RecoDiMuon.cc

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//-ap #include "Configuration/CSA06Skimming/interface/RecoDiMuon.h"
#include "GeneratorInterface/GenFilters/interface/RecoDiMuon.h"

#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "DataFormats/TrackReco/interface/Track.h"

#include <iostream>

#include "FWCore/MessageLogger/interface/MessageLogger.h"

using namespace edm;
using namespace std;


RecoDiMuon::RecoDiMuon(const edm::ParameterSet& iConfig) :
  nEvents_(0), nAccepted_(0)
{
  muonLabel_ = iConfig.getParameter<InputTag>("MuonLabel");
  singleMuonPtMin_ = iConfig.getUntrackedParameter<double>("SingleMuonPtMin",20.);
  diMuonPtMin_ = iConfig.getUntrackedParameter<double>("DiMuonPtMin",5.);
}


RecoDiMuon::~RecoDiMuon()
{
}

void RecoDiMuon::endJob() 
{
  edm::LogVerbatim("RecoDiMuon") 
        << "Events read " << nEvents_ 
            << " Events accepted " << nAccepted_ 
            << "\nEfficiency " << ((double)nAccepted_)/((double)nEvents_) 
        << std::endl;
}

// ------------ method called to skim the data  ------------
bool RecoDiMuon::filter(edm::Event& iEvent, const edm::EventSetup& iSetup)
{

  nEvents_++;
  bool accepted = false;
  using namespace edm;

  Handle<reco::TrackCollection> muons;

  iEvent.getByLabel(muonLabel_, muons);
  if (!muons.isValid()) {
    edm::LogError("RecoDiMuon") << "FAILED to get Muon Track Collection. ";
    return false;
  }

  if ( muons->empty() ) {
    return false;
  }

  // at least one muons above a pt threshold singleMuonPtMin 
  // or at least 2 muons above a pt threshold diMuonPtMin
  int nMuonOver2ndCut = 0;
  for(reco::TrackCollection::const_iterator muon = muons->begin(); muon != muons->end(); ++ muon ) {

    if ( muon->pt() > singleMuonPtMin_ ) accepted = true;
    if ( muon->pt() > diMuonPtMin_ )  nMuonOver2ndCut++;
  }
  if ( nMuonOver2ndCut >= 2 ) accepted = true;

  if ( accepted ) nAccepted_++;

  return accepted;

}