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star-fcv-l - Re: [Star-fcv-l] FCV PWG meeting on 19/June/2024 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 19/June/2024 Wed. 9:30 AM EDT

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  • From: subhash <subhash AT rcf.rhic.bnl.gov>
  • To: "STAR Flow, Chirality and Vorticity PWG" <star-fcv-l AT lists.bnl.gov>
  • Subject: Re: [Star-fcv-l] FCV PWG meeting on 19/June/2024 Wed. 9:30 AM EDT
  • Date: Thu, 04 Jul 2024 09:46:47 +0800
Dear Gaoguo, All,

Thanks for considering the suggestions. I have a few follow up comments:

Would you like to add these summary F_n slope versus energy/system size into the paper draft? The ATLAS paper mostly discussing their results using Fn versus centrality. If you shift x-axis slightly for the data points, it looks much cleaner than r_n plots. But it could be my bias.

BTW, you mentioned that you have estimated systematic error on F2 by fitting r_n vs eta with systematic errors. If you extract the F_n from r_n vs eta in each of your cut variations, and then recalculate systematic on the slope, how different will they be from this current values?

I don't recall if I asked this question during the fcv, but overall your systematic errors are large. Could you please remind me is there any dominant source? Also an example when you vary vz (or nhits) cuts, do you apply Barlow condition of statistical fluctuation?

I am not an expert on decorrelation but since this paper is aiming for PRL, I am of the opinion that additional of model comparison would be helpful, eg Glauber is expected to be computationally faster compared to AMPT/Hydro etc. These can provide some references how these data can constrain on initial conditions. At least I would like to know the intention of the PAs.

Thanks and regards,
Subhash



On 2024-06-22 11:40 AM, Gaoguo Yan via Star-fcv-l wrote:
Dear conveners,

I have presented paper proposal: Collision energy and system size
dependence of longitudinal flow de-correlation at RHIC at PWG-FCV
meeting. Below are responses to the PWG review.

Q1: Can you extract fit parameter?
A1: In our measurement, we used linear function to fit r_n versus eta.
I extracted parameter F_n(n=2,3) with centrality function in Au+Au
collisions at 19.6, 27, 54.4 and 200 GeV as well as isobar collisions
at 200 GeV. Though fitting the data points which only include
systematic uncertainty, I see the fitting error as systematic
uncertainty of F_n. You can find the in attachment.

Q2: What is the physical source of longitudinal flow de-correlation?
A2: Two sources: v_n asymmetry and event plane twist. Our observable
r_n can’t distinguish them. However, due to ATLAS has larger
acceptance and statistics, they defined a new observable, R_n that is
sensitive to the event plane twist effects. Though r_n and R_n, they
evaluate this two contributions. You can find more detail by this
reference: Eur. Phys. J. C 78 (2018) 2, 142. We have measured the R_n
in isobar but it has large uncertainty. You can find PWG-FCV meeting
link as below:
https://drupal.star.bnl.gov/STAR/system/files/20211110_isobar_FCV.pdf

Q3: What model results are available now?
A3: In RHIC energy, there is MC-Glauber, UrQMD and AMPT models
results. But those models have different pt range and reference eta
range and only focus on RHIC top energy. We can’t compare with them,
directly. We will discuss with theorist and add results of comparison
with model in our final results.

If I have missed any comments, please contact me. In additions, if
there are no more comments, I would like to apply for PWGC review.
Thanks a lot.

Best regards,
Gaoguo Yan

在 2024-06-19 18:50，Gaoguo Yan via Star-fcv-l 写道：
Dear all,

Please find my slides in today meeting at below link:
https://drupal.star.bnl.gov/STAR/blog/gyan/Paper_proposal_LDeCorr_energy_system

Best regards,
Gaoguo

在 2024-06-17 16:02，Gaoguo Yan via Star-fcv-l 写道：
Dear Conveners,

I would like to present paper proposal: Collison energy and syetem
size dependence of longitudinal flow de-correlation at RHIC. Please
add me to the agenda. Thanks a lot.

Best regards,
Gaoguo Yan

在 2024-06-17 15:30，subhash via Star-fcv-l 写道：
Dear All,

We shall have our weekly FCV PWG meeting this Wednesday (19/June/2024)
at 9:30 AM EDT. If you wish to present please let us know. The agenda
will be collected at:
https://drupal.star.bnl.gov/STAR/blog/jjiastar/bulkcorr
Please send us your slides by Tuesday. Zoom details are copied below.

Thanks and regards,
Prithwish, Zhenyu and Subhash


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