Template Struct FreeParametersSmearer

Struct Documentation

template<typename generator_t, size_t kSize>
struct ActsFatras::FreeParametersSmearer

Uncorrelated smearing algorithm for fast digitisation of free parameters.

The smearer takes a single simulated

Hit and generates a smeared parameter vector and associated covariance matrix.
Template Parameters

  • generator_t: Random number generator type

  • kSize: Number of smeared parameters

Note

Uncorrelated smearing of the direction using each components individually is not recommended

Public Types

using CovarianceMatrix = Acts::ActsSymMatrix<kSize>
using ParametersVector = Acts::ActsVector<kSize>
using Result = Acts::Result<std::pair<ParametersVector, CovarianceMatrix>>
using Scalar = Acts::ActsScalar

Public Functions

Result operator()(generator_t &rng, const Hit &hit) const

Generate smeared measured for configured parameters.

Return

Smeared free parameter set wrapped in a Result<…> object

Parameters

  • rng: Random number generator

  • hit: Simulated hit

Return Value

  • Smeared: parameters vector and associated covariance on success

  • Error: code for failure

Public Members

std::array<Acts::FreeIndices, kSize> indices

Parameter indices that will be used to create the smeared measurements.

std::array<SingleParameterSmearFunction<generator_t>, kSize> smearFunctions

Public Static Functions

constexpr size_t size()