STAR Flow, Chirality and Vorticity PWG

[EsumiShinIchi <esumi.shinichi.gn AT u.tsukuba.ac.jp>]

Dear Prithwish and Diyu
Thank you very much for the suggestions, ALICE D0-D0bar are already included. 
Let’s discuss whether we want to move this to Friday or not. I’ll try to 
include 
the Lambda results. 
Best regards, ShinIchi

> 2024/12/02 10:48、Diyu Shen <dyshen AT fudan.edu.cn>のメール:
> 
> Hi Prithwish and ShinIchi,
> 
> I think for this topic it is necessary to include all the results in 
> heavy-ion experiment, not only from STAR but also from ALICE.
> So I would suggest to discuss D meson splitting observed by ALICE after 
> point 5.
> 
> Say D-Dbar results show 2.8 sigma splitting, despite D’s have no electrical 
> charge — challenges naive EM-field explanation.
> 
> Best,
> Diyu
> 
> 
>> On Dec 2, 2024, at 05:05, Prithwish Tribedy <ptribedy AT rcf.rhic.bnl.gov> 
>> wrote:
>> 
>> Hi ShinIchi and all,
>> Thank you for the excellent compilation! Should we consider moving your 
>> v1​ talk to Friday? This would allow you to include both public and STAR 
>> internal results, providing more flexibility to address key issues that 
>> support or challenge EM-field explanations. I list a few points for you to 
>> consider on both support and apparent challenge to EM-field explanations:
>> 
>>   1. Proton results change sign with centrality across all energies -- 
>> supports naive EM-field expectations
>>   2. Kaon results follow proton trends but are weaker -- supports EM-field 
>> if we assume strange quark behave differently
>>   3. Pion results align with protons/kaons at low energies, 
>> pion-proton-kaon all showing same trend -- challenging transport-only 
>> explanations.
>>   4. Above (#3) may not be the case for 200 GeV, it's unclear if pion 
>> results change sign like protons at 200 GeV -- points to something is 
>> missing in our understanding
>>   5. Net-ΛΛ results are almost on top of protons, despite Λ's have no 
>> electric charge -- challenges naive EM-field explanation
>>   6. Splitting increases with ΔqΔq, ΔBΔB, and ΔSΔS, if you assume NCQ 
>> scaling holds for produced particles -- supports both EM-field & has been 
>> explained by hydro models with baryon inhomogeneity
>>   8. NCQ scaling -- crucial but is hard to verify, attempt made for 
>> produced quarks only with limited significance, but there are proof that 
>> it does not hold for mixture of produced & transported quarks
>>   7. Hydro models explain proton data without EM fields -- challenging EM 
>> explanations
>>   8. Hydro models has not demonstrated that they can explain all PID data 
>> -- incompleteness to hydro models that challenge EM-field explanations
>>   9. Other models such as mean field -- I am not an expert but it's worth 
>> touching.
>> 
>> Overall, this is a fascinating topic that deserves lengthy discussion, so 
>> having it as the last talk of the day may not be ideal.
>> 
>> Let me know your thoughts!
>> 
>> Best,
>> Prithwish
>> 
>> 
>> On 2024-12-01 12:40, EsumiShinIchi wrote:
>>> Dear Rich, Subhash, Prithwish and all
>>> I send you the draft of my talk on v1 splitting with materials that
>>> are already in public,
>>> if you have any suggestions, please let me know. Thank you very much
>>> in advance.
>>> Best regards, ShinIchi
>>> https://drupal.star.bnl.gov/STAR/system/files/v1split_bes2star_Esumi_2024Dec04.pdf
>>>> Hi Everyone
>>>> I like Subash’s suggestion
>>>> To be clear it is now
>>>> Sooraj - v1, v2 (and v3?) of light and strange hadrons and
>>>> implications
>>>> Chengdong Han - light and hyper nuclei flow
>>>> Xingrui Gou - Global and local polarization in BES-II COL (note that
>>>> we intend to make FXT-polarization a separate talk)
>>>> Zhiwan Xu - Chiral effects (CME related) in BES-II and 200GeV
>>>> Shinichi - v1 splitting and possible interpretations
>>>> Pretty good. Hope we can fit it all in. I think at least Sooraj and
>>>> Shinichi’s talks should be in the open session with the theorists
>>>> -Rich
>>>>> Dear Sooraj, ShinIchi, Richard and Prithwish,
>>>>> My understanding is that we were looking for candidates whose
>>>>> talks could present an unbiased perspective on topics such as the
>>>>> onset of partonic collectivity (bringing together all viewpoints)
>>>>> and the electromagnetic field (covering both electromagnetic and
>>>>> non-electromagnetic scenarios). However, we did not reach a
>>>>> consensus on the EM-talk.
>>>>> Therefore, may I suggest having ShinIchi give a summary talk on
>>>>> the experimental results of v1-splitting from STAR (if possible
>>>>> and if you agree), followed by a theorist? I would recommend
>>>>> Sandeep Chatterjee to discuss v1 with hydrodynamics. He is an
>>>>> expert on v1 splitting due to EM (predicted D-meson v1 splitting)
>>>>> and non-electromagnetic scenario with baryon. This talk could be
>>>>> part of an open session, as most of our v1 results are public.
>>>>> Although I don't see much space in agenda to accommodate
>>>>> v1-splitting theory speaker,  I’m cc’ing ShinIchi here to get
>>>>> his opinion on this.
>>>>> The followings are rest of the talks from FCV:
>>>>> Sooraj - Summarizing v1, v2 of light and strange hadrons
>>>>> Chengdong Han - light and hyper nuclei flow
>>>>> Xingrui Gou - Global and local polarization in BES-II COL (note
>>>>> that we intend to make FXT-polarization a separate talk)
>>>>> Zhiwan Xu - Chiral effects (CME related) in BES-II and 200GeV
>>>>> Thanks and regards,
>>>>> Subhash
>