Skim_UpdatedMuonInnerTrackRef.cc

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#include <memory>
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/Framework/interface/EDProducer.h"
#include "FWCore/Framework/interface/Event.h"

#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/Common/interface/View.h"
#include "DataFormats/MuonReco/interface/Muon.h"
#include "DataFormats/MuonReco/interface/MuonFwd.h"
#include "DataFormats/TrackReco/interface/Track.h"

#include "CommonTools/UtilAlgos/interface/DeltaR.h"

//
// class declaration
//
class UpdatedMuonInnerTrackRef : public edm::EDProducer {
   public:
      explicit UpdatedMuonInnerTrackRef(const edm::ParameterSet&);
      ~UpdatedMuonInnerTrackRef() override;

   private:
      void beginJob() override ;
      void produce(edm::Event&, const edm::EventSetup&) override;
      void endJob() override ;

      reco::TrackRef findNewRef(reco::TrackRef oldTrackRef, edm::Handle<reco::TrackCollection>& newTrackCollection);

      edm::EDGetTokenT<edm::View<reco::Muon> > muonToken_;
      edm::EDGetTokenT<reco::TrackCollection> oldTrackToken_;
      edm::EDGetTokenT<reco::TrackCollection> newTrackToken_;

      double maxInvPtDiff;
      double minDR;
};


UpdatedMuonInnerTrackRef::UpdatedMuonInnerTrackRef(const edm::ParameterSet& pset)
{
   // What is being produced
   produces<std::vector<reco::Muon> >();

    // Input products
   muonToken_     = consumes<edm::View<reco::Muon> >(pset.getUntrackedParameter<edm::InputTag> ("MuonTag"    , edm::InputTag("muons")));
   oldTrackToken_ = consumes<reco::TrackCollection>(pset.getUntrackedParameter<edm::InputTag> ("OldTrackTag", edm::InputTag("generalTracks")));
   newTrackToken_ = consumes<reco::TrackCollection>(pset.getUntrackedParameter<edm::InputTag> ("NewTrackTag", edm::InputTag("generalTracksSkim")));

    // matching criteria products
   maxInvPtDiff=pset.getUntrackedParameter<double>("maxInvPtDiff", 0.005);
   minDR=pset.getUntrackedParameter<double>("minDR", 0.1);
}

UpdatedMuonInnerTrackRef::~UpdatedMuonInnerTrackRef(){
}

void UpdatedMuonInnerTrackRef::beginJob() {
}

void UpdatedMuonInnerTrackRef::endJob(){
}

void UpdatedMuonInnerTrackRef::produce(edm::Event& ev, const edm::EventSetup& iSetup)
{
      // Muon collection
      edm::Handle<edm::View<reco::Muon> > muonCollectionHandle;
      if (!ev.getByToken(muonToken_, muonCollectionHandle)) {
            edm::LogError("") << ">>> Muon collection does not exist !!!";
            return;
      }


      edm::Handle<reco::TrackCollection> oldTrackCollection;
      if (!ev.getByToken(oldTrackToken_, oldTrackCollection)) {
            edm::LogError("") << ">>> Old Track collection does not exist !!!";
            return;
      }

      edm::Handle<reco::TrackCollection> newTrackCollection;
      if (!ev.getByToken(newTrackToken_, newTrackCollection)) {
            edm::LogError("") << ">>> New Track collection does not exist !!!";
            return;
      }

      unsigned int muonCollectionSize = muonCollectionHandle->size();
      std::unique_ptr<reco::MuonCollection> newmuons (new reco::MuonCollection);


      for (unsigned int i=0; i<muonCollectionSize; i++) {
            edm::RefToBase<reco::Muon> mu = muonCollectionHandle->refAt(i);
            reco::Muon* newmu = mu->clone();

            if(mu->innerTrack().isNonnull()){
               reco::TrackRef newTrackRef = findNewRef(mu->innerTrack(), newTrackCollection);
/*               printf(" %6.2f %+6.2f %+6.2f --> ",mu->innerTrack()->pt (), mu->innerTrack()->eta(), mu->innerTrack()->phi());
               if(newTrackRef.isNonnull()){
                  printf(" %6.2f %+6.2f %+6.2f\n",newTrackRef->pt (), newTrackRef->eta(), newTrackRef->phi());
               }else{
                  printf("\n");
               }
*/
               newmu->setInnerTrack(newTrackRef);
            }

            newmuons->push_back(*newmu);
      }

      ev.put(std::move(newmuons));
}

reco::TrackRef UpdatedMuonInnerTrackRef::findNewRef(reco::TrackRef oldTrackRef, edm::Handle<reco::TrackCollection>& newTrackCollection){
   float dRMin=1000; int found = -1;
   for(unsigned int i=0;i<newTrackCollection->size();i++){
      reco::TrackRef newTrackRef  = reco::TrackRef( newTrackCollection, i );
      if(newTrackRef.isNull())continue;

      if( fabs( (1.0/newTrackRef->pt())-(1.0/oldTrackRef->pt())) > maxInvPtDiff) continue;
      float dR = deltaR(newTrackRef->momentum(), oldTrackRef->momentum());
      if(dR <= minDR && dR < dRMin){ dRMin=dR; found = i;}
   }

   if(found>=0){
      return reco::TrackRef( newTrackCollection, found );
   }else{
      return reco::TrackRef();
   }
}

DEFINE_FWK_MODULE(UpdatedMuonInnerTrackRef);