sPHENIX discussion of physics

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

Please find a transcript of the meeting at https://otter.ai/u/-LfyYO_Okj7cCiToQTL8XcedbO0?utm_source=copy_url 

 

Announcement: 

Cameron: KFParticle patch to handle new field map (that do not have z=0.0cm point reading)

 

 

D0 commissioning analysis : Xuan Li

 

Decay track vertex: 

Cameron: truth matching is available to obtain the true secondary vertex

N_track: is related to the primary vertex. 

Jin: when N_track is small, the secondary vertex track may have a drag in the primary vertex determination.  

 

Slide 9: 

Cameron: Every event has a fully constructed D0 but could scale the background to get a general sense of the level of combinatorial background in MB pp collisions

 

Gregory: what is the peak in the background

Xuan: simple background fit, will be improved. 

Cameron: also the misPID swap spectrum. 

Marzia: misPID and signal fit should have a fixed ratio and be used in the total fit. 

Jin: plot both truePID and misPID peaks from this data

 

Jin: serious MVA cut tuning requires MB pp simulation. 

Tony: A realistic study also requires a look into streaming extended readout window. 

 

Action items: 

• - Coordinating with the tracking and heavy flavor groups to generate a more realistic PP simulation sample resembling extended readout data from the experiment.
• - Following up offline to separate the study of primary and secondary vertex reconstruction quality as a function of track numbers using truth information.
• - Study the component of D0 mass peak that comes from the misPID piK pairs, as in a few pT  bins
• - Continuing the analysis work while bearing in mind the need for a more realistic background simulation once real data is used.

 

 

Photon conversion commissioning analysis : Zhongling 

 

Zhongling: input is MDC2 MB AuAu events. 

Zhongling: Conversion radius is reconstructed from KFParticle

 

Jin: please use the simulation truth information to help determine the optimal cuts

Tony: most conversion happens outside MVTX, at INTT or TPC field cage

 

Cameron: KFParticle may have a default MVTX hit requirement of 3. Please remove it for conversion analysis

 

Jin: do check each step of reconstruction where this was lost. 

 

Tony: Please check pp runs, which will be directly useful in the Run24 analysis.  

 

Action items: 

- Retrieving truth information from the simulation to help benchmark reconstruction and guide selection criteria optimization.

- Looking into pp events that directly help with Run24 Quarkonion commissioning 

 

 

 

 

 

 

 

 

 

______________________________

 

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: Tuesday, April 16, 2024 4:41 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] Heavy Flavor/Quarkonium TG meeting Wed Apr 17 at 1:30PM ET

 

 

Dear all

 

Reminder of our joint Heavy Flavor/Quarkonium TG meeting Wed Apr 17 at 1:30PM ET. 

Currently on the agenda at  https://indico.bnl.gov/event/22989/  . The topics on agenda are
 
•   D0 update -  Xuan Li (LANL)

•   Conversion photon commissioning analysis – Zhongling Ji (UCLA)

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

______________________________