PWG4/PartCorrDep/AliAnaPi0.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
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  15 /* $Id: $ */
  16
  17 //_________________________________________________________________________
  18 // Class to collect two-photon invariant mass distributions for
  19 // extractin raw pi0 yield.
  20 //
  21 //-- Author: Dmitri Peressounko (RRC "KI")
  22 //-- Adapted to PartCorr frame by Lamia Benhabib (SUBATECH)
  23 //-- and Gustavo Conesa (INFN-Frascati)
  24 //_________________________________________________________________________
  25
  26
  27 // --- ROOT system ---
  28 #include "TH3.h"
  29 //#include "Riostream.h"
  30
  31 //---- AliRoot system ----
  32 #include "AliAnaPi0.h"
  33 #include "AliCaloTrackReader.h"
  34 #include "AliCaloPID.h"
  35
  36 #ifdef __PHOSGEO__
  37         #include "AliPHOSGeoUtils.h"
  38 #endif
  39
  40 ClassImp(AliAnaPi0)
  41
  42 //________________________________________________________________________________________________________________________________________________
  43 AliAnaPi0::AliAnaPi0() : AliAnaPartCorrBaseClass(),
  44 fNCentrBin(0),fNZvertBin(0),fNrpBin(0),
  45 fNPID(0),fNmaxMixEv(0), fZvtxCut(0.),fCalorimeter(""),
  46 fEventsList(0x0), fhEtalon(0x0),
  47 fhRe1(0x0),fhMi1(0x0),fhRe2(0x0),fhMi2(0x0),fhRe3(0x0),fhMi3(0x0),fhEvents(0x0),
  48 fhPrimPt(0x0), fhPrimAccPt(0x0), fhPrimY(0x0), fhPrimAccY(0x0), fhPrimPhi(0x0), fhPrimAccPhi(0x0)
  49 {
  50 //Default Ctor
  51  InitParameters();
  52
  53 }
  54
  55 //________________________________________________________________________________________________________________________________________________
  56 AliAnaPi0::AliAnaPi0(const AliAnaPi0 & ex) : AliAnaPartCorrBaseClass(ex),
  57 fNCentrBin(ex.fNCentrBin),fNZvertBin(ex.fNZvertBin),fNrpBin(ex.fNrpBin),
  58 fNPID(ex.fNPID),fNmaxMixEv(ex.fNmaxMixEv),fZvtxCut(ex.fZvtxCut), fCalorimeter(ex.fCalorimeter),
  59 fEventsList(ex.fEventsList), fhEtalon(ex.fhEtalon),
  60 fhRe1(ex.fhRe1),fhMi1(ex.fhMi1),fhRe2(ex.fhRe2),fhMi2(ex.fhMi2),fhRe3(ex.fhRe3),fhMi3(ex.fhMi3),fhEvents(ex.fhEvents),
  61 fhPrimPt(ex.fhPrimPt), fhPrimAccPt(ex.fhPrimAccPt), fhPrimY(ex.fhPrimY),
  62 fhPrimAccY(ex.fhPrimAccY), fhPrimPhi(ex.fhPrimPhi), fhPrimAccPhi(ex.fhPrimAccPhi)
  63 {
  64         // cpy ctor
  65         //Do not need it
  66 }
  67
  68 //________________________________________________________________________________________________________________________________________________
  69 AliAnaPi0 & AliAnaPi0::operator = (const AliAnaPi0 & ex)
  70 {
  71         // assignment operator
  72
  73         if(this == &ex)return *this;
  74         ((AliAnaPartCorrBaseClass *)this)->operator=(ex);
  75
  76         fNCentrBin = ex.fNCentrBin  ; fNZvertBin = ex.fNZvertBin  ; fNrpBin = ex.fNrpBin  ;
  77         fNPID = ex.fNPID  ; fNmaxMixEv = ex.fNmaxMixEv  ; fZvtxCut = ex.fZvtxCut  ;  fCalorimeter = ex.fCalorimeter  ;
  78         fEventsList = ex.fEventsList  ;  fhEtalon = ex.fhEtalon  ;
  79         fhRe1 = ex.fhRe1  ; fhMi1 = ex.fhMi1  ; fhRe2 = ex.fhRe2  ; fhMi2 = ex.fhMi2  ;
  80         fhRe3 = ex.fhRe3  ; fhMi3 = ex.fhMi3  ; fhEvents = ex.fhEvents  ;
  81         fhPrimPt = ex.fhPrimPt  ;  fhPrimAccPt = ex.fhPrimAccPt  ;  fhPrimY = ex.fhPrimY  ;
  82         fhPrimAccY = ex.fhPrimAccY  ;  fhPrimPhi = ex.fhPrimPhi  ;  fhPrimAccPhi = ex.fhPrimAccPhi ;
  83
  84         return *this;
  85
  86 }
  87
  88 //________________________________________________________________________________________________________________________________________________
  89 AliAnaPi0::~AliAnaPi0() {
  90         // Remove event containers
  91         if(fEventsList){
  92                 for(Int_t ic=0; ic<fNCentrBin; ic++){
  93                         for(Int_t iz=0; iz<fNZvertBin; iz++){
  94                                 for(Int_t irp=0; irp<fNrpBin; irp++){
  95                                         fEventsList[ic*fNZvertBin*fNrpBin+iz*fNrpBin+irp]->Delete() ;
  96                                         delete fEventsList[ic*fNZvertBin*fNrpBin+iz*fNrpBin+irp] ;
  97                                 }
  98                         }
  99                 }
 100                 delete[] fEventsList;
 101                 fEventsList=0 ;
 102         }
 103
 104 #ifdef __PHOSGEO__
 105     if(fPHOSGeo) delete fPHOSGeo ;
 106 #endif
 107 }
 108
 109 //________________________________________________________________________________________________________________________________________________
 110 void AliAnaPi0::InitParameters()
 111 {
 112 //Init parameters when first called the analysis
 113 //Set default parameters
 114         SetInputAODName("photons");
 115         fNCentrBin = 1;
 116         fNZvertBin = 1;
 117         fNrpBin    = 1;
 118     fNPID      = 9;
 119         fNmaxMixEv = 10;
 120         fZvtxCut   = 40;
 121         fCalorimeter  = "PHOS";
 122 }
 123 //________________________________________________________________________________________________________________________________________________
 124 void AliAnaPi0::Init()
 125 {
 126 //Init some data members needed in analysis
 127
 128 //Histograms binning and range
 129         if(!fhEtalon){                                                   //  p_T      alpha   d m_gg
 130                 fhEtalon = new TH3D("hEtalon","Histo with binning parameters",50,0.,25.,10,0.,1.,200,0.,1.) ;
 131                 fhEtalon->SetXTitle("P_{T} (GeV)") ;
 132                 fhEtalon->SetYTitle("#alpha") ;
 133                 fhEtalon->SetZTitle("m_{#gamma#gamma} (GeV)") ;
 134         }
 135
 136
 137 //create event containers
 138         fEventsList = new TList*[fNCentrBin*fNZvertBin*fNrpBin] ;
 139
 140         for(Int_t ic=0; ic<fNCentrBin; ic++){
 141                 for(Int_t iz=0; iz<fNZvertBin; iz++){
 142                         for(Int_t irp=0; irp<fNrpBin; irp++){
 143                                 fEventsList[ic*fNZvertBin*fNrpBin+iz*fNrpBin+irp] = new TList() ;
 144                         }
 145                 }
 146         }
 147
 148                 //If Geometry library loaded, do geometry selection during analysis.
 149 #ifdef __PHOSGEO__
 150         printf("PHOS geometry initialized!\n");
 151         fPHOSGeo = new AliPHOSGeoUtils("PHOSgeo") ;
 152 #endif
 153
 154 }
 155
 156 //________________________________________________________________________________________________________________________________________________
 157 TList * AliAnaPi0::GetCreateOutputObjects()
 158 {
 159         // Create histograms to be saved in output file and
 160         // store them in fOutputContainer
 161
 162
 163         TList * outputContainer = new TList() ;
 164         outputContainer->SetName(GetName());
 165
 166         fhRe1=new TH3D*[fNCentrBin*fNPID] ;
 167         fhRe2=new TH3D*[fNCentrBin*fNPID] ;
 168         fhRe3=new TH3D*[fNCentrBin*fNPID] ;
 169         fhMi1=new TH3D*[fNCentrBin*fNPID] ;
 170         fhMi2=new TH3D*[fNCentrBin*fNPID] ;
 171         fhMi3=new TH3D*[fNCentrBin*fNPID] ;
 172
 173         char key[255] ;
 174         char title[255] ;
 175
 176         for(Int_t ic=0; ic<fNCentrBin; ic++){
 177                 for(Int_t ipid=0; ipid<fNPID; ipid++){
 178
 179                         //Distance to bad module 1
 180                         sprintf(key,"hRe_cen%d_pid%d_dist1",ic,ipid) ;
 181                         sprintf(title,"Real m_{#gamma#gamma} distr. for centrality=%d and PID=%d",ic,ipid) ;
 182
 183                         fhEtalon->Clone(key);
 184                         fhRe1[ic*fNPID+ipid]=(TH3D*)fhEtalon->Clone(key) ;
 185                         fhRe1[ic*fNPID+ipid]->SetName(key) ;
 186                         fhRe1[ic*fNPID+ipid]->SetTitle(title) ;
 187                         outputContainer->Add(fhRe1[ic*fNPID+ipid]) ;
 188
 189                         sprintf(key,"hMi_cen%d_pid%d_dist1",ic,ipid) ;
 190                         sprintf(title,"Mixed m_{#gamma#gamma} distr. for centrality=%d and PID=%d",ic,ipid) ;
 191                         fhMi1[ic*fNPID+ipid]=(TH3D*)fhEtalon->Clone(key) ;
 192                         fhMi1[ic*fNPID+ipid]->SetName(key) ;
 193                         fhMi1[ic*fNPID+ipid]->SetTitle(title) ;
 194                         outputContainer->Add(fhMi1[ic*fNPID+ipid]) ;
 195
 196                         //Distance to bad module 2
 197                         sprintf(key,"hRe_cen%d_pid%d_dist2",ic,ipid) ;
 198                         sprintf(title,"Real m_{#gamma#gamma} distr. for centrality=%d and PID=%d",ic,ipid) ;
 199                         fhRe2[ic*fNPID+ipid]=(TH3D*)fhEtalon->Clone(key) ;
 200                         fhRe2[ic*fNPID+ipid]->SetName(key) ;
 201                         fhRe2[ic*fNPID+ipid]->SetTitle(title) ;
 202                         outputContainer->Add(fhRe2[ic*fNPID+ipid]) ;
 203
 204                         sprintf(key,"hMi_cen%d_pid%d_dist2",ic,ipid) ;
 205                         sprintf(title,"Mixed m_{#gamma#gamma} distr. for centrality=%d and PID=%d",ic,ipid) ;
 206                         fhMi2[ic*fNPID+ipid]=(TH3D*)fhEtalon->Clone(key) ;
 207                         fhMi2[ic*fNPID+ipid]->SetName(key) ;
 208                         fhMi2[ic*fNPID+ipid]->SetTitle(title) ;
 209                         outputContainer->Add(fhMi2[ic*fNPID+ipid]) ;
 210
 211                         //Distance to bad module 3
 212                         sprintf(key,"hRe_cen%d_pid%d_dist3",ic,ipid) ;
 213                         sprintf(title,"Real m_{#gamma#gamma} distr. for centrality=%d and PID=%d",ic,ipid) ;
 214                         fhRe3[ic*fNPID+ipid]=(TH3D*)fhEtalon->Clone(key) ;
 215                         fhRe3[ic*fNPID+ipid]->SetName(key) ;
 216                         fhRe3[ic*fNPID+ipid]->SetTitle(title) ;
 217                         outputContainer->Add(fhRe3[ic*fNPID+ipid]) ;
 218
 219                         sprintf(key,"hMi_cen%d_pid%d_dist3",ic,ipid) ;
 220                         sprintf(title,"Mixed m_{#gamma#gamma} distr. for centrality=%d and PID=%d",ic,ipid) ;
 221                         fhMi3[ic*fNPID+ipid]=(TH3D*)fhEtalon->Clone(key) ;
 222                         fhMi3[ic*fNPID+ipid]->SetName(key) ;
 223                         fhMi3[ic*fNPID+ipid]->SetTitle(title) ;
 224                         outputContainer->Add(fhMi3[ic*fNPID+ipid]) ;
 225                 }
 226     }
 227
 228
 229         fhEvents=new TH3D("hEvents","Number of events",fNCentrBin,0.,1.*fNCentrBin,
 230                                           fNZvertBin,0.,1.*fNZvertBin,fNrpBin,0.,1.*fNrpBin) ;
 231         outputContainer->Add(fhEvents) ;
 232
 233         //Histograms filled only if MC data is requested
 234         if(IsDataMC() || (GetReader()->GetDataType() == AliCaloTrackReader::kMC) ){
 235                 if(fhEtalon->GetXaxis()->GetXbins() && fhEtalon->GetXaxis()->GetXbins()->GetSize()){ //Variable bin size
 236                         fhPrimPt = new TH1D("hPrimPt","Primary pi0 pt",fhEtalon->GetXaxis()->GetNbins(),fhEtalon->GetXaxis()->GetXbins()->GetArray()) ;
 237                         fhPrimAccPt = new TH1D("hPrimAccPt","Primary pi0 pt with both photons in acceptance",fhEtalon->GetXaxis()->GetNbins(),
 238                                                                    fhEtalon->GetXaxis()->GetXbins()->GetArray()) ;
 239                 }
 240                 else{
 241                         fhPrimPt = new TH1D("hPrimPt","Primary pi0 pt",fhEtalon->GetXaxis()->GetNbins(),fhEtalon->GetXaxis()->GetXmin(),fhEtalon->GetXaxis()->GetXmax()) ;
 242                         fhPrimAccPt = new TH1D("hPrimAccPt","Primary pi0 pt with both photons in acceptance",
 243                                                                    fhEtalon->GetXaxis()->GetNbins(),fhEtalon->GetXaxis()->GetXmin(),fhEtalon->GetXaxis()->GetXmax()) ;
 244                 }
 245                 outputContainer->Add(fhPrimPt) ;
 246                 outputContainer->Add(fhPrimAccPt) ;
 247
 248                 fhPrimY = new TH1D("hPrimaryRapidity","Rapidity of primary pi0",100,-5.,5.) ;
 249                 outputContainer->Add(fhPrimY) ;
 250
 251                 fhPrimAccY = new TH1D("hPrimAccRapidity","Rapidity of primary pi0",100,-5.,5.) ;
 252                 outputContainer->Add(fhPrimAccY) ;
 253
 254                 fhPrimPhi = new TH1D("hPrimaryPhi","Azimithal of primary pi0",180,0.,360.) ;
 255                 outputContainer->Add(fhPrimPhi) ;
 256
 257                 fhPrimAccPhi = new TH1D("hPrimAccPhi","Azimithal of primary pi0 with accepted daughters",180,-0.,360.) ;
 258                 outputContainer->Add(fhPrimAccPhi) ;
 259         }
 260
 261         //Save parameters used for analysis
 262         TString parList ; //this will be list of parameters used for this analysis.
 263         char onePar[255] ;
 264         sprintf(onePar,"--- AliAnaPi0 ---\n") ;
 265         parList+=onePar ;
 266         sprintf(onePar,"Number of bins in Centrality:  %d \n",fNCentrBin) ;
 267         parList+=onePar ;
 268         sprintf(onePar,"Number of bins in Z vert. pos: %d \n",fNZvertBin) ;
 269         parList+=onePar ;
 270         sprintf(onePar,"Number of bins in Reac. Plain: %d \n",fNrpBin) ;
 271         parList+=onePar ;
 272         sprintf(onePar,"Depth of event buffer: %d \n",fNmaxMixEv) ;
 273         parList+=onePar ;
 274         sprintf(onePar,"Number of different PID used:  %d \n",fNPID) ;
 275         parList+=onePar ;
 276         sprintf(onePar,"Cuts: \n") ;
 277         parList+=onePar ;
 278         sprintf(onePar,"Z vertex position: -%f < z < %f \n",fZvtxCut,fZvtxCut) ;
 279         parList+=onePar ;
 280         sprintf(onePar,"Calorimeter: %s \n",fCalorimeter.Data()) ;
 281         parList+=onePar ;
 282
 283         TObjString *oString= new TObjString(parList) ;
 284         outputContainer->Add(oString);
 285
 286         return outputContainer;
 287 }
 288
 289 //_________________________________________________________________________________________________________________________________________________
 290 void AliAnaPi0::Print(const Option_t * /*opt*/) const
 291 {
 292         //Print some relevant parameters set for the analysis
 293         AliAnaPartCorrBaseClass::Print(" ");
 294         printf("Class AliAnaPi0 for gamma-gamma inv.mass construction \n") ;
 295         printf("Number of bins in Centrality:  %d \n",fNCentrBin) ;
 296         printf("Number of bins in Z vert. pos: %d \n",fNZvertBin) ;
 297         printf("Number of bins in Reac. Plain: %d \n",fNrpBin) ;
 298         printf("Depth of event buffer: %d \n",fNmaxMixEv) ;
 299         printf("Number of different PID used:  %d \n",fNPID) ;
 300         printf("Cuts: \n") ;
 301         printf("Z vertex position: -%2.3f < z < %2.3f \n",fZvtxCut,fZvtxCut) ;
 302         printf("------------------------------------------------------\n") ;
 303 }
 304
 305
 306 //____________________________________________________________________________________________________________________________________________________
 307 void AliAnaPi0:: MakeAnalysisFillHistograms()
 308 {
 309         //Process one event and extract photons from AOD branch
 310         // filled with AliAnaPhoton and fill histos with invariant mass
 311
 312         //Apply some cuts on event: vertex position and centrality range
 313         Int_t iRun=(GetReader()->GetInputEvent())->GetRunNumber() ;
 314         if(IsBadRun(iRun)) return ;
 315
 316         Double_t vert[]={0,0,0} ; //vertex ;
 317         GetReader()->GetVertex(vert);
 318         if(vert[2]<-fZvtxCut || vert[2]> fZvtxCut) return ; //Event can not be used (vertex, centrality,... cuts not fulfilled)
 319
 320         //Get Centrality and calculate centrality bin
 321         //Does not exist in ESD yet???????
 322         Int_t curCentrBin=0 ;
 323
 324         //Get Reaction Plain position and calculate RP bin
 325         //does not exist in ESD yet????
 326         Int_t curRPBin=0 ;
 327
 328         Int_t curZvertBin=(Int_t)(0.5*fNZvertBin*(vert[2]+fZvtxCut)/fZvtxCut) ;
 329
 330         fhEvents->Fill(curCentrBin+0.5,curZvertBin+0.5,curRPBin+0.5) ;
 331
 332         Int_t nPhot = GetInputAODBranch()->GetEntriesFast() ;
 333         if(GetDebug() > 1) printf("AliAnaPi0::FillHistos: photon entries %d\n", nPhot);
 334
 335         for(Int_t i1=0; i1<nPhot-1; i1++){
 336                 AliAODPWG4Particle * p1 = (AliAODPWG4Particle*) (GetInputAODBranch()->At(i1)) ;
 337                 TLorentzVector photon1(p1->Px(),p1->Py(),p1->Pz(),p1->E());
 338                 for(Int_t i2=i1+1; i2<nPhot; i2++){
 339                         AliAODPWG4Particle * p2 = (AliAODPWG4Particle*) (GetInputAODBranch()->At(i2)) ;
 340                         TLorentzVector photon2(p2->Px(),p2->Py(),p2->Pz(),p2->E());
 341                         Double_t m  = (photon1 + photon2).M() ;
 342                         Double_t pt = (photon1 + photon2).Pt();
 343                         Double_t a  = TMath::Abs(p1->E()-p2->E())/(p1->E()+p2->E()) ;
 344                         if(GetDebug() > 2)
 345                                 printf("AliAnaPi0::FillHistos: Current Event: pT: photon1 %2.2f, photon2 %2.2f; Pair: pT %2.2f, mass %2.3f, a %f2.3\n",
 346                                                 p1->Pt(), p2->Pt(), pt,m,a);
 347                         for(Int_t ipid=0; ipid<fNPID; ipid++)
 348                         {
 349                                 if((p1->IsPIDOK(ipid,AliCaloPID::kPhoton)) && (p2->IsPIDOK(ipid,AliCaloPID::kPhoton))){
 350                                         fhRe1[curCentrBin*fNPID+ipid]->Fill(pt,a,m) ;
 351                                         if(p1->DistToBad()>0 && p2->DistToBad()>0){
 352                                                 fhRe2[curCentrBin*fNPID+ipid]->Fill(pt,a,m) ;
 353                                                 if(p1->DistToBad()>1 && p2->DistToBad()>1){
 354                                                         fhRe3[curCentrBin*fNPID+ipid]->Fill(pt,a,m) ;
 355                                                 }
 356                                         }
 357                                 }
 358                         }
 359                 }
 360         }
 361
 362         //Fill mixed
 363
 364         TList * evMixList=fEventsList[curCentrBin*fNZvertBin*fNrpBin+curZvertBin*fNrpBin+curRPBin] ;
 365         Int_t nMixed = evMixList->GetSize() ;
 366         for(Int_t ii=0; ii<nMixed; ii++){
 367                 TClonesArray* ev2= (TClonesArray*) (evMixList->At(ii));
 368                 Int_t nPhot2=ev2->GetEntriesFast() ;
 369                 Double_t m = -999;
 370                 if(GetDebug() > 1) printf("AliAnaPi0::FillHistos: Mixed event %d photon entries %d\n", ii, nPhot);
 371
 372                 for(Int_t i1=0; i1<nPhot; i1++){
 373                         AliAODPWG4Particle * p1 = (AliAODPWG4Particle*) (GetInputAODBranch()->At(i1)) ;
 374                         TLorentzVector photon1(p1->Px(),p1->Py(),p1->Pz(),p1->E());
 375                         for(Int_t i2=0; i2<nPhot2; i2++){
 376                                 AliAODPWG4Particle * p2 = (AliAODPWG4Particle*) (ev2->At(i2)) ;
 377
 378                                 TLorentzVector photon2(p2->Px(),p2->Py(),p2->Pz(),p2->E());
 379                                 m =           (photon1+photon2).M() ;
 380                                 Double_t pt = (photon1 + photon2).Pt();
 381                                 Double_t a  = TMath::Abs(p1->E()-p2->E())/(p1->E()+p2->E()) ;
 382                                 if(GetDebug() > 2)
 383                                         printf("AliAnaPi0::FillHistos: Mixed Event: pT: photon1 %2.2f, photon2 %2.2f; Pair: pT %2.2f, mass %2.3f, a %f2.3\n",
 384                                                         p1->Pt(), p2->Pt(), pt,m,a);
 385                                 for(Int_t ipid=0; ipid<fNPID; ipid++){
 386                                 if((p1->IsPIDOK(ipid,AliCaloPID::kPhoton)) && (p2->IsPIDOK(ipid,AliCaloPID::kPhoton))){
 387                                                 fhMi1[curCentrBin*fNPID+ipid]->Fill(pt,a,m) ;
 388                                                 if(p1->DistToBad()>0 && p2->DistToBad()>0){
 389                                                         fhMi2[curCentrBin*fNPID+ipid]->Fill(pt,a,m) ;
 390                                                         if(p1->DistToBad()>1 && p2->DistToBad()>1){
 391                                                                 fhMi3[curCentrBin*fNPID+ipid]->Fill(pt,a,m) ;
 392                                                         }
 393
 394                                                 }
 395                                         }
 396                                 }
 397                         }
 398                 }
 399         }
 400
 401         TClonesArray *currentEvent = new TClonesArray(*GetInputAODBranch());
 402         //Add current event to buffer and Remove redandant events
 403         if(currentEvent->GetEntriesFast()>0){
 404                 evMixList->AddFirst(currentEvent) ;
 405                 currentEvent=0 ; //Now list of particles belongs to buffer and it will be deleted with buffer
 406                 if(evMixList->GetSize()>=fNmaxMixEv)
 407                 {
 408                         TClonesArray * tmp = (TClonesArray*) (evMixList->Last()) ;
 409                         evMixList->RemoveLast() ;
 410                         delete tmp ;
 411                 }
 412         }
 413         else{ //empty event
 414                 delete currentEvent ;
 415                 currentEvent=0 ;
 416         }
 417
 418         //Acceptance
 419         AliStack * stack = GetMCStack();
 420         if(stack && (IsDataMC() || (GetReader()->GetDataType() == AliCaloTrackReader::kMC)) ){
 421                 for(Int_t i=0 ; i<stack->GetNprimary(); i++){
 422                         TParticle * prim = stack->Particle(i) ;
 423                         if(prim->GetPdgCode() == 111){
 424                                 Double_t pi0Pt = prim->Pt() ;
 425                                 //printf("pi0, pt %2.2f\n",pi0Pt);
 426                                 Double_t pi0Y  = 0.5*TMath::Log((prim->Energy()-prim->Pz())/(prim->Energy()+prim->Pz())) ;
 427                                 Double_t phi   = TMath::RadToDeg()*prim->Phi() ;
 428                                 if(TMath::Abs(pi0Y) < 0.5){
 429                                         fhPrimPt->Fill(pi0Pt) ;
 430                                 }
 431                                 fhPrimY  ->Fill(pi0Y) ;
 432                                 fhPrimPhi->Fill(phi) ;
 433
 434                                 //Check if both photons hit Calorimeter
 435                                 Int_t iphot1=prim->GetFirstDaughter() ;
 436                                 Int_t iphot2=prim->GetLastDaughter() ;
 437                                 if(iphot1>-1 && iphot1<stack->GetNtrack() && iphot2>-1 && iphot2<stack->GetNtrack()){
 438                                         TParticle * phot1 = stack->Particle(iphot1) ;
 439                                         TParticle * phot2 = stack->Particle(iphot2) ;
 440                                         if(phot1 && phot2 && phot1->GetPdgCode()==22 && phot2->GetPdgCode()==22){
 441                                                 //printf("2 photons: photon 1: pt %2.2f, phi %3.2f, eta %1.2f; photon 2: pt %2.2f, phi %3.2f, eta %1.2f\n",
 442                                                 //      phot1->Pt(), phot1->Phi()*180./3.1415, phot1->Eta(), phot2->Pt(), phot2->Phi()*180./3.1415, phot2->Eta());
 443                                                 Bool_t inacceptance = kFALSE;
 444 #ifdef __PHOSGEO__
 445                                                 Int_t mod ;
 446                                                 Double_t x,z ;
 447                                                 if(fCalorimeter == "PHOS" && fPHOSGeo->ImpactOnEmc(phot1,mod,z,x) && fPHOSGeo->ImpactOnEmc(phot1,mod,z,x))
 448                                                         inacceptance = kTRUE;
 449                                                 //printf("In REAL PHOS acceptance? %d\n",inacceptance);
 450 #else
 451                                                 TLorentzVector lv1, lv2;
 452                                                 phot1->Momentum(lv1);
 453                                                 phot2->Momentum(lv2);
 454                                                 if(GetFidutialCut()->IsInFidutialCut(lv1,fCalorimeter) && GetFidutialCut()->IsInFidutialCut(lv2,fCalorimeter))
 455                                                         inacceptance = kTRUE ;
 456                                                 //printf("In %s fidutial cut acceptance? %d\n",fCalorimeter.Data(),inacceptance);
 457 #endif
 458                                                 if(inacceptance){
 459                                                         fhPrimAccPt->Fill(pi0Pt) ;
 460                                                         fhPrimAccPhi->Fill(phi) ;
 461                                                         fhPrimAccY->Fill(pi0Y) ;
 462                                                 }//Accepted
 463                                         }// 2 photons
 464                                 }//Check daughters exist
 465                         }// Primary pi0
 466                 }//loop on primaries
 467         }//stack exists and data is MC
 468
 469 }
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