Exemple #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();
}
int HFMLTriggerHepMCTrigger::process_event(PHCompositeNode* topNode)
{
  assert(m_Geneventmap);

  PHHepMCGenEvent* genevt = m_Geneventmap->get(_embedding_id);
  if (!genevt)
  {
    std::cout << PHWHERE << " - Fatal error - node PHHepMCGenEventMap missing subevent with embedding ID " << _embedding_id;
    std::cout << ". Print PHHepMCGenEventMap:";
    m_Geneventmap->identify();
    return Fun4AllReturnCodes::ABORTRUN;
  }

  HepMC::GenEvent* theEvent = genevt->getEvent();
  assert(theEvent);
  if (Verbosity() >= VERBOSITY_MORE)
  {
    cout << "HFMLTriggerHepMCTrigger::process_event - process HepMC::GenEvent with signal_process_id = "
         << theEvent->signal_process_id();
    if (theEvent->signal_process_vertex())
    {
      cout << " and signal_process_vertex : ";
      theEvent->signal_process_vertex()->print();
    }
    cout << "  - Event record:" << endl;
    theEvent->print();
  }

  TDatabasePDG* pdg = TDatabasePDG::Instance();

  int targetPID = std::abs(pdg->GetParticle("D0")->PdgCode());
  int daughter1PID = std::abs(pdg->GetParticle("pi+")->PdgCode());
  int daughter2PID = std::abs(pdg->GetParticle("K+")->PdgCode());

  bool acceptEvent = false;

  assert(m_hNorm);
  m_hNorm->Fill("Event", 1);

  unsigned int nD0(0);
  unsigned int nD0PiK(0);

  auto range = theEvent->particle_range();
  for (HepMC::GenEvent::particle_const_iterator piter = range.begin(); piter != range.end(); ++piter)
  {
    const HepMC::GenParticle* p = *piter;
    assert(p);

    if (std::abs(p->pdg_id()) == targetPID)
    {
      if (Verbosity())
      {
        cout << "HFMLTriggerHepMCTrigger::process_event - Accept signal particle : ";
        p->print();
        cout << endl;
      }

      m_hNorm->Fill("D0", 1);
      ++nD0;

      assert(m_DRapidity);
      const double rapidity = 0.5 * log((p->momentum().e() + p->momentum().z()) /
                                        (p->momentum().e() - p->momentum().z()));

      m_DRapidity->Fill(rapidity, 0);

      const HepMC::GenVertex* decayVertex = p->end_vertex();

      int hasDecay1(0);
      int hasDecay2(0);
      int hasDecayOther(0);

      if (decayVertex)
      {
        for (auto diter = decayVertex->particles_out_const_begin();
             diter != decayVertex->particles_out_const_end();
             ++diter)

        {
          const HepMC::GenParticle* pd = *diter;
          assert(pd);

          if (Verbosity())
          {
            cout << "HFMLTriggerHepMCTrigger::process_event - Testing daughter particle: ";
            pd->print();
            cout << endl;
          }

          if (std::abs(pd->pdg_id()) == daughter1PID)
          {
            const double eta = pd->momentum().eta();

            if (eta > _eta_min and eta < _eta_max)
              ++hasDecay1;
          }
          else if (std::abs(pd->pdg_id()) == daughter2PID)
          {
            const double eta = pd->momentum().eta();

            if (eta > _eta_min and eta < _eta_max)
              ++hasDecay2;
          }
          else
            ++hasDecayOther;
        }

        if (hasDecay1 == 1 and hasDecay2 == 1 and hasDecayOther == 0)
        {
          m_hNorm->Fill("D0->PiK", 1);
          ++nD0PiK;

          acceptEvent = true;

          m_DRapidity->Fill(rapidity, 1);
        }

      }  //      if (decayVertex)
      else
      {
        cout << "HFMLTriggerHepMCTrigger::process_event - Warning - target particle did not have decay vertex : ";
        p->print();
        cout << endl;
      }

    }  //    if (std::abs(p-> pdg_id()) == targetPID)
  }    //  for (HepMC::GenEvent::particle_const_iterator piter = range.begin(); piter != range.end(); ++piter)

  if (nD0 >= 2)
  {
    cout <<"HFMLTriggerHepMCTrigger::process_event - D0-Pair with nD0 = "<<nD0<<endl;
    m_hNorm->Fill("D0-Pair", nD0 * (nD0 - 1) / 2);
  }
  if (nD0PiK >= 2)
  {
    m_hNorm->Fill("D0->PiK-Pair", nD0PiK * (nD0PiK - 1) / 2);
  }

  ++_ievent;

  if (Verbosity())
  {
    cout << "HFMLTriggerHepMCTrigger::process_event - acceptEvent = " << acceptEvent;
    cout << endl;

    if (acceptEvent)
    {
      cout << "HFMLTriggerHepMCTrigger::process_event - processed HepMC::GenEvent with signal_process_id = "
           << theEvent->signal_process_id();
      if (theEvent->signal_process_vertex())
      {
        cout << " and signal_process_vertex : ";
        theEvent->signal_process_vertex()->print();
      }
      cout << "  - Event record:" << endl;
      theEvent->print();
    }
  }

  assert(m_Flags);
  m_Flags->set_int_param(Name(), acceptEvent);

  if (acceptEvent)
  {
    m_hNorm->Fill("Accepted", 1);
    return Fun4AllReturnCodes::EVENT_OK;
  }
  else
    return m_RejectReturnCode;
}