#include <GsfConstraintAtVertex.h>

Public Member Functions
TrajectoryStateOnSurface	constrainAtBeamSpot (const reco::GsfTrack &, const reco::BeamSpot &) const
	(multi)TSOS after including the beamspot
TrajectoryStateOnSurface	constrainAtPoint (const reco::GsfTrack &, const GlobalPoint &globalPosition, const GlobalError &globalError) const
	(multi)TSOS after including a point with covariance matrix
TrajectoryStateOnSurface	constrainAtVertex (const reco::GsfTrack &, const reco::Vertex &) const
	(multi)TSOS after include a vertex
	GsfConstraintAtVertex (const edm::EventSetup &)
	~GsfConstraintAtVertex ()
Private Attributes
const TrackerGeometry *	geometry_
GsfPropagatorAdapter *	gsfPropagator_
GsfMultiStateUpdator	gsfUpdator_
const MagneticField *	magField_
MultiTrajectoryStateTransform	multiStateTransformer_
TransverseImpactPointExtrapolator *	tipExtrapolator_

Detailed Description

Definition at line 21 of file GsfConstraintAtVertex.h.

Constructor & Destructor Documentation

GsfConstraintAtVertex::GsfConstraintAtVertex ( const edm::EventSetup & setup ) [explicit]

Definition at line 20 of file GsfConstraintAtVertex.cc.

References AnalyticalPropagator_cfi::AnalyticalPropagator, anyDirection, geometry_, edm::EventSetup::get(), gsfPropagator_, magField_, edm::ESHandle< T >::product(), and tipExtrapolator_.

{
  edm::ESHandle<TrackerGeometry> geometryHandle;
  setup.get<TrackerDigiGeometryRecord>().get(geometryHandle);
  geometry_ = geometryHandle.product();

  edm::ESHandle<MagneticField> magFieldHandle;
  setup.get<IdealMagneticFieldRecord>().get(magFieldHandle);
  magField_ = magFieldHandle.product();

//   edm::ESHandle<Propagator> propagatorHandle;
//   setup.get<TrackingComponentsRecord>().get(propagatorName_,propagatorHandle);
//   propagator_ = propagatorHandle.product();
  gsfPropagator_ = new GsfPropagatorAdapter(AnalyticalPropagator(magField_,anyDirection));
  tipExtrapolator_  = new TransverseImpactPointExtrapolator(*gsfPropagator_);
}

GsfConstraintAtVertex::~GsfConstraintAtVertex ( )

Definition at line 37 of file GsfConstraintAtVertex.cc.

References gsfPropagator_, and tipExtrapolator_.

{
  delete tipExtrapolator_;
  delete gsfPropagator_;
}

Member Function Documentation

TrajectoryStateOnSurface GsfConstraintAtVertex::constrainAtBeamSpot	(	const reco::GsfTrack &	track,
		const reco::BeamSpot &	beamSpot
	)		const

(multi)TSOS after including the beamspot

Definition at line 45 of file GsfConstraintAtVertex.cc.

References constrainAtPoint(), reco::BeamSpot::covariance3D(), reco::BeamSpot::x0(), reco::BeamSpot::y0(), and reco::BeamSpot::z0().

Referenced by GsfElectronAlgo::ElectronData::calculateTSOS().

{
  //
  // Beamspot (global co-ordinates)
  //
  GlobalPoint bsPosGlobal(beamSpot.x0(),beamSpot.y0(),beamSpot.z0());
  GlobalError bsCovGlobal(beamSpot.covariance3D());
  //
  return constrainAtPoint(track,bsPosGlobal,bsCovGlobal);
}

TrajectoryStateOnSurface GsfConstraintAtVertex::constrainAtPoint	(	const reco::GsfTrack &	track,
		const GlobalPoint &	globalPosition,
		const GlobalError &	globalError
	)		const

(multi)TSOS after including a point with covariance matrix

Definition at line 71 of file GsfConstraintAtVertex.cc.

References newFWLiteAna::build, TransverseImpactPointExtrapolator::extrapolate(), geometry_, gsfUpdator_, MultiTrajectoryStateTransform::innerStateOnSurface(), TrajectoryStateOnSurface::isValid(), magField_, multiStateTransformer_, TrajectoryStateOnSurface::surface(), tipExtrapolator_, GloballyPositioned< T >::toLocal(), ErrorFrameTransformer::transform(), and GsfMultiStateUpdator::update().

Referenced by constrainAtBeamSpot(), and constrainAtVertex().

{
  //
  // Track on TIP plane
  //
  TrajectoryStateOnSurface innerState = 
    multiStateTransformer_.innerStateOnSurface(track,*geometry_,magField_);
  if ( !innerState.isValid() )  return TrajectoryStateOnSurface();
  TrajectoryStateOnSurface tipState = tipExtrapolator_->extrapolate(innerState,globalPosition);
  if ( !tipState.isValid() )  return TrajectoryStateOnSurface();
  //
  // RecHit from beam spot
  //
  LocalError bsCovLocal = ErrorFrameTransformer().transform(globalError,tipState.surface());
  TransientTrackingRecHit::RecHitPointer bsHit = 
    TRecHit2DPosConstraint::build(tipState.surface().toLocal(globalPosition),
                                  bsCovLocal,&tipState.surface());
  //
  // update with constraint
  //
  TrajectoryStateOnSurface updatedState = gsfUpdator_.update(tipState,*bsHit);
  if ( !updatedState.isValid() ) {
    edm::LogWarning("GsfConstraintAtVertex") << " GSF update with vertex constraint failed";
    return TrajectoryStateOnSurface();
  }

  return updatedState;
}

TrajectoryStateOnSurface GsfConstraintAtVertex::constrainAtVertex	(	const reco::GsfTrack &	track,
		const reco::Vertex &	vertex
	)		const

(multi)TSOS after include a vertex

Definition at line 58 of file GsfConstraintAtVertex.cc.

References constrainAtPoint(), reco::Vertex::covariance(), and reco::Vertex::position().

{
  //
  // Beamspot (global co-ordinates)
  //
  GlobalPoint vtxPosGlobal(vertex.position().x(),vertex.position().y(),vertex.position().z());
  GlobalError vtxCovGlobal(vertex.covariance());
  //
  return constrainAtPoint(track,vtxPosGlobal,vtxCovGlobal);
}