PPG04 (UE in Au+Au) - PPG/IRC meeting #1

Monday 3 Mar 2025, 11:30 → 14:45 US/Eastern

Zoom coordinates:   https://tennessee.zoom.us/j/87528248437

Topic: IRC PPG04 Meeting
Time: Mar 3, 2025 11:30 AM Eastern Time (US and Canada) 

 

-do we understand why embedding jobs are failing? Seems to be random, these require a lot of memory which limits the machines they can run on. Is a common problem with other production/simulation jobs
-new calibrations are just now available, might not have time before QM to rerun embedding jobs with this. Tanner is following up on check of its affect on this analysis
-where is the event plane going to be documented? We've been working with Ejiro who has a local version of calibrations of EP. We likely will use the uncalibrated event plane angles. 
-would like to see a toy study of effects from finite event plane resolution
-what about centrality documentation? Should be documented in PPG03 paper
-for the 30 GeV probe is that the same as the embedding? No, this is just added into the anti-kt algorithm directly
-slide 7: suggestion from Gunther to change plots to go peripheral to central 
-why not use more bins like in the ATLAS plot? Just consistency with binning in other measurements. Can potentially make this finer- this isn't particularly statistically limited
-are we planning to compare to HIJING? Not currently, we don't want to include mis-modeling of sPHENIX in geant as part of that comparison. 
-is there a plan to compare to geant in the final paper? Not necessarily planned but we could potentially
-is there any confirmation that the fits are describing the data well? Yes fits are included in the note
-slide 9: question about the two methods not really agreeing
-slide 13: you get an excess on the right hand side (maybe from real jets). Why are the red points (randomized eta phi) further from their gaussian fit than the blue points from theirs? Seems hard to say if they really are further away- will check 
-Why is the mean in the randomized distribution higher? The removal of the highest kt jets will remove upward background fluctuations (or a real jet) in the basic case, but the upward fluctuations will be spread out in the randomized case
-Tanner will check on omitting less jets 
-slide 15: is this a fit? No this is a calculation using the expectation values of number of towers and Et from the sPHENIX data
-where are the v2 and v3 coming from? These are from STAR measurements
-are there any studies looking at this comparing positive and negative rapidity (since we see asymmetries in ppg02/03)? Not currently. Could follow up with this
-how does the embedding deal with zero suppression? Currently the embedding is done at the calibrated level so its not perfect, but the zero suppression does not fully get rid of the signals so its not completely wrong
-for the ATLAS comparison to HIJING did they add flow in by hand? Yes, taken from a parameterization of data
-suggestion to look at the plot on slide 7 in smaller bins, maybe in MBD charge bins?
-meet next week same time/maybe need change time will send out a new when2meet
-conf note circulation deadline is March 24th

 

1 Analysis Overview

Speakers: Benjamin Kimelman (Vanderbilt University), Tanner Mengel (University of Tennessee (UTK)), Virginia Bailey (Georgia State University)

ppg04_irc_meeting.pdf