STAR Flow, Chirality and Vorticity PWG

[subhash <subhash AT rcf.rhic.bnl.gov>]

Dear Cameron,

Ok, I want to understand whether or not the Barlow test you are 
performing can underestimate (overestimate) the errors in your central 
(peripheral) bins.
What I mean here is for example if you have apply tighter vz selection 
for your systematic variation, the data sample of tighter vz sample is a 
sub-sample of your default vz case. As per my understanding, you should 
perform Barlow test for such kind of cases where statistical samples are 
different. I think nhits cuts etc could fall in that category. But I 
think the variation of eta-sub events (which is a reference plane) 
should not be included in Barlow rejection test. What do you think?

Thanks and regards,
Subhash

On 2022-04-01 10:27 AM, Cameron Racz wrote:
> Hi Subhash,
>
> Yes for every cut in that presentation you linked I ran the full
> analysis with a higher setting and a lower setting, separately. I also
> only ran with one variation at a time. I then performed the Barlow
> check for every cut. For the vz cut, for example, I look at the
> average Delta/sigma_Delta (from that presentation) that includes the
> results from the higher and lower vz cut. So for each cut, that
> average includes both the high and low settings, and is averaged over
> all bins of v3 plots (most of which are not being shown in the
> presentation).
>
> I’m not totally sure if this answers your last statement about
> needing a sub-sample, but hopefully it clarifies things. I’m
> interested to know what you mean by “sub-sample of the default cut
> settings” if you could explain that a little more.
>
> Thanks,
>
> Cameron Racz
> Ph.D. Candidate
> Heavy-ion Physics Group
> University of California, Riverside
>
> > On Mar 31, 2022, at 10:02 PM, subhash <subhash AT rcf.rhic.bnl.gov>
> > wrote:
> > Dear Cameron,
> >
> > Thanks for considering our suggestion.
> > Actually the sudden jump of systematics for peripheral bins catches
> > the eye. I have a follow up question on the estimation of the
> > systematic uncertainty. I see you did a Barlow check and assigned
> > systematics if it passed the check.
> (https://drupal.star.bnl.gov/STAR/system/files/CRacz_3GeV_prelimUpdate.pdf).
> > Do you perform this check for all the analysis cuts variation? It is
> > not clear from your slides. This check should only be performed, if
> > the statistical sample of systematic variation is a sub-sample of
> > the default cut settings (e.g. loose and stricter vz cut). Can you
> > please clarify on this.
> >
> > Thanks and regards,
> > Subhash
> >
> > On 2022-04-01 07:50 AM, Cameron Racz wrote:
> > Hello all,
> > Thank you for the comments on my poster. I’ve incorporated the
> > changes suggested from the google doc and meeting and the new poster
> > slides (version 2) can be found here
> https://drupal.star.bnl.gov/STAR/presentations/Quark-Matter-2022/Event-Plane-Correlated-Triangular-Flow-sqrtsNN-30-GeV-AuAu-Collision
> > For the questions on the systematics for v3 vs rapidity with
> > symmetry
> > across mid-rapidity (center of slide 4), the 0-10% centrality and
> > 10-40% centrality points do have systematic errors but they are too
> > small to show up on the plot. We considered the suggestions to
> > estimate larger systematic uncertainties for 10-40% with linear fits
> > but we did not see a statistically legitimate way to do that. The
> > current plan will be to pursue a more detailed study of systematics
> > after Quark Matter.
> > I did however include these fits in estimating the uncertainty in my
> > measurement of the slope dv3/dy. I used fits on either side of
> > mid-rapidity to estimate the slopes, and found those two values had
> > a
> > percent difference of about 20%. Since my measurement was dv3/dy
> > =-0.025, my 20% estimate of the uncertainty is +-0.005 and this has
> > been put in the summary slide 5.
> > Cameron Racz
> > Ph.D. Candidate
> > Heavy-ion Physics Group
> > University of California, Riverside
> > On Mar 30, 2022, at 9:08 PM, subhash via Star-fcv-l
> > <star-fcv-l AT lists.bnl.gov> wrote:
> > Dear All,
> > Thanks everyone for joining the discussion.
> > This a important reminder, please consider all the suggestions you
> > received during the meeting, update your slides/posters/figures in
> > the Drupal, go through the google doc and consider comments
> > whichever is applicable, send the homework slides/comparisons to
> > this email thread as early as possible. Here is the link to the
> > recordings of our meeting and also posted in the meeting page.
> > Recording:
> https://stonybrook.zoom.us/rec/share/z5eTtFZ4yD0JriCV-UiEYviMAEJnop-IK2H_VZVHAvS71p0INvxNrxG78fS3Y97k.n0XnfapgIXnBPxh7
> > [1]
> > [1]
> > google doc:
> https://docs.google.com/document/d/1XgLXQW1zIqp5qTr8n9xoesOOlmHmu1a9zUvkXVPQ7II/edit?usp=sharing
> > [2]
> > [2]
> > Thanks and regards,
> > Jiangyong, Prithwish and Subhash
> > On 2022-03-30 06:06 PM, subhash wrote:
> > Dear All,
> > This is a gentle reminder about today's FCV meeting for QM poster
> > approval at 11.30 am EST. The agenda is here:
> > https://drupal.star.bnl.gov/STAR/blog/jjiastar/bulkcorr
> > You can post your comments/suggestions/edits to each poster here:
> https://docs.google.com/document/d/1XgLXQW1zIqp5qTr8n9xoesOOlmHmu1a9zUvkXVPQ7II/edit?usp=sharing
> > [2]
> > [2]
> > Thanks and regards,
> > Jiangyong, Prithwish and Subhash
> > On 2022-03-29 10:37 AM, subhash wrote:
> > Dear All,
> > We will have a special FCV meeting on March 30 Wednesday starting
> > 11.30 am EST (NY time) to go through the QM posters from FCV group.
> > We
> > will have 5 minute for each poster + discussions, if needed. We
> > suggest you to make 5 slides for your presentation that we can go
> > through. We will collect cosmetic comments in a google doc, will be
> > shared during the meeting. We request you, especially senior FCV
> > members, to join this meeting. Here is the tentative agenda.
> > Kosuke,
> > Takafumi,
> > Xingrui,
> > Diyu,
> > Li-ke,
> > Zuowen,
> > Edwin,
> > Priyanshi,
> > Rishabh,
> > Prabhupada,
> > Jagbir,
> > Xiaoyu,
> > Ding,
> > Cameron,
> > Chunjian,
> > Yicheng,
> > Jiangyong
> > We will use our regular zoom room.
> https://stonybrook.zoom.us/j/95735410810?pwd=M2JRZDBDSng4MG5SYmx6dlppYXhLZz09
> > [3]
> > [3]
> > Meeting ID: 957 3541 0810
> > Passcode: 486227
> > Thanks and regards,
> > Jiangyong, Prithwish and Subhash
> > _______________________________________________
> > Star-fcv-l mailing list
> > Star-fcv-l AT lists.bnl.gov
> > https://lists.bnl.gov/mailman/listinfo/star-fcv-l
> > Links:
> > ------
> > [1]
> https://urldefense.com/v3/__https://stonybrook.zoom.us/rec/share/z5eTtFZ4yD0JriCV-UiEYviMAEJnop-IK2H_VZVHAvS71p0INvxNrxG78fS3Y97k.n0XnfapgIXnBPxh7__;!!P4SdNyxKAPE!S4vfJBvfSdbJvy1bKseaLwsiSZXoTJuFBS_RsYhcQUgftQAxGwIzH0NxonjkK3FRd-kP7qg$
> > [2]
> https://urldefense.com/v3/__https://docs.google.com/document/d/1XgLXQW1zIqp5qTr8n9xoesOOlmHmu1a9zUvkXVPQ7II/edit?usp=sharing__;!!P4SdNyxKAPE!S4vfJBvfSdbJvy1bKseaLwsiSZXoTJuFBS_RsYhcQUgftQAxGwIzH0NxonjkK3FR-RNAUeE$
> > [3]
> https://urldefense.com/v3/__https://stonybrook.zoom.us/j/95735410810?pwd=M2JRZDBDSng4MG5SYmx6dlppYXhLZz09__;!!P4SdNyxKAPE!S4vfJBvfSdbJvy1bKseaLwsiSZXoTJuFBS_RsYhcQUgftQAxGwIzH0NxonjkK3FRaHqZ834$
>
>
>
> Links:
> ------
> [1] 
> https://urldefense.com/v3/__https://stonybrook.zoom.us/rec/share/z5eTtFZ4yD0JriCV-UiEYviMAEJnop-IK2H_VZVHAvS71p0INvxNrxG78fS3Y97k.n0XnfapgIXnBPxh7__;!!P4SdNyxKAPE!T606Y0QsYS0ijrg68ld9yElCstOSWe4CJ3bE9BtmzYDpbKegd5ayu2H6IZ7W9rgW2mdlRBI$
> [2] 
> https://urldefense.com/v3/__https://docs.google.com/document/d/1XgLXQW1zIqp5qTr8n9xoesOOlmHmu1a9zUvkXVPQ7II/edit?usp=sharing__;!!P4SdNyxKAPE!T606Y0QsYS0ijrg68ld9yElCstOSWe4CJ3bE9BtmzYDpbKegd5ayu2H6IZ7W9rgWNsyr-pI$
> [3] 
> https://urldefense.com/v3/__https://stonybrook.zoom.us/j/95735410810?pwd=M2JRZDBDSng4MG5SYmx6dlppYXhLZz09__;!!P4SdNyxKAPE!T606Y0QsYS0ijrg68ld9yElCstOSWe4CJ3bE9BtmzYDpbKegd5ayu2H6IZ7W9rgWQxlZR7g$