VXDMomentumEstimation< ClusterType > Class Template Reference

Class doing the momentum estimation from dEdX for SVDClusters and PXDClusters. More...

#include <VXDMomentumEstimation.h>

Classes
struct	CorrectionFitParameters
	Struct holding the parameters of the correction function to map them median of the estimation function to 0. More...
struct	FitParameters
	Struct holding the parameters of the estimation function which maps dEdX to p. More...

Public Member Functions
double	estimateQOverP (const ClusterType &cluster, const ROOT::Math::XYZVector &momentum, const ROOT::Math::XYZVector &position, short charge, const FitParameters &fitParameters, const CorrectionFitParameters &correctionFitParameters) const
	Main function: Estimate p over q for the given cluster and the path length calculated using the given tracking seeds with the fit parameters.
double	estimateQOverPWithThickness (const ClusterType &cluster, short charge, const FitParameters &fitParameters, const CorrectionFitParameters &correctionFitParameters) const
	Main function: Estimate p over q for the given cluster and the thickness of the cluster with the fit parameters.
double	convertDEDXToMomentum (double dEdX, const FitParameters &fitParameters, const CorrectionFitParameters &correctionFitParameters) const
	After calculating dEdX we need to map this to p using a predefined function and parameters that were extracted with a fit to mc data.

Static Public Member Functions
static const VXDMomentumEstimation &	getInstance ()
	Use this class as a singleton.

Private Member Functions
	VXDMomentumEstimation ()
	Do not copy or create.
	VXDMomentumEstimation (const VXDMomentumEstimation &)
	Do not copy or create.
VXDMomentumEstimation &	operator= (const VXDMomentumEstimation &)
	Do not copy or create.

Detailed Description

template<class ClusterType>
class Belle2::VXDMomentumEstimation< ClusterType >

Class doing the momentum estimation from dEdX for SVDClusters and PXDClusters.

It uses a precompiled estimator function (given by the parameters FitParameters and CorrectionFitParameters and calculates the momentum estimation based on dEdX that get compiled from the ADC count and the path length of each given hit. For calculating the path length, some helix parameter must be used, than can for example come from the track fit.

Template class for SVD or PXD clusters.

Definition at line 27 of file VXDMomentumEstimation.h.

Constructor & Destructor Documentation

VXDMomentumEstimation()

VXDMomentumEstimation ( )

inlineprivate

Do not copy or create.

Definition at line 31 of file VXDMomentumEstimation.h.

{ }

Member Function Documentation

convertDEDXToMomentum()

double convertDEDXToMomentum ( double  dEdX, const FitParameters &  fitParameters, const CorrectionFitParameters &  correctionFitParameters  ) const

inline

After calculating dEdX we need to map this to p using a predefined function and parameters that were extracted with a fit to mc data.

Definition at line 101 of file VXDMomentumEstimation.h.

    {
      const double firstPart = fitParameters.aE / (dEdX - fitParameters.bE) / (dEdX - fitParameters.bE);
      const double lastPart = fitParameters.cE + fitParameters.dE * dEdX;
      const double estimation = firstPart + lastPart;
 
      const double quadPart = correctionFitParameters.aM * estimation * estimation;
      const double linearPart = correctionFitParameters.bM * estimation;
      const double constantPart = correctionFitParameters.cM;
      const double cubicPart = correctionFitParameters.dM * estimation * estimation * estimation;
      const double mediumCorrection = cubicPart + quadPart + linearPart + constantPart;
 
      const double estimationWithMediumCalibration = estimation - mediumCorrection;
      return estimationWithMediumCalibration;
    }

estimateQOverP()

double estimateQOverP ( const ClusterType &  cluster, const ROOT::Math::XYZVector &  momentum, const ROOT::Math::XYZVector &  position, short  charge, const FitParameters &  fitParameters, const CorrectionFitParameters &  correctionFitParameters  ) const

inline

Main function: Estimate p over q for the given cluster and the path length calculated using the given tracking seeds with the fit parameters.

Definition at line 72 of file VXDMomentumEstimation.h.

    {
      const VXDMomentumEstimationTools<ClusterType>& tools = VXDMomentumEstimationTools<ClusterType>::getInstance();
 
      const double dEdX = tools.getDEDX(cluster, momentum, position, charge);
      const double momentumEstimation = convertDEDXToMomentum(dEdX, fitParameters, correctionFitParameters);
      const double QOverP = charge / momentumEstimation;
 
      return QOverP;
    }

estimateQOverPWithThickness()

double estimateQOverPWithThickness ( const ClusterType &  cluster, short  charge, const FitParameters &  fitParameters, const CorrectionFitParameters &  correctionFitParameters  ) const

inline

Main function: Estimate p over q for the given cluster and the thickness of the cluster with the fit parameters.

Definition at line 87 of file VXDMomentumEstimation.h.

    {
      const VXDMomentumEstimationTools<ClusterType>& tools = VXDMomentumEstimationTools<ClusterType>::getInstance();
 
      const double dEdX = tools.getDEDXWithThickness(cluster);
      const double momentumEstimation = convertDEDXToMomentum(dEdX, fitParameters, correctionFitParameters);
      const double QOverP = charge / momentumEstimation;
 
      return QOverP;
    }

getInstance()

static const VXDMomentumEstimation & getInstance ( )

inlinestatic

Use this class as a singleton.

Definition at line 64 of file VXDMomentumEstimation.h.

    {
      static VXDMomentumEstimation instance;
      return instance;
    }

---

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

• tracking/vxdMomentumEstimation/include/VXDMomentumEstimation.h