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[Sphenix-physics-l] [minutes] Heavy Flavor/Quarkonium TG meeting Wed Jan 17 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 Jan 17 at 1:30PM ET
Date: Wed, 20 Mar 2024 19:05:34 +0000

HF Jet : Xuan Li

Jin: how 3D DCA calculated? Negative tail of b-jets is worrying

Xuan: from Jakub's code.

Cameron: provided 3D DCA chi2 to Jakub

Action item: we need to dig into the calculation of this variable before use. We will request a presentation about its definition and calculation in future meetings.

Cameron/Xuan: multiple B decay channels were combined to make the non-prompt plot

Cameron: cuts need to be studied

Cameron: only Kpi final states are included. There is no combinatorial background.

Cameron: slide 11, also check IP XY (2D IP)

Tony: 50um track IP is difficult to remove the background given the poor pp vertex resolution

Tony: background simulation is very difficult

Jin: it will be useful to have acceptance efficiency vs cut and vs decay length

Jin: it will be also useful to study vertex resolution (or lineshape) vs multiplicity

(post meeting convener discussion): add scan vs misalignment and distortion for non-prompt separation power

Upsilon with KFParticle: Andrew Clarke

Jin: definition of jT?

Zhongling: https://github.com/sPHENIX-Collaboration/coresoftware/blob/593730a820e418ea7e102863b7c85695580d6e7d/offline/packages/KFParticle_sPHENIX/KFParticle_Tools.cc#L809

Jin/Tony: that is the transverse component of electron momentum relative to the Upsilon momentum. Given most Upsilon has low momentum and decay spherically, this cut will hurt acceptance a lot.

Tony: the radiated electron is hard and probably not handled by KFParticle. Gaussian sum filter will handle it to an ex

Jin: performing HF electron simulation, which will show the true power of KFParticle to efficiently reject the non-prompt di-electron background

Tony: need vertex resolution study for B events.

______________________________

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, March 19, 2024 2:01 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 Jan 17 at 1:30PM ET

Dear all

Reminder of our joint Heavy Flavor/Quarkonium TG meeting Wed Mar 20 at 1:30PM ET.

Currently on the agenda at https://indico.bnl.gov/event/22762/ . The topics on agenda are

• HF Jet update - Xuan

• Upsilon in KFParticle - Andrew

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 Jan 17 at 1:30PM ET, Huang, Jin, 03/19/2024
- [Sphenix-physics-l] [minutes] Heavy Flavor/Quarkonium TG meeting Wed Jan 17 at 1:30PM ET, Huang, Jin, 03/20/2024