STAR QA Board

[Benjamin Kimelman <bkimelman@ucdavis.edu>]

Hi Rosi,

Great idea. I went ahead and made that plot and I'm attaching it here. The VPD Vz appears to be very consistent with the TPC Vz and shows the distribution shifter toward more negative values.

Ben Kimelman

Ph.D. Candidate, Nuclear Physics Group

UC Davis

He/him/his

On Tue, Jul 14, 2020 at 11:18 AM Rosi Reed <rosijreed@lehigh.edu> wrote:

Hi Ben,

Even though the statistics will be low, if this is due to the beam
conditions you should see the same shift in the vpd Vz, which could be
a good cross-check.

Cheers,

Rosi

On Tue, Jul 14, 2020 at 2:15 PM Benjamin Kimelman via STAR-QAboard-l
<star-qaboard-l@lists.bnl.gov> wrote:
>
> 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
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--
Rosi Reed
RHIC/AGS UEC member
Associate Professor, Physics Department
Lehigh University
(610)758-3907
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she/her/hers

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