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The TertiaryTracksVertexFinder (TTVF) is designed for reconstructing secondary vertices in jets. It is documented in CMS Note 2006/027 where its implementation in the previous software framework ORCA is called TertiaryVertexTrackFinder (TVTF).
The basic idea is to find tracks from a tertiary charm hadron decay in the b-c decay cascade, and associate them to the secondary vertex. The procedure is as follows: First, the standard TrimmedKalmanVertexFinder is run in order to reconstruct secondary vertex candidates. Then, a filter is run on the vertices in which primary vertices, conversions, nuclear interactions or K0 candidates are rejected. The b-flightline is reconstructed from the primary and secondary vertex. Tracks close to the b-flight line not associated to a vertex are searched and added to the secondary vertex. Note that the position of the secondary vertex is not recalculated after the additional tracks have been added.
More information can be found here.
Unknown
Initial version. To be used with Combined secondary vertex b-tagger.
1.7.3