I did some QA for run VIII dAu production trying to evaluate how good is the Minuit vertex finder in dAu.

Compare to Marco's QA for previous years:

http://www.star.bnl.gov/protected/highpt/mvl/multi_vertex/

First,there are events with a large number of vertices (collision rate is more than Cu+Cu and Au+Au of previous years ."Run 7 collision rates up to ~20 kHz".........."Run 8 d+Au collision rates up to ~300 kHz" ),so the challenge would be to tell how good the best vertex is (purity vs. efficiency):

And <dip> rank shows some dependence on multiplicity:

With a different scale (note the "alien face" on the top left side: