Example for pA and slow nucleon simulation.

diff --git a/FASTSIM/fastGenPA.C b/FASTSIM/fastGenPA.C
new file mode 100644 (file)
index 0000000..498507c
--- /dev/null
+++ b/FASTSIM/fastGenPA.C
@@ -0,0 +1,129 @@
+AliGenerator*  CreateGenerator();
+
+void fastGenPA(Int_t nev = 1, char* filename = "galice.root")
+{
+//
+//                        Construction
+//
+//  Output file
+    TFile*  file         = new TFile(filename, "recreate");
+//  Create stack
+    AliStack* stack      = new AliStack(10000);
+    stack->MakeTree(0, filename);
+
+//  Create Header
+    AliHeader* header    = new AliHeader();
+//  Create Header Tree
+    TTree* treeE         = new TTree("TE","Headers");
+    treeE->Branch("Header", "AliHeader", &header, 4000, 0);
+    treeE->Write();
+//
+//  Create and Initialize Generator
+    AliGenerator *gener = CreateGenerator();
+    AliPythia* pyth = AliPythia::Instance();
+    
+    gener->Init();
+    gener->SetStack(stack);
+    
+//
+//                        Event Loop
+//
+    Int_t iev;
+     
+    for (iev = 0; iev < nev; iev++) {
+
+       printf("\n \n Event number %d \n \n", iev);
+       
+//  Initialize event
+       header->Reset(0,iev);
+       stack->Reset();
+       stack->BeginEvent(iev);
+
+//  Generate event
+       gener->Generate();
+               
+//  Analysis
+       Int_t npart = stack->GetNprimary();
+//     printf("Analyse %d Particles\n", npart);
+       for (Int_t part=0; part<npart; part++) {
+           TParticle *MPart = stack->Particle(part);
+           Int_t mpart  = MPart->GetPdgCode();
+           printf("Particle %d\n", mpart);
+       }
+       
+//  Finish event
+       header->SetNprimary(stack->GetNprimary());
+       header->SetNtrack(stack->GetNtrack());  
+//      I/O
+//     
+//     stack->FinishEvent();
+//     header->SetStack(stack);
+//     treeE->Fill();
+//     (stack->TreeK())->Write(0,TObject::kOverwrite);
+    } // event loop
+//
+//                         Termination
+//  Generator
+    printf("Calling Finish Run \n");
+    
+    gener->FinishRun();
+//  Header
+    treeE->Write(0,TObject::kOverwrite);
+    delete treeE;   treeE = 0;
+//  Stack
+    stack->FinishRun();
+//  Write file
+    gener->Write();
+    file->Write();
+}
+
+
+AliGenerator*  CreateGenerator()
+{
+    AliGenCocktail *gener  = new AliGenCocktail();
+    gener->SetTrackingFlag(0);
+    AliGenHijing   *hijing = new AliGenHijing(-1);
+// centre of mass energy 
+    hijing->SetEnergyCMS(TMath::Sqrt(82./208.) * 14000.);
+// impact parameter range
+    hijing->SetImpactParameterRange(0., 6.);
+// reference frame
+    hijing->SetReferenceFrame("CMS");
+    hijing->SetBoostLHC(1);
+// projectile
+    hijing->SetProjectile("P", 1, 1);
+    hijing->SetTarget    ("A", 208, 82);
+// tell hijing to keep the full parent child chain
+    hijing->KeepFullEvent();
+// enable jet quenching
+    hijing->SetJetQuenching(4);
+// enable shadowing
+    hijing->SetShadowing(1);
+// Don't track spectators
+    hijing->SetSpectators(0);
+// kinematic selection
+    hijing->SetSelectAll(0);
+//
+    AliGenSlowNucleons*  gray    = new AliGenSlowNucleons(1);
+    AliSlowNucleonModel* model   = new AliSlowNucleonModelExp();
+    gray->SetSlowNucleonModel(model);
+    gray->SetDebug(1);
+    
+    
+    gener->AddGenerator(hijing,"Hijing pPb", 1);
+    gener->AddGenerator(gray,  "Gray Particles",1);
+    
+    return gener;
+}
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