LocalTrajectoryParameters Class Reference

#include <LocalTrajectoryParameters.h>

Public Member Functions
float	absdz () const
TrackCharge	charge () const
	Charge (-1, 0 or 1) More...
LocalVector	direction () const
	Momentum vector unit in the local frame. More...
float	dxdz () const
float	dydz () const
	LocalTrajectoryParameters ()
	LocalTrajectoryParameters (const AlgebraicVector5 &v, float aPzSign, bool charged=true)
	LocalTrajectoryParameters (float aQbp, float aDxdz, float aDydz, float aX, float aY, float aPzSign, bool charged=true)
	LocalTrajectoryParameters (const LocalPoint &pos, const LocalVector &p, TrackCharge charge)
	Constructor from local position, momentum and charge. More...
AlgebraicVector5	mixedFormatVector () const
LocalVector	momentum () const
	Momentum vector in the local frame. More...
LocalPoint	position () const
	Local x and y position coordinates. More...
float	pzSign () const
	Sign of the z-component of the momentum in the local frame. More...
float	qbp () const
float	signedInverseMomentum () const
	Signed inverse momentum q/p (zero for neutrals). More...
bool	updateP (float dP)
	Update of momentum by a scalar dP. More...
AlgebraicVector5	vector () const

Private Attributes
short	theCharge
	charge More...
float	theDxdz
	tangent of direction in local x vs. z More...
float	theDydz
	tangent of direction in local y vs. z More...
short	thePzSign
	sign of local pz More...
float	theQbp
	q/p (charged) or 1/p (neutral) More...
float	theX
	local x position More...
float	theY
	local y position More...

Detailed Description

Class providing access to a set of relevant parameters of a trajectory in a local, Cartesian frame. The set consists of the following parameters:

q/p : charged particles: charge (plus or minus one) divided by magnitude of momentum
neutral particles: inverse magnitude of momentum
dxdz : direction tangent in local xz-plane
dydz : direction tangent in local yz-plane
x : local x-coordinate
y : local y-coordinate

In addition, the sign of local p_z is needed to fully define the direction of the track in this local frame.

Definition at line 25 of file LocalTrajectoryParameters.h.

Constructor & Destructor Documentation

LocalTrajectoryParameters::LocalTrajectoryParameters ( )

inline

Definition at line 29 of file LocalTrajectoryParameters.h.

{}

LocalTrajectoryParameters::LocalTrajectoryParameters ( const AlgebraicVector5 &  v, float  aPzSign, bool  charged = true  )

inline

Constructor from vector of parameters.

Expects a vector of parameters as defined above, plus the sign of p_z. For charged particles the charge will be determined by the sign of the first element. For neutral particles the last argument should be false, in which case the charge of the first element will be neglected.

Definition at line 38 of file LocalTrajectoryParameters.h.

References theCharge, theDxdz, theDydz, thePzSign, theQbp, theX, and theY.

                                                                                           {
    theQbp  = v[0];
    theDxdz = v[1];
    theDydz = v[2];
    theX    = v[3];
    theY    = v[4];
    thePzSign = aPzSign;
    if ( charged )
      theCharge = theQbp>0 ? 1 : -1;
    else
      theCharge = 0;
  }

LocalTrajectoryParameters::LocalTrajectoryParameters ( float  aQbp, float  aDxdz, float  aDydz, float  aX, float  aY, float  aPzSign, bool  charged = true  )

inline

Constructor from individual parameters.

Expects parameters as defined above, plus the sign of p_z. For charged particles the charge will be determined by the sign of the first argument. For neutral particles the last argument should be false, in which case the charge of the first argument will be neglected.

Definition at line 59 of file LocalTrajectoryParameters.h.

References theCharge, and theQbp.

                                                                                    :
    theDxdz(aDxdz), theDydz(aDydz),
    theX(aX), theY(aY), thePzSign(aPzSign>0 ? 1 : -1) {
    if ( charged ) {
      theQbp = aQbp;
      theCharge = theQbp>0 ? 1 : -1;
    }
    else {
      theQbp = aQbp;
      theCharge = 0;
    }
  }

LocalTrajectoryParameters::LocalTrajectoryParameters ( const LocalPoint &  pos, const LocalVector &  p, TrackCharge  charge  )

inline

Constructor from local position, momentum and charge.

Definition at line 74 of file LocalTrajectoryParameters.h.

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

                                     :
    theQbp( charge/p.mag()), theDxdz( p.x()/p.z()), theDydz( p.y()/p.z()), 
    theX( pos.x()), theY(pos.y()), thePzSign( p.z()>0. ? 1:-1), theCharge(charge) {
    if ( charge==0 )  theQbp = 1.f/p.mag();
  }

Member Function Documentation

float LocalTrajectoryParameters::absdz ( ) const

inline

Definition at line 163 of file LocalTrajectoryParameters.h.

References f, mathSSE::sqrt(), theDxdz, and theDydz.

Referenced by siStripClusterTools::chargePerCM().

{ return 1.f/std::sqrt(1.f + theDxdz*theDxdz + theDydz*theDydz); }

TrackCharge LocalTrajectoryParameters::charge ( ) const

inline

Charge (-1, 0 or 1)

Definition at line 108 of file LocalTrajectoryParameters.h.

References theCharge.

Referenced by TrackerSeedValidator::analyze(), BzeroReferenceTrajectory::BzeroReferenceTrajectory(), display_seed(), reco::ElectronSeed::getCharge(), JacobianCartesianToLocal::JacobianCartesianToLocal(), JacobianLocalToCartesian::JacobianLocalToCartesian(), operator<<(), PrintRecoObjects::print(), FakeTrackProducer< T >::produce(), signedInverseMomentum(), and InOutConversionTrackFinder::tracks().

{return theCharge;}

LocalVector LocalTrajectoryParameters::direction ( ) const

inline

Momentum vector unit in the local frame.

Definition at line 99 of file LocalTrajectoryParameters.h.

References f, mathSSE::sqrt(), theDxdz, theDydz, and thePzSign.

Referenced by JacobianCurvilinearToLocal::JacobianCurvilinearToLocal(), and JacobianLocalToCurvilinear::JacobianLocalToCurvilinear().

                                {
    float dz = float(thePzSign)/std::sqrt(1.f + theDxdz*theDxdz + theDydz*theDydz);
    float dx = dz*theDxdz;
    float dy = dz*theDydz;
    return LocalVector(dx, dy, dz);
  }

float LocalTrajectoryParameters::dxdz ( ) const

inline

Definition at line 161 of file LocalTrajectoryParameters.h.

References theDxdz.

Referenced by TrackCandidateProducer::isDuplicateCandidate(), and JacobianLocalToCartesian::JacobianLocalToCartesian().

{ return theDxdz;}

float LocalTrajectoryParameters::dydz ( ) const

inline

Definition at line 162 of file LocalTrajectoryParameters.h.

References theDydz.

Referenced by JacobianLocalToCartesian::JacobianLocalToCartesian().

{ return theDydz;}

AlgebraicVector5 LocalTrajectoryParameters::mixedFormatVector ( ) const

inline

Vector of parameters in internal representation.

Vector of parameters as defined above, with the first element = q/p for charged and = 1/p for neutral.

Definition at line 135 of file LocalTrajectoryParameters.h.

References theDxdz, theDydz, theQbp, theX, theY, and findQualityFiles::v.

Referenced by BzeroReferenceTrajectory::BzeroReferenceTrajectory(), PixelCPEBase::computeAnglesFromTrajectory(), SiStripBackplaneCalibration::derivatives(), TwoBowedSurfacesAlignmentParameters::derivatives(), DualBzeroReferenceTrajectory::extractParameters(), DualReferenceTrajectory::extractParameters(), MuonKinkFinder::getChi2(), MatcherUsingTracksAlgorithm::getChi2(), SegmentAlignmentDerivatives4D::operator()(), KarimakiAlignmentDerivatives::operator()(), BowedSurfaceAlignmentDerivatives::operator()(), operator<<(), and ReferenceTrajectory::ReferenceTrajectory().

                                             {
    AlgebraicVector5 v;
    v[0] = theQbp;    // signed in case of charged particles, 1/p for neutrals
    v[1] = theDxdz;
    v[2] = theDydz;
    v[3] = theX;
    v[4] = theY;
    return v;
  }

LocalVector LocalTrajectoryParameters::momentum ( ) const

inline

Momentum vector in the local frame.

Definition at line 89 of file LocalTrajectoryParameters.h.

References funct::abs(), alignCSCRings::e, f, mathSSE::sqrt(), theDxdz, theDydz, thePzSign, and theQbp.

Referenced by SiPixelTrackResidualSource::analyze(), SiPixelErrorEstimation::analyze(), MuonSeedSimpleCleaner::checkPt(), PixelCPEBase::computeAnglesFromTrajectory(), TwoBodyDecayTrajectory::constructSingleTsosWithErrors(), display_seed(), SiPixelHitEfficiencyModule::fill(), JacobianCartesianToLocal::JacobianCartesianToLocal(), BasicTrajectoryState::localMomentum(), StripCPEgeometric::localParameters(), StripCPEfromTemplate::localParameters(), StripCPEfromTrackAngle::localParameters(), reco::TrackInfo::localTrackMomentum(), PrintRecoObjects::print(), TrackCandidateProducer::produce(), KalmanAlignmentTrackRefitter::refitSingleTracklet(), TrackInfoProducerAlgorithm::run(), TrackClusterSplitter::splitCluster(), and InOutConversionTrackFinder::tracks().

                               {
    float op = std::abs(theQbp);
    if ( op<1.e-9f )  op = 1.e-9f;
    float pz = float(thePzSign)/(op*std::sqrt(1.f + theDxdz*theDxdz + theDydz*theDydz));
    float px = pz*theDxdz;
    float py = pz*theDydz;
    return LocalVector(px, py, pz);
  }

LocalPoint LocalTrajectoryParameters::position ( ) const

inline

Local x and y position coordinates.

Definition at line 84 of file LocalTrajectoryParameters.h.

References theX, and theY.

Referenced by PixelCPEBase::computeAnglesFromTrajectory(), OutInConversionSeedFinder::createSeed(), display_seed(), SiPixelHitEfficiencyModule::fill(), KFTrajectoryFitter::fitOne(), ConversionSeedFilter::getTSOS(), JacobianCurvilinearToLocal::JacobianCurvilinearToLocal(), JacobianLocalToCurvilinear::JacobianLocalToCurvilinear(), StripCPEgeometric::localParameters(), StripCPEfromTemplate::localParameters(), StripCPEfromTrackAngle::localParameters(), BasicTrajectoryState::localPosition(), reco::TrackInfo::localTrackPosition(), TrackInfoProducerAlgorithm::run(), and InOutConversionTrackFinder::tracks().

                              {
    return LocalPoint(theX, theY);
  }

float LocalTrajectoryParameters::pzSign ( ) const

inline

Sign of the z-component of the momentum in the local frame.

Definition at line 146 of file LocalTrajectoryParameters.h.

References thePzSign.

Referenced by BzeroReferenceTrajectory::BzeroReferenceTrajectory(), TrajectoryStateCombiner::combine(), JacobianLocalToCartesian::JacobianLocalToCartesian(), GlobalTrackerMuonAlignment::misalignMuonL(), MultiTrajectoryStateMode::momentumFromModeLocal(), GsfTrackProducerBase::putInEvt(), GaussianStateConversions::tsosFromMultiGaussianState(), MultiGaussianStateTransform::tsosFromSingleState(), and KFStrip1DUpdator::update().

                       {
    return thePzSign;
  }

float LocalTrajectoryParameters::qbp ( ) const

inline

Definition at line 160 of file LocalTrajectoryParameters.h.

References theQbp.

Referenced by KFTrajectoryFitter::fitOne(), TrackCandidateProducer::isDuplicateCandidate(), and JacobianLocalToCartesian::JacobianLocalToCartesian().

{ return theQbp;}

float LocalTrajectoryParameters::signedInverseMomentum ( ) const

inline

Signed inverse momentum q/p (zero for neutrals).

Definition at line 111 of file LocalTrajectoryParameters.h.

References charge(), and theQbp.

Referenced by ReferenceTrajectory::construct(), TwoBodyDecayTrajectory::constructSingleTsosWithErrors(), JacobianCurvilinearToLocal::JacobianCurvilinearToLocal(), JacobianLocalToCurvilinear::JacobianLocalToCurvilinear(), NuclearInteractionFinder::rescaleError(), and vector().

                                      {
    return charge()==0 ? 0.f : theQbp;
  }

bool LocalTrajectoryParameters::updateP ( float  dP )

inline

Update of momentum by a scalar dP.

Definition at line 151 of file LocalTrajectoryParameters.h.

References funct::abs(), f, AlCaHLTBitMon_ParallelJobs::p, and theQbp.

Referenced by GsfMaterialEffectsUpdator::updateState(), VolumeMaterialEffectsUpdator::updateState(), and MaterialEffectsUpdator::updateStateInPlace().

                         {
    float p = 1.f/std::abs(theQbp);
    if ((p += dP) <= 0.f) return false;
    float newQbp = theQbp > 0. ? 1.f/p : -1.f/p;
    theQbp = newQbp;
    return true;
  }

AlgebraicVector5 LocalTrajectoryParameters::vector ( ) const

inline

Vector of parameters with signed inverse momentum.

Vector of parameters as defined above, with the first element = q/p .

Definition at line 120 of file LocalTrajectoryParameters.h.

References signedInverseMomentum(), theDxdz, theDydz, theX, theY, and findQualityFiles::v.

Referenced by GlobalTrackerMuonAlignment::analyzeTrackTrack(), GlobalTrackerMuonAlignment::analyzeTrackTrajectory(), CollinearFitAtTM2::CollinearFitAtTM2(), TrajectoryStateCombiner::combine(), GsfTrackProducerBase::computeModeAtTM(), PFGsfHelper::computeQpMode(), GlobalTrackerMuonAlignment::debugTrajectorySOS(), GlobalTrackerMuonAlignment::debugTrajectorySOSv(), CollinearFitAtTM::fit(), StripCPEgeometric::localParameters(), StripCPEfromTemplate::localParameters(), StripCPEfromTrackAngle::localParameters(), GsfTrackProducerBase::localParametersFromQpMode(), GlobalMuonTrackMatcher::match_Chi2(), MeasurementExtractor::measuredParameters(), GlobalTrackerMuonAlignment::misalignMuonL(), TRecHit5DParamConstraint::parameters(), TrackCandidateProducer::produce(), TrackAssociatorByPosition::quality(), ChargeSignificanceTrajectoryFilter::TBC(), CkfDebugger::testSeed(), Strip1DMeasurementTransformator::trajectoryParameters(), Tsos2DPhi::Tsos2DPhi(), Tsos2DZed::Tsos2DZed(), and Tsos4D::Tsos4D().

                                  {
    AlgebraicVector5 v;
    v[0] = signedInverseMomentum();
    v[1] = theDxdz;
    v[2] = theDydz;
    v[3] = theX;
    v[4] = theY;
    return v;
  }

Member Data Documentation

short LocalTrajectoryParameters::theCharge

private

charge

Definition at line 175 of file LocalTrajectoryParameters.h.

Referenced by charge(), and LocalTrajectoryParameters().

float LocalTrajectoryParameters::theDxdz

private

tangent of direction in local x vs. z

Definition at line 168 of file LocalTrajectoryParameters.h.

Referenced by absdz(), direction(), dxdz(), LocalTrajectoryParameters(), mixedFormatVector(), momentum(), and vector().

float LocalTrajectoryParameters::theDydz

private

tangent of direction in local y vs. z

Definition at line 169 of file LocalTrajectoryParameters.h.

Referenced by absdz(), direction(), dydz(), LocalTrajectoryParameters(), mixedFormatVector(), momentum(), and vector().

short LocalTrajectoryParameters::thePzSign

private

sign of local pz

Definition at line 173 of file LocalTrajectoryParameters.h.

Referenced by direction(), LocalTrajectoryParameters(), momentum(), and pzSign().

float LocalTrajectoryParameters::theQbp

private

q/p (charged) or 1/p (neutral)

Definition at line 167 of file LocalTrajectoryParameters.h.

Referenced by LocalTrajectoryParameters(), mixedFormatVector(), momentum(), qbp(), signedInverseMomentum(), and updateP().

float LocalTrajectoryParameters::theX

private

local x position

Definition at line 170 of file LocalTrajectoryParameters.h.

Referenced by LocalTrajectoryParameters(), mixedFormatVector(), position(), and vector().

float LocalTrajectoryParameters::theY

private

local y position

Definition at line 171 of file LocalTrajectoryParameters.h.

Referenced by LocalTrajectoryParameters(), mixedFormatVector(), position(), and vector().