Acts::AngleHelpers Namespace Reference

Classes
struct	EtaThetaConversionTraits
struct	EtaThetaConversionTraits< double >
struct	EtaThetaConversionTraits< float >

Functions
template<typename Scalar>
Scalar	etaFromTheta (Scalar theta)
	Calculate the pseudorapidity from the polar angle theta.
template<typename Scalar>
Scalar	thetaFromEta (Scalar eta)
	Calculate the polar angle theta from the pseudorapidity.

Function Documentation

etaFromTheta()

template<typename Scalar>

Scalar Acts::AngleHelpers::etaFromTheta

(

Scalar

theta

)

Calculate the pseudorapidity from the polar angle theta.

This function aims to be FPE safe and returns infinity for theta values outside the floating point precision range.

Parameters

theta

is the polar angle in radian towards the z-axis.

Returns

the pseudorapidity towards the z-axis.

thetaFromEta()

template<typename Scalar>

Scalar Acts::AngleHelpers::thetaFromEta

(

Scalar

eta

)

Calculate the polar angle theta from the pseudorapidity.

This function aims to be FPE safe and returns 0/pi for eta values outside the floating point precision range.

Parameters

eta	is the pseudorapidity towards the z-axis.

Returns

the polar angle in radian towards the z-axis.