This class contains the measured values of the orientation of the collision axis in the CM system obtained by pure Lorentz boost angleXZ = atan(pHERcms.X / pHERcms.Z) angleYZ = atan(pHERcms.Y / pHERcms.Z) where pHERcms is HER momentum in CM system obtained by boost. More...

#include <CollisionAxisCMS.h>

Inheritance diagram for CollisionAxisCMS:

Public Member Functions
bool	operator== (const CollisionAxisCMS &other) const
	equality operator

void	setAngles (double angleXZ, double angleYZ, const TMatrixDSym &centerCovariance)
	Set the central values and uncertainty of them.

void	setSpread (const TMatrixDSym &spreadCovariance, double spreadXZunc, double spreadYZunc, double spreadPhiUnc)
	Set spread covariance and uncertainties of the eigenvalues of this matrix.

double	getAngleXZ () const
	Get the mean XZ angle of the HER beam in the CM frame obtained by pure boost.

double	getAngleYZ () const
	Get the mean YZ angle of the HER beam in the CM frame obtained by pure boost.

const TMatrixDSym &	getCenterCovariance () const
	Get the covariance matrix describing uncertainties of m_angleXZ and m_angleYZ.

const TMatrixDSym &	getSpreadCovariance () const
	Get the covariance matrix describing "natural" spread of angleXZ and angleYZ.

double	getSpreadXZunc () const
	Get the uncertainty of the eigenvalue of m_spreadCovariance corresponding to eigenvector closer to x-axis

double	getSpreadYZunc () const
	Get the uncertainty of the eigenvalue of m_spreadCovariance corresponding to eigenvector closer to y-axis

double	getSpreadPhiUnc () const
	Get the uncertainty of the angle of the eigenvector of m_spreadCovariance.

Private Member Functions
	ClassDef (CollisionAxisCMS, 1)
	direction of collision axis in CMS and its spread

Private Attributes
double	m_angleXZ
	the XZ angle of the HER beam in the CM system obtained by pure boost

double	m_angleYZ
	the YZ angle of the HER beam in the CM system obtained by pure boost

TMatrixDSym	m_centerCovariance {2}
	Covariance matrix describing uncertainties of m_angleXZ and m_angleYZ.

TMatrixDSym	m_spreadCovariance {2}
	Covariance matrix describing "natural" spread of m_angleXZ and m_angleYZ.

double	m_spreadXZunc
	Uncertainty of the eigenvalue of m_spreadCovariance corresponding to eigenvector closer to x-axis.

double	m_spreadYZunc
	Uncertainty of the eigenvalue of m_spreadCovariance corresponding to eigenvector closer to y-axis.

double	m_spreadPhiUnc
	Uncertainty of the angle of the eigenvector of m_spreadCovariance.

Detailed Description

This class contains the measured values of the orientation of the collision axis in the CM system obtained by pure Lorentz boost angleXZ = atan(pHERcms.X / pHERcms.Z) angleYZ = atan(pHERcms.Y / pHERcms.Z) where pHERcms is HER momentum in CM system obtained by boost.

These angles do not have sharp value, but vary event-by-event due to the spread of HER/LER momenta. Therefore, both central values and spread are stored together with the uncertainties.

This class is needed for Lorentz transformation to the standard CM system, where particles collide along z-axis.

Definition at line 27 of file CollisionAxisCMS.h.

Member Function Documentation

◆ getAngleXZ()

double getAngleXZ ( ) const

inline

Get the mean XZ angle of the HER beam in the CM frame obtained by pure boost.

Definition at line 57 of file CollisionAxisCMS.h.

57{ return m_angleXZ; }

Belle2::CollisionAxisCMS::m_angleXZ

double m_angleXZ

the XZ angle of the HER beam in the CM system obtained by pure boost

Definition: CollisionAxisCMS.h:81

◆ getAngleYZ()

double getAngleYZ ( ) const

inline

Get the mean YZ angle of the HER beam in the CM frame obtained by pure boost.

Definition at line 60 of file CollisionAxisCMS.h.

60{ return m_angleYZ; }

Belle2::CollisionAxisCMS::m_angleYZ

double m_angleYZ

the YZ angle of the HER beam in the CM system obtained by pure boost

Definition: CollisionAxisCMS.h:82

◆ getCenterCovariance()

const TMatrixDSym & getCenterCovariance ( ) const

inline

Get the covariance matrix describing uncertainties of m_angleXZ and m_angleYZ.

Definition at line 64 of file CollisionAxisCMS.h.

64{ return m_centerCovariance; }

Belle2::CollisionAxisCMS::m_centerCovariance

TMatrixDSym m_centerCovariance

Covariance matrix describing uncertainties of m_angleXZ and m_angleYZ.

Definition: CollisionAxisCMS.h:85

◆ getSpreadCovariance()

const TMatrixDSym & getSpreadCovariance ( ) const

inline

Get the covariance matrix describing "natural" spread of angleXZ and angleYZ.

Definition at line 67 of file CollisionAxisCMS.h.

67{ return m_spreadCovariance; }

Belle2::CollisionAxisCMS::m_spreadCovariance

TMatrixDSym m_spreadCovariance

Covariance matrix describing "natural" spread of m_angleXZ and m_angleYZ.

Definition: CollisionAxisCMS.h:88

◆ getSpreadPhiUnc()

double getSpreadPhiUnc ( ) const

inline

Get the uncertainty of the angle of the eigenvector of m_spreadCovariance.

Definition at line 76 of file CollisionAxisCMS.h.

76{ return m_spreadPhiUnc; }

Belle2::CollisionAxisCMS::m_spreadPhiUnc

double m_spreadPhiUnc

Uncertainty of the angle of the eigenvector of m_spreadCovariance.

Definition: CollisionAxisCMS.h:93

◆ getSpreadXZunc()

double getSpreadXZunc ( ) const

inline

Get the uncertainty of the eigenvalue of m_spreadCovariance corresponding to eigenvector closer to x-axis

Definition at line 70 of file CollisionAxisCMS.h.

70{ return m_spreadXZunc; }

Belle2::CollisionAxisCMS::m_spreadXZunc

double m_spreadXZunc

Uncertainty of the eigenvalue of m_spreadCovariance corresponding to eigenvector closer to x-axis.

Definition: CollisionAxisCMS.h:91

◆ getSpreadYZunc()

double getSpreadYZunc ( ) const

inline

Get the uncertainty of the eigenvalue of m_spreadCovariance corresponding to eigenvector closer to y-axis

Definition at line 73 of file CollisionAxisCMS.h.

73{ return m_spreadYZunc; }

Belle2::CollisionAxisCMS::m_spreadYZunc

double m_spreadYZunc

Uncertainty of the eigenvalue of m_spreadCovariance corresponding to eigenvector closer to y-axis.

Definition: CollisionAxisCMS.h:92

◆ operator==()

bool operator== ( const CollisionAxisCMS & other ) const

inline

equality operator

Definition at line 31 of file CollisionAxisCMS.h.

    {
      return other.m_angleXZ == m_angleXZ && other.m_angleYZ == m_angleYZ &&
             other.m_centerCovariance == m_centerCovariance && other.m_spreadCovariance == m_spreadCovariance &&
             other.m_spreadXZunc == m_spreadXZunc && other.m_spreadYZunc == m_spreadYZunc && other.m_spreadPhiUnc == m_spreadPhiUnc;
    }

◆ setAngles()

void setAngles	(	double	angleXZ,
		double	angleYZ,
		const TMatrixDSym &	centerCovariance
	)

inline

Set the central values and uncertainty of them.

Definition at line 39 of file CollisionAxisCMS.h.

    {
      m_angleXZ = angleXZ;
      m_angleYZ = angleYZ;
      m_centerCovariance = centerCovariance;
    }

◆ setSpread()

void setSpread	(	const TMatrixDSym &	spreadCovariance,
		double	spreadXZunc,
		double	spreadYZunc,
		double	spreadPhiUnc
	)

inline

Set spread covariance and uncertainties of the eigenvalues of this matrix.

Definition at line 47 of file CollisionAxisCMS.h.

    {
      m_spreadCovariance = spreadCovariance;
      m_spreadXZunc  = spreadXZunc;
      m_spreadYZunc  = spreadYZunc;
      m_spreadPhiUnc = spreadPhiUnc;
    }

Member Data Documentation

◆ m_angleXZ

double m_angleXZ

private

the XZ angle of the HER beam in the CM system obtained by pure boost

Definition at line 81 of file CollisionAxisCMS.h.

◆ m_angleYZ

double m_angleYZ

private

the YZ angle of the HER beam in the CM system obtained by pure boost

Definition at line 82 of file CollisionAxisCMS.h.

◆ m_centerCovariance

TMatrixDSym m_centerCovariance {2}

private

Covariance matrix describing uncertainties of m_angleXZ and m_angleYZ.

Definition at line 85 of file CollisionAxisCMS.h.

◆ m_spreadCovariance

TMatrixDSym m_spreadCovariance {2}

private

Covariance matrix describing "natural" spread of m_angleXZ and m_angleYZ.

Definition at line 88 of file CollisionAxisCMS.h.

◆ m_spreadPhiUnc

double m_spreadPhiUnc

private

Uncertainty of the angle of the eigenvector of m_spreadCovariance.

Definition at line 93 of file CollisionAxisCMS.h.

◆ m_spreadXZunc

double m_spreadXZunc

private

Uncertainty of the eigenvalue of m_spreadCovariance corresponding to eigenvector closer to x-axis.

Definition at line 91 of file CollisionAxisCMS.h.

◆ m_spreadYZunc

double m_spreadYZunc

private

Uncertainty of the eigenvalue of m_spreadCovariance corresponding to eigenvector closer to y-axis.

Definition at line 92 of file CollisionAxisCMS.h.

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

mdst/dbobjects/include/CollisionAxisCMS.h

Public Member Functions

Private Member Functions

Private Attributes

Detailed Description

Member Function Documentation

◆ getAngleXZ()

◆ getAngleYZ()

◆ getCenterCovariance()

◆ getSpreadCovariance()

◆ getSpreadPhiUnc()

◆ getSpreadXZunc()

◆ getSpreadYZunc()

◆ operator==()

◆ setAngles()

◆ setSpread()

Member Data Documentation

◆ m_angleXZ

◆ m_angleYZ

◆ m_centerCovariance

◆ m_spreadCovariance

◆ m_spreadPhiUnc

◆ m_spreadXZunc

◆ m_spreadYZunc