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star-fcv-l - Re: [Star-fcv-l] FCV PWG meeting on 20/Sept/2023 Wed. 9:30 AM EDT

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Re: [Star-fcv-l] FCV PWG meeting on 20/Sept/2023 Wed. 9:30 AM EDT

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  • From: tc88qy <tc88qy AT rcf.rhic.bnl.gov>
  • To: Sooraj Radhakrishnan <skradhakrishnan AT lbl.gov>
  • Cc: "STAR Flow, Chirality and Vorticity PWG" <star-fcv-l AT lists.bnl.gov>, subhash <subhash AT rcf.rhic.bnl.gov>
  • Subject: Re: [Star-fcv-l] FCV PWG meeting on 20/Sept/2023 Wed. 9:30 AM EDT
  • Date: Sat, 23 Sep 2023 10:10:22 +0800
Hello Sooraj,

For the pT dependence, I don't have an answer yet.
But for the centrality bins, as I shown in the slides it has consistent result(same page).
As you mentioned, J/psi has a huge acceptance effect, and this acceptance effect will affect pT dependence more than the centrality dependence due to kinetic acceptance. We agree to not show the pT dependence in the SPIN2023. But in any way, we can revisit this after the conference if you want.

Qian Yang

On 2023-09-23 02:36, Sooraj Radhakrishnan wrote:
Unlike for the phi, you have a huge acceptance effect for J/Psi. So
the signal extraction systematics can be quite significant here

On Fri, Sep 22, 2023 at 11:18 AM Sooraj Radhakrishnan
<skradhakrishnan AT lbl.gov> wrote:

Hi Qian,
Thanks for following up on the questions from the PWG meeting. On
your S3 here, for your sum in pT case, do you have one with the same
pT range as the integral results? 0.3 - 6.0 GeV/c? Want to know how
much is the discrepancy from summing up the bins. If this is, as you
said, from some uncorrected bias when the statistics is low, could
this be a missing systematic in your yield extraction? What
systematic uncertainties do you take into account in yield
extraction and how are they propagated to rho_00?

Sooraj

On Thu, Sep 21, 2023 at 6:49 PM subhash via Star-fcv-l
<star-fcv-l AT lists.bnl.gov> wrote:

Thanks Qian for clarification. This one looks fine.

On 2023-09-22 06:53 AM, tc88qy wrote:
Hi Subhash

That plots may be misleading. In side 15, the rho_00 has also be
corrected for event-plane resolution.
I update a plot with both rho_00^obs and rho_00 in this link.
Please
check.


https://drupal.star.bnl.gov/STAR/system/files/Cent_0_80_pT_3_60.gif

Qian Yang

On 2023-09-21 23:12, subhash wrote:
Dear Qian,

Can you point me to an example of such case. In your slides
rho_00^obs
and resolution corrected seems the same ie is 0.2736 ± 0.01524
for
0-80%.
I am looking here side 15 (left figure) and 16 (blue data
point):



https://drupal.star.bnl.gov/STAR/system/files/jpsiSpinAlignment_20230914.pdf

Thanks and regards,
Subhash

On 2023-09-21 10:31 PM, tc88qy wrote:
Hello Subhash,

Yes, the event plane resolution correction has been propagated
to
both
the central value of rho_00 and its errors.
The rho_00 shown in the slides are already corrected for
event-plane
resolution.
If it is rho_00^{obs} value in plots, I will write it as
rho_00^{obs}.


Qian Yang

On 2023-09-21 20:11, subhash wrote:
Dear Qian,

Thanks for your response. I have one more comment that I
think I
missed during yesterday's discussion. Do you propagate errors
on
rho_00 when you apply event plane resolution correction. The
resolution correction will amplify the deviation from 1/3,
but will
also enlarge your statistical error bar. Looking at the
values of
rho_00^obs and rho_00^resol-corrected in figures, it seems to
me
that
error propagation is not considered. Am I correct, can you
please
confirm?

Thanks and regards,
Subhash

On 2023-09-21 06:09 PM, tc88qy wrote:
Hi Subhash
Please find my reply inline.
Regards,
Qian Yang
On 2023-09-21 17:56, subhash wrote:
Dear Qian,

Thanks for this study. I have a few follow up comments:

1. My understanding is "directly from data(Red)" is over a
wider
pt-range and "sum over (Magenta)" is statistical weighted
average
from
rho_00 vs pt, right? If the low and high pt range is same
for red
and
magenta points, eg 0.3 - 6 GeV/c, then I am fine with
either
red/magenta points to be shown.
Right, the red data came from a wider pt-range, and sum over
is
statistical weighted average from rho_00 vs pt.
It is the same pT range of 0.3-6 GeV/c for both case.

2. On your event plane, do you have any weighting factor in
reconstructing Q-vectors, e.g. a pt weight.
Yes, there is a pt weight

3. BTW, in your analysis do you have any opening angle
selection?
Why
I am asking is that we have seen such a cut can
artificially
enhance
the signal and one has to be careful in simulation when
correcting
for
such effect.
We did not apply any opening angle selection in the
analysis.

Thanks and regards,
Subhash

On 2023-09-21 02:46 PM, tc88qy via Star-fcv-l wrote:
Hello All,
I did some study in terms of the comments I got from
yesterdays
fav
pwg meeting. Two things are request to be check.
One is the rho_00 consistence check of summing over rho_00
in
pT/centrality vs the rho_00 extracted directly from data.
The conclusion is that the centrality dependence is safe.
By
summing
over in centrality, it gives a consistent results. But
summing
over pT
do give some discrepancy which mainly due to 0.3-6 and 3-4
GeV/c
range. For p_{T} dependence we may need some more to study
after
SPIN2023.
The other one is the event plane resolution. In the slides
I
mentioned
|eta|< 0.5, but actually I use |eta|<1 in the analysis.
I listed my cuts and event plane resolution, Subhash’s
result as
well
as STAR blind analysis's result in the slides. It is more
or less
consistent with each other.

Please look more details in this link.



https://drupal.star.bnl.gov/STAR/system/files/jpsiSpinAlignment_20230920.pdf

Qian Yang

On 2023-09-18 21:40, tc88qy via Star-fcv-l wrote:
Hello Subhash and all

I want to give an update on J/psi spin alignment study
in
isobar
data. This update has been shown in last week's HP-PWG
meeting.
Please
find slides in this link:



https://drupal.star.bnl.gov/STAR/system/files/jpsiSpinAlignment_20230914.pdf
I also got some comments from HP meeting. I did some
study
and
prepared few slides after HP-PWG meeting, you can find it
in
this
link:



https://drupal.star.bnl.gov/STAR/system/files/jpsiSpinAlignment_20230917.pdf
If it is all ok, I want request preliminary for this
study
for the
coming SPIN2023 meeting which is next week.
The preliminary request has been sent to HP mail list.
You
can find
the slides in this link:




https://drupal.star.bnl.gov/STAR/system/files/Preliminary_figures_request_1.pdf

Qian Yang

On 2023-09-18 18:26, subhash via Star-fcv-l wrote:
Dear All,

We shall have our weekly FCV PWG meeting this Wednesday
(20/Sept/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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--

Sooraj Radhakrishnan

Research Scientist,
Department of Physics

Kent State University
Kent, OH 44243

Physicist Postdoctoral AffiliateNuclear Science Division
Lawrence Berkeley National Lab
MS70R0319, One Cyclotron Road
Berkeley, CA 94720
Ph: 510-495-2473 [3]

Email: skradhakrishnan AT lbl.gov

--

Sooraj Radhakrishnan

Research Scientist,
Department of Physics

Kent State University
Kent, OH 44243

Physicist Postdoctoral AffiliateNuclear Science Division
Lawrence Berkeley National Lab
MS70R0319, One Cyclotron Road
Berkeley, CA 94720
Ph: 510-495-2473 [3]

Email: skradhakrishnan AT lbl.gov


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