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[Star-fcv-l] slides of SHE study

From: 胡强 <qianghu AT impcas.ac.cn>
To: star-fcv-l AT lists.bnl.gov
Subject: [Star-fcv-l] slides of SHE study
Date: Wed, 22 Feb 2023 18:10:35 +0800 (GMT+08:00)

Dear All,

Please find the slides of SHE study.

https://drupal.star.bnl.gov/STAR/node/add/blog

Best regards,

Qiang

> -----原始邮件-----
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> 发送时间: 2023-02-22 07:29:16 (星期三)
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> 主题: Star-fcv-l Digest, Vol 30, Issue 35
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> 1. Re: FCV PWG meeting on 18/January/2023 Wed. 9:30 AM EDT
> (Richard Seto)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 21 Feb 2023 15:28:56 -0800
> From: Richard Seto <seto AT ucr.edu>
> To: "Adams, Joseph R." <adams.1940 AT osu.edu>, "STAR Flow, Chirality and
> Vorticity PWG" <star-fcv-l AT lists.bnl.gov>
> Subject: Re: [Star-fcv-l] FCV PWG meeting on 18/January/2023 Wed. 9:30
> AM EDT
> Message-ID: <e6512d6d-42f1-4eb5-abb8-c8dc3ca672be AT ucr.edu>
> Content-Type: text/plain; charset="utf-8"
>
> Hi
> The paper reference is wrong. This is the one I meant. It is from Joey?s
slides.
>
https://urldefense.com/v3/__https://arxiv.org/pdf/nucl-th/0202013.pdf__;!!P4SdNyxKAPE!HKW_cDiutsC7fqIfc9v4Aflcjw15RzeI6mlSuhF7NXtO4Xf6FmtWe6J9fp9TVmClQQWq92HIbotwhxqeSw9n$
?
> 0202013
> PDF Document ? 258 KB
>
>
> > On Feb 21, 2023, at 3:19 PM, Richard Seto <seto AT ucr.edu> wrote:
> >
> > Hi Joey
> > I have a few naive questions about this. In particular I am looking
at what you did and the paper
https://urldefense.com/v3/__https://arxiv.org/abs/hep-ex/0207026__;!!P4SdNyxKAPE!HKW_cDiutsC7fqIfc9v4Aflcjw15RzeI6mlSuhF7NXtO4Xf6FmtWe6J9fp9TVmClQQWq92HIbotwhx1B63H6$
<https: urldefense.com="" v3="" __https:="" arxiv.org="" abs="" hep-ex=""
0207026__;!!p4sdnyxkape!gfvrgb_oal0xivyw-wyt8mhcdrftx3ist2go5k0y16dfl_dk8hot7jzkoc9hmxbd1ozn7ib_bxld7a72ex4y8rzt24gv$="">
that you mention.
> > 1) The paper in section IVA (or B) gives a prescription to deal
with momentum conservation by altering the Q vector. You did not seem to do
this. You narrowed the regions from which you calculated the event planes -
is that true?
> > If so - why didn?t you use the method given in the paper?
> > 2) My understanding is the they are suggesting that the Q vector be
altered by adding a term pT (a vector). Do you know what this means? I am
presuming it is a vector (Sum over all particles of px, Sum over all
particles of py)
> > Is that right?
> > 3) This does not alter the way v1 itself is extracted, right?
v1=<cos(phi-psi)>. It is just that Psi is now changed. (?)
> > 4) you said that systematic errors were discussed here. Can you
point me to the section.
> > 5) the example he gives seems to use the method in section B. Do
you have any clue as to why he chose to do that?
> > Thanks
> > -Rich
> >
> >
> >
> >> On Jan 18, 2023, at 8:08 AM, Adams, Joseph R. via Star-fcv-l
<star-fcv-l AT lists.bnl.gov> wrote:
> >>
> >> Hi all,
> >>
> >> Please refer to my FCV presentation from 2021 regarding today's
discussion on momentum-conservation effects which can affect strongly
measurements of event-plane resolution at low energy/fixed target, where
multiplicity is particularly low:
https://drupal.star.bnl.gov/STAR/system/files/2021-03-31_PolarizationAt3GeV_v2.pdf
> >>
> >> Keep in mind that we use the three-subevent method for
measuring resolution
(https://urldefense.com/v3/__https://arxiv.org/abs/nucl-ex/9805001__;!!P4SdNyxKAPE!HKW_cDiutsC7fqIfc9v4Aflcjw15RzeI6mlSuhF7NXtO4Xf6FmtWe6J9fp9TVmClQQWq92HIbotwh8ChwfSe$
<https: urldefense.com="" v3="" __https:="" arxiv.org="" abs="" nucl-ex=""
9805001__;!!p4sdnyxkape!gfvrgb_oal0xivyw-wyt8mhcdrftx3ist2go5k0y16dfl_dk8hot7jzkoc9hmxbd1ozn7ib_bxld7a72ex4y8sstey-q$="">)
in fixed-target mode, since the collision system is not symmetric. We have
the "main" subevent which is used to measure the Psi_1 that will be used in
the measurement of the observable, and two "reference" subevents from which
we measure Psi_1 and compare to the Psi_1 from the main subevent in order to
measure the resolution of the main subevent. This resolution on the main
subevent is used as a correction on the observable which makes correlations
with Psi_1 from the main subevent.
> >>
> >> Importantly, the resolution of the main subevent should
definitely NOT depend on your choice of subevents; however, it can be
artificially modified by non-flow effects. In particular, momentum
conservation will artificially enhance the resolution.
> >>
> >> In my slides from the link above, I was initially searching for
systematic mistakes (systematic effects that weren't accounted for) and found
that the polarization observable depended on EPD ring (slide 12), which
seemed wrong. I have encouraged those performing fixed-target analyses to
also check the dependence of their observable on EPD ring. Realizing other
strange behavior in the smaller rings, and also that those rings were
substantially farther-forward in rapidity than the beam rapidity, I decided
to use only the outer EPD rings (13-16, inclusive). This restriction in eta
helps remove momentum-conservation contributions to the subevent's
resolution. Importantly, there is no observable dependence of polarization on
subevent size within rings 13-16 (i.e. when using only ring 13, rings
13&14, rings 13-15, and rings 13-16).
> >>
> >> Now, being satisfied with the main subevent, one must choose
reference subevents. Again, any dependence of the main subevent's resolution
on reference subevent choice suggests problems. On slide 16, you can see the
resolution as a function of reference subevents of eta width 0.1 in the TPC.
In the lower left, we are choosing subevents that are close in eta to the
EPD, so unsurprisingly, we see artificial enhancement. Instead, we want to
see the resolution reach a stable point, which we see farther from the EPD.
At that point, the choice of reference subevents is arbitrary. For those
reference subevents, we reduced their size and saw no significant change in
resolution, meaning we are sufficiently free of momentum-conservation effects
and other non-flow effects.
> >>
> >> At this point, we have selected a main subevent and two
reference subevents that show no observable non-flow effects and therefore
offer an accurate representation of Psi_1 and its resolution. Again, the
resolution is a correction; the uncertainty on that correction (which is
simply the statistical uncertainties) is that correction's contribution to
the total systemic uncertainty. Read
https://urldefense.com/v3/__https://arxiv.org/abs/hep-ex/0207026__;!!P4SdNyxKAPE!HKW_cDiutsC7fqIfc9v4Aflcjw15RzeI6mlSuhF7NXtO4Xf6FmtWe6J9fp9TVmClQQWq92HIbotwhx1B63H6$
<https: urldefense.com="" v3="" __https:="" arxiv.org="" abs="" hep-ex=""
0207026__;!!p4sdnyxkape!gfvrgb_oal0xivyw-wyt8mhcdrftx3ist2go5k0y16dfl_dk8hot7jzkoc9hmxbd1ozn7ib_bxld7a72ex4y8rzt24gv$="">
for more details on systematic uncertainties.
> >>
> >> Please let me know if you have any questions, and feel free to
offer corrections or clarifications.
> >>
> >> Best,
> >>
> >> Joey
> >> From: Star-fcv-l <star-fcv-l-bounces AT lists.bnl.gov
<mailto:star-fcv-l-bounces AT lists.bnl.gov="";>> on behalf of subhash via
Star-fcv-l <star-fcv-l AT lists.bnl.gov <mailto:star-fcv-l AT lists.bnl.gov="";>>
> >> Sent: Monday, January 16, 2023 7:08 AM
> >> To: STAR Flow, Chirality and Vorticity PWG
<star-fcv-l AT lists.bnl.gov <mailto:star-fcv-l AT lists.bnl.gov="";>>
> >> Subject: [Star-fcv-l] FCV PWG meeting on 18/January/2023 Wed.
9:30 AM EDT
> >>
> >>
> >>
> >> Dear All,
> >>
> >> We shall have our weekly FCV PWG meeting this Wednesday
> >> (18/January/2023) at 9:30 AM EDT. If you would like to present
please
> >> let us know. Please try posting your slides by Tuesday. The
agenda will
> >> be collected at:
https://urldefense.com/v3/__https://drupal.star.bnl.gov/STAR/blog/jjiastar/bulkcorr__;!!KGKeukY!y6Kc06ZAp8I7TBzKNFTSiUHvE2zhEidLU76XXRMZkP6mSFQw5fQoszPOXZF7kwDlxVlY5lwRgIYw4N5ReJByhb_VbS31Vg$

> >>
> >> Zoom details are copied below.
> >>
> >> Thanks and regards,
> >> Prithwish, Zhenyu and Subhash
> >>
> >>
> >> ZOOM LINK FOR FCV MEETING:
> >> Join ZoomGov Meeting
> >>
https://urldefense.com/v3/__https://bnl.zoomgov.com/j/1612377416?pwd=V3kvcnN5ZTRLVEc4U01QWUUycDQ1UT09__;!!KGKeukY!y6Kc06ZAp8I7TBzKNFTSiUHvE2zhEidLU76XXRMZkP6mSFQw5fQoszPOXZF7kwDlxVlY5lwRgIYw4N5ReJByhb_rp1lFZA$

> >>
> >> Meeting ID: 161 237 7416
> >> Passcode: 106847
> >>
> >> One tap mobile
> >> +16692545252,,1612377416#,,,,*106847# US (San Jose)
> >> +16468287666,,1612377416#,,,,*106847# US (New York)
> >>
> >> Dial by your location
> >> +1 669 254 5252 US (San Jose)
> >> +1 646 828 7666 US (New York)
> >> +1 551 285 1373 US
> >> +1 669 216 1590 US (San Jose)
> >> Meeting ID: 161 237 7416
> >> Passcode: 106847
> >> Find your local number:
https://urldefense.com/v3/__https://bnl.zoomgov.com/u/abVqdu5fbU__;!!KGKeukY!y6Kc06ZAp8I7TBzKNFTSiUHvE2zhEidLU76XXRMZkP6mSFQw5fQoszPOXZF7kwDlxVlY5lwRgIYw4N5ReJByhb89xAa_xQ$

> >>
> >> Join by SIP
> >> 1612377416 AT sip.zoomgov.com <mailto:1612377416 AT sip.zoomgov.com>
> >>
> >> Join by H.323
> >> 161.199.138.10 (US West)
> >> 161.199.136.10 (US East)
> >> Meeting ID: 161 237 7416
> >> Passcode: 106847
> >> _______________________________________________
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> >> Star-fcv-l AT lists.bnl.gov <mailto:star-fcv-l AT lists.bnl.gov>
> >>
https://urldefense.com/v3/__https://lists.bnl.gov/mailman/listinfo/star-fcv-l__;!!KGKeukY!y6Kc06ZAp8I7TBzKNFTSiUHvE2zhEidLU76XXRMZkP6mSFQw5fQoszPOXZF7kwDlxVlY5lwRgIYw4N5ReJByhb-w5n1E7Q$

> >> _______________________________________________
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</https:></https:></mailto:star-fcv-l AT lists.bnl.gov></mailto:star-fcv-l AT lists.bnl.gov></mailto:1612377416 AT sip.zoomgov.com></star-fcv-l AT lists.bnl.gov></star-fcv-l AT lists.bnl.gov></star-fcv-l-bounces AT lists.bnl.gov></https:></https:></star-fcv-l AT lists.bnl.gov></cos(phi-psi)></https:></seto AT ucr.edu></e6512d6d-42f1-4eb5-abb8-c8dc3ca672be AT ucr.edu></star-fcv-l AT lists.bnl.gov></adams.1940 AT osu.edu></seto AT ucr.edu>

[Star-fcv-l] slides of SHE study, 胡强, 02/22/2023