SelVarHelper< PointType, DataType > Struct Template Reference

contains a collection of functions and related stuff needed for SelectionVariables implementing 2-, 3- and 4-hitfilters. More...

#include <SelectionVariableHelper.h>

Static Public Member Functions
static void	resetMagneticField (DataType magneticFieldStrength=1.5)
	Overrides standard-Setup for magnetic field. More...
static DataType	calcPerp2 (const PointType &aHit)
	returns the perpendicular magnitude squared of given pointType.
static DataType	calcPerp (const PointType &aHit)
	returns the perpendicular magnitude of given pointType.
static DataType	calcMag2 (const PointType &aHit)
	returns the magnitude squared of given pointType.
static DataType	calcMag (const PointType &aHit)
	returns the magnitude of given pointType.
static DataType	calcDot (const PointType &aHit, const PointType &bHit)
	returns scalar product of given two pointTypes.
static DataType	calcPt (DataType radius, DataType field=SelVarHelper::s_MagneticFieldFactor)
	calculates the estimation of the transverse momentum of given radius using defined strength of magnetic field, returning unit: GeV/c.

Static Public Attributes
static DataType	s_MagneticFieldFactor
	is factor containing speed of light (c), the magnetic field (b) and the scaling factor s for conversion of meter in cm : c*b/100 = c*b*s. More...

Detailed Description

template<class PointType, class DataType>
struct Belle2::SelVarHelper< PointType, DataType >

contains a collection of functions and related stuff needed for SelectionVariables implementing 2-, 3- and 4-hitfilters.

Template PointType expects a class having the functions X(), Y() and Z() returning Datatype. Template DataType should behave like a primitive like double or float.

Definition at line 21 of file SelectionVariableHelper.h.

Member Function Documentation

resetMagneticField()

static void resetMagneticField ( DataType  magneticFieldStrength = 1.5 )

inlinestatic

Overrides standard-Setup for magnetic field.

If no value is given, magnetic field is assumed to be Belle2-Detector standard of 1.5T. pT[GeV/c] = 0.299710*B[T]*r[m] = 0.299710*B[T]*r[cm]/100 = 0.00299710B[T]*r[cm].

Definition at line 37 of file SelectionVariableHelper.h.

{ SelVarHelper::s_MagneticFieldFactor = magneticFieldStrength * 0.00299710; }

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

• tracking/trackFindingVXD/filterTools/include/SelectionVariableHelper.h