CurvilinearTrajectoryError Class Reference

#include <CurvilinearTrajectoryError.h>

List of all members.

Public Types
enum	{ dimension = 5 }
	parameter dimension More...
typedef math::Error< dimension > ::type	MathCovarianceMatrix
	5 parameter covariance matrix
Public Member Functions
	CurvilinearTrajectoryError ()
	CurvilinearTrajectoryError (const AlgebraicSymMatrix55 &aCovarianceMatrix)
const AlgebraicSymMatrix55 &	matrix () const
	operator const MathCovarianceMatrix & () const
	operator MathCovarianceMatrix ()
void	operator*= (double factor)
void	zeroFieldScaling (double factor)
Private Attributes
AlgebraicSymMatrix55	theCovarianceMatrix

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Detailed Description

Parametrization of the error matrix in the curvilinear frame. This frame is tangent to the track at the point of definition, with Z_T parallel to the track. X_T is in the global xy plane and points to the left when looking into the direction of the track, and Y_T forms a right-handed frame with X_T and Z_T.

The error along Z_T is therefore zero. The parameters are
sigma^2( charge / abs_momentum)
sigma^2( lambda)
sigma^2( phi)
sigma^2( x_transverse))
sigma^2( y_transverse))

Please note that lambda and phi are defined in the global frame. Lambda is the helix dip angle (pi/2 minus theta (polar angle)), while phi is the angle of inclination with the global x-axis in the transverse (global xy) plane.

Definition at line 26 of file CurvilinearTrajectoryError.h.

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Member Typedef Documentation

typedef math::Error<dimension>::type CurvilinearTrajectoryError::MathCovarianceMatrix

5 parameter covariance matrix

Definition at line 32 of file CurvilinearTrajectoryError.h.

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Member Enumeration Documentation

anonymous enum

parameter dimension

Enumerator:

dimension

Definition at line 30 of file CurvilinearTrajectoryError.h.

{ dimension = 5 };

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Constructor & Destructor Documentation

CurvilinearTrajectoryError::CurvilinearTrajectoryError

(

)

[inline]

Definition at line 35 of file CurvilinearTrajectoryError.h.

{}

CurvilinearTrajectoryError::CurvilinearTrajectoryError

(

const AlgebraicSymMatrix55 &

aCovarianceMatrix

)

[inline]

Constructing class from a full covariance matrix. The sequence of the parameters is the same as the one described above.

Definition at line 40 of file CurvilinearTrajectoryError.h.

                                                                            :
    theCovarianceMatrix(aCovarianceMatrix) { }

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Member Function Documentation

const AlgebraicSymMatrix55& CurvilinearTrajectoryError::matrix

(

void

)

const [inline]

Returning the covariance matrix.

Definition at line 48 of file CurvilinearTrajectoryError.h.

References theCovarianceMatrix.

Referenced by MuonSeedsAnalyzer::analyze(), cms::DiMuonSeedGeneratorHIC::barrelUpdateSeed(), HTrack::computePull(), HICTrajectoryCorrector::correct(), FreeTrajectoryState::createCartesianError(), TSCPBuilderNoMaterial::createFTSatTransverseImpactPointCharged(), TSCPBuilderNoMaterial::createFTSatTransverseImpactPointNeutral(), MuonErrorMatrix::divide(), AnalyticalTrajectoryExtrapolatorToLine::extrapolateSingleState(), AnalyticalImpactPointExtrapolator::extrapolateSingleState(), TrackAnalyzer::fillHistosForState(), GsfTrackProducerBase::fillMode(), cms::HICTkOuterStartingLayerFinder::findForwardLayers(), cms::DiMuonSeedGeneratorHIC::forwardUpdateSeed(), PerigeeConversions::ftsToPerigeeError(), TrajectoryStateAccessor::inversePtError(), MuonErrorMatrix::multiply(), TSCBLBuilderNoMaterial::operator()(), AnalyticalErrorPropagation::operator()(), operator<<(), cms::HICMuonPropagator::propagate(), cms::FastMuPropagator::propagate(), AnalyticalPropagator::propagatedStateWithPath(), cms::HICTkOuterStartingLayerFinder::startingLayers(), SteppingHelixStateInfo::SteppingHelixStateInfo(), MuonNavigableLayer::trackingRange(), and whatIsTheStateToUse().

                                             {
    return theCovarianceMatrix;
  }

CurvilinearTrajectoryError::operator const MathCovarianceMatrix &

(

)

const [inline]

Definition at line 70 of file CurvilinearTrajectoryError.h.

References theCovarianceMatrix.

{ return theCovarianceMatrix; }

CurvilinearTrajectoryError::operator MathCovarianceMatrix

(

)

[inline]

Definition at line 69 of file CurvilinearTrajectoryError.h.

References theCovarianceMatrix.

{ return theCovarianceMatrix; }

void CurvilinearTrajectoryError::operator*=

(

double

factor

)

[inline]

Enables the multiplication of the covariance matrix with the scalar "factor".

Definition at line 55 of file CurvilinearTrajectoryError.h.

References theCovarianceMatrix.

                                   {
    theCovarianceMatrix *= factor;
  }

void CurvilinearTrajectoryError::zeroFieldScaling

(

double

factor

)

[inline]

Definition at line 59 of file CurvilinearTrajectoryError.h.

References i, j, mathSSE::sqrt(), and theCovarianceMatrix.

Referenced by FreeTrajectoryState::rescaleError().

                                      {
    double root_of_factor = sqrt(factor);
    //scale the 0 indexed covariance by the factor
    for (unsigned int i=1;i!=5;++i)      theCovarianceMatrix(i,0)*=root_of_factor;

    //scale all others by the scared factor
    for (unsigned int i=1;i!=5;++i)  for (unsigned int j=i;j!=5;++j) theCovarianceMatrix(i,j)*=factor;
    //term 0,0 is not scaled at all
  }

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Member Data Documentation

AlgebraicSymMatrix55 CurvilinearTrajectoryError::theCovarianceMatrix [private]

Definition at line 73 of file CurvilinearTrajectoryError.h.

Referenced by matrix(), operator const MathCovarianceMatrix &(), operator MathCovarianceMatrix(), operator*=(), and zeroFieldScaling().