PYTHIA8/pythia8.C

   1 AliGenerator*  CreateGenerator();
   2
   3 void pythia8(Int_t nev = 1, char* filename = "galice.root")
   4 {
   5 //  Runloader
   6     gSystem->Load("liblhapdf.so");
   7     gSystem->Load("libEGPythia6.so");
   8     gSystem->Load("libpythia6.so");
   9     gSystem->Load("libAliPythia6.so");
  10     gSystem->Load("libpythia8.so");
  11     gSystem->Load("libAliPythia8.so");
  12
  13     AliRunLoader* rl = AliRunLoader::Open("galice.root","FASTRUN","recreate");
  14
  15     rl->SetCompressionLevel(2);
  16     rl->SetNumberOfEventsPerFile(10000);
  17     rl->LoadKinematics("RECREATE");
  18     rl->MakeTree("E");
  19     gAlice->SetRunLoader(rl);
  20
  21 //  Create stack
  22     rl->MakeStack();
  23     AliStack* stack      = rl->Stack();
  24
  25 //  Header
  26     AliHeader* header = rl->GetHeader();
  27 //
  28 //  Create and Initialize Generator
  29     AliGenerator *gener = CreateGenerator();
  30     gener->Init();
  31     gener->SetStack(stack);
  32
  33 //
  34 //                        Event Loop
  35 //
  36     Int_t iev;
  37
  38     for (iev = 0; iev < nev; iev++) {
  39
  40         printf("\n \n Event number %d \n \n", iev);
  41
  42 //  Initialize event
  43         header->Reset(0,iev);
  44         rl->SetEventNumber(iev);
  45         stack->Reset();
  46         rl->MakeTree("K");
  47 //      stack->ConnectTree();
  48
  49 //  Generate event
  50         gener->Generate();
  51 //  Analysis
  52         Int_t npart = stack->GetNprimary();
  53         printf("Analyse %d Particles\n", npart);
  54         for (Int_t part=0; part<npart; part++) {
  55             TParticle *MPart = stack->Particle(part);
  56             Int_t mpart  = MPart->GetPdgCode();
  57 //          printf("Particle %d\n", mpart);
  58         }
  59
  60 //  Finish event
  61         header->SetNprimary(stack->GetNprimary());
  62         header->SetNtrack(stack->GetNtrack());
  63 //      I/O
  64 //
  65         stack->FinishEvent();
  66         header->SetStack(stack);
  67         rl->TreeE()->Fill();
  68         rl->WriteKinematics("OVERWRITE");
  69
  70     } // event loop
  71 //
  72 //                         Termination
  73 //  Generator
  74     gener->FinishRun();
  75 //  Write file
  76     rl->WriteHeader("OVERWRITE");
  77     gener->Write();
  78     rl->Write();
  79
  80 }
  81
  82
  83 AliGenerator*  CreateGenerator()
  84 {
  85     AliGenPythiaPlus* gener = new AliGenPythiaPlus(AliPythia8::Instance());
  86 //
  87 //
  88     gener->SetProcess(kPyMbDefault);
  89 //   Centre of mass energy
  90     gener->SetEnergyCMS(7000.);
  91 //   Initialize generator
  92     gener->SetEventListRange(-1, 10);
  93     return gener;
  94 }
  95
  96
  97
  98
  99
 100
 101
 102