PWG4/PartCorrDep/AliAnaOmegaToPi0Gamma.cxx

   1 /**************************************************************************
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   3  *                                                                        *
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  15 /* $Id: $ */
  16 //_________________________________________________________________________
  17 // class to extract omega(782)->pi0+gamma->3gamma
  18 //  Mar. 22, 2011: Additional method, espeically for EMCAL. A high E cluster is assumpted as pi0 (two photons are overlapped) without unfolding
  19 //
  20 //-- Author: Renzhuo Wan (IOPP-Wuhan, China)
  21 //_________________________________________________________________________
  22
  23 // --- ROOT system
  24 class TROOT;
  25
  26 // --- AliRoot system
  27 //class AliVEvent;
  28 // --- ROOT system ---
  29 #include "TH2F.h"
  30 #include "TLorentzVector.h"
  31 #include "TParticle.h"
  32 #include "TCanvas.h"
  33 #include "TFile.h"
  34 //---- AliRoot system ----
  35 #include "AliAnaOmegaToPi0Gamma.h"
  36 #include "AliCaloTrackReader.h"
  37 #include "AliCaloPID.h"
  38 #include "AliStack.h"
  39 #include "AliVEvent.h"
  40 #include "AliAODEvent.h"
  41 #include "AliAODMCParticle.h"
  42 ClassImp(AliAnaOmegaToPi0Gamma)
  43
  44 //______________________________________________________________________________
  45 AliAnaOmegaToPi0Gamma::AliAnaOmegaToPi0Gamma() : AliAnaPartCorrBaseClass(),
  46 fInputAODPi0(0), fInputAODGammaName(""),
  47 fEventsList(0x0),fNVtxZBin(0), fNCentBin(0), fNRpBin(0), fNBadChDistBin(0), fNpid(0),
  48 fVtxZCut(0), fCent(0), fRp(0),
  49 fPi0Mass(0),fPi0MassWindow(0),fPi0OverOmegaPtCut(0),
  50 fGammaOverOmegaPtCut(0), fEOverlapCluster(0),
  51 fhEtalon(0),
  52 fRealOmega0(0), fMixAOmega0(0),
  53 fMixBOmega0(0), fMixCOmega0(0),
  54 fRealOmega1(0), fMixAOmega1(0),
  55 fMixBOmega1(0), fMixCOmega1(0),
  56 fRealOmega2(0), fMixAOmega2(0),
  57 fMixBOmega2(0), fMixCOmega2(0),
  58 fhFakeOmega(0),
  59 fhOmegaPriPt(0)
  60 {
  61  //Default Ctor
  62  InitParameters();
  63 }
  64
  65 //______________________________________________________________________________
  66 AliAnaOmegaToPi0Gamma::~AliAnaOmegaToPi0Gamma() {
  67
  68   //dtor
  69 //  Done by the maker
  70 //  if(fInputAODPi0){
  71 //    fInputAODPi0->Clear();
  72 //    delete fInputAODPi0;
  73 //  }
  74
  75   if(fEventsList){
  76      for(Int_t i=0;i<fNVtxZBin;i++){
  77         for(Int_t j=0;j<fNCentBin;j++){
  78            for(Int_t k=0;k<fNRpBin;k++){
  79                fEventsList[i*fNCentBin*fNRpBin+j*fNRpBin+k]->Clear();
  80                delete fEventsList[i*fNCentBin*fNRpBin+j*fNRpBin+k];
  81            }
  82         }
  83      }
  84   }
  85   delete [] fEventsList;
  86   fEventsList=0;
  87
  88  delete [] fVtxZCut;
  89  delete [] fCent;
  90  delete [] fRp;
  91
  92 }
  93
  94 //______________________________________________________________________________
  95 void AliAnaOmegaToPi0Gamma::InitParameters()
  96 {
  97 //Init parameters when first called the analysis
  98 //Set default parameters
  99  fInputAODGammaName="PhotonsDetector";
 100  fNVtxZBin=1;
 101  fNCentBin=1;
 102  fNRpBin=1;
 103  fNBadChDistBin=3;
 104  fNpid=1;
 105
 106  fPi0Mass=0.1348;
 107  fPi0MassWindow=0.015;
 108  fPi0OverOmegaPtCut=0.8;
 109  fGammaOverOmegaPtCut=0.2;
 110
 111  fEOverlapCluster=6;
 112 }
 113
 114
 115 //______________________________________________________________________________
 116 TList * AliAnaOmegaToPi0Gamma::GetCreateOutputObjects()
 117 {
 118   //
 119   fVtxZCut = new Double_t [fNVtxZBin];
 120   for(Int_t i=0;i<fNVtxZBin;i++) fVtxZCut[i]=10*(i+1);
 121
 122   fCent=new Double_t[fNCentBin];
 123   for(int i = 0;i<fNCentBin;i++)fCent[i]=0;
 124
 125   fRp=new Double_t[fNRpBin];
 126   for(int i = 0;i<fNRpBin;i++)fRp[i]=0;
 127   //
 128   Int_t nptbins   = GetHistoPtBins();
 129   Float_t ptmax   = GetHistoPtMax();
 130   Float_t ptmin   = GetHistoPtMin();
 131
 132   Int_t nmassbins = GetHistoMassBins();
 133   Float_t massmin = GetHistoMassMin();
 134   Float_t massmax = GetHistoMassMax();
 135
 136   fhEtalon = new TH2F("hEtalon","Histo with binning parameters", nptbins,ptmin,ptmax,nmassbins,massmin,massmax) ;
 137   fhEtalon->SetXTitle("P_{T} (GeV)") ;
 138   fhEtalon->SetYTitle("m_{inv} (GeV)") ;
 139
 140   // store them in fOutputContainer
 141   fEventsList = new TList*[fNVtxZBin*fNCentBin*fNRpBin];
 142   for(Int_t i=0;i<fNVtxZBin;i++){
 143     for(Int_t j=0;j<fNCentBin;j++){
 144       for(Int_t k=0;k<fNRpBin;k++){
 145         fEventsList[i*fNCentBin*fNRpBin+j*fNRpBin+k] = new TList();
 146         fEventsList[i*fNCentBin*fNRpBin+j*fNRpBin+k]->SetOwner(kFALSE);
 147       }
 148     }
 149   }
 150
 151   TList * outputContainer = new TList() ;
 152   outputContainer->SetName(GetName());
 153   const Int_t buffersize = 255;
 154   char key[buffersize] ;
 155   char title[buffersize] ;
 156   const char * detector= fInputAODGammaName.Data();
 157   Int_t ndim=fNVtxZBin*fNCentBin*fNRpBin*fNBadChDistBin*fNpid;
 158
 159   fRealOmega0 =new TH2F*[ndim];
 160   fMixAOmega0 =new TH2F*[ndim];
 161   fMixBOmega0 =new TH2F*[ndim];
 162   fMixCOmega0 =new TH2F*[ndim];
 163
 164   fRealOmega1 =new TH2F*[ndim];
 165   fMixAOmega1 =new TH2F*[ndim];
 166   fMixBOmega1 =new TH2F*[ndim];
 167   fMixCOmega1 =new TH2F*[ndim];
 168
 169   fRealOmega2 =new TH2F*[ndim];
 170   fMixAOmega2 =new TH2F*[ndim];
 171   fMixBOmega2 =new TH2F*[ndim];
 172   fMixCOmega2 =new TH2F*[ndim];
 173
 174   fhFakeOmega = new TH2F*[fNCentBin];
 175
 176   for(Int_t i=0;i<fNVtxZBin;i++){
 177     for(Int_t j=0;j<fNCentBin;j++){
 178       for(Int_t k=0;k<fNRpBin;k++){ //at event level
 179         Int_t idim=i*fNCentBin*fNRpBin+j*fNRpBin+k;
 180         for(Int_t ipid=0;ipid<fNpid;ipid++){
 181           for(Int_t idist=0;idist<fNBadChDistBin;idist++){ //at particle level
 182
 183             Int_t index=idim*fNpid*fNBadChDistBin+ipid*fNBadChDistBin+idist;
 184
 185             snprintf(key,buffersize,"RealToPi0Gamma_Vz%dC%dRp%dPid%dDist%d",i,j,k,ipid,idist);
 186             snprintf(title,buffersize, "%s Real Pi0GammaIVM vz_%2.1f_ct_%2.1f_Rp_%2.1f_pid_%d_dist_%d",detector,fVtxZCut[i],fCent[j],fRp[k],ipid,idist);
 187             fRealOmega0[index]=(TH2F*)fhEtalon->Clone(key) ;
 188             fRealOmega0[index]->SetName(key) ;
 189             fRealOmega0[index]->SetTitle(title);
 190             outputContainer->Add(fRealOmega0[index]);
 191
 192             snprintf(key,buffersize,"MixAToPi0Gamma_Vz%dC%dRp%dPid%dDist%d",i,j,k,ipid,idist);
 193             snprintf(title,buffersize, "%s MixA Pi0GammaIVM vz_%2.1f_ct_%2.1f_Rp_%2.1f_pid_%d_dist_%d",detector,fVtxZCut[i],fCent[j],fRp[k],ipid,idist);
 194             fMixAOmega0[index]=(TH2F*)fhEtalon->Clone(key) ;
 195             fMixAOmega0[index]->SetName(key) ;
 196             fMixAOmega0[index]->SetTitle(title);
 197             outputContainer->Add(fMixAOmega0[index]);
 198
 199             snprintf(key,buffersize,"MixBToPi0Gamma_Vz%dC%dRp%dPid%dDist%d",i,j,k,ipid,idist);
 200             snprintf(title,buffersize, "%s MixB Pi0GammaIVM vz_%2.1f_ct_%2.1f_Rp_%2.1f_pid_%d_dist_%d",detector,fVtxZCut[i],fCent[j],fRp[k],ipid,idist);
 201             fMixBOmega0[index]=(TH2F*)fhEtalon->Clone(key) ;
 202             fMixBOmega0[index]->SetName(key) ;
 203             fMixBOmega0[index]->SetTitle(title);
 204             outputContainer->Add(fMixBOmega0[index]);
 205
 206             snprintf(key,buffersize,"MixCToPi0Gamma_Vz%dC%dRp%dPid%dDist%d",i,j,k,ipid,idist);
 207             snprintf(title,buffersize, "%s MixC Pi0GammaIVM vz_%2.1f_ct_%2.1f_Rp_%2.1f_pid_%d_dist_%d",detector,fVtxZCut[i],fCent[j],fRp[k],ipid,idist);
 208             fMixCOmega0[index]=(TH2F*)fhEtalon->Clone(key) ;
 209             fMixCOmega0[index]->SetName(key) ;
 210             fMixCOmega0[index]->SetTitle(title);
 211             outputContainer->Add(fMixCOmega0[index]);
 212
 213             snprintf(key,buffersize,"RealToPi0Gamma1_Vz%dC%dRp%dPid%dDist%d",i,j,k,ipid,idist);
 214             snprintf(title,buffersize, "%s Real Pi0(A<0.7)GammaIVM vz_%2.1f_ct_%2.1f_Rp_%2.1f_pid_%d_dist_%d",detector,fVtxZCut[i],fCent[j],fRp[k],ipid,idist);
 215             fRealOmega1[index]=(TH2F*)fhEtalon->Clone(key) ;
 216             fRealOmega1[index]->SetName(key) ;
 217             fRealOmega1[index]->SetTitle(title);
 218             outputContainer->Add(fRealOmega1[index]);
 219
 220             snprintf(key,buffersize,"MixAToPi0Gamma1_Vz%dC%dRp%dPid%dDist%d",i,j,k,ipid,idist);
 221             snprintf(title,buffersize, "%s MixA Pi0(A<0.7)GammaIVM vz_%2.1f_ct_%2.1f_Rp_%2.1f_pid_%d_dist_%d",detector,fVtxZCut[i],fCent[j],fRp[k],ipid,idist);
 222             fMixAOmega1[index]=(TH2F*)fhEtalon->Clone(key) ;
 223             fMixAOmega1[index]->SetName(key) ;
 224             fMixAOmega1[index]->SetTitle(title);
 225             outputContainer->Add(fMixAOmega1[index]);
 226
 227             snprintf(key,buffersize,"MixBToPi0Gamma1_Vz%dC%dRp%dPid%dDist%d",i,j,k,ipid,idist);
 228             snprintf(title,buffersize, "%s MixB Pi0(A<0.7)GammaIVM vz_%2.1f_ct_%2.1f_Rp_%2.1f_pid_%d_dist_%d",detector,fVtxZCut[i],fCent[j],fRp[k],ipid,idist);
 229             fMixBOmega1[index]=(TH2F*)fhEtalon->Clone(key) ;
 230             fMixBOmega1[index]->SetName(key) ;
 231             fMixBOmega1[index]->SetTitle(title);
 232             outputContainer->Add(fMixBOmega1[index]);
 233
 234             snprintf(key,buffersize,"MixCToPi0Gamma1_Vz%dC%dRp%dPid%dDist%d",i,j,k,ipid,idist);
 235             snprintf(title,buffersize, "%s MixC Pi0(A<0.7)GammaIVM vz_%2.1f_ct_%2.1f_Rp_%2.1f_pid_%d_dist_%d",detector,fVtxZCut[i],fCent[j],fRp[k],ipid,idist);
 236             fMixCOmega1[index]=(TH2F*)fhEtalon->Clone(key) ;
 237             fMixCOmega1[index]->SetName(key) ;
 238             fMixCOmega1[index]->SetTitle(title);
 239             outputContainer->Add(fMixCOmega1[index]);
 240
 241             snprintf(key,buffersize,"RealToPi0Gamma2_Vz%dC%dRp%dPid%dDist%d",i,j,k,ipid,idist);
 242             snprintf(title,buffersize, "%s Real Pi0(A<0.8)GammaIVM vz_%2.1f_ct_%2.1f_Rp_%2.1f_pid_%d_dist_%d",detector,fVtxZCut[i],fCent[j],fRp[k],ipid,idist);
 243             fRealOmega2[index]=(TH2F*)fhEtalon->Clone(key) ;
 244             fRealOmega2[index]->SetName(key) ;
 245             fRealOmega2[index]->SetTitle(title);
 246             outputContainer->Add(fRealOmega2[index]);
 247
 248             snprintf(key,buffersize,"MixAToPi0Gamma2_Vz%dC%dRp%dPid%dDist%d",i,j,k,ipid,idist);
 249             snprintf(title,buffersize, "%s MixA Pi0(A<0.8)GammaIVM vz_%2.1f_ct_%2.1f_Rp_%2.1f_pid_%d_dist_%d",detector,fVtxZCut[i],fCent[j],fRp[k],ipid,idist);
 250             fMixAOmega2[index]=(TH2F*)fhEtalon->Clone(key) ;
 251             fMixAOmega2[index]->SetName(key) ;
 252             fMixAOmega2[index]->SetTitle(title);
 253             outputContainer->Add(fMixAOmega2[index]);
 254
 255             snprintf(key,buffersize,"MixBToPi0Gamma2_Vz%dC%dRp%dPid%dDist%d",i,j,k,ipid,idist);
 256             snprintf(title,buffersize, "%s MixB Pi0(A<0.8)GammaIVM vz_%2.1f_ct_%2.1f_Rp_%2.1f_pid_%d_dist_%d",detector,fVtxZCut[i],fCent[j],fRp[k],ipid,idist);
 257             fMixBOmega2[index]=(TH2F*)fhEtalon->Clone(key) ;
 258             fMixBOmega2[index]->SetName(key) ;
 259             fMixBOmega2[index]->SetTitle(title);
 260             outputContainer->Add(fMixBOmega2[index]);
 261
 262             snprintf(key,buffersize,"MixCToPi0Gamma2_Vz%dC%dRp%dPid%dDist%d",i,j,k,ipid,idist);
 263             snprintf(title,buffersize, "%s MixC Pi0(A<0.8)GammaIVM vz_%2.1f_ct_%2.1f_Rp_%2.1f_pid_%d_dist_%d",detector,fVtxZCut[i],fCent[j],fRp[k],ipid,idist);
 264             fMixCOmega2[index]=(TH2F*)fhEtalon->Clone(key) ;
 265             fMixCOmega2[index]->SetName(key) ;
 266             fMixCOmega2[index]->SetTitle(title);
 267             outputContainer->Add(fMixCOmega2[index]);
 268           }
 269         }
 270       }
 271     }
 272   }
 273
 274   for(Int_t i=0;i<fNCentBin;i++){
 275      snprintf(key,buffersize, "fhFakeOmega%d",i);
 276      snprintf(title,buffersize,"FakePi0(high pt cluster)+Gamma with Centrality%d",i);
 277      fhFakeOmega[i] = (TH2F*)fhEtalon->Clone(key);
 278      fhFakeOmega[i]->SetTitle(title);
 279      outputContainer->Add(fhFakeOmega[i]);
 280   }
 281   if(IsDataMC()){
 282     snprintf(key,buffersize, "%sOmegaPri",detector);
 283     snprintf(title,buffersize,"primary #omega in %s",detector);
 284     fhOmegaPriPt=new TH1F(key, title,nptbins,ptmin,ptmax);
 285     fhOmegaPriPt->GetXaxis()->SetTitle("P_{T}");
 286     fhOmegaPriPt->GetYaxis()->SetTitle("dN/P_{T}");
 287     outputContainer->Add(fhOmegaPriPt);
 288   }
 289
 290   delete fhEtalon;
 291   return outputContainer;
 292 }
 293
 294 //______________________________________________________________________________
 295 void AliAnaOmegaToPi0Gamma::Print(const Option_t * /*opt*/) const
 296 {
 297   //Print some relevant parameters set in the analysis
 298   printf("**** Print %s %s ****\n", GetName(), GetTitle() ) ;
 299   AliAnaPartCorrBaseClass::Print(" ");
 300   printf("Omega->pi0+gamma->3gamma\n");
 301   printf("Cuts at event level:            \n");
 302   printf("Bins of vertex Z:                     %d \n", fNVtxZBin);
 303   printf("Bins of centrality:                   %d \n",fNCentBin);
 304   printf("Bins of Reaction plane:               %d\n",fNRpBin);
 305   printf("Cuts at AOD particle level:\n");
 306   printf("Number of PID:                        %d \n", fNpid);
 307   printf("Number of DistToBadChannel cuts:      %d\n", fNBadChDistBin);
 308 }
 309
 310 //______________________________________________________________________________
 311 void AliAnaOmegaToPi0Gamma::MakeAnalysisFillHistograms()
 312 {
 313   //fill the MC AOD if needed first
 314   //-----------
 315   //need to be further implemented
 316   AliStack * stack = 0x0;
 317   // TParticle * primary = 0x0;
 318   TClonesArray * mcparticles0 = 0x0;
 319   //TClonesArray * mcparticles1 = 0x0;
 320   AliAODMCParticle * aodprimary = 0x0;
 321   Int_t pdg=0;
 322   Double_t pt=0;
 323   Double_t eta=0;
 324
 325   if(IsDataMC()){
 326     if(GetReader()->ReadStack()){
 327       stack =  GetMCStack() ;
 328       if(!stack){
 329         printf("AliAnaAcceptance::MakeAnalysisFillHistograms() - There is no stack!\n");
 330       }
 331       else{
 332         for(Int_t i=0 ; i<stack->GetNtrack(); i++){
 333           TParticle * prim = stack->Particle(i) ;
 334           pdg = prim->GetPdgCode() ;
 335           eta=prim->Eta();
 336           pt=prim->Pt();
 337           if(TMath::Abs(eta)<0.5) {
 338             if(pdg==223) fhOmegaPriPt->Fill(pt);
 339           }
 340         }
 341       }
 342     }
 343     else if(GetReader()->ReadAODMCParticles()){
 344       //Get the list of MC particles
 345       mcparticles0 = GetReader()->GetAODMCParticles(0);
 346       if(!mcparticles0 )     {
 347         if(GetDebug() > 0) printf("AliAnaAcceptance::MakeAnalysisFillHistograms() -  Standard MCParticles not available!\n");
 348       }
 349       //           if(GetReader()->GetSecondInputAODTree()){
 350       //               mcparticles1 = GetReader()->GetAODMCParticles(1);
 351       //               if(!mcparticles1 && GetDebug() > 0)     {
 352       //                   printf("AliAnaAcceptance::MakeAnalysisFillHistograms() -  Second input MCParticles not available!\n");
 353       //                }
 354       //           }
 355       else{
 356         for(Int_t i=0;i<mcparticles0->GetEntries();i++){
 357           aodprimary =(AliAODMCParticle*)mcparticles0->At(i);
 358           pdg = aodprimary->GetPdgCode() ;
 359           eta=aodprimary->Eta();
 360           pt=aodprimary->Pt();
 361           if(TMath::Abs(eta)<0.5) {
 362             if(pdg==223) fhOmegaPriPt->Fill(pt);
 363           }
 364
 365         }
 366       }//mcparticles0 exists
 367     }//AOD MC Particles
 368   }// is data and MC
 369
 370
 371   //process event from AOD brach
 372   //extract pi0, eta and omega analysis
 373   Int_t iRun=(GetReader()->GetInputEvent())->GetRunNumber() ;
 374   if(IsBadRun(iRun)) return ;
 375
 376   //vertex z
 377   Double_t vert[]={0,0,0} ;
 378   GetVertex(vert);
 379   Int_t curEventBin =0;
 380
 381   Int_t ivtxzbin=(Int_t)TMath::Abs(vert[2])/10;
 382   if(ivtxzbin>=fNVtxZBin)return;
 383
 384   //centrality
 385   Int_t currentCentrality = GetEventCentrality();
 386   if(currentCentrality == -1) return;
 387   Int_t optCent = GetReader()->GetCentralityOpt();
 388   Int_t icentbin=currentCentrality/(optCent/fNCentBin) ; //GetEventCentrality();
 389
 390   printf("-------------- %d  %d  %d  ",currentCentrality, optCent, icentbin);
 391   //reaction plane
 392   Int_t irpbin=0;
 393
 394   if(ivtxzbin==-1) return;
 395   curEventBin = ivtxzbin*fNCentBin*fNRpBin + icentbin*fNRpBin + irpbin;
 396   TClonesArray *aodGamma = (TClonesArray*) GetAODBranch(fInputAODGammaName); //photon array
 397   //  TClonesArray *aodGamma = (TClonesArray *) GetReader()->GetOutputEvent()->FindListObject(fInputAODGammaName); //photon array
 398   Int_t nphotons =0;
 399   if(aodGamma) nphotons= aodGamma->GetEntries();
 400   else return;
 401
 402   fInputAODPi0 = (TClonesArray*)GetInputAODBranch();  //pi0 array
 403   Int_t npi0s = 0;
 404   if(fInputAODPi0) npi0s= fInputAODPi0 ->GetEntries();
 405   else return;
 406
 407   if(nphotons<3 || npi0s<1)return; //for pi0, eta and omega->pi0+gamma->3gamma reconstruction
 408
 409   //reconstruction of omega(782)->pi0+gamma->3gamma
 410   //loop for pi0 and photon
 411   if(GetDebug() > 0) printf("omega->pi0+gamma->3gamma invariant mass analysis ! This event have %d photons and %d pi0 \n", nphotons, npi0s);
 412   for(Int_t i=0;i<npi0s;i++){
 413     AliAODPWG4Particle * pi0 = (AliAODPWG4Particle*) (fInputAODPi0->At(i)) ; //pi0
 414     TLorentzVector vpi0(pi0->Px(),pi0->Py(),pi0->Pz(),pi0->E());
 415     Int_t lab1=pi0->GetCaloLabel(0);  // photon1 from pi0 decay
 416     Int_t lab2=pi0->GetCaloLabel(1);  // photon2 from pi0 decay
 417     //for omega->pi0+gamma, it needs at least three photons per event
 418     //Get the two decay photons from pi0
 419     AliAODPWG4Particle * photon1 =0;
 420     AliAODPWG4Particle * photon2 =0;
 421     for(Int_t d1=0;d1<nphotons;d1++){
 422       for(Int_t d2=0;d2<nphotons;d2++){
 423         AliAODPWG4Particle * dp1 = (AliAODPWG4Particle*) (aodGamma->At(d1));
 424         AliAODPWG4Particle * dp2 = (AliAODPWG4Particle*) (aodGamma->At(d2));
 425         Int_t dlab1=dp1->GetCaloLabel(0);
 426         Int_t dlab2=dp2->GetCaloLabel(0);
 427         if(dlab1==lab1 && dlab2==lab2){
 428           photon1=dp1;
 429           photon2=dp2;
 430         }
 431         else continue;
 432       }
 433     }
 434     //caculate the asy and dist of the two photon from pi0 decay
 435     TLorentzVector dph1(photon1->Px(),photon1->Py(),photon1->Pz(),photon1->E());
 436     TLorentzVector dph2(photon2->Px(),photon2->Py(),photon2->Pz(),photon2->E());
 437
 438     Double_t pi0asy= TMath::Abs(dph1.E()-dph2.E())/(dph1.E()+dph2.E());
 439     //    Double_t phi1=dph1.Phi();
 440     //    Double_t phi2=dph2.Phi();
 441     //    Double_t eta1=dph1.Eta();
 442     //    Double_t eta2=dph2.Eta();
 443     //    Double_t pi0dist=TMath::Sqrt((phi1-phi2)*(phi1-phi2)+(eta1-eta2)*(eta1-eta2));
 444
 445     if(pi0->GetIdentifiedParticleType()==111  && nphotons>2 && npi0s
 446        && TMath::Abs(vpi0.M()-fPi0Mass)<fPi0MassWindow) { //pi0 candidates
 447
 448       //avoid the double counting
 449       Int_t * dc1= new Int_t[nphotons];
 450       Int_t * dc2= new Int_t[nphotons];
 451       Int_t index1=0;
 452       Int_t index2=0;
 453       for(Int_t k=0;k<i;k++){
 454         AliAODPWG4Particle * p3=(AliAODPWG4Particle*)(fInputAODPi0->At(k));
 455         Int_t lab4=p3->GetCaloLabel(0);
 456         Int_t lab5=p3->GetCaloLabel(1);
 457         if(lab1==lab4){ dc1[index1]=lab5;  index1++;  }
 458         if(lab2==lab5){ dc2[index2]=lab4;  index2++;  }
 459       }
 460
 461
 462       //loop the pi0 with third gamma
 463       for(Int_t j=0;j<nphotons;j++){
 464         AliAODPWG4Particle *photon3 = (AliAODPWG4Particle*) (aodGamma->At(j));
 465         TLorentzVector dph3(photon3->Px(),photon3->Py(),photon3->Pz(),photon3->E());
 466         Int_t lab3=photon3->GetCaloLabel(0);
 467         Double_t pi0gammapt=(vpi0+dph3).Pt();
 468         Double_t pi0gammamass=(vpi0+dph3).M();
 469         Double_t pi0OverOmegaPtRatio =vpi0.Pt()/pi0gammapt;
 470         Double_t gammaOverOmegaPtRatio= dph3.Pt()/pi0gammapt;
 471
 472         //pi0, gamma pt cut
 473         if(pi0OverOmegaPtRatio>fPi0OverOmegaPtCut ||
 474            gammaOverOmegaPtRatio<fGammaOverOmegaPtCut) continue;
 475
 476         for(Int_t l=0;l<index1;l++) if(lab3==dc1[l]) lab3=-1;
 477         for(Int_t l=0;l<index2;l++) if(lab3==dc2[l]) lab3=-1;
 478
 479         if(lab3>0 && lab3!=lab1 && lab3!=lab2){
 480                 for(Int_t ipid=0;ipid<fNpid;ipid++){
 481             for(Int_t idist=0;idist<fNBadChDistBin;idist++){
 482               Int_t index=curEventBin*fNpid*fNBadChDistBin+ipid*fNBadChDistBin+idist;
 483               if(photon1->IsPIDOK(ipid,AliCaloPID::kPhoton) &&
 484                  photon2->IsPIDOK(ipid,AliCaloPID::kPhoton) &&
 485                  photon3->IsPIDOK(ipid,AliCaloPID::kPhoton) &&
 486                  photon1->DistToBad()>=idist &&
 487                  photon2->DistToBad()>=idist &&
 488                  photon3->DistToBad()>=idist ){
 489                 //fill the histograms
 490                 if(GetDebug() > 2) printf("Real: index  %d  pt  %2.3f  mass   %2.3f \n", index, pi0gammapt, pi0gammamass);
 491                 fRealOmega0[index]->Fill(pi0gammapt,pi0gammamass);
 492                 if(pi0asy<0.7) fRealOmega1[index]->Fill(pi0gammapt,pi0gammamass);
 493                 if(pi0asy<0.8) fRealOmega2[index]->Fill(pi0gammapt,pi0gammamass);
 494               }
 495             }
 496                 }
 497         }
 498       }
 499       delete []dc1;
 500       delete []dc2;
 501       if(GetDebug() > 0) printf("MixA: (r1_event1+r2_event1)+r3_event2 \n");
 502       //-------------------------
 503       //background analysis
 504       //three background
 505       // --A   (r1_event1+r2_event1)+r3_event2
 506       Int_t nMixed = fEventsList[curEventBin]->GetSize();
 507       for(Int_t im=0;im<nMixed;im++){
 508         TClonesArray* ev2= (TClonesArray*) (fEventsList[curEventBin]->At(im));
 509         for(Int_t mix1=0;mix1<ev2->GetEntries();mix1++){
 510           AliAODPWG4Particle *mix1ph = (AliAODPWG4Particle*) (ev2->At(mix1));
 511           TLorentzVector vmixph(mix1ph->Px(),mix1ph->Py(),mix1ph->Pz(),mix1ph->E());
 512           Double_t pi0gammapt=(vpi0+vmixph).Pt();
 513           Double_t pi0gammamass=(vpi0+vmixph).M();
 514           Double_t pi0OverOmegaPtRatio =vpi0.Pt()/pi0gammapt;
 515           Double_t gammaOverOmegaPtRatio= vmixph.Pt()/pi0gammapt;
 516
 517           //pi0, gamma pt cut
 518           if(pi0OverOmegaPtRatio>fPi0OverOmegaPtCut ||
 519              gammaOverOmegaPtRatio<fGammaOverOmegaPtCut) continue;
 520
 521                 for(Int_t ipid=0;ipid<fNpid;ipid++){
 522             for(Int_t idist=0;idist<fNBadChDistBin;idist++){
 523               Int_t index=curEventBin*fNpid*fNBadChDistBin+ipid*fNBadChDistBin+idist;
 524               if(photon1->IsPIDOK(ipid,AliCaloPID::kPhoton)&&
 525                  photon2->IsPIDOK(ipid,AliCaloPID::kPhoton)&&
 526                  mix1ph->IsPIDOK(ipid,AliCaloPID::kPhoton) &&
 527                  photon1->DistToBad()>=idist &&
 528                  photon2->DistToBad()>=idist &&
 529                  mix1ph->DistToBad()>=idist ){
 530                 if(GetDebug() > 2) printf("MixA: index  %d   pt  %2.3f  mass   %2.3f \n",index, pi0gammapt, pi0gammamass);
 531                 //fill the histograms
 532                 fMixAOmega0[index]->Fill(pi0gammapt,pi0gammamass);
 533                 if(pi0asy<0.7)fMixAOmega1[index]->Fill(pi0gammapt,pi0gammamass);
 534                 if(pi0asy<0.8)fMixAOmega2[index]->Fill(pi0gammapt,pi0gammamass);
 535                 //printf("mix A  %d  %2.2f \n", index, pi0gammamass);
 536
 537               }
 538             }
 539           }
 540         }
 541       }
 542     }
 543   }
 544
 545   //
 546   // --B   (r1_event1+r2_event2)+r3_event2
 547   //
 548   if(GetDebug() >0)printf("MixB:  (r1_event1+r2_event2)+r3_event2 \n");
 549   for(Int_t i=0;i<nphotons;i++){
 550     AliAODPWG4Particle *ph1 = (AliAODPWG4Particle*) (aodGamma->At(i));
 551     TLorentzVector vph1(ph1->Px(),ph1->Py(),ph1->Pz(),ph1->E());
 552     //interrupt here...................
 553     //especially for EMCAL
 554     //we suppose the high pt clusters are overlapped pi0
 555
 556     for(Int_t j=i+1;j<nphotons;j++){
 557         AliAODPWG4Particle *ph2 = (AliAODPWG4Particle*) (aodGamma->At(j));
 558         TLorentzVector fakePi0, fakeOmega, vph;
 559
 560         if(ph1->E() > fEOverlapCluster && ph1->E() > ph2->E()) {
 561            fakePi0.SetPxPyPzE(ph1->Px(),ph1->Py(),ph1->Pz(),TMath::Sqrt(ph1->Px()*ph1->Px()+ph1->Py()*ph1->Py()+ph1->Pz()*ph1->Pz()+0.135*0.135));
 562            vph.SetPxPyPzE(ph2->Px(),ph2->Py(),ph2->Pz(),ph2->E());
 563         }
 564         else if(ph2->E() > fEOverlapCluster && ph2->E() > ph1->E()) {
 565            fakePi0.SetPxPyPzE(ph2->Px(),ph2->Py(),ph2->Pz(),TMath::Sqrt(ph2->Px()*ph2->Px()+ph2->Py()*ph2->Py()+ph2->Pz()*ph2->Pz()+0.135*0.135));
 566            vph.SetPxPyPzE(ph1->Px(), ph1->Py(),ph1->Pz(),ph1->E());
 567         }
 568         else continue;
 569
 570         fakeOmega=fakePi0+vph;
 571         for(Int_t ii=0;ii<fNCentBin;ii++){
 572            fhFakeOmega[icentbin]->Fill(fakeOmega.Pt(), fakeOmega.M());
 573         }
 574     }//j
 575
 576     //continue ................
 577     Int_t nMixed = fEventsList[curEventBin]->GetSize();
 578     for(Int_t ie=0;ie<nMixed;ie++){
 579       TClonesArray* ev2= (TClonesArray*) (fEventsList[curEventBin]->At(ie));
 580       for(Int_t mix1=0;mix1<ev2->GetEntries();mix1++){
 581         AliAODPWG4Particle *ph2 = (AliAODPWG4Particle*) (ev2->At(mix1));
 582         TLorentzVector vph2(ph2->Px(),ph2->Py(),ph2->Pz(),ph2->E());
 583         Double_t pi0asy = TMath::Abs(vph1.E()-vph2.E())/(vph1.E()+vph2.E());
 584         Double_t pi0mass=(vph1+vph2).M();
 585
 586         if(TMath::Abs(pi0mass-fPi0Mass)<fPi0MassWindow){//for pi0 selection
 587           for(Int_t mix2=(mix1+1);mix2<ev2->GetEntries();mix2++){
 588             AliAODPWG4Particle *ph3 = (AliAODPWG4Particle*) (ev2->At(mix2));
 589             TLorentzVector vph3(ph3->Px(),ph3->Py(),ph3->Pz(),ph3->E());
 590
 591             Double_t pi0gammapt=(vph1+vph2+vph3).Pt();
 592             Double_t pi0gammamass=(vph1+vph2+vph3).M();
 593             Double_t pi0OverOmegaPtRatio =(vph1+vph2).Pt()/pi0gammapt;
 594             Double_t gammaOverOmegaPtRatio= vph3.Pt()/pi0gammapt;
 595             //pi0, gamma pt cut
 596             if(pi0OverOmegaPtRatio>fPi0OverOmegaPtCut ||
 597                gammaOverOmegaPtRatio<fGammaOverOmegaPtCut) continue;
 598
 599             for(Int_t ipid=0;ipid<fNpid;ipid++){
 600               for(Int_t idist=0;idist<fNBadChDistBin;idist++){
 601                 Int_t index=curEventBin*fNpid*fNBadChDistBin+ipid*fNBadChDistBin+idist;
 602                 if(ph1->IsPIDOK(ipid,AliCaloPID::kPhoton) &&
 603                                ph2->IsPIDOK(ipid,AliCaloPID::kPhoton) &&
 604                    ph3->IsPIDOK(ipid,AliCaloPID::kPhoton) &&
 605                    ph1->DistToBad()>=idist &&
 606                    ph2->DistToBad()>=idist &&
 607                    ph3->DistToBad()>=idist ){
 608                   if(GetDebug() > 2) printf("MixB: index  %d   pt  %2.3f  mass   %2.3f \n", index, pi0gammapt, pi0gammamass);
 609                   //fill histograms
 610                   fMixBOmega0[index]->Fill(pi0gammapt,pi0gammamass);
 611                   if(pi0asy<0.7) fMixBOmega1[index]->Fill(pi0gammapt,pi0gammamass);
 612                   if(pi0asy<0.8) fMixBOmega2[index]->Fill(pi0gammapt,pi0gammamass);
 613                   //printf("mix B  %d  %2.2f \n", index, pi0gammamass);
 614                 }
 615               }
 616             }
 617           }
 618
 619           //
 620                 // --C   (r1_event1+r2_event2)+r3_event3
 621           //
 622           if(GetDebug() >0)printf("MixC: (r1_event1+r2_event2)+r3_event3\n");
 623           for(Int_t je=(ie+1);je<nMixed;je++){
 624             TClonesArray* ev3= (TClonesArray*) (fEventsList[curEventBin]->At(je));
 625             for(Int_t mix3=0;mix3<ev3->GetEntries();mix3++){
 626               AliAODPWG4Particle *ph3 = (AliAODPWG4Particle*) (ev3->At(mix3));
 627               TLorentzVector vph3(ph3->Px(),ph3->Py(),ph3->Pz(),ph3->E());
 628
 629               Double_t pi0gammapt=(vph1+vph2+vph3).Pt();
 630               Double_t pi0gammamass=(vph1+vph2+vph3).M();
 631               Double_t pi0OverOmegaPtRatio =(vph1+vph2).Pt()/pi0gammapt;
 632               Double_t gammaOverOmegaPtRatio= vph3.Pt()/pi0gammapt;
 633               //pi0, gamma pt cut
 634               if(pi0OverOmegaPtRatio>fPi0OverOmegaPtCut ||
 635                  gammaOverOmegaPtRatio<fGammaOverOmegaPtCut) continue;
 636
 637               for(Int_t ipid=0;ipid<fNpid;ipid++){
 638                 for(Int_t idist=0;idist<fNBadChDistBin;idist++){
 639                   Int_t index=curEventBin*fNpid*fNBadChDistBin+ipid*fNBadChDistBin+idist;
 640                   if(ph1->IsPIDOK(ipid,AliCaloPID::kPhoton) &&
 641                      ph2->IsPIDOK(ipid,AliCaloPID::kPhoton) &&
 642                      ph3->IsPIDOK(ipid,AliCaloPID::kPhoton) &&
 643                      ph1->DistToBad()>=idist &&
 644                      ph2->DistToBad()>=idist &&
 645                      ph3->DistToBad()>=idist ){
 646                     if(GetDebug() > 2) printf("MixC: index  %d  pt  %2.3f  mass   %2.3f \n", index, pi0gammapt, pi0gammamass);
 647                     //fill histograms
 648                     fMixCOmega0[index]->Fill(pi0gammapt,pi0gammamass);
 649                     if(pi0asy<0.7) fMixCOmega1[index]->Fill(pi0gammapt,pi0gammamass);
 650                     if(pi0asy<0.8) fMixCOmega2[index]->Fill(pi0gammapt,pi0gammamass);
 651                     //printf("mix C  %d  %2.2f \n", index, pi0gammamass);
 652                   }
 653                 }
 654               }
 655             }
 656           }
 657         } //for pi0 selecton
 658       }
 659     }
 660   }
 661
 662
 663   //event buffer
 664   TClonesArray *currentEvent = new TClonesArray(*aodGamma);
 665   if(currentEvent->GetEntriesFast()>0){
 666     fEventsList[curEventBin]->AddFirst(currentEvent) ;
 667     currentEvent=0 ;
 668     if(fEventsList[curEventBin]->GetSize()>=GetNMaxEvMix()) {
 669       TClonesArray * tmp = (TClonesArray*) (fEventsList[curEventBin]->Last()) ;
 670       fEventsList[curEventBin]->RemoveLast() ;
 671       delete tmp ;
 672     }
 673   }
 674   else{
 675     delete currentEvent ;
 676     currentEvent=0 ;
 677   }
 678
 679 }
 680
 681 //______________________________________________________________________________
 682 void AliAnaOmegaToPi0Gamma::ReadHistograms(TList * outputList)
 683 {
 684  //read the histograms
 685  //for the finalization of the terminate analysis
 686
 687  Int_t index = outputList->IndexOf(outputList->FindObject(GetAddedHistogramsStringToName()+"RealToPi0Gamma_Vz0C0Rp0Pid0Dist0"));
 688
 689   Int_t ndim=fNVtxZBin*fNCentBin*fNRpBin*fNBadChDistBin*fNpid;
 690
 691  if(!fRealOmega0) fRealOmega0 =new TH2F*[ndim];
 692  if(!fMixAOmega0) fMixAOmega0 =new TH2F*[ndim];
 693  if(!fMixBOmega0) fMixBOmega0 =new TH2F*[ndim];
 694  if(!fMixCOmega0) fMixCOmega0 =new TH2F*[ndim];
 695
 696  if(!fRealOmega1) fRealOmega1 =new TH2F*[ndim];
 697  if(!fMixAOmega1) fMixAOmega1 =new TH2F*[ndim];
 698  if(!fMixBOmega1) fMixBOmega1 =new TH2F*[ndim];
 699  if(!fMixCOmega1) fMixCOmega1 =new TH2F*[ndim];
 700
 701  if(!fRealOmega2) fRealOmega2 =new TH2F*[ndim];
 702  if(!fMixAOmega2) fMixAOmega2 =new TH2F*[ndim];
 703  if(!fMixBOmega2) fMixBOmega2 =new TH2F*[ndim];
 704  if(!fMixCOmega2) fMixCOmega2 =new TH2F*[ndim];
 705
 706   for(Int_t i=0;i<fNVtxZBin;i++){
 707      for(Int_t j=0;j<fNCentBin;j++){
 708          for(Int_t k=0;k<fNRpBin;k++){ //at event level
 709              Int_t idim=i*fNCentBin*fNRpBin+j*fNRpBin+k;
 710              for(Int_t ipid=0;ipid<fNpid;ipid++){
 711                 for(Int_t idist=0;idist<fNBadChDistBin;idist++){ //at particle
 712                     Int_t ind=idim*fNpid*fNBadChDistBin+ipid*fNBadChDistBin+idist;
 713                     fRealOmega0[ind]= (TH2F*) outputList->At(index++);
 714                     fMixAOmega0[ind]= (TH2F*) outputList->At(index++);
 715                     fMixBOmega0[ind]= (TH2F*) outputList->At(index++);
 716                     fMixCOmega0[ind]= (TH2F*) outputList->At(index++);
 717
 718                     fRealOmega1[ind]= (TH2F*) outputList->At(index++);
 719                     fMixAOmega1[ind]= (TH2F*) outputList->At(index++);
 720                     fMixBOmega1[ind]= (TH2F*) outputList->At(index++);
 721                     fMixCOmega1[ind]= (TH2F*) outputList->At(index++);
 722
 723                     fRealOmega2[ind]= (TH2F*) outputList->At(index++);
 724                     fMixAOmega2[ind]= (TH2F*) outputList->At(index++);
 725                     fMixBOmega2[ind]= (TH2F*) outputList->At(index++);
 726                     fMixCOmega2[ind]= (TH2F*) outputList->At(index++);
 727
 728
 729                 }
 730               }
 731           }
 732       }
 733   }
 734
 735   if(IsDataMC()){
 736      fhOmegaPriPt  = (TH1F*)  outputList->At(index++);
 737   }
 738
 739 }
 740
 741 //______________________________________________________________________________
 742 void AliAnaOmegaToPi0Gamma::Terminate(TList * outputList)
 743 {
 744 // //Do some calculations and plots from the final histograms.
 745   if(GetDebug() >= 0) printf("AliAnaOmegaToPi0Gamma::Terminate() \n");
 746   ReadHistograms(outputList);
 747   const Int_t buffersize = 255;
 748   char cvs1[buffersize];
 749   snprintf(cvs1, buffersize, "Neutral_%s_IVM",fInputAODGammaName.Data());
 750
 751   TCanvas * cvsIVM = new TCanvas(cvs1, cvs1, 400, 10, 600, 700) ;
 752   cvsIVM->Divide(2, 2);
 753
 754   cvsIVM->cd(1);
 755   char dec[buffersize];
 756   snprintf(dec,buffersize,"h2Real_%s",fInputAODGammaName.Data());
 757   TH2F * h2Real= (TH2F*)fRealOmega0[0]->Clone(dec);
 758   h2Real->GetXaxis()->SetRangeUser(4,6);
 759   TH1F * hRealOmega = (TH1F*) h2Real->ProjectionY();
 760   hRealOmega->SetTitle("RealPi0Gamma 4<pt<6");
 761   hRealOmega->SetLineColor(2);
 762   hRealOmega->Draw();
 763
 764   cvsIVM->cd(2);
 765   snprintf(dec,buffersize,"hMixA_%s",fInputAODGammaName.Data());
 766   TH2F *h2MixA= (TH2F*)fMixAOmega0[0]->Clone(dec);
 767   h2MixA->GetXaxis()->SetRangeUser(4,6);
 768   TH1F * hMixAOmega = (TH1F*) h2MixA->ProjectionY();
 769   hMixAOmega->SetTitle("MixA 4<pt<6");
 770   hMixAOmega->SetLineColor(2);
 771   hMixAOmega->Draw();
 772
 773   cvsIVM->cd(3);
 774   snprintf(dec,buffersize,"hMixB_%s",fInputAODGammaName.Data());
 775   TH2F * h2MixB= (TH2F*)fMixBOmega0[0]->Clone(dec);
 776   h2MixB->GetXaxis()->SetRangeUser(4,6);
 777   TH1F * hMixBOmega = (TH1F*) h2MixB->ProjectionY();
 778   hMixBOmega->SetTitle("MixB 4<pt<6");
 779   hMixBOmega->SetLineColor(2);
 780   hMixBOmega->Draw();
 781
 782   cvsIVM->cd(4);
 783   snprintf(dec,buffersize,"hMixC_%s",fInputAODGammaName.Data());
 784   TH2F *h2MixC= (TH2F*)fMixCOmega0[0]->Clone(dec);
 785   h2MixC->GetXaxis()->SetRangeUser(4,6);
 786   TH1F * hMixCOmega = (TH1F*) h2MixC->ProjectionY();
 787   hMixCOmega->SetTitle("MixC 4<pt<6");
 788   hMixCOmega->SetLineColor(2);
 789   hMixCOmega->Draw();
 790
 791   char eps[buffersize];
 792   snprintf(eps,buffersize,"CVS_%s_IVM.eps",fInputAODGammaName.Data());
 793   cvsIVM->Print(eps);
 794   cvsIVM->Modified();
 795
 796 }