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[Sphenix-maps-l] [Minutes] bi-weekly heavy flavor topical group meeting

From: "Huang, Jin" <jhuang AT bnl.gov>
To: sphenix-hf-jets-l <sphenix-hf-jets-l AT lists.bnl.gov>
Cc: "sphenix-maps-l AT lists.bnl.gov" <sphenix-maps-l AT lists.bnl.gov>
Subject: [Sphenix-maps-l] [Minutes] bi-weekly heavy flavor topical group meeting
Date: Tue, 20 Oct 2020 02:58:16 +0000

We will continue the bi-weekly schedule with the next meeting on Nov 2nd, which is shifted by 1week due to the BNL holiday. Please let us know if it does not work for you.

Welcome - Hideki Okawa

AUM meeting coming!

https://indico.bnl.gov/event/9385/
Caroline Riedl for the plenary talk, Hideki Okawa for the HF parallel.

Join our chats online: https://wiki.bnl.gov/sPHENIX/index.php/Heavy_Flavor_Topical_Group#MatterMost_Chats Event plane detector ongoing: https://indico.bnl.gov/event/9870/

Martin: centered around an NSF proposal on EPD, but contributions would be welcomed.
Ming: concern about the material-thickness impact from inner detectors including the MVTX
Jin: Quantitative studies on-going. Expect hearing back from the team soon.

B_s update - Zhaozhong Shi

Many progress from the last update on the fast simulation setups

Zhaozhong: 40 tracks are selected with an arbitrary multiplicity of 40 tracks (20+ and 20- charged tracks)

Zhaozhong: Still need to implement initial quality cut, now has a loose cut on pT and DCA.

Slide 11+:

Jin: the new (red) curves are multipeaked and very suspicious. Suggest double check

Slide 20+:

Zhaozhong: Green curves are any B decay from the Pythia8 bbar process simulated events. (different from the label)

Slide 23:

Jin: green curve peak at very high SV-PV length which is very suspicous. Suggest double-check make sure not including long-decayed light hadrons.

Slide 29:

Hideki/Jin: Kaon rejection curves are representing a cut on EMCal E/p that 90% of true electrons survive the cut while 1/rejection fraction of Kaon also passes the cut and is misidentified as electrons.

Jin: Please also include the pion and proton in the hadron eID background studies.

Jin: the electron also has a low tail due to bremsstrahlung radiation, which should be considered in the next order of fast simulations.

Slide 34:

Jin: inclusive b-bbar events may contain phi->KK too, and therefore it would not be surprising that a phi peak shows up in the KK-candidate spectrum

KFParticle integration:

Jin: if the fast simulation output a set of SvtxTracks, then we can speed up the analysis with KFParticle following Cameron's work, i.e. replacing the Geant4 simulation + reconstruction steps with Zhaozhong's fast simulation code

Cameron: KFParticle module currently just need SvtxTracks in the input.

D0 program in pp collisions - Guanan Xie

SvtxVertexMapRefit is from offline vertexing:

https://github.com/sPHENIX-Collaboration/coresoftware/blob/master/offline/packages/trackreco/PHRaveVertexing.cc#L78

Slide 5:

MVTX matching efficiency is not optimal, with many tracks without MVTX matching in the current tracking software

Ming: would the poor matching efficiency relate to the small matching window?

Jin: tracking code tuned for high occupancy AuAu environment. Expect improvement in the future. Although it is a hard task.

Pythia8 tuning:

Long: Pythia8 tunes are either off HF yield or undershoot light hadron yield

Guannan: use the Jan-Workfest simulation sample in the current validation process. Will switch to the published spectrum for the fast sim. in the physical background study

Jin: still a tuned Pythia8 may be required to reproduce the correlated background

TODOs:

Jin will follow up offline on recalculating the DCA with respect to selected vertexes

Guannan: can we integrate KFparticle if fast simulation uses straight-line approximation and does not have the full covariance matrix?

Jin: to connect fast-sim code to KFParticle suggest only filling the diagonal terms in the covariance matrix as the fast sim is a quick and rough estimation of the performance

Cameron (on MatterMost): I just tested KFParticle where it only requires the diagonals of the covariance matrix, so just the uncorrelated parameter errors, and it seems to run.

______________________________

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: sPHENIX-HF-jets-l <sphenix-hf-jets-l-bounces AT lists.bnl.gov> On Behalf Of Huang, Jin
Sent: Sunday, October 18, 2020 12:03 PM
To: sphenix-hf-jets-l <sphenix-hf-jets-l AT lists.bnl.gov>
Cc: sphenix-maps-l AT lists.bnl.gov
Subject: [Sphenix-hf-jets-l] [Oct 19 Monday 7PM ET] bi-weekly heavy flavor topical group meeting

Hi Everyone,

This is a reminder that we will have our next HF topical group meeting on Oct 19 Monday 7PM ET. Please note the one-week shift due to a BNL holiday last Monday.

The agenda will include:

- B_s update : Zhaozhong Shi (MIT)

- D0 in p+p: Guannan Xie (LBNL)

Indico: https://indico.bnl.gov/event/9692/

Bluejeans connection: https://bluejeans.com/428810790

Besides the meeting announcement, if you would like to volunteer for any topic listed below or add any other one, please let us know.

https://wiki.bnl.gov/sPHENIX/index.php/Heavy_Flavor_Topical_Group#Study_plans

We look forward to talking to you all at the meeting.

Best regards,

Hideki & Jin

______________________________

Jin HUANG