Acts::AdaptiveMultiVertexFitter Class Reference

Implements an adaptive multi-vertex fitter as described in detail in Section 5.3.5 in: Ref. More...

#include <Acts/Vertexing/AdaptiveMultiVertexFitter.hpp>

Classes
struct	Cache
	The fitter-private cache. More...
struct	Config
	Configuration options for the adaptive multi-vertex fit. More...
struct	State
	The fitter state. More...

Public Member Functions
	AdaptiveMultiVertexFitter (Config cfg, std::unique_ptr< const Logger > logger=getDefaultLogger("AdaptiveMultiVertexFitter", Logging::INFO))
	Constructor for user-defined InputTrack_t type != BoundTrackParameters.
Result< void >	addVtxToFit (State &state, const std::vector< Vertex * > &newVertices, const VertexingOptions &vertexingOptions) const
	Adds a new vertex to an existing multi-vertex fit.
Result< void >	addVtxToFit (VertexFitProblem &problem, const std::vector< Vertex * > &newVertices, const VertexingOptions &vertexingOptions, Cache &cache) const
	Adds a new vertex to an existing multi-vertex fit.
Result< void >	fit (State &state, const VertexingOptions &vertexingOptions) const
	Performs a simultaneous fit of all vertices in state.vertexCollection.
Result< void >	fit (VertexFitProblem &problem, const VertexingOptions &vertexingOptions, Cache &cache) const
	Performs a simultaneous fit of all vertices in problem.vertices.

Detailed Description

Implements an adaptive multi-vertex fitter as described in detail in Section 5.3.5 in: Ref.

(1): CERN-THESIS-2010-027, Author: Piacquadio, Giacinto: Identification of b-jets and investigation of the discovery potential of a Higgs boson in the WH−−>lvbb¯ channel with the ATLAS experiment

Constructor & Destructor Documentation

AdaptiveMultiVertexFitter()

Acts::AdaptiveMultiVertexFitter::AdaptiveMultiVertexFitter ( Config cfg, std::unique_ptr< const Logger > logger = getDefaultLogger("AdaptiveMultiVertexFitter", Logging::INFO) )

explicit

Constructor for user-defined InputTrack_t type != BoundTrackParameters.

Parameters

cfg	Configuration object object
logger	The logging instance

Member Function Documentation

addVtxToFit() [1/2]

Result< void > Acts::AdaptiveMultiVertexFitter::addVtxToFit	(	State &	state,
		const std::vector< Vertex * > &	newVertices,
		const VertexingOptions &	vertexingOptions ) const

Adds a new vertex to an existing multi-vertex fit.

Deprecated

Use the overload taking a VertexFitProblem and a Cache

Parameters

state	Fitter state
newVertices	Vertex to be added to fit
vertexingOptions	Vertexing options

Returns

Result<void> object

addVtxToFit() [2/2]

Result< void > Acts::AdaptiveMultiVertexFitter::addVtxToFit	(	VertexFitProblem &	problem,
		const std::vector< Vertex * > &	newVertices,
		const VertexingOptions &	vertexingOptions,
		Cache &	cache ) const

Adds a new vertex to an existing multi-vertex fit.

1. The 3D impact parameters are calculated for all tracks associated with newVertex.
2. A list of all vertices that are connected with newVertex via shared tracks is created. It also considers indirect connections (e.g., vertex A which shares a track with vertex B which, in turn, shares a track with newVertex).
3. The multivertex fit is performed for all vertices on said list.

Parameters

problem	The multi-vertex fit problem
newVertices	Vertex to be added to fit
vertexingOptions	Vertexing options
cache	Fitter cache

Returns

Result<void> object

fit() [1/2]

Result< void > Acts::AdaptiveMultiVertexFitter::fit	(	State &	state,
		const VertexingOptions &	vertexingOptions ) const

Performs a simultaneous fit of all vertices in state.vertexCollection.

Deprecated

Use the overload taking a VertexFitProblem and a Cache

Parameters

state	Fitter state
vertexingOptions	Vertexing options

Returns

Result<void> object

fit() [2/2]

Result< void > Acts::AdaptiveMultiVertexFitter::fit	(	VertexFitProblem &	problem,
		const VertexingOptions &	vertexingOptions,
		Cache &	cache ) const

Performs a simultaneous fit of all vertices in problem.vertices.

Parameters

problem	The multi-vertex fit problem
vertexingOptions	Vertexing options
cache	Fitter cache

Returns

Result<void> object