STAR HardProbes PWG

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

Hi Nihar,

thanks for the updated slides. Please find below a few additional comments.

- s2: add time of Nasim's talk

- s3: I suggest adding TOF to the list

- s6: I would remove this slide and add the new polarization results, it's not new and doesn't bring much more to what you already show on slide 5 and 7

- s7: I wouldn't have (only) LHC conclusion here, you can add conclusion regarding STAR results, e.g. no dependence on collision energy observed -> interplay of dissociation and regeneration effects at RHIC energies

- s8: please use here newer Preliminary plots from Ziyue, that include both the published and preliminary data with newer model predictions

- s16: pattern -> pattern R_AA

- s16: excited Υ(nS) -> excited Υ

- s18: 

suppression -> sequential suppression

Confirming QGP thermal properties -> Information on QGP thermal properties

remove "Regeneration effect dominant at LHC "

collision system -> collision system and energy

you can add: " Interplay of dissociation and regeneration effects"

for heavy-flavor -> for quarkonium

Cheers,

Barbara

On Thu, Feb 22, 2024 at 11:33 AM Nihar Sahoo <nihar AT rcf.rhic.bnl.gov> wrote:

Hello Yi,

Thank you for your comments. I have implemented all your comments and
modified my slides a bit in version-2.

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 2024-02-22 08:50, Yi Yang wrote:
> Hi Nihar,
>
> Thanks a lot for the nice slides.
> I have some minor suggestions on v1 for your consideration.
>  - page 2: baryon density QCD medium --> baryon density in QCD medium
>                 I would indicate ccbar is J/psi and bbbar is Upsilon
> (probably everyone knows that)
>  - page 6: The reference should be "Phys. Lett. B797 (2019) 134917"
> (the one you put is for RpAu)
>  - page 8: Probably you can also consider to show Ziyue/Te-Chuan's new
> results here since it still slightly improves the statistics in high
> pT.
>  - page 10: I would show the Psi(2S) signal (mass plot) instead of the
> thermometer on the right, but just a suggestion.
>  - page 15 and 16: It would be good to indicate 200 GeV collision
> energy
>
> I understand you only have 15 mins, but I would think adding Upsilon
> in isobar and J/psi at very low pT would be good in the talk.
>
> Cheers,
> Yi
>
> On Thu, Feb 22, 2024 at 1:12 AM Nihar Sahoo via Star-hp-l
> <star-hp-l AT lists.bnl.gov> wrote:
>
>> Hello Barbara and Rongrong,
>>
>> Thank you two for your nice comments.
>> Based on your comments and suggestion, I modified and restructured
>> my
>> presentation.
>> This is a 15min presentation; a few topics I do not add due to time
>> constraint.
>>
>>
> 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 2024-02-21 03:51, Barbara Trzeciak wrote:
>>> 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
>>>> _______________________________________________
>>>> Star-talks-l mailing list
>>>> Star-talks-l AT lists.bnl.gov
>>>> https://lists.bnl.gov/mailman/listinfo/star-talks-l
>>>> _______________________________________________
>>>> Star-hp-l mailing list
>>>> Star-hp-l AT lists.bnl.gov
>>>> https://lists.bnl.gov/mailman/listinfo/star-hp-l
>>>
>>> _______________________________________________
>>> Star-hp-l mailing list
>>> Star-hp-l AT lists.bnl.gov
>>> https://lists.bnl.gov/mailman/listinfo/star-hp-l
>> _______________________________________________
>> Star-hp-l mailing list
>> Star-hp-l AT lists.bnl.gov
>> https://lists.bnl.gov/mailman/listinfo/star-hp-l