STAR HardProbes PWG

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

Hello Gabe, Olga

Thanks for your responses. 

For R = 0.5 jets, I understand that the eta cut o jets is |eta_jet| < 0.5. Do you also use |eta_track| < 0.5 cut which limits the dEta range from -1 to 1? It does not seem to be the case as one can see entries beyond |dEta| = 1 on slide 4. If your cut on tracks is |eta_track| < 1.0, it shouldn't be so difficult to get to |dEta| = 1, right?

On the second backup slide, you show the dEta distribution for UE (red points). Do you use UE within 0.5 < |dEta| < 1.0 for the projection of dPhi? If so, why not use the |dEta| < 0.5 range? Actually, how do you get the entries within |dEta| < 0.5 in the first place given that the UE semi-circles are far away from the jet axis in eta?

Sorry for these naive questions. I should have followed the analysis more closely. 

Best

Rongrong

On Mar 22, 2023, at 3:38 PM, Gabe Dale-Gau <gdaleg2 AT uic.edu> wrote:

Rongrong,

To add to Olga's response, the reason we see this effect specifically in the center bins of dphi in R05 and not in the other dphi bins is due to the semicircular geometry employed in our UE definition. This is highlighted on slide 22 in backup. For all other R the semicircle does not reach the edge of our distribution in deta, but for R05 specifically, the area reaches the edge around dphi = 0.

Best,

Gabe

On Wed, Mar 22, 2023 at 10:04 AM Ma, Rongrong <marr AT bnl.gov> wrote:

Hello Gabe

Thanks for including those backup slides. 

If I understand correctly, what you mean is that the UE distribution close to the edge (|deta| ~ 1) has large error bars, which contributes to the large errors seen in dphi ~ 0. Is this correct? If so, why don't they contribute to other dphi bins? Also, since your jet-hadron range is 0.5, I would naively expect you only use UE within |deta| < 0.5. Do I miss anything?

Best

Rongrong

On Mar 21, 2023, at 4:21 PM, Gabe Dale-Gau via Star-talks-l <star-talks-l AT lists.bnl.gov> wrote:

Conveners,

Thank you for all of your comments and input. 

I have updated my Star-Talks submission here:

https://drupal.star.bnl.gov/STAR/presentations/Hard-Probes-2023/Baryon-Meson-Ratios-AuAu-and-pp-collisions-sqrtsNN-200-GeV

I have implemented many changes in this version to address all of the comments I received from Nihar and Barbara, as well as general rephrasing throughout to simplify text on slides.

Rongrong, the first three slides in the backup section are included to address your question about the origin of two strange points in the Au+Au correlated jet peak signal.

I will create a separate drupal page with figures included as individual files shortly.

Let me know if you have further questions or comments.

Many thanks,

Gabe

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