Acts::Neutral Struct Reference

Charge and momentum interpretation for neutral particles. More...

#include <Acts/EventData/Charge.hpp>

Public Member Functions
constexpr	Neutral ()=default
constexpr	Neutral (float absQ) noexcept
	Construct and verify the input charge magnitude (in debug builds).
constexpr float	absQ () const noexcept
	Get the absolute charge magnitude.
constexpr float	extractCharge (double) const noexcept
	Extract the signed charge from q/p.
constexpr double	extractMomentum (double qOverP) const noexcept
	Extract momentum magnitude from q/p.
constexpr double	qOverP (double momentum, float signedQ) const noexcept
	Compute q/p from momentum and signed charge.

Detailed Description

Charge and momentum interpretation for neutral particles.

Constructor & Destructor Documentation

Neutral() [1/2]

Acts::Neutral::Neutral ( )

constexprdefault

Neutral() [2/2]

Acts::Neutral::Neutral ( float absQ )

explicitconstexprnoexcept

Construct and verify the input charge magnitude (in debug builds).

This constructor is only provided to allow consistent construction.

Parameters

absQ	Absolute charge magnitude (must be zero for neutral particles)

Member Function Documentation

absQ()

float Acts::Neutral::absQ ( ) const

constexprnoexcept

Get the absolute charge magnitude.

Returns

Always returns 0 for neutral particles

extractCharge()

float Acts::Neutral::extractCharge ( double ) const

constexprnoexcept

Extract the signed charge from q/p.

Returns

Always returns 0 for neutral particles

extractMomentum()

double Acts::Neutral::extractMomentum ( double qOverP ) const

constexprnoexcept

Extract momentum magnitude from q/p.

Parameters

qOverP

Charge over momentum (must be positive for neutral particles)

Returns

Momentum magnitude calculated as 1/qOverP

qOverP()

double Acts::Neutral::qOverP ( double momentum, float signedQ ) const

constexprnoexcept

Compute q/p from momentum and signed charge.

Parameters

momentum	Particle momentum magnitude
signedQ	Signed charge (must be 0 for neutral particles)

Returns

Charge over momentum (1/momentum for neutral particles)