STAR HardProbes PWG

[Barbara Trzeciak <barbara.trzeciak AT gmail.com>]

Hi Nihar,

Please find below a few comments from my side. 

- Add references to the published results

- s2: Following up on Rongrong's comment, I would even remove the thermometer picture from there. We know it's a very simplified picture, and I don't think it's needed for this expert audience. 

By the QGP thermalization I guess you mean the QGP temperature. But again, one needs to be careful here, it's not only the static Debye screening but the dynamical processes play a role.  

And instead of the heavy flavor motivation that you have now, you can say here that there are different process that influence quarkonium production: dissociation (both static and dynamical), regeneration + cold nuclear matter effects

- s9: remove "Smaller charm production rate at RHIC"

- s10: Title: I guess you want to emphasise here isobar collision results - I would change the title. The Au+Au results you either show on the previous slides or are already old.   

And I would add here (or add a slide before this one) motivating studies in smaller isobar collisions, e.g.: study dependence of hot nuclear medium effects on medium size and energy density.

And I would use here a simpler plot that we have, without the LHC data.

- s10: "or/and charm flow in QGP at RHIC" - you mean no or small flow ? 

- s11: I would suggest adding the J/psi polarization in isobar collisions. If you don't have time, I think it might be more interesting in this workshop than the rho00 result.

- s12: suppression in heavy-ion collisions- > sequential suppression in heavy-ion collisions at RHIC

- s12: remove "Confirms QGP thermalization and Debye screening in QGP", I suggest "QGP thermal properties"

- I'm not sure what you want to say with the second bullet, it's quite generic statement

Cheers,

Barbara

On Tue, Feb 20, 2024 at 10:19 PM Ma, Rongrong via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hello Nihar

Thanks for updating your slides. I have few more comments for your consideration: 

Slide 1: change the title to "Recent quarkonium results in ..."

Slide 2: 

- here you show the thermometer picture and mention " Debye screening". However, you do not really explain what they are. The second bullet reads more like an open HF introduction. 

- Given the realization of imaginary part of the potential, I think it is better to say dissociation in general, which includes both static ("Debye screening") and dynamic processes. At least, you should mention dynamical dissociation along with Debye screening.

- Throughout the presentation, you mention a few times about "QGP thermalization". Could you elaborate how one connects quarkonium suppression with QGP thermalization?

- For Nasim's talk, I think it is better to be titled "quarkonia in p+p"

- I think QGP usually stands for Quark-Gluon Plasma

Slide 3: 

- since you do not show any open HF results, I do not think you need the HFT picture

- Forward Silicon Track -> FST

- Forward EMCal and HCal -> FCS

Slide 8

- This slide reads like an introduction slide for quarkonia, which should be moved to slide 2?

- charm quark dissociation -> quarkonia dissociation 

Slide 9: I feel this slide should go together with slide 4 which also discusses about energy dependence

Slide 10: it is not clear what you want to say about the left figure. The energy dependence has been discussed earlier. If you want to focus on the system size dependence, I have a version of the figure with only 200 GeV collision systems:  https://drupal.star.bnl.gov/STAR/system/files/Jpsi_Isobar_AuAu.pdf. Also it is probably better to split this slide into two. 

Slide 11: our vector meson spin alignment paper concluded that the QGP's global angular momentum, as observed in Lambda polarization, actually contributes very little to the observed vector meson spin alignment. One possible origin is the strong force field, which applies to phi meson and should also apply to Jpsi. This is a main motivation to measure Jpsi spin alignment, I think.

Best

Rongrong

On Feb 17, 2024, at 1:50 PM, Nihar Sahoo <nihar AT rcf.rhic.bnl.gov> wrote:

Hello Rongrong,

Yes, you are correct. I was diverted a bit from the theme of this workshop.
Ok, I corrected those with a discussion of J/psi RAA and v2 from Isobar.

https://drupal.star.bnl.gov/STAR/presentations/QWG-2024/Recent-heavy-flavor-results-heavy-ion-collisions-STAR

Please have a look.

Thank you
Nihar





On 2024-02-16 22:14, Ma, Rongrong wrote:

Hello Nihar
The invitation is intended for presenting recent quarkonium results in
heavy-ion collisions at STAR since it is a quarkonium workshop. So, I
think it is probably not so relevant to present open HF results
(slides 9-11). Instead, you can consider talking about Jpsi and
Upsilon Raa, Jpsi v2, Jpsi polarization in Isobar, for example.
Thanks.
Best
Rongrong

On Feb 14, 2024, at 5:33 AM, Nihar Sahoo via Star-hp-l <Star-hp-l AT lists.bnl.gov> wrote:
Hello HP-pwg,
This is an invited talk from startalk to present at QWG2024 at Mohali, India, on "Recent heavy flavor results in heavy ion collisions at STAR".
It would be great to have comment/feedback from hp-pwg. Please have a look.
Thank you
Nihar
On 2024-02-14 15:57, webmaster--- via Star-talks-l wrote:

Dear star-talks-l AT lists.bnl.gov members,
Nihar Sahoo (nihar AT rcf.rhic.bnl.gov) has submitted a material for a review,
please have a look:
https://drupal.star.bnl.gov/STAR/node/66782
Deadline: 2024-02-26
---
If you have any problems with the review process, please contact
webmaster AT www.star.bnl.gov
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