STAR Flow, Chirality and Vorticity PWG

[Tongzhou Guo <tongzhou.guo AT stonybrook.edu>]

Dear ShinIchi,

Thanks for your questions! I'd like to talk about the problems for p6 and p8 firstly.

Yes, for the plot in p8, only one black eta selection is the same as p6. Actually, there are 16 selections in total for each energy (27 and 54 GeV). I selected 5 of them for 27 and 54 GeV respectively in p6, as you can see. That's because I think these 5 selections are relatively clearer. 

But to make a comparison with results from ALICE, I select the same 4 eta regions for their results, and indeed, 3 of them are not included in p6. You pointed out "the legend black/red and  green/blue presented in a different ways, left<right and left>right". Really thanks! That's because I made mistakes for the green and blue legend. They should not be "0.7>|#eta|>0.5" and "0.9>|#eta|>0.5", but "0.3<|#eta|<0.5" and "0.0<|#eta|<0.2", the same with selections in ALICE's plot. I'll correct them. 

I do have some doubts for central collision events. The number of events is small for this region (especially for mRefMult>420), so I didn't include them in p6. But to make a comparison with ALICE's plot, I applied all the centralities in p8.

Do you have further suggestions for the present different selections between p6 and p8? I'll also reply to your questions for p7 soon.

Best regards,

Tongzhou

On Fri, Apr 16, 2021 at 12:19 PM ShinIchi Esumi via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:

Dear Tongzhou

Thanks for the update, the results shown in p6 is clearly improved. 

I wonder if there is any comparison of the 2 particle covariance correlation 

p7 with the previous star analysis, maybe at different beam energies? Do 

you still like to make it (especially in central region) as preliminary, although 

you might think it is affected by some possible detector/experimental problems 

like two close track resolution at (0,0) in central. Please keep in mind, if you 

make it as preliminary, we can not change anymore until it is finally published 

in journal, so I would not even try, if you already know there is a problem. 

The same comment on the bottom left plot on p8, where you’ve excluded 

central region in earlier slides and only one black eta selection is same as 

p6. What is the additional message on this plot compared to p6? Is this to 

point out the possible problem in central? Why the legend black/red and 

green/blue presented in a different ways, left<right and left>right? 

Best regards, ShinIchi

On Apr 16, 2021, at 16:52, Tongzhou Guo <tongzhou.guo AT stonybrook.edu> wrote:

Dear ShinIchi 

Really thanks for your previous questions, they're very helpful for the improvement of my slides.

I've done some updates, please find my slides at the same link

https://drupal.star.bnl.gov/STAR/presentations/aps-april-meeting-2021/energy-and-centrality-dependence-forward-backward-transverse-mo

I believe this is still far from complete. Questions and comments are very welcomed.

Best regards,

Tongzhou

On Wed, Apr 14, 2021 at 12:29 PM Tongzhou Guo <tongzhou.guo AT stonybrook.edu> wrote:

Thanks for your questions!

(1). That's right. Actually, the number of events are different between two energy levels, and I'll update the plots and mark the number of events. Otherwise the statistical errors are not meaningful.

(2). Right, the top-middle panel in p5 is a part of the same data in p8. Their statistical errors are the same, but due to the marker size, this is not very clear. Maybe I should modify the marker size for p5 because it's too big. Yes, I should include systematics for all plots. To make a comparison with the results for 27 GeV, I also exclude the high multiplicity regions for 54 GeV results. The number of events of high multiplicity region is not enough for 27 GeV, so that the statistical error bars are very long for this region and the average value of the pearson coefficient is meaningless.

(3). Yes, I should learn more on the reasons for the crossing effect of 27 GeV, as well as the proper selection to describe centralities. 

In total, I'll delete some plots and add more physical discussions and update my slides soon.

Best regards,

Tongzhou 

On Tue, Apr 13, 2021 at 10:40 PM ShinIchi Esumi via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:

Dear Tongzhou
Thank you for the interesting results, I have a few questions.
Are you request preliminary for all these plots in the slides for APS meeting?

(1) The statistical errors should be given by the number of events, not the total
number of tracks, right? Does the used event statistics reflect the size of the
statistical errors between 54 and 27GeV data? What are the number of events
used for these 2 data sets?

(2) The top-middle panel in p5 is a part of same data in p8, right, where you
have excluded the central events, because of some experimental problems,
like pile-up etc? Do they have same statical errors on the both pages? If you
have already systematic error estimation, why don’t you include in other pages?
Do you have convincing reason how you have decided to exclude the high
multiplicity region?

(3) The trends for two energies are similar, but the different eta gaps approach
at higher multiplicity for 54GeV, but they cross for 27GeV, do you know why?
You have used RefMult in the PWG, which is now shown as Nch, are they
same number? What if you plot and compare them as a function of centrality?

Best regards, ShinIchi

> On Apr 14, 2021, at 8:32, webmaster--- via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:
>
> Dear star-fcv-l AT lists.bnl.gov members,
>
> Tongzhou Guo (tongzhou.guo AT stonybrook.edu) has submitted a material for a 
> review, please have a look:
> https://drupal.star.bnl.gov/STAR/node/54656
>
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