sPHENIX discussion of physics

["Huang, Jin" <jhuang AT bnl.gov>]

Thanks Cameron for the immediate follow up!

 

Here is the minutes for tonight’s meeting (also attached to agenda)

 

Participants: Cameron Dean, Guannan Xie, Hideki Okawa, Jin Huang, Min Liu, Murad Sarsour, Sanghoon Lim, Weihu Ma, Xuan Li, Yasser C. Morales, Zhaozhong Shi

 

Introduction - conveners 

 

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

Look for volunteers on many studies, such as exploring HF correlations and HF-jet tagging updates. 

 

 

Verbal update on KFParticle analysis module - Cameron Deans (LANL)

Completing truth matching, clustering info, charge check on daughter combinations, adding track and vertex Chi2, push for instruction. TODO also includes cascading decay chain reconstruction. Expect an update in the coming meetings.

 

 

B_s - Zhaozhong Shi (MIT)

 

Slide 8: 

Jin: please double check the width fit value. In the plot, they look much better

Zhaozhong: will update the slides in place

 

 

Cameron Dean: Possible for J/Psi to mu + mu? 

Jin: no muon ID, but need to test whether we can clean up the signal with triple mass cut and decay topologies. 

Ming: pp/pA is more likely to get muons, via precision tracker decay/inv mass alone. 

Jin: with muons, there is no simple trigger detector. But we can explore with streaming readout. Need to quantify the muon background in pp

Ming: for signal simulation, we can try it out with dimuon channel with calorimeter simulations

Zhaozhong: will try 

 

Cameron: there is a p-wave component and induce distinct angular dependence. Does it affect acceptance efficiency given our statistics? 

Yasser: the dependence can be quite different for mid-rapidity detectors

Jin: let's quantify Acceptance*efficiency in pT-y binning. 

 

Jin: We currently use an old decayer [Pythia6] for HF decay simulations. What would be a reasonable decayer that could reflect the p-wave components in the B_s decay?

Cameron : suggest use EventGen , the current recommended model for Bs -> Jpsi phi decays is EvtPVVCPLH and is documented at https://evtgen.hepforge.org/doc/models.html

This model should account for the angular dependence on the decay products. A good example is in this note, https://cds.cern.ch/record/2644108/files/LHCb-PROC-2018-025.pdf in figures 1 and 3. I think this effect should be small at sPHENIX but maybe it is something to be considered.

 

Hideki: what is the loss in efficiency via the topological cut for background clean up? 

Zhaozhong: a few percents to 10% in the CMS analysis, which represents another major loss of statistics. Need to study for sPHENIX

 

 

 

 

 

______________________________

 

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: Cameron Thomas Dean <cameron.dean AT cern.ch>
Sent: Monday, July 20, 2020 8:23 PM
To: Huang, Jin <jhuang AT bnl.gov>
Cc: sphenix-hf-jets-l <sphenix-hf-jets-l AT lists.bnl.gov>; sphenix-physics-l AT lists.bnl.gov
Subject: Re: [Sphenix-physics-l] [July 20 Monday 7PM ET] bi-weekly heavy flavor topical group meeting

 

Hi all,

 

To follow up on Zhaozhong’s presentation, the current recommended model for Bs -> Jpsi phi decays is EvtPVVCPLH and is documented at https://evtgen.hepforge.org/doc/models.html

 

This model should account for the angular dependence on the decay products. A good example is in this note, https://cds.cern.ch/record/2644108/files/LHCb-PROC-2018-025.pdf in figures 1 and 3. I think this effect should be small at sPHENIX but maybe it is something to be considered.

 

Cheers,

Cameron

On 20 Jul 2020, at 15:27, Huang, Jin <jhuang AT bnl.gov> wrote:

 

Hi Everyone

 

This is a reminder for HF topical group meeting July 20 Monday 7PM ET.

 

Topics for today will be a brief introduction followed by B_s exploration by Zhaozhong Shi of MIT. Please find the agenda at https://indico.bnl.gov/event/8950/ and bluejeans coordinate: https://bluejeans.com/428810790

 

Looking forward to talking to you. 

 

Cheers

 

Jin

 

______________________________

 

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: Wednesday, July 15, 2020 12:24 PM
To: sphenix-hf-jets-l <sphenix-hf-jets-l AT lists.bnl.gov>
Cc: sphenix-l AT lists.bnl.gov
Subject: [July 20 Monday 7PM ET] bi-weekly heavy flavor topical group meeting

 

Hi Everyone

 

Thanks for voting for the HF topical group meetings! The best time slot is Monday 7PM ET, for one hour each meeting.

 

Therefore, we will schedule the next meeting at July 20 Monday 7PM ET. The agenda will be at

https://indico.bnl.gov/event/8950/

We will start the meeting with a HF TG status introduction, followed by the B_s hadronization study by Zhaozhong Shi. Topic suggestions for the future meetings will be welcomed too.

 

PS: future meeting announcement will be sent to sphenix-hf-jets-l AT lists.bnl.gov , please subscribe at https://lists.bnl.gov/mailman/listinfo/sphenix-hf-jets-l

 

Looking forward to talking to you.

 

Best regards

 

Hideki and Jin

 

 

 

______________________________

 

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: Monday, July 13, 2020 10:03 AM
To: sphenix-hf-jets-l <sphenix-hf-jets-l AT lists.bnl.gov>
Cc: sphenix-l AT lists.bnl.gov
Subject: RE: Doodle poll for bi-weekly heavy flavor topical group meetings

 

Hi Everyone

 

This is reminder of the doodle poll for the bi-weekly HF TG meetings:

 

[poll] https://doodle.com/poll/btaq2kgwpu3a6y2q

 

Thanks to many of us who already filed up the poll. We will pick a meeting time soon.

 

Cheers

 

Jin

 

 

______________________________

 

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: Thursday, July 9, 2020 11:12 AM
To: sphenix-hf-jets-l <sphenix-hf-jets-l AT lists.bnl.gov>
Cc: sphenix-l AT lists.bnl.gov
Subject: Doodle poll for bi-weekly heavy flavor topical group meetings

 

Dear Friends

 

As mentioned in the collaboration meeting report, we are planning the regular bi-weekly heavy flavor topical group meetings. It would be tricky to pick a slot cross time zones. Therefore, we will appreciate your input using the week of July 20-24 as a template. 

 

[poll] https://doodle.com/poll/btaq2kgwpu3a6y2q

 

We will announce the meeting time next week according to the results. We will also try to keep the meeting brief (<=1hr) with topics announced ahead of each meeting. Question and suggestions welcomed too.

 

For further announcement and discussion, please sign up with our email list:https://lists.bnl.gov/mailman/listinfo/sphenix-hf-jets-l . And for our on-going work and TODOs, please check out our wiki: https://wiki.bnl.gov/sPHENIX/index.php/Heavy_Flavor_Topical_Group  . Please also let us know if you are interested in looking into any of these studies or suggest new studies .

 

Cheers

 

Hideki and Jin

 

 

______________________________

 

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

______________________________

 

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