HELIXPARAMETERFIT_NAME< PointType > Class Template Reference

calculates the helixparameter describing the deviation in z per unit angle, returning unit: none. More...

#include <HelixParameterFit.h>

Inheritance diagram for HELIXPARAMETERFIT_NAME< PointType >:

Public Types
typedef double	variableType
	Type of the returned object.
typedef PointType	argumentType
	Type of the argument object.
typedef FunctionOf< Nargs, variableType, constargumentType & >::functionType	functionType
	Type of the function returning the value.

Public Member Functions
	PUT_NAME_FUNCTION (HELIXPARAMETERFIT_NAME)
	is replaced by "static const std:string name(void)" frunction which returns name of the Class

Static Public Member Functions
static double	value (const PointType &outerHit, const PointType &centerHit, const PointType &innerHit)
	calculates the helixparameter describing the deviation in z per unit angle, returning unit: none
static variableType	value (const PointType &arg1, const PointType &arg2)
	Static method that return the variable associated to:

Static Public Attributes
static const size_t	c_Nargs
	Number of arguments.

Detailed Description

template<typename PointType>
class Belle2::HELIXPARAMETERFIT_NAME< PointType >

calculates the helixparameter describing the deviation in z per unit angle, returning unit: none.

WARNING: this filter returns 0 if no valid value could be found!

Definition at line 30 of file HelixParameterFit.h.

Member Typedef Documentation

argumentType

typedef PointType argumentType

inherited

Type of the argument object.

Needed for SFINAE in Filter.hh

Definition at line 84 of file SelectionVariable.h.

functionType

typedef FunctionOf<Nargs,variableType,constargumentType&>::functionType functionType

inherited

Type of the function returning the value.

Needed for the automated training

Definition at line 88 of file SelectionVariable.h.

variableType

typedef double variableType

inherited

Type of the returned object.

Needed for SFINAE in Filter.hh

Definition at line 81 of file SelectionVariable.h.

Member Function Documentation

value() [1/2]

static variableType value ( const PointType &  arg1, const PointType &  arg2  )

inlinestaticinherited

Static method that return the variable associated to:

Parameters

arg1	first object of the pair
arg2	second object of the pair

N.B. this method must be static.

value() [2/2]

static double value ( const PointType &  outerHit, const PointType &  centerHit, const PointType &  innerHit  )

inlinestatic

calculates the helixparameter describing the deviation in z per unit angle, returning unit: none

Definition at line 37 of file HelixParameterFit.h.

    {
 
      B2Vector3D cCenter = CircleCenterXY<PointType>::value(outerHit, centerHit, innerHit);
 
      B2Vector3D vecOuter2cC(outerHit.X() - cCenter.X(), outerHit.Y() - cCenter.Y(), outerHit.Z() - cCenter.Z());
      B2Vector3D vecCenter2cC(centerHit.X() - cCenter.X(), centerHit.Y() - cCenter.Y(), centerHit.Z() - cCenter.Z());
      B2Vector3D vecInner2cC(innerHit.X() - cCenter.X(), innerHit.Y() - cCenter.Y(), innerHit.Z() - cCenter.Z());
 
      double alfaAB = CosDirectionXY<B2Vector3D>::value(vecOuter2cC, vecCenter2cC);
      double alfaBC = CosDirectionXY<B2Vector3D>::value(vecCenter2cC, vecInner2cC);
 
      // real calculation: ratio is (m_vecij[2] = deltaZ): alfaAB/deltaZab : alfaBC/deltaZbc, the following equation saves two times '/'
      double result = (alfaAB * double(centerHit.Z() - innerHit.Z())) / (alfaBC * double(outerHit.Z() - centerHit.Z()));
 
      return (std::isnan(result) || std::isinf(result)) ? double(0) : result;
    } // return unit: none

Member Data Documentation

c_Nargs

const size_t c_Nargs

staticinherited

Number of arguments.

Definition at line 91 of file SelectionVariable.h.

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

• tracking/trackFindingVXD/filterMap/threeHitVariables/include/HelixParameterFit.h