SpacepointMeasurement Class Reference

Class for measurements implementing a space point hit geometry. More...

#include <SpacepointMeasurement.h>

Inheritance diagram for SpacepointMeasurement:

Collaboration diagram for SpacepointMeasurement:

Public Member Functions
	SpacepointMeasurement (int nDim=3)
	SpacepointMeasurement (const TVectorD &rawHitCoords, const TMatrixDSym &rawHitCov, int detId, int hitId, TrackPoint *trackPoint, bool weightedPlaneContruction=true, bool cutCov=true)
virtual AbsMeasurement *	clone () const override
	Deep copy ctor for polymorphic class.
virtual SharedPlanePtr	constructPlane (const StateOnPlane &state) const override
	Contruct the virtual detector plane. More...
virtual std::vector< MeasurementOnPlane * >	constructMeasurementsOnPlane (const StateOnPlane &state) const override
	Construct MeasurementOnPlane on plane of the state and wrt the states TrackRep. More...
virtual const AbsHMatrix *	constructHMatrix (const AbsTrackRep *) const override
	Returns a new AbsHMatrix object. More...
bool	getWeightedPlaneConstruction () const
	false: project 3D cov onto DetPlane. true: cut 3D cov with DetPlane
void	setWeightedPlaneConstruction (bool value)
bool	getCutCov () const
	false: use POCA to construct DetPlane. true: Use metric G to construct POCA
void	setCutCov (bool value)
TrackPoint *	getTrackPoint () const
void	setTrackPoint (TrackPoint *tp)
const TVectorD &	getRawHitCoords () const
TVectorD &	getRawHitCoords ()
const TMatrixDSym &	getRawHitCov () const
TMatrixDSym &	getRawHitCov ()
int	getDetId () const
int	getHitId () const
virtual bool	isLeftRightMeasurement () const
	If the AbsMeasurement is a wire hit, the left/right resolution will be used.
virtual int	getLeftRightResolution () const
unsigned int	getDim () const
void	setRawHitCoords (const TVectorD &coords)
void	setRawHitCov (const TMatrixDSym &cov)
void	setDetId (int detId)
void	setHitId (int hitId)
virtual void	Print (const Option_t *="") const

Protected Member Functions
void	initG ()

Protected Attributes
TVectorD	rawHitCoords_
TMatrixDSym	rawHitCov_
int	detId_
int	hitId_
TrackPoint *	trackPoint_
	Pointer to TrackPoint where the measurement belongs to.

Private Attributes
bool	weightedPlaneContruction_
TMatrixDSym	G_
bool	cutCov_
	inverse of 3x3 cov

Detailed Description

Class for measurements implementing a space point hit geometry.

Author

Christian Höppner (Technische Universität München, original author)

Sebastian Neubert (Technische Universität München, original author)

Johannes Rauch (Technische Universität München, original author)

For a space point the detector plane has to be defined with respect to a track representation. SpacepointMeasurement implements a scheme where the detectorplane is chosen perpendicular to the track. In a track fit, only two of the three coordinates of a space point are independent (the track is a one-dimensional object). Therefore the 3D data of the hit is used to define a proper detector plane into which the hit coordinates are then projected.

Definition at line 46 of file SpacepointMeasurement.h.

Member Function Documentation

constructHMatrix()

const AbsHMatrix * constructHMatrix ( const AbsTrackRep *  ) const

overridevirtual

Returns a new AbsHMatrix object.

Caller must take ownership.

Implements AbsMeasurement.

Definition at line 120 of file SpacepointMeasurement.cc.

constructMeasurementsOnPlane()

std::vector< MeasurementOnPlane * > constructMeasurementsOnPlane ( const StateOnPlane &  state ) const

overridevirtual

Construct MeasurementOnPlane on plane of the state and wrt the states TrackRep.

The state will usually be the prediction or reference state, and has to be defined AT the measurement. The AbsMeasurement will be projected onto the plane. It's possible to make corrections to the coordinates here (e.g. by using the state coordinates). Usually the vector will contain only one element. But in the case of e.g. a WireMeasurement, it will be 2 (left and right).

Implements AbsMeasurement.

Definition at line 69 of file SpacepointMeasurement.cc.

constructPlane()

SharedPlanePtr constructPlane ( const StateOnPlane &  state ) const

overridevirtual

Contruct the virtual detector plane.

Per default, the plane will be constructed such that it contains the measurement and POCA to the measurement in cartesian space. The plane is perpendicular to the track (at the POCA).

If weightedPlaneContruction_ is set, the POCA will be calculated in a space weighted with the inverse of the 3D covariance. E.g. if the covariance is very oblate, the plane will be almost defined by the covariance shape. If the covariance is very prolate, the behaviour will be very similar to the ProlateSpacepointHit.

Implements AbsMeasurement.

Reimplemented in ProlateSpacepointMeasurement.

Definition at line 53 of file SpacepointMeasurement.cc.

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The documentation for this class was generated from the following files:

• genfit2/code2/measurements/include/SpacepointMeasurement.h
• genfit2/code2/measurements/src/SpacepointMeasurement.cc