pat::LeptonVertexSignificance Class Reference

Calculates a lepton's vertex association significance. More...

#include "PhysicsTools/PatUtils/interface/LeptonVertexSignificance.h"

Public Member Functions
float	calculate (const Electron &anElectron, const reco::VertexCollection &vertices, const TransientTrackBuilder &builder)
float	calculate (const Muon &aMuon, const reco::VertexCollection &vertices, const TransientTrackBuilder &builder)
	LeptonVertexSignificance ()=default
	~LeptonVertexSignificance ()=default

Static Public Member Functions
static edm::InputTag	vertexCollectionTag ()

Private Member Functions
float	calculate (const reco::Track &track, const reco::VertexCollection &vertices, const TransientTrackBuilder &builder)

Detailed Description

Calculates a lepton's vertex association significance.

LeptonVertexSignificance calculates the significance of the association of the lepton to a given vertex, as defined in CMS Note 2006/024

Author

Steven Lowette

Definition at line 31 of file LeptonVertexSignificance.h.

Constructor & Destructor Documentation

LeptonVertexSignificance()

pat::LeptonVertexSignificance::LeptonVertexSignificance ( )

default

~LeptonVertexSignificance()

pat::LeptonVertexSignificance::~LeptonVertexSignificance ( )

default

Member Function Documentation

calculate() [1/3]

float LeptonVertexSignificance::calculate	(	const Electron &	anElectron,
		const reco::VertexCollection &	vertices,
		const TransientTrackBuilder &	builder
	)

Definition at line 18 of file LeptonVertexSignificance.cc.

References pat::Electron::gsfTrack(), and AlignmentTracksFromVertexSelector_cfi::vertices.

Referenced by calculate().

                                                                                {
  return this->calculate(*theElectron.gsfTrack(), vertices, builder);
}

calculate() [2/3]

float LeptonVertexSignificance::calculate	(	const Muon &	aMuon,
		const reco::VertexCollection &	vertices,
		const TransientTrackBuilder &	builder
	)

Definition at line 24 of file LeptonVertexSignificance.cc.

References calculate(), pat::Muon::track(), and AlignmentTracksFromVertexSelector_cfi::vertices.

                                                                                {
  return this->calculate(*theMuon.track(), vertices, builder);
}

calculate() [3/3]

float LeptonVertexSignificance::calculate ( const reco::Track &  track, const reco::VertexCollection &  vertices, const TransientTrackBuilder &  builder  )

private

Definition at line 31 of file LeptonVertexSignificance.cc.

References TransientTrackBuilder::build(), reco::Vertex::position(), funct::pow(), mathSSE::sqrt(), TrajectoryStateClosestToPoint::theState(), reco::TransientTrack::trajectoryStateClosestToPoint(), AlignmentTracksFromVertexSelector_cfi::vertices, and reco::Vertex::zError().

                                                                                {
  if (vertices.empty())
    return 0;
  reco::Vertex const& theVertex = vertices.front();
  // calculate the track-vertex association significance
  reco::TransientTrack theTrTrack = builder.build(&theTrack);
  GlobalPoint theVertexPoint(theVertex.position().x(), theVertex.position().y(), theVertex.position().z());
  FreeTrajectoryState theLeptonNearVertex = theTrTrack.trajectoryStateClosestToPoint(theVertexPoint).theState();
  return fabs(theVertex.position().z() - theLeptonNearVertex.position().z()) /
         sqrt(std::pow(theVertex.zError(), 2) + theLeptonNearVertex.cartesianError().position().czz());
}

vertexCollectionTag()

edm::InputTag LeptonVertexSignificance::vertexCollectionTag ( )

static

Definition at line 13 of file LeptonVertexSignificance.cc.

References ProducerED_cfi::InputTag.

                                                          {
  return edm::InputTag("offlinePrimaryVerticesFromCTFTracks");
}