9b07afd7bdc9e9055d5a78d8581cd53ee8e875c0
[u/mrichter/AliRoot.git] / PHOS / AnaPhotons_v1.C
1 //===============================================================
2 // In this Macro (which can (must) be compilated), you will find all the 
3 // analysis functions to build photon spectrum, invariant mass 
4 // spectrum of photon  pairs and combinatorial background calculations 
5 // in ALICE electromagnetic calorimeter
6 // Author: Gines MARTINEZ, Subatech, 15 june 2001
7 //============================================================== 
8 #include "TH2.h"
9 #include "TH1.h"
10 #include "TFile.h"
11 #include "TRandom.h"
12 #include "TObjectTable.h"
13 #include "AliPHOSIndexToObject.h"
14 #include "AliPHOSRecParticle.h"
15 #include "TLorentzVector.h"
16 #include "TGraphErrors.h"
17 #include "TF1.h"
18
19 TObjectTable * gObjectTable;
20 TRandom * gRandom;
21
22
23 void AnaMinv(char * filename)
24 {
25   TH2F * h_Minv_lowpT       = new TH2F("h_Minv_lowpT","Minv vs pT low",500,0.0,1.0,40,0.,10.);
26   TH2F * h_Minv_highpT      = new TH2F("h_Minv_highpT","Minv vs pT high",500,0.0,1.0,50,0.,100.);
27   TH2F * h_Minv_lowpT_back  = new TH2F("h_Minv_lowpT_back","Minv vs pT low back",500,0.0,1.0,40,0.,10.);
28   TH2F * h_Minv_highpT_back = new TH2F("h_Minv_highpT_back","Minv vs pT high back",500,0.0,1.0,50,0.,100.);
29
30
31   TH1F * h_Pseudoeta = new TH1F("h_Pseudoeta","Pseudoeta photons",500,-1.0,1.0);
32   TH1F * h_Pt        = new TH1F("h_Pt","Pt photons",400,0.,10.);
33   TH2F * h_Peta_Pt   = new TH2F("h_Peta_Pt","Pseudo vs pT",40,0.,10.,50,-1.0,1.0);
34   TH1F * h_Phi       = new TH1F("h_Phi","Phi photons",400,-4.,4.);
35   TH2F * h_Peta_Phi  = new TH2F("h_Peta_Phi","Pseudo vs Phi",200,-4,4,200,-1.0,1.0);
36
37   TH1F * h_DeltaR   = new TH1F("h_DeltaR","Delta R",400,0,4);
38   TH1F * h_Asymmetry= new TH1F("h_Asymmetry","Asymmetry",400, -2., 2.);
39
40   AliPHOSIndexToObject * RecData = AliPHOSIndexToObject::GetInstance(filename)  ;
41  
42   AliPHOSRecParticle * RecParticle1;
43   AliPHOSRecParticle * RecParticle2;
44  
45
46   Float_t RelativeRCut = 0.0001 ; 
47   Float_t AsymmetryCut = 0.7 ;
48   Float_t Asymmetry;
49
50   Int_t iEvent, iRecParticle1, iRecParticle2;
51   Int_t nRecParticle;
52   Float_t invariant_mass, invariant_mass_mixed;
53   TLorentzVector P_photon1, P_photon2, P_photonMixed1, P_photonMixed2 ;
54   Float_t average_multiplicity = 0.;
55
56   for(iEvent=0; iEvent<RecData->GetMaxEvent(); iEvent++)
57     //  for(iEvent=0; iEvent<1000; iEvent++)
58     {
59       //     if (iEvent==2) gObjectTable->Print();
60       //if (iEvent==15) gObjectTable->Print();
61       RecData->GetEvent(iEvent);
62       printf(">>> Event %d \n",iEvent);
63       nRecParticle=RecData->GimeNRecParticles();
64       average_multiplicity += ((Float_t) (nRecParticle) ) / ( (Float_t)RecData->GetMaxEvent() ) ;
65       // Construction de la masse invariante des pairs
66       if (nRecParticle > 1) 
67         {
68           for(iRecParticle1=0; iRecParticle1<nRecParticle; iRecParticle1++)
69             {
70               RecParticle1 = (AliPHOSRecParticle *)  RecData->GimeRecParticle(iRecParticle1);
71               RecParticle1->Momentum(P_photon1);
72
73               h_Pseudoeta->Fill(P_photon1.PseudoRapidity());
74               h_Pt->Fill(P_photon1.Pt());
75               h_Phi->Fill(P_photon1.Phi());
76               h_Peta_Pt->Fill(P_photon1.Pt(), P_photon1.PseudoRapidity());
77               h_Peta_Phi->Fill(P_photon1.Phi(), P_photon1.PseudoRapidity() );
78          
79               for(iRecParticle2=iRecParticle1+1; iRecParticle2<nRecParticle; iRecParticle2++)
80                 {
81                   RecParticle2 = (AliPHOSRecParticle *)  RecData->GimeRecParticle(iRecParticle2);
82                   RecParticle2->Momentum(P_photon2); 
83                   Asymmetry = TMath::Abs((P_photon1.E()-P_photon2.E())/(P_photon1.E()+P_photon2.E()));
84                   if ( (P_photon1 != P_photon2) && 
85                        (P_photon1.DeltaR(P_photon2) > RelativeRCut) &&
86                        (Asymmetry < AsymmetryCut)                          )
87                     {
88                       h_DeltaR->Fill(P_photon1.DeltaR(P_photon2));
89                       h_Asymmetry->Fill( Asymmetry );
90
91                       //   printf("A. p1 es %f \n",P_photon1->E());
92                       invariant_mass = (P_photon1 + P_photon2).M();
93                       // printf("B. p1 es %f \n",P_photon1->E());
94                       h_Minv_lowpT->Fill(invariant_mass, (P_photon1 + P_photon2).Pt() );
95                       h_Minv_highpT->Fill(invariant_mass,(P_photon1 + P_photon2).Pt() );
96                     }  
97                 }
98             }
99         }
100     }
101   printf(">>> Average Multiplicity is %f \n",average_multiplicity);
102   Int_t Background = (Int_t)  (RecData->GetMaxEvent() * average_multiplicity * (average_multiplicity-1.)/2.) ;
103   printf(">>> Background is %d \n",Background);
104
105   Double_t Pt_Mixed1, Pt_Mixed2;
106   Double_t Y_Mixed1, Y_Mixed2;
107   Double_t Phi_Mixed1, Phi_Mixed2;
108
109   for(iEvent=0; iEvent<Background; iEvent++)
110     {
111       //      printf(">>> Background Event %d \n",iEvent);
112       Pt_Mixed1 =  h_Pt->GetRandom(); 
113       Pt_Mixed2 =  h_Pt->GetRandom();
114       h_Peta_Phi->GetRandom2(Phi_Mixed1, Y_Mixed1);
115       h_Peta_Phi->GetRandom2(Phi_Mixed2, Y_Mixed2);
116       P_photonMixed1.SetPtEtaPhiM( Pt_Mixed1, Y_Mixed1, Phi_Mixed1, 0.0);
117       P_photonMixed2.SetPtEtaPhiM( Pt_Mixed2, Y_Mixed2, Phi_Mixed2, 0.0);
118       Asymmetry = TMath::Abs((P_photonMixed1.E()-P_photonMixed2.E())/(P_photonMixed1.E()+P_photonMixed2.E()));
119       
120       if ( (P_photonMixed1.DeltaR(P_photonMixed2) > RelativeRCut) &&
121            (Asymmetry < AsymmetryCut  )                               )
122         {
123           invariant_mass_mixed = (P_photonMixed1 + P_photonMixed2).M();
124           h_Minv_lowpT_back->Fill(invariant_mass_mixed, (P_photonMixed1 + P_photonMixed2).Pt() );
125           h_Minv_highpT_back->Fill(invariant_mass_mixed,(P_photonMixed1 + P_photonMixed2).Pt() );
126         }  
127     }
128   
129
130   char outputname[80];
131   sprintf(outputname,"%s.Minv",filename);
132   TFile output(outputname,"recreate");
133   h_Minv_lowpT->Write();
134   h_Minv_highpT->Write();
135   h_Minv_lowpT_back->Write();  
136   h_Minv_highpT_back->Write();
137   h_Pseudoeta->Write();
138   h_Pt->Write();
139   h_Peta_Pt->Write();
140   h_Phi->Write();
141   h_Peta_Phi->Write();
142   h_Asymmetry->Write();
143   h_DeltaR->Write();
144   
145   output.Close();
146 }
147
148
149 void AnaPtSpectrum(char * filename, Int_t NumberPerPtBin, Option_t * particle, Option_t * opt)
150 {
151
152   Int_t NumberOfPtBins = NumberPerPtBin;
153   Float_t PtCalibration = 0.250;
154
155   TFile * in = new TFile(filename);
156
157   TH2F * h_Minv_pT = 0;  
158   TH2F * h_Minv_pT_back = 0; 
159   TH2F * frame = 0 ;
160
161   if (strstr(opt,"low"))
162     {
163       h_Minv_pT      = (TH2F *) in->Get("h_Minv_lowpT"); ;
164       h_Minv_pT_back = (TH2F *) in->Get("h_Minv_lowpT_back");
165       PtCalibration  = 0.250;   
166       frame = new TH2F("PtSpectrumlow","Pt Spectrum low",10, 0.,10.,10,0.1,10000);
167     }  
168   if (strstr(opt,"high"))
169     {
170       h_Minv_pT      = (TH2F *) in->Get("h_Minv_highpT"); ;
171       h_Minv_pT_back = (TH2F *) in->Get("h_Minv_highpT_back");
172       PtCalibration = 2.5;
173       frame = new TH2F("PtSpectrumhigh","Pt Spectrum high",10, 0.,100.,10,0.1,10000);
174     }
175
176   if ( h_Minv_pT == 0 ) 
177     {
178       printf(">>> Bad Option! \n");
179       return;
180     }
181   Int_t Norma_1 = 100; Float_t Norma_minv_1 = 0.2;
182   Int_t Norma_2 = 200; Float_t Norma_minv_2 = 0.4;
183
184   Int_t Minv_1 = 56;
185   Int_t Minv_2 = 76;
186   if (strstr(particle,"eta"))
187     {
188       Minv_1 = 234;
189       Minv_2 = 314;
190     }
191
192   if (strstr(particle,"norma"))
193     {
194       Minv_1 = 100;
195       Minv_2 = 200;
196     }
197   
198   Int_t NHistos = 40/NumberOfPtBins;
199   Int_t iHistos;
200
201   TH1D * signal = 0;
202   TH1D * background = 0;
203   TH1D * ratio = 0;
204   TH1D * difference = 0;
205
206   Float_t Pt[NHistos];
207   Float_t PtError[NHistos];
208   Float_t Nmesons[NHistos];
209   Float_t NmesonsError[NHistos];
210
211   Float_t Ntota, Nback, Norma, NormaError, Renorma;
212
213   for(iHistos=0; iHistos<NHistos; iHistos++)
214     {
215       signal     = h_Minv_pT->ProjectionX("signal",         NumberOfPtBins*iHistos+1,NumberOfPtBins*(iHistos+1));
216       background = h_Minv_pT_back->ProjectionX("background",NumberOfPtBins*iHistos+1,NumberOfPtBins*(iHistos+1));
217       //signal->Rebin();
218       //background->Rebin();
219       ratio = new TH1D(*signal);
220       ratio->Sumw2(); 
221       ratio->Add(background,-1.0);
222       ratio->Divide(background);
223       difference = new TH1D(*signal);
224       difference->Sumw2();
225       ratio->Fit("pol0","","",Norma_minv_1,Norma_minv_2); 
226       if (background->Integral(Norma_1,Norma_2) == 0)
227         Renorma = 0.;
228       else
229         Renorma = signal->Integral(Norma_1,Norma_2)/background->Integral(Norma_1,Norma_2);
230       difference->Add(background,(-1.)*Renorma); 
231        
232       //ratio->Draw();
233       //      background->Draw("same");
234       //     difference->Draw();
235
236       Ntota = signal->Integral(Minv_1,Minv_2);
237       Nback = background->Integral(Minv_1,Minv_2);
238       Norma = ratio->GetFunction("pol0")->GetParameter(0);
239       if (Renorma == 0.)
240         NormaError = 0.;
241       else
242         NormaError =  ratio->GetFunction("pol0")->GetParError(0);
243       printf("Ntotal %f Nback %f Norma %f and NormaError %f \n",Ntota, Nback, Norma, NormaError);
244       printf("differencia is %f \n",difference->Integral(Minv_1,Minv_2));
245       Nmesons[iHistos] = Ntota - Renorma * Nback;
246       NmesonsError[iHistos] = TMath::Sqrt( Ntota + Nback*Renorma*Renorma + Nback*Nback*NormaError*NormaError );  
247       Pt[iHistos] = (iHistos+0.5)*NumberOfPtBins*PtCalibration;
248       PtError[iHistos] = NumberOfPtBins*PtCalibration/2.; 
249       //   ratio->Delete("");
250       //difference->Delete("");
251     }
252   // in->Close();
253
254
255   char filenameout[80];
256   sprintf(filenameout,"%s.PtSpectrum_%d_%s_%s",filename, NumberPerPtBin, particle, opt);
257   TFile out(filenameout,"recreate");
258   TGraphErrors * PtSpectrum = new TGraphErrors(NHistos, Pt, Nmesons, PtError, NmesonsError);
259   PtSpectrum->SetName("PtSpectrum");
260   PtSpectrum->Write();
261   out.Close();
262
263   frame->Draw();
264   frame->SetStats(0);
265   frame->SetXTitle("Neutral meson pT (GeV/c)");
266   frame->SetYTitle("Number of neutral mesons per pT bin");
267   PtSpectrum->SetMarkerStyle(27);
268   PtSpectrum->Draw("P");
269
270 }