STAR Flow, Chirality and Vorticity PWG

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

Dear Zuowen, PAs,

Sorry for the delay. Thanks a lot for circulating this interesting paper 
and supporting materials. Overall, we have everything to move forward. 
But I have the following question/comments for your consideration:


--------------------------------------------------
Analysis Note:

Major:
-- As seen in Fig 59 and 60, the kaon-minus v1 have a discontinuity at 
around y_cm ~ -0.7. It is also part of your main figure in paper. What I 
remember you have mentioned in some presentation that there was some 
issue in mass-square in eToF. Was it related and can you please remind 
me again how it was solved/addressed?

-- page-46: Fig. 65: The proton v1 has a bump structure at around ycm ~ 
-0.4. How do you understand it? Do you see a same structure for lambda?

-- page-11: You should have purity numbers for all your PIDs, please add 
them in your note. Note that there was a recent presentation from 
Cameron Racz on the effect of proton purity on v3. Can this affect your 
analysis?

-- page-24: Fig. 24: Can you add a few more example figures for your v1 
versus invariant mass for kshort and lambda, may be in the Appendix 
section of AN? Please also add discussion how is v1 the background shape 
is considered. Have you varied v1^background to get systematic on v1 for 
kshort and lambda?
--------------------------------------------------


--------------------------------------------------
Paper draft:

Major comments:
-- If I understand correctly, the main selling point of this paper is 
the observation of anti-flow for pions and kaons at low pT. This 
manuscript do not rule out the kaon potential causing anti-flow for 
kaons, but concluded that it could also be driven by nuclear shadowing.

abstract: If it is a first time simultaneous observation of anti-flow of 
pions/kaons we could probably stress explicitly in the abstract in a 
data driven way (what you did around #l 188-190) and then mention it is 
_supported_ by JAM.
l#16: It is concluded --> It is supported, since you haven't ruled out 
kaon potential picture.
Is there a way in JAM to demonstrate the sign change in pions/kaons 
_solely_ from nuclear shadowing, so that you can rule out one picture. 
That might make this paper sending a stronger message.

-- Compared to our 3 GeV PLB paper (2108.00908), what information it can 
bring in terms of baryonic mean-field. Because now we have p/lambda v1 
for four different beam energies. It could be added in the conclusion, 
eg what compressibility values are used.

-- Please double check the Kaon data points at 3.5 GeV as I mentioned 
above.

-- I remember there was some discrepancies in two versions of JAM. Which 
version are you using? And it should be pointed out in the manuscript if 
results from JAM (version dependent) changed compared to our previous 
publication.

-- You would need a few supplemental figures to discuss on the event 
plane and its resolutions.

-- You could also think about reporting v1 versus pt in your 
supplemental materials.

Minor suggestions:
-- Please check notations, sometimes you use "protons" some times "p". 
For instance l#77

-- Fig. 4: You should mention rapidity coverages inside the figures, 
although you are presenting dv1/dy
You could draw pi+ as markers, not to confuse with models. You can play 
with color coding.

-- l#196: w/O spectator, have you turned off spectator interactions? 
Sorry for my ignorance, but I wanted to understand how it was done in 
JAM.



Thanks and regards,
Subhash

On 2024-04-08 03:06 PM, Zuowen Liu via Star-fcv-l wrote:
> Dear Conveners and All,
>
> Here we update some materials for PWG review.
> Please let us know any comments and suggestions you may have.
> Thank you.
>
> -Paper draft:
> https://drupal.star.bnl.gov/STAR/system/files/Kaon_AntiFlow.pdf
>
> -Analysis notes:
> https://drupal.star.bnl.gov/STAR/system/files/analysisnote_kaonantiflow.pdf
> -Analysis code in rcf:
> /star/u/liuzw/pwg/kaonAntiflow
> -Summary page on drupal:
> https://drupal.star.bnl.gov/STAR/blog/liuzw/Paper-proposal-kaon-anti-flow
> -Replies to pwgc preview comments:
> https://drupal.star.bnl.gov/STAR/system/files/PWGC_preview_kaon_antiflow_ver2.pdf
>
> Best regards,
> Zuowen for PAs
>
> ------------------ Original ------------------
>
> From:  "Zuowen Liu"<liuzw AT mails.ccnu.edu.cn>;
> Date:  Wed, Feb 28, 2024 03:47 PM
> To:  "star-fcv-l"<star-fcv-l AT lists.bnl.gov>;
>
> Subject:  Kaon anti-flow paper draft and analysis notes for PWG review
>
> Dear All,
>
> The paper daft and analysis notes for Measurements of Kaon Anti-flow
> in the High Baryon Density Region from Au + Au Collisions at √sNN =
> 3 - 3.9 GeV are ready for PWG review.
>
> -Paper draft:
> https://drupal.star.bnl.gov/STAR/system/files/Kaon_AntiFlow.pdf
>
> -Analysis notes:
> https://drupal.star.bnl.gov/STAR/system/files/analysisnote_kaonantiflow.pdf
> -Summary page on drupal:
> https://drupal.star.bnl.gov/STAR/blog/liuzw/Paper-proposal-kaon-anti-flow
>
> We’re looking forward to your comments and suggestions.
> Thank you!
>
> Best regards,
> Zuowen for PAs
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