reco::VertexGhostTrackState Class Reference

#include <VertexGhostTrackState.h>

Inheritance diagram for reco::VertexGhostTrackState:

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
Public Member Functions inherited from reco::BasicGhostTrackState
	BasicGhostTrackState ()
virtual bool	isValid () const
double	lambda () const
virtual bool	linearize (const GhostTrackPrediction &pred, bool initial, double lambda)
virtual bool	linearize (const GhostTrackPrediction &pred, double lambda)
virtual void	reset ()
void	setWeight (double weight)
double	weight () const
virtual	~BasicGhostTrackState ()
Public Member Functions inherited from BasicReferenceCounted
void	addReference () const
	BasicReferenceCounted ()
	BasicReferenceCounted (const BasicReferenceCounted &)
const BasicReferenceCounted &	operator= (const BasicReferenceCounted &)
unsigned int	references () const
void	removeReference () const
virtual	~BasicReferenceCounted ()

Private Member Functions
BasicGhostTrackState *	clone () const

Private Attributes
CovarianceMatrix	covariance_
GlobalPoint	position_

Additional Inherited Members
Public Types inherited from reco::BasicGhostTrackState
typedef BasicGhostTrackState	BGTS
typedef math::Error< 3 >::type	CovarianceMatrix
typedef ProxyBase< BGTS, CopyUsingClone< BGTS > >	Proxy
typedef std::pair< GlobalPoint, GlobalError >	Vertex
Protected Attributes inherited from reco::BasicGhostTrackState
double	lambda_
double	weight_

Detailed Description

Definition at line 15 of file VertexGhostTrackState.h.

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) {}

Member Function Documentation

CovarianceMatrix reco::VertexGhostTrackState::cartesianCovariance ( ) const

inlinevirtual

Implements reco::BasicGhostTrackState.

Definition at line 23 of file VertexGhostTrackState.h.

References covariance_.

{ return covariance_; }

GlobalError reco::VertexGhostTrackState::cartesianError ( ) const

inlinevirtual

Implements reco::BasicGhostTrackState.

Definition at line 22 of file VertexGhostTrackState.h.

References covariance_.

{ return covariance_; }

BasicGhostTrackState* reco::VertexGhostTrackState::clone ( void  ) const

inlineprivatevirtual

Implements reco::BasicGhostTrackState.

Definition at line 31 of file VertexGhostTrackState.h.

References VertexGhostTrackState().

    { return new VertexGhostTrackState(*this); }

GlobalPoint reco::VertexGhostTrackState::globalPosition ( ) const

inlinevirtual

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 38 of file VertexGhostTrackState.cc.

References b, reco::GhostTrackPrediction::cartesianError(), conv, covariance_, reco::GhostTrackPrediction::direction(), relativeConstraints::error, reco::BasicGhostTrackState::lambda(), reco::GhostTrackPrediction::origin(), position_, 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 68 of file VertexGhostTrackState.cc.

References covariance_, and position_.

{
    return Vertex(position_, covariance_);
}

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().