Template Class TrackDensityVertexFinder

Nested Relationships

Nested Types

Class Documentation

template<typename vfitter_t, typename track_density_t = GaussianTrackDensity<typename vfitter_t::InputTrack_t>>
class Acts::TrackDensityVertexFinder

Finds a vertex seed based on the maximum of a track density function.

Each track is modelled as a 2d density function around its d0/z0 perigee parameter values. The z seed position is then found as the position of the maximum of all summed track density functions.

Ref. (1): https://cds.cern.ch/record/2670380

Template Parameters

  • vfitter_t: The vertex fitter type (needed to fulfill concept)

  • track_density_t: The track density type

Public Functions

template<typename T = InputTrack_t, std::enable_if_t<std::is_same<T, BoundTrackParameters>::value, int> = 0>
TrackDensityVertexFinder(const Config &cfg)

Constructor used if InputTrack_t type == BoundTrackParameters.

Parameters

  • cfg: Configuration object

template<typename T = InputTrack_t, std::enable_if_t<std::is_same<T, BoundTrackParameters>::value, int> = 0>
TrackDensityVertexFinder()

Default constructor used if InputTrack_t type == BoundTrackParameters.

TrackDensityVertexFinder(const Config &cfg, const std::function<BoundTrackParameters(InputTrack_t)> &func)

Constructor for user-defined InputTrack_t type =! BoundTrackParameters.

Parameters

  • cfg: Configuration object

  • func: Function extracting BoundTrackParameters from InputTrack_t object

TrackDensityVertexFinder(const std::function<BoundTrackParameters(InputTrack_t)> &func)

Constructor for user-defined InputTrack_t type =! BoundTrackParameters with default Config object.

Parameters

  • func: Function extracting BoundTrackParameters from InputTrack_t object

Result<std::vector<Vertex<InputTrack_t>>> find(const std::vector<const InputTrack_t*> &trackVector, const VertexingOptions<InputTrack_t> &vertexingOptions, State &state) const

Function that finds single vertex candidate.

Return

Vector of vertices, filled with a single vertex (for consistent interfaces)

Parameters

  • trackVector: Input track collection

  • vertexingOptions: Vertexing options

  • state: State for fulfilling interfaces

struct Config

The Config struct.

Public Members

track_density_t trackDensityEstimator
struct State

for fulfilling interface