STAR Flow, Chirality and Vorticity PWG

[Chunjian Zhang <chun-jian.zhang AT stonybrook.edu>]

Dear Gang,

Hello. Thank your considering my comments. Thank you.

Best regards 

Chunjian 

On Oct 29, 2021, at 2:27 PM, Gang Wang via Star-cme-focusgroup-l <star-cme-focusgroup-l AT lists.bnl.gov> wrote:

Hi, Chunjian

Thanks for the comments.

I'll make it more clear that the replotted figures are my personal view.

I'll add the google link to your talk on the v2 ratio slide.

Gang Wang
Department of Physics & Astronomy
UCLA

---

From: "Chunjian Zhang" <chun-jian.zhang AT stonybrook.edu>
To: "ShinIchi Esumi" <esumi.shinichi.gn AT u.tsukuba.ac.jp>, "STAR Flow, Chirality and Vorticity PWG" <star-fcv-l AT lists.bnl.gov>
Cc: gwang AT physics.ucla.edu, "Star-Cme-Focusgroup-L" <star-cme-focusgroup-l AT lists.bnl.gov>
Sent: Friday, October 29, 2021 7:40:14 AM
Subject: Re: [Star-fcv-l] For Chunjian : [Star-cme-focusgroup-l] chirality workshop talk -- Gang Wang

Dear Shinlchi,

Hello. Thank you for reminder. I will plot this and send a request for the next week FCV slot to present it in the weekend. Thank you.

I have two personal comments on Gang’s slides. 

1) It’s a good plot but use “replotted” with STAR Isobar blind analysis in the same plotting style is strange to people who was not in the conference but look at your slides later. Does is mean STAR CME paper was changed now? Of course using the centrality and Nch, the results are changed as you shown in plots. But the message need to be clearly noted in the slides  which is your personal replotted isobar plots. 

2) Also, It will be good if Gang can mention this as we presented in APS DNP https://meetings.aps.org/Meeting/DNP21/Session/EE.7 

Best regards 

Chunjian 

On Oct 29, 2021, at 10:24 AM, ShinIchi Esumi via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:

Dear Chunjian

I hope you remember our intensive discussions before your DNP presentation 

and to clarify in one of the coming pwg meetings especially about the centrality/

multiplicity shifting effect between two isobar systems as well as the centrality 

bin width effect simultaneously. 

Best regards, ShinIchi

PS : Gang, I forgot to mention at the end of my last E-mail (to CME-focus-list) that 

I’m OK, if other members/analyzers in the CME focus group agree with your talk. 

Begin forwarded message:

From: ShinIchi Esumi via Star-cme-focusgroup-l <star-cme-focusgroup-l AT lists.bnl.gov>

Subject: Re: [Star-cme-focusgroup-l] chirality workshop talk -- Gang Wang

Date: October 29, 2021 23:03:14 JST

To: star-cme-focusgroup-l AT lists.bnl.gov

Reply-To: ShinIchi Esumi <esumi.shinichi.gn AT u.tsukuba.ac.jp>, star-cme-focusgroup-l AT lists.bnl.gov

Dear Gang

Thanks for the clarification (and sorry for missing your backup explanation earlier), it’s good 

to know that can be done just by the data provided in the submitted arXiv data, so that even 

theorists can do this conversion, while since you are one of the collaborators/analyzers, therefore 

you could have tried to do it right to make it as preliminary as you also say what you do now is 

not the best, as also Jiangyong pointed out, which is not just the shifting effect between two systems… 

Dear Jiangyong

I have not really convinced yet to compare two different plots from the two different presentations, 

although it’s given by the same person. So as we have discussed with Chunjiang just before the 

DNP, we are still waiting for the final apple-to-apple comparison in the PWG soon as Chunjian has 

agreed to... This is especially to discuss more about the centrality/multiplicity shifting effect between 

two isobar systems as well as the centrality bin width effect. I hope Chunjian remembers this and 

to discuss more in detail in one of the coming PWG meetings. 

Best regards, ShinIchi

On Oct 29, 2021, at 20:34, Jiangyong Jia via Star-cme-focusgroup-l <star-cme-focusgroup-l AT lists.bnl.gov> wrote:

Hi, Gang,

The difference you see between left panel and right panel is because the 5% or 10% centrality bin width is too wide, which leads to significant centrality bin width correction: <A>/<B>  and <A/B> are not the same.

It turns out if we use very narrow centrality bins, the ratio based on <Ntrk> or centrality have identical trends. This was shown by Chunjian explicitly (email attached below)

It would be good if you can mention this effect of using too wide centrality bin width.

thanks,

Jiangyong

Shinichi,

This was shown before on Aug 4 on slide 11 (solid circles)
https://drupal.star.bnl.gov/STAR/system/files/isobar_nuclear_deformation_0804_bulkcorr_czhang.pdf

which you can compare with top-left panel of slide 7 from last week
https://drupal.star.bnl.gov/STAR/system/files/isobar_nuclear_deformation_0929_Collmeeting_czhang_v3.pdf

you can see the difference without needing to plot them directly.

From: Gang Wang <gwang AT physics.ucla.edu>

Subject: Re: [Star-cme-focusgroup-l] chirality workshop talk -- Gang Wang

Date: October 29, 2021 14:18:04 JST

To: ShinIchi Esumi <esumi.shinichi.gn AT u.tsukuba.ac.jp>, star-cme-focusgroup-l AT lists.bnl.gov

Hi, ShinIchi

The upper panels of my "replotted" figures are based on Ntrk values in the table of the STAR isobar paper.

So it's some information completely accessible to public.

The lower panels do need some small projection/interpolation before taking the ratio,

and the procedure is explained in the backup slide.

As I mentioned in the summary slide, this is not the best way.

But before we do another measurement at matching multiplicity,

this gives us next-to-best estimate of the ratios.

Since this is not a STAR talk, such handling just reflects my personal practice.

Thanks 

Gang Wang
Department of Physics & Astronomy
UCLA

On 10/28/21 11:38 PM, ShinIchi Esumi via Star-cme-focusgroup-l wrote:

Dear Gang and CME folks 

When you change your x-axis from centrality to number of track, you would need to go back to the different 

event classifications based on the number of track, therefore the ratio does change significantly, just because 

of shifted scale between species as you are making ratio at different centralities between systems, although 

you say “repotted". So if the transformation is done properly, this should be OK, but since this transformation 

can not be done just by the information from the published data from arXiv, so I just wanted to make sure 

whether this is all agreed within the CME group or not...

Best regards, ShinIchi

PS : For Chunjian’s preliminary results for v2, v3 (and mean pT) ratios between systems for DNP, we have 

discussed a lot about this in the PWG and have given a new preliminary for him... 

On Oct 29, 2021, at 12:14, Takafumi Niida via Star-cme-focusgroup-l <star-cme-focusgroup-l AT lists.bnl.gov> wrote:

Dear Gang,

Just one minor comment, the slide number gets strange after slide 10.

Best regards,

Takafumi

On Oct 29, 2021, at 3:15 AM, Gang Wang via Star-cme-focusgroup-l <star-cme-focusgroup-l AT lists.bnl.gov> wrote:

Hi, all

I was invited to give a presentation on STAr's isobar results at the Chirality Workshop next Monday.

Although it's not a STAr talk, I still pot the link as a courtesy

https://www.star.bnl.gov/protected/bulkcorr/rexwg/talk/2021/ChiralityWorkshop_GangWang_2021.pdf

Your comments are welcome.

Gang Wang
Department of Physics & Astronomy
UCLA

---

From: "Fuqiang via Star-cme-focusgroup-l Wang" <star-cme-focusgroup-l AT lists.bnl.gov>
To: star-cme-focusgroup-l AT lists.bnl.gov
Sent: Thursday, October 28, 2021 10:50:41 AM
Subject: [Star-cme-focusgroup-l] chirality workshop talk

Dear All,

  I was asked to present our Au+Au data at the chirality workshop next week. Please find my talk draft athttps://drupal.star.bnl.gov/STAR/node/56944

Your comments are very welcome.

  Best regards,

Fuqiang

  

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