STAR Correlations and Fluctuations PWG

[Hanna Paulina Zbroszczyk <hanna.zbroszczyk AT pw.edu.pl>]

Dear Chuan, Zhi and all activists working on the paper proposal for p-p, p-lambda and p-xi,

You showed 2 weeks ago a paper proposal: https://drupal.star.bnl.gov/STAR/system/files/BaryonCF_3GeV_202207.pdf

As you intend to show this / similar presentation to the preview (it is my assumption, correct me if I am wrong), I would like to comment here before we move forward.

Slide 2: k* and q_inv are different quantities, should not be considered together. As you use both variables, they both should be defined correctly.

average probability of two particles -> this statement should be clarified

Wave function should be defined too (not just mentioned)

Clarify please what do you mean by the study of dynamical information by extracting the baryon source-size. I think it would beneficial if motivation slide would contain this information.

Moreover, as motivation slides, I would advise to explain what is the reason you want to publish all these systems together.

Before you show proposed figures, I would expect some general information about data: productions, selection criterias (events, tracks, pairs, etc…) all data analysis criteria that we discuss during such previews.

Slide 8: It would be nice to have somewhere (can be in the backup part) plot /information how the centrality selection is done in the UrQMD model. 

Except rapidity, do you select particles momenta according to the same criteria in the model and in the experiment?

Regarding the Figure 5: Does rapidity mentioned in the panel (d), (e), (f) refer to proton, lambda or both?

Similar question regarding p_T.. ?

q_inv can’t be used in  case of non-identical particles.

P-p correlation functions on the top panels (a), (b), (c) are not calculated as a function of q_inv

Slide 9: again, q_inv can’t be used for nonidentical particles, and p-p does not look to be shown as a function of q_inv.

Can you please clarify why except collision centralities: 0-10%, 10-20%, 20-40% and 40-60% (Figure 5) you also show the same for newly defined centrality bins (0-10%, 20-60%, 0-60%)? What is the reason for such selection? Any physics motivation hidden behind?

I see that you have p-xi- for just 0-60%, but then, I still don’t understand the reason to consider 20-60% centrality bin..

I also need to clarify: do you use the same intervals for pT in case of proton / lambda particles and proton/xi-? If so, what is the motivation to use the same intervals of pT for both particles in the correlating pair?

Slide 10: Can you show these distributions of relative r and tau that RMS’s you describe here? (Can be in the backup, the best together with calculated by ROOT numbers?)

Slide 11: can you also show these distributions?

In addition, I think that it is possible to extract precise radii for all these systems (you need to fit several theory functions and then to determine the best agreement among them using e.g. Chi2 test estimation), especially if STAR presents such results for other systems, so the technique is available in the experiment. 

Moreover, I think thet it would be very beneficial if you discuss more parameters of strong interactions you assume for p-p, p-la and p-xi-. Studies of strong interactions recently are the main object of interest among femtoscopic activists in many experiments. 

The paper proposal presentation does not discuss any estimation of systematic uncertainties. The evaluation of the systematic uncertainties should be introduced and discuss in details (or at least specified what is already done and what is still missing and should. be completed after the paper preview).

——————

Now, if I move to the p-lambda presentation from last week (presented by Zhi:) https://drupal.star.bnl.gov/STAR/system/files/LambdaProton_CF_QinZhi_20220714.pdf 

Slide 2: I understand it is about p-lambda case only. What about other systems?

Slide 3: Which of those listed criteria you include in your estimation of systematic uncertainties? And if only for p-lambda or also for other systems?

Slide 5: having lambda purity about 75%, did you correct on purity your p-lambda correlation function?

What about xi- purity? I still wondering if I should expect here the discussion of others than p-lambda systems..

Slide 9: is this an introduction to the feed-down correction? Here I must admit I am really confused, could you please put here more description?

Slide 11: Here I assume it is only for lambda particles, what about protons (and xi)?

Slide 13: your averaged geed-down fraction is of the order of 30%. Have you checked any momentum or two-particle dependence? If there is a flat dependence of feed-down particles as a function of k*, then averaged number can be used. If not, then one should be very careful as the correlation region for small k* is very fragile to such estimations. 

Slide 14: are here shown residual correlations including particles from feed-down?

Thank you very mych for many back-up slides, I am really glad to see especially how you treat feed-down particles in p-p and p-xi- systems.

However, most of backup slides  are for p-lambda system, not too much about p-p and p-xi.

Before the paper preview request I would be glad to see a complete presentation that you intent to show during PWGC preview (now I can only guess what would you add to the first presentation from the second one).

Best regards,

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 ChuanFu via Star-cf-l <star-cf-l AT lists.bnl.gov> w dniu 07.07.2022, o godz. 04:40:

Dear All,

             Please find my paper proposal slides:

https://drupal.star.bnl.gov/STAR/system/files/BaryonCF_3GeV_202207.pdf

Best regards,

Chuan

 

 

------------------ Original ------------------

From:  "ChuanFu"<fuchuan AT mails.ccnu.edu.cn>;

Date:  Wed, Jul 6, 2022 09:39 AM

To:  "Star-cf"<star-cf-l AT lists.bnl.gov>;

Subject:  Re: [Star-cf-l] CF PWG meeting July 7th (Thursday) 9:30am (BNL time)

 

Dear All,
      I would like to give the paper proposal about p-p, p-Lam. and p-Xi correlation functions in 3 GeV Au+Au collisions.

The slides will be sent later.

Best regards,

Chuan

 

 

------------------ Original ------------------

From:  "Star-cf"<star-cf-l AT lists.bnl.gov>;

Date:  Tue, Jul 5, 2022 09:42 PM

To:  "Star-cf"<star-cf-l AT lists.bnl.gov>;

Subject:  Re: [Star-cf-l] CF PWG meeting July 7th (Thursday) 9:30am (BNL time)

 

Dear All,

I would like to show an update on my analysis. It will be presented by Hanna.
Slides are under the following link: https://drupal.star.bnl.gov/STAR/system/files/CF_7July2022.pdf

Best regards,
Paweł

wt., 5 lip 2022 o 01:49 Xiaofeng Luo via Star-cf-l <star-cf-l AT lists.bnl.gov> napisał(a):

Dear CF PWG Colleagues,

We will have our weekly CF PWG meeting on Thursday, July 7th, 9:30 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 Xiaofeng

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




--
Xiaofeng Luo
Professor of Physics
College of Physical Science and Technology
Central China Normal University
Luoyu Road 152, Wuhan China
Office Phone #: +86-27-67867500


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