STAR Flow, Chirality and Vorticity PWG

["Zuowen Liu" <zuowen.liu AT qq.com>]

Dear Subhash and All,

Thank you for the reply.

The Fig. 42 you mentioned might be an old plot.

Please find the new AN in the updated one:

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

And the draft is also updated: https://drupal.star.bnl.gov/STAR/system/files/Kaon_AntiFlow.pdf

v1(y) in small pT bins also can be found in slide 3, there is no obvious discontinuous unlike v1(y) in the wide pT bin (slide 2).

I don't think the possible discontinuous in the for-rapidity (pT > 0.7) would impact on the physic message we deliver. Because cubic fitting is applied, the for-rapidity v1 is described by the cubic term.

But we focus on dv1/dy in the mid-rapidity in this analysis.

We can't discard v1 at low pT (pT < 0.6), since anti-flow is only observed at low pT.

Anyway, I will redo the PID study for Kaon. It might be the most possible issue from my side.

Thank you again for your prudence.

Best regards,

Zuowen for PAs

------------------ Original ------------------

From: "subhash" <subhash AT rcf.rhic.bnl.gov>;

Date: Tue, Apr 23, 2024 09:32 AM

To: "Zuowen Liu"<zuowen.liu AT qq.com>;

Cc: "star-fcv-l"<star-fcv-l AT lists.bnl.gov>;"liuzw"<liuzw AT mails.ccnu.edu.cn>;

Subject: Re: [Star-fcv-l] Kaon anti-flow paper draft and analysis notes for PWG review

Dear Zuowen, PAs,

Thanks again for your response. We are a bit uncomfortable with this
kaon data and feel that the present trend is beyond statistical
fluctuation. We suggest the PAs investigate the reason for this
discontinuity or propose some solution.

I am checking v1 versus y in smaller pt bins (Fig. 42 of AN), there is a
non-trivial trend especially obvious at pt= 0.4-0.6 GeV. I would suggest
to look differentially in (pt, eta) to understand the reason. Also in a
hypothetical scenario, if we remove problematic bins (eg stay within
y_cm < 0.5 or pt > 0.6), how would it impact our significance and
physics message?

In the next iteration, please also circulate updated version of AN and
draft.

Thanks and regards,
Subhash

On 2024-04-22 04:02 PM, Zuowen Liu wrote:
> Dear Subhash,
>
> Thanks a lot for your quick reply.
> Kindly find the answers in the slides attached.
> Thank you.
>
> Best regards,
> Zuowen for PAs
>
> ------------------ Original ------------------
>
> From:  "subhash"<subhash AT rcf.rhic.bnl.gov>;
> Date:  Thu, Apr 18, 2024 01:46 PM
> To:  "Zuowen Liu"<liuzw AT mails.ccnu.edu.cn>;
> Cc:  "star-fcv-l"<star-fcv-l AT lists.bnl.gov>;
> Subject:  Re: [Star-fcv-l] Kaon anti-flow paper draft and analysis
> notes for PWG review
>
> Dear Zuowen,
>
> Thanks for your response. I have a few follow up questions/comments:
>
> 1) Kaon v1: your negative kaon points especially at 3.5 GeV are kind
> of
> fluctuating bin by bin, they look a lot smoother in 3 GeV data. The
> systematic is also changing bin-by-bin. Since this paper is focussed
> on
> kaons, I wanted to understand more on this behavior of K+ and K-. How
> do
> you understand the current behavior.
> 2) Proton v1: I am fine with it, please update all the latest version
> of
> figures.
> 3) v1 versus invariant mass for kshort: I would suggest to check the
> variation with background shape eg first/second order polynomial.
> 4) incompressibility: do you use K=210 (soft EOS) for all the
> energies?
> If I remember in our prior 3 GeV paper, we used K=380 (I believe hard
> EOS).
> I would suggest to mention K values used in JAM in the main
> manuscript.
> 5) Since you are aiming for a letter, you don't have space. So I
> suggested to include event plane resolution and v1 versus pt figures
> as
> a supplemental materials to PRL.
> 6) around 196-197 of the draft, you should clarify that W/O spectator
> is
> the case where spectator interactions are turned off in JAM.
>
> Thanks and regards,
> Subhash
>
> On 2024-04-17 04:09 PM, Zuowen Liu wrote:
>> Dear Subhash and All,
>>
>> Thank you very much for your nice suggestions.
>> Please find the answers in the slides attached.
>>
>> Kindly let us know if you have any further comments or suggestions.
>>
>> Thanks and Best regards,
>> Zuowen for PAs
>>
>> ------------------ Original ------------------
>>
>> From:  "subhash"<subhash AT rcf.rhic.bnl.gov>;
>> Date:  Sun, Apr 14, 2024 06:28 PM
>> To:  "star-fcv-l"<star-fcv-l AT lists.bnl.gov>;
>> Cc:  "Zuowen Liu"<liuzw AT mails.ccnu.edu.cn>;
>> Subject:  Re: [Star-fcv-l] Kaon anti-flow paper draft and analysis
>> notes for PWG review
>>
>> 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
>>> _______________________________________________
>>> Star-fcv-l mailing list
>>> Star-fcv-l AT lists.bnl.gov
>>> https://lists.bnl.gov/mailman/listinfo/star-fcv-l

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