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genfit::WireMeasurement Class Reference

Class for measurements in wire detectors (Straw tubes and drift chambers) which do not measure the coordinate along the wire. More...

#include <GenFit/blob/master/measurements/include/WireMeasurement.h>

+ Inheritance diagram for genfit::WireMeasurement:
+ Collaboration diagram for genfit::WireMeasurement:

Public Member Functions

 WireMeasurement (int nDim=7)
 
 WireMeasurement (const TVectorD &rawHitCoords, const TMatrixDSym &rawHitCov, int detId, int hitId, TrackPoint *trackPoint)
 
virtual ~WireMeasurement ()
 
virtual AbsMeasurement * clone () const override
 Deep copy ctor for polymorphic class.
 
virtual SharedPlanePtr constructPlane (const StateOnPlane &state) const override
 
virtual std::vector
< MeasurementOnPlane * > 		constructMeasurementsOnPlane (const StateOnPlane &state) const override
 
virtual const AbsHMatrix * constructHMatrix (const AbsTrackRep *) const override
 
void setMaxDistance (double d)
 
void setLeftRightResolution (int lr)
 
virtual bool isLeftRightMeasurement () const override
 If the AbsMeasurement is a wire hit, the left/right resolution will be used.
 
virtual int getLeftRightResolution () const override
 
double getMaxDistance ()
 
- 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
 
TVectorD & getRawHitCoords ()
 
TMatrixDSym & getRawHitCov ()
 
int getDetId () const
 
int getHitId () 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 Attributes

double maxDistance_
 
signed char leftRight_
 
- 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 in wire detectors (Straw tubes and drift chambers) which do not measure the coordinate along the wire.

Author
Christian Höppner (Technische Universität München, original author)
Lia Lavezzi (INFN Pavia, original author)
Sebastian Neubert (Technische Universität München, original author)
Johannes Rauch (Technische Universität München, original author)

This hit class is not valid for any kind of plane orientation choice: to use it you MUST choose a plane described by u and v axes with v coincident with the wire (and u orthogonal to it, obviously). The hit will be described by 7 coordinates: w_x1, w_y1, w_z1, w_x2, w_y2, w_z2, rdrift where w_ji (with j = x, y, z and i = 1, 2) are the wire extremities coordinates; rdrift = distance from the wire (u coordinate in the plane)

Definition at line 52 of file WireMeasurement.h.

View newest version in sPHENIX GitHub at line 52 of file WireMeasurement.h

Constructor & Destructor Documentation

genfit::WireMeasurement::WireMeasurement ( int  nDim = 7)

Definition at line 39 of file WireMeasurement.cc.

View newest version in sPHENIX GitHub at line 39 of file WireMeasurement.cc

References assert.

Referenced by clone().

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

Definition at line 45 of file WireMeasurement.cc.

View newest version in sPHENIX GitHub at line 45 of file WireMeasurement.cc

References assert, and genfit::AbsMeasurement::rawHitCoords_.

virtual genfit::WireMeasurement::~WireMeasurement ( )
inlinevirtual

Definition at line 58 of file WireMeasurement.h.

View newest version in sPHENIX GitHub at line 58 of file WireMeasurement.h

Member Function Documentation

virtual AbsMeasurement* genfit::WireMeasurement::clone ( ) const
inlineoverridevirtual

Deep copy ctor for polymorphic class.

Implements genfit::AbsMeasurement.

Reimplemented in genfit::WirePointMeasurement.

Definition at line 60 of file WireMeasurement.h.

View newest version in sPHENIX GitHub at line 60 of file WireMeasurement.h

References WireMeasurement().

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const AbsHMatrix * genfit::WireMeasurement::constructHMatrix ( const AbsTrackRep *  ) const
overridevirtual

Returns a new AbsHMatrix object. Caller must take ownership.

Implements genfit::AbsMeasurement.

Reimplemented in genfit::WirePointMeasurement.

Definition at line 120 of file WireMeasurement.cc.

View newest version in sPHENIX GitHub at line 120 of file WireMeasurement.cc

Referenced by constructMeasurementsOnPlane().

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

Hits with a small drift distance get a higher weight, whereas hits with big drift distances become weighted down. When these initial weights are used by the DAF, the smoothed track will be closer to the real trajectory than if both sides are weighted with 0.5 regardless of the drift distance. This helps a lot when resolving l/r ambiguities with the DAF. The idea is that for the first iteration of the DAF, the wire positions are taken. For small drift radii, the wire position does not bend the fit away from the trajectory, whereas the wire position for hits with large drift radii is further away from the trajectory and will therefore bias the fit if not weighted down.

Implements genfit::AbsMeasurement.

Reimplemented in genfit::WirePointMeasurement.

Definition at line 85 of file WireMeasurement.cc.

View newest version in sPHENIX GitHub at line 85 of file WireMeasurement.cc

References constructHMatrix(), genfit::StateOnPlane::getPlane(), genfit::StateOnPlane::getRep(), leftRight_, maxDistance_, genfit::AbsMeasurement::rawHitCoords_, genfit::AbsMeasurement::rawHitCov_, and genfit::MeasurementOnPlane::setWeight().

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SharedPlanePtr genfit::WireMeasurement::constructPlane ( const StateOnPlane &  state) const
overridevirtual

Construct (virtual) detector plane (use state's AbsTrackRep). It's possible to make corrections to the plane here. The state should be defined somewhere near the measurement. For virtual planes, the state will be extrapolated to the POCA to point (SpacepointMeasurement) or line (WireMeasurement), and from this info the plane will be constructed.

Implements genfit::AbsMeasurement.

Reimplemented in genfit::WirePointMeasurement.

Definition at line 51 of file WireMeasurement.cc.

View newest version in sPHENIX GitHub at line 51 of file WireMeasurement.cc

References genfit::AbsTrackRep::extrapolateToLine(), genfit::AbsTrackRep::getMom(), genfit::AbsTrackRep::getPos(), genfit::StateOnPlane::getRep(), and genfit::AbsMeasurement::rawHitCoords_.

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virtual int genfit::WireMeasurement::getLeftRightResolution ( ) const
inlineoverridevirtual

Reimplemented from genfit::AbsMeasurement.

Definition at line 91 of file WireMeasurement.h.

View newest version in sPHENIX GitHub at line 91 of file WireMeasurement.h

References leftRight_.

double genfit::WireMeasurement::getMaxDistance ( )
inline

Definition at line 93 of file WireMeasurement.h.

View newest version in sPHENIX GitHub at line 93 of file WireMeasurement.h

References maxDistance_.

virtual bool genfit::WireMeasurement::isLeftRightMeasurement ( ) const
inlineoverridevirtual

If the AbsMeasurement is a wire hit, the left/right resolution will be used.

Reimplemented from genfit::AbsMeasurement.

Definition at line 90 of file WireMeasurement.h.

View newest version in sPHENIX GitHub at line 90 of file WireMeasurement.h

void genfit::WireMeasurement::setLeftRightResolution ( int  lr)

select how to resolve the left/right ambiguity: -1: negative (left) side on vector (track direction) x (wire direction) 0: auto select (take side with smallest distance to track) 1: positive (right) side on vector (track direction) x (wire direction)

Definition at line 129 of file WireMeasurement.cc.

View newest version in sPHENIX GitHub at line 129 of file WireMeasurement.cc

References leftRight_.

void genfit::WireMeasurement::setMaxDistance ( double  d)
inline

Set maximum drift distance. This is used to calculate the start weights of the two measurementsOnPlane.

Definition at line 81 of file WireMeasurement.h.

View newest version in sPHENIX GitHub at line 81 of file WireMeasurement.h

References maxDistance_.

Member Data Documentation

signed char genfit::WireMeasurement::leftRight_
protected

Definition at line 98 of file WireMeasurement.h.

View newest version in sPHENIX GitHub at line 98 of file WireMeasurement.h

Referenced by genfit::WirePointMeasurement::constructMeasurementsOnPlane(), constructMeasurementsOnPlane(), getLeftRightResolution(), and setLeftRightResolution().

double genfit::WireMeasurement::maxDistance_
protected

Definition at line 97 of file WireMeasurement.h.

View newest version in sPHENIX GitHub at line 97 of file WireMeasurement.h

Referenced by genfit::WirePointMeasurement::constructMeasurementsOnPlane(), constructMeasurementsOnPlane(), getMaxDistance(), and setMaxDistance().

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