Chi2MeasurementEstimatorBase Class Reference

#include <Chi2MeasurementEstimatorBase.h>

Inheritance diagram for Chi2MeasurementEstimatorBase:

Public Member Functions
	Chi2MeasurementEstimatorBase (double maxChi2, double nSigma=3., float maxDisp=std::numeric_limits< float >::max())
	Chi2MeasurementEstimatorBase (double maxChi2, double nSigma, float maxDisp, float maxSag, float minToll)
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 final
virtual Local2DVector	maximalLocalDisplacement (const TrajectoryStateOnSurface &ts, const Plane &plane) const final
double	nSigmaCut () const
Public Member Functions inherited from MeasurementEstimator
virtual MeasurementEstimator *	clone () const =0
float	maxSagitta () const
	MeasurementEstimator ()
	MeasurementEstimator (float maxSag, float minToll)
float	minTolerance2 () const
virtual bool	preFilter (const TrajectoryStateOnSurface &, OpaquePayload const &) const
virtual	~MeasurementEstimator ()

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

Private Attributes
const double	theMaxChi2
const float	theMaxDisplacement
const double	theNSigma

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

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., float  maxDisp = std::numeric_limits<float>::max()  )

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), theMaxDisplacement(maxDisp) {}

Chi2MeasurementEstimatorBase::Chi2MeasurementEstimatorBase ( double  maxChi2, double  nSigma, float  maxDisp, float  maxSag, float  minToll  )

inline

Definition at line 25 of file Chi2MeasurementEstimatorBase.h.

                                                            : 
    MeasurementEstimator(maxSag,minToll),
    theMaxChi2(maxChi2), theNSigma(nSigma), theMaxDisplacement(maxDisp)  {}

Member Function Documentation

double Chi2MeasurementEstimatorBase::chiSquaredCut ( ) const

inline

Definition at line 41 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, EtaPhiEstimator, MRHChi2MeasurementEstimator, Chi2Strip1DEstimator, Chi2MeasurementEstimator, and MRHChi2MeasurementEstimator.

Referenced by EtaPhiEstimator::estimate().

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

finalvirtual

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

Implements MeasurementEstimator.

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

finalvirtual

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().

Implements MeasurementEstimator.

Definition at line 17 of file Chi2MeasurementEstimatorBase.cc.

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

{
  const float emax = theMaxDisplacement;
  if ( ts.hasError()) {
    LocalError le = ts.localError().positionError();
    return Local2DVector( std::min(emax,std::sqrt(float(le.xx())))*nSigmaCut(), std::min(emax,std::sqrt(float(le.yy())))*nSigmaCut());
  }
  else return Local2DVector(emax,emax);
}

double Chi2MeasurementEstimatorBase::nSigmaCut ( ) const

inline

Definition at line 42 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 46 of file Chi2MeasurementEstimatorBase.h.

References chiSquaredCut().

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

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

Member Data Documentation

const double Chi2MeasurementEstimatorBase::theMaxChi2

private

Definition at line 51 of file Chi2MeasurementEstimatorBase.h.

Referenced by chiSquaredCut().

const float Chi2MeasurementEstimatorBase::theMaxDisplacement

private

Definition at line 53 of file Chi2MeasurementEstimatorBase.h.

Referenced by maximalLocalDisplacement().

const double Chi2MeasurementEstimatorBase::theNSigma

private

Definition at line 52 of file Chi2MeasurementEstimatorBase.h.

Referenced by nSigmaCut().