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 genfit::ProlateSpacepointMeasurement:

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Collaboration diagram for genfit::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	~ProlateSpacepointMeasurement ()

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

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

const TVector3 &	getLargestErrorDirection ()

void	setLargestErrorDirection (const TVector3 &dir)

Public Member Functions inherited from genfit::SpacepointMeasurement
	SpacepointMeasurement (int nDim=3)

	SpacepointMeasurement (const TVectorD &rawHitCoords, const TMatrixDSym &rawHitCov, int detId, int hitId, TrackPoint *trackPoint, bool weightedPlaneContruction=true, bool cutCov=true)

virtual	~SpacepointMeasurement ()

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

virtual const AbsHMatrix *	constructHMatrix (const AbsTrackRep *) const

Public Member Functions inherited from genfit::AbsMeasurement
	AbsMeasurement ()

	AbsMeasurement (int nDims)

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

virtual	~AbsMeasurement ()

TrackPoint *	getTrackPoint () const

void	setTrackPoint (TrackPoint *tp)

const TVectorD &	getRawHitCoords () const

const TMatrixDSym &	getRawHitCov () const

int	getDetId () const

int	getHitId () const

unsigned int	getDim () const

void	setDetId (int detId)

void	setHitId (int hitId)

virtual void	Print (const Option_t *="") const

Protected Attributes
TVector3	largestErrorDirection_

Protected Attributes inherited from genfit::AbsMeasurement
TVectorD	rawHitCoords_

TMatrixDSym	rawHitCov_

int	detId_

int	hitId_

TrackPoint *	trackPoint_
	Pointer to TrackPoint where the measurement belongs to.

Additional Inherited Members
Protected Member Functions inherited from genfit::AbsMeasurement
	AbsMeasurement (const AbsMeasurement &)
	protect from calling copy c'tor from outside the class. Use clone() if you want a copy!

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.

Constructor & Destructor Documentation

◆ ProlateSpacepointMeasurement() [1/2]

genfit::ProlateSpacepointMeasurement::ProlateSpacepointMeasurement ( int nDim = 3 )

Definition at line 30 of file ProlateSpacepointMeasurement.cc.

  : SpacepointMeasurement(nDim), largestErrorDirection_(0,0,1)
{
  ;
}

◆ ProlateSpacepointMeasurement() [2/2]

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

Definition at line 36 of file ProlateSpacepointMeasurement.cc.

  : SpacepointMeasurement(rawHitCoords, rawHitCov, detId, hitId, trackPoint), largestErrorDirection_(0,0,1)
{
  ;
}

◆ ~ProlateSpacepointMeasurement()

virtual genfit::ProlateSpacepointMeasurement::~ProlateSpacepointMeasurement ( )

inlinevirtual

Definition at line 52 of file ProlateSpacepointMeasurement.h.

52{;}

Member Function Documentation

◆ clone()

virtual AbsMeasurement * genfit::ProlateSpacepointMeasurement::clone ( ) const

inlinevirtual

Deep copy ctor for polymorphic class.

Reimplemented from genfit::SpacepointMeasurement.

Definition at line 54 of file ProlateSpacepointMeasurement.h.

54{return new ProlateSpacepointMeasurement(*this);}

genfit::ProlateSpacepointMeasurement::ProlateSpacepointMeasurement

ProlateSpacepointMeasurement(int nDim=3)

Definition ProlateSpacepointMeasurement.cc:30

◆ constructPlane()

SharedPlanePtr genfit::ProlateSpacepointMeasurement::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 genfit::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_));
}