STAR Flow, Chirality and Vorticity PWG

["Feng, Yicheng" <feng216 AT purdue.edu>]

Hi ShinIchi,

Thank you very much for your email.

All your comments are very helpful to me.

I agree that the conventional method of simple averages is good and valid.

The Gaussian-center method brings in complications, and does not necessarily improve the calibration.

>From the current check, the beam tilt in further AuAu runs seems not to affect the ZDCSMD calibration too much.

And the simple-average method would still work well.

Sincerely,

Yicheng

---

From: EsumiShinIchi <esumi.shinichi.gn AT u.tsukuba.ac.jp>
Sent: Wednesday, April 19, 2023 2:00 PM
To: Feng, Yicheng <feng216 AT purdue.edu>; STAR Flow, Chirality and Vorticity PWG <star-fcv-l AT lists.bnl.gov>
Subject: Re: [Star-fcv-l] FCV PWG meeting on 19/April/2023 Wed. 9:30 AM EDT

 

---- External Email: Use caution with attachments, links, or sharing data ----

Dear Yicheng

I realized you were trying to re-center the integrated shower distribution, 

(which is in-deed the beam center calibration, but that is different from 

the re-centering of the event-plane or Q-vector), while we usually do the 

re-centering calibration of the shower center distribution (not the shower 

distribution itself), where the shower center (X, Y) position can be given 

in each event, that could be given by the Gaussian fitting to the shower

distribution in each event, or given by the simple average <X> and <Y> 

of the shower in each event, that you might like to compare. 

Another point is that you could use the width sigma_X and sigma_Y of 

the shower center distribution (again, not the shower distribution) to 

re-normalize the Q-vector like : 

X’ = (X_center - <X>) / sigma_X

Y’ = (Y_center - <Y>) / sigma_Y

I usually call this step as a re-centering, which should already remove 

the most of the 1st and 2nd moments of the non-flatness, so that the last 

shifting angle correction will become not much important anymore in most 

of the cases… 

Best regards, ShinIchi

2023/04/19 22:02、Feng, Yicheng via Star-fcv-l <star-fcv-l AT lists.bnl.gov>のメール:

Hi All,

Please find our slides through the link below:

https://drupal.star.bnl.gov/STAR/system/files/Zdc20230418.pdf

Sincerely,

Yicheng

---

From: Star-fcv-l <star-fcv-l-bounces AT lists.bnl.gov> on behalf of Feng, Yicheng via Star-fcv-l <star-fcv-l AT lists.bnl.gov>
Sent: Tuesday, April 18, 2023 4:54 PM
To: subhash <subhash AT rcf.rhic.bnl.gov>; STAR Flow, Chirality and Vorticity PWG <star-fcv-l AT lists.bnl.gov>; Cameron Racz <cracz001 AT ucr.edu>
Subject: Re: [Star-fcv-l] FCV PWG meeting on 19/April/2023 Wed. 9:30 AM EDT

 

---- External Email: Use caution with attachments, links, or sharing data ----

Hi FCV convenors,

I'd like to present some slides for ZDCSMD calibration and Psi1 reconstruction.

I will send the slides to this list later.

Sincerely,

Yicheng

---

From: Star-fcv-l <star-fcv-l-bounces AT lists.bnl.gov> on behalf of Cameron Racz via Star-fcv-l <star-fcv-l AT lists.bnl.gov>
Sent: Tuesday, April 18, 2023 9:35 AM
To: subhash <subhash AT rcf.rhic.bnl.gov>; STAR Flow, Chirality and Vorticity PWG <star-fcv-l AT lists.bnl.gov>
Subject: Re: [Star-fcv-l] FCV PWG meeting on 19/April/2023 Wed. 9:30 AM EDT

 

---- External Email: Use caution with attachments, links, or sharing data ----

Hi Subhash,

I would like to make a presentation on Reaction plane correlated triangular flow at 3.2 GeV and I will send the slides later.

Thank you,

Cameron Racz

Ph.D. Candidate 

Heavy-ion Physics Group

University of California, Riverside

On Apr 17, 2023, at 4:55 AM, subhash via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:

Dear All,

We shall have our weekly FCV PWG meeting this Wednesday (19/April/2023) at 9:30 AM EDT. If you would like to present please let us know. Please try posting your slides by Tuesday. The agenda will be collected at: https://drupal.star.bnl.gov/STAR/blog/jjiastar/bulkcorr

Zoom details are copied below.

Thanks and regards,
Prithwish, Zhenyu and Subhash


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