STAR QA Board

[Benjamin Kimelman <bkimelman@ucdavis.edu>]

Hi QA board,

Yesterday evening we had one run of 26.5GeV FXT data during CeC running. You can look at my QA for that one run here: https://www.star.bnl.gov/protected/lfsupc/bkimel/run20QA/AuAu_26p5GeV_FXT/day211/AuAu_26p5GeV_FXT_run_21211028_QA.pdf

There are a few things I want to point out:

1. The vertexing algorithm was not adjusted for FXT (I'm guessing that Gene didn't know that we were going to take FXT data and didn't change the algorithm, but I only found out at the end of the run)
2. On slides 7&8, the right column shows only tracks that have dE/dx<1. In 2019, we had seen an issue with a large number of tracks having dE/dx<1, which is why these QA plots exist. This seems to be a similar issue, although it appears that the particle bands in dE/dx are very wide. I cannot remember the cause of this, but I will look back through emails to identify that before we meet tomorrow.
3. On slide 5, we can see shadow bands in the eToF 1/beta and mass distribution, which shows that it is not properly calibrated.

Ben Kimelman

Ph.D. Candidate, Nuclear Physics Group

UC Davis

He/him/his