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star-fcv-l - Re: [Star-fcv-l] FCV PWG meeting on 20/Sept/2023 Wed. 9:30 AM EDT

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Subject: STAR Flow, Chirality and Vorticity PWG

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Re: [Star-fcv-l] FCV PWG meeting on 20/Sept/2023 Wed. 9:30 AM EDT

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  • From: tc88qy <tc88qy AT rcf.rhic.bnl.gov>
  • To: subhash <subhash AT rcf.rhic.bnl.gov>
  • Cc: "STAR Flow, Chirality and Vorticity PWG" <star-fcv-l AT lists.bnl.gov>
  • Subject: Re: [Star-fcv-l] FCV PWG meeting on 20/Sept/2023 Wed. 9:30 AM EDT
  • Date: Thu, 21 Sep 2023 22:31:20 +0800
Hello Subhash,

Yes, the event plane resolution correction has been propagated to both the central value of rho_00 and its errors.
The rho_00 shown in the slides are already corrected for event-plane resolution.
If it is rho_00^{obs} value in plots, I will write it as rho_00^{obs}.


Qian Yang

On 2023-09-21 20:11, subhash wrote:
Dear Qian,

Thanks for your response. I have one more comment that I think I
missed during yesterday's discussion. Do you propagate errors on
rho_00 when you apply event plane resolution correction. The
resolution correction will amplify the deviation from 1/3, but will
also enlarge your statistical error bar. Looking at the values of
rho_00^obs and rho_00^resol-corrected in figures, it seems to me that
error propagation is not considered. Am I correct, can you please
confirm?

Thanks and regards,
Subhash

On 2023-09-21 06:09 PM, tc88qy wrote:
Hi Subhash
Please find my reply inline.
Regards,
Qian Yang
On 2023-09-21 17:56, subhash wrote:
Dear Qian,

Thanks for this study. I have a few follow up comments:

1. My understanding is "directly from data(Red)" is over a wider
pt-range and "sum over (Magenta)" is statistical weighted average from
rho_00 vs pt, right? If the low and high pt range is same for red and
magenta points, eg 0.3 - 6 GeV/c, then I am fine with either
red/magenta points to be shown.
Right, the red data came from a wider pt-range, and sum over is
statistical weighted average from rho_00 vs pt.
It is the same pT range of 0.3-6 GeV/c for both case.

2. On your event plane, do you have any weighting factor in
reconstructing Q-vectors, e.g. a pt weight.
Yes, there is a pt weight

3. BTW, in your analysis do you have any opening angle selection? Why
I am asking is that we have seen such a cut can artificially enhance
the signal and one has to be careful in simulation when correcting for
such effect.
We did not apply any opening angle selection in the analysis.

Thanks and regards,
Subhash

On 2023-09-21 02:46 PM, tc88qy via Star-fcv-l wrote:
Hello All,
I did some study in terms of the comments I got from yesterdays fav
pwg meeting. Two things are request to be check.
One is the rho_00 consistence check of summing over rho_00 in
pT/centrality vs the rho_00 extracted directly from data.
The conclusion is that the centrality dependence is safe. By summing
over in centrality, it gives a consistent results. But summing over pT
do give some discrepancy which mainly due to 0.3-6 and 3-4 GeV/c
range. For p_{T} dependence we may need some more to study after
SPIN2023.
The other one is the event plane resolution. In the slides I mentioned
|eta|< 0.5, but actually I use |eta|<1 in the analysis.
I listed my cuts and event plane resolution, Subhash’s result as well
as STAR blind analysis's result in the slides. It is more or less
consistent with each other.

Please look more details in this link.
https://drupal.star.bnl.gov/STAR/system/files/jpsiSpinAlignment_20230920.pdf

Qian Yang

On 2023-09-18 21:40, tc88qy via Star-fcv-l wrote:
Hello Subhash and all

I want to give an update on J/psi spin alignment study in isobar
data. This update has been shown in last week's HP-PWG meeting. Please
find slides in this link:
https://drupal.star.bnl.gov/STAR/system/files/jpsiSpinAlignment_20230914.pdf
I also got some comments from HP meeting. I did some study and
prepared few slides after HP-PWG meeting, you can find it in this
link:
https://drupal.star.bnl.gov/STAR/system/files/jpsiSpinAlignment_20230917.pdf
If it is all ok, I want request preliminary for this study for the
coming SPIN2023 meeting which is next week.
The preliminary request has been sent to HP mail list. You can find
the slides in this link:

https://drupal.star.bnl.gov/STAR/system/files/Preliminary_figures_request_1.pdf

Qian Yang

On 2023-09-18 18:26, subhash via Star-fcv-l wrote:
Dear All,

We shall have our weekly FCV PWG meeting this Wednesday (20/Sept/2023)
at 9:30 AM EDT. If you would like to present please let us know.
Please try posting your slides by Tuesday. The agenda will be
collected at: https://drupal.star.bnl.gov/STAR/blog/jjiastar/bulkcorr

Zoom details are copied below.

Thanks and regards,
Prithwish, Zhenyu and Subhash


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