HCALAndBREMLinker.cc

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#include "RecoParticleFlow/PFProducer/interface/BlockElementLinkerBase.h"
#include "DataFormats/ParticleFlowReco/interface/PFCluster.h"
#include "DataFormats/ParticleFlowReco/interface/PFBlockElementCluster.h"
#include "DataFormats/ParticleFlowReco/interface/PFBlockElementBrem.h"
#include "RecoParticleFlow/PFClusterTools/interface/LinkByRecHit.h"

class HCALAndBREMLinker : public BlockElementLinkerBase {
public:
  HCALAndBREMLinker(const edm::ParameterSet& conf)
      : BlockElementLinkerBase(conf),
        useKDTree_(conf.getParameter<bool>("useKDTree")),
        debug_(conf.getUntrackedParameter<bool>("debug", false)) {}

  double testLink(const reco::PFBlockElement*, const reco::PFBlockElement*) const override;

private:
  bool useKDTree_, debug_;
};

DEFINE_EDM_PLUGIN(BlockElementLinkerFactory, HCALAndBREMLinker, "HCALAndBREMLinker");

double HCALAndBREMLinker::testLink(const reco::PFBlockElement* elem1, const reco::PFBlockElement* elem2) const {
  constexpr reco::PFTrajectoryPoint::LayerType HCALEnt = reco::PFTrajectoryPoint::HCALEntrance;
  const reco::PFBlockElementCluster* hcalelem(nullptr);
  const reco::PFBlockElementBrem* bremelem(nullptr);
  double dist(-1.0);
  if (elem1->type() < elem2->type()) {
    hcalelem = static_cast<const reco::PFBlockElementCluster*>(elem1);
    bremelem = static_cast<const reco::PFBlockElementBrem*>(elem2);
  } else {
    hcalelem = static_cast<const reco::PFBlockElementCluster*>(elem2);
    bremelem = static_cast<const reco::PFBlockElementBrem*>(elem1);
  }
  const reco::PFClusterRef& clusterref = hcalelem->clusterRef();
  const reco::PFRecTrack& track = bremelem->trackPF();
  const reco::PFTrajectoryPoint& tkAtHCAL = track.extrapolatedPoint(HCALEnt);
  if (tkAtHCAL.isValid()) {
    dist = LinkByRecHit::testTrackAndClusterByRecHit(track, *clusterref, true, debug_);
  }
  return dist;
}