STAR HardProbes PWG

[Yi Yang <yiyang0429 AT gmail.com>]

Hi Qian,

Thanks a lot for the nice slides. I have some minor suggestions for your consideration. 

 - p4: observable --> observables 

 - p9: You didn't mention which dataset you are using. 

 - p14: The title is overlapped with the STAR Logo

 - p17: HIC --> heavy-ion collisions 

 - p18: you said "no significant pT dependence", but in p10 you mentioned "Hint of a non-trivial pT dependence at

low-pT range in the HX frame". I think we did this in QM, but now I think it is a bit contradictory. I would suggest making them consistent. 

Cheers,

Yi

On Wed, Dec 6, 2023 at 12:55 PM tc88qy <tc88qy AT rcf.rhic.bnl.gov> wrote:

Hello Nihar，
Thanks for your comments, please find my rely inline. Also the new
version has been uploaded.

Qian Yang

On 2023-12-05 11:34, Nihar Sahoo wrote:
> Hello Qian,
>
> Please find my comments on your nice presentation slides.
>
> SLide-4:
> Not sure, what is the purpose of left figure?
> Left side theory plot is for J/psi polarization in jet where as right
> side is for inclusive J/psi polarization.
> There are different. The comparison may not be correct. Is not it?

It is not a comparison, but two examples that proved J/psi polarization
is a key observable in p+p to understand the production mechanism.
>
> Besides, Left figure for x-axis J/psi FF (zh) where as the right data
> plot x-axis is Jpsi pT.
> I understand the purpose of left side figure. But I think this may be
> an incorrect comparison to motive the physics.
>
> Slide5:
> More fruitful process related to J/ψ in heavy-ion collisions: ->
> Leading J/psi production mechanisms in heavy-ion collisions:

There is also dissociation of J/psi in QGP, which is not a production
mechanism and absent in p+p. so I think leading J/psi production
mechanisms is not that precise.

> Coalescence -> is this "co-mover"?

Co-mover normally used to describe one of the cold nuclear effect of
J/psi suppression.
For a pair of charm and qnti-charm bonds to a J/psi at the phase
boundary, we normally used the word coalescence/regeneration.

>
> SLide6:
> "J/ψ polarization at small pT,…" -> This discussion, in this slide,
> seems out of context. I would suggest remove this or make it clear how
> this is related with Modification of J/ψ feed-down. Or Am I
> misunderstood?

I made some modification on this slides. The plots gives an example of
feed-down contribution modification due to the QGP. While this text
gives prediction of such modification will introduce a J/psi
polarization.

>
> Slide13:
> "Particle by Particle polarization of J/ψ in QGP" -> Not clear what is
> particle-by-particle?
Yes, it is misleading. I remove this part.
>
> Best
> Nihar
>
>
> On 2023-12-04 21:03, tc88qy via Star-hp-l wrote:
>> Hi Yi,
>>
>>  I have uploaded the file again, Please check.
>>
>> Qian Yang
>>
>> On 2023-12-04 16:07, Yi Yang via Star-hp-l wrote:
>>> Hi Qian,
>>>
>>> I removed the 66133 and we will comment on 66134
>>> (https://drupal.star.bnl.gov/STAR/node/66134).
>>> But it seems the file in 66134 is also removed, could you please
>>> upload again? Thanks a lot.
>>>
>>> Cheers,
>>> Yi
>>>
>>> On Fri, Dec 1, 2023 at 10:27 PM webmaster--- via Star-hp-l
>>> <star-hp-l AT lists.bnl.gov> wrote:
>>>
>>>> Dear Star-hp-l AT lists.bnl.gov members,
>>>>
>>>> Qian Yang (tc88qy AT rcf.rhic.bnl.gov) has submitted a material for a
>>>> review,
>>>> please have a look:
>>>> https://drupal.star.bnl.gov/STAR/node/66134
>>>>
>>>> Deadline: 2023-12-15
>>>> ---
>>>> If you have any problems with the review process, please contact
>>>> webmaster AT www.star.bnl.gov
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