reco::VertexGhostTrackState Class Reference

#include <VertexGhostTrackState.h>

Inheritance diagram for reco::VertexGhostTrackState:

List of all members.

Public Member Functions
CovarianceMatrix	cartesianCovariance () const
GlobalError	cartesianError () const
GlobalPoint	globalPosition () const
	VertexGhostTrackState (const GlobalPoint &pos, const CovarianceMatrix &cov)
Vertex	vertexStateOnGhostTrack (const GhostTrackPrediction &pred, bool withMeasurementError) const
Vertex	vertexStateOnMeasurement (const GhostTrackPrediction &pred, bool withGhostTrackError) const
Private Member Functions
BasicGhostTrackState *	clone () const
Private Attributes
CovarianceMatrix	covariance_
GlobalPoint	position_

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Detailed Description

Definition at line 15 of file VertexGhostTrackState.h.

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Constructor & Destructor Documentation

reco::VertexGhostTrackState::VertexGhostTrackState	(	const GlobalPoint &	pos,
		const CovarianceMatrix &	cov
	)		[inline]

Definition at line 17 of file VertexGhostTrackState.h.

Referenced by clone().

                                                           :
                position_(pos), covariance_(cov) {}

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Member Function Documentation

CovarianceMatrix reco::VertexGhostTrackState::cartesianCovariance

(

)

const [inline, virtual]

Implements reco::BasicGhostTrackState.

Definition at line 23 of file VertexGhostTrackState.h.

References covariance_.

{ return covariance_; }

GlobalError reco::VertexGhostTrackState::cartesianError

(

)

const [inline, virtual]

Implements reco::BasicGhostTrackState.

Definition at line 22 of file VertexGhostTrackState.h.

References covariance_.

{ return covariance_; }

BasicGhostTrackState* reco::VertexGhostTrackState::clone

(

void

)

const [inline, private, virtual]

Implements reco::BasicGhostTrackState.

Definition at line 31 of file VertexGhostTrackState.h.

References VertexGhostTrackState().

        { return new VertexGhostTrackState(*this); }

GlobalPoint reco::VertexGhostTrackState::globalPosition

(

)

const [inline, virtual]

Implements reco::BasicGhostTrackState.

Definition at line 21 of file VertexGhostTrackState.h.

References position_.

{ return position_; }

BasicGhostTrackState::Vertex VertexGhostTrackState::vertexStateOnGhostTrack	(	const GhostTrackPrediction &	pred,
		bool	withMeasurementError
	)		const [virtual]

Implements reco::BasicGhostTrackState.

Definition at line 37 of file VertexGhostTrackState.cc.

References b, reco::GhostTrackPrediction::cartesianError(), conv, covariance_, reco::GhostTrackPrediction::direction(), error, reco::BasicGhostTrackState::lambda(), reco::GhostTrackPrediction::origin(), pos, position_, rho, reco::GhostTrackPrediction::rho2(), and mathSSE::sqrt().

{
        using namespace ROOT::Math;

        GlobalPoint origin = pred.origin();
        GlobalVector direction = pred.direction();

        double rho2 = pred.rho2();
        double rho = std::sqrt(rho2);
        double lambda = (position_ - origin) * direction / rho2;
        GlobalPoint pos = origin + lambda * direction;

        Vector3 b = conv(direction) / rho;
        Vector3 ca = conv(position_ - pos);

        Matrix33 pA = TensorProd(b, b);
        Matrix33 pB = TensorProd(b, ca);

        Matrix36 jacobian;
        jacobian.Place_at(-pA + Matrix33(SMatrixIdentity()), 0, 0);
        jacobian.Place_at(pB / rho, 0, 3);
        Matrix3S error = Similarity(jacobian, pred.cartesianError(lambda));

        if (withMeasurementError)
                error += Similarity(pA, covariance_);

        return Vertex(pos, error);
}

BasicGhostTrackState::Vertex VertexGhostTrackState::vertexStateOnMeasurement	(	const GhostTrackPrediction &	pred,
		bool	withGhostTrackError
	)		const [virtual]

Implements reco::BasicGhostTrackState.

Definition at line 67 of file VertexGhostTrackState.cc.

References covariance_, and position_.

{
        return Vertex(position_, covariance_);
}

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Member Data Documentation

CovarianceMatrix reco::VertexGhostTrackState::covariance_ [private]

Definition at line 35 of file VertexGhostTrackState.h.

Referenced by cartesianCovariance(), cartesianError(), vertexStateOnGhostTrack(), and vertexStateOnMeasurement().

GlobalPoint reco::VertexGhostTrackState::position_ [private]

Definition at line 34 of file VertexGhostTrackState.h.

Referenced by globalPosition(), vertexStateOnGhostTrack(), and vertexStateOnMeasurement().