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[Sphenix-physics-l] [minutes] Heavy Flavor/Quarkonium TG meeting Wed Nov 15 at 1:30PM ET

From: "Huang, Jin" <jhuang AT bnl.gov>
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: [Sphenix-physics-l] [minutes] Heavy Flavor/Quarkonium TG meeting Wed Nov 15 at 1:30PM ET
Date: Wed, 15 Nov 2023 20:11:38 +0000

D0 reco: Thomas Marshall

Cameron/Thomas: primary_vertex_z is a reconstructed vertex value that is different

Tony: curious about the truth vertex distribution. The reco histogram has a hard cut in the misalignment simulation. We can simulate a flat vertex distribution for a test too

Slide 3, D0 mass vs pT:

Thomas: uncertainty produced is from TProfile

Jin: invariant mass has a large tail, and a slice-by-slice Gaussian fit would be a better approach

Sdlie 17+:

Tony: MVTX is an important anchor of the track at the inner radius. Just the misalignment is not critical for that.

Tony/Jin: silicon misalignment will matter a lot on DCA and impact the D0 efficiency via decay topological cuts

Lambda-c reconstruction with TPC PID

Joe: truth reco map not existing?

Marzia: pT matching may be too tight

Marzia: a deeper look into the chi2 cut

Joe/Jin: The matched track appears to have much better Chi2, which is a survival bias

Tony: Chi2/ndof < 2 leads to a strange subset of tracks, suggesting relaxing to a higher value of 5-10

Jin: the peak at Chi2/ndof<1 is strange.

Cameron: no-matched track leads to Chi2/ndof ->0

Charles: these are reconstructed tracks. Need some investigation.

Peak shape:

Jin: The right side needs to be zoomed into the peak region to conclude the invariant mass resolution. On the left side, the pT-matched plot has a survival bias that rejects the tail. But the main resolution could be similar after zoom-in around the peak region.

Wei/Cameron: PID-mass is used in the resonance reconstruction

Jin: Proton-assumption in Kalman filter fit would be useful to get the best resolution, especially for low momentum proton (p<2 GeV)

Slide 21+

Charles: proton-track only is used in these efficiency studies

Zhaozhong: b-bar is included in the simulation sample so both prompt and non-prompt Lc are included in this study

Tony: efficiency has a strong vertex dependence.

______________________________

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, November 14, 2023 10:02 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 Nov 15 at 1:30PM ET

Dear all

Reminder of our joint Heavy Flavor/Quarkonium TG meeting Wed Nov 15 at 1:30PM ET.

Currently on the agenda at https://indico.bnl.gov/event/21228/ . The topics on agenda are

• D0 reconstruction at the presence of distortion and misalignment – Thomas Marshall
• 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

______________________________

[Sphenix-physics-l] [reminder] Heavy Flavor/Quarkonium TG meeting Wed Nov 15 at 1:30PM ET, Huang, Jin, 11/14/2023
- [Sphenix-physics-l] [minutes] Heavy Flavor/Quarkonium TG meeting Wed Nov 15 at 1:30PM ET, Huang, Jin, 11/15/2023