GsfConstraintAtVertex Class Reference

#include <GsfConstraintAtVertex.h>

Public Member Functions
TrajectoryStateOnSurface	constrainAtBeamSpot (const reco::GsfTrack &, const reco::BeamSpot &) const
	(multi)TSOS after including the beamspot More...
TrajectoryStateOnSurface	constrainAtPoint (const reco::GsfTrack &, const GlobalPoint &globalPosition, const GlobalError &globalError) const
	(multi)TSOS after including a point with covariance matrix More...
TrajectoryStateOnSurface	constrainAtVertex (const reco::GsfTrack &, const reco::Vertex &) const
	(multi)TSOS after include a vertex More...
	GsfConstraintAtVertex (const TrackerGeometry *geometry, const MagneticField *magField)

Private Attributes
const TrackerGeometry *	geometry_
GsfPropagatorAdapter	gsfPropagator_
GsfMultiStateUpdator	gsfUpdator_
const MagneticField *	magField_
MultiTrajectoryStateTransform	multiStateTransformer_
TransverseImpactPointExtrapolator	tipExtrapolator_

Detailed Description

Definition at line 23 of file GsfConstraintAtVertex.h.

Constructor & Destructor Documentation

GsfConstraintAtVertex()

GsfConstraintAtVertex::GsfConstraintAtVertex ( const TrackerGeometry *  geometry, const MagneticField *  magField  )

explicit

Definition at line 19 of file GsfConstraintAtVertex.cc.

    : geometry_(geometry),
      magField_(magField),
      gsfPropagator_(AnalyticalPropagator(magField, anyDirection)),
      tipExtrapolator_(gsfPropagator_) {}

Member Function Documentation

constrainAtBeamSpot()

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

(multi)TSOS after including the beamspot

Definition at line 25 of file GsfConstraintAtVertex.cc.

References pwdgSkimBPark_cfi::beamSpot, constrainAtPoint(), and HLT_2024v12_cff::track.

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

                                                                                                        {
  //
  // Beamspot (global co-ordinates)
  //
  GlobalPoint bsPosGlobal(beamSpot.x0(), beamSpot.y0(), beamSpot.z0());
  GlobalError bsCovGlobal(beamSpot.rotatedCovariance3D());
  //
  return constrainAtPoint(track, bsPosGlobal, bsCovGlobal);
}

constrainAtPoint()

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 47 of file GsfConstraintAtVertex.cc.

References TRecHit2DPosConstraint::build(), TransverseImpactPointExtrapolator::extrapolate(), geometry_, gsfUpdator_, MultiTrajectoryStateTransform::innerStateOnSurface(), TrajectoryStateOnSurface::isValid(), magField_, multiStateTransformer_, TrajectoryStateOnSurface::surface(), tipExtrapolator_, GloballyPositioned< T >::toLocal(), HLT_2024v12_cff::track, 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());
  auto 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;
}

constrainAtVertex()

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

(multi)TSOS after include a vertex

Definition at line 36 of file GsfConstraintAtVertex.cc.

References constrainAtPoint(), HLT_2024v12_cff::track, and bphysicsOniaDQM_cfi::vertex.

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

Member Data Documentation

geometry_

const TrackerGeometry* GsfConstraintAtVertex::geometry_

private

Definition at line 39 of file GsfConstraintAtVertex.h.

Referenced by constrainAtPoint().

gsfPropagator_

GsfPropagatorAdapter GsfConstraintAtVertex::gsfPropagator_

private

Definition at line 41 of file GsfConstraintAtVertex.h.

gsfUpdator_

GsfMultiStateUpdator GsfConstraintAtVertex::gsfUpdator_

private

Definition at line 38 of file GsfConstraintAtVertex.h.

Referenced by constrainAtPoint().

magField_

const MagneticField* GsfConstraintAtVertex::magField_

private

Definition at line 40 of file GsfConstraintAtVertex.h.

Referenced by constrainAtPoint().

multiStateTransformer_

MultiTrajectoryStateTransform GsfConstraintAtVertex::multiStateTransformer_

private

Definition at line 37 of file GsfConstraintAtVertex.h.

Referenced by constrainAtPoint().

tipExtrapolator_

TransverseImpactPointExtrapolator GsfConstraintAtVertex::tipExtrapolator_

private

Definition at line 42 of file GsfConstraintAtVertex.h.

Referenced by constrainAtPoint().