STAR Flow, Chirality and Vorticity PWG

[Cameron Racz <cracz001 AT ucr.edu>]

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]
google doc:

https://docs.google.com/document/d/1XgLXQW1zIqp5qTr8n9xoesOOlmHmu1a9zUvkXVPQ7II/edit?usp=sharing

[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]
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]
Meeting ID: 957 3541 0810
Passcode: 486227
Thanks and regards,
Jiangyong, Prithwish and Subhash

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