GSFAndGSFLinker.cc

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#include "RecoParticleFlow/PFProducer/interface/BlockElementLinkerBase.h"
#include "DataFormats/ParticleFlowReco/interface/PFRecTrack.h"
#include "DataFormats/ParticleFlowReco/interface/PFBlockElementGsfTrack.h"
#include "DataFormats/ParticleFlowReco/interface/PFBlockElementBrem.h"
#include "RecoParticleFlow/PFClusterTools/interface/LinkByRecHit.h"

class GSFAndGSFLinker : public BlockElementLinkerBase {
public:
  GSFAndGSFLinker(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, GSFAndGSFLinker, "GSFAndGSFLinker");

double GSFAndGSFLinker::testLink(const reco::PFBlockElement* elem1, const reco::PFBlockElement* elem2) const {
  constexpr reco::PFBlockElement::TrackType T_FROM_GAMMACONV = reco::PFBlockElement::T_FROM_GAMMACONV;
  double dist = -1.0;
  const reco::PFBlockElementGsfTrack* gsfelem1 = static_cast<const reco::PFBlockElementGsfTrack*>(elem1);
  const reco::PFBlockElementGsfTrack* gsfelem2 = static_cast<const reco::PFBlockElementGsfTrack*>(elem2);
  const reco::GsfPFRecTrackRef& gsfref1 = gsfelem1->GsftrackRefPF();
  const reco::GsfPFRecTrackRef& gsfref2 = gsfelem2->GsftrackRefPF();
  if (gsfref1.isNonnull() && gsfref2.isNonnull()) {
    if (gsfelem1->trackType(T_FROM_GAMMACONV) !=  // we want **one** primary GSF
            gsfelem2->trackType(T_FROM_GAMMACONV) &&
        gsfref1->trackId() == gsfref2->trackId()) {
      dist = 0.001;
    }
  }
  return dist;
}