Acts::LinearizedTrack Class Reference

#include <acts/blob/sPHENIX/Core/include/Acts/Vertexing/LinearizedTrack.hpp>

Public Member Functions
	LinearizedTrack ()=default
	LinearizedTrack (const BoundVector &paramsAtPCA, const BoundSquareMatrix &parCovarianceAtPCA, const BoundSquareMatrix &parWeightAtPCA, const Vector4 &linPoint, const ActsMatrix< eBoundSize, 4 > &posJacobian, const ActsMatrix< eBoundSize, 3 > &momJacobian, const Vector4 &position, const Vector3 &momentum, const BoundVector &constTerm)
	Constructor taking perigee parameters and covariance matrix of track propagated to closest approach (PCA) of linearization point, position and momentum Jacobian and const term.

Public Attributes
BoundVector	parametersAtPCA {BoundVector::Zero()}
BoundSquareMatrix	covarianceAtPCA {BoundSquareMatrix::Zero()}
BoundSquareMatrix	weightAtPCA {BoundSquareMatrix::Zero()}
Vector4	linearizationPoint {Vector4::Zero()}
ActsMatrix< eBoundSize, 4 >	positionJacobian {ActsMatrix<eBoundSize, 4>::Zero()}
ActsMatrix< eBoundSize, 3 >	momentumJacobian {ActsMatrix<eBoundSize, 3>::Zero()}
Vector4	positionAtPCA {Vector4::Zero()}
Vector3	momentumAtPCA {Vector3::Zero()}
BoundVector	constantTerm {BoundVector::Zero()}

Detailed Description

Class for linear expansion of track parameters in vicinity of vertex

The measurement equation is linearized in the following way:

F_k= D_k (x_k - x_0k) + E_k (p_k - p_0k) + F^0_k

where F_k are the parameters at perigee nearest to the linearization point, x_k is the position of the vertex, p_k the track momentum at the vertex, and F^0_k is the constant term of expansion. D_k and E_k are matrices of derivatives, denoted hereafter as "positionJacobian" and "momentumJacobian" respectively.

Definition at line 31 of file LinearizedTrack.hpp.

View newest version in sPHENIX GitHub at line 31 of file LinearizedTrack.hpp

Constructor & Destructor Documentation

Acts::LinearizedTrack::LinearizedTrack ( )

default

Acts::LinearizedTrack::LinearizedTrack ( const BoundVector &  paramsAtPCA, const BoundSquareMatrix &  parCovarianceAtPCA, const BoundSquareMatrix &  parWeightAtPCA, const Vector4 &  linPoint, const ActsMatrix< eBoundSize, 4 > &  posJacobian, const ActsMatrix< eBoundSize, 3 > &  momJacobian, const Vector4 &  position, const Vector3 &  momentum, const BoundVector &  constTerm  )

inline

Constructor taking perigee parameters and covariance matrix of track propagated to closest approach (PCA) of linearization point, position and momentum Jacobian and const term.

Parameters

paramsAtPCA	Parameters at point of closest approach
parCovarianceAtPCA	Parameter covariance matrix at point of closest approach
parWeightAtPCA	The weight at the point of closest approach
linPoint	Linearization point
posJacobian	Position jacobian
momJacobian	Momentum jacobian
position	Position at point of closest approach
momentum	Momentum at point of closest approach
constTerm	Constant term in taylor expansion

Definition at line 48 of file LinearizedTrack.hpp.

View newest version in sPHENIX GitHub at line 48 of file LinearizedTrack.hpp

Member Data Documentation

BoundVector Acts::LinearizedTrack::constantTerm {BoundVector::Zero()}

Definition at line 74 of file LinearizedTrack.hpp.

View newest version in sPHENIX GitHub at line 74 of file LinearizedTrack.hpp

Referenced by Acts::Test::BOOST_AUTO_TEST_CASE(), Acts::KalmanVertexUpdater::detail::trackParametersChi2(), and Acts::KalmanVertexUpdater::updatePosition().

BoundSquareMatrix Acts::LinearizedTrack::covarianceAtPCA {BoundSquareMatrix::Zero()}

Definition at line 67 of file LinearizedTrack.hpp.

View newest version in sPHENIX GitHub at line 67 of file LinearizedTrack.hpp

Referenced by Acts::Test::BOOST_AUTO_TEST_CASE(), Acts::KalmanVertexUpdater::detail::trackParametersChi2(), and Acts::KalmanVertexUpdater::updatePosition().

Vector4 Acts::LinearizedTrack::linearizationPoint {Vector4::Zero()}

Definition at line 69 of file LinearizedTrack.hpp.

View newest version in sPHENIX GitHub at line 69 of file LinearizedTrack.hpp

Referenced by Acts::Test::BOOST_AUTO_TEST_CASE().

Vector3 Acts::LinearizedTrack::momentumAtPCA {Vector3::Zero()}

Definition at line 73 of file LinearizedTrack.hpp.

View newest version in sPHENIX GitHub at line 73 of file LinearizedTrack.hpp

ActsMatrix<eBoundSize, 3> Acts::LinearizedTrack::momentumJacobian {ActsMatrix<eBoundSize, 3>::Zero()}

Definition at line 71 of file LinearizedTrack.hpp.

View newest version in sPHENIX GitHub at line 71 of file LinearizedTrack.hpp

Referenced by Acts::Test::BOOST_AUTO_TEST_CASE(), Acts::KalmanVertexUpdater::detail::trackParametersChi2(), and Acts::KalmanVertexUpdater::updatePosition().

BoundVector Acts::LinearizedTrack::parametersAtPCA {BoundVector::Zero()}

Definition at line 66 of file LinearizedTrack.hpp.

View newest version in sPHENIX GitHub at line 66 of file LinearizedTrack.hpp

Referenced by Acts::Test::BOOST_AUTO_TEST_CASE(), Acts::KalmanVertexUpdater::detail::trackParametersChi2(), and Acts::KalmanVertexUpdater::updatePosition().

Vector4 Acts::LinearizedTrack::positionAtPCA {Vector4::Zero()}

Definition at line 72 of file LinearizedTrack.hpp.

View newest version in sPHENIX GitHub at line 72 of file LinearizedTrack.hpp

ActsMatrix<eBoundSize, 4> Acts::LinearizedTrack::positionJacobian {ActsMatrix<eBoundSize, 4>::Zero()}

Definition at line 70 of file LinearizedTrack.hpp.

View newest version in sPHENIX GitHub at line 70 of file LinearizedTrack.hpp

Referenced by Acts::Test::BOOST_AUTO_TEST_CASE(), Acts::KalmanVertexUpdater::detail::trackParametersChi2(), and Acts::KalmanVertexUpdater::updatePosition().

BoundSquareMatrix Acts::LinearizedTrack::weightAtPCA {BoundSquareMatrix::Zero()}

Definition at line 68 of file LinearizedTrack.hpp.

View newest version in sPHENIX GitHub at line 68 of file LinearizedTrack.hpp

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The documentation for this class was generated from the following file:

• acts/blob/sPHENIX/Core/include/Acts/Vertexing/LinearizedTrack.hpp