Acts::KalmanVertexUpdater::detail Namespace Reference

Functions
template<typename input_track_t >
double	vertexPositionChi2 (const Vertex< input_track_t > &oldVtx, const MatrixCache &matrixCache)
	Takes old and new vtx and calculates position chi2.
template<typename input_track_t >
double	trackParametersChi2 (const LinearizedTrack &linTrack, const MatrixCache &matrixCache)
	Calculates chi2 of refitted track parameters w.r.t. updated vertex.
template<typename input_track_t >
void	update (Vertex< input_track_t > &vtx, TrackAtVertex< input_track_t > &trk, int sign)
	Adds or removes (depending on sign) tracks from vertex and updates the vertex.

Function Documentation

template<typename input_track_t >

double Acts::KalmanVertexUpdater::detail::trackParametersChi2	(	const LinearizedTrack &	linTrack,
		const MatrixCache &	matrixCache
	)

Calculates chi2 of refitted track parameters w.r.t. updated vertex.

Parameters

linTrack	Linearized version of track
matrixCache	A cache to store matrix information

Returns

Chi2

Definition at line 115 of file KalmanVertexUpdater.ipp.

View newest version in sPHENIX GitHub at line 115 of file KalmanVertexUpdater.ipp

References Acts::LinearizedTrack::constantTerm, Acts::LinearizedTrack::momentumJacobian, Acts::KalmanVertexUpdater::MatrixCache::momWeightInv, Acts::KalmanVertexUpdater::MatrixCache::newVertexPos, Acts::LinearizedTrack::parametersAtPCA, Acts::LinearizedTrack::positionJacobian, and Acts::LinearizedTrack::weightAtPCA.

template<typename input_track_t >

void Acts::KalmanVertexUpdater::detail::update	(	Vertex< input_track_t > &	vtx,
		TrackAtVertex< input_track_t > &	trk,
		int	sign
	)

Adds or removes (depending on sign) tracks from vertex and updates the vertex.

Parameters

vtx	Vertex to be updated
trk	Track to be added to/removed from vtx
sign	+1 (add track) or -1 (remove track)

Definition at line 20 of file KalmanVertexUpdater.ipp.

View newest version in sPHENIX GitHub at line 20 of file KalmanVertexUpdater.ipp

References Acts::TrackAtVertex< input_track_t >::chi2Track, Acts::Vertex< input_track_t >::fitQuality(), Acts::TrackAtVertex< input_track_t >::linearizedState, Acts::TrackAtVertex< input_track_t >::ndf, Acts::KalmanVertexUpdater::MatrixCache::newVertexCov, Acts::KalmanVertexUpdater::MatrixCache::newVertexPos, Acts::TrackAtVertex< input_track_t >::trackWeight, Acts::KalmanVertexUpdater::updatePosition(), and vtx().

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template<typename input_track_t >

double Acts::KalmanVertexUpdater::detail::vertexPositionChi2	(	const Vertex< input_track_t > &	oldVtx,
		const MatrixCache &	matrixCache
	)

Takes old and new vtx and calculates position chi2.

Parameters

oldVtx	Old vertex
matrixCache	A cache to store matrix information

Returns

Chi2

Definition at line 106 of file KalmanVertexUpdater.ipp.

View newest version in sPHENIX GitHub at line 106 of file KalmanVertexUpdater.ipp

References Acts::KalmanVertexUpdater::MatrixCache::newVertexPos, Acts::KalmanVertexUpdater::MatrixCache::oldVertexWeight, and Acts::Vertex< input_track_t >::position().

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