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star-cf-l - Re: [Star-cf-l] CF PWG meeting, August 10th, 2023, time: 9:00 (BNL time)

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Subject: STAR Correlations and Fluctuations PWG

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Re: [Star-cf-l] CF PWG meeting, August 10th, 2023, time: 9:00 (BNL time)

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  • From: Hanna Paulina Zbroszczyk <hanna.zbroszczyk AT pw.edu.pl>
  • To: "star-cf-l AT lists.bnl.gov" <star-cf-l AT lists.bnl.gov>
  • Subject: Re: [Star-cf-l] CF PWG meeting, August 10th, 2023, time: 9:00 (BNL time)
  • Date: Mon, 21 Aug 2023 12:57:29 +0200
Hi Yu,

Many thanks for your responses.
As we see that more work is needed on the Barlow test, I suggest moving forward with results without the Barlow test being applied. We need to move forward for QM. I understand that you will work more on these results toward final publication.
At this moment, I sign off your results without Barlow test.

Please create an entry:

https://drupal.star.bnl.gov/STAR/blog/gos/correlations-and-fluctuations-preliminary-plots

Put your plot there.

Thanks,
Hanna

Hanna Paulina Zbroszczyk
PhD DSc Eng, Professor WUT

E-mail: hanna.zbroszczyk AT pw.edu.pl
Tel: +48 22 234 5851 (office)

Address:
Warsaw University of Technology
Faculty of Physics
Nuclear Physics Division
Koszykowa 75
Office: 117b (via 115)
00-662 Warsaw, Poland

Wiadomość napisana przez 曾钰 via Star-cf-l <star-cf-l AT lists.bnl.gov> w dniu 16.08.2023, o godz. 14:20:

Hi Hanna,
Very sorry, I just sent wrong link, this is the new link.

https://drupal.star.bnl.gov/STAR/system/files/pp_CF_3p2GeV_preliminary_v2_about_comment.pdf

Best regards
Yu Zeng
 
------------------ Original ------------------
From:  "曾钰 via Star-cf-l"<star-cf-l AT lists.bnl.gov>;
Date:  Wed, Aug 16, 2023 08:05 PM
To:  "star-cf-l"<star-cf-l AT lists.bnl.gov>;
Cc:  "曾钰"<zengy AT mails.ccnu.edu.cn>;
Subject:  Re: [Star-cf-l] CF PWG meeting, August 10th, 2023, time: 9:00 (BNL time)
 
Hi Hanna,

Thank you for your comments, and I prepared short slides to answer your question at here: https://drupal.star.bnl.gov/STAR/system/files/pp_CF_3p2GeV_preliminary_v2_about_comment.pdf
Best regards
Yu Zeng
 
 
------------------ Original ------------------
From:  "Hanna Paulina Zbroszczyk via Star-cf-l"<star-cf-l AT lists.bnl.gov>;
Date:  Sun, Aug 13, 2023 11:56 PM
To:  "star-cf-l"<star-cf-l AT lists.bnl.gov>;
Cc:  "Hanna&amp;nbsp;Paulina&amp;nbsp;"<hanna.zbroszczyk AT pw.edu.pl>;
Subject:  Re: [Star-cf-l] CF PWG meeting, August 10th, 2023, time: 9:00 (BNL time)
 
Hi Yu,

I went through your slides from the last PWG meeting. I am glad to see the progress of proton femtoscopy at 3.2 GeV.
I have a few questions regarding your presentation.

Slide 8:
How did you estimate the average single-particle purity as a function of momentum?
The negligible effect I guess, but still, it is worth performing it with good precision.
Is it a simple average over all momentum bins?
In the case of single particles, It should be estimated as a weighted average considering the number of protons you find for a given momentum. Having estimated weighted average purity (when you could include the exact measured number of protons for a given momentum), I expect your single-particle purity increases, and you will be closer to the unity. However, in case of purity correction, you apply for your correlation function, you should consider two-particle purity (instead of single-one), so Pur(k*)=Pur1(p1)*Pur2(p2). It would also be good to check how this changes regarding the number of pairs for a given k*.
However, if you decrease the momentum range to p = 1.4 GeV/c, your single-particle purity will be almost flat and close to the unity. Please consider this to make an estimation of your purity simpler.

Slide 11/12:
Track-splitting and its contribution to the correlation function should *not* be considered with Nhits cut but rather with the splitting level (SL) carefully checked. Most people remove track-splitting with the SL, and please follow these recommendations. With Nhits, you will not remove this effect from the correlation function (when two tracks are really close to each other). Please refer to the pion interferometry paper from 200 GeV published by STAR around 2005.


Slide 15:
Any impact of \delta \theta here? It is recommended to use \delta \phi* variable.

Slide 21:
When you consider momentum smearing, calculating the CF_smered from the model, when you put the value of smeared correlation function (for smeared k*), do you put a value of the correlation function for smeared k* or real k*? In other words, when you put: [k*smeared, CF], is this CF calculated for k* smeared or not? I

Slide 22:
How do resolution smearing, purity correction, splitting, and merging effects (not only \delta phi*) contribute? Is DCA included ot not? I see them in the following slides. Please clarify and list all contributions to the systematic uncertainties.
As they should be accounted in systematic uncertainties as well.

Slides 28, 29, 20:
I guess that the fact that you applied the Barlow test caused you very so different systematic uncertainties for separate points,
Can you demonstrate how these systematic uncertainties look if you don’t apply the Barlow test? Here we need to clarify how these systematic should be really estimated before we grant preliminary labels.

Thanks,
Hanna




Hanna Paulina Zbroszczyk
PhD DSc Eng, Professor WUT

E-mail: hanna.zbroszczyk AT pw.edu.pl
Tel: +48 22 234 5851 (office)

Address:
Warsaw University of Technology
Faculty of Physics
Nuclear Physics Division
Koszykowa 75
Office: 117b (via 115)
00-662 Warsaw, Poland


Wiadomość napisana przez 曾钰 via Star-cf-l <star-cf-l AT lists.bnl.gov> w dniu 10.08.2023, o godz. 14:59:

Dear All,


Best regards,
Yu Zeng
 
 
 
------------------ Original ------------------
From:  "樊碧君 via Star-cf-l"<star-cf-l AT lists.bnl.gov>;
Date:  Thu, Aug 10, 2023 08:27 PM
To:  "star-cf-l"<star-cf-l AT lists.bnl.gov>; 
Cc:  "樊碧君"<bjfan AT mails.ccnu.edu.cn>; 
Subject:  Re: [Star-cf-l] CF PWG meeting, August 10th, 2023, time: 9:00 (BNL time)
 
 
------------------ Original ------------------
From:  "樊碧君"<bjfan AT mails.ccnu.edu.cn>;
Date:  Tue, Aug 8, 2023 02:38 PM
To:  "star-cf-l"<star-cf-l AT lists.bnl.gov>; 
Cc:  "Nonaka"<nonaka.toshihiro.ge AT u.tsukuba.ac.jp>; 
Subject:  Re:[Star-cf-l] CF PWG meeting, August 10th, 2023, time: 9:00 (BNL time)
 
Dear Hanna and Toshihiro,
I 'd like to give an update of about K+K+ femtoscopy at 3.0-3.9 GeV and request the preliminary about K+K+ femtoscopy at 3.2-3.9 GeV. Please kindly add me to the agenda. Thank you very much!
Best,
Bijun
 
 
 
------------------ Original ------------------
From:  "野中俊宏 via Star-cf-l"<star-cf-l AT lists.bnl.gov>;
Date:  Tue, Aug 8, 2023 10:46 AM
To:  "star-cf-l"<star-cf-l AT lists.bnl.gov>; 
Cc:  "Nonaka"<nonaka.toshihiro.ge AT u.tsukuba.ac.jp>; 
Subject:  [Star-cf-l] CF PWG meeting, August 10th, 2023, time: 9:00 (BNL time)
 
Dear CF Activists,

We will have our weekly CF PWG meeting on Thursday, August 10th, 9:00 AM (BNL time).

If you would like to contribute, please let us know.

Please try to post your slides at your earliest convenient.
We will connect via Zoom. Please find the connection details under the meeting webpage.

Thank you,
Best regards,
Hanna and Toshihiro

https://drupal.star.bnl.gov/STAR/blog/luoxf/correlations-and-fluctuations
https://drupal.star.bnl.gov/STAR/blog/gos/correlations-and-fluctuations-preliminary-plots
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