STAR QA Board

[Benjamin Kimelman <bkimelman@ucdavis.edu>]

Hi Gene and the QA Board,

I've been looking more through my QA and I have identified the run where the Vz distribution drops on day 72: 20072034.

You can look at my QA plots for that run here: https://www.star.bnl.gov/protected/lfsupc/bkimel/productionQA/AuAu_19p6GeV_2019_calib/runs/AuAu_19p6GeV_run_20072034_productionQA.pdf

The vertex does seem to be shifted more in the negative direction. It was also the first physics run of a new fill after about 12 hours of pedestals and cosmics. This makes me more inclined to believe that the shift we see in my QA in the mean Vz is due to beam conditions.

Ben Kimelman

Ph.D. Candidate, Nuclear Physics Group

UC Davis

He/him/his