sPHENIX cold QCD topical group

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

Minutes:

 

Christine – Rough outline of PAC presentation

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There was a lot of productive discussion regarding the outline for the PAC presentation, as well as ideas for the final LOI—thanks!

 

Should add overview of EIC physics measurements (inclusive, semi-inclusive, exclusive) at the beginning—don’t assume PAC will be familiar with the detection requirements, event multiplicities/topologies, etc. 

 

Suggestion to possibly restructure talk to group all detector performance plots and discussion together early on, then discuss impact on physics observables.  Will revisit once have more of the plots in place and examine length and balance of presentation.  Likely a fair amount of material included in the outline will need to be moved to backup, in particular given that now a several-slide introduction to EIC physics measurements will be added.

 

Should point out the reference sPHENIX design assumed for the studies.  NOT the descoped one!  Note that the decision not to use the descoped design as the starting point for the EIC detector studies was made in conjunction with sPHENIX management when the charge first came from Berndt.

 

p. 7 – Important to show can measure scattered electron for highest beam energy of 18 GeV, as this requires the most backward pseudorapidity coverage and is the most challenging.

 

p. 7 – Also need to show x-Q^2 coverage for the 4 different detector scenarios in this part of the talk.

 

Related to electron measurement – For final LOI, would be nice to study how big a difference it makes to have projective geometry for the EEMC.  Projective geometry was previously implemented in GEANT by a former Stony Brook student, similar to the geometry used by PANDA, but it’s not currently working in the simulation.  Need to identify someone to get this running again.

 

p. 8 – Would be nice to have a plot showing the impact of g1 measurements on Delta g (definitely for LOI if not for PAC talk).  Sasha will follow up to try to find code previously used for this by Kieran Boyle a number of years ago.

 

Hadron PID – Will create for internal use a table of momentum ranges and pseudorapidities where the different hadron species can be identified, to be applied to the generator-level studies.  Table will be added to information on LOI wiki page (https://wiki.bnl.gov/sPHENIX/index.php/EIC_SPHENIX_LOI_2018). 

 

Related to hadronic detection - For final LOI, include demonstration of Jacquet-Blondel method to reconstruct the event kinematics from the measured hadronic final state in charged-current events, where have unmeasured outgoing neutrino rather than scattered electron.

 

p. 10 – Also show reconstructed cluster separation in GEANT for DVCS electron and photon when they’re at high pseudorapidities.  Enrique will follow up.

 

p. 11 – Consider adding a reconstructed jet plot to the body of the talk.  Jinlong will follow up in conjunction with Abhay.

 

Relevant to jets – For final LOI, consider showing dijet measurement sensitive to gluon angular momentum.

 

p. 12 – Jin will provide one slide to present regarding reuse of the sPHENIX DAQ.  He has a few updates since he last presented in the Detector Study Group meeting.

 

 

Nils – EIC-sPHENIX in GEANT4/Fun4All

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Updated GEANT geometry and remaining GEANT volume conflicts discussed. 

 

It was decided to reduce the forward gas RICH length by 1 cm in order to resolve the volume conflict between the forward modular RICH (mRICH) and FEMCal—simplest solution.  The gas RICH simulation is in any case still only a parameterization, not nearly the level of detail of the mRICH implementation. 

 

There’s currently no implementation in GEANT at all of any extension to the Central EMCal.  Jin said it would be significant work to extend the coverage in GEANT at the same level of engineering design that the baseline sPHENIX Central EMCal simulation includes, and not straightforward in the code to “add on” less sophisticated modules to the edges of the current CEMC.  It was decided that for the EIC studies that need to include the recovered acceptance (scenario 1, with no gaps in EMCal coverage), the full CEMC would be replaced and extended by a longer cylindrical shashlik design in GEANT.  This will be much less sophisticated and not capture effects like tunneling between modules, but accurate energy and position resolution should be possible to implement.  Christine will follow up with Jin on how her group can implement this.

 

 

 

 

From: EIC-dsg-l <eic-dsg-l-bounces AT lists.bnl.gov> On Behalf Of Nils Feege
Sent: Monday, May 21, 2018 12:55 PM
To: sphenix-cold-qcd-l AT lists.bnl.gov; eic-dsg-l AT lists.bnl.gov
Subject: [EIC-dsg-l] EIC Detector Study Group / sPHENIX Cold QCD TG meeting TONIGHT at 8:30pm ET

 

Dear EIC and Cold QCD enthusiasts,

 

our next meeting is scheduled for TONIGHT

 

Monday, May 21st, 8:30pm ET.

 

This will be our last meeting before the PAC presentation (next Monday is Memorial Day). Christine will present an outline of the presentation that she is preparing so we can all give our input to shape the overall narrative. In addition, we will make a quick round through all the ongoing studies for this presentation to see where they stand.

 

The meeting is BlueJeans only (https://bluejeans.com/345777492) with the agenda evolving at https://indico.bnl.gov/event/4654/. If you would like to present slide, great! Please let us know and we will reserve a spot for you on the agenda.

 

Best,

Christine Aidala & Nils Feege

 

--

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