The Trimmed Kalman vertex reconstructor

Complete: 2


The Trimmed Kalman vertex reconstructor iteratively uses the Trimmed Kalman vertex fitter to find and fit interaction vertices. After each fitted vertex, the remaining tracks are re-used to search for further vertices.

The fitter is implemented in the package RecoVertex/TrimmedKalmanVertexFinder


A default An easy way to use the TKVF is through the KalmanTrimmedVertexFinder. It uses a conventional Kalman filter to fit the vertices, without the user having to specify anything. It is then used like any other VertexReconstructor.
KalmanTrimmedVertexFinder finder;
vector<TransientVertex> vertices = finder.vertices ( vector<TransientTrack> tracks );


The following parameters can be defined by the following set methods:

  • ptCut: defines the minimum pT of the tracks used to make vertices.
    default: 1.5 GeV/c
    method: setPtCut(float cut)
  • trackCompatibilityCut: defines the probability below which a track is considered incompatible with the 1st vertex candidate formed.
    default: 0.05
    method: setTrackCompatibilityCut(float cut)
  • trackCompatibilityToSV : defines the probability below which a track is considered incompatible with the next vertex candidates formed.
    default: 0.01
    method: setTrackCompatibilityToSV(float cut)
  • vertexFitProbabilityCut: defines the probability below which a vertex is rejected
    default: 0.01
    method: setVertexFitProbabilityCut(float cut)
  • maxNbOfVertices : defines the maximum number of vertices searched for. 0 means no limitations.
    default: 0
    method: setMaxNbOfVertices(int max)

-- Main.speer - 05 Jul 2007

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Topic revision: r1 - 2007-07-05 - ThomasSpeer
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