sPHENIX cold QCD topical group

["Aidala, Christine" <caidala AT bnl.gov>]

Minutes:

 

Jeongsu Bok – sPHENIX D^0 A_N simulation

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Range of predicted asymmetries quite large—magnitude could be as large as ~20% at xF ~ -0.1, which could be measurable with displaced vertex measurements even with more realistic efficiencies of O(10^-2).  D* could provide other options.  Hadronic decay channels?  In general need to keep trigger in mind.  Some D meson studies have been done for A+A in the Heavy Flavor Topical Group—will only be easier in p+p.

 

Considering that c-cbar produced together, trigger on electron on one side, then look for D^0 with displaced vertex on the other side?

 

Could probably access similar physics using bottom quark states—opens up new channels to consider. 

 

 

John Lajoie – Drell-Yan in the sPHENIX barrel

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Main question is how well hadronic backgrounds can be suppressed for e+e- in sPHENIX barrel.  Energy resolution of the EMCal already a potential concern (before worrying about HCal)—how good will E/p be?  Also looked at cuts involving IHCal energy—these would obviously be affected by possible descoping of IHCal.  So far looks like backgrounds still rather high—dominant bg from one pi0 Dalitz decay electron paired with a (misidentified) charged pion.  Loose DCA cut applied to check for tracks that look like they came from the collision vertex, not listed in the slides.

 

p. 7 – Track-level cut shown.  Note that cut on p. 7 would be applied for more global cuts shown on p. 6. 

 

p. 8 – Long tail on the left of the J/Psi due to bremsstrahlung. 

 

More studies will need to be done to see if the hadron bg can be reduced further.  All studies for p+p so far.  Considering a nuclear PDF measurement using D-Y in the barrel, will have higher multiplicities than when considered forward (p-going) D-Y in p+A for forward instrumentation LOI.  Will need to demonstrate that D-Y can be measured at midrapidity in p+p before looking into p+A.

 

 

From: sPHENIX-cold-QCD-l [mailto:sphenix-cold-qcd-l-bounces AT lists.bnl.gov] On Behalf Of Nils Feege
Sent: Friday, September 22, 2017 1:51 PM
To: sphenix-cold-qcd-l AT lists.bnl.gov
Subject: [Sphenix-cold-qcd-l] Next sPHENIX Cold QCD Meeting Monday 9/25 Evening at 8:30pm EDT

 

Dear Cold QCD enthusiasts,

 

our next meeting is scheduled for

 

Monday, September 25, 8:30pm EDT.

 

The meeting is BlueJeans only (https://bluejeans.com/345777492) with the agenda evolving at https://indico.bnl.gov/conferenceDisplay.py?confId=3658. Please let us know if you would like to present something.

 

We look forward to hearing you at the meeting.

 

Best,

Christine Aidala & Nils Feege

Co-conveners sPHENIX Cold QCD Topical Group

 

 

--

Dr. Nils Feege

Research Assistant Professor

 

SUNY at Stony Brook

Department of Physics & Astronomy

Stony Brook, NY 11794-3800

 

e-mail nils.feege AT stonybrook.edu

skype nils1920

phone +1-631-632-8710

 

www.linkedin.com/in/nilsfeege