STAR Flow, Chirality and Vorticity PWG

[xibaoshan AT fudan.edu.cn]

Hi Fuqiang,

Regarding your question on systematic error in phi analysis, we believe that the errors related to the fitting procedure and other systematic sources aren't entirely independent of each other. For instance, the dca cut has the potential to alter the background shape, thereby impacting the fitting procedure and overall selection criteria. To comprehensively account for the full range of potential values, we conducted a scan of each systematic error category employing various fitting procedures. It's worth noting that if one were to decouple the errors related to fitting from other sources, the total systematic error would be smaller. Our approach is a conservative measure.

Regarding your point about spin alignment and its relationship to the participant plane, we are not sure. The spin alignment t induced by vorticity should theoretically be more sensitive to spectator nucleons due to the initial torque generated by their rotation. Similarly, the magnetic field-induced global spin alignment also has ties to spectator nucleons.

In response to your comment about our current CME fraction at 200 GeV, the reasoning is straightforward. A rho_00 value is less than 1/3 contributes negatively to delta gamma. If we were to devise a method to eliminate this non-CME contribution, the resulting delta-gamma, post removal, would exceed the apparent value.

Best,

Baoshan

-----原始邮件-----
发件人: "Wang, Fuqiang via Star-fcv-l" <star-fcv-l AT lists.bnl.gov>
发送时间: 2023-08-30 01:11:30 (星期三)
收件人: "STAR Flow, Chirality and Vorticity PWG" <star-fcv-l AT lists.bnl.gov>
抄送: "Wang, Fuqiang" <fqwang AT purdue.edu>
主题: Re: [Star-fcv-l] STAR presentation by Baoshan Xi for Quark Matter 2023 submitted for review

Hi Baoshan,

On your backup slide 28, the procedure of syst. uncertainty estimation is described.  But it's not clear to me whether the min-max ranges are faithfully assessed. 

From an earlier communication with Gavin, https://lists.bnl.gov/pipermail/star-fcv-l/Week-of-Mon-20230821/004005.html, it turns out that multiple cuts were being varied simultaneously to obtain the min-max ranges, following the procedure in the Nature publication. 

This is rather a peculiar way to estimate syst. uncertainties, and I'm not sure what it entails. 

To the very least, this should be fully discussed with details, e.g., with values of syst. variations in the results, to assess whether the min-max ranges are faithfully assessed for each syst. source variation. 

On your conclusion slide, you state "complicates CME analyses that rely on ratios (Ru/Zr, PP/SP)." As far as I understand, any possible rho spin alignment is related to the participant plane because it arises from spin-orbital interactions within the participant zone, and therefore it is part of the flow-induced background and already taken care of in Ru/Zr and PP/SP analyses. So it is unclear what your conclusion means. Can you elaborate more on this point in the talk so you can make such a conclusion?

You also have a summary statement "This means that our current CME fraction at 200 GeV is under stated." If my understanding above is correct, then I don't think your talk supports such a statement. Again it would be helpful if more discussions are given in the talk in this regard. 

Best regards,

Fuqiang

---

From: Star-fcv-l <star-fcv-l-bounces AT lists.bnl.gov> on behalf of Baoshan Xi via Star-fcv-l <star-fcv-l AT lists.bnl.gov>
Sent: Monday, August 28, 2023 5:04 AM
To: subhash <subhash AT rcf.rhic.bnl.gov>
Cc: xibaoshan AT fudan.edu.cn <xibaoshan AT fudan.edu.cn>; STAR Flow, Chirality and Vorticity PWG <star-fcv-l AT lists.bnl.gov>
Subject: Re: [Star-fcv-l] STAR presentation by Baoshan Xi for Quark Matter 2023 submitted for review

 

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


Dear Subhash and all,

Sorry for the mistake.
I have updated the files for both websites.

Best,
Baoshan


> -----原始邮件-----
> 发件人: subhash <subhash AT rcf.rhic.bnl.gov>
> 发送时间:2023-08-28 16:05:36 (星期一)
> 收件人: "STAR Flow, Chirality and Vorticity PWG" <star-fcv-l AT lists.bnl.gov>
> 抄送: xibaoshan AT fudan.edu.cn
> 主题: Re: [Star-fcv-l] STAR presentation by Baoshan Xi for Quark Matter 2023 submitted for review
>
> Dear Baoshan,
>
> Could you please upload your latest/correct talk at this link?
> https://nam04.safelinks.protection.outlook.com/?url="https%3A%2F%2Fdrupal.star.bnl.gov%2FSTAR%2Fnode%2F64789&data=05%7C01%7Cfqwang%40purdue.edu%7C89c66b4657894580352208dba7a5ecf1%7C4130bd397c53419cb1e58758d6d63f21%7C0%7C0%7C638288103403826311%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=JQvtU0WbXbQ2k7XUMCUbwBqtcdoLvkTLogCoSQg6xTw%3D&reserved=0
> Currently, it has 58 slides, I don't think it is the intended slide
> version.
>
>
> The following link correspond to QM abstract that was submitted.
> https://nam04.safelinks.protection.outlook.com/?url="https%3A%2F%2Fdrupal.star.bnl.gov%2FSTAR%2Fpresentations%2FQuark-Matter-2023%2FNew-Insights-Global-Spin-Alignment-Heavy-Ion-Collisions-Measurements&data=05%7C01%7Cfqwang%40purdue.edu%7C89c66b4657894580352208dba7a5ecf1%7C4130bd397c53419cb1e58758d6d63f21%7C0%7C0%7C638288103403826311%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=3mg0THXXF5L6gd1epZSn8ty6EnfhjT8Fxw5EcIi8xQY%3D&reserved=0
> It should contain QM abstract that is submitted.
>
> Thanks and regards,,
> Subhash
>
>
> On 2023-08-23 09:23 PM, Baoshan Xi via Star-fcv-l wrote:
> > Dear conveners and all,
> >
> > I have made some updates to the slides.
> >
> > Please kindly find the updated report by the link:
> >
> > https://nam04.safelinks.protection.outlook.com/?url="https%3A%2F%2Fdrupal.star.bnl.gov%2FSTAR%2Fpresentations%2FQuark-Matter-2023%2FNew-Insights-Global-Spin-Alignment-Heavy-Ion-Collisions-Measurements&data=05%7C01%7Cfqwang%40purdue.edu%7C89c66b4657894580352208dba7a5ecf1%7C4130bd397c53419cb1e58758d6d63f21%7C0%7C0%7C638288103403826311%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=3mg0THXXF5L6gd1epZSn8ty6EnfhjT8Fxw5EcIi8xQY%3D&reserved=0
> >
> > Best,
> > Baoshan
> >
> >
> >
> >
> >> -----原始邮件-----
> >> 发件人: "webmaster--- via Star-fcv-l" <star-fcv-l AT lists.bnl.gov>
> >> 发送时间:2023-08-21 20:55:52 (星期一)
> >> 收件人: star-fcv-l AT lists.bnl.gov
> >> 抄送: webmaster AT star.bnl.gov
> >> 主题: [Star-fcv-l] STAR presentation by Baoshan Xi for Quark Matter 2023
> >> submitted for review
> >>
> >> Dear star-fcv-l AT lists.bnl.gov members,
> >>
> >> Baoshan Xi (xibaoshan AT fudan.edu.cn) has submitted a material for a
> >> review,
> >> please have a look:
> >> https://nam04.safelinks.protection.outlook.com/?url="https%3A%2F%2Fdrupal.star.bnl.gov%2FSTAR%2Fnode%2F64789&data=05%7C01%7Cfqwang%40purdue.edu%7C89c66b4657894580352208dba7a5ecf1%7C4130bd397c53419cb1e58758d6d63f21%7C0%7C0%7C638288103403826311%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=JQvtU0WbXbQ2k7XUMCUbwBqtcdoLvkTLogCoSQg6xTw%3D&reserved=0
> >>
> >> Deadline: 2023-09-03
> >> ---
> >> If you have any problems with the review process, please contact
> >> webmaster@https://nam04.safelinks.protection.outlook.com/?url="http%3A%2F%2Fwww.star.bnl.gov%2F&data=05%7C01%7Cfqwang%40purdue.edu%7C89c66b4657894580352208dba7a5ecf1%7C4130bd397c53419cb1e58758d6d63f21%7C0%7C0%7C638288103403826311%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=tyH2NlEWZnzy%2FV0IBSgXCqOd76GDfvik2PLSwGaOw3I%3D&reserved=0
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