sPHENIX discussion of physics

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

Also available on agenda: https://indico.bnl.gov/conferenceDisplay.py?confId=3018

 

 

Announcements - Xin, Jin

 

As MVTX proposal and reviews being planned in the coming months, we plan to make the HF topical group meeting regular, about once a month. While regular simulation tasks is updated in the simulation meetings, we will use the topical group meetings to provide a platform to discuss the HF physics @ sPHENIX and status in review preparation.

 

Plans updated on wiki: https://wiki.bnl.gov/sPHENIX/index.php/Heavy_Flavor_Topical_Group#Planning

 

Next TG meeting about one month later. Will use doodle to select for new monthly time.

 

 

Project news - Ming Liu

 

Slide 2: Now MVTX detector is a standalone project from sPHENIX that enables the sPHENIX HF program

Ming: Nevertheless, our intention is to install MVTX on day-one of sPHENIX

 

Slide 4: lots of update on MVTX Readout R&D, C&S, and integration with rest of tracker system

 

Slide 5: Updated key dates:

• Late June,  sPHENIX/MVTX review  dry run
• Early July for BNL director review

·       Aug/Sept: Updated proposal after director's review

 

 

Status of Physics Case Preparation - Xin, Jin

 

Slide 2-3: generic physics and review of D-meson world data

Slide 4: updated physics plot time lines

 

Jin: sPHENIX SP is iterating updating with CAD on luminosity projections. We should follow the final projection to update uncertainties in the end

Jin: we hope also incorporate correlation measurements (d-b-jets and Non-prompt-D-b-jet) with model curves for the proposal too.

 

Slide 5-6: task list and status from last meeting.

 

Given high time pressure, volunteers are welcomed. Also we have a wish list of studies that looking for volunteers too : https://wiki.bnl.gov/sPHENIX/index.php/Heavy_Flavor_Topical_Group#Planning  

 

 

Comparison of MVTX projections with Models - Cesar da Silva

 

Summary: extracted b-jet cross section and production channel to be used by Ivan’s group for b-jet RAA predictions @ sPHENIX

 

Additional request: it will be great to also add curves for di-b-jet projections, B-meson-b-jet and Non-prompt-D-meson-b-jet projections.

 

Slide 4: simulation output

Jin: We expect lower fraction of B (10% or so) from gluon splitting. Is the “gluon”- labelled events also include flavor excitation?  

Cesar: Yes. And will work with Ivan’s group on using consistent definition for the massive-gluon channel in Ivan's calculation.

 

Xin: can we go to lower pT than 15 GeV/c?

Cesar/Jin: probably the current simulation from Darren used 10 GeV q^hat in pythia8, which we should avoid lower the observed jet pT to be close to 10 GeV/c.

  

 

Open-b x-section requirement- Tony Frawley

 

Summary: new Industrial standard for Upsilon comparison is open HF x-section instead of p+p, which avoids problems of nPDF uncertainties. We should consider add open b-x-sec measurement to sPHENIX. Expect total error of 10%.

 

Tony: Considering B->J/Psi down to pT below 1GeV/c, require additional electron ID.

Xin: STAR achieved dE/dx ~7% in TPC. For non-prompt-D0 -> piK, it is challenging to go to low pT (<2GeV) without PID.

 

Xin: LBNL also plans to look into exclusive B-channel to help address full x-section.

 

 

Updated B-meson projection - Xiaolong Chen

 

Summary: rerun D-meson simulation for updated tracking macros and centrality ranges. Projection for R_AA and v2 updated.

 

Xiaolong: should we rerun full embedded Geant4 simulation with ladder geometry?

Jin/Tony: we probably want to wait until the new pattern recognition software to be ready.

Haiwang: testing the new Kalman-based patter recognition software + ladder geometry. Performance similar to ideal pattern recognition.

 

Jin: with 2GeV/c non-prompt-D pT cut, what is the corresponding x-section for the parent B-meson?  

Xiaolong/Xin: FONNL show non-prompt-D with pT>1 GeV -> 75% total cross section. pT>2GeV/c cut leads to 1/3 of cross section. After Au_Au suppression, it may be even smaller. Very hard to constraint to 10% level with a non-prompt-D pT>2GeV/c cut.

 

 

Non-prompt-D b-jet correlations - Xuan Li

 

Summary: establishing non-prompt-D and b-jet correlation for sPHENIX

 

Xin: how the pi + K pairs were selected and simulated?

Xuan: Pythia8 truth simulation with truth tracing to a D-meson

 

Xin: What was the Pythia8 setting?

Xuan: hard QCD, inclusive b-production

 

Xin: angular correlation observables will be very interesting too. Collision energy loss will leads to a widen \Delta Phi

Xuan : good point!

 

Plan: Communicate off line on using LBNL fast simulation package for D-background estimation. Verify fast simulation package with full Geant4 simulation in case of correlated background.  

 

 

 

 

 

______________________________

 

Jin HUANG

 

Associate Physicist

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

 

> -----Original Message-----

> From: sPHENIX-HF-jets-l [mailto:sphenix-hf-jets-l-bounces AT lists.bnl.gov] On

> Behalf Of Huang, Jin

> Sent: Tuesday, April 11, 2017 2:49 PM

> To: sphenix-hf-jets-l AT lists.bnl.gov; sphenix-maps-l <sphenix-maps-

> l AT lists.bnl.gov>

> Cc: sphenix-physics-l AT lists.bnl.gov

> Subject: [Sphenix-hf-jets-l] [reminder] heavy flavor topical group meeting,

> Wed Apr 12, 2-4 PM EST, @ 2-219

>

> Hello everyone,

>

> This is reminder to heavy flavor topical group meeting, Wed Apr 12, 2-4 PM

> EST, @ 2-219.

>

> In this meeting, we will get updates on the MVTX project, discuss physics case

> preparation, and topical updates on theory curves, open-b x-section, and

> projections on inclusive B-meson and B-meson-b-jet correlations.

>

> The agenda page is at

> https://indico.bnl.gov/conferenceDisplay.py?confId=3018 , for which the

> common modification password is "1008"

> *         For residents at BNL, we will meet at the 2-219 conference room if

> not closed for snow

> *         To join the Meeting via phone bridge:

> https://bluejeans.com/891109017

> *         To join via Phone:

> 1) Dial:

>         +1.408.740.7256

>         +1.888.240.2560(US Toll Free)

>         +1.408.317.9253(Alternate number)

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> 2) Enter Conference ID: 891109017

>

> Looking forward to talking to you tomorrow.

>

>

> Cheers,

>

> Xin, Jin, Ming

>

> ______________________________

>

> Jin HUANG

>

> Associate Physicist

> Brookhaven National Laboratory

> Physics Department, Bldg 510 C

> Upton, NY 11973-5000

>

> Office: 631-344-5898

> Cell:   757-604-9946

> ______________________________

>

>

> > -----Original Message-----

> > From: sPHENIX-HF-jets-l

> > [mailto:sphenix-hf-jets-l-bounces AT lists.bnl.gov] On Behalf Of Huang,

> > Jin

> > Sent: Monday, April 3, 2017 10:33 AM

> > To: sphenix-hf-jets-l AT lists.bnl.gov; sphenix-maps-l <sphenix-maps-

> > l AT lists.bnl.gov>

> > Cc: sphenix-physics-l AT lists.bnl.gov

> > Subject: [Sphenix-hf-jets-l] [poll] heavy flaor topical group meeting

> >

> > Hello everyone

> >

> > Following the last brain storming meeting, we are organizing a HF-jet

> > topical group meeting in the next week or so, with the aims of reviewing

> our status.

> > Please indicate your availability in the following doodle poll before

> > EOB of

> > Wed:

> >

> > http://doodle.com/poll/sbrifsvxyz5v9f4p

> >

> > The tentative agenda is

> > * MVTX project status - Ming

> > * Review/discussion of scientific case for MVTX - Xin/Jin

> > * Open b-production cross section in Au+Au for the Upsilon program -

> > jointly with Tony/Mariza

> > * Topical summaries:

> > ** Model update for inclusive R_AA and correlations - Cesar

> > ** Non-prompt-D update - Xiaolong

> > ** Non-prompt-D-b-jet correlation - Xuan

> > ** di-b-jet correlation - Darren / Haiwang We plan for two hours total.

> > Suggestions are welcomed.

> >

> > As the consortium prepare for the MVTX proposal, we also plan to have

> > the TG meeting about once a month in the future and invite talks from

> > external speakers. Looking forward to talking to you soon.

> >

> > Best regards,

> >

> > Xin, Jin, Ming

> >

> >

> > ______________________________

> >

> > Jin HUANG

> >

> > Associate Physicist

> > Brookhaven National Laboratory

> > Physics Department, Bldg 510 C

> > Upton, NY 11973-5000

> >

> > Office: 631-344-5898

> > Cell:   757-604-9946

> > ______________________________

> >

> >

> > _______________________________________________

> > sPHENIX-HF-jets-l mailing list

> > sPHENIX-HF-jets-l AT lists.bnl.gov

> > https://lists.bnl.gov/mailman/listinfo/sphenix-hf-jets-l

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