sPHENIX discussion of physics

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

Hello everyone

 

We had a productive dry run this morning. Yuanjing did a great job on the Lc study and in preparing the talk. It also leads to quite a few productive discussions regarding both the slides and the analysis note. Thanks to every contributed to the discussion, and the minutes are appended to this email below. We hope that Yuanjing has the slides updated soon, enjoy her talk, and have analysis note updated for the full collaboration review soon too.

 

Cheers

 

Xin and Jin

 

______________________________

Comments on the slides and analysis note:

 

Slide 2:

- Dave: we could mention, baseline detector does not have PID (TOF). We would add PID if there is new physics reach.

- Xin: limited PID.

- Jin: Not no PID, but no TOF detector in the baseline. Nonetheless, space is reserved, and there are collaborators looking into proposing a TOF for sPHENIX. And here we study its physics impact.

- Dave: Proposed experiment ->  sPHENIX is a planned experiment.

- Dave: small detector -> compact detector

- Dave: MVTX is based on ALICE ITS upgrade

 

Slide 3:

- Dave,1st bullet: focuses on physics message (understanding HF hadronization), rather than comparing to Pythia. Charm baryon -> heavy quark hadronization

- Dave: include a reference to Ralf's work, connecting to the opening talk in this session

- Xin : put a reference on the figure for STAR resolution point?

 

slide 4:

- Dave "Distance of closet approach" -> "Distance of closest approach"

- Dave: complexity in decay topology can be put as a useful feature for its identification

 

Slide 5:

- Dave : STAR DCA resolution -> 0.0035 cm @ 1 GeV

- Gunther: is there a reason to compare with HFT? we could put in the backup.

- Xin: could keep in mind

 

Slide 6:

- Many: as Lc in label is sum of Lc+ and \bar Lc-, we could use Lc/D^0, without "+" sign.

 

Slide 7:

- Dave: prepared to answer to describe where 240B events come from. (the Official run plan is 3 years, meanwhile, ALD ask collaboration to look into 5yr running. And 240B assumed full 5yr run plan).

- Gunther: put a run plan in the backup.

- Xin: Sample pT, eta,phi, -> use the measured particle spectra

 

Slide 8:

- Jin: Ideal TOF with pT limit

- Xin: Assuming STAR TOF -> assuming same performance as STAR TOF (scale both flight length and timing resolution)

- Ming: PID plot is from STAR?

- Xin: with 20ps resolution, we expect similar TOF performance.

- Ming: Does T0 needed?

- Xin: could use self-determination

 

Slide 9:

- Dave & Gunther: plots are busy and symbol is small. Connecting points could be helpful.

- Xin: Remove clean PID as not likely used, making the plot cleaner

- Dave: spacial diffusion coefficient defined at D(pT) @ pT ->0 GeV. Good to have x-axis to start from zero.

 

 

Slide 10:

- Xin/Dave: spend some time describing left panel

- Jin/Xin: could mention this is statistical uncertainty. Prepare an answer in systematic uncertainty

- Xin: STAR data point is statistical error only.

- Gunther: future talks could use more points between 2-4 GeV, there the stat. error jump suddenly

 

Summary slides:

- Dave: (without PID is already good) PID detector would extend reach to lower p_T.

- Gunther: prepare backup slides regarding PID detector. (space reserved for a PID detector between TPC & EMCal. Existing technology used to explore that space. Interested institution to explore this option. The study is still early, and a TOF detector not fully studied in sPHENIX in the simulation.)

 

 

______________________________

 

Jin HUANG

 

Associate Physicist

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

From: sPHENIX-physics-l <sphenix-physics-l-bounces AT lists.bnl.gov> On Behalf Of Xin Dong
Sent: Thursday, April 11, 2019 6:12 PM
To: sphenix-hf-jets-l AT lists.bnl.gov; sphenix-physics-l AT lists.bnl.gov
Cc: Yuanjing Ji <yuanjingji AT lbl.gov>
Subject: [Sphenix-physics-l] APS Talk Rehearsal - Yuanjing Ji: Friday 9:30-10:45am EDT

 

Dear Colleagues,

 

Yuanjing Ji is going to give a contributed (10+2 mins) presentation at the upcoming APS April meeting on Lambda_c simulation study with sPHENIX. We will schedule a dry run tomorrow for her at 9:30am EDT.

 

An indico page is created here and you can find the Bluejeans connection information there too.

https://indico.bnl.gov/event/6008/

 

Please join us when you are available to help her rehearsal. Thank you and Talk to you tomorrow.

 

Thanks and Best Regards

 

Jin and Xin (for HF-jet TG)

 

--

===========================
Xin Dong
Staff Scientist, Nuclear Science Division
Lawrence Berkeley National Laboratory
MS70R0319, One Cyclotron Road
Berkeley, CA 94720, USA
Tel: +1-510-486-4121
Email: XDong AT lbl.gov
===========================