STAR HardProbes PWG

["Ma, Rongrong" <marr AT bnl.gov>]

Hello Nihar

Thanks for your comments. 

I thought a bit more on this. Since my talk is now really a STAR overview talk (the organizer wanted me to give a RHIC physics overview at the beginning), I think it is more appropriate to go through the official approval procedure. So I have submitted the latest version on Drupal (https://drupal.star.bnl.gov/STAR/node/65722) after addressing your comments. 

Please see my replies inline:

On Oct 25, 2023, at 2:43 AM, Nihar Sahoo <nihar AT rcf.rhic.bnl.gov> wrote:

Hello Rongrong,

Thank you for sharing your nice presentation slides on heavy-flavor.
Overall your slides look nice and capture all physics measurements of STAR.

Here are my additions comments for your consideration.

Slide5:
- "Charm quark gain v2 at T close to Tc" -> what is "Tc" here ? And What is the value of Tc? Why it is important?

Tc is the pseudo-critical temperature around 165 MeV. Here the point is that the medium temperature created at 54.4 GeV is expected to be lower than that at 200 GeV. Yet, we see similar HFE v2, which indicates that HFEs obtain their v2 mainly at T close to Tc. Otherwise, one would see a larger v2 at 200 GeV than 54.4 GeV. 

Slide7:
- "About a factor of 2 suppression…" -> Not clear, with respect to what

This is just another way of saying R_AA ~ 0.5. I added "compared to p+p"

Slide9:
- Do you need to refer "QM2023" for this D^0+jet results? Same for next slide

Since I now treat this talk as a STAR talk, I do not think a reference to QM2023 is needed. 

SLide13:
- Better to motivate this result with QGP effect can smear D^0-D^0bar correlation. But uncertainty limits to pin down

I will mention this motivation verbally during my talk. 

Slide14:
- "Coalescence is important" -> Do we need to mention also "at low pT"?

That's mostly true, but I do not feel this needs to be stated explicitly on the slide since the two figures show results starting from 1.5 GeV/c and 3 GeV/c. 

After Slide16, It would be good to summarize the key physics that we observed from open heavy flavor measurements at STAR. Otherwise people may be lost.

I added half of the original summary slide here. 

Slide18:
-"Hint of rising trend toward low energy" -> Is that correct to comment within these uncertainties?

I removed that sub-bullet, but I will probably mention this verbally as a question rather than a conclusion.

_ You could hint to the "primodial" and "Regeneration" effects at high and low energies.

Added a sub-bullet.

Slide19:
-Could you comment on QGP thermal temp based on sequential suppression of quarkonia? That is important take away from these results at RHIC.

I added a half sentence on this. I intentionally kept it vague since the connection is less straightforward as originally envisioned. 

SLide20-22:
Physics motivation is missed here. Better to say a few words.

Added a bullet.

Slide21-23:  better to motivate with other pesudoscalar meson results from FCV.

Added a figure from the Nature paper

After Slide23: You could summarize the key physics learnt from QGP point of view.
And then you can go to UPC J/psi results discussion to study other Physics not related to QGP.

Since I only have two slides on UPC J/psi, I kept the summary slide at the end. 

Best

Rongrong

Best
Nihar


On 2023-10-24 20:33, Ma, Rongrong via Star-hp-l wrote:

Dear All
I was invited by the CFNS-npQCD workshop
(https://indico.cfnssbu.physics.sunysb.edu/event/110/) organizers to
present an overview of the STAR heavy flavor results. Even though it
is not a STAR talk, I will exclusively present STAR results. So I
would like to seek your comments and suggestions on my talk, a first
draft of which can be found here:
https://drupal.star.bnl.gov/STAR/system/files/RMa_CFNS_npQCD_v1.pdf.
Your feedback is more than welcome. Thanks.
Best
Rongrong
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