Chi2Strip1DEstimator Class Reference

#include <Chi2Strip1DEstimator.h>

Inheritance diagram for Chi2Strip1DEstimator:

Public Member Functions
	Chi2Strip1DEstimator (double maxChi2, double nSigma=3.)
virtual Chi2Strip1DEstimator *	clone () const
virtual std::pair< bool, double >	estimate (const TrajectoryStateOnSurface &, const TransientTrackingRecHit &) const
Public Member Functions inherited from Chi2MeasurementEstimatorBase
	Chi2MeasurementEstimatorBase (double maxChi2, double nSigma=3.)
double	chiSquaredCut () const
virtual bool	estimate (const TrajectoryStateOnSurface &ts, const BoundPlane &plane) const
virtual Local2DVector	maximalLocalDisplacement (const TrajectoryStateOnSurface &ts, const BoundPlane &plane) const
double	nSigmaCut () const
Public Member Functions inherited from MeasurementEstimator
virtual	~MeasurementEstimator ()

Additional Inherited Members
Public Types inherited from MeasurementEstimator
typedef std::pair< bool, double >	HitReturnType
typedef Vector2DBase< float, LocalTag >	Local2DVector
typedef bool	SurfaceReturnType
Protected Member Functions inherited from Chi2MeasurementEstimatorBase
std::pair< bool, double >	returnIt (double est) const

Detailed Description

A Chi2 MeasurementEstimator that only uses the X coordinate in the measurement frame (the one perpendicular to the strip). Ported from ORCA.

Date:

2007/05/09 14:05:13

Revision:

1.2

Author

todorov, cerati

Definition at line 16 of file Chi2Strip1DEstimator.h.

Constructor & Destructor Documentation

Chi2Strip1DEstimator::Chi2Strip1DEstimator ( double  maxChi2, double  nSigma = 3.  )

inlineexplicit

Definition at line 20 of file Chi2Strip1DEstimator.h.

Referenced by clone().

                                                                    : 
    Chi2MeasurementEstimatorBase( maxChi2, nSigma) {}

Member Function Documentation

virtual Chi2Strip1DEstimator* Chi2Strip1DEstimator::clone ( void  ) const

inlinevirtual

Implements MeasurementEstimator.

Definition at line 26 of file Chi2Strip1DEstimator.h.

References Chi2Strip1DEstimator().

                                              {
    return new Chi2Strip1DEstimator(*this);
  }

pair< bool, double > Chi2Strip1DEstimator::estimate ( const TrajectoryStateOnSurface &  ts, const TransientTrackingRecHit &  hit  ) const

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 Chi2MeasurementEstimatorBase.

Definition at line 9 of file Chi2Strip1DEstimator.cc.

References funct::C, TransientTrackingRecHit::detUnit(), GeomDetType::isTrackerPixel(), TrajectoryStateOnSurface::localError(), TrackingRecHit::localPosition(), TrajectoryStateOnSurface::localPosition(), TrackingRecHit::localPositionError(), m, Topology::measurementError(), Topology::measurementPosition(), LocalTrajectoryError::positionError(), dttmaxenums::R, alignCSCRings::r, GeomDetUnit::topology(), GeomDetUnit::type(), and vdt::x.

                                                             {

  if(//hit.isMatched() || 
     hit.detUnit()->type().isTrackerPixel() 
     ) return HitReturnType(false,0.);
  
 
  const StripTopology* topology = 
    dynamic_cast<const StripTopology*>(&(hit.detUnit()->topology())); 
  
  double m = topology->measurementPosition(hit.localPosition()).x();
  
  double x = topology->measurementPosition(state.localPosition()).x();
  
  double V =
    topology->measurementError(hit.localPosition(),
                   hit.localPositionError()).uu();
  double C = 
    topology->measurementError(state.localPosition(),
                   state.localError().positionError()).uu();
  double r = m - x;
  double R = V + C;

  double est = r*r/R;

  return returnIt(est);
}