org.lcsim.fit.helicaltrack

Class HelixParamCalculator

java.lang.Object

org.lcsim.fit.helicaltrack.HelixParamCalculator

public class HelixParamCalculator
extends Object

Class used for calculating MC particle track paramters

Author:

Pelham Keahey

Field Summary

Fields

Modifier and Type	Field and Description
private double	arclength
private double	mcdca
private double	mcphi0
private double	p
private double	pt
private double	R
private double	tanL
private double	theta
private double	x0
private double	y0
private double	z0

Constructor Summary

Constructors

Constructor and Description
HelixParamCalculator(Hep3Vector momentum, Hep3Vector origin, int charge, double BField)
HelixParamCalculator(MCParticle mcp, double BField) Constructor that is fed a magnetic field and MCPARTICLE
HelixParamCalculator(MCParticle mcpc, EventHeader eventc) Calculates the B-Field from event

Method Summary

Methods

Modifier and Type	Method and Description
double	getArcLength() Return the arclength of the helix from the ORIGIN TO THE DCA
double	getDCA() Return the distance of closest approach
double	getMCMomentum() Return the particle's momentum
double	getMCOmega() Return the curvature (omega)
double	getMCTransverseMomentum() Return the transvers momentum of the MC particle, Pt
double	getPhi0() Return the azimuthal angle of the momentum when at the position of closest approach
double	getRadius() Return the radius of the Helix track
double	getSlopeSZPlane() Return the slope of the helix in the SZ plane, tan(lambda)
double	getTheta() Return the theta angle for the projection of the helix in the SZ plane from the z axis
double	getX0() Return the x position of the particle when at the dca
double	getY0() Return the y position of the particle at the dca
double	getZ0() Return the z position at the distance of closest approach

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

R

private double R

p

private double p

pt

private double pt

theta

private double theta

arclength

private double arclength

mcdca

private double mcdca

mcphi0

private double mcphi0

tanL

private double tanL

z0

private double z0

x0

private double x0

y0

private double y0

Constructor Detail

HelixParamCalculator

public HelixParamCalculator(MCParticle mcp,
                    double BField)

Constructor that is fed a magnetic field and MCPARTICLE

Parameters:

mcpc -

cBField -

HelixParamCalculator

public HelixParamCalculator(Hep3Vector momentum,
                    Hep3Vector origin,
                    int charge,
                    double BField)

HelixParamCalculator

public HelixParamCalculator(MCParticle mcpc,
                    EventHeader eventc)

Calculates the B-Field from event

Parameters:

mcpc -

eventc -

Method Detail

getRadius

public double getRadius()

Return the radius of the Helix track

Returns:

double R

getTheta

public double getTheta()

Return the theta angle for the projection of the helix in the SZ plane from the z axis

Returns:

double theta

getMCMomentum

public double getMCMomentum()

Return the particle's momentum

Returns:

double mcp momentum

getMCOmega

public double getMCOmega()

Return the curvature (omega)

Returns:

double omega

getMCTransverseMomentum

public double getMCTransverseMomentum()

Return the transvers momentum of the MC particle, Pt

Returns:

double Pt

getSlopeSZPlane

public double getSlopeSZPlane()

Return the slope of the helix in the SZ plane, tan(lambda)

Returns:

double tanL

getDCA

public double getDCA()

Return the distance of closest approach

Returns:

double mcdca

getPhi0

public double getPhi0()

Return the azimuthal angle of the momentum when at the position of closest approach

Returns:

double mcphi0

getZ0

public double getZ0()

Return the z position at the distance of closest approach

Returns:

double z0 position

getArcLength

public double getArcLength()

Return the arclength of the helix from the ORIGIN TO THE DCA

Returns:

double arclength

getX0

public double getX0()

Return the x position of the particle when at the dca

Returns:

double arclength

getY0

public double getY0()

Return the y position of the particle at the dca

Returns:

double arclength