reco::TrackGhostTrackState Class Reference

#include <TrackGhostTrackState.h>

Inheritance diagram for reco::TrackGhostTrackState:

Public Member Functions
CovarianceMatrix	cartesianCovariance () const
GlobalError	cartesianError () const
GlobalPoint	globalPosition () const
bool	isValid () const
bool	linearize (const GhostTrackPrediction &pred, bool initial, double lambda)
bool	linearize (const GhostTrackPrediction &pred, double lambda)
void	reset ()
const TransientTrack &	track () const
	TrackGhostTrackState (const TransientTrack &track)
const TrajectoryStateOnSurface &	tsos () const
Vertex	vertexStateOnGhostTrack (const GhostTrackPrediction &pred, bool withMeasurementError) const
Vertex	vertexStateOnMeasurement (const GhostTrackPrediction &pred, bool withGhostTrackError) const
Public Member Functions inherited from reco::BasicGhostTrackState
	BasicGhostTrackState ()
double	lambda () const
void	setWeight (double weight)
double	weight () const
virtual	~BasicGhostTrackState ()
Public Member Functions inherited from BasicReferenceCounted
void	addReference () const
	BasicReferenceCounted ()
	BasicReferenceCounted (const BasicReferenceCounted &iRHS)
const BasicReferenceCounted &	operator= (const BasicReferenceCounted &)
unsigned int	references () const
void	removeReference () const
virtual	~BasicReferenceCounted ()

Private Member Functions
BasicGhostTrackState *	clone () const

Private Attributes
TransientTrack	track_
TrajectoryStateOnSurface	tsos_

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 19 of file TrackGhostTrackState.h.

Constructor & Destructor Documentation

reco::TrackGhostTrackState::TrackGhostTrackState ( const TransientTrack &  track )

inline

Definition at line 21 of file TrackGhostTrackState.h.

Referenced by clone().

: track_(track) {}

Member Function Documentation

CovarianceMatrix reco::TrackGhostTrackState::cartesianCovariance ( ) const

inlinevirtual

Implements reco::BasicGhostTrackState.

Definition at line 32 of file TrackGhostTrackState.h.

References TrajectoryStateOnSurface::cartesianError(), CartesianTrajectoryError::matrix(), and tsos_.

    { return tsos_.cartesianError().matrix().Sub<CovarianceMatrix>(0, 0); }

GlobalError reco::TrackGhostTrackState::cartesianError ( ) const

inlinevirtual

Implements reco::BasicGhostTrackState.

Definition at line 30 of file TrackGhostTrackState.h.

References TrajectoryStateOnSurface::cartesianError(), CartesianTrajectoryError::position(), and tsos_.

    { return tsos_.cartesianError().position(); }

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

inlineprivatevirtual

Implements reco::BasicGhostTrackState.

Definition at line 46 of file TrackGhostTrackState.h.

References TrackGhostTrackState().

    { return new TrackGhostTrackState(*this); }

GlobalPoint reco::TrackGhostTrackState::globalPosition ( ) const

inlinevirtual

Implements reco::BasicGhostTrackState.

Definition at line 28 of file TrackGhostTrackState.h.

References TrajectoryStateOnSurface::globalPosition(), and tsos_.

    { return tsos_.globalPosition(); }

bool reco::TrackGhostTrackState::isValid ( void  ) const

inlinevirtual

Reimplemented from reco::BasicGhostTrackState.

Definition at line 26 of file TrackGhostTrackState.h.

References TrajectoryStateOnSurface::isValid(), and tsos_.

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

{ return tsos_.isValid(); }

bool TrackGhostTrackState::linearize ( const GhostTrackPrediction &  pred, bool  initial, double  lambda  )

virtual

Reimplemented from reco::BasicGhostTrackState.

Definition at line 44 of file TrackGhostTrackState.cc.

References reco::GhostTrackPrediction::direction(), reco::TransientTrack::field(), TrajectoryStateOnSurface::globalPosition(), reco::TransientTrack::impactPointState(), isValid(), reco::BasicGhostTrackState::lambda_, geometryCSVtoXML::line, reco::GhostTrackPrediction::origin(), reco::GhostTrackPrediction::rho2(), track_, and tsos_.

{
    AnalyticalTrajectoryExtrapolatorToLine extrap(track_.field());

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

    if (isValid() && !initial) {
        GlobalPoint pca = origin + lambda_ * direction;
        Line line(pca, direction);
        tsos_ = extrap.extrapolate(tsos_, line);
    } else {
        GlobalPoint pca = origin + lambda * direction;
        Line line(pca, direction);
        tsos_ = extrap.extrapolate(track_.impactPointState(), line);
    }

    if (!isValid())
        return false;

    lambda_ = (tsos_.globalPosition() - origin) * direction / pred.rho2();

    return true;
}

bool TrackGhostTrackState::linearize ( const GhostTrackPrediction &  pred, double  lambda  )

virtual

Reimplemented from reco::BasicGhostTrackState.

Definition at line 70 of file TrackGhostTrackState.cc.

References reco::TransientTrack::field(), reco::TransientTrack::impactPointState(), isValid(), reco::BasicGhostTrackState::lambda(), reco::BasicGhostTrackState::lambda_, point, reco::GhostTrackPrediction::position(), track_, and tsos_.

{
    AnalyticalImpactPointExtrapolator extrap(track_.field());

    GlobalPoint point = pred.position(lambda);

    tsos_ = extrap.extrapolate(track_.impactPointState(), point);
    if (!isValid())
        return false;

    lambda_ = lambda;

    return true;
}

void reco::TrackGhostTrackState::reset ( void  )

inlinevirtual

Reimplemented from reco::BasicGhostTrackState.

Definition at line 35 of file TrackGhostTrackState.h.

References tsos_.

{ tsos_ = TrajectoryStateOnSurface(); }

const TransientTrack& reco::TrackGhostTrackState::track ( void  ) const

inline

Definition at line 23 of file TrackGhostTrackState.h.

References track_.

Referenced by reco::GhostTrackState::track().

{ return track_; }

const TrajectoryStateOnSurface& reco::TrackGhostTrackState::tsos ( ) const

inline

Definition at line 24 of file TrackGhostTrackState.h.

References tsos_.

Referenced by reco::GhostTrackState::tsos().

{ return tsos_; }

BasicGhostTrackState::Vertex TrackGhostTrackState::vertexStateOnGhostTrack ( const GhostTrackPrediction &  pred, bool  withMeasurementError  ) const

virtual

Implements reco::BasicGhostTrackState.

Definition at line 86 of file TrackGhostTrackState.cc.

References b, reco::GhostTrackPrediction::cartesianError(), TrajectoryStateOnSurface::cartesianError(), conv, reco::GhostTrackPrediction::direction(), relativeConstraints::error, g, TrajectoryStateOnSurface::globalMomentum(), TrajectoryStateOnSurface::globalPosition(), isValid(), prof2calltree::l, reco::BasicGhostTrackState::lambda(), PV3DBase< T, PVType, FrameType >::mag(), CartesianTrajectoryError::matrix(), reco::GhostTrackPrediction::origin(), rho, reco::GhostTrackPrediction::rho2(), funct::sqr(), mathSSE::sqrt(), and tsos_.

{
    using namespace ROOT::Math;

    if (!isValid())
        return Vertex();

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

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

    GlobalVector momentum = tsos_.globalMomentum();
    double mom = momentum.mag();

    Vector3 b = conv(direction) / rho;
    Vector3 d = conv(momentum) / mom;
    double l = Dot(b, d);
    double g = 1. / (1. - sqr(l));

    Vector3 ca = conv(pos - tsos_.globalPosition());
    Vector3 bd = b - l * d;
    b *= g;

    Matrix33 pA = TensorProd(b, bd);
    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) {
        jacobian.Place_at(pA, 0, 0);
        jacobian.Place_at(-pB / mom, 0, 3);
        error += Similarity(jacobian, tsos_.cartesianError().matrix());
    }

    return Vertex(pos, error);
}

BasicGhostTrackState::Vertex TrackGhostTrackState::vertexStateOnMeasurement ( const GhostTrackPrediction &  pred, bool  withGhostTrackError  ) const

virtual

Implements reco::BasicGhostTrackState.

Definition at line 131 of file TrackGhostTrackState.cc.

References b, reco::GhostTrackPrediction::cartesianError(), TrajectoryStateOnSurface::cartesianError(), conv, reco::GhostTrackPrediction::direction(), relativeConstraints::error, g, TrajectoryStateOnSurface::globalMomentum(), TrajectoryStateOnSurface::globalPosition(), isValid(), prof2calltree::l, reco::BasicGhostTrackState::lambda(), PV3DBase< T, PVType, FrameType >::mag(), CartesianTrajectoryError::matrix(), reco::GhostTrackPrediction::origin(), rho, reco::GhostTrackPrediction::rho2(), funct::sqr(), mathSSE::sqrt(), and tsos_.

{
    using namespace ROOT::Math;

    if (!isValid())
        return Vertex();

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

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

    GlobalVector momentum = tsos_.globalMomentum();
    double mom = momentum.mag();

    Vector3 b = conv(direction) / rho;
    Vector3 d = conv(momentum) / mom;
    double l = Dot(b, d);
    double g = 1. / (1. - sqr(l));

    Vector3 ca = conv(tsos_.globalPosition() - pos);
    Vector3 bd = l * b - d;
    d *= g;

    Matrix33 pC = TensorProd(d, bd);
    Matrix33 pD = TensorProd(d, ca);

    Matrix36 jacobian;
    jacobian.Place_at(pC + Matrix33(SMatrixIdentity()), 0, 0);
    jacobian.Place_at(pD / mom, 0, 3);
    Matrix3S error = Similarity(jacobian, tsos_.cartesianError().matrix());

    if (withGhostTrackError) {
        jacobian.Place_at(-pC, 0, 0);
        jacobian.Place_at(-pD / rho, 0, 3);
        error += Similarity(jacobian, pred.cartesianError(lambda));
    }

    return Vertex(tsos_.globalPosition(), error);
}

Member Data Documentation

TransientTrack reco::TrackGhostTrackState::track_

private

Definition at line 50 of file TrackGhostTrackState.h.

Referenced by linearize(), and track().

TrajectoryStateOnSurface reco::TrackGhostTrackState::tsos_

private

Definition at line 49 of file TrackGhostTrackState.h.

Referenced by cartesianCovariance(), cartesianError(), globalPosition(), isValid(), linearize(), reset(), tsos(), vertexStateOnGhostTrack(), and vertexStateOnMeasurement().