PartCorr split in 2 Base and Dep; coding violations corrected; PHOS geometry can...
[u/mrichter/AliRoot.git] / 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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