STAR Flow, Chirality and Vorticity PWG

["Robertson, Charles William" <rober558 AT purdue.edu>]

 Hello Huan,

 Thanks for the question, hope these responses help! Please see below.

  -CW

  On slide 7 what do you refer to when you discuss autocorrelation? What exactly is the autocorrelation that you are concerned with here? [On slide 7, the green data is from averaging the Delta S from the East and West subevents. This is how the R variable is defined. We say the green data contains an “autocorrelation” because by averaging the Delta S East and Delta S West the POI & EP are no longer independent. The same degrees of freedom have been used twice - since the EP is used in calculating Delta S (slide 4). The red data are what we see if the two Delta S are NOT averaged.] – CW

  On slide 9, you showed a relation between v2 and q2. We saw the similar relationship in Zhiwan/Gang’s analysis. For centrality bin of 20-50%, the averaged v2 is within a small range as shown in your figure. In our attempt to do Event-Shape Selection, we try to select a small class of events fluctuated towards more spherical shape (small q2).  What we find is that the fluctuations of q2 in different eta windows or different subset of particles are not correlated at all. Because of this semi-independent fluctuations, one cannot use the so-defined q2 as a dial to select spherical events for particles of interest. Essentially, one tries to use an ineffective dial to select the event shape.

  Why are these fluctuations in q2 from different eta windows so independent? There may be deep dynamical reasons that we do not know yet.

  It may be useful for STAR to evaluate the different Event-Shape Selection approaches. We should make sure that different approaches should be clearly explained if seemingly different results will be presented.  

[ Our v2 come from the East subevent eta range -1.0 < eta < -0.3 and West subevent eta range: 0.3 < eta < 1.0. Our q2 is taken from a middle eta region -0.3 < eta < 0.3. So, the q2 and v2 come from separate phase spaces, so the fluctuations of v2 vs. q2 should be dynamical. ] --CW

---

From: Huan Zhong Huang <huang AT physics.ucla.edu>
Sent: Wednesday, October 5, 2022 4:02 PM
To: Robertson, Charles William <rober558 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 05/October/2022 Wed. 9:30 AM EDT

 

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

Hi CW,

  On slide 7 what do you refer to when you discuss autocorrelation? What exactly is the autocorrelation that you are concerned with here?

  On slide 9, you showed a relation between v2 and q2. We saw the similar relationship in Zhiwan/Gang’s analysis. For centrality bin of 20-50%, the averaged v2 is within a small range as shown in your figure. In our attempt to do Event-Shape Selection, we try to select a small class of events fluctuated towards more spherical shape (small q2).  What we find is that the fluctuations of q2 in different eta windows or different subset of particles are not correlated at all. Because of this semi-independent fluctuations, one cannot use the so-defined q2 as a dial to select spherical events for particles of interest. Essentially, one tries to use an ineffective dial to select the event shape.

  Why are these fluctuations in q2 from different eta windows so independent? There may be deep dynamical reasons that we do not know yet.

  It may be useful for STAR to evaluate the different Event-Shape Selection approaches. We should make sure that different approaches should be clearly explained if seemingly different results will be presented.  

  Thanks. Regards,

  Huan

 

From: Star-fcv-l [mailto:star-fcv-l-bounces AT lists.bnl.gov] On Behalf Of Robertson, Charles William via Star-fcv-l
Sent: Wednesday, October 5, 2022 10:21 AM
To: STAR Flow, Chirality and Vorticity PWG <star-fcv-l AT lists.bnl.gov>
Subject: Re: [Star-fcv-l] FCV PWG meeting on 05/October/2022 Wed. 9:30 AM EDT

 

Hello Conveners,

 

I have updated my slides to include a copy of the 

\xi vs. N*Dgamma plot which includes the separate DeltaS, single normalization data series (pink points). 

 

Please see Slide 12.

 https://drupal.star.bnl.gov/STAR/system/files/Dnp_3.pdf

 

Thanks!

-CW

---

From: Star-fcv-l <star-fcv-l-bounces AT lists.bnl.gov> on behalf of Zhiwan Xu via Star-fcv-l <star-fcv-l AT lists.bnl.gov>
Sent: Tuesday, October 4, 2022 2:27 PM
To: Zhiwan Xu <zhiwanxu AT physics.ucla.edu>; STAR Flow, Chirality and Vorticity PWG <star-fcv-l AT lists.bnl.gov>
Subject: Re: [Star-fcv-l] FCV PWG meeting on 05/October/2022 Wed. 9:30 AM EDT

 

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


Dear conveners,
 Please find my slide here: https://drupal.star.bnl.gov/STAR/blog/zhiwanxu/Preliminary-Request-DNP-2022

Best,
Zhiwan

----- Original Message -----
From: "Zhiwan Xu via Star-fcv-l" <star-fcv-l AT lists.bnl.gov>
To: "subhash" <subhash AT rcf.rhic.bnl.gov>, "STAR Flow, Chirality and Vorticity PWG" <star-fcv-l AT lists.bnl.gov>
Sent: Monday, October 3, 2022 5:20:56 PM
Subject: Re: [Star-fcv-l] FCV PWG meeting on 05/October/2022 Wed. 9:30 AM EDT

Dear conveners,
 I would like to give a presentation on preliminary request of Event Shape Selection study on CME in Au+Au at 27 and 19.6 GeV. Please kindly add me to the agenda. Thank you.
Best,
Zhiwan

----- Original Message -----
From: "subhash via Star-fcv-l" <star-fcv-l AT lists.bnl.gov>
To: "STAR Flow, Chirality and Vorticity PWG" <star-fcv-l AT lists.bnl.gov>
Sent: Monday, October 3, 2022 6:51:15 AM
Subject: [Star-fcv-l] FCV PWG meeting on 05/October/2022 Wed. 9:30 AM EDT

Dear All,

We shall have our weekly FCV PWG meeting this Wednesday
(05/October/2022) at 9:30 AM EDT. If you would like to present please
let us know. Please try posting your slides by Tuesday. The agenda items
will be collected at:
https://drupal.star.bnl.gov/STAR/blog/jjiastar/bulkcorr

Thanks and regards,
Jiangyong, Prithwish and Subhash


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