示例#1
0
void Output_Delphes::AnalyseEvent
(ExRootTreeBranch *branch,const HepMC::GenEvent& evt,
 const Long64_t eventNumber,const double weight)
{
  TRootLHEFEvent *element;
  element = static_cast<TRootLHEFEvent*>(branch->NewEntry());
  element->Number = eventNumber;
  element->Nparticles = evt.particles_size();
  element->ProcessID = evt.signal_process_id();
  element->Weight = weight;
  element->ScalePDF = evt.event_scale();
  element->CouplingQED = evt.alphaQED();
  element->CouplingQCD = evt.alphaQCD();
}
示例#2
0
void Output_Delphes::AnalyseParticles(ExRootTreeBranch *branch, const HepMC::GenEvent& evt)
{
  TRootC::GenParticle *element;
  TLorentzVector momentum;
  Double_t signPz;
  ReadStats();
  for(int n=1; n<=evt.particles_size(); n++) {
    int mo1, mo2, da1, da2, status, pid;
    getStatsFromTuple(mo1,mo2,da1,da2,status,pid,n);
    element = static_cast<TRootC::GenParticle*>(branch->NewEntry());
    element->PID = pid;
    element->Status = status;
    element->M1 = mo1 - 1; // added -1 as the numbering in the tree starts from 0
    element->M2 = mo2 - 1;
    element->D1 = da1 - 1;
    element->D2 = da2 - 1;
    element->E = index_to_particle[n]->momentum().e();
    element->Px = index_to_particle[n]->momentum().px();
    element->Py = index_to_particle[n]->momentum().py();
    element->Pz = index_to_particle[n]->momentum().pz();
    element->PT = sqrt(pow(element->Px,2)+pow(element->Py,2));
    momentum.SetPxPyPzE(element->Px, element->Py, element->Pz, element->E);
    signPz = (element->Pz >= 0.0) ? 1.0 : -1.0;
    element->Eta = element->PT < 1e-6 ? signPz*999.9 : momentum.Eta();
    element->Phi = index_to_particle[n]->momentum().phi();
    HepMC::GenVertex* vrtI = (index_to_particle[n])->production_vertex();
    HepMC::GenVertex::particles_in_const_iterator partI;
    if(vrtI) {
      element->T = vrtI->position().t();
      element->X = vrtI->position().x();
      element->Y = vrtI->position().y();
      element->Z = vrtI->position().z();
    }
    else {
      element->T = 0.;
      element->X = 0.;
      element->Y = 0.;
      element->Z = 0.;
    }  
  }
}