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## The Trimmed Kalman vertex reconstructor | |||||||||||||||||||||||||

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## Parameters | |||||||||||||||||||||||||

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

> > | To change the parameters, the easiest is to use the method. Alternatively, individual set methods can be used. The PSet needed is the following: | ||||||||||||||||||||||||

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< < | - 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)**
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> > | GSFParameters = cms.PSet( ptCut = cms.double(0.0), vtxFitProbCut = cms.double(0.01), trackCompatibilityToPVcut = cms.double(0.05), trackCompatibilityToSVcut = cms.double(0.01), maxNbOfVertices = cms.int32(0) ) The parameters are the following:
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-- Main.speer - 05 Jul 2007 \ No newline at end of file |

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> > |
## The Trimmed Kalman vertex reconstructorComplete: Contents:
## OverviewThe 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
## UsageA 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 );
## ParametersThe 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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