Offline Vertex finding

Complete: 1

The task of Vertex Finding is, given a set of tracks, to identify possible vertices and assign the tracks to the eventual vertices. In addition, a fit of the found vertices is often performed.

The task of the VertexReconstructor is to control all the steps of the reconstruction from the input of the initial tracks to the output of the list of vertices. Depending on the implementation of the concrete VertexReconstructor the different objects which perform the different steps are either hard-coded or have to be given at construction time. Most reconstructors will use internally a VertexFitter.

Offline vertex finding can not be done globally (with the exception of the search for the primary vertices), and so have to be called by the user in his own analyser or producer, with a collection of tracks that he has selected. So its basic usage is very simple, through the method vertices. As with most high-level algorithms, TransientTracks have to be used:

vector< TransientVertex > vertices (const vector<TransientTrack > &)

Several finders are now available:

-- Main.speer - 03 Apr 2007

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Topic revision: r1 - 2007-04-03 - ThomasSpeer

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