EVGEN/TestPrimaries.C

   1 void TestPrimaries(Int_t evNumber1=0, Int_t evNumber2=0)
   2 {
   3 // Dynamically link some shared libs
   4     if (gClassTable->GetID("AliRun") < 0) {
   5         gROOT->LoadMacro("loadlibs.C");
   6         loadlibs();
   7     }
   8 // Connect the Root Galice file containing Geometry, Kine and Hits
   9     AliRunLoader* rl = AliRunLoader::Open("galice.root");
  10 //
  11     TDatabasePDG*  DataBase = TDatabasePDG::Instance();
  12
  13 //  Create some histograms
  14
  15     TH1F *thetaH   =  new TH1F("thetaH","Theta distribution",180,0,180);
  16     TH1F *phiH     =  new TH1F("phiH","Phi distribution"  ,180,-180,180);
  17     TH1F *etaH     =  new TH1F("etaH","Pseudorapidity",120,-12,12);
  18     TH1F *yH       =  new TH1F("yH","Rapidity distribution",120,-12,12);
  19     TH1F *eH       =  new TH1F("eH","Energy distribution",100,0,100);
  20     TH1F *eetaH    =  new TH1F("eetaH","Pseudorapidity",120,0,12);
  21     TH1F *ptH      =  new TH1F("ptH","Pt distribution",150,0,15);
  22 //
  23 //   Loop over events
  24 //
  25     rl->LoadKinematics();
  26     rl->LoadHeader();
  27
  28     for (Int_t nev=0; nev<= evNumber2; nev++) {
  29         rl->GetEvent(nev);
  30         AliStack* stack = rl->Stack();
  31         Int_t npart = stack->GetNprimary();
  32         if (nev < evNumber1) continue;
  33 //
  34 // Loop over primary particles (jpsi. upsilon, ...)
  35 //
  36
  37         for (Int_t part=0; part<npart; part++) {
  38             TParticle *MPart = stack->Particle(part);
  39             Int_t mpart  = MPart->GetPdgCode();
  40             Int_t child1 = MPart->GetFirstDaughter();
  41             Int_t child2 = MPart->GetLastDaughter();
  42             Int_t mother = MPart->GetFirstMother();
  43             Float_t Pt = MPart->Pt();
  44             Float_t E  = MPart->Energy();
  45             Float_t Pz = MPart->Pz();
  46             Float_t Py = MPart->Py();
  47             Float_t Px = MPart->Px();
  48             Float_t pT = TMath::Sqrt(Px*Px+Py*Py);
  49             Float_t theta = MPart->Theta();
  50             Float_t phi   = MPart->Phi()-TMath::Pi();
  51             Float_t eta   = -TMath::Log(TMath::Tan(theta/2.));
  52             Float_t y     = 0.5*TMath::Log((E+Pz+1.e-13)/(E-Pz+1.e-13));
  53
  54             if (child1 >= 0) continue;
  55             if (DataBase->GetParticle(mpart)->Charge() == 0) continue;
  56             Float_t wgt = 1./(Float_t ((evNumber2-evNumber1)+1.));
  57             thetaH->Fill(theta*180./TMath::Pi(),wgt);
  58             phiH->Fill(phi*180./TMath::Pi(),wgt);
  59             etaH->Fill(eta,5.*wgt);
  60             eetaH->Fill(eta,E);
  61             yH->Fill(y,5.*wgt);
  62             eH->Fill(E,wgt);
  63             ptH->Fill(pT,wgt);
  64         } // primary loop
  65     }
  66
  67 //Create a canvas, set the view range, show histograms
  68     TCanvas *c1 = new TCanvas("c1","Canvas 1",400,10,600,700);
  69     c1->Divide(2,2);
  70     c1->cd(1); ptH->Draw();
  71     c1->cd(2); etaH->Draw();
  72     c1->cd(3); yH->Draw();
  73     c1->cd(4); eH->Draw();
  74
  75     TCanvas *c2 = new TCanvas("c2","Canvas 1",400,10,600,700);
  76     c2->Divide(2,2);
  77     c2->cd(1); phiH->Draw();
  78     c2->cd(2); thetaH->Draw();
  79     c2->cd(3); eetaH->Draw();
  80
  81     TFile* f = new TFile("kineH.root", "update");
  82     ptH->Write();
  83     etaH->Write();
  84     yH->Write();
  85     phiH->Write();
  86     f->Close();
  87
  88
  89 }
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