Chi2MeasurementEstimatorBase Class Reference

#include <Chi2MeasurementEstimatorBase.h>

Inheritance diagram for Chi2MeasurementEstimatorBase:

Public Member Functions
	Chi2MeasurementEstimatorBase (double maxChi2, double nSigma=3.)
double	chiSquaredCut () const
virtual std::pair< bool, double >	estimate (const TrajectoryStateOnSurface &ts, const TrackingRecHit &) const =0
virtual bool	estimate (const TrajectoryStateOnSurface &ts, const Plane &plane) const
virtual Local2DVector	maximalLocalDisplacement (const TrajectoryStateOnSurface &ts, const Plane &plane) const
double	nSigmaCut () const
Public Member Functions inherited from MeasurementEstimator
virtual MeasurementEstimator *	clone () const =0
virtual bool	preFilter (const TrajectoryStateOnSurface &, OpaquePayload const &) const
virtual	~MeasurementEstimator ()

Protected Member Functions
std::pair< bool, double >	returnIt (double est) const

Private Attributes
double	theMaxChi2
double	theNSigma

Additional Inherited Members
Public Types inherited from MeasurementEstimator
typedef std::pair< bool, double >	HitReturnType
typedef Vector2DBase< float, LocalTag >	Local2DVector
typedef bool	SurfaceReturnType

Detailed Description

A base class for Chi2 – type of Measurement Estimators. Implements common functionality. Ported from ORCA.

Author

todorov, cerati

Definition at line 14 of file Chi2MeasurementEstimatorBase.h.

Constructor & Destructor Documentation

Chi2MeasurementEstimatorBase::Chi2MeasurementEstimatorBase ( double  maxChi2, double  nSigma = 3.  )

inlineexplicit

Construct with cuts on chi2 and nSigma. The cut on Chi2 is used to define the acceptance of RecHits. The errors of the trajectory state are multiplied by nSigma to define acceptance of Plane and maximalLocalDisplacement.

Definition at line 22 of file Chi2MeasurementEstimatorBase.h.

                                                                            : 
    theMaxChi2(maxChi2), theNSigma(nSigma) {}

Member Function Documentation

double Chi2MeasurementEstimatorBase::chiSquaredCut ( ) const

inline

Definition at line 35 of file Chi2MeasurementEstimatorBase.h.

References theMaxChi2.

Referenced by returnIt().

{return theMaxChi2;}

virtual std::pair<bool, double> Chi2MeasurementEstimatorBase::estimate ( const TrajectoryStateOnSurface &  ts, const TrackingRecHit &  hit  ) const

pure virtual

Returns pair( true, value) if the TrajectoryStateOnSurface is compatible with the RecHit, and pair( false, value) if it is not compatible. The TrajectoryStateOnSurface must be on the same Surface as the RecHit. For an estimator where there is no value computed, e.g. fixed window estimator, only the first(bool) part is of interest.

Implements MeasurementEstimator.

Implemented in MuonChi2MeasurementEstimator, Chi2Switching1DEstimator, GsfChi2MeasurementEstimator, Chi2MeasurementEstimator, EtaPhiMeasurementEstimator, EtaPhiEstimator, MRHChi2MeasurementEstimator, Chi2Strip1DEstimator, and MRHChi2MeasurementEstimator.

Referenced by EtaPhiEstimator::estimate().

bool Chi2MeasurementEstimatorBase::estimate ( const TrajectoryStateOnSurface &  ts, const Plane &  plane  ) const

virtual

Returns true if the TrajectoryStateOnSurface is compatible with the Plane, false otherwise. The TrajectoryStateOnSurface must be on the plane.

Implements MeasurementEstimator.

Reimplemented in EtaPhiMeasurementEstimator.

Definition at line 5 of file Chi2MeasurementEstimatorBase.cc.

References Surface::bounds(), TrajectoryStateOnSurface::hasError(), Bounds::inside(), TrajectoryStateOnSurface::localError(), TrajectoryStateOnSurface::localPosition(), nSigmaCut(), and LocalTrajectoryError::positionError().

{
  if ( ts.hasError()) {
    return plane.bounds().inside( ts.localPosition(), 
                  ts.localError().positionError(),
                  nSigmaCut());
  }
  else return plane.bounds().inside(ts.localPosition());
}

MeasurementEstimator::Local2DVector Chi2MeasurementEstimatorBase::maximalLocalDisplacement ( const TrajectoryStateOnSurface &  ts, const Plane &  plane  ) const

virtual

Returns the size of the compatibility region around the local position of the TrajectoryStateOnSurface along the directions of local x and y axis. The TrajectoryStateOnSurface must be on the plane. This method allows to limit the search for compatible detectors or RecHits. The MeasurementEstimator should not return "true" for any RecHit or Plane which is entirely outside of the compatibility region defined by maximalLocalDisplacement().

Reimplemented from MeasurementEstimator.

Reimplemented in EtaPhiMeasurementEstimator.

Definition at line 17 of file Chi2MeasurementEstimatorBase.cc.

References TrajectoryStateOnSurface::hasError(), TrajectoryStateOnSurface::localError(), nSigmaCut(), LocalTrajectoryError::positionError(), mathSSE::sqrt(), LocalError::xx(), and LocalError::yy().

{
  if ( ts.hasError()) {
    LocalError le = ts.localError().positionError();
    return Local2DVector( sqrt(le.xx())*nSigmaCut(), sqrt(le.yy())*nSigmaCut());
  }
  else return Local2DVector(0,0);
}

double Chi2MeasurementEstimatorBase::nSigmaCut ( ) const

inline

Definition at line 36 of file Chi2MeasurementEstimatorBase.h.

References theNSigma.

Referenced by estimate(), and maximalLocalDisplacement().

{return theNSigma;}

std::pair<bool,double> Chi2MeasurementEstimatorBase::returnIt ( double  est ) const

inlineprotected

Definition at line 40 of file Chi2MeasurementEstimatorBase.h.

References chiSquaredCut().

Referenced by GsfChi2MeasurementEstimator::estimate(), and Chi2MeasurementEstimator::estimate().

                                                   {
    return est > chiSquaredCut() ? HitReturnType(false,est) : HitReturnType(true,est);
  }

Member Data Documentation

double Chi2MeasurementEstimatorBase::theMaxChi2

private

Definition at line 45 of file Chi2MeasurementEstimatorBase.h.

Referenced by chiSquaredCut().

double Chi2MeasurementEstimatorBase::theNSigma

private

Definition at line 46 of file Chi2MeasurementEstimatorBase.h.

Referenced by nSigmaCut().