Acts::IterativeVertexFinder< vfitter_t, sfinder_t > Class Template Reference

Implements an iterative vertex finder. More...

#include <acts/blob/sPHENIX/Core/include/Acts/Vertexing/IterativeVertexFinder.hpp>

Collaboration diagram for Acts::IterativeVertexFinder< vfitter_t, sfinder_t >:

Classes
struct	Config
struct	State

Public Types
using	InputTrack_t = typename vfitter_t::InputTrack_t
using	IPEstimator = ImpactPointEstimator< InputTrack_t, Propagator_t >

Public Member Functions
template<typename T = InputTrack_t, std::enable_if_t< std::is_same< T, BoundTrackParameters >::value, int > = 0>
	IterativeVertexFinder (Config &cfg, std::unique_ptr< const Logger > logger=getDefaultLogger("IterativeVertexFinder", Logging::INFO))
	Constructor used if InputTrack_t type == BoundTrackParameters.
	m_logger (std::move(logger))
	IterativeVertexFinder (Config &cfg, std::function< BoundTrackParameters(InputTrack_t)> func, std::unique_ptr< const Logger > logger=getDefaultLogger("IterativeVertexFinder", Logging::INFO))
	Constructor for user-defined InputTrack_t type =! BoundTrackParameters.
Result< std::vector< Vertex < InputTrack_t > > >	find (const std::vector< const InputTrack_t * > &trackVector, const VertexingOptions< InputTrack_t > &vertexingOptions, State &state) const
	Finds vertices corresponding to input trackVector.

Private Types
using	Propagator_t = typename vfitter_t::Propagator_t
using	Linearizer_t = typename vfitter_t::Linearizer_t

Private Member Functions
const Logger &	logger () const
	Private access to logging instance.
Result< Vertex< InputTrack_t > >	getVertexSeed (const std::vector< const InputTrack_t * > &seedTracks, const VertexingOptions< InputTrack_t > &vertexingOptions) const
	Method that calls seed finder to retrieve a vertex seed.
void	removeAllTracks (const std::vector< const InputTrack_t * > &perigeesToFit, std::vector< const InputTrack_t * > &seedTracks) const
	Removes all tracks in perigeesToFit from seedTracks.
Result< double >	getCompatibility (const BoundTrackParameters &params, const Vertex< InputTrack_t > &vertex, const VertexingOptions< InputTrack_t > &vertexingOptions, State &state) const
	Function for calculating how compatible a given track is to a given vertex.
Result< void >	removeUsedCompatibleTracks (Vertex< InputTrack_t > &myVertex, std::vector< const InputTrack_t * > &perigeesToFit, std::vector< const InputTrack_t * > &seedTracks, const VertexingOptions< InputTrack_t > &vertexingOptions, State &state) const
	Function that removes used tracks compatible with current vertex (myVertex) from perigeesToFit and seedTracks as well as outliers from myVertex.tracksAtVertex.
Result< void >	fillPerigeesToFit (const std::vector< const InputTrack_t * > &perigeeList, const Vertex< InputTrack_t > &seedVertex, std::vector< const InputTrack_t * > &perigeesToFitOut, std::vector< const InputTrack_t * > &perigeesToFitSplitVertexOut, const VertexingOptions< InputTrack_t > &vertexingOptions, State &state) const
	Function that fills vector with tracks compatible with seed vertex.
Result< bool >	reassignTracksToNewVertex (std::vector< Vertex< InputTrack_t >> &vertexCollection, Vertex< InputTrack_t > &currentVertex, std::vector< const InputTrack_t * > &perigeesToFit, std::vector< const InputTrack_t * > &seedTracks, const std::vector< const InputTrack_t * > &origTracks, const VertexingOptions< InputTrack_t > &vertexingOptions, State &state) const
	Function that reassigns tracks from other vertices to the current vertex if they are more compatible.
int	countSignificantTracks (const Vertex< InputTrack_t > &vtx) const
	Counts all tracks that are significant for a vertex.

Private Attributes
const Config	m_cfg
	Configuration object.
std::function < BoundTrackParameters(InputTrack_t)>	m_extractParameters
	Function to extract track parameters, InputTrack_t objects are BoundTrackParameters by default, function to be overwritten to return BoundTrackParameters for other InputTrack_t objects.
std::unique_ptr< const Logger >	m_logger
	Logging instance.

Detailed Description

template<typename vfitter_t, typename sfinder_t>
class Acts::IterativeVertexFinder< vfitter_t, sfinder_t >

Implements an iterative vertex finder.

Brief description of the algorithm implemented: Iterative vertex finder which iteratively finds and fits vertices:

1. A list of seed tracks (seedTracks, which is the same as the input track list to the finder at the very first iteration) is used to retrieve a single vertex seed using the ZScanVertexFinder.
2. All tracks compatible with the current vertex seed are kept and used for fitting the single vertex. 3.1 If the vertex is a 'good' vertex (i.e. meets requirements) and no track reassignment after first fit is required, go to step 4. If vertex is not a good vertex, remove all tracks in perigeesToFit from seedTracks. 3.2 If vertex meets requirements and track reassignment after first fit is required, iterate over all previously found vertices ("old vertex") and over all their tracksAtVertex. Compare compatibility of each track with old vertex and current vertex. If track is more compatible with current vertex, remove track from old vertex, put track back to perigeesToFit and refit current vertex with additional track.
3. If good vertex, removeUsedCompatibleTracks method is called, which removes all used tracks that are compatible with the fitted vertex from perigeesToFit and seedTracks. It also removes outliers tracks from tracksAtVertex if not compatible.
4. Add vertex to vertexCollection
5. Repeat until no seedTracks are left or max. number of vertices found

Template Parameters

vfitter_t	Vertex fitter type
sfinder_t	Seed finder type

Definition at line 60 of file IterativeVertexFinder.hpp.

View newest version in sPHENIX GitHub at line 60 of file IterativeVertexFinder.hpp

Member Typedef Documentation

template<typename vfitter_t , typename sfinder_t >

using Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::InputTrack_t = typename vfitter_t::InputTrack_t

Definition at line 67 of file IterativeVertexFinder.hpp.

View newest version in sPHENIX GitHub at line 67 of file IterativeVertexFinder.hpp

template<typename vfitter_t , typename sfinder_t >

using Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::IPEstimator = ImpactPointEstimator<InputTrack_t, Propagator_t>

Definition at line 68 of file IterativeVertexFinder.hpp.

View newest version in sPHENIX GitHub at line 68 of file IterativeVertexFinder.hpp

template<typename vfitter_t , typename sfinder_t >

using Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::Linearizer_t = typename vfitter_t::Linearizer_t

private

Definition at line 64 of file IterativeVertexFinder.hpp.

View newest version in sPHENIX GitHub at line 64 of file IterativeVertexFinder.hpp

template<typename vfitter_t , typename sfinder_t >

using Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::Propagator_t = typename vfitter_t::Propagator_t

private

Definition at line 63 of file IterativeVertexFinder.hpp.

View newest version in sPHENIX GitHub at line 63 of file IterativeVertexFinder.hpp

Constructor & Destructor Documentation

template<typename vfitter_t , typename sfinder_t >

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

Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::IterativeVertexFinder ( Config &  cfg, std::unique_ptr< const Logger >  logger = getDefaultLogger(                            "IterativeVertexFinder< vfitter_t, sfinder_t >", Logging::INFO)  )

inline

Constructor used if InputTrack_t type == BoundTrackParameters.

Parameters

cfg	Configuration object
logger	The logging instance

Definition at line 129 of file IterativeVertexFinder.hpp.

View newest version in sPHENIX GitHub at line 129 of file IterativeVertexFinder.hpp

template<typename vfitter_t , typename sfinder_t >

Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::IterativeVertexFinder ( Config &  cfg, std::function< BoundTrackParameters(InputTrack_t)>  func, std::unique_ptr< const Logger >  logger = getDefaultLogger(                            "IterativeVertexFinder< vfitter_t, sfinder_t >", Logging::INFO)  )

inline

Constructor for user-defined InputTrack_t type =! BoundTrackParameters.

Parameters

cfg	Configuration object
func	Function extracting BoundTrackParameters from InputTrack_t object
logger	The logging instance

Definition at line 143 of file IterativeVertexFinder.hpp.

View newest version in sPHENIX GitHub at line 143 of file IterativeVertexFinder.hpp

Member Function Documentation

template<typename vfitter_t , typename sfinder_t >

int Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::countSignificantTracks ( const Vertex< InputTrack_t > &  vtx ) const

private

Counts all tracks that are significant for a vertex.

Parameters

vtx	The vertex
weightThreshold	Threshold to count all tracks with weights > weightThreshold

Returns

Number of significant tracks

Definition at line 528 of file IterativeVertexFinder.ipp.

View newest version in sPHENIX GitHub at line 528 of file IterativeVertexFinder.ipp

References Acts::Vertex< input_track_t >::tracks().

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template<typename vfitter_t , typename sfinder_t >

Acts::Result< void > Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::fillPerigeesToFit ( const std::vector< const InputTrack_t * > &  perigeeList, const Vertex< InputTrack_t > &  seedVertex, std::vector< const InputTrack_t * > &  perigeesToFitOut, std::vector< const InputTrack_t * > &  perigeesToFitSplitVertexOut, const VertexingOptions< InputTrack_t > &  vertexingOptions, State &  state  ) const

private

Function that fills vector with tracks compatible with seed vertex.

Parameters

perigeeList	List of all available tracks used for seeding
seedVertex	Seed vertex
perigeesToFitOut	Perigees to fit
perigeesToFitSplitVertexOut	Perigees to fit split vertex
vertexingOptions	Vertexing options
state	The state object

Definition at line 332 of file IterativeVertexFinder.ipp.

View newest version in sPHENIX GitHub at line 332 of file IterativeVertexFinder.ipp

References ACTS_WARNING, Acts::SingleBoundTrackParameters< charge_t >::covariance(), Acts::eBoundLoc0, Acts::eBoundLoc1, Acts::VertexingOptions< input_track_t >::geoContext, Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::State::ipState, and Acts::Vertex< input_track_t >::position().

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template<typename vfitter_t , typename sfinder_t >

auto Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::find	(	const std::vector< const InputTrack_t * > &	trackVector,
		const VertexingOptions< InputTrack_t > &	vertexingOptions,
		State &	state
	)		const

Finds vertices corresponding to input trackVector.

Parameters

trackVector	Input tracks
vertexingOptions	Vertexing options
state	State for fulfilling interfaces

Returns

Collection of vertices found by finder

Begin seeding

End seeding Now take only tracks compatible with current seed

Begin vertex fit

End vertex fit

Definition at line 10 of file IterativeVertexFinder.ipp.

View newest version in sPHENIX GitHub at line 10 of file IterativeVertexFinder.ipp

References ACTS_DEBUG, and Acts::Vertex< input_track_t >::fitQuality().

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template<typename vfitter_t , typename sfinder_t >

Acts::Result< double > Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::getCompatibility ( const BoundTrackParameters &  params, const Vertex< InputTrack_t > &  vertex, const VertexingOptions< InputTrack_t > &  vertexingOptions, State &  state  ) const

private

Function for calculating how compatible a given track is to a given vertex.

Parameters

params	Track parameters
vertex	The vertex
vertexingOptions	Vertexing options
state	The state object

Definition at line 203 of file IterativeVertexFinder.ipp.

View newest version in sPHENIX GitHub at line 203 of file IterativeVertexFinder.ipp

References Acts::Vertex< input_track_t >::fullCovariance(), Acts::Vertex< input_track_t >::fullPosition(), Acts::VertexingOptions< input_track_t >::geoContext, Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::State::linearizerState, and Acts::VertexingOptions< input_track_t >::magFieldContext.

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template<typename vfitter_t , typename sfinder_t >

auto Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::getVertexSeed ( const std::vector< const InputTrack_t * > &  seedTracks, const VertexingOptions< InputTrack_t > &  vertexingOptions  ) const

private

Method that calls seed finder to retrieve a vertex seed.

Parameters

seedTracks	Seeding tracks
vertexingOptions	Vertexing options

Definition at line 152 of file IterativeVertexFinder.ipp.

View newest version in sPHENIX GitHub at line 152 of file IterativeVertexFinder.ipp

References ACTS_DEBUG, Acts::eX, Acts::eY, Acts::eZ, Acts::Vertex< input_track_t >::fullPosition(), and Acts::Vertex< input_track_t >::time().

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template<typename vfitter_t , typename sfinder_t >

const Logger& Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::logger ( ) const

inlineprivate

Private access to logging instance.

Definition at line 178 of file IterativeVertexFinder.hpp.

View newest version in sPHENIX GitHub at line 178 of file IterativeVertexFinder.hpp

References Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::m_logger.

template<typename vfitter_t , typename sfinder_t >

Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::m_logger ( std::  movelogger )

inline

Definition at line 134 of file IterativeVertexFinder.hpp.

View newest version in sPHENIX GitHub at line 134 of file IterativeVertexFinder.hpp

template<typename vfitter_t , typename sfinder_t >

Acts::Result< bool > Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::reassignTracksToNewVertex ( std::vector< Vertex< InputTrack_t >> &  vertexCollection, Vertex< InputTrack_t > &  currentVertex, std::vector< const InputTrack_t * > &  perigeesToFit, std::vector< const InputTrack_t * > &  seedTracks, const std::vector< const InputTrack_t * > &  origTracks, const VertexingOptions< InputTrack_t > &  vertexingOptions, State &  state  ) const

private

Function that reassigns tracks from other vertices to the current vertex if they are more compatible.

Parameters

vertexCollection	Collection of vertices
currentVertex	Current vertex to assign tracks to
perigeesToFit	Perigees to fit vector
seedTracks	Seed tracks vector
origTracks	Vector of original track objects
vertexingOptions	Vertexing options
state	The state object

Returns

Bool if currentVertex is still a good vertex

Definition at line 403 of file IterativeVertexFinder.ipp.

View newest version in sPHENIX GitHub at line 403 of file IterativeVertexFinder.ipp

References ACTS_DEBUG, Acts::Vertex< input_track_t >::fitQuality(), and Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::State::fitterState.

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template<typename vfitter_t , typename sfinder_t >

void Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::removeAllTracks ( const std::vector< const InputTrack_t * > &  perigeesToFit, std::vector< const InputTrack_t * > &  seedTracks  ) const

private

Removes all tracks in perigeesToFit from seedTracks.

Parameters

perigeesToFit	Tracks to be removed from seedTracks
seedTracks	List to remove tracks from

Definition at line 180 of file IterativeVertexFinder.ipp.

View newest version in sPHENIX GitHub at line 180 of file IterativeVertexFinder.ipp

References ACTS_WARNING.

template<typename vfitter_t , typename sfinder_t >

Acts::Result< void > Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::removeUsedCompatibleTracks ( Vertex< InputTrack_t > &  myVertex, std::vector< const InputTrack_t * > &  perigeesToFit, std::vector< const InputTrack_t * > &  seedTracks, const VertexingOptions< InputTrack_t > &  vertexingOptions, State &  state  ) const

private

Function that removes used tracks compatible with current vertex (myVertex) from perigeesToFit and seedTracks as well as outliers from myVertex.tracksAtVertex.

Parameters

myVertex	Current vertex
perigeesToFit	Tracks used to fit myVertex
seedTracks	Tracks used for vertex seeding
vertexingOptions	Vertexing options
state	The state object

Definition at line 239 of file IterativeVertexFinder.ipp.

View newest version in sPHENIX GitHub at line 239 of file IterativeVertexFinder.ipp

References ACTS_DEBUG, ACTS_WARNING, Acts::Vertex< input_track_t >::setTracksAtVertex(), and Acts::Vertex< input_track_t >::tracks().

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Member Data Documentation

template<typename vfitter_t , typename sfinder_t >

const Config Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::m_cfg

private

Configuration object.

Definition at line 165 of file IterativeVertexFinder.hpp.

View newest version in sPHENIX GitHub at line 165 of file IterativeVertexFinder.hpp

template<typename vfitter_t , typename sfinder_t >

std::function<BoundTrackParameters(InputTrack_t)> Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::m_extractParameters

private

Function to extract track parameters, InputTrack_t objects are BoundTrackParameters by default, function to be overwritten to return BoundTrackParameters for other InputTrack_t objects.

Parameters

InputTrack_t

object to extract track parameters from

Definition at line 172 of file IterativeVertexFinder.hpp.

View newest version in sPHENIX GitHub at line 172 of file IterativeVertexFinder.hpp

template<typename vfitter_t , typename sfinder_t >

std::unique_ptr<const Logger> Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::m_logger

private

Logging instance.

Definition at line 175 of file IterativeVertexFinder.hpp.

View newest version in sPHENIX GitHub at line 175 of file IterativeVertexFinder.hpp

Referenced by Acts::IterativeVertexFinder< vfitter_t, sfinder_t >::logger().

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The documentation for this class was generated from the following files:

• acts/blob/sPHENIX/Core/include/Acts/Vertexing/IterativeVertexFinder.hpp
• acts/blob/sPHENIX/Core/include/Acts/Vertexing/IterativeVertexFinder.ipp