Skim Strategy with minimal time bias
- Look for two tracks with a good intersection and 1.7 < MKK< 2.1.
- Nucleate about seed track to form a primary vertex.
- Require > 2.5 ? separation (~20% of D0 lifetime) and kaonicity > 0.5.
- This is a candidate driven rather than topological vertex finder
Gives a nearly uniform time acceptance --right up to the skim cut