TrajectoryStateClosestToBeamLine Class Reference

#include <TrajectoryStateClosestToBeamLine.h>

Public Types
typedef FreeTrajectoryState	FTS

Public Member Functions
GlobalPoint const &	beamLinePCA () const
reco::BeamSpot const &	beamSpot ()
bool	isValid () const
FTS const &	trackStateAtPCA () const
	TrajectoryStateClosestToBeamLine ()
	TrajectoryStateClosestToBeamLine (const FTS &stateAtPCA, const GlobalPoint &pointOnBeamLine, const reco::BeamSpot &beamSpot)
Measurement1D	transverseImpactParameter () const
	~TrajectoryStateClosestToBeamLine ()

Private Attributes
reco::BeamSpot	theBeamSpot
FTS	theFTS
GlobalPoint	thePointOnBeamLine
bool	valid

Detailed Description

Trajectory state defined at the point of closest approach (PCA) of the track to the beamline. It gives also access to the point on the beamline which is the closest to the track.

Definition at line 15 of file TrajectoryStateClosestToBeamLine.h.

Member Typedef Documentation

typedef FreeTrajectoryState TrajectoryStateClosestToBeamLine::FTS

Definition at line 19 of file TrajectoryStateClosestToBeamLine.h.

Constructor & Destructor Documentation

TrajectoryStateClosestToBeamLine::TrajectoryStateClosestToBeamLine ( )

inline

Definition at line 21 of file TrajectoryStateClosestToBeamLine.h.

: valid(false) {}

TrajectoryStateClosestToBeamLine::TrajectoryStateClosestToBeamLine ( const FTS &  stateAtPCA, const GlobalPoint &  pointOnBeamLine, const reco::BeamSpot &  beamSpot  )

inline

Definition at line 24 of file TrajectoryStateClosestToBeamLine.h.

                                    : 
      theFTS(stateAtPCA) , thePointOnBeamLine(pointOnBeamLine),
      theBeamSpot(beamSpot), valid(true)
  {}

TrajectoryStateClosestToBeamLine::~TrajectoryStateClosestToBeamLine ( )

inline

Definition at line 30 of file TrajectoryStateClosestToBeamLine.h.

{}

Member Function Documentation

GlobalPoint const& TrajectoryStateClosestToBeamLine::beamLinePCA ( ) const

inline

Point on the beamline which is the closest to the track

Definition at line 43 of file TrajectoryStateClosestToBeamLine.h.

References thePointOnBeamLine, and transverseImpactParameter().

                                          {
    return thePointOnBeamLine;
  }

reco::BeamSpot const& TrajectoryStateClosestToBeamLine::beamSpot ( void  )

inline

The beamline

Definition at line 56 of file TrajectoryStateClosestToBeamLine.h.

References theBeamSpot.

                                  {
    return theBeamSpot;
  }

bool TrajectoryStateClosestToBeamLine::isValid ( void  ) const

inline

Definition at line 60 of file TrajectoryStateClosestToBeamLine.h.

References valid.

Referenced by ntupleDataFormat._Object::_checkIsValid(), SeedForPhotonConversionFromQuadruplets::buildSeedBool(), DAFTrackProducerAlgorithm::buildTrack(), TrackProducerAlgorithm< reco::GsfTrack >::buildTrack(), TrackProducerAlgorithm< reco::Track >::buildTrack(), CosmicParametersDefinerForTP::momentum(), ParametersDefinerForTP::momentum(), TrackFilterForPVFinding::operator()(), CosmicTrackingParticleSelector::operator()(), MuonUpdatorAtVertex::propagate(), core.AutoHandle.AutoHandle::ReallyLoad(), TrackAlgoCompareUtil::SetTrackingParticleD0Dz(), CosmicParametersDefinerForTP::vertex(), and ParametersDefinerForTP::vertex().

{return valid;}

FTS const& TrajectoryStateClosestToBeamLine::trackStateAtPCA ( ) const

inline

State of the track at the PCA to the beamline

Definition at line 36 of file TrajectoryStateClosestToBeamLine.h.

References theFTS.

Referenced by SeedForPhotonConversionFromQuadruplets::buildSeedBool(), DAFTrackProducerAlgorithm::buildTrack(), TrackProducerAlgorithm< reco::Track >::buildTrack(), TrackProducerAlgorithm< reco::GsfTrack >::buildTrack(), PrimaryVertexValidation::fillTrackHistos(), ExoticaDQM::getGenParticleTrajectoryAtBeamline(), CosmicParametersDefinerForTP::momentum(), ParametersDefinerForTP::momentum(), CosmicTrackingParticleSelector::operator()(), MuonUpdatorAtVertex::propagate(), TrackAlgoCompareUtil::SetTrackingParticleD0Dz(), reco::trackingParametersAtClosestApproachToBeamSpot(), CosmicParametersDefinerForTP::vertex(), and ParametersDefinerForTP::vertex().

                                      {
    return theFTS;
  }

Measurement1D TrajectoryStateClosestToBeamLine::transverseImpactParameter

(

)

const

Transverse impact parameter of the track to the beamline. It is the transverse distance of the two PCAs.

Definition at line 4 of file TrajectoryStateClosestToBeamLine.cc.

References FreeTrajectoryState::cartesianError(), relativeConstraints::error, CartesianTrajectoryError::matrix(), FreeTrajectoryState::position(), reco::BeamSpot::rotatedCovariance3D(), mathSSE::sqrt(), theBeamSpot, theFTS, thePointOnBeamLine, PV3DBase< T, PVType, FrameType >::x(), and PV3DBase< T, PVType, FrameType >::y().

Referenced by beamLinePCA(), HLTmmkkFilter::hltFilter(), HLTmmkFilter::hltFilter(), TrackFilterForPVFinding::operator()(), HLTmumutktkVtxProducer::produce(), and HLTmumutkVtxProducer::produce().

{
  AlgebraicSymMatrix33 error = theBeamSpot.rotatedCovariance3D() +
    theFTS.cartesianError().matrix().Sub<AlgebraicSymMatrix33>(0,0);

  GlobalPoint impactPoint=theFTS.position();
  AlgebraicVector3 transverseFlightPath(
    impactPoint.x()-thePointOnBeamLine.x(),impactPoint.y()-thePointOnBeamLine.y(),0.);
  double length = ROOT::Math::Mag(transverseFlightPath);
  // Warning: after the transverseFlightPath.Unit() statement, the
  // transverseFlightPath vector is CHANGED to a UNIT vector.
  double ipError = sqrt( ROOT::Math::Similarity(transverseFlightPath.Unit(),error) );
  return Measurement1D (length, ipError);
}

Member Data Documentation

reco::BeamSpot TrajectoryStateClosestToBeamLine::theBeamSpot

private

Definition at line 66 of file TrajectoryStateClosestToBeamLine.h.

Referenced by beamSpot(), and transverseImpactParameter().

FTS TrajectoryStateClosestToBeamLine::theFTS

private

Definition at line 64 of file TrajectoryStateClosestToBeamLine.h.

Referenced by trackStateAtPCA(), and transverseImpactParameter().

GlobalPoint TrajectoryStateClosestToBeamLine::thePointOnBeamLine

private

Definition at line 65 of file TrajectoryStateClosestToBeamLine.h.

Referenced by beamLinePCA(), and transverseImpactParameter().

bool TrajectoryStateClosestToBeamLine::valid

private

Definition at line 67 of file TrajectoryStateClosestToBeamLine.h.

Referenced by isValid().