Acts::BetheHeitlerApproxSingleCmp Class Reference

This class approximates the Bethe-Heitler with only one component. More...

#include <Acts/TrackFitting/BetheHeitlerApprox.hpp>

Inheritance diagram for Acts::BetheHeitlerApproxSingleCmp:

Collaboration diagram for Acts::BetheHeitlerApproxSingleCmp:

Public Member Functions
std::size_t	maxComponents () const override
	Returns the number of components the returned mixture will have.
std::span< Component >	mixture (const double xOverX0, const std::span< Component > mixture) const override
	Returns array with length 1 containing a 1-component-representation of the Bethe-Heitler-Distribution.
bool	validXOverX0 (const double xOverX0) const override
	Checks if an input is valid for the parameterization.
Public Member Functions inherited from Acts::BetheHeitlerApprox
virtual	~BetheHeitlerApprox ()=default

Additional Inherited Members
Public Types inherited from Acts::BetheHeitlerApprox
using	Component = detail::GaussianComponent

Detailed Description

This class approximates the Bethe-Heitler with only one component.

This is mainly inside AtlasBetheHeitlerApprox, but can also be used as the only component approximation (then probably for debugging)

Member Function Documentation

maxComponents()

std::size_t Acts::BetheHeitlerApproxSingleCmp::maxComponents ( ) const

overridevirtual

Returns the number of components the returned mixture will have.

Returns

Number of components (always 1 for single component approximation)

Implements Acts::BetheHeitlerApprox.

mixture()

std::span< Component > Acts::BetheHeitlerApproxSingleCmp::mixture ( const double xOverX0, const std::span< Component > mixture ) const

overridevirtual

Returns array with length 1 containing a 1-component-representation of the Bethe-Heitler-Distribution.

Parameters

xOverX0	pathlength in terms of the radiation length
mixture	preallocated array to store the result

Returns

the unmodified input span containing the single component

Implements Acts::BetheHeitlerApprox.

validXOverX0()

bool Acts::BetheHeitlerApproxSingleCmp::validXOverX0 ( const double xOverX0 ) const

overridevirtual

Checks if an input is valid for the parameterization.

The threshold for x/x0 is 0.002 and orientates on the values used in ATLAS

Parameters

xOverX0

The x/x0 value to check

Returns

True if x/x0 is below the threshold for single component approximation

Implements Acts::BetheHeitlerApprox.