SLOPERZ_NAME< PointType > Class Template Reference

This is the specialization for SpacePoints with returning floats, where value calculates the slope in R-Z for a given pair of hits. More...

#include <SlopeRZ.h>

Inheritance diagram for SLOPERZ_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 (SLOPERZ_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 &innerHit)
	value calculates the slope in R-Z for a given pair of hits.

Static Public Attributes
static const size_t	c_Nargs
	Number of arguments.

Detailed Description

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

This is the specialization for SpacePoints with returning floats, where value calculates the slope in R-Z for a given pair of hits.

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

Definition at line 27 of file SlopeRZ.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()

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

inlinestatic

value calculates the slope in R-Z for a given pair of hits.

Definition at line 34 of file SlopeRZ.h.

    {
      double result = atan(
                        sqrt(std::pow(double(outerHit.X() - innerHit.X()), 2)
                             + std::pow(double(outerHit.Y() - innerHit.Y()), 2)
                            ) / double(outerHit.Z() - innerHit.Z())
                      );
      // atan also returns negative angles, so map back to [0,Pi] otherwise one get two peaks at +/-Pi/2 for 90 degree angles
      if (result < 0.0) result += M_PI;
 
      // TODO: check if 0 is a good default return value in the case z_i==z_o!
      return (std::isnan(result) || std::isinf(result)) ? double(0) : result;
    }

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/twoHitVariables/include/SlopeRZ.h