STAR Flow, Chirality and Vorticity PWG

[Prithwish Tribedy <ptribedy AT rcf.rhic.bnl.gov>]

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