STAR Correlations and Fluctuations PWG

[Anna Kraeva <annakraeva555 AT gmail.com>]

Dear Nu,

Sorry for the long reply.

1. This is a two-track acceptance, not a since-particle one. I added the single-particle acceptance to the slide 4. As for the particle pairs, all STAR published results started from kT (half of pair transeverse momentum). One of the reasons that those low-kT pairs will be mostly particles that fly back-to-back, the other reason will be the influence of two-track effects for single-particle with low-pT each. Those likely will be merged for kT<0.15 GeV/c

2. Here we have two main contributions: 1) acceptance effecto due to the fact that we register particles that fly only towards forward direction (that can be shown using toy model, also it was demonstrated by HADES https://arxiv.org/abs/1910.07885 ); 2) tilt due to the directed flow. The contribution from the later is very small for azimuthally-integrated analysis but will be seen when study the dependence of femtoscopic radii w.r.t. the reaction plane. We are working on the quantitative evaluation of the effect using the models. Currently, the centrality dependence of the Rol^2 component is opposite to the centrality dependence of the directed flow slope for pions (this also suggests that the effect is mostly acceptance-driven).

Best regards,
Anna

ср, 16 авг. 2023 г. в 12:27, Nu Xu <nxu AT lbl.gov>:

Hi Anna and All,

Nice results. I have two questions:
1) slide 9: It appears that pions are identified almost to zero pT, why the analysis starts at 150MeV/c?
2) slide 10 -  R_OL^2 plot: I am not sure we should label it “asymmetry” with respect to mid-rapidity. It reflects the tilt of the pion source in the O-L plane.
Is it related to the strength of v1? If it is, is the centrality dependence consistent with our v1 data?

Regards,

Nu

> On Aug 16, 2023, at 2:10 AM, Anna Kraeva via Star-cf-l <star-cf-l AT lists.bnl.gov> wrote:
>
> Dear Hanna and Toshihiro,
>
> Thank you for your comments! I have uploaded a new version of the presentation. Please have a look:  https://drupal.star.bnl.gov/STAR/node/64541
>
> Best regards,
> Anna
>
> ср, 16 авг. 2023 г. в 04:15, 野中俊宏 <nonaka.toshihiro.ge AT u.tsukuba.ac.jp>:
> Dear Anna,
>
> I sign off your nice slides with one minor comment below:
>
> Title page: Add space before/after the "="
>
> Best regards,
> Toshihiro
> 差出人: Star-cf-l <star-cf-l-bounces AT lists.bnl.gov> が Hanna Paulina Zbroszczyk via Star-cf-l <star-cf-l AT lists.bnl.gov> の代理で送信
> 送信日時: 2023年8月16日 0:03
> 宛先: Anna Kraeva <annakraeva555 AT gmail.com>
> CC: Hanna Paulina Zbroszczyk <hanna.zbroszczyk AT pw.edu.pl>; star-cf-l AT lists.bnl.gov <star-cf-l AT lists.bnl.gov>
> 件名: Re: [Star-cf-l] STAR presentation by Anna Kraeva for ISMD 2023 submitted for review   Dear Anna,
>
> Thank you for implementing my comments.
> I have the only one: slide 5, you actually define q_inv there, instead of q (the formula).
>
> With this implemented, I sign off.
>
> 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 Anna Kraeva <annakraeva555 AT gmail.com> w dniu 14.08.2023, o godz. 12:39:
>>
>> Dear Hanna,
>>
>> Thank you for your comments!
>>
>> I took into account all your comments and updated the presentation. Please have a look: https://drupal.star.bnl.gov/STAR/presentations/ISMD-2023/Two-pion-Bose-Einstein-correlations-AuAu-collisions-3-GeV-STAR-experiment-0
>>
>> Best regards,
>> Anna
>>
>> сб, 12 авг. 2023 г. в 13:56, Hanna Paulina Zbroszczyk via Star-cf-l <star-cf-l AT lists.bnl.gov>:
>> Dear Anna,
>>
>> Please find my comments on your nice ISMD presentation:
>>
>> Slide 2:
>> Femtoscopy helps to determine EoS not only in the case of QGP but might help look for signatures of the phase transition as well, so regarding the first bullet, please specify whether you mean the QGP properties (higher energies) or determination of the EoS (not only QGP should be mentioned then).
>>
>> A similar comment comes regarding the second bullet. The structure of the source is studied for higher energies as well.
>> Instead of these two bullets stating higher and lower energies, you could mention: 1. EoS; 2. Geometry/shape/structure of the source.
>>
>> Slide 5:
>> It is contains quantum-statistical correlations (QS) and final state interactions -> It contains correlations due to quantum-statistics (QS) and final state interactions (FSI, Coulomb dominated).
>>
>> Are from -> come/originate from (twice)
>>
>> Physics correlations -> femtoscopic correlations
>>
>> Please visualize/discuss out-long (ol) component.
>>
>> These 2 figures are really small. Try to enlarge them.
>>
>> q_inv is not defined (define or use q instead)
>>
>> It would help if you briefly discuss the reference frame (LCMS).
>>
>> You may split this slide into two separate ones. It helps to clarify the content of your presentation.
>>
>> Slide 9:
>> More discussion about the out-long component will be appreciated.
>>
>> More when other preliminary labels will be granted.
>> 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 webmaster--- via Star-cf-l <star-cf-l AT lists.bnl.gov> w dniu 09.08.2023, o godz. 18:55:
>>>
>>> Dear star-cf-l AT lists.bnl.gov members,
>>>
>>> Anna Kraeva (annakraeva555 AT gmail.com) has submitted a material for a review, 
>>> please have a look:
>>> https://drupal.star.bnl.gov/STAR/node/64541
>>>
>>> Deadline: 2023-08-21
>>> ---
>>> If you have any problems with the review process, please contact 
>>> webmaster AT www.star.bnl.gov
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>>
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