STAR Flow, Chirality and Vorticity PWG

[Shengli Huang <shengli.huang AT stonybrook.edu>]

Dear ShinIchi,

    We do have the results from deta to 1.4 and the difference is already in the systematic uncertainties metioned in the draft. You can see it in the analysis note:

https://drupal.star.bnl.gov/STAR/starnotes/private/psn0750

The flow is driven by both multiplicity and eccentricity,  vn is roughly proportional to Nch^{1/3}/time{eccentricity}. Since we select the pAu with the same Nch as dAu, there is no such effect. And HeAu is around 30% more than dAu, and Nch effect is around 10% only for comparing HeAu and dAu.

If we compare the vn as Nch from peripheral to central, then vn will be dominated by Nch since eccentricity does not change much due sub-nucleon fluctuations. That is what we showed in QM

Thanks!

Shengli

On Mon, Aug 2, 2021 at 12:05 PM ShinIchi Esumi via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:

Dear Shengli and Roy

Thanks for the nice results and the paper that is almost ready. 

It might be the same thing as what you have been saying during 

the last QM19, that is more from the multiplicity effect rather than 

the initial geometry, but now you say it’s more sub-nucleon structure 

rather than the nucleon structure. I would still say both, since this is 

an experimental measurement. Anyway, thanks for the nice work. 

I hope we will have centrality dependence in the following-up paper 

as well as future one with wider delta_eta tests including EPD from 

this year.  By the way, do you have some more variations of this 

results with slightly increased (and decreased) delta_eta cuts, like 

>1.3 and >0.7 etc in addition to the current one with <1.0, that I 

hope to see in your analysis note. Thanks again. 

Best regards, ShinIchi 

On Aug 2, 2021, at 23:32, Shengli Huang via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:

Dear All,

    You can find the updated draft of small system flow after PWGC comments below: 

https://drupal.star.bnl.gov/STAR/system/files/STAR_small_system_short_paper-6_0.pdf

BTW: PWGC comments can be found here:

https://lists.bnl.gov/pipermail/star-fcv-l/Week-of-Mon-20210329/000730.html

Your comments are welcome!

Thanks!

Shengli

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