
  48 AliAnalysisTaskGammaConversion::AliAnalysisTaskGammaConversion():\r
  49   AliAnalysisTaskSE(),\r
  50   fV0Reader(NULL),\r
  51   fStack(NULL),\r
  52   fOutputContainer(NULL),\r
  53   fHistograms(NULL),\r
  54   fDoMCTruth(kFALSE),\r
  55   fMCAllGammas(),\r
  56   fMCPi0s(),\r
  57   fMCEtas(),\r
  58   fMCGammaChic(),\r
  59   fKFReconstructedGammas(),\r
  60   fElectronMass(-1),\r
  61   fGammaMass(-1),\r
  62   fPi0Mass(-1),\r
  63   fEtaMass(-1),\r
  64   fGammaWidth(-1),\r
  65   fPi0Width(-1),\r
  66   fEtaWidth(-1),\r
  67   fCalculateBackground(kFALSE)\r
  68 {\r
  69   // Default constructor\r
  70   // Common I/O in slot 0\r
  71   DefineInput (0, TChain::Class());\r
  72   DefineOutput(0, TTree::Class());\r
  73 \r
  74   // Your private output\r
  75   DefineOutput(1, TList::Class());\r
  76 }\r
  77 \r
  78 AliAnalysisTaskGammaConversion::AliAnalysisTaskGammaConversion(const char* name):\r
  79   AliAnalysisTaskSE(name),\r
  80   fV0Reader(NULL),\r
  81   fStack(NULL),\r
  82   fOutputContainer(0x0),\r
  83   fHistograms(NULL),\r
  84   fDoMCTruth(kFALSE),\r
  85   fMCAllGammas(),\r
  86   fMCPi0s(),\r
  87   fMCEtas(),\r
  88   fMCGammaChic(),\r
  89   fKFReconstructedGammas(),\r
  90   fElectronMass(-1),\r
  91   fGammaMass(-1),\r
  92   fPi0Mass(-1),\r
  93   fEtaMass(-1),\r
  94   fGammaWidth(-1),\r
  95   fPi0Width(-1),\r
  96   fEtaWidth(-1),\r
  97   fCalculateBackground(kFALSE)\r
  98 {\r
  99   // Common I/O in slot 0\r
 100   DefineInput (0, TChain::Class());\r
 101   DefineOutput(0, TTree::Class());\r
 102   \r
 103   // Your private output\r
 104   DefineOutput(1, TList::Class());\r
 105 }\r
 106 \r
 107 AliAnalysisTaskGammaConversion::~AliAnalysisTaskGammaConversion() \r
 108 {\r
 109   // Remove all pointers\r
 110  \r
 111   if(fOutputContainer){\r
 112     fOutputContainer->Clear() ; \r
 113     delete fOutputContainer ;\r
 114   }\r
 115   if(fHistograms){\r
 116     delete fHistograms;\r
 117   }\r
 118   if(fV0Reader){\r
 119     delete fV0Reader;\r
 120   }\r
 121 }\r
 122 \r
 123 \r
 124 void AliAnalysisTaskGammaConversion::Init()\r
 125 {\r
 126   // Initialization\r
 127 }\r
 128 \r
 129 \r
 130 void AliAnalysisTaskGammaConversion::Exec(Option_t */*option*/)\r
 131 {\r
 132   // Execute analysis for current event\r
 133   \r
 134   ConnectInputData("");\r
 135   \r
 136   //clear vectors\r
 137   fMCAllGammas.clear();\r
 138   fMCPi0s.clear();\r
 139   fMCEtas.clear();\r
 140   fMCGammaChic.clear();\r
 141 \r
 142   fKFReconstructedGammas.clear();\r
 143 \r
 144   //Clear the data in the v0Reader\r
 145   fV0Reader->UpdateEventByEventData();\r
 146 \r
 147   // Process the MC information\r
 148   if(fDoMCTruth){\r
 149     ProcessMCData();\r
 150   }\r
 151 \r
 152   // Process the v0 information\r
 153   ProcessV0s();\r
 154 \r
 155   //calculate background if flag is set\r
 156   if(fCalculateBackground){\r
 157     CalculateBackground();\r
 158   }\r
 159 \r
 160   // Process reconstructed gammas\r
 161   ProcessGammasForNeutralMesonAnalysis();\r
 162 \r
 163   PostData(1, fOutputContainer);\r
 164   \r
 165 }\r
 166 \r
 167 void AliAnalysisTaskGammaConversion::ConnectInputData(Option_t */*option*/){\r
 168   // see header file for documentation\r
 169 \r
 170   if(fV0Reader == NULL){\r
 171     // Write warning here cuts and so on are default if this ever happens\r
 172   }\r
 173   fV0Reader->Initialize();\r
 174 }\r
 175 \r
 176 void AliAnalysisTaskGammaConversion::ProcessMCData(){\r
 177   // see header file for documentation\r
 178   \r
 179   fStack = fV0Reader->GetMCStack();\r
 180 \r
 181   for (Int_t iTracks = 0; iTracks < fStack->GetNtrack(); iTracks++) {\r
 182     TParticle* particle = (TParticle *)fStack->Particle(iTracks);\r
 183 \r
 184     if (!particle) {\r
 185       //print warning here\r
 186       continue;\r
 187     }\r
 188     \r
 189     if(particle->Pt()<fV0Reader->GetPtCut()){\r
 190       continue;\r
 191     }\r
 192     \r
 193     if(TMath::Abs(particle->Eta())> fV0Reader->GetEtaCut()){\r
 194       continue;\r
 195     }\r
 196 \r
 197     if(particle->R()>fV0Reader->GetMaxRCut()){ // cuts on distance from collision point\r
 198       continue;\r
 199     }\r
 200 \r
 201     Double_t tmpPhi=particle->Phi();\r
 202     if(particle->Phi()> TMath::Pi()){\r
 203       tmpPhi = particle->Phi()-(2*TMath::Pi());\r
 204     }\r
 205 \r
 206     \r
 207     //process the gammas\r
 208     if (particle->GetPdgCode()== 22){\r
 209       fMCAllGammas.push_back(particle);\r
 210       if(particle->GetMother(0)>-1){ //Means we have a mother\r
 211         if( fStack->Particle(particle->GetMother(0))->GetPdgCode() != 22 ){//Checks for a non gamma mother.\r
 212           fHistograms->FillHistogram("MC_Gamma_Energy", particle->Energy());\r
 213           fHistograms->FillHistogram("MC_Gamma_Pt", particle->Pt());\r
 214           fHistograms->FillHistogram("MC_Gamma_Eta", particle->Eta());\r
 215           \r
 216           fHistograms->FillHistogram("MC_Gamma_Phi", tmpPhi);\r
 217 \r
 218           //adding the conversion points from all gammas with e+e- daughters\r
 219           if(particle->GetNDaughters() == 2){\r
 220             TParticle* daughter0 = (TParticle*)fStack->Particle(particle->GetFirstDaughter());\r
 221             TParticle* daughter1 = (TParticle*)fStack->Particle(particle->GetLastDaughter());\r
 222             \r
 223             if(daughter0->R()>fV0Reader->GetMaxRCut() || daughter1->R()>fV0Reader->GetMaxRCut()){\r
 224               continue;\r
 225             }\r
 226             \r
 227             if((daughter0->GetPdgCode() == -11 && daughter1->GetPdgCode()) == 11 ||\r
 228                (daughter0->GetPdgCode() == 11 && daughter1->GetPdgCode() == -11)){\r
 229 \r
 230               // begin Mapping \r
 231               Int_t rBin    = fHistograms->GetRBin(daughter0->R());\r
 232               Int_t phiBin  = fHistograms->GetPhiBin(daughter0->Phi());\r
 233               \r
 234               TString nameMCMappingPhiR="";\r
 235               nameMCMappingPhiR.Form("MC_EP_Mapping-Phi%02d-R%02d",phiBin,rBin);\r
 236               fHistograms->FillHistogram(nameMCMappingPhiR, daughter0->Vz(), particle->Eta());\r
 237               \r
 238               TString nameMCMappingPhi="";\r
 239               nameMCMappingPhi.Form("MC_EP_Mapping-Phi%02d",phiBin);\r
 240               fHistograms->FillHistogram(nameMCMappingPhi, particle->Eta());\r
 241               \r
 242               TString nameMCMappingR="";\r
 243               nameMCMappingR.Form("MC_EP_Mapping-R%02d",rBin);\r
 244               fHistograms->FillHistogram(nameMCMappingR, particle->Eta());\r
 245               \r
 246               TString nameMCMappingPhiInR="";\r
 247               nameMCMappingPhiInR.Form("MC_EP_Mapping_Phi_vs_R_R-%02d",rBin);\r
 248               fHistograms->FillHistogram(nameMCMappingPhiInR, daughter0->R(), tmpPhi);\r
 249               //end mapping\r
 250 \r
 251               fHistograms->FillHistogram("MC_EP_R",daughter0->R());\r
 252               fHistograms->FillHistogram("MC_EP_ZR",daughter0->Vz(),daughter0->R());\r
 253               fHistograms->FillHistogram("MC_EP_XY",daughter0->Vx(),daughter0->Vy());\r
 254               fHistograms->FillHistogram("MC_EP_OpeningAngle",GetMCOpeningAngle(daughter0, daughter1));\r
 255             }\r
 256           }\r
 257         }\r
 258         if( fStack->Particle(particle->GetMother(0))->GetPdgCode()==10441 ||//chic0 \r
 259             fStack->Particle(particle->GetMother(0))->GetPdgCode()==20443 ||//psi2S\r
 260             fStack->Particle(particle->GetMother(0))->GetPdgCode()==445  //chic2\r
 261         ){ \r
 262           fMCGammaChic.push_back(particle);\r
 263          }\r
 264       }\r
 265       else{//means we have a primary particle\r
 266         fHistograms->FillHistogram("MC_DirectGamma_Energy",particle->Energy());\r
 267         fHistograms->FillHistogram("MC_DirectGamma_Pt", particle->Pt());\r
 268         fHistograms->FillHistogram("MC_DirectGamma_Eta", particle->Eta());\r
 269         fHistograms->FillHistogram("MCDirectGammaPhi", tmpPhi);\r
 270 \r
 271         //adding the conversion points from all gammas with e+e- daughters\r
 272         if(particle->GetNDaughters() == 2){\r
 273           TParticle* daughter0 = (TParticle*)fStack->Particle(particle->GetFirstDaughter());\r
 274           TParticle* daughter1 = (TParticle*)fStack->Particle(particle->GetLastDaughter());\r
 275           if((daughter0->GetPdgCode() == -11 && daughter1->GetPdgCode() == 11) ||\r
 276              (daughter0->GetPdgCode() == 11 && daughter1->GetPdgCode() == -11)){\r
 277             \r
 278             fHistograms->FillHistogram("MC_EP_R",daughter0->R());\r
 279             fHistograms->FillHistogram("MC_EP_ZR",daughter0->Vz(),daughter0->R());\r
 280             fHistograms->FillHistogram("MC_EP_XY",daughter0->Vx(),daughter0->Vy());\r
 281             fHistograms->FillHistogram("MC_EP_OpeningAngle",GetMCOpeningAngle(daughter0, daughter1));\r
 282 \r
 283           }\r
 284         }\r
 285 \r
 286       }\r
 287     }\r
 288     else if (TMath::Abs(particle->GetPdgCode())== 11){ // Means we have an electron or a positron\r
 289       if(particle->GetMother(0)>-1){ // means we have a mother\r
 290         if( fStack->Particle(particle->GetMother(0))->GetPdgCode()==22 ){ // Means we have a gamma mother\r
 291           if(particle->GetPdgCode() == 11){//electron \r
 292             fHistograms->FillHistogram("MC_E_Energy", particle->Energy());\r
 293             fHistograms->FillHistogram("MC_E_Pt", particle->Pt());\r
 294             fHistograms->FillHistogram("MC_E_Eta", particle->Eta());\r
 295             fHistograms->FillHistogram("MC_E_Phi", tmpPhi);\r
 296           }\r
 297           if(particle->GetPdgCode() == -11){//positron \r
 298             fHistograms->FillHistogram("MC_P_Energy", particle->Energy());\r
 299             fHistograms->FillHistogram("MC_P_Pt", particle->Pt());\r
 300             fHistograms->FillHistogram("MC_P_Eta", particle->Eta());\r
 301             fHistograms->FillHistogram("MC_P_Phi", tmpPhi);\r
 302           }\r
 303         }\r
 304       }\r
 305     }\r
 306     else if(particle->GetNDaughters() == 2){\r
 307 \r
 308       TParticle* daughter0 = (TParticle*)fStack->Particle(particle->GetFirstDaughter());\r
 309       TParticle* daughter1 = (TParticle*)fStack->Particle(particle->GetLastDaughter());\r
 310       if(daughter0->GetPdgCode() == 22 && daughter1->GetPdgCode() == 22){//check for gamma gamma daughters\r
 311         \r
 312         if(particle->GetPdgCode()==111){//Pi0\r
 313           \r
 314           fHistograms->FillHistogram("MC_Pi0_Secondaries_Phi", tmpPhi);\r
 315 \r
 316           if( iTracks >= fStack->GetNprimary()){\r
 317             \r
 318             fHistograms->FillHistogram("MC_Pi0_Secondaries_Eta", particle->Eta());\r
 319 \r
 320             fHistograms->FillHistogram("MC_Pi0_Secondaries_Phi", tmpPhi);\r
 321             fHistograms->FillHistogram("MC_Pi0_Secondaries_Pt", particle->Pt());\r
 322             fHistograms->FillHistogram("MC_Pi0_Secondaries_Energy", particle->Energy());\r
 323             fHistograms->FillHistogram("MC_Pi0_Secondaries_R", particle->R());\r
 324             fHistograms->FillHistogram("MC_Pi0_Secondaries_ZR", particle->Vz(),particle->R());\r
 325             fHistograms->FillHistogram("MC_Pi0_Secondaries_OpeningAngle_Gamma", GetMCOpeningAngle(daughter0,daughter1));\r
 326             fHistograms->FillHistogram("MC_Pi0_Secondaries_XY", particle->Vx(),particle->Vy());//only fill from one daughter to avoid multiple filling\r
 327           }\r
 328           else{\r
 329             fHistograms->FillHistogram("MC_Pi0_Eta", particle->Eta());\r
 330 \r
 331             fHistograms->FillHistogram("MC_Pi0_Phi", tmpPhi);\r
 332             fHistograms->FillHistogram("MC_Pi0_Pt", particle->Pt());\r
 333             fHistograms->FillHistogram("MC_Pi0_Energy", particle->Energy());\r
 334             fHistograms->FillHistogram("MC_Pi0_R", particle->R());\r
 335             fHistograms->FillHistogram("MC_Pi0_ZR", particle->Vz(),particle->R());\r
 336             fHistograms->FillHistogram("MC_Pi0_OpeningAngle_Gamma", GetMCOpeningAngle(daughter0,daughter1));\r
 337             fHistograms->FillHistogram("MC_Pi0_XY", particle->Vx(), particle->Vy());//only fill from one daughter to avoid multiple filling\r
 338           }\r
 339         }\r
 340         else if(particle->GetPdgCode()==221){//Eta\r
 341           fHistograms->FillHistogram("MC_Eta_Eta", particle->Eta());\r
 342 \r
 343           fHistograms->FillHistogram("MC_Eta_Phi",tmpPhi);\r
 344           fHistograms->FillHistogram("MC_Eta_Pt", particle->Pt());\r
 345           fHistograms->FillHistogram("MC_Eta_Energy", particle->Energy());\r
 346           fHistograms->FillHistogram("MC_Eta_R", particle->R());\r
 347           fHistograms->FillHistogram("MC_Eta_ZR", particle->Vz(),particle->R());\r
 348           fHistograms->FillHistogram("MC_Eta_OpeningAngle_Gamma", GetMCOpeningAngle(daughter0,daughter1));\r
 349           fHistograms->FillHistogram("MC_Eta_XY", particle->Vx(), particle->Vy());//only fill from one daughter to avoid multiple filling\r
 350         }\r
 351         \r
 352         //the match data should be filled no matter which mother the gamma-gamma comes from\r
 353         fHistograms->FillHistogram("MC_Match_Gamma_R", particle->R());\r
 354         fHistograms->FillHistogram("MC_Match_Gamma_ZR", particle->Vz(),particle->R());\r
 355         fHistograms->FillHistogram("MC_Match_Gamma_XY", particle->Vx(),particle->Vy());\r
 356         fHistograms->FillHistogram("MC_Match_Gamma_Mass", particle->GetCalcMass());\r
 357         fHistograms->FillHistogram("MC_Match_Gamma_OpeningAngle", GetMCOpeningAngle(daughter0,daughter1));\r
 358         fHistograms->FillHistogram("MC_Match_Gamma_Energy", particle->Energy());\r
 359         fHistograms->FillHistogram("MC_Match_Gamma_Pt", particle->Pt());\r
 360         fHistograms->FillHistogram("MC_Match_Gamma_Eta", particle->Eta());\r
 361         fHistograms->FillHistogram("MC_Match_Gamma_Phi",tmpPhi);\r
 362       }\r
 363     }\r
 364   }\r
 365 }\r
 366 \r
 367 void AliAnalysisTaskGammaConversion::ProcessV0s(){\r
 368   // see header file for documentation\r
 369 \r
 370   Int_t nSurvivingV0s=0;\r
 371   while(fV0Reader->NextV0()){\r
 372     nSurvivingV0s++;\r
 373     //-------------------------- filling v0 information -------------------------------------\r
 374     fHistograms->FillHistogram("ESD_EP_OpeningAngle", fV0Reader->GetOpeningAngle());    \r
 375     fHistograms->FillHistogram("ESD_EP_R", fV0Reader->GetXYRadius());\r
 376     fHistograms->FillHistogram("ESD_EP_ZR", fV0Reader->GetZ(),fV0Reader->GetXYRadius());\r
 377     fHistograms->FillHistogram("ESD_EP_XY", fV0Reader->GetX(),fV0Reader->GetY());\r
 378     \r
 379     \r
 380     fHistograms->FillHistogram("ESD_E_Energy", fV0Reader->GetNegativeTrackEnergy());\r
 381     fHistograms->FillHistogram("ESD_E_Pt", fV0Reader->GetNegativeTrackPt());\r
 382     fHistograms->FillHistogram("ESD_E_Eta", fV0Reader->GetNegativeTrackEta());\r
 383     fHistograms->FillHistogram("ESD_E_Phi", fV0Reader->GetNegativeTrackPhi());\r
 384     \r
 385     fHistograms->FillHistogram("ESD_P_Energy", fV0Reader->GetPositiveTrackEnergy());\r
 386     fHistograms->FillHistogram("ESD_P_Pt", fV0Reader->GetPositiveTrackPt());\r
 387     fHistograms->FillHistogram("ESD_P_Eta", fV0Reader->GetPositiveTrackEta());\r
 388     fHistograms->FillHistogram("ESD_P_Phi", fV0Reader->GetPositiveTrackPhi());\r
 389     \r
 390     fHistograms->FillHistogram("ESD_Gamma_Energy", fV0Reader->GetMotherCandidateEnergy());\r
 391     fHistograms->FillHistogram("ESD_Gamma_Pt", fV0Reader->GetMotherCandidatePt());\r
 392     fHistograms->FillHistogram("ESD_Gamma_Eta", fV0Reader->GetMotherCandidateEta());\r
 393     fHistograms->FillHistogram("ESD_Gamma_Phi", fV0Reader->GetMotherCandidatePhi());\r
 394 \r
 395 \r
 396     // begin mapping\r
 397     Int_t rBin    = fHistograms->GetRBin(fV0Reader->GetXYRadius());\r
 398     Int_t phiBin  = fHistograms->GetPhiBin(fV0Reader->GetNegativeTrackPhi());\r
 399     Double_t motherCandidateEta= fV0Reader->GetMotherCandidateEta();\r
 400     \r
 401     TString nameESDMappingPhiR="";\r
 402     nameESDMappingPhiR.Form("ESD_EP_Mapping-Phi%02d-R%02d",phiBin,rBin);\r
 403     fHistograms->FillHistogram(nameESDMappingPhiR, fV0Reader->GetZ(), motherCandidateEta);\r
 404 \r
 405     TString nameESDMappingPhi="";\r
 406     nameESDMappingPhi.Form("ESD_EP_Mapping-Phi%02d",phiBin);\r
 407     fHistograms->FillHistogram(nameESDMappingPhi, fV0Reader->GetZ(), motherCandidateEta);\r
 408 \r
 409     TString nameESDMappingR="";\r
 410     nameESDMappingR.Form("ESD_EP_Mapping-R%02d",rBin);\r
 411     fHistograms->FillHistogram(nameESDMappingR, fV0Reader->GetZ(), motherCandidateEta);  \r
 412 \r
 413     TString nameESDMappingPhiInR="";\r
 414     nameESDMappingPhiInR.Form("ESD_EP_Mapping_Phi_vs_R_R-%02d",rBin);\r
 415     fHistograms->FillHistogram(nameESDMappingPhiInR, fV0Reader->GetXYRadius(), fV0Reader->GetMotherCandidatePhi());\r
 416     // end mapping\r
 417     \r
 418     fKFReconstructedGammas.push_back(*fV0Reader->GetMotherCandidateKFCombination());\r
 419 \r
 420     //----------------------------------- checking for "real" conversions (MC match) --------------------------------------\r
 421     if(fDoMCTruth){\r
 422       if(fV0Reader->HasSameMCMother() == kFALSE){\r
 423         continue;\r
 424       }\r
 425 \r
 426       TParticle * negativeMC = (TParticle*)fV0Reader->GetNegativeMCParticle();\r
 427       TParticle * positiveMC = (TParticle*)fV0Reader->GetPositiveMCParticle();\r
 428       if(negativeMC->GetPdgCode()!=11 || positiveMC->GetPdgCode()!=-11){\r
 429         continue;\r
 430       }\r
 431 \r
 432       if(fV0Reader->GetMotherMCParticle()->GetPdgCode() == 22){\r
 433         fHistograms->FillHistogram("ESD_Match_Gamma_XY", fV0Reader->GetX(),fV0Reader->GetY());\r
 434         fHistograms->FillHistogram("ESD_Match_Gamma_OpeningAngle", fV0Reader->GetOpeningAngle());\r
 435         fHistograms->FillHistogram("ESD_Match_Gamma_Pt", fV0Reader->GetMotherCandidatePt());\r
 436         fHistograms->FillHistogram("ESD_Match_Gamma_Energy", fV0Reader->GetMotherCandidateEnergy());\r
 437         fHistograms->FillHistogram("ESD_Match_Gamma_Eta", fV0Reader->GetMotherCandidateEta());\r
 438 \r
 439         fHistograms->FillHistogram("ESD_Match_Gamma_Phi", fV0Reader->GetMotherCandidatePhi());\r
 440         fHistograms->FillHistogram("ESD_Match_Gamma_Mass", fV0Reader->GetMotherCandidateMass());\r
 441         fHistograms->FillHistogram("ESD_Match_Gamma_Width", fV0Reader->GetMotherCandidateWidth());\r
 442         fHistograms->FillHistogram("ESD_Match_Gamma_Chi2", fV0Reader->GetMotherCandidateChi2());\r
 443         fHistograms->FillHistogram("ESD_Match_Gamma_NDF", fV0Reader->GetMotherCandidateNDF());\r
 444         fHistograms->FillHistogram("ESD_Match_Gamma_R", fV0Reader->GetXYRadius());\r
 445         fHistograms->FillHistogram("ESD_Match_Gamma_ZR", fV0Reader->GetZ(),fV0Reader->GetXYRadius());\r
 446 \r
 447         //resolution\r
 448         Double_t mcpt   = fV0Reader->GetMotherMCParticle()->Pt();\r
 449         Double_t esdpt  = fV0Reader->GetMotherCandidatePt();\r
 450         Double_t resdPt = 0;\r
 451         if(mcpt != 0){\r
 452           resdPt = ((esdpt - mcpt)/mcpt)*100;\r
 453         }\r
 454 \r
 455         fHistograms->FillHistogram("Resolution_dPt", mcpt, resdPt);\r
 456         fHistograms->FillHistogram("Resolution_MC_Pt", mcpt);\r
 457         fHistograms->FillHistogram("Resolution_ESD_Pt", esdpt);\r
 458         \r
 459         Double_t resdZ = 0;\r
 460         if(fV0Reader->GetNegativeMCParticle()->Vz() != 0){\r
 461           resdZ = ((fV0Reader->GetZ() -fV0Reader->GetNegativeMCParticle()->Vz())/fV0Reader->GetNegativeMCParticle()->Vz())*100;\r
 462         }\r
 463         \r
 464         fHistograms->FillHistogram("Resolution_dZ", fV0Reader->GetNegativeMCParticle()->Vz(), resdZ);\r
 465         fHistograms->FillHistogram("Resolution_MC_Z", fV0Reader->GetNegativeMCParticle()->Vz());\r
 466         fHistograms->FillHistogram("Resolution_ESD_Z", fV0Reader->GetZ());\r
 467         \r
 468         Double_t resdR = 0;\r
 469         if(fV0Reader->GetNegativeMCParticle()->R() != 0){\r
 470           resdR = ((fV0Reader->GetXYRadius() - fV0Reader->GetNegativeMCParticle()->R())/fV0Reader->GetNegativeMCParticle()->R())*100;\r
 471         }\r
 472         fHistograms->FillHistogram("Resolutiond_R", fV0Reader->GetNegativeMCParticle()->R(), resdR);\r
 473         fHistograms->FillHistogram("Resolution_MC_R", fV0Reader->GetNegativeMCParticle()->R());\r
 474         fHistograms->FillHistogram("Resolution_ESD_R", fV0Reader->GetXYRadius());\r
 475         fHistograms->FillHistogram("Resolution_dR_dPt", resdR, resdPt);\r
 476       }\r
 477     }\r
 478   }\r
 479   fHistograms->FillHistogram("NumberOfSurvivingV0s", nSurvivingV0s);\r
 480   fHistograms->FillHistogram("NumberOfV0s", fV0Reader->GetNumberOfV0s());\r
 481 }\r
 482 \r
 483 void AliAnalysisTaskGammaConversion::ProcessGammasForNeutralMesonAnalysis(){\r
 484   // see header file for documentation\r
 485 \r
 486   for(UInt_t firstGammaIndex=0;firstGammaIndex<fKFReconstructedGammas.size();firstGammaIndex++){\r
 487     for(UInt_t secondGammaIndex=firstGammaIndex+1;secondGammaIndex<fKFReconstructedGammas.size();secondGammaIndex++){\r
 488       AliKFParticle * twoGammaDecayCandidateDaughter0 = &fKFReconstructedGammas[firstGammaIndex];\r
 489       AliKFParticle * twoGammaDecayCandidateDaughter1 = &fKFReconstructedGammas[secondGammaIndex];\r
 490 \r
 491       \r
 492       AliKFParticle *twoGammaCandidate = new AliKFParticle(*twoGammaDecayCandidateDaughter0,*twoGammaDecayCandidateDaughter1);\r
 493 \r
 494       Double_t massTwoGammaCandidate =0.;\r
 495       Double_t widthTwoGammaCandidate = 0.;\r
 496       Double_t chi2TwoGammaCandidate =10000.;   \r
 497       twoGammaCandidate->GetMass(massTwoGammaCandidate,widthTwoGammaCandidate);\r
 498       if(twoGammaCandidate->GetNDF()>0){\r
 499         chi2TwoGammaCandidate = twoGammaCandidate->GetChi2()/twoGammaCandidate->GetNDF();\r
 500         //      if(chi2TwoGammaCandidate>0 && chi2TwoGammaCandidate<fChi2Cut){//TODO  find this out\r
 501         if(chi2TwoGammaCandidate>0 && chi2TwoGammaCandidate<10000){//TODO  find this out see line above\r
 502 \r
 503           TVector3 vectorTwoGammaCandidate(twoGammaCandidate->Px(),twoGammaCandidate->Py(),twoGammaCandidate->Pz());\r
 504 \r
 505           Double_t openingAngleTwoGammaCandidate = twoGammaDecayCandidateDaughter0->GetAngle(*twoGammaDecayCandidateDaughter1);\r
 506 \r
 507           //Calculating by hand the radius\r
 508           Double_t tmpX= twoGammaCandidate->GetX();\r
 509           Double_t tmpY= twoGammaCandidate->GetY();\r
 510           \r
 511           Double_t radiusTwoGammaCandidate = TMath::Sqrt(tmpX*tmpX + tmpY*tmpY);\r
 512 \r
 513           fHistograms->FillHistogram("ESD_TwoGammaCombination_OpeningAngleGamma", openingAngleTwoGammaCandidate);\r
 514           fHistograms->FillHistogram("ESD_TwoGammaCombination_Energy", twoGammaCandidate->GetE());\r
 515           fHistograms->FillHistogram("ESD_TwoGammaCombination_Pt", sqrt(twoGammaCandidate->GetPx()*twoGammaCandidate->GetPx()+twoGammaCandidate->GetPy()*twoGammaCandidate->GetPy()));\r
 516           fHistograms->FillHistogram("ESD_TwoGammaCombination_Eta", vectorTwoGammaCandidate.Eta());\r
 517           fHistograms->FillHistogram("ESD_TwoGammaCombination_Phi", vectorTwoGammaCandidate.Phi());\r
 518           fHistograms->FillHistogram("ESD_TwoGammaCombination_Mass", massTwoGammaCandidate);\r
 519           fHistograms->FillHistogram("ESD_TwoGammaCombination_R", radiusTwoGammaCandidate);\r
 520           fHistograms->FillHistogram("ESD_TwoGammaCombination_ZR", tmpY, radiusTwoGammaCandidate);\r
 521           fHistograms->FillHistogram("ESD_TwoGammaCombination_XY", tmpX, tmpY);   \r
 522           fHistograms->FillHistogram("InvMass_vs_Pt__Spectra",massTwoGammaCandidate ,sqrt(twoGammaCandidate->GetPx()*twoGammaCandidate->GetPx()+twoGammaCandidate->GetPy()*twoGammaCandidate->GetPy()));\r
 523         }\r
 524       }\r
 525       delete twoGammaCandidate;\r
 526     }\r
 527   }\r
 528 \r
 529 }\r
 530 \r
 531 void AliAnalysisTaskGammaConversion::CalculateBackground(){\r
 532   // see header file for documentation\r
 533 \r
 534   vector<AliKFParticle> vectorCurrentEventGoodV0s = fV0Reader->GetCurrentEventGoodV0s();\r
 535   vector<AliKFParticle> vectorPreviousEventGoodV0s = fV0Reader->GetPreviousEventGoodV0s();\r
 536   for(UInt_t iCurrent=0;iCurrent<vectorCurrentEventGoodV0s.size();iCurrent++){\r
 537     AliKFParticle * currentEventGoodV0 = &vectorCurrentEventGoodV0s.at(iCurrent);\r
 538     for(UInt_t iPrevious=0;iPrevious<vectorPreviousEventGoodV0s.size();iPrevious++){\r
 539       AliKFParticle * previousGoodV0 = &vectorPreviousEventGoodV0s.at(iPrevious);\r
 540 \r
 541       AliKFParticle *backgroundCandidate = new AliKFParticle(*currentEventGoodV0,*previousGoodV0);\r
 542 \r
 543       Double_t massBG =0.;\r
 544       Double_t widthBG = 0.;\r
 545       Double_t chi2BG =10000.;  \r
 546       backgroundCandidate->GetMass(massBG,widthBG);\r
 547       if(backgroundCandidate->GetNDF()>0){\r
 548         chi2BG = backgroundCandidate->GetChi2()/backgroundCandidate->GetNDF();\r
 549         //      if(chi2Pi0>0 && chi2Pi0<fChi2Cut){//TODO  find this out\r
 550         if(chi2BG>0 && chi2BG<fV0Reader->GetChi2Cut()){//TODO  find this out see line above\r
 551 \r
 552           TVector3 vectorBGCandidate(backgroundCandidate->Px(),backgroundCandidate->Py(),backgroundCandidate->Pz());\r
 553 \r
 554           Double_t openingAngleBG = currentEventGoodV0->GetAngle(*previousGoodV0);\r
 555 \r
 556           //Calculating by hand the radius (find a better way)\r
 557           Double_t tmpX= backgroundCandidate->GetX();\r
 558           Double_t tmpY= backgroundCandidate->GetY();\r
 559           \r
 560           Double_t radiusBG = TMath::Sqrt(tmpX*tmpX + tmpY*tmpY);\r
 561 \r
 562           fHistograms->FillHistogram("ESD_Background_GammaDaughter_OpeningAngle", openingAngleBG);\r
 563           fHistograms->FillHistogram("ESD_Background_Energy", backgroundCandidate->GetE());\r
 564           fHistograms->FillHistogram("ESD_Background_Pt", sqrt(backgroundCandidate->GetPx()*backgroundCandidate->GetPx()+backgroundCandidate->GetPy()*backgroundCandidate->GetPy()));\r
 565           fHistograms->FillHistogram("ESD_Background_Eta", vectorBGCandidate.Eta());\r
 566           fHistograms->FillHistogram("ESD_Background_Phi", vectorBGCandidate.Phi());\r
 567           fHistograms->FillHistogram("ESD_Background_Mass", massBG);\r
 568           fHistograms->FillHistogram("ESD_Background_R", radiusBG);\r
 569           fHistograms->FillHistogram("ESD_Background_ZR", tmpY, radiusBG);\r
 570           fHistograms->FillHistogram("ESD_Background_XY", tmpX, tmpY);\r
 571         }\r
 572       }\r
 573       delete backgroundCandidate;   \r
 574     }\r
 575   }\r
 576 }\r
 577 \r
 578 void AliAnalysisTaskGammaConversion::Terminate(Option_t */*option*/)\r
 579 {\r
 580   // Terminate analysis\r
 581   //\r
 582   AliDebug(1,"Do nothing in Terminate");\r
 583 }\r
 584 \r
 585 void AliAnalysisTaskGammaConversion::UserCreateOutputObjects()\r
 586 {\r
 587   // Create the output container\r
 588   if(fOutputContainer != NULL){\r
 589     delete fOutputContainer;\r
 590     fOutputContainer = NULL;\r
 591   }\r
 592   if(fOutputContainer == NULL){\r
 593     fOutputContainer = new TList();\r
 594   }\r
 595   fHistograms->GetOutputContainer(fOutputContainer);\r
 596   fOutputContainer->SetName(GetName()) ;  \r
 597 }\r
 598 \r
 599 Double_t AliAnalysisTaskGammaConversion::GetMCOpeningAngle(TParticle* daughter0, TParticle* daughter1) const{\r
 600   //helper function\r
 601   TVector3 v3D0(daughter0->Px(),daughter0->Py(),daughter0->Pz());\r
 602   TVector3 v3D1(daughter1->Px(),daughter1->Py(),daughter1->Pz());\r
 603   return v3D0.Angle(v3D1);\r
 604 }\r
 605 \r