sPHENIX discussion of physics

["Huang, Jin" <jhuang AT bnl.gov>]

Overview: 

• Five HF/Upsilon QM23 posters proposed
• The first abstract draft is due today
• Co-conveners will edit and submit to spokesperson review
• We will find out the clarification on the procedure for final submission

 

D0 jet check - Xuan Li

 

Ming: Angular matching between reco and Truth jet is worth checking too

 

Jin: PFjet sub-component matching needs check. For example, the track constituents in the PF jet should have an energy scale of around 1.0, but the unmatched hadronic calorimeter cluster's energy scale is much lower around 0.6-0.7 as they were set closer to the EM energy scale and require an energy scale correction. The matching quality between the track and clusters needs to be checked too as shown by Antonio from the past simulation sample. Before such a detailed check, it would be very hard to interpret and use the uncalibrated PFFlow jet sample.  

 

Tony: be cautious about CB fit and the Gauss component might not be stable 

 

Xin: good to check vs light jet sample too. 

Jin: Jet TG has a large inclusive jet sample, in particular, "10 M JS TG 10 GeV truth triggered sample "

 

D0-Truth triggered module only samples a subset of phase space that can easily lead to biases which may be the cause behind the double peak on Z_proj in slide 13. Few comments: 

• This D0 jet sample was aimed to quickly put together a concentrated D0jet sample for the initial study. We should note that this lead to sampling a very specific subset of the total x-section and is vulnerable to biases. 
• Please check out Antonio's talk in the Jet TG meeting on how to composite multiple jet triggered sample to make a full x-section: https://indico.bnl.gov/event/18875/#6-simulation-sample-discussion 
• The easily-usable unbiased sample is study the leading-jet only with truth jet above the triggering threshold set in the produciton (i.e. jet pt_Truth>5 GeV for the CharmD0piKJet5 sample, and pt_Truth>23GeV for the CharmD0piKJet12 sample)

 

D0 in distortion - Thomas Marshall

 

Yuanjing: how truth inv mass has a flat background ?

Zhaozhong: EvtGen should be configured for Kpi-only decay

Jin: suspect the random 6 pions per event lead to combinatorial background

 

Yuanjing: Non-gaussian shaped is suspicious 

Thomas: stat is small, working with Cameron with higher stat.

 

Xin: Expect exact inv. mass using truth info

Xin: Suggest also checking D0 efficiency with/without distortion, .e.g due to distortion-induced MVTX matching loss

 

 

 

 

 

______________________________

 

Jin HUANG

 

Physicist, Ph.D.

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

From: Huang, Jin
Sent: Thursday, March 23, 2023 12:37 PM
To: Sphenix-upsilons-l AT lists.bnl.gov; sphenix-hf-Jets-l AT lists.bnl.gov
Cc: sphenix-physics-l AT lists.bnl.gov
Subject: Reminder: HF/Q TG Meeting Friday at 3pm ET

 

Dear all

 

Reminder of our joint Heavy Flavor/Quarkonium TG meeting Friday at 3pm ET. 

Currently on the agenda at https://indico.bnl.gov/event/18852/ we have:
 
•    Introduction - Conveners
•    K-short reconstruction with distortions - Zhaozhong Shi
•   D0 in AuAu plot update – Cameron Dean
 
The zoom link is bnl.zoomgov.com/j/1613938007?pwd=QjYzUnpYQ2xNZWZLSy9qd3Z4dFpzZz09
 
We look forward to talking to you!

Marzia, Cameron, Jin, and Tony

 

 

 

______________________________

 

Jin HUANG

 

Physicist, Ph.D.

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________