GlobalTrajectoryParameters Class Reference

#include <GlobalTrajectoryParameters.h>

Public Member Functions
TrackCharge	charge () const
GlobalVector	direction () const
	GlobalTrajectoryParameters ()
	GlobalTrajectoryParameters (const GlobalPoint &aX, const GlobalVector &aP, TrackCharge aCharge, const MagneticField *fieldProvider)
	GlobalTrajectoryParameters (const GlobalPoint &aX, const GlobalVector &direction, float transverseCurvature, int, const MagneticField *fieldProvider)
const MagneticField &	magneticField () const
GlobalVector	magneticFieldInInverseGeV (const GlobalPoint &x) const
GlobalVector	magneticFieldInInverseGeV () const
GlobalVector	momentum () const
GlobalPoint	position () const
float	signedInverseMomentum () const
float	signedInverseTransverseMomentum () const
float	transverseCurvature () const
AlgebraicVector6	vector () const

Private Attributes
GlobalVector	cachedMagneticField
signed char	theCharge
const MagneticField *	theField
GlobalVector	theP
GlobalPoint	theX

Detailed Description

Class providing access to a set of relevant parameters of a trajectory in the global, Cartesian frame. The basic data members used to calculate these parameters are the charge and global position and momentum.

Definition at line 15 of file GlobalTrajectoryParameters.h.

Constructor & Destructor Documentation

GlobalTrajectoryParameters::GlobalTrajectoryParameters ( )

inline

Definition at line 18 of file GlobalTrajectoryParameters.h.

                               :
    theField(0), 
    theX(), theP(), 
    theCharge(0)
  {}  // we must initialize cache to non-NAN to avoid FPE

GlobalTrajectoryParameters::GlobalTrajectoryParameters	(	const GlobalPoint &	aX,
		const GlobalVector &	aP,
		TrackCharge	aCharge,
		const MagneticField *	fieldProvider
	)

Constructing class from global position, global momentum and charge.

Definition at line 19 of file GlobalTrajectoryParameters.cc.

References cachedMagneticField, MagneticField::inTesla(), theField, and theX.

                                                                :
  theField(fieldProvider),
  theX(aX), theP(aP),     
  theCharge(aCharge)
{
    cachedMagneticField = theField ? theField->inTesla(theX) : GlobalVector(0, 0, 0);
} // we must initialize cache to non-NAN to avoid FPE

GlobalTrajectoryParameters::GlobalTrajectoryParameters	(	const GlobalPoint &	aX,
		const GlobalVector &	direction,
		float	transverseCurvature,
		int	,
		const MagneticField *	fieldProvider
	)

Constructing class from global position, direction (unit length) and transverse curvature. The fourth int argument is dummy, it serves only to distinguish this constructor from the one above.

Definition at line 5 of file GlobalTrajectoryParameters.cc.

References funct::abs(), cachedMagneticField, f, MagneticField::inTesla(), PV3DBase< T, PVType, FrameType >::perp(), theCharge, theField, theP, theX, transverseCurvature(), and PV3DBase< T, PVType, FrameType >::z().

                                                                   :
  theField(fieldProvider),
  theX(aX)
{
  cachedMagneticField = theField->inTesla(theX);
  float bza = -2.99792458e-3f * cachedMagneticField.z();
  float qbpi = bza/(direction.perp()*transverseCurvature);
  theP = direction*std::abs(qbpi);
  theCharge = qbpi > 0.f ? 1 : -1;
}

Member Function Documentation

TrackCharge GlobalTrajectoryParameters::charge ( void  ) const

inline

Charge q of particle, either +1 or -1.

Definition at line 63 of file GlobalTrajectoryParameters.h.

References theCharge.

Referenced by TwoTrackMinimumDistanceLineLine::calculate(), FreeTrajectoryState::charge(), MuonPatternRecoDumper::dumpFTS(), SeedForPhotonConversion1Leg::initialKinematic(), SeedFromConsecutiveHitsCreator::initialKinematic(), SeedForPhotonConversionFromQuadruplets::initialKinematic(), JacobianCartesianToCurvilinear::JacobianCartesianToCurvilinear(), JacobianCurvilinearToCartesian::JacobianCurvilinearToCartesian(), ConvBremSeedProducer::produce(), TangentApproachInRPhi::trajectoryParameters(), and TwoTrackMinimumDistanceHelixHelix::updateCoeffs().

                             {
    return theCharge;
  }

GlobalVector GlobalTrajectoryParameters::direction ( ) const

inline

Definition at line 56 of file GlobalTrajectoryParameters.h.

References theP, and Vector3DBase< T, FrameTag >::unit().

                                 {
    return theP.unit();
  }

const MagneticField& GlobalTrajectoryParameters::magneticField ( ) const

inline

Definition at line 111 of file GlobalTrajectoryParameters.h.

References theField.

Referenced by TangentApproachInRPhi::calculate(), TwoTrackMinimumDistanceLineLine::calculate(), TrajectoryStateCombiner::combine(), fastProp(), SeedForPhotonConversion1Leg::initialKinematic(), SeedForPhotonConversionFromQuadruplets::initialKinematic(), KinematicState::magneticField(), BasicTrajectoryState::magneticField(), TrajectoryStateWithArbitraryError::operator()(), RecHitPropagator::propagate(), NuclearInteractionFinder::rescaleError(), FreeTrajectoryState::rescaleError(), TangentApproachInRPhi::trajectoryParameters(), TrajectoryStateClosestToPoint::TrajectoryStateClosestToPoint(), PerigeeRefittedTrackState::trajectoryStateOnSurface(), GsfMultiStateUpdator::update(), TwoTrackMinimumDistanceHelixHelix::updateCoeffs(), GsfMaterialEffectsUpdator::updateState(), VolumeMaterialEffectsUpdator::updateState(), and MaterialEffectsUpdator::updateStateInPlace().

{return *theField;}

GlobalVector GlobalTrajectoryParameters::magneticFieldInInverseGeV

(

const GlobalPoint &

x

)

const

Definition at line 30 of file GlobalTrajectoryParameters.cc.

References f, MagneticField::inTesla(), and theField.

Referenced by ReferenceTrajectory::addMaterialEffectsBrl(), AnalyticalCurvilinearJacobian::AnalyticalCurvilinearJacobian(), PerigeeConversions::ftsToPerigeeParameters(), PerigeeConversions::jacobianCurvilinear2Perigee(), JacobianCurvilinearToLocal::JacobianCurvilinearToLocal(), JacobianLocalToCurvilinear::JacobianLocalToCurvilinear(), PerigeeConversions::jacobianPerigee2Curvilinear(), KinematicState::magneticFieldInInverseGeV(), and operator<<().

{
  return 2.99792458e-3f * theField->inTesla(x);
}

GlobalVector GlobalTrajectoryParameters::magneticFieldInInverseGeV ( ) const

inline

Definition at line 107 of file GlobalTrajectoryParameters.h.

References cachedMagneticField, and f.

                                                 {
    return 2.99792458e-3f * cachedMagneticField;
  }

GlobalVector GlobalTrajectoryParameters::momentum ( ) const

inline

Global momentum.

Definition at line 52 of file GlobalTrajectoryParameters.h.

References theP.

Referenced by ReferenceTrajectory::addMaterialEffectsBrl(), MuonTrackLoader::buildTrackExtra(), TwoTrackMinimumDistanceLineLine::calculate(), VZeroFinder::checkTrackPair(), PixelClusterShapeSeedComparitor::compatible(), AnalyticalCurvilinearJacobian::computeFullJacobian(), AnalyticalCurvilinearJacobian::computeInfinitesimalJacobian(), AnalyticalCurvilinearJacobian::computeStraightLineJacobian(), NuclearTrackCorrector::getNewTrackExtra(), SeedForPhotonConversion1Leg::initialKinematic(), SeedFromConsecutiveHitsCreator::initialKinematic(), SeedForPhotonConversionFromQuadruplets::initialKinematic(), JacobianCartesianToCurvilinear::JacobianCartesianToCurvilinear(), JacobianCurvilinearToCartesian::JacobianCurvilinearToCartesian(), JacobianCurvilinearToLocal::JacobianCurvilinearToLocal(), PerigeeConversions::jacobianPerigee2Curvilinear(), SeedFromConsecutiveHitsCreator::makeSeed(), FreeTrajectoryState::momentum(), AnalyticalErrorPropagation::operator()(), ConvBremSeedProducer::produce(), TrackingRecHitProjector< ResultingHit >::project(), KfTrackProducerBase::putInEvt(), GsfTrackProducerBase::putInEvt(), TrackProducerWithSCAssociation::putInEvt(), KalmanAlignmentTrackRefitter::refitSingleTracklet(), TangentApproachInRPhi::trajectoryParameters(), SeedForPhotonConversion1Leg::trajectorySeed(), and TwoTrackMinimumDistanceHelixHelix::updateCoeffs().

                                {
    return theP;
  }

GlobalPoint GlobalTrajectoryParameters::position ( ) const

inline

Global position.

Definition at line 45 of file GlobalTrajectoryParameters.h.

References theX.

Referenced by ReferenceTrajectory::addMaterialEffectsBrl(), MuonTrackLoader::buildTrackExtra(), TwoTrackMinimumDistanceHelixHelix::calculate(), TwoTrackMinimumDistanceLineLine::calculate(), PixelClusterShapeSeedComparitor::compatible(), PixelHitMatcher::compatibleSeeds(), AnalyticalCurvilinearJacobian::computeFullJacobian(), ConversionForwardEstimator::estimate(), ConversionBarrelEstimator::estimate(), ForwardMeasurementEstimator::estimate(), BarrelMeasurementEstimator::estimate(), AnalyticalImpactPointExtrapolator::extrapolateSingleState(), AnalyticalTrajectoryExtrapolatorToLine::extrapolateSingleState(), TwoTrackMinimumDistanceHelixHelix::finalPoints(), NuclearTrackCorrector::getNewTrackExtra(), SeedForPhotonConversion1Leg::initialKinematic(), SeedFromConsecutiveHitsCreator::initialKinematic(), SeedForPhotonConversionFromQuadruplets::initialKinematic(), AnalyticalErrorPropagation::operator()(), FreeTrajectoryState::position(), ConvBremSeedProducer::produce(), TauTagTools::propagTrackECALSurfContactPoint(), KfTrackProducerBase::putInEvt(), GsfTrackProducerBase::putInEvt(), TrackProducerWithSCAssociation::putInEvt(), TangentApproachInRPhi::trajectoryParameters(), and TwoTrackMinimumDistanceHelixHelix::updateCoeffs().

                               {
    return theX;
  }

float GlobalTrajectoryParameters::signedInverseMomentum ( ) const

inline

Charge divided by (magnitude of) momentum, i.e. q/p.

Definition at line 70 of file GlobalTrajectoryParameters.h.

References PV3DBase< T, PVType, FrameType >::mag(), theCharge, and theP.

Referenced by AnalyticalCurvilinearJacobian::computeFullJacobian(), AnalyticalCurvilinearJacobian::computeInfinitesimalJacobian(), PerigeeConversions::jacobianPerigee2Curvilinear(), and FreeTrajectoryState::signedInverseMomentum().

                                      {
    return theCharge/theP.mag();
  }

float GlobalTrajectoryParameters::signedInverseTransverseMomentum ( ) const

inline

Charge divided by transverse momentum, i.e. q/p_T.

Definition at line 77 of file GlobalTrajectoryParameters.h.

References PV3DBase< T, PVType, FrameType >::perp(), theCharge, and theP.

Referenced by transverseCurvature().

                                                {
    return theCharge/theP.perp();
  }

float GlobalTrajectoryParameters::transverseCurvature ( ) const

inline

Transverse curvature kappa (which is the inverse radius of curvature in the transverse plane) in cm^{-1}. Sign convention is such that positive kappa means counterclockwise rotation of the track with respect to the global z-axis.

Definition at line 86 of file GlobalTrajectoryParameters.h.

References cachedMagneticField, f, signedInverseTransverseMomentum(), and PV3DBase< T, PVType, FrameType >::z().

Referenced by AnalyticalCurvilinearJacobian::AnalyticalCurvilinearJacobian(), GlobalTrajectoryParameters(), SeedForPhotonConversion1Leg::initialKinematic(), SeedForPhotonConversionFromQuadruplets::initialKinematic(), PerigeeConversions::jacobianPerigee2Curvilinear(), and FreeTrajectoryState::transverseCurvature().

                                    {
    return -2.99792458e-3f * signedInverseTransverseMomentum() * cachedMagneticField.z();
  }

AlgebraicVector6 GlobalTrajectoryParameters::vector ( ) const

inline

Vector whose first three elements are the global position coordinates and whose last three elements are the global momentum coordinates.

Definition at line 94 of file GlobalTrajectoryParameters.h.

References theP, theX, PV3DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), and PV3DBase< T, PVType, FrameType >::z().

Referenced by GlobalTrackerMuonAlignment::debugTrajectorySOS(), GlobalTrackerMuonAlignment::debugTrajectorySOSv(), operator<<(), MinPtTrajectoryFilter::test(), and ThresholdPtTrajectoryFilter::test().

                                  {
    //AlgebraicVector6 v;
    //v[0] = theX.x();
    //v[1] = theX.y();
    //v[2] = theX.z();
    //v[3] = theP.x();
    //v[4] = theP.y();
    //v[5] = theP.z();
    return AlgebraicVector6(theX.x(),theX.y(),theX.z(),theP.x(),theP.y(),theP.z());
  }

Member Data Documentation

GlobalVector GlobalTrajectoryParameters::cachedMagneticField

private

Definition at line 118 of file GlobalTrajectoryParameters.h.

Referenced by GlobalTrajectoryParameters(), magneticFieldInInverseGeV(), and transverseCurvature().

signed char GlobalTrajectoryParameters::theCharge

private

Definition at line 119 of file GlobalTrajectoryParameters.h.

Referenced by charge(), GlobalTrajectoryParameters(), signedInverseMomentum(), and signedInverseTransverseMomentum().

const MagneticField* GlobalTrajectoryParameters::theField

private

Definition at line 115 of file GlobalTrajectoryParameters.h.

Referenced by GlobalTrajectoryParameters(), magneticField(), and magneticFieldInInverseGeV().

GlobalVector GlobalTrajectoryParameters::theP

private

Definition at line 117 of file GlobalTrajectoryParameters.h.

Referenced by direction(), GlobalTrajectoryParameters(), momentum(), signedInverseMomentum(), signedInverseTransverseMomentum(), and vector().

GlobalPoint GlobalTrajectoryParameters::theX

private

Definition at line 116 of file GlobalTrajectoryParameters.h.

Referenced by GlobalTrajectoryParameters(), position(), and vector().