STAR Flow, Chirality and Vorticity PWG

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

Dear Subhash,

Please find the informations:

Title: Measurements of global polarization of Lambda (anti-Lambda) and 
Xi- (Xi+) hyperons in isobar collisions at sqrt(s_NN) = 200 GeV
Webpage: 
https://drupal.star.bnl.gov/STAR/blog/xgou/Paper-proposal-global-polarization-isobar-collisions-webpage
Paper Draft: 
https://drupal.star.bnl.gov/STAR/blog/xgou/Paper-proposal-global-polarization-isobar-collisions-webpage
Analysis Note: 
https://drupal.star.bnl.gov/STAR/blog/xgou/Paper-proposal-global-polarization-isobar-collisions-webpage
Analysis Code (RCF path): /star/u/xgou/pwg/Isobar/GPC_code
PA list: Xingrui Gou, Takafumi Niida, Sergei A. Voloshin, Zhenyu Chen, 
Qinghua Xu
PA representative: Xingrui Gou

Thank you very much.

 
Best regards,
Xingrui


> Dear Xingrui,
>
> Thanks for considering the suggestions. We will proceed requesting for
> GPC. Could you please send us the following informations with latest
> materials:
>
> Title:
> Webpage:
> Paper Draft:
> Analysis Note:
> Analysis Code (RCF path):
> PA list:
> PA representative:
>
> Thanks and regards,
> Subhash
>
> -------- Original Message --------
> Subject: Re: [[Star-fcv-l] ] Request for GPC formation: "Hyperon
> polarization in isobar Ru+Ru and Zr+Zr collisions at \snn = 200 GeV"
> Date: 2024-08-09 11:24 PM
> From: xgou <xgou 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>
> Reply-To: star-fcv-l AT lists.bnl.gov
>
> Dear Subhash,
>
> Thanks for your nice comments.
>
> I have made the suggested modifications to the figures.
>
> > About P_yc0 and P_yc2, I was wondering is there any motivation for
> > showing both of them. The measurements are very nice, I am wondering
> > is there any physics we can disentangle with these two values? Or is
> > it merely a cross-check.
> P_yc0 represents the global polarization obtained using different
> acceptance correction methods ("Method1 P_yc0" and "Method2 P_yc0"),
> which differ from the classic acceptance correction method ("PH"). In
> the classic method, we assume the Lambda distribution in the
> transverse plane is uniform. However, in the new acceptance correction
> method, it is considered that the global polarization distribution of
> Lambda in the transverse plane may be non-uniform and influenced by
> elliptic flow, taking into account factors such as the azimuthal angle
> dependence of the polarization. Therefore, Figure 7 serves as a
> cross-check for these acceptance correction methods.
> P_yc2 reflects the phi dependence of global polarization after
> acceptance correction.
> P_yc0 and P_yc2 represent different observations.
>
> > line 349: Could you remind me which paper or analysis [61] are you 
> > referring to?
> The analysis in [61] refers to arXiv:2311.09698v1, which is Vipul’s
> proceedings. I have updated the reference accordingly.
>
> > Fig. 9: How do you do the average for 20-50% centrality? I see the
> > Xi-via daughter (blue) are consistently larger than zero, while direct
> > Xi's (red) are smaller than zero. But when you averaged the pattern
> > flipped. Can you double check.
> Sorry for the mistake with the colors, The error has now been 
> corrected.
>
> > Can we compare the xi-polarization between isobar and Au+Au, although
> > the error bar may not allow but I was wondering where they stand,
> > especially Xi-via-daughter?
> For Xi-via-daughter:
> In isobar: P_{\Xi}(%) = 0.61 ± 0.21 (stat.) ± 0.04 (syst.)
> In Au+Au: P_{\Xi}(%) = 0.63 ± 0.11 (stat.) ± 0.26 (syst.)
> I have included the comparison figure in the analysis note.
>
> > I would also suggest preparing supplemental data points or figures for
> > lambda anti-lambda polarization separately for Ru+Ru and Zr+Zr. This
> > would be important for someone outside STAR who don't have access to
> > individuals collision species.
> The values for Lambda and anti-Lambda polarization for Ru+Ru and Zr+Zr
> are listed in lines 281-284, so we have not included these data points
> in the figure.
>
> Please let me know if there are any further suggestions or
> clarifications needed.
> The latest draft of the paper can be found here:
> https://drupal.star.bnl.gov/STAR/blog/xgou/Paper-proposal-global-polarization-isobar-collisions-webpage
>
> Thank you very much.
>
> Best regards,
> Xingrui
>
>
> > Dear Xingrui, PAs,
> >
> > It is great to see the isobar global polarization paper getting ready.
> > I have a few comments for your consideration:
> >
> > Fig. 1: Are these only fit lines.  It might be good, if you draw them
> > as points. Also make sure X,Y axis are not touching the labels.
> >
> > Fig. 4-5: In data/model comparison figures, you have four cases Lambda
> > and s-quark  scenario for lambda and anti-lambda in different colors,
> > it would be good to label the model in a better way or at least
> > mention the color coding in the caption.
> >
> > Azimuthal angle dependence line 332-336: I think we should not discuss
> > the STAR preliminary results in a paper. Although it is a pity that we
> > don't have P_yc2 from Au+Au published yet.
> >
> > About P_yc0 and P_yc2, I was wondering is there any motivation for
> > showing both of them. The measurements are very nice, I am wondering
> > is there any physics we can disentangle with these two values? Or is
> > it merely a cross-check.
> >
> > line 349: Could you remind me which paper or analysis [61] are you 
> > referring to?
> >
> > Fig. 9: How do you do the average for 20-50% centrality? I see the
> > Xi-via daughter (blue) are consistently larger than zero, while direct
> > Xi's (red) are smaller than zero. But when you averaged the pattern
> > flipped. Can you double check.
> > Can we comapre the xi-polarization between isobar and Au+Au, although
> > the error bar may not allow but I was wondering where they stand,
> > especially Xi-via-daughter?
> >
> > I would also suggest preparing supplemental data points or figures for
> > lambda anti-lambda polarization separately for Ru+Ru and Zr+Zr. This
> > would be important for someone outside STAR who don't have access to
> > individuals collision species.
> >
> >
> > I sign-off with these addressed.
> >
> > Thanks and regards,
> > Subhash
> >
> >
> > On 2024-07-30 09:37 AM, xgou wrote:
> > > Dear conveners,
> > >
> > >   I hope this email finds you well.
> > >
> > >   It has been over two weeks since I submitted the GPC request, and I
> > > am writing to inquire about its current status. Could you kindly
> > > inform me if there has been any progress in the review process?
> > >
> > >   Additionally, please let me know if there are any further materials
> > > or information I need to provide to facilitate the evaluation.
> > >
> > >   Thank you very much. I look forward to your response.
> > >
> > > Best regards,
> > > Xingrui
> > >
> > > > Dear FCV Conveners,
> > > >
> > > >   We would like to request the GPC formation for our paper titled
> > > > "Hyperon Polarization in Isobar Ru+Ru and Zr+Zr Collisions at \snn =
> > > > 200 GeV." Our target journal for this submission is Physics Letters 
> > > > B
> > > > (PLB).
> > > >
> > > >   The latest draft of the paper can be found here:
> > > >
> > > > https://drupal.star.bnl.gov/STAR/system/files/STAR_Isobar_Polarization%20%285%29.pdf
> > > >
> > > >   The latest draft of analysis note can be found here:
> > > >   
> > > > https://drupal.star.bnl.gov/STAR/system/files/AnalysisNote_isobarPH_v2_0.pdf
> > > >
> > > >   Additionally, the paper proposal blog, which includes the proposed
> > > > figures, paper draft, analysis note, and other relevant details, can
> > > > be accessed here：
> > > >
> > > > https://drupal.star.bnl.gov/STAR/blog/xgou/Paper-proposal-global-polarization-isobar-collisions-webpage
> > > >
> > > >   Please let us know if you have any comments or suggestions from 
> > > > your
> > > > end so that we can proceed with moving this paper towards 
> > > > publication.
> > > >
> > > >
> > > > Sincerely,
> > > > Xingrui Gou