STAR Flow, Chirality and Vorticity PWG

[xibaoshan AT fudan.edu.cn]

Dear Fuqiang and Subhash,

Thanks a lot for your nice suggestions.

Regarding Fuqiang's comments on the rho spin alignment on CME, We acknowledge 
that the conclusion drawn in PLB 839 137777 is specific to the original ∆γ112 
observable, and the impact on the other derived version of ∆γ112 needs 
further dedicated study. For the specific case you mentioned, the 
spectator/participant plane ratio, it depends on the ratio of ρ00 measured 
with respect to the two planes. If the spectator/participant plane ratio of 
ρ00 is above 1, resembling the CME expectation, then the ratio of ∆γ112 is 
affected. We therefore think the the following is more appropriate: 
“Conversely, the influence of ρ00 on the CME-background-control method, such 
as the spectator/participant plane ratio of the CME observables or the event 
shape engineering, requires further dedicated investigation.”

Regarding your inquiry referring to the 1st and 2nd EP results in Fig. 1, 
strictly speaking, it is not a simple ratio relation. Unlike the shape caused 
by elliptic flow, the global spin alignment's shape is a 3D structure. The 
off-diagonal terms in spin density matrix may introduce additional effects in 
3D. Since these effects are not considerations of 2D, as in elliptic flow, 
there can be differences when transition from SP to PP.

The error band associated with theory curve is removed.

At the same time, modifications were made according to Subhash's suggestions, 
and the answers to the questions are as follows:

" This observed phenomenon may be attributed to larger fluctuations in the 
direction perpendicular to the motion direction"
 --> Do you mean larger fluctuation in transverse direction than in 
longitudinal?

A: Yes, but it is local fluctuation.

I have revised the draft of the proceedings at the same link:

https://drupal.star.bnl.gov/STAR/presentations/Quark-Matter-2023/New-Insights-Global-Spin-Alignment-Vector-Mesons-Heavy-Ion-Collisi-0

Thanks again for your great help.

Best,
Baoshan


> -----原始邮件-----
> 发件人: "subhash via Star-fcv-l" <star-fcv-l AT lists.bnl.gov>
> 发送时间:2023-11-24 12:10:50 (星期五)
> 收件人: "STAR Flow, Chirality and Vorticity PWG" <star-fcv-l AT lists.bnl.gov>
> 抄送: subhash <subhash AT rcf.rhic.bnl.gov>
> 主题: Re: [Star-fcv-l] STAR presentation by Baoshan Xi for Quark Matter 2023 
> submitted for review
> 
> Dear Baoshan,
> 
> Nicely written proceedings. I have a few suggestions below for your 
> consideration:
> 
> Title: you might consider adding RHIC or STAR.
> 
> Abstract:
> -------------------
> You can probably re-arrange the sentences (by clubbing similar topics) 
> in the abstract so reads smooth. Here is what I would suggest:
> 
> After "In this proceeding, we present new measurements of the global 
> spin alignment of ϕ mesons using .... √sNN = 200 GeV."
> add this following sentence
> "The energy-dependent results of ϕ mesons measured with BES-II data are 
> consistent with those published in BES-I, with a smaller margin of 
> error."
> --> The energy-dependent spin alignment for ϕ mesons from BES-II data is 
> consistent with that published from BES-I and showcasing a significant 
> improvement in precision.
> 
> "Concurrently, our new measurement of rapidity dependence exhibits a 
> trend in line with theoretical predictions."
> --> We performed a new measurement assessing the rapidity dependence of 
> phi meson \rho_00, and our findings are consistent with theoretical 
> predictions.
> 
> Then add:
> "The global spin alignment of J/ψ mesons aligns with a value of 1/3 
> within the statistical error."
> --> The global spin alignment of J/ψ mesons with respect to first order 
> event plane aligns with a value of 1/3 within the statistical error.
> 
> Then add:
> "Additionally, we provide a brief introduction to the study of the 
> global spin alignment of ρ0 mesons" & "We discuss our procedure to 
> measure the global spin alignment of ρ
> 0 mesons and offer predictions for measurement errors." can be combined:
> --> Additionally, we discuss the procedure of measuring the global spin 
> alignment of ρ0 mesons at RHIC and provide the projection for errors.
> 
> 
> "In this proceeding" --> In these proceedings,
> "a center-of-mass energy of" --> can be be removed
> "global spin alignment of ϕ mesons using BES-II data" --> global spin 
> alignment (\rho_00) of ϕ mesons using BES-II data
> 
> 
> 1 Introduction
> -------------------
> "This angular momentum gives rise to a vorticity field within the 
> system."
> --> This angular momentum results in the formation of a vorticity field 
> within the system.
> 
> "provides valuable insights "
> --> can provide valuable insights
> 
> 
> 2 Analysis method
> -------------------
> "using embedding technology"
> --> using embedding technique
> 
> 
> 3 Results
> -------------------
> "Notably, there was no significant difference observed in the physics 
> contribution concerning the participant plane and spectator plane"
> --> I think EP decorrelation correction needed to mentioned. How about:
> Notably, there was no significant difference observed in the physics 
> contribution concerning the participant plane and spectator plane, when 
> the decorrelation effect in event plane is taken into consideration.
> 
> " This observed phenomenon may be attributed to larger fluctuations in 
> the direction perpendicular to the motion direction"
> --> Do you mean larger fluctuation in transverse direction than in 
> longitudinal?
> 
> "first-order event plane of isobars at 200 GeV"
> --> first-order event plane in isobars collisions at sNN = 200 GeV
> 
> "RuRu" --> Ru+Ru
> "ZrZr" --> Zr+Zr
> "AuAu" --> Au+Au
> 
> 
> 4 Summary
> -------------------
> "In this study," --> In these proceedings,
> 
> " The J/ψ global spin alignment" -->  The J/ψ global spin alignment with 
> respect to first order event plane
> 
> 
> Thanks and regards,
> Subhash
> 
> On 2023-11-20 02:31 PM, webmaster--- via Star-fcv-l wrote:
> > Dear star-fcv-l AT lists.bnl.gov members,
> > 
> > Baoshan Xi (xibaoshan AT fudan.edu.cn) has submitted a material for a 
> > review,
> > please have a look:
> > https://drupal.star.bnl.gov/STAR/node/66045
> > 
> > ---
> > If you have any problems with the review process, please contact
> > webmaster AT www.star.bnl.gov
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