Method to refit vertex with partial set of its tracks

[shahor02]

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[shahor02]

@mfaggin : example of refitting the vertex with some tracks suppressed is in the attached vtxRefit.C.
This is just a simple exercise with the vertex made of ITS tracks only, so I could use the tracks from the ITS reco file.
I assume that in general, you will be refitting the vertices from the AOD. In this case you will need to prepare a vector of TrackParCov tracks (or any class derived from it) selecting the tracks contributing to vertex (needs #7654 + implementing filling this info) and pass it to the vertexer as in this example.
Note that only position is refitted, the time info in ignored.

tstVtxRefit.tar.gz