STAR Flow, Chirality and Vorticity PWG

[ASHIK IKBAL <ashikhep AT gmail.com>]

Dear Shinlchi,

Thanks for pointing this out. We can add <phi> and the vertex related quantity,<dca> in the QA list. We will have separate bad run list for centrality determination and also for the physics analyses as clarified by Rongrong in his email. 

The reason for adding the Q-vectors in the list is the following. We see there is a run ID dependence of the Q-vectors. The Q-vectors are really necessary for flow analyses, and hence has been added in the QA variable list.

Therefore, the idea of this discussion is to get suggestions about the QA variables that are sensitive to centrality determination as well as physics analyses from the PWG.

Best,

Ashik 

On Sun, Oct 17, 2021 at 1:33 PM ShinIchi Esumi via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:

Dear Ashik and all
Thanks for the initiation. I have a few comments and questions.  
I was wondering why you have chosen to use Q-vectors in stead of more direct
average <phi> at least for TPC, since you do have also average <eta> and <pT>.
But maybe Q-vector would  be directly used by the analysis, and could be more
sensitive to the location of dead azimuthal sector than <phi>, so it might be more
reasonable as well, though. Another question is about the vertex qualities, such
as run-by-run average vertex position in radial/xy and z direction? The “average
DCAxy/z in each event” was also found to be a good indicator for removing bad
events in BES1 especially for central events in fluctuation analysis, so I was also
wondering if run-by-run selection based on such DCA related information as well,
but this might be too much for the current initial QA studies especially for the
general centrality. Thanks again.
Best regards, ShinIchi

> On Oct 18, 2021, at 1:49, Prithwish Tribedy via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:
>
> Hi Ashik and all,
>  During our isobar analysis we compiled a list of observables. This may give us some clue about which quantities are important:
> https://drupal.star.bnl.gov/STAR/system/files/summary_qa_step2.html
>
> I would still encourage people to provide input before Friday.
> Best,
> Prithwish
>
>
> On 2021-10-17 12:36, ASHIK IKBAL via Star-fcv-l wrote:
>> Hi FCV folks,
>> We had a discussion on the QA variables for new and upcoming data sets
>> in the last week QA board meeting. So far we (the QA team) are using
>> the following variables for 19.6 GeV run-by-run QA analysis:
>> 1       runidvsrefmult
>> 2       runidvstofmatched
>> 3       runidvsavgpt
>> 4       runidvsavgeta
>> 5       runidvsavgQ1x
>> 6       runidvsavgQ1y
>> 7       runidvsavgQ2x
>> 8       runidvsavgQ2y
>> 9       runidvsavgEpdQ1x
>> 10      runidvsavgEpdQ1y
>> 11      runidvsavgEpdQ2x
>> 12      runidvsavgEpdQ2y
>> 13.             runidvsbemcmatched
>> The list of  badruns (identified based on the QA variables using
>> automated run-by-run QA algorithm) is really necessary for the
>> centrality team. The QA board has set a deadline of next Friday (Oct.
>> 22) to finalize the variables.
>> Please speak up if anyone wants to look at any other variables for the
>> run-by-run QA analysis.
>> Thanks,
>> Ashik
>> --
>> Ashik Ikbal
>> Research Associate
>> Kent State University
>> Department Of Physics
>> Kent, OH 44242, USA
>> Contact no.s: +1 631-504-7647 (USA)
>>                      +91 8250216234 (India)
>> Alternate e-mails: asheikh2 AT kent.edu
>>                             ashik AT rcf.rhic.bnl.gov
>>                             ashik.ikbal.sheikh AT cern.ch
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--

Ashik Ikbal

Research Associate

Kent State University

Department Of Physics

Kent, OH 44242, USA

Contact no.s: +1 631-504-7647 (USA)

                      +91 8250216234 (India)

Alternate e-mails: asheikh2 AT kent.edu

                             ashik AT rcf.rhic.bnl.gov

                             ashik.ikbal.sheikh AT cern.ch