STAR QA Board

[Benjamin Kimelman <bkimelman@ucdavis.edu>]

Hi All,

I just ran my QA again over the newly processed FastOffline for 26.5GeV FXT. The issue with the vertex has been solved, but there are still a significant portion of the tracks that have dEdx<1, most of which have dE/dx=0. You can find my plots here: https://www.star.bnl.gov/protected/lfsupc/bkimel/run20QA/AuAu_26p5GeV_FXT/day211/AuAu_26p5GeV_FXT_run_21211028_QA.pdf

Ben Kimelman

Ph.D. Candidate, Nuclear Physics Group

UC Davis

He/him/his

On Fri, Jul 31, 2020 at 8:47 AM Van Buren, Gene <gene@bnl.gov> wrote:

There are still a few jobs running, but many have finished if anyone wants to take a quick look before the noon QA meeting.

-Gene


> On Jul 30, 2020, at 11:58 PM, Van Buren, Gene via STAR-QAboard-l <star-qaboard-l@lists.bnl.gov> wrote:
>
> I indeed missed it and just learned about it now by reading this thread. Database updated, and we'll reprocess the run.
>
> Thanks,
> -Gene
>
>
>> On Jul 30, 2020, at 11:28 PM, Benjamin Kimelman via STAR-QAboard-l <star-qaboard-l@lists.bnl.gov> wrote:
>>
>> Hi Rosi,
>>
>> I agree. I think many of us were caught unaware of the fact that we were going to collect FXT data. Now that we know it is a possibility during CeC running, I hope we can set the vertexing correct for the future.
>>
>> Ben Kimelman
>> Ph.D. Candidate, Nuclear Physics Group
>> UC Davis
>> He/him/his
>>
>>
>> On Thu, Jul 30, 2020 at 8:20 PM Rosi Reed <rosijreed@lehigh.edu> wrote:
>> Hi Ben,
>>
>> We could ask Gene to change the settings - and then perhaps have
>> another small production done in order to give you something to
>> analyze from the whole data set.  I suppose we will be doing this
>> again so probably can have the FXT settings loaded for the CeC running
>> in the future.
>>
>> Cheers,
>>
>> Rosi
>>
>> On Thu, Jul 30, 2020 at 7:52 PM Benjamin Kimelman via STAR-QAboard-l
>> <star-qaboard-l@lists.bnl.gov> wrote:
>>>
>>> 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:
>>>
>>> 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)
>>> 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.
>>> 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
>>> _______________________________________________
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>>> STAR-QAboard-l@lists.bnl.gov
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>>
>>
>>
>> --
>> Rosi Reed
>> RHIC/AGS UEC member
>> Associate Professor, Physics Department
>> Lehigh University
>> (610)758-3907
>> 16 Memorial Drive East Office 406
>> Bethlehem, PA 18015
>> she/her/hers
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