Introduction: co-conveners
- Jin: c_cbar with and without pp pile-up coming with the latest production. Will request special sets with residual TPC distortion for specialized decay study
for early data.
- Tony: pp collision, pile up, and extended readout. You will have access to 10-20 collisions. Tracking handles it well in simulation and should exercise analysis
in this mode that is consistent with real data mode.
- Marzia/Tony: The track comes with a beam crossing number identifying whether it is coming from an L1-triggered event or the added streaming recorded M.B. pp
collisions.
Feasibility study of extending low-pT Lc measurement with TPC PID: Charles Hughes
Slide 3: sim configuration
- Jin: without a calorimeter, there are loopers back to the tracking detector which makes the tracking harder. Good enough for the feasibility study nonetheless.
- Zhaozhong: good to try EvtGen decayer for higher quality simulation
Slide 5: inv mass
- Zhaozhong: truth value for the invariant mass worth checking
- Yuanjing: good to also check the daughter tracks are from real LC decays
- Tony: is mass spectrum truth guided or has mis_PID combinatorial
- Cameron: mis-PID combinatorial are excluded in this plot
Slide 11: tracking efficiency
- Marzia: low pT cut-off is from the magnetic field and tracking curvature cut-off?
- Tony: inefficiency can come from seeding, and track matching. But silicon seeding is good thanks to Joe.
- Joe: tracking efficiency is low at low pT. Below 1GeV momentum scale is off from 1.0. It is even worse for the proton track as they were fit at a pion PID assumption.
Single pion efficiency at 0.5 GeV/c
- Marzia: suggest losing up constraint in pT matching
- Marzia: eta range is 1.1 instead of 1.5?
- Charles: the actual cut is 1.1 despite the label
- Tony: tracking will produce track beyond 1.1 with partial TPC coverage.
Discussion:
- Tony/Joe: second tracking stage with PID assumption. Refit is quick (1s / event).
- Xin: good to check vertex resolution to separate acceptance vs. efficiency effect e.g. with vertex distribution. One trick is to have an efficiency denominator
requiring minimal hit counts in MVTX, INTT, and TPC.
- Jin: beam effect (4D vertex + crossing angle) are built into the simulation by default
- Charles: will cross check
- Jin: test beam data linked on slides have a few differences in final sPHENIX TPC: gas changed from Ne->Ar based and radial thickness is different. Nonetheless,
we have real cosmic data to measure it from the real TPC now.
- Xin: STAR changed to most probable value a few years ago
- Low pT:
- Xin: pp low pT should be better, we should be able to more optimistic
- Tony: The number of events has little fluctuation and more stable tracking performance
Verbal update on exclusive B+ reconstruction: Zhaozhong Shi
Working on B+->Dpi channels in full simulation. To update later.
Jin: suggest moving to filtered Pythia simulation to allow for primary vertex-related topology study
______________________________
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, September 26, 2023 12:16 AM
To: 'Sphenix-upsilons-l AT lists.bnl.gov' <Sphenix-upsilons-l AT lists.bnl.gov>; 'sphenix-hf-Jets-l AT lists.bnl.gov' <sphenix-hf-jets-l AT lists.bnl.gov>
Cc: 'sphenix-physics-l AT lists.bnl.gov' <sphenix-physics-l AT lists.bnl.gov>
Subject: [reminder] Heavy Flavor/Quarkonium TG meeting Wed Sept 27 at 1:30PM ET
Dear all
Reminder of our joint Heavy Flavor/Quarkonium TG meeting
Wed Sept 27 at 1:30PM ET.
Currently on the agenda at https://indico.bnl.gov/event/20681/
we have:
• Introduction - Conveners
• Exploring proton ID for Lambda_c
- Charles Hughes
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
______________________________
