ShiftedPFCandidateProducerForPFMVAMEt.cc

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#include "PhysicsTools/PatUtils/plugins/ShiftedPFCandidateProducerForPFMVAMEt.h"

#include "DataFormats/Math/interface/deltaR.h"

const double dRDefault = 1000;

ShiftedPFCandidateProducerForPFMVAMEt::ShiftedPFCandidateProducerForPFMVAMEt(const edm::ParameterSet& cfg)
  : moduleLabel_(cfg.getParameter<std::string>("@module_label"))
  , srcPFCandidatesToken_(consumes<reco::PFCandidateCollection>(cfg.getParameter<edm::InputTag>("srcPFCandidates")))
  , srcUnshiftedObjectsToken_(consumes<CandidateView>(cfg.getParameter<edm::InputTag>("srcUnshiftedObjects")))
  , srcShiftedObjectsToken_(consumes<CandidateView>(cfg.getParameter<edm::InputTag>("srcShiftedObjects")))
{
  dRmatch_PFCandidate_ = cfg.getParameter<double>("dRmatch_PFCandidate");
  dRmatch_Object_ = cfg.exists("dRmatch_Object") ?
    cfg.getParameter<double>("dRmatch_Object") : 0.1;

  dR2match_PFCandidate_ = dRmatch_PFCandidate_*dRmatch_PFCandidate_; 
  dR2match_Object_ = dRmatch_Object_*dRmatch_Object_;
  
  produces<reco::PFCandidateCollection>();
}

ShiftedPFCandidateProducerForPFMVAMEt::~ShiftedPFCandidateProducerForPFMVAMEt()
{
// nothing to be done yet...
}

void ShiftedPFCandidateProducerForPFMVAMEt::produce(edm::Event& evt, const edm::EventSetup& es)
{
  edm::Handle<reco::PFCandidateCollection> originalPFCandidates;
  evt.getByToken(srcPFCandidatesToken_, originalPFCandidates);

  edm::Handle<CandidateView> unshiftedObjects;
  evt.getByToken(srcUnshiftedObjectsToken_, unshiftedObjects);

  edm::Handle<CandidateView> shiftedObjects;
  evt.getByToken(srcShiftedObjectsToken_, shiftedObjects);

  objects_.clear();

  std::vector<bool> match(shiftedObjects->size(), false);
  int prevMatch=-1;
  int cnt = 0;

  for ( CandidateView::const_iterator unshiftedObject = unshiftedObjects->begin();
    unshiftedObject != unshiftedObjects->end(); ++unshiftedObject ) {
    bool isMatched_Object = false;
    double dR2bestMatch_Object = dRDefault;
    reco::Candidate::LorentzVector shiftedObjectP4_matched;
    prevMatch=-1;
    
    for ( CandidateView::const_iterator shiftedObject = shiftedObjects->begin();
    shiftedObject != shiftedObjects->end(); ++shiftedObject ) {
      if( match[ cnt ] ) continue;

      double dR2 = deltaR2(unshiftedObject->p4(), shiftedObject->p4());
      if ( dR2 < dR2match_Object_ && dR2 < dR2bestMatch_Object ) {
    shiftedObjectP4_matched = shiftedObject->p4();
    isMatched_Object = true;
    dR2bestMatch_Object = dR2;

    prevMatch = cnt;
      }
      cnt++;
    }
    if ( isMatched_Object ) {
      //Ambiguity removal
      match[ prevMatch ] = true;
      objects_.push_back(objectEntryType(shiftedObjectP4_matched, unshiftedObject->p4(), sqrt(dR2bestMatch_Object)));
    }
  }

  match.assign(objects_.size(), false);

  auto shiftedPFCandidates = std::make_unique<reco::PFCandidateCollection>();

  for ( reco::PFCandidateCollection::const_iterator originalPFCandidate = originalPFCandidates->begin();
    originalPFCandidate != originalPFCandidates->end(); ++originalPFCandidate ) {

    double shift = 0.;
    bool applyShift = false;
    double dR2bestMatch_PFCandidate = dRDefault;
    prevMatch=-1;
    cnt = 0;
    
    for ( std::vector<objectEntryType>::const_iterator object = objects_.begin();
      object != objects_.end(); ++object ) {
      if ( !object->isValidMatch_ ) continue;
      if( match[ cnt ] ) continue;

      double dR2 = deltaR2(originalPFCandidate->p4(), object->unshiftedObjectP4_);
      if ( dR2 < dR2match_PFCandidate_ && dR2 < dR2bestMatch_PFCandidate ) {
    shift = object->shift_;
    applyShift = true;
    dR2bestMatch_PFCandidate = dR2;

    prevMatch = cnt;
      }
      cnt++;
    }

    reco::Candidate::LorentzVector shiftedPFCandidateP4 = originalPFCandidate->p4();
    if ( applyShift ) {
      //Ambiguity removal
      match[ prevMatch ] = true;
     
      shiftedPFCandidateP4 *= (1. + shift);
    }

    reco::PFCandidate shiftedPFCandidate(*originalPFCandidate);
    shiftedPFCandidate.setP4(shiftedPFCandidateP4);

    shiftedPFCandidates->push_back(shiftedPFCandidate);
  }

  evt.put(std::move(shiftedPFCandidates));
}

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

DEFINE_FWK_MODULE(ShiftedPFCandidateProducerForPFMVAMEt);