#include <JetSignalVertexCompatibilityAlgo.h>

Classes
struct	RefToBaseLess

Public Member Functions
std::vector< float >	compatibility (const reco::VertexCollection &vertices, const reco::TrackRefVector &tracks) const

	JetSignalVertexCompatibilityAlgo (double cut, double temperature)

void	resetEvent (const TransientTrackBuilder *trackBuilder)

	~JetSignalVertexCompatibilityAlgo ()

Private Types
typedef std::map< reco::TrackBaseRef, reco::TransientTrack, RefToBaseLess< reco::Track > >	TransientTrackMap

Private Member Functions
double	activation (double compat) const

const TransientTrack &	convert (const reco::TrackBaseRef &track) const

Static Private Member Functions
static double	trackVertexCompat (const reco::Vertex &vtx, const TransientTrack &track)

Private Attributes
const double	cut

const double	temperature

const TransientTrackBuilder *	trackBuilder

TransientTrackMap	trackMap

Detailed Description

Definition at line 16 of file JetSignalVertexCompatibilityAlgo.h.

Member Typedef Documentation

typedef std::map<reco::TrackBaseRef, reco::TransientTrack, RefToBaseLess<reco::Track> > reco::JetSignalVertexCompatibilityAlgo::TransientTrackMap

private

Definition at line 37 of file JetSignalVertexCompatibilityAlgo.h.

Constructor & Destructor Documentation

JetSignalVertexCompatibilityAlgo::JetSignalVertexCompatibilityAlgo	(	double	cut,
		double	temperature
	)

Definition at line 30 of file JetSignalVertexCompatibilityAlgo.cc.

                                                     :
     cut(cut), temperature(temperature)
 {}

JetSignalVertexCompatibilityAlgo::~JetSignalVertexCompatibilityAlgo ( )

Definition at line 35 of file JetSignalVertexCompatibilityAlgo.cc.

36 {}

Member Function Documentation

double JetSignalVertexCompatibilityAlgo::activation ( double compat ) const

private

Definition at line 74 of file JetSignalVertexCompatibilityAlgo.cc.

References cut, JetChargeProducer_cfi::exp, and temperature.

Referenced by compatibility().

 {
     return 1. / (std::exp((compat - cut) / temperature) + 1.);
 }

std::vector< float > JetSignalVertexCompatibilityAlgo::compatibility	(	const reco::VertexCollection &	vertices,
		const reco::TrackRefVector &	tracks
	)		const

Definition at line 80 of file JetSignalVertexCompatibilityAlgo.cc.

References activation(), edm::RefVector< C, T, F >::begin(), convert(), MillePedeFileConverter_cfg::e, edm::RefVector< C, T, F >::end(), i, mps_fire::result, HiIsolationCommonParameters_cff::track, and trackVertexCompat().

Referenced by JetSignalVertexCompatibility::produce().

 {
     std::vector<float> result(vertices.size(), 0.);
     float sum = 0.;
 
     for(TrackRefVector::const_iterator track = tracks.begin();
         track != tracks.end(); ++track) {
         const TransientTrack &transientTrack =
                     convert(TrackBaseRef(*track));
 
         for(unsigned int i = 0; i < vertices.size(); i++) {
             double compat =
                 trackVertexCompat(vertices[i], transientTrack);
             double contribution =
                 activation(compat) * (*track)->pt();
 
             result[i] += contribution;
             sum += contribution;
         }
     }
 
     if (sum < 1.0e-9) {
         for(unsigned int i = 0; i < result.size(); i++)
             result[i] = 1.0 / result.size();
     } else {
         for(unsigned int i = 0; i < result.size(); i++)
             result[i] /= sum;
     }
 
     return result;
 }

const TransientTrack & JetSignalVertexCompatibilityAlgo::convert ( const reco::TrackBaseRef & track ) const

private

Definition at line 61 of file JetSignalVertexCompatibilityAlgo.cc.

References TransientTrackBuilder::build(), edm::RefToBase< T >::castTo(), HiIsolationCommonParameters_cff::track, trackBuilder, and trackMap.

Referenced by compatibility().

 {
     TransientTrackMap::iterator pos = trackMap.lower_bound(track);
     if (pos != trackMap.end() && pos->first == track)
         return pos->second;
 
     // the castTo will only work with regular, i.e. no GsfTracks
     // the interface is not intrinsically polymorph...
     return trackMap.insert(pos,
         std::make_pair(track, trackBuilder->build(
                     track.castTo<TrackRef>())))->second;
 }

void JetSignalVertexCompatibilityAlgo::resetEvent ( const TransientTrackBuilder * trackBuilder )

Definition at line 114 of file JetSignalVertexCompatibilityAlgo.cc.

References trackBuilder, and trackMap.

Referenced by JetSignalVertexCompatibility::produce().

 {
     trackMap.clear();
     trackBuilder = builder;
 }

double JetSignalVertexCompatibilityAlgo::trackVertexCompat	(	const reco::Vertex &	vtx,
		const TransientTrack &	track
	)

staticprivate

Definition at line 38 of file JetSignalVertexCompatibilityAlgo.cc.

References RecoVertex::convertError(), RecoVertex::convertPos(), reco::Vertex::covariance(), dir, reco::TransientTrack::field(), TrajectoryStateOnSurface::globalPosition(), reco::TransientTrack::impactPointState(), reco::Vertex::position(), and mathSSE::sqrt().

Referenced by compatibility().

 {
     GlobalPoint point1 = RecoVertex::convertPos(vtx.position());
     AnalyticalImpactPointExtrapolator extrap(track.field());
     TrajectoryStateOnSurface tsos =
             extrap.extrapolate(track.impactPointState(), point1);
 
     if (!tsos.isValid())
         return 1.0e6;
 
     GlobalPoint point2 = tsos.globalPosition();
     ROOT::Math::SVector<double, 3> dir(point1.x() - point2.x(),
                                        point1.y() - point2.y(),
                                        point1.z() - point2.z());
     GlobalError cov = RecoVertex::convertError(vtx.covariance()) +
                       tsos.cartesianError().position();
 
     return ROOT::Math::Mag2(dir) /
            std::sqrt(ROOT::Math::Similarity(cov.matrix(), dir));
 }