Class for measurements implementing a space point hit geometry with a very prolate form of the covariance matrix. More...

#include <ProlateSpacepointMeasurement.h>

Inheritance diagram for ProlateSpacepointMeasurement:

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Collaboration diagram for ProlateSpacepointMeasurement:

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Public Member Functions
	ProlateSpacepointMeasurement (int nDim=3)

	ProlateSpacepointMeasurement (const TVectorD &rawHitCoords, const TMatrixDSym &rawHitCov, int detId, int hitId, TrackPoint *trackPoint)

virtual AbsMeasurement *	clone () const
	Deep copy ctor for polymorphic class.

virtual SharedPlanePtr	constructPlane (const StateOnPlane &state) const
	Contruct the virtual detector plane. More...

const TVector3 &	getLargestErrorDirection ()

void	setLargestErrorDirection (const TVector3 &dir)

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
TVector3	largestErrorDirection_

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 with a very prolate form of the covariance matrix.

Author: Johannes Rauch (Technische Universität München, original author)

Measurements from detectors measuring 3D space points with errors in one direction much larger than the errors perpendicular should use this class.

For these hits, a virtual detector plane lying in the POCA and perpendicular to the track yields wrong results. Instead, the plane should contain the direction of the largest error.

The largest error direction can be set. Standard is in z.

Definition at line 46 of file ProlateSpacepointMeasurement.h.

Member Function Documentation

◆ constructHMatrix()

const AbsHMatrix * constructHMatrix ( const AbsTrackRep * ) const

overridevirtualinherited

Returns a new AbsHMatrix object.

Caller must take ownership.

Implements AbsMeasurement.

Definition at line 120 of file SpacepointMeasurement.cc.

                                                                                       {
   if (dynamic_cast<const RKTrackRep*>(rep) == nullptr) {
     Exception exc("SpacepointMeasurement default implementation can only handle state vectors of type RKTrackRep!", __LINE__,__FILE__);
     throw exc;
   }
  
   return new HMatrixUV();
 }

◆ constructMeasurementsOnPlane()

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

overridevirtualinherited

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

virtual

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.

Reimplemented from SpacepointMeasurement.

Definition at line 43 of file ProlateSpacepointMeasurement.cc.

                                                                                            {
  
   // copy state. Neglect covariance.
   StateOnPlane st(state);
  
  
   const TVector3 wire1(rawHitCoords_(0), rawHitCoords_(1), rawHitCoords_(2));
  
   const AbsTrackRep* rep = state.getRep();
   rep->extrapolateToLine(st, wire1, largestErrorDirection_);
  
   TVector3 dirInPoca = rep->getMom(st);
   dirInPoca.SetMag(1.);
  
   // check if direction is parallel to wire
   if (fabs(largestErrorDirection_.Angle(dirInPoca)) < 0.01){
     Exception exc("ProlateSpacepointMeasurement::constructPlane(): Cannot construct detector plane, track direction is parallel to largest error direction", __LINE__,__FILE__);
     throw exc;
   }
  
   // construct orthogonal vector
   TVector3 U = largestErrorDirection_.Cross(dirInPoca);
  
   return SharedPlanePtr(new DetPlane(wire1, U, largestErrorDirection_));
 }

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

genfit2/code2/measurements/include/ProlateSpacepointMeasurement.h
genfit2/code2/measurements/src/ProlateSpacepointMeasurement.cc

Public Member Functions

Protected Member Functions

Protected Attributes

Private Attributes

Detailed Description

Member Function Documentation

◆ constructHMatrix()

◆ constructMeasurementsOnPlane()

◆ constructPlane()