Class Acts::GenericParticleHypothesis

template<ACTS_CONCEPT charge_t(ChargeConcept)>
class GenericParticleHypothesis

Particle hypothesis used in reconstruction.

The reconstruction hypothesis consists of absolute PDG code, mass and absolute charge.

Public Types

using ChargeType = charge_t

Public Functions

inline constexpr GenericParticleHypothesis(PdgParticle absPdg, float mass, ChargeType chargeType)

Creates a particle hypothesis using absolute PDG, mass and the charge type.

Parameters

  • absPdg – the absolute PDG

  • mass – the particle mass

  • chargeType – the type of charge

inline GenericParticleHypothesis(PdgParticle absPdg)

Creates a particle hypothesis using the absolute PDG.

The mass and charge is looked up using findMass and findCharge. If the lookup fails an exception is thrown.

Parameters

absPdg – the absolute PDG

template<typename other_charge_t>
inline constexpr GenericParticleHypothesis(const GenericParticleHypothesis<other_charge_t> &other)

Copy from another charge hypothesis.

Note

This enables implicit conversion.

inline constexpr float absoluteCharge() const noexcept

Get the hypothesized absolute charge.

inline constexpr PdgParticle absPdg() const noexcept

Get the hypothesized absolute PDG.

inline constexpr const ChargeType &chargeType() const noexcept

Get the hypothesized charge type.

template<typename T>
inline constexpr auto extractCharge(T qOverP) const noexcept

Extracts the signed charge from the q over p track parameter using the charge hypothesis.

Parameters

qOverP – the q over p track parameter.

template<typename T>
inline constexpr auto extractMomentum(T qOverP) const noexcept

Extracts the signed charge from the q over p track parameter using the charge hypothesis.

Parameters

qOverP – the q over p track parameter.

inline constexpr float mass() const noexcept

Get the hypothesized mass.

template<typename P, typename Q>
inline constexpr auto qOverP(P momentum, Q signedQ) const noexcept

Calculate the q over p track parameter with the given absolute momentum and charge.

Parameters

  • momentum – the absolute momentum.

  • signedQ – the signed charge.