Acts::HoughVertexFinder< spacepoint_t > Class Template Reference

Implements the vertex finder based on the spacepoints using Hough transform For more information, see arXiv:2410.14494 0. More...

#include <Acts/Vertexing/HoughVertexFinder.hpp>

Classes
struct	Config
	Configuration struct. More...

Public Types
using	HoughAxis = Axis<AxisType::Equidistant, AxisBoundaryType::Open>
	Type alias for equidistant axis used in Hough transform.
using	HoughCount_t = std::uint16_t
	Type alias for count values in Hough histogram bins.
using	HoughHist = Grid<HoughCount_t, HoughAxis, HoughAxis>
	Type alias for 2D histogram used in Hough transform.

Public Member Functions
	HoughVertexFinder (Config cfg, std::unique_ptr< const Logger > lgr=getDefaultLogger("HoughVertexFinder", Logging::INFO))
	Constructor.
const Config &	config () const
	Const access to the config.
Acts::Result< Acts::Vector3 >	find (const std::vector< spacepoint_t > &spacepoints) const
	Finds the vertex based on the provided spacepoints.

Detailed Description

template<typename spacepoint_t>
class Acts::HoughVertexFinder< spacepoint_t >

Implements the vertex finder based on the spacepoints using Hough transform For more information, see arXiv:2410.14494 0.

Assumes there is only 1 vertex and that it has a high multiplicity

1. Estimates what eta range is really necessary
2. Creates Hough space (z_vtx - cot(theta)) from spacepoints within that eta range
3. Subtracts the coincidentally crossed lines in the Hough space
4. Makes a projection to the Z axis and finds a peak - that is the vertex position
5. Repeats 2-4 if necessary

Member Typedef Documentation

HoughAxis

template<typename spacepoint_t>

using Acts::HoughVertexFinder< spacepoint_t >::HoughAxis = Axis<AxisType::Equidistant, AxisBoundaryType::Open>

Type alias for equidistant axis used in Hough transform.

HoughCount_t

template<typename spacepoint_t>

using Acts::HoughVertexFinder< spacepoint_t >::HoughCount_t = std::uint16_t

Type alias for count values in Hough histogram bins.

HoughHist

template<typename spacepoint_t>

using Acts::HoughVertexFinder< spacepoint_t >::HoughHist = Grid<HoughCount_t, HoughAxis, HoughAxis>

Type alias for 2D histogram used in Hough transform.

Constructor & Destructor Documentation

HoughVertexFinder()

template<typename spacepoint_t>

Acts::HoughVertexFinder< spacepoint_t >::HoughVertexFinder ( Config cfg, std::unique_ptr< const Logger > lgr = getDefaultLogger("HoughVertexFinder< spacepoint_t >", Logging::INFO) )

explicit

Constructor.

Parameters

cfg	Configuration object
lgr	Logging instance

Member Function Documentation

config()

template<typename spacepoint_t>

const Config & Acts::HoughVertexFinder< spacepoint_t >::config

(

)

const

Const access to the config.

Returns

Const reference to the configuration object

find()

template<typename spacepoint_t>

Acts::Result< Acts::Vector3 > Acts::HoughVertexFinder< spacepoint_t >::find

(

const std::vector< spacepoint_t > &

spacepoints

)

const

Finds the vertex based on the provided spacepoints.

Parameters

spacepoints

Vector of the input spacepoints; they do not need to be sorted anyhow

Returns

Position of the vertex