STAR Flow, Chirality and Vorticity PWG

[Jie Zhao <jiezhao1119 AT hotmail.com>]

Dear ShinIchi,

thanks for your nice comments and suggestions, certainly we will do all of the cross check as you suggested toward the publication, 

as you mentioned it’ may not have enough time to finished by SQM.

I have another question/suggestion, since you have confirmed there is no 

strong pT dependence of the mass and width of the f0 peak, did you also 

try to see if there is any centrality dependence of the mass/width with 

integrating wider pT bin? 

i have those numbers from difference centrality on the slide 10, looks like it’s similar, seems also no strong centrality dependence. 

https://www.star.bnl.gov/protected/lfsupc/jiezhao/SQM2021/slides/SQM2021_JieZhao.pdf

For your v2 extraction, you have assumed they are unchanged as a function 

of azimuthal angle, which is good to maximize the statistical significance 

of the v2 measurements, so I do agree in this direction, but I would also like 

to see the following two extreme cases; (a) no assumption on the azimuthal 

dependence, (b) constant assumption of mass/width over pT range as well 

for further constraint for possible improvement on v2 significance.

we did look at the results using free width/mass fit at very beginning, the errors slightly increased, we will check it again.

since you already do assume centrality and azimuthal independence, right?

we assume azimuthal independence, which likely is a good approximation, 

since we are not study the centrality dependence, we do not assume centrality independent or not.

Thanks and Best regards!

Jie

On May 12, 2021, at 9:59 PM, ShinIchi Esumi via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:

Dear Jie

Thank you for the quick feedback. If the blue curve (BG) largely depends 

on the normalization of like-sign subtraction, you can also show us the v2 of 

just the like-sign contribution around the f0 mass region after the normalization, 

or you can think of measuring v2 of "blue curve (correlated BG) + normalized 

like-sign BG”. Measuring the v2 of pink curve (rho) and of purple curve (f2) 

are interesting by its own, but the tail of these peaks as well as the above 

BG contributions would affect your measurement, therefore I would like to 

see these individual v2 contributions or sum v2 of all other contributions at f0 

mass region. Please keep in mind that you can just take the fitted amplitude 

of the mass peak to get v2, if you fix the shape of the mass distribution, 

or one would need to integrate the proper mass range to get azimuthal 

dependence of the yield for v2 extraction, as I think you already do. 

I have another question/suggestion, since you have confirmed there is no 

strong pT dependence of the mass and width of the f0 peak, did you also 

try to see if there is any centrality dependence of the mass/width with 

integrating wider pT bin? 

For your v2 extraction, you have assumed they are unchanged as a function 

of azimuthal angle, which is good to maximize the statistical significance 

of the v2 measurements, so I do agree in this direction, but I would also like 

to see the following two extreme cases; (a) no assumption on the azimuthal 

dependence, (b) constant assumption of mass/width over pT range as well 

for further constraint for possible improvement on v2 significance, since you 

already do assume centrality and azimuthal independence, right? 

What I’m writing here above might be too much for the preliminary in SQM, 

so you can consider them for the final publication.  Thank you very much 

again for the interesting analysis and results. 

Best regards, ShinIchi

On May 13, 2021, at 2:48, Jie Zhao <jiezhao1119 AT hotmail.com> wrote:

Dear ShinIchi,

thanks for your suggestions, certainly we can do it, but if you remember as we discussed during the previous analysis meting, 

the fit of the blue curve (BG) is largely depends on the normalization, the plot here are also already subtracted the combinatorial background using likesign distribution.

the v2 of this blue curve do provides useful information.

for the fit on the rho (pink curve), if we have better control on the rho mass, width, and the background, we will also report the rho v2.

but as you know, those informations on rho have very large uncertainty, and the background on left and right are very difference, it’s thus very difficult to get a reasonable v2 of rho, and this even true for f2.

the advantage of f0 is that the width is smaller compare to rho and f2, and the background is smooth dominated by the left rho and right f0 peak.

Thanks and Best regards!

Jie

and thus we study the Ks for a cross check as you suggested, thanks!

Thanks and Best regards!

Jie

On May 12, 2021, at 1:45 PM, Jie Zhao <jiezhao1119 AT hotmail.com> wrote:

Dear ShinIchi,

thanks for your suggestions, certainly we can do it, but if you remember as we discussed during the previous analysis meting, 

the fit of the blue curve (BG) is largely depends on the normalization, the plot here are also already subtracted the combinatorial background using likesign distribution.

the v2 of this blue curve do provides useful information.

for the fit on the rho (pink curve), if we have better control on the rho mass, width, and the background, we will also report the rho v2.

but as you know, those informations on rho have very large uncertainty, and the background on left and right are very difference, it’s thus very difficult to get a reasonable v2 of rho, and this even true for f2.

the advantage of f0 is that the width is smaller compare to rho and f2, and the background is smooth dominated by the left rho and right f0 peak.

Thanks and Best regards!

Jie

On May 12, 2021, at 12:34 PM, ShinIchi Esumi via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:

Dear Jie

What I meant about combinatorial v2 in your analysis, is about 

the v2 of pink curve (rho) and v2 of blue curve (BG?) and even for 

v2 of purple curve (f2) to be compared with your signal v2 of green 

curve (f0) signal, that can be extracted from your 5 different fitting 

panels (for 5 phi bins) in page 11, that you just need to calculate 

the right quantity using the fitted parameters for the exactly same 

centrality and pT selections. Or you might need to calculate v2 of 

all other contributions (sum of all pink+blue+purple). 

Best regards, ShinIchi

On May 12, 2021, at 13:44, Jie Zhao <jiezhao1119 AT hotmail.com> wrote:

Dear ShinIchi and All,

please find my slides for today’s meeting below, thanks!

https://www.star.bnl.gov/protected/lfsupc/jiezhao/SQM2021/slides/SQM2021_JieZhao.pdf

Thanks and Best regards!

Jie

On May 10, 2021, at 2:37 PM, Jie Zhao <jiezhao1119 AT hotmail.com> wrote:

Dear ShinIchi and All,

please also put me on the agenda, i would like to show few slides about the updates on the f0 v2 analysis for SQM, thanks!

Thanks and Best regards!

Jie

On May 10, 2021, at 11:58 AM, Prithwish Tribedy via Star-fcv-l <star-fcv-l AT lists.bnl.gov> wrote:

Hi ShinIchi,
  Can you please also put me on the agenda for a short update on   collectivity in photonuclear processes.
Best,
Prithwish


On 2021-05-10 06:38, ShinIchi Esumi via Star-fcv-l wrote:

Dear FCV PWG colleagues
We will have our usual weekly FCV PWG meeting on this Wednesday 12/May/2021
9:30AM in BNL (NY time zone) at our usual time and place. So if you
have anything to
present, please let us know and please post your slide by Tuesday. The
zoom room link,
ID and password are in our usual drupal agenda page below. Please also
keep in mind
that all the preliminary plots should have already been there in the
summary area below,
if it’s not there, please make one and remind us.
Best regards, Jiangyong, Prithwish and ShinIchi
Meeting agenda page with zoom link :
https://drupal.star.bnl.gov/STAR/blog/jjiastar/bulkcorr
Preliminary page :
https://drupal.star.bnl.gov/STAR/pwg/bulk-correlations/bulkcorr-preliminary-summary
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