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[Sphenix-physics-l] [minutes] bi-weekly Heavy Flavor Topical Group meeting

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>
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] bi-weekly Heavy Flavor Topical Group meeting
Date: Tue, 6 Apr 2021 08:58:52 +0000

Heavy Flavor Topical Group Meeting (2021/4/5)

https://indico.bnl.gov/event/11184/

Introduction - Jin

Due to the truth tracing issues, we need to use the archive

(ana.242).

Cameron: There is a pull request merged today, but this does

not yet fix the issues for the analyzers. There will be a

report at the simulation meeting tomorrow.

Sebastian: Can we use the latest KFParticle with ana.242?

Cameron: We need to build KFParticle independently, but

specifying one's own library did not work in condor.

Hideki: What is the recommended option for the time being?

Jin: (1) Use the default KFParticle in ana.242 or (2) wait for

the fixed version, which hopefully may arrive earlier than

a few weeks.

KFParticle and MDC1 - Cameron Dean

p.6:

Jin: One minor suggestion, but it is better to record the original

parton to discriminate the gluon splitting and b->c from the

prompt b or c. In general, saving all HepMC records is a

safe option.

Sebastian: Is there truth displacement information?

Jin: Yes, but we should be careful when referring to the HepMC

information. There is a different treatment in the generator

and Geant4: vertices relative to (0,0,0) or the collision vertex

and also the impact of the beam crossing angle.

Cameron: I will document that in a twiki, etc.

MDC1 update - Sebastian Tapia

p.5 and onwards:

Jin: The mass shift is also seen in the inclusive D0. Systematic

studies may be needed.

Cameron: I also saw the same shift (+6 MeV) in my studies.

Jin: We may need to rerun the Kalman Filter fitting.

p.10:

Jin: Did you use all the 50M events in your plots?

Sebastian: Yes.

Jin: It would be very useful to have the truth tracing here.

Hideki: Once the new fixed version is available, it would be nice

to see the same studies with the electron ID using the

calorimeter information.

General:

Jin: What is the acceptance efficiency of B ->K pi pi ?

Cameron: Fairly challenging to check from the HepMC and

track map, but a lot of tracks are missing being below

the pT threshold of 0.2 GeV.

Jin: There should also be visible impact from the rapidity

window. Can you extract the acceptance efficiency from the

HepMC and KFParticle?

Cameron: It may be possible by running two modules.

Jin: I want to know how many resonances are lost.

[Sphenix-physics-l] [minutes] bi-weekly Heavy Flavor Topical Group meeting, Hideki Okawa, 04/06/2021