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	Config
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 >	fit (State &state, const VertexingOptions &vertexingOptions) const
	Performs a simultaneous fit of all vertices in state.vertexCollection.

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()

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.

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

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

Returns

Result<void> object

fit()

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

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

Parameters

state	Fitter state
vertexingOptions	Vertexing options

Returns

Result<void> object