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 "TTree.h"
  12 #include "TRandom.h"
  13 #include "TObjectTable.h"
  14 #include "AliRun.h"
  15 #include "AliPHOSGetter.h"
  16 #include "AliPHOSRecParticle.h"
  17 #include "TLorentzVector.h"
  18 #include "TGraphErrors.h"
  19 #include "TF1.h"
  20
  21 TObjectTable * gObjectTable;
  22 TRandom      * gRandom;
  23 AliRun       * gAlice;
  24
  25
  26 void AnaMinv(char * filename)
  27 {
  28   TH2F * h_Minv_lowpT       = new TH2F("h_Minv_lowpT","Minv vs pT low",500,0.0,1.0,40,0.,10.);
  29   TH2F * h_Minv_highpT      = new TH2F("h_Minv_highpT","Minv vs pT high",500,0.0,1.0,50,0.,100.);
  30   TH2F * h_Minv_lowpT_back  = new TH2F("h_Minv_lowpT_back","Minv vs pT low back",500,0.0,1.0,40,0.,10.);
  31   TH2F * h_Minv_highpT_back = new TH2F("h_Minv_highpT_back","Minv vs pT high back",500,0.0,1.0,50,0.,100.);
  32
  33
  34   TH1F * h_Pseudoeta = new TH1F("h_Pseudoeta","Pseudoeta photons",500,-1.0,1.0);
  35   TH1F * h_Pt        = new TH1F("h_Pt","Pt photons",400,0.,10.);
  36   TH2F * h_Peta_Pt   = new TH2F("h_Peta_Pt","Pseudo vs pT",40,0.,10.,50,-1.0,1.0);
  37   TH1F * h_Phi       = new TH1F("h_Phi","Phi photons",400,-4.,4.);
  38   TH2F * h_Peta_Phi  = new TH2F("h_Peta_Phi","Pseudo vs Phi",200,-4,4,200,-1.0,1.0);
  39   TH1F * h_Dispersion= new TH1F("h_Dispersion","Dispersion",50,0.,10.);
  40   TH1F * h_Type      = new TH1F("h_Type","Particle Type",10,0.,10.);
  41
  42   TH1F * h_DeltaR   = new TH1F("h_DeltaR","Delta R",400,0.,2.);
  43   TH1F * h_Asymmetry= new TH1F("h_Asymmetry","Asymmetry",400, -2., 2.);
  44
  45   AliPHOSGetter * RecData = AliPHOSGetter::GetInstance(filename,"Gines")  ;
  46
  47   AliPHOSRecParticle * RecParticle1;
  48   AliPHOSRecParticle * RecParticle2;
  49
  50   Float_t RelativeRCut = 0.00001 ;
  51   Float_t AsymmetryCut = 0.7 ;
  52   Float_t Asymmetry;
  53   Float_t Type;
  54
  55   Int_t iEvent, iRecParticle1, iRecParticle2;
  56   Int_t nRecParticle;
  57   Float_t invariant_mass, invariant_mass_mixed;
  58
  59   Float_t average_multiplicity = 0.;
  60
  61   for(iEvent=0; iEvent<gAlice->TreeE()->GetEntries(); iEvent++)
  62     {
  63       TLorentzVector P_photon1, P_photon2, P_photonMixed1, P_photonMixed2 ;
  64
  65       RecData->Event(iEvent);
  66       printf(">>> Event %d \n",iEvent);
  67       nRecParticle=RecData->NRecParticles();
  68       average_multiplicity += ((Float_t) (nRecParticle) ) / ( (Float_t)gAlice->TreeE()->GetEntries() ) ;
  69       // Construction de la masse invariante des pairs
  70       if (nRecParticle > 1)
  71         {
  72           for(iRecParticle1=0; iRecParticle1<nRecParticle; iRecParticle1++)
  73             {
  74               RecParticle1 = (AliPHOSRecParticle *)  RecData->RecParticle(iRecParticle1);
  75               RecParticle1->Momentum(P_photon1);
  76               Type = RecParticle1->GetType();
  77               h_Type->Fill(Type);
  78
  79
  80               h_Pseudoeta->Fill(P_photon1.PseudoRapidity());
  81               h_Pt->Fill(P_photon1.Pt());
  82               h_Phi->Fill(P_photon1.Phi());
  83               h_Peta_Pt->Fill(P_photon1.Pt(), P_photon1.PseudoRapidity());
  84               h_Peta_Phi->Fill(P_photon1.Phi(), P_photon1.PseudoRapidity() );
  85
  86               for(iRecParticle2=iRecParticle1+1; iRecParticle2<nRecParticle; iRecParticle2++)
  87                 {
  88                   RecParticle2 = (AliPHOSRecParticle *)  RecData->RecParticle(iRecParticle2);
  89                   RecParticle2->Momentum(P_photon2);
  90                   Asymmetry = TMath::Abs((P_photon1.E()-P_photon2.E())/(P_photon1.E()+P_photon2.E()));
  91                   if ( (P_photon1 != P_photon2) &&
  92                        (P_photon1.DeltaR(P_photon2) > RelativeRCut) &&
  93                        (Asymmetry < AsymmetryCut)                          )
  94                     {
  95                       h_DeltaR->Fill(P_photon1.DeltaR(P_photon2));
  96                       h_Asymmetry->Fill( Asymmetry );
  97
  98                       //   printf("A. p1 es %f \n",P_photon1->E());
  99                       invariant_mass = (P_photon1 + P_photon2).M();
 100                       // printf("B. p1 es %f \n",P_photon1->E());
 101                       h_Minv_lowpT->Fill(invariant_mass, (P_photon1 + P_photon2).Pt() );
 102                       h_Minv_highpT->Fill(invariant_mass,(P_photon1 + P_photon2).Pt() );
 103                     }
 104                 }
 105             }
 106         }
 107     }
 108   printf(">>> Average Multiplicity is %f \n",average_multiplicity);
 109   Int_t Background = (Int_t)  (gAlice->TreeE()->GetEntries() * average_multiplicity * (average_multiplicity-1.)/2.) ;
 110   printf(">>> Background is %d \n",Background);
 111
 112   Double_t Pt_Mixed1, Pt_Mixed2;
 113   Double_t Y_Mixed1, Y_Mixed2;
 114   Double_t Phi_Mixed1, Phi_Mixed2;
 115
 116   for(iEvent=0; iEvent<Background; iEvent++)
 117     {
 118       TLorentzVector P_photon1, P_photon2, P_photonMixed1, P_photonMixed2 ;
 119       //      printf(">>> Background Event %d \n",iEvent);
 120       Pt_Mixed1 =  h_Pt->GetRandom();
 121       Pt_Mixed2 =  h_Pt->GetRandom();
 122       h_Peta_Phi->GetRandom2(Phi_Mixed1, Y_Mixed1);
 123       h_Peta_Phi->GetRandom2(Phi_Mixed2, Y_Mixed2);
 124       P_photonMixed1.SetPtEtaPhiM( Pt_Mixed1, Y_Mixed1, Phi_Mixed1, 0.0);
 125       P_photonMixed2.SetPtEtaPhiM( Pt_Mixed2, Y_Mixed2, Phi_Mixed2, 0.0);
 126       Asymmetry = TMath::Abs((P_photonMixed1.E()-P_photonMixed2.E())/(P_photonMixed1.E()+P_photonMixed2.E()));
 127
 128       if ( (P_photonMixed1.DeltaR(P_photonMixed2) > RelativeRCut) &&
 129            (Asymmetry < AsymmetryCut  )                               )
 130         {
 131           invariant_mass_mixed = (P_photonMixed1 + P_photonMixed2).M();
 132           h_Minv_lowpT_back->Fill(invariant_mass_mixed, (P_photonMixed1 + P_photonMixed2).Pt() );
 133           h_Minv_highpT_back->Fill(invariant_mass_mixed,(P_photonMixed1 + P_photonMixed2).Pt() );
 134         }
 135     }
 136
 137
 138   char outputname[80];
 139   sprintf(outputname,"%s.Minv",filename);
 140   TFile output(outputname,"recreate");
 141   h_Minv_lowpT->Write();
 142   h_Minv_highpT->Write();
 143   h_Minv_lowpT_back->Write();
 144   h_Minv_highpT_back->Write();
 145   h_Pseudoeta->Write();
 146   h_Pt->Write();
 147   h_Peta_Pt->Write();
 148   h_Phi->Write();
 149   h_Peta_Phi->Write();
 150   h_Dispersion->Write();
 151   h_Type->Write();
 152   h_Asymmetry->Write();
 153   h_DeltaR->Write();
 154
 155   output.Close();
 156 }
 157
 158
 159 void AnaPtSpectrum(char * filename, Int_t NumberPerPtBin, Option_t * particle, Option_t * opt)
 160 {
 161
 162   Int_t NumberOfPtBins = NumberPerPtBin;
 163   Float_t PtCalibration = 0.250;
 164
 165   TFile * in = new TFile(filename);
 166
 167   TH2F * h_Minv_pT = 0;
 168   TH2F * h_Minv_pT_back = 0;
 169   TH2F * frame = 0 ;
 170
 171   if (strstr(opt,"low"))
 172     {
 173       h_Minv_pT      = (TH2F *) in->Get("h_Minv_lowpT"); ;
 174       h_Minv_pT_back = (TH2F *) in->Get("h_Minv_lowpT_back");
 175       PtCalibration  = 0.250;
 176       frame = new TH2F("PtSpectrumlow","Pt Spectrum low",10, 0.,10.,10,0.1,10000);
 177     }
 178   if (strstr(opt,"high"))
 179     {
 180       h_Minv_pT      = (TH2F *) in->Get("h_Minv_highpT"); ;
 181       h_Minv_pT_back = (TH2F *) in->Get("h_Minv_highpT_back");
 182       PtCalibration = 2.5;
 183       frame = new TH2F("PtSpectrumhigh","Pt Spectrum high",10, 0.,100.,10,0.1,10000);
 184     }
 185
 186   if ( h_Minv_pT == 0 )
 187     {
 188       printf(">>> Bad Option! \n");
 189       return;
 190     }
 191   Int_t Norma_1 = 100; Float_t Norma_minv_1 = 0.2;
 192   Int_t Norma_2 = 200; Float_t Norma_minv_2 = 0.4;
 193
 194   Int_t Minv_1 = 46;
 195   Int_t Minv_2 = 76;
 196   if (strstr(particle,"eta"))
 197     {
 198       Minv_1 = 214;
 199       Minv_2 = 314;
 200     }
 201
 202   if (strstr(particle,"norma"))
 203     {
 204       Minv_1 = 100;
 205       Minv_2 = 200;
 206     }
 207
 208   Int_t NHistos = 40/NumberOfPtBins;
 209   Int_t iHistos;
 210
 211   TH1D * signal = 0;
 212   TH1D * background = 0;
 213   TH1D * ratio = 0;
 214   TH1D * difference = 0;
 215
 216   Float_t Pt[NHistos];
 217   Float_t PtError[NHistos];
 218   Float_t Nmesons[NHistos];
 219   Float_t NmesonsError[NHistos];
 220
 221   Float_t Ntota, Nback, Norma, NormaError, Renorma;
 222
 223   for(iHistos=0; iHistos<NHistos; iHistos++)
 224     {
 225       signal     = h_Minv_pT->ProjectionX("signal",         NumberOfPtBins*iHistos+1,NumberOfPtBins*(iHistos+1));
 226       background = h_Minv_pT_back->ProjectionX("background",NumberOfPtBins*iHistos+1,NumberOfPtBins*(iHistos+1));
 227
 228       ratio = new TH1D(*signal);
 229       ratio->Sumw2();
 230       ratio->Add(background,-1.0);
 231       ratio->Divide(background);
 232       difference = new TH1D(*signal);
 233       difference->Sumw2();
 234       ratio->Fit("pol0","","",Norma_minv_1,Norma_minv_2);
 235       if (background->Integral(Norma_1,Norma_2) == 0)
 236         Renorma = 0.;
 237       else
 238         Renorma = signal->Integral(Norma_1,Norma_2)/background->Integral(Norma_1,Norma_2);
 239       difference->Add(background,(-1.)*Renorma);
 240
 241
 242       Ntota = signal->Integral(Minv_1,Minv_2);
 243       Nback = background->Integral(Minv_1,Minv_2);
 244       Norma = ratio->GetFunction("pol0")->GetParameter(0);
 245       if (Renorma == 0.)
 246         NormaError = 0.;
 247       else
 248         NormaError =  ratio->GetFunction("pol0")->GetParError(0);
 249       printf("Ntotal %f Nback %f Norma %f and NormaError %f \n",Ntota, Nback, Norma, NormaError);
 250       printf("differencia is %f \n",difference->Integral(Minv_1,Minv_2));
 251       Nmesons[iHistos] = Ntota - Renorma * Nback;
 252       NmesonsError[iHistos] = TMath::Sqrt( Ntota + Nback*Renorma*Renorma + Nback*Nback*NormaError*NormaError );
 253       Pt[iHistos] = (iHistos+0.5)*NumberOfPtBins*PtCalibration;
 254       PtError[iHistos] = NumberOfPtBins*PtCalibration/2.;
 255
 256     }
 257
 258   char filenameout[80];
 259   sprintf(filenameout,"%s.PtSpectrum_%d_%s_%s",filename, NumberPerPtBin, particle, opt);
 260   TFile out(filenameout,"recreate");
 261   TGraphErrors * PtSpectrum = new TGraphErrors(NHistos, Pt, Nmesons, PtError, NmesonsError);
 262   PtSpectrum->SetName("PtSpectrum");
 263   PtSpectrum->Write();
 264   out.Close();
 265
 266   frame->Draw();
 267   frame->SetStats(0);
 268   frame->SetXTitle("Neutral meson pT (GeV/c)");
 269   frame->SetYTitle("Number of neutral mesons per pT bin");
 270   PtSpectrum->SetMarkerStyle(27);
 271   PtSpectrum->Draw("P");
 272
 273
 274 }