sPHENIX Event Plane Detector discussion

["Perepelitsa, Dennis" <dvp AT bnl.gov>]

Hi Ejiro and all,

Thanks for the question, let me check this. 

The “few author” subsystem papers are an agreed upon exception to the publication policies. For the TPOT paper ( https://arxiv.org/pdf/2403.13789 ) we de facto approved a number of technical plots that went into that paper. I would think that’s perfectly fine for the sEPD as well, although we may want to have a conversation with the Collaboration ahead of time about the plots that are really directly showing our physics capabilities (e.g. the EP resolution, etc.)

Why don’t we reach out to the SPs and maybe ask for a small slot in the GM or PCM later in the Spring, as the paper gets closer to completion and we start to see the full scope of what we want to show?

Dennis

On Feb 10, 2025, at 1:42 PM, Ejiro Umaka <ejironaomiumaka AT gmail.com> wrote:

Hi Anders,

I added a few sections to the paper that include sEPD cosmic testing, and performance in Au+Au collisions at 200 GeV. I'll fill in the words in the coming days.

I don't know if we need to get approval for plots we add to paper.

A cosmic testing plot is already public:  https://www.sphenix.bnl.gov/sites/default/files/2024-03/sphenix-perf-8-23-QM2023FinalPlot_sEPDcosmics.pdf

There was testing with a Strontium source: https://www.sphenix.bnl.gov/sites/default/files/2024-03/sphenix-perf-8-23-QM2023FinalPlot_sEPDSr90Test.pdf

Event plane performance plots in Au+Au at 200 GeV : https://drive.google.com/drive/folders/1ORJNVFCmgV9BR-zK5y2-aDk035nhxCd0?usp=sharing

Dennis, can you comment if we need to get the sEPD event plane performance plots approved before adding it to the paper?

Thanks,

Ejiro

On Mon, Feb 3, 2025 at 8:33 AM Anders Knospe <sphenix-sepd-l AT lists.bnl.gov> wrote:

Hi, everybody. I wanted to check in regarding the sEPD paper. I see that a significant amount of text, plus two figures, about the electronics have been added. I believe that was Eric's doing, but in any case, a shout-out to whomever added that material!

That's great progress, but there is still a lot to be done. Some major items are:
1.) We need to put actual numbers into the Design and Construction sections. I was hoping Tristan might be able to do that. But if somebody could point me to the relevant drawings and documents, I would be happy to go through and put in the numbers myself.
2.) We need to fill in the "information on machining". I feel like this needs to be one paragraph. Could Rosi or Tristan do this, or could we invite our machinist to say a few words?
3.) We need to fill in the Testing section. I forget exactly who we were thinking would do this. I think it might have been Ejiro and/or Dan, but I didn't write anything down. Is somebody willing to take this on?
4.) There are several figures that we need to have made: "placement in sPHENIX", "overview of whole sEPD", "detail of 1 sector", "detail of 1 tile", "side view of 1 tile". I would be willing to be the point person on this, but I actually have no idea whom I need to talk to in order to make this happen. Any suggestions?
5.) We also need an estimate on what kinds of performance plots we can reasonably expect in the next few months, and when they should be ready. I wrote down "event-plane resolution" and "centrality determination". If I remember correctly, Ejiro is working on some of this. It would be good to hear from anybody who is coordinating sEPD performance work so we can get an idea of what results are in the pipeline and who is working on them.

Please note that the clock is ticking. If I understand correctly, our final report is due to the NSF some time in the summer, and it would be very good to have the paper on the arXiv by then. That will mean working steadily on this paper throughout the spring. I think that most of us would benefit from having another publication we can point to, given how much time we have invested in this detector.

So, could you please take a moment to respond to this email and let the group know your thoughts? Thanks!

P.S. If you need to be added to the overleaf project as a collaborator, please let me know.

--

Anders Knospe

Frank Hook Assistant Professor
Department of Physics
Lehigh University
16 Memorial Drive East
Bethlehem, PA 18015, USA

Chair, RHIC/AGS Users' Executive Committee

Office: 412 Lewis Lab
Phone: +1 610 758 6431 (86431 on campus)
Pronouns: he

Dennis V. Perepelitsa
Associate Professor, Physics Department
University of Colorado Boulder