PhotonIsoProducer.cc

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// system include files
#include <memory>

// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/EDFilter.h"

#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/MakerMacros.h"

#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "DataFormats/EgammaCandidates/interface/GsfElectron.h"
#include "DataFormats/EgammaCandidates/interface/GsfElectronFwd.h"
#include "DataFormats/PatCandidates/interface/Electron.h"
#include "DataFormats/VertexReco/interface/Vertex.h"
#include "DataFormats/VertexReco/interface/VertexFwd.h"
#include "TrackingTools/Records/interface/TransientTrackRecord.h"
#include "DataFormats/ParticleFlowCandidate/interface/PFCandidate.h"
#include "DataFormats/ParticleFlowCandidate/interface/PFCandidateFwd.h"
#include "EgammaAnalysis/ElectronTools/interface/PFIsolationEstimator.h"
//
// class declaration
//

using namespace std;
using namespace reco;
class PhotonIsoProducer : public edm::EDFilter {
      public:
         explicit PhotonIsoProducer(const edm::ParameterSet&);
         ~PhotonIsoProducer();
      private:
        virtual bool filter(edm::Event&, const edm::EventSetup&);
  
// ----------member data ---------------------------
        bool verbose_;
        edm::InputTag vertexTag_;
        edm::InputTag photonTag_;
        edm::InputTag particleFlowTag_;
        std::string nameIsoCh_;
        std::string nameIsoPh_;
        std::string nameIsoNh_;

        PFIsolationEstimator isolator;
};

//
// constants, enums and typedefs
//

//
// static data member definitions
//

//
// constructors and destructor
//
PhotonIsoProducer::PhotonIsoProducer(const edm::ParameterSet& iConfig) {
        verbose_ = iConfig.getUntrackedParameter<bool>("verbose", false);
        vertexTag_ = iConfig.getParameter<edm::InputTag>("vertexTag");
        photonTag_ = iConfig.getParameter<edm::InputTag>("photonTag");
        particleFlowTag_ = iConfig.getParameter<edm::InputTag>("particleFlowTag");
  
        nameIsoCh_ = iConfig.getParameter<std::string>("nameValueMapIsoCh");
        nameIsoPh_ = iConfig.getParameter<std::string>("nameValueMapIsoPh");
        nameIsoNh_ = iConfig.getParameter<std::string>("nameValueMapIsoNh");
  
  
        produces<edm::ValueMap<double> >(nameIsoCh_);
        produces<edm::ValueMap<double> >(nameIsoPh_);
        produces<edm::ValueMap<double> >(nameIsoNh_);
  
        isolator.initializePhotonIsolation(kTRUE); //NOTE: this automatically set all the correct defaul veto values
        isolator.setConeSize(0.3); 
  
}


PhotonIsoProducer::~PhotonIsoProducer()
{
  
  // do anything here that needs to be done at desctruction time
  // (e.g. close files, deallocate resources etc.)

}


//
// member functions
//

// ------------ method called on each new Event  ------------
bool PhotonIsoProducer::filter(edm::Event& iEvent, const edm::EventSetup& iSetup) {
    using namespace edm;

        std::auto_ptr<edm::ValueMap<double> > chIsoMap(new edm::ValueMap<double>() );
    edm::ValueMap<double>::Filler chFiller(*chIsoMap);

        std::auto_ptr<edm::ValueMap<double> > phIsoMap(new edm::ValueMap<double>() );
    edm::ValueMap<double>::Filler phFiller(*phIsoMap);

        std::auto_ptr<edm::ValueMap<double> > nhIsoMap(new edm::ValueMap<double>() );
    edm::ValueMap<double>::Filler nhFiller(*nhIsoMap);

    Handle<reco::VertexCollection>  vertexCollection;
    iEvent.getByLabel(vertexTag_, vertexCollection);

    Handle<reco::PhotonCollection> phoCollection;
    iEvent.getByLabel(photonTag_, phoCollection);
    const reco::PhotonCollection *recoPho = phoCollection.product();

    // All PF Candidate for alternate isolation
    Handle<reco::PFCandidateCollection> pfCandidatesH;
    iEvent.getByLabel(particleFlowTag_, pfCandidatesH);
    const  PFCandidateCollection thePfColl = *(pfCandidatesH.product());

        std::vector<double> chIsoValues;
    std::vector<double> phIsoValues;
    std::vector<double> nhIsoValues;
        chIsoValues.reserve(phoCollection->size());
        phIsoValues.reserve(phoCollection->size());
        nhIsoValues.reserve(phoCollection->size());
   
    unsigned int ivtx = 0;
    VertexRef myVtxRef(vertexCollection, ivtx);


        for (reco::PhotonCollection::const_iterator aPho = recoPho->begin(); aPho != recoPho->end(); ++aPho) {

          isolator.fGetIsolation(&*aPho, 
                         &thePfColl, 
                 myVtxRef, 
                 vertexCollection);

      if(verbose_) {
        std::cout << " run " << iEvent.id().run() << " lumi " << iEvent.id().luminosityBlock() << " event " << iEvent.id().event();
        std::cout << " pt " <<  aPho->pt() << " eta " << aPho->eta() << " phi " << aPho->phi() 
              << " charge " << aPho->charge()<< " : " << std::endl;;
        
        std::cout << " ChargedIso " << isolator.getIsolationCharged() << std::endl;
        std::cout << " PhotonIso " << isolator.getIsolationPhoton() << std::endl;
        std::cout << " NeutralHadron Iso " << isolator.getIsolationNeutral()  << std::endl;
      }

      chIsoValues.push_back(isolator.getIsolationCharged());
      phIsoValues.push_back(isolator.getIsolationPhoton());
      nhIsoValues.push_back(isolator.getIsolationNeutral());

    }

    chFiller.insert(phoCollection, chIsoValues.begin(), chIsoValues.end() );
    chFiller.fill();
    
    phFiller.insert(phoCollection, phIsoValues.begin(), phIsoValues.end() );
    phFiller.fill();
    
    nhFiller.insert(phoCollection, nhIsoValues.begin(), nhIsoValues.end() );
    nhFiller.fill();
    
    
    iEvent.put(chIsoMap,nameIsoCh_);
    iEvent.put(phIsoMap,nameIsoPh_);
    iEvent.put(nhIsoMap,nameIsoNh_);
    
      
    return true;
}

//define this as a plug-in
DEFINE_FWK_MODULE(PhotonIsoProducer);