DELTASOVERZ_NAME< PointType > Class Template Reference

calculates the helixparameter describing the deviation in arc length per unit in z. More...

#include <DeltaSoverZ.h>

Inheritance diagram for DELTASOVERZ_NAME< PointType >:

Collaboration diagram for DELTASOVERZ_NAME< PointType >:

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

Public Member Functions
	PUT_NAME_FUNCTION (DELTASOVERZ_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 arc length per unit in z. More...
static variableType	value (const PointType &arg1, const PointType &arg2)
	Static method that return the variable associated to: More...

Static Public Attributes
static const size_t	c_Nargs
	Number of arguments.

Detailed Description

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

calculates the helixparameter describing the deviation in arc length per unit in z.

returning unit: radians*cm.

Definition at line 28 of file DeltaSoverZ.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, const argumentType&>::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 templateArgumentType &  arg1, const templateArgumentType &  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 arc length per unit in z.

returning unit: radians*cm

Definition at line 36 of file DeltaSoverZ.h.

    {
 
      B2Vector3D circleCenter = CircleCenterXY<PointType>::value(outerHit, centerHit, innerHit);
      B2Vector3D points2outerHit((outerHit.X() - circleCenter.X()),
                                 (outerHit.Y() - circleCenter.Y()),
                                 (outerHit.Z() - circleCenter.Z()));
      B2Vector3D points2centerHit((centerHit.X() - circleCenter.X()),
                                  (centerHit.Y() - circleCenter.Y()),
                                  (centerHit.Z() - circleCenter.Z()));
      B2Vector3D points2innerHit((innerHit.X() - circleCenter.X()),
                                 (innerHit.Y() - circleCenter.Y()),
                                 (innerHit.Z() - circleCenter.Z()));
 
      double alfaOC = acos(CosDirectionXY<B2Vector3D>::value(points2outerHit, points2centerHit));
      double alfaCI = acos(CosDirectionXY<B2Vector3D>::value(points2centerHit, points2innerHit));
 
      // equals to alfaAB/dZAB and alfaBC/dZBC, but this solution here can not produce a division by zero:
      return (alfaOC * double(centerHit.Z() - innerHit.Z())) - (alfaCI * double(outerHit.Z() - centerHit.Z()));
    } // return unit: radians*cm

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

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