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[Sphenix-physics-l] [minutes] Joint HF/Quarkonium TG meeting May 18 9:30AM ET

From: Hideki Okawa <Hideki.Okawa AT cern.ch>
To: "sphenix-hf-jets-l AT lists.bnl.gov" <sphenix-hf-jets-l AT lists.bnl.gov>, "Sphenix-upsilons-l AT lists.bnl.gov" <Sphenix-upsilons-l AT lists.bnl.gov>
Cc: "sphenix-physics-l AT lists.bnl.gov" <sphenix-physics-l AT lists.bnl.gov>, "sphenix-maps-l AT lists.bnl.gov" <sphenix-maps-l AT lists.bnl.gov>
Subject: [Sphenix-physics-l] [minutes] Joint HF/Quarkonium TG meeting May 18 9:30AM ET
Date: Fri, 20 May 2022 16:11:25 +0000

Joint Heavy Flavor & Quarkonium Topical Group Meeting (2022/5/18)

https://indico.bnl.gov/event/15825/

Introduction

We are happy to welcome Cameron Dean as the incoming HF TG

co-convenor. Hideki will step down.

Vertex performance in MDC2 - Sanghoon Lim

p.2

Tony: There are 2 tracking modes in the Simple Vertex Finder:

(1) triggered mode (uses z match instead of crossing),

(2) pp mode (reconstruct all tracks in a crossing; not default)

Sanghoon's plots are with the triggered mode and look as

expected. The pp mode did not work well when CA seeder > 2us,

but it may be fixed now.

Wei: Do these include secondary vertices?

Tony: S.V.F. is not designed for secondary vertices, but we may

still see them if within a couple of microns of displacement.

p.4,5

Tony: Did you apply zero crossing cut here?

Sanghoon: Yes

p.5

Jin: The MDC2 inclusive jet samples have a truth filter with jet pT,

so please apply pT> 30 GeV to avoid the biased kinematic region.

Tony: What do secondary vertices in RAVE do?

Sanghoon: I used the multi-vertex mode in RAVE, but don't know

the exact condition.

Hideki: For the truth jet flavor, there are two categorizations: the

parton flavor and hadron flavor. We should consider the hadron

flavor, which is the standard in CMS and ATLAS.

Sanghoon: It takes to time to access truth information.

Tony: Where do you get the truth jet info?

Sanghoon: From the truth DST.

Tony: Ok, let's discuss offline.

Wei: What is the strategy for the pileup?

Tony: We will reconstruct all tracks/crossings within 7 us. The track

efficiency is pretty independent of the crossing.

D/Dbar separation & D+/Ds+ reconstruction - Thomas Marshall

Jin: Thanks for the cool results in time for the Computing Review.

p.8

Jin: Do you filter out non-phi?

Thomas: Right

Jin: OK, in such a case, we will loose ~70% of the signals (w/o phi).

Wei: How about you focus on training BDT for the phi decays first,

and then look for D+, Ds+ later.

Cameron: I've seen some people doing similar things. I will re-read

some notes and check whether there are issues with that approach.

EvtGen implementation (verbal updates) - Zhaozhong Shi

The latest EvtGen compiled fine, but it is not forcing events to decay

properly. Should have some updates at the next meeting.

[Sphenix-physics-l] [minutes] Joint HF/Quarkonium TG meeting May 18 9:30AM ET, Hideki Okawa, 05/20/2022