Example for reading primaries/

diff --git a/FASTSIM/readPrimaries.C b/FASTSIM/readPrimaries.C
new file mode 100644 (file)
index 0000000..a5641fb
--- /dev/null
+++ b/FASTSIM/readPrimaries.C
@@ -0,0 +1,111 @@
+void TestPrimaries(Int_t evNumber1=0, Int_t evNumber2=0) 
+{
+// Dynamically link some shared libs                    
+    if (gClassTable->GetID("AliRun") < 0) {
+       gROOT->LoadMacro("loadlibs.C");
+       loadlibs();
+    }
+// Connect the Root Galice file containing Geometry, Kine and Hits
+
+    AliRunLoader* rl = AliRunLoader::Open("galice.root");
+//
+    TDatabasePDG*  DataBase = new TDatabasePDG();
+    
+//  Create some histograms
+
+    TH1F *thetaH   =  new TH1F("thetaH","Theta distribution",180,0,180);
+    TH1F *phiH     =  new TH1F("phiH","Phi distribution"  ,180,-180,180);
+    TH1F *etaH     =  new TH1F("etaH","Pseudorapidity",120,-12,12);
+    TH1F *yH       =  new TH1F("yH","Rapidity distribution",120,-12,12);
+    TH1F *eH       =  new TH1F("eH","Energy distribution",100,0,100);
+    TH1F *eetaH    =  new TH1F("eetaH","Pseudorapidity",120,0,12);
+    TH1F *ptH      =  new TH1F("ptH","Pt distribution",150,0,15);
+//
+//   Loop over events 
+//
+    
+    for (Int_t nev=0; nev<= evNumber2; nev++) {
+       rl->GetEvent(nev);
+       rl->LoadKinematics();
+       rl->LoadHeader();
+       AliStack* stack = rl->Stack();
+       Int_t npart = stack->GetNprimary();
+       if (nev < evNumber1) continue;
+//
+// Loop over primary particles (jpsi. upsilon, ...)
+//       
+       
+       for (Int_t part=0; part<npart; part++) {
+           TParticle *MPart = stack->Particle(part);
+           Int_t mpart  = MPart->GetPdgCode();
+           Int_t child1 = MPart->GetFirstDaughter();
+           Int_t child2 = MPart->GetLastDaughter();    
+           Int_t mother = MPart->GetFirstMother();        
+           printf("\n  %d %d %d %d ", mpart, child1, child2, mother);
+           
+           Float_t Pt = MPart->Pt();
+           Float_t E  = MPart->Energy();
+           Float_t Pz = MPart->Pz();
+           Float_t Py = MPart->Py();
+           Float_t Px = MPart->Px();
+           Float_t pT = TMath::Sqrt(Px*Px+Py*Py);
+           Float_t theta = MPart->Theta();
+           Float_t phi   = MPart->Phi()-TMath::Pi();
+           Float_t eta   = -TMath::Log(TMath::Tan(theta/2.));
+           Float_t y     = 0.5*TMath::Log((E+Pz+1.e-13)/(E-Pz+1.e-13));
+           
+           if (child1 >= 0) continue;
+           if (mpart == kPi0 || mpart == kGamma) continue;
+           Float_t wgt = 1./(Float_t ((evNumber2-evNumber1)+1.));
+           thetaH->Fill(theta*180./TMath::Pi(),wgt);
+           phiH->Fill(phi*180./TMath::Pi(),wgt);
+           etaH->Fill(eta,5.*wgt);    
+           eetaH->Fill(eta,E);    
+           yH->Fill(y,5.*wgt);      
+           eH->Fill(E,wgt);      
+           ptH->Fill(pT,wgt);     
+       } // primary loop
+    }
+    
+//Create a canvas, set the view range, show histograms
+    TCanvas *c1 = new TCanvas("c1","Canvas 1",400,10,600,700);
+    c1->Divide(2,2);
+    c1->cd(1); ptH->Draw();
+    c1->cd(2); etaH->Draw();
+    c1->cd(3); yH->Draw();
+    c1->cd(4
+
+
+
+); eH->Draw();
+
+    TCanvas *c2 = new TCanvas("c2","Canvas 1",400,10,600,700);
+    c2->Divide(2,2);
+    c2->cd(1); phiH->Draw();
+    c2->cd(2); thetaH->Draw();
+    c2->cd(3); eetaH->Draw();
+    Float_t i0,i1,i2,i3,i4,i5;
+    Float_t ne = Float_t ((evNumber2-evNumber1)+1.);
+    
+    i0=eetaH->Integral(01,25)/1000./ne;
+    i1=eetaH->Integral(25,40)/1000./ne;
+    i2=eetaH->Integral(40,50)/1000./ne;
+    i3=eetaH->Integral(50,60)/1000./ne;
+    i4=eetaH->Integral(60,70)/1000./ne;
+    i5=eetaH->Integral(70,120)/1000./ne;
+
+    printf("  0 < eta < 2.5 %f \n",i0);
+    printf("2.5 < eta < 4.0 %f \n",i1);
+    printf("4.0 < eta < 5.0 %f \n",i2);
+    printf("5.0 < eta < 6.0 %f \n",i3);
+    printf("6.0 < eta < 7.0 %f \n",i4);
+    printf("7.0 < eta <12.0 %f \n",i5);
+
+}
+
+
+
+
+
+
+