/data/refman/pasoursint/CMSSW_5_3_3/src/GeneratorInterface/HiGenCommon/src/PartonHadronDecayGenEvtSelector.cc

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#include <iostream>
#include "GeneratorInterface/HiGenCommon/interface/PartonHadronDecayGenEvtSelector.h"
#include "FWCore/Utilities/interface/EDMException.h"
using namespace std;

PartonHadronDecayGenEvtSelector::PartonHadronDecayGenEvtSelector(const edm::ParameterSet& pset) : BaseHiGenEvtSelector(pset)
{

  hadronId_       = pset.getParameter<vector<int> >("hadrons");
  hadronStatus_   = pset.getParameter<vector<int> >("hadronStatus");
  hadronEtaMax_   = pset.getParameter<vector<double> >("hadronEtaMax");
  hadronEtaMin_   = pset.getParameter<vector<double> >("hadronEtaMin");
  hadronPMin_     = pset.getParameter<vector<double> >("hadronPMin");
  hadronPtMax_    = pset.getParameter<vector<double> >("hadronPtMax");
  hadronPtMin_    = pset.getParameter<vector<double> >("hadronPtMin");
  
  decayId_        = pset.getParameter<int>("decays");
  decayStatus_    = pset.getParameter<int>("decayStatus");
  decayEtaMax_    = pset.getParameter<double>("decayEtaMax");
  decayEtaMin_    = pset.getParameter<double>("decayEtaMin");
  decayPMin_      = pset.getParameter<double>("decayPMin");
  decayPtMax_     = pset.getParameter<double>("decayPtMax");
  decayPtMin_     = pset.getParameter<double>("decayPtMin");
  decayNtrig_     = pset.getParameter<int>("decayNtrig");

  partonId_       = pset.getParameter<vector<int> >("partons");
  partonStatus_   = pset.getParameter<vector<int> >("partonStatus");
  partonEtaMax_   = pset.getParameter<vector<double> >("partonEtaMax");
  partonPtMin_    = pset.getParameter<vector<double> >("partonPtMin");
     
  int id     = hadronId_.size();
  int st     = hadronStatus_.size();
  int etamax = hadronEtaMax_.size();
  int etamin = hadronEtaMin_.size();
  int pmin   = hadronPMin_.size();
  int ptmax  = hadronPtMax_.size();
  int ptmin  = hadronPtMin_.size();
  
  if( id!=st || id!=etamax || id!=etamin || id!=ptmax || id!=ptmin || id!=pmin)
    {
      throw edm::Exception(edm::errors::LogicError)<<"Hadron selection parameters: "<<id<<st<<etamax<<etamin<<pmin<<ptmax<<ptmin<<endl;
    }
  

  id     = partonId_.size();
  st     = partonStatus_.size();
  etamax = partonEtaMax_.size();
  ptmin  = partonPtMin_.size();
  
  if( id!=st || id!=etamax || id!=ptmin )
    {
      throw edm::Exception(edm::errors::LogicError)<<"Parton selection parameters: "<<id<<st<<etamax<<ptmin<<endl;
    }
  
}


//____________________________________________________________________________________________
bool PartonHadronDecayGenEvtSelector::filter(HepMC::GenEvent *evt)
{
  // loop over HepMC event, and search for  products of interest

  HepMC::GenEvent::particle_const_iterator begin = evt->particles_begin();
  HepMC::GenEvent::particle_const_iterator end   = evt->particles_end();
  
  bool foundHadron   = false;
  bool foundDecay    = false;
  bool foundParton   = false;
  
  HepMC::GenEvent::particle_const_iterator it = begin;
  while( !foundParton && it != end )
    {
      for(unsigned i = 0; i < partonId_.size(); ++i)
        {
          if( selectParticle(*it,
                             partonStatus_[i], partonId_[i],  
                             partonPtMin_[i],partonEtaMax_[i]) ) foundParton = true;
        }
      ++it;
    }

  int foundtrig = 0;
  HepMC::GenEvent::particle_const_iterator it2 = begin;
 
  if(foundParton)
    {
      while( (!foundHadron || !foundDecay) && it2 != end )
        {
          
          for(unsigned i = 0; i < hadronId_.size(); ++i)
            {
              if( selectParticle(*it2, 
                                 hadronStatus_[i], hadronId_[i], 
                                 hadronEtaMax_[i],hadronEtaMin_[i], 
                                 hadronPMin_[i],
                                 hadronPtMax_[i],hadronPtMin_[i]) ) foundHadron = true;
            }
        
          if( selectParticle(*it2, 
                             decayStatus_, decayId_, 
                             decayEtaMax_,decayEtaMin_, 
                             decayPMin_,
                             decayPtMax_,decayPtMin_) ) foundtrig++;
          if(decayNtrig_ == foundtrig) foundDecay = true;
           
          ++it2;
        }
    }
  
  return (foundHadron && foundDecay && foundParton);
}


//____________________________________________________________________________________________