The class 'TwoHitFilters' bundles filter methods using 2 hits which are stored in B2Vector3Ds. More...

#include <TwoHitFilters.h>

Public Member Functions
	TwoHitFilters ()
	Empty constructor.

	TwoHitFilters (const B2Vector3D &outerHit, const B2Vector3D &innerHit)
	Constructor.

	~TwoHitFilters ()
	Destructor.

void	resetValues (const B2Vector3D &outerHit, const B2Vector3D &innerHit)
	Overrides Constructor-Setup.

double	calcDist3D () const
	calculates the distance between the hits (3D), returning unit: cm^2 for speed optimization

double	fullDist3D () const
	calculates the real distance between the hits (3D), returning unit: cm

double	calcDistXY () const
	calculates the distance between the hits (XY), returning unit: cm^2 for speed optimization

double	fullDistXY () const
	calculates the real distance between the hits (XY), returning unit: cm

double	calcDistZ () const
	calculates the distance between the hits (Z only), returning unit: cm

double	calcSlopeRZ () const
	calculates the angle of the slope of the hits in RZ, returnValue = theta = atan(r/z)

double	fullSlopeRZ () const
	calculates the angle of the slope of the hits in RZ, returnValue = theta = atan(r/z)

double	calcNormedDist3D () const
	calculates the normed distance between the hits (3D), return unit: none

double	filterNan (double value) const
	nice little nanChecker returns 0 if value was nan or inf, else returns value itself

Protected Member Functions
void	initializeMe (const B2Vector3D &outerHit, const B2Vector3D &innerHit)
	initializer function, sets values

Protected Attributes
B2Vector3D	m_hitA
	outer hit (position relevant for useful filter calculation, e.g.

B2Vector3D	m_hitB
	inner hit (position relevant for useful filter calculation, e.g.

double	m_x2
	internal intermediate value storing x^2, no enduser-relevance

double	m_y2
	internal intermediate value storing y^2, no enduser-relevance

double	m_z2
	internal intermediate value storing z^2, no enduser-relevance

double	m_dz
	internal intermediate value storing distance in z, no enduser-relevance

Detailed Description

The class 'TwoHitFilters' bundles filter methods using 2 hits which are stored in B2Vector3Ds.

Definition at line 22 of file TwoHitFilters.h.

Constructor & Destructor Documentation

◆ TwoHitFilters() [1/2]

TwoHitFilters ( )

inline

Empty constructor.

For pre-inizialisation only, an object generated this way is useless unless resetValues(a, b) is called at least once

Definition at line 26 of file TwoHitFilters.h.

                   :
      m_x2(0.),
      m_y2(0.),
      m_z2(0.),
      m_dz(0.)
    {
      m_hitA.SetXYZ(0., 0., 0.);
      m_hitB.SetXYZ(0., 0., 0.);
    }

◆ TwoHitFilters() [2/2]

TwoHitFilters	(	const B2Vector3D &	outerHit,
		const B2Vector3D &	innerHit
	)

inline

Constructor.

needs the first parameter is outer hit, second is inner hit. Parameters in B2Vector3D-format

Definition at line 37 of file TwoHitFilters.h.

                                                                         :
      m_hitA(outerHit),
      m_hitB(innerHit) { initializeMe(outerHit, innerHit); }

◆ ~TwoHitFilters()

~TwoHitFilters ( )

inline

Destructor.

Definition at line 43 of file TwoHitFilters.h.

43{}

Member Function Documentation

◆ calcDist3D()

double calcDist3D ( ) const

inline

calculates the distance between the hits (3D), returning unit: cm^2 for speed optimization

Definition at line 55 of file TwoHitFilters.h.

55{ return (m_x2 + m_y2 + m_z2); } // return unit: cm^2

◆ calcDistXY()

double calcDistXY ( ) const

inline

calculates the distance between the hits (XY), returning unit: cm^2 for speed optimization

Definition at line 61 of file TwoHitFilters.h.

61{ return (m_x2 + m_y2); } // return unit: cm^2

◆ calcDistZ()

double calcDistZ ( ) const

inline

calculates the distance between the hits (Z only), returning unit: cm

Definition at line 67 of file TwoHitFilters.h.

67{ return m_dz; } // return unit: cm

◆ calcNormedDist3D()

double calcNormedDist3D ( ) const

inline

calculates the normed distance between the hits (3D), return unit: none

Definition at line 81 of file TwoHitFilters.h.

    {
      double normedVal = calcDistXY() / calcDist3D();
      return filterNan(normedVal);
    } // return unit: none

◆ calcSlopeRZ()

double calcSlopeRZ ( ) const

inline

calculates the angle of the slope of the hits in RZ, returnValue = theta = atan(r/z)

Definition at line 70 of file TwoHitFilters.h.

    {
      //double slope = atan (calcDistXY() / m_dz) ;
      double slope = atan(fullDistXY() / m_dz) ;    //since calcDistXY() returns cm ^2
      return filterNan(slope);
    } // return unit: radians

◆ filterNan()

double filterNan ( double value ) const

nice little nanChecker returns 0 if value was nan or inf, else returns value itself

Definition at line 14 of file TwoHitFilters.cc.

{
  if (std::isnan(value) == true) { return 0; }
  if (std::isinf(value) == true) { return 0; }
  return value;
}

◆ fullDist3D()

double fullDist3D ( ) const

inline

calculates the real distance between the hits (3D), returning unit: cm

Definition at line 58 of file TwoHitFilters.h.

58{ return sqrt(calcDist3D()); } // return unit: cm

Belle2::sqrt

double sqrt(double a)

sqrt for double

Definition: beamHelpers.h:28

◆ fullDistXY()

double fullDistXY ( ) const

inline

calculates the real distance between the hits (XY), returning unit: cm

Definition at line 64 of file TwoHitFilters.h.

64{ return sqrt(calcDistXY()); } // return unit: cm

◆ fullSlopeRZ()

double fullSlopeRZ ( ) const

inline

calculates the angle of the slope of the hits in RZ, returnValue = theta = atan(r/z)

Definition at line 78 of file TwoHitFilters.h.

78{ return calcSlopeRZ(); }

Belle2::TwoHitFilters::calcSlopeRZ

double calcSlopeRZ() const

calculates the angle of the slope of the hits in RZ, returnValue = theta = atan(r/z)

Definition: TwoHitFilters.h:70

◆ initializeMe()

void initializeMe	(	const B2Vector3D &	outerHit,
		const B2Vector3D &	innerHit
	)

inlineprotected

initializer function, sets values

Definition at line 93 of file TwoHitFilters.h.

    {
      m_x2 = outerHit[0] - innerHit[0]; // not x2 yet, reusing member
      m_y2 = outerHit[1] - innerHit[1];
      m_dz = outerHit[2] - innerHit[2];
 
      m_x2 *= m_x2; // now it's x2...
      m_y2 *= m_y2;
      m_z2 = m_dz * m_dz;
    }

◆ resetValues()

void resetValues	(	const B2Vector3D &	outerHit,
		const B2Vector3D &	innerHit
	)

inline

Overrides Constructor-Setup.

Needed if you want to reuse the instance instead of recreating one

Definition at line 46 of file TwoHitFilters.h.

    {
      m_hitA = outerHit;
      m_hitB = innerHit;
 
      initializeMe(outerHit, innerHit);
    }

Member Data Documentation

◆ m_dz

double m_dz

protected

internal intermediate value storing distance in z, no enduser-relevance

Definition at line 111 of file TwoHitFilters.h.

◆ m_hitA

B2Vector3D m_hitA

protected

outer hit (position relevant for useful filter calculation, e.g.

calcDist3D) used for the filter calculation

Definition at line 105 of file TwoHitFilters.h.

◆ m_hitB

B2Vector3D m_hitB

protected

inner hit (position relevant for useful filter calculation, e.g.

calcDist3D) used for the filter calculation

Definition at line 107 of file TwoHitFilters.h.

◆ m_x2

double m_x2

protected

internal intermediate value storing x^2, no enduser-relevance

Definition at line 108 of file TwoHitFilters.h.

◆ m_y2

double m_y2

protected

internal intermediate value storing y^2, no enduser-relevance

Definition at line 109 of file TwoHitFilters.h.

◆ m_z2

double m_z2

protected

internal intermediate value storing z^2, no enduser-relevance

Definition at line 110 of file TwoHitFilters.h.

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

tracking/vxdCaTracking/include/TwoHitFilters.h
tracking/vxdCaTracking/src/TwoHitFilters.cc

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ TwoHitFilters() [1/2]

◆ TwoHitFilters() [2/2]

◆ ~TwoHitFilters()

Member Function Documentation

◆ calcDist3D()

◆ calcDistXY()

◆ calcDistZ()

◆ calcNormedDist3D()

◆ calcSlopeRZ()

◆ filterNan()

◆ fullDist3D()

◆ fullDistXY()

◆ fullSlopeRZ()

◆ initializeMe()

◆ resetValues()

Member Data Documentation

◆ m_dz

◆ m_hitA

◆ m_hitB

◆ m_x2

◆ m_y2

◆ m_z2