sPHENIX discussion of physics

["Perepelitsa, Dennis" <dvp AT bnl.gov>]

Hi Tony and all,

On the question from Murad about the assumed polarization — 

I believe the 0.57 number comes from Table 3 of the C-AD guidance document here: https://www.rhichome.bnl.gov/RHIC/Runs/RhicProjections.pdf , also attached as a screenshot for convenience.

0.57 is the P_max achieved in 2015 polarized proton running (averaged over RHIC store) - note that the expected P_max in 2024E polarized proton running is only increased up to 0.60 (and the P_min is still 0.57).

So I do not think we have a basis to use a very different number…

Dennis

On May 4, 2022, at 11:08 AM, Anthony Frawley <afrawley AT fsu.edu> wrote:

Here are the minutes from today's meeting.

Tony

Beam use proposal 

--------------------------

Dennis: Can regenerate the previous BUP plots from HF/Q, doing some relabeling. Have updates to the Upsilon plots to include the 3S, and 0-60% comparison with STAR results from Sasha Lebedev.

HF jet z_g: Jin:

Showed projection for statistical precision for soft-drop grooming for b jets.

New plot in slide 6, based on Li, Vitev paper.

Dennis: We should include this in the BUP, making clear it shows statistical power - systematics TBD.

Murad: Would be nice to show this with g->bb_bar included (~ 10% effect).

Decided to stick with this plot as-is.

Jin: Thomas is working on D0/D0_bar separation. BUP21 had a plot of the combined A_N for them. Do we want to try to make separate plots of transverse spin asymmetry for D0 and D0_bar?

Decided it is not clear that we understand things well enough yet.

Murad: BUP21 plot assumes polarization of 0.57. Seems low. Using a polarization of 0.6-0.7 could make a big difference to the uncertainties.

Electron ID: Weihu Ma:

-------------------------------

Showed results of multi-variable-analysis of hadron rejection factor for several ML methods.

Get rejection factors of ~ 200 (factor of 2 increase) by including E(inner HCal)/E(EMCal) and EMCal cluster chisq with E(EMCal)/p.

Need to see how it works with embedding in Hijing events next.

BDT method seems consistently a little better than the others.

Slide 5: Why does BDT look so much better than the others in the left plot on slide 5? Highly expanded x-axis scale.

 

Next meeting: May 18.

---

From: Anthony Frawley
Sent: Tuesday, May 3, 2022 2:02 PM
To: sphenix-hf-Jets-l AT lists.bnl.gov <sphenix-hf-jets-l AT lists.bnl.gov>; Sphenix-upsilons-l AT lists.bnl.gov <Sphenix-upsilons-l AT lists.bnl.gov>; sphenix-physics-l AT lists.bnl.gov <sphenix-physics-l AT lists.bnl.gov>
Cc: Anthony Frawley <afrawley AT fsu.edu>
Subject: joint HF/Quarkonium, TG meeting on May 3 (Wed) at 9:30AM ET

 

Hi Everyone

 

We will hold the next meeting for the joint HF/Quarkonium TG on May 3 (Wed) at 9:30AM ET.

We have the following talks on the agenda:

• Introduction: co-convenors
• BUP22 preparation: Dennis Perepilitsa

• HF jet z_g: Jin Huang
  

Electron ID update: Weihu Ma

If you have something to present, please contact us.

Please join us via:
https://indico.bnl.gov/event/15481/

Zoom: https://bnl.zoomgov.com/j/1613938007?pwd=QjYzUnpYQ2xNZWZLSy9qd3Z4dFpzZz09


Best regards 
Jin, Hideki, Tony and Marzia

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Dennis V. Perepelitsa

Assistant Professor, Physics Department

University of Colorado Boulder