sPHENIX is a new detector at RHIC.

[Yeonju Go <yeonju.go AT cern.ch>]

Dear all,

I have some minor comments on the sPHENIX BUP below:

- The first two paragraphs in Chapter 3.2 is duplicated in Chapter 4

- Figure 4.1 (right) is the same as Figure 3.1

- Missing info of yellow lines in Figure 4.2-4.4 (left)

- A typo in line 616: …, it is has been … 

- A typo in line 861: clean separation of the the v1 for D0 … 

- A typo in line 896: … selected high-multiplicity selected events … 

- A typo of xJg in caption of Figure 7.2 and in line 910 and 914

And I thought that maybe the low-pt direct photon (thermal photon) puzzle, which hydrodynamic models do not simultaneously describe the photon spectra and elliptic flow data, could be also studied in the 2026-2027 sPHENIX program. While the models predict the flow of hadrons quite well, the RHIC and LHC measurements for direct photon elliptic flow have been largely under-predicted by models so far. Measurements of flow coefficients of thermal photons (v1, v2, v3) in various collision systems can help us understanding the evolution of heavy ion collisions and QGP. 

Sincerely,

Yeonju Go

________________________________
From: sPHENIX-l <sphenix-l-bounces at lists.bnl.gov> on behalf of Jamie Nagle <jamie.nagle at colorado.edu>
Sent: Friday, August 21, 2020 3:13 PM
To: sphenix-l at lists.bnl.gov <sphenix-l at lists.bnl.gov>
Subject: [Sphenix-l] Draft sPHENIX Beam Use Proposal document for Collaboration Comment (comment deadline Tuesday, August 25, 2020)

Hello sPHENIXians,

As discussed at the sPHENIX Fortnightly Meeting today, the sPHENIX BUP Taskforce is sending around the draft BUP Document -- it is linked on Indico below.

https://indico.bnl.gov/event/9236/contributions/40706/attachments/30061/46923/sPHENIX_BUP_2020_draftrelease08212020.pdf

The document is essentially complete with a few places with red text to indicate that a figure needs updating or a reference is missing.    Comments by line number will be most appreciated.   The more constructive and specific the comments (i.e. feel free to suggest specific re-writing or specific figure changes), the better since time is short and we want to produce the best document we can.   There was a lot of good discussion about the option for pp running in Year-1 (2023).    Specific suggestions for how to reference or modify this discussion - currently in Chapter 5 on Commissioning - are most welcome.

Deadline for comments is close of business on Tuesday, August 25, 2020.    That gives the Taskforce sufficient time to take input seriously and improve the document before the submission deadline of August 31, 2020.
Comments can be sent directly as responses to this email on the list.   If you want to discuss some points in more detail in person, feel free to reach out to me or any of the Taskforce members

Sincerely,

Jamie, for the sPHENIX BUP Taskforce (Sasha Bazilevsky, John Haggerty, Jin Huang, Dennis Perepelitsa, ex-officio Dave Morrison, Gunther Roland)

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