Acts::KalmanVertexUpdater Namespace Reference

Namespaces
namespace	detail

Classes
struct	MatrixCache
	adds or removes track from or updates current vertex Based on R. Frühwirth et al. Vertex reconstruction and track bundling at the lep collider using robust Algorithms Computer Physics Comm.: 96 (1996) 189, chapter 2.1 More...

Functions
template<typename input_track_t >
void	updateVertexWithTrack (Vertex< input_track_t > &vtx, TrackAtVertex< input_track_t > &trk)
	Updates vertex with knowledge of new track.
template<typename input_track_t >
void	updatePosition (const Acts::Vertex< input_track_t > &vtx, const Acts::LinearizedTrack &linTrack, double trackWeight, int sign, MatrixCache &matrixCache)
	Updates vertex position.

Function Documentation

template<typename input_track_t >

void Acts::KalmanVertexUpdater::updatePosition	(	const Acts::Vertex< input_track_t > &	vtx,
		const Acts::LinearizedTrack &	linTrack,
		double	trackWeight,
		int	sign,
		MatrixCache &	matrixCache
	)

Updates vertex position.

Parameters

	vtx	Old vertex
	linTrack	Linearized version of track to be added or removed
	trackWeight	Track weight
	sign	+1 (add track) or -1 (remove track)
[out]	matrixCache	A cache to store matrix information

Returns

Vertex with updated position and covariance

Definition at line 63 of file KalmanVertexUpdater.ipp.

View newest version in sPHENIX GitHub at line 63 of file KalmanVertexUpdater.ipp

References Acts::LinearizedTrack::constantTerm, Acts::Vertex< input_track_t >::covariance(), Acts::LinearizedTrack::momentumJacobian, Acts::KalmanVertexUpdater::MatrixCache::momWeightInv, Acts::KalmanVertexUpdater::MatrixCache::newVertexCov, Acts::KalmanVertexUpdater::MatrixCache::newVertexPos, Acts::KalmanVertexUpdater::MatrixCache::newVertexWeight, Acts::KalmanVertexUpdater::MatrixCache::oldVertexWeight, Acts::LinearizedTrack::parametersAtPCA, Acts::Vertex< input_track_t >::position(), Acts::LinearizedTrack::positionJacobian, and Acts::LinearizedTrack::weightAtPCA.

Referenced by Acts::KalmanVertexUpdater::detail::update().

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template<typename input_track_t >

void Acts::KalmanVertexUpdater::updateVertexWithTrack	(	Vertex< input_track_t > &	vtx,
		TrackAtVertex< input_track_t > &	trk
	)

Updates vertex with knowledge of new track.

Note

KalmanVertexUpdater updates the vertex w.r.t. the newly given track, but does NOT add the track to the TrackAtVertex list. Has to be done manually after calling this method

Parameters

vtx	Vertex to be updated
trk	Track to be used for updating the vertex

Definition at line 13 of file KalmanVertexUpdater.ipp.

View newest version in sPHENIX GitHub at line 13 of file KalmanVertexUpdater.ipp