Class that allows the calculation of simple variables to estimate the quality of a triplet of hits. More...

#include <ThreeHitVariables.h>

Collaboration diagram for ThreeHitVariables:

Public Member Functions
	ThreeHitVariables ()
	basic constructor

	ThreeHitVariables (const B2Vector3D &oHit, const B2Vector3D &cHit, const B2Vector3D &iHit)
	actual useful constructor More...

void	setHits (const B2Vector3D &oHit, const B2Vector3D &cHit, const B2Vector3D &iHit)
	Set hits if not given in constructor of if they need to be changed. More...

double	calcAvgDistanceXY (const B2Vector3D &circleCenter)
	helper function which calculates the average distance in XY from the given center More...

double	getAngle3D ()
	calculates the angle between the hits/vectors (3D), returning unit: angle in radian

double	getAngle3DSimple ()
	calculates the angle between the hits/vectors (3D), returning unit: none (calculation for degrees is incomplete, if you want readable numbers, use Angle3DFull instead)

double	getAngleRZ ()
	calculates the angle between the hits/vectors (RZ), returning unit: angle in radian

double	getCosAngleRZSimple ()
	calculates the cosine of the angle between the hits/vectors (RZ), returning unit: none (calculation for degrees is incomplete, if you want readable numbers, use AngleRZFull instead)

double	getAngleXY ()
	Calculates the angle in x-y between two vectors return unit: rad (0 - pi)

B2Vector3D	getCircleCenterXY ()
	calculates an estimation of circleCenter position, result is returned as the x and y value of the B2Vector3.

double	getCircleDistanceIP ()
	calculates the distance of the point of closest approach of circle to the IP, returning unit: cm

double	getCircleRadius ()
	calculates the estimation of the circle radius of the 3-hit-tracklet, returning unit: cm.

double	getCosAngleXY ()
	calculates the angle between the hits/vectors (XY), returning unit: none (calculation for degrees is incomplete, if you want readable numbers, use AngleXYFull instead)

double	getDeltaSlopeRZ ()
	calculates deviations in the slope of the inner segment and the outer segment, returning unit: none

double	getDeltaSlopeZoverS ()
	compares the "slopes" z over arc length. calcDeltaSlopeZOverS is invariant under rotations in the r-z plane.

double	getDeltaSoverZ ()
	calculates the helixparameter describing the deviation in arc length per unit in z. returning unit: radians*cm

double	performHelixParamterFit ()
	calculates the helixparameter describing the deviation in z per unit angle, returning unit: none

double	getSimplePTEstimate ()
	calculates the estimation of the transverse momentum of the 3-hit-tracklet, returning unit: GeV/c

int	getCurvatureSign ()
	calculates calculates the sign of the curvature of given 3-hit-tracklet. More...

int	getCurvatureSign (const B2Vector3D &oHit, const B2Vector3D &cHit, const B2Vector3D &iHit)
	calculates calculates the sign of the curvature of 3-hit-tracklet given as arguments. More...

void	setBFieldZ (const double bfieldZ=1.5)
	Set the B-Field value used for pT calculations. More...

Private Attributes
double	m_BFieldZ = 1.5
	BField along z to estimate pT.

B2Vector3D	m_oHit
	outermost hit position

B2Vector3D	m_cHit
	center hit position

B2Vector3D	m_iHit
	innermost hit position

B2Vector3D	m_outerDifferenceVector
	The following two differences are used very often, so calculate once on construction vector containing the difference m_oHit - m_cHit.

B2Vector3D	m_innerDifferenceVector
	vector containing the difference m_cHit - m_iHit

Detailed Description

Class that allows the calculation of simple variables to estimate the quality of a triplet of hits.

Definition at line 25 of file ThreeHitVariables.h.

Constructor & Destructor Documentation

◆ ThreeHitVariables()

ThreeHitVariables	(	const B2Vector3D &	oHit,
		const B2Vector3D &	cHit,
		const B2Vector3D &	iHit
	)

inline

actual useful constructor

Parameters

oHit	B2Vector3D of the outer hit used for calculating the single variables
cHit	B2Vector3D of the center hit used for calculating the single variables
iHit	B2Vector3D of the inner hit used for calculating the single variables

Definition at line 36 of file ThreeHitVariables.h.

                                                                                                 :
         m_oHit(oHit), m_cHit(cHit), m_iHit(iHit)
       {
         m_outerDifferenceVector = oHit - cHit;
         m_innerDifferenceVector = cHit - iHit;
       };

Member Function Documentation

◆ calcAvgDistanceXY()

double calcAvgDistanceXY ( const B2Vector3D & circleCenter )

inline

helper function which calculates the average distance in XY from the given center

Parameters

circleCenter center of the cirlce for which the average distance is calculated returns the average distance in cm of the hits to the circle center position

Definition at line 59 of file ThreeHitVariables.h.

◆ getCurvatureSign() [1/2]

int getCurvatureSign ( )

inline

calculates calculates the sign of the curvature of given 3-hit-tracklet.

A positive value represents a left-oriented curvature, a negative value means having a right-oriented curvature. 0 means that it is exactly straight or that two hits are identical.

Definition at line 286 of file ThreeHitVariables.h.

◆ getCurvatureSign() [2/2]

int getCurvatureSign	(	const B2Vector3D &	oHit,
		const B2Vector3D &	cHit,
		const B2Vector3D &	iHit
	)

inline

calculates calculates the sign of the curvature of 3-hit-tracklet given as arguments.

A positive value represents a left-oriented curvature, a negative value means having a right-oriented curvature. 0 means that it is exactly straight or that two hits are identical.

Definition at line 297 of file ThreeHitVariables.h.

◆ setBFieldZ()

void setBFieldZ ( const double bfieldZ = 1.5 )

inline

Set the B-Field value used for pT calculations.

Parameters

bfieldZ B-Field value to be used

Definition at line 307 of file ThreeHitVariables.h.

◆ setHits()

void setHits	(	const B2Vector3D &	oHit,
		const B2Vector3D &	cHit,
		const B2Vector3D &	iHit
	)

inline

Set hits if not given in constructor of if they need to be changed.

Parameters

oHit	B2Vector3D of the outer hit used for calculating the single variables
cHit	B2Vector3D of the center hit used for calculating the single variables
iHit	B2Vector3D of the inner hit used for calculating the single variables

Definition at line 47 of file ThreeHitVariables.h.

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

tracking/vxdHoughTracking/filters/pathFilters/include/ThreeHitVariables.h

Public Member Functions

Private Attributes

Detailed Description

Constructor & Destructor Documentation

◆ ThreeHitVariables()

Member Function Documentation

◆ calcAvgDistanceXY()

◆ getCurvatureSign() [1/2]

◆ getCurvatureSign() [2/2]

◆ setBFieldZ()

◆ setHits()