STAR HardProbes PWG

[Rosi Reed <rosijreed AT lehigh.edu>]

Hi Diptanil,

I think your slide 4 might be a little confusing - on the left you show the CMS plot which very much agrees with the statement about the lost energy being recovered, but the right plot isn't a ratio (right?), so I had to start at it a while because I was wondering why the STAR results didn't show the same thing. 

On slide 6, I assume the statement about the dispersion comes from CMS?  It really seems like a much stronger statement than the data shows given that the data points essentially touch 1 in the ratio.

I think it would really be good to maybe explicitly state that the dead cone effect goes in the opposite direction from the normal energy recovery - so for these jets you have somewhat a competing effect if you look at the jet shape.  (Though now you're looking at the distance between the D0 and the jet axis, so the story you're telling here is a little confusing.  Do we really need to discuss the jet shape at all?  How should that be related to the angular distance between the D0 and the jet?)

I actually think the * is unnecessary - the comment that pythia fragmentation is fine to make, but I think 95% of all jet unfolding uses pythia fragmentation in the response matrix.  Sometimes people play a game with q vs g or something like that, but since this is standard you're going to confuse more people with this notation than educate.

It would be nice once you show your nice results to have a slide were you at least put the CMS results on the same slide to at least think about a qualitative comparison.

I'm 99% sure your talk will be on Saturday the 13th if you want to put that on your slides.

Cheers,

Rosi

On Wed, Oct 5, 2022 at 8:04 PM Diptanil Roy via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hi Yi, thank you for your feedback. I have implemented them in this new version available here (https://drupal.star.bnl.gov/STAR/system/files/HotQuarks_DiptanilRoy_v2.pdf).

p12: Could you please remind me what "*" means in the R_CP?

The * in R_CP is because we have the underlying assumption of the PYTHIA fragmentation function. We aren't certain yet if the R_CP is biased by the choice of our fragmentation function, hence the *.

Please let me know if you have any further comments. Thank you.

On Wed, Oct 5, 2022 at 12:49 PM Yi Yang <yiyang0429 AT gmail.com> wrote:

Hi Diptanil,

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

 p3: It would be good to have some description of rho variable 

 p4: Bremsstrahlung --> bremsstrahlung

 p5: add a reference for dead-cone effect? 

 p12: I would suggest removing "New for QM22", or change it to "New from STAR". 

 p12: Could you please remind me what "*" means in the R_CP?

 p14: Should we use "charm quark jet" instead of D0-tagged jet here (to be consistent with the title)? I understand that the D0-tagged jet is more specific... actually I am fine either way. 

Cheers,

Yi

On Wed, Oct 5, 2022 at 10:12 AM Diptanil Roy via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Hi everyone, please find my talk for Hot Quarks 2022 below. I apologise for the delay. I am not asking for any new preliminaries for this talk. Please let me know your feedback. Thank you.

On Tue, Oct 4, 2022 at 10:07 PM webmaster--- via Star-hp-l <star-hp-l AT lists.bnl.gov> wrote:

Dear Star-hp-l AT lists.bnl.gov members,

Diptanil Roy (roydiptanil AT gmail.com) has submitted a material for a review, 
please have a look:
https://drupal.star.bnl.gov/STAR/node/61263

Deadline: 2022-10-11
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If you have any problems with the review process, please contact 
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Rosi Reed
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Associate Professor, Physics Department
Lehigh University
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