sPHENIX is a new detector at RHIC.

[Megan Connors <meganeconnors AT gmail.com>]

Dear all,

I am excited to share that I just sent the announcement below that we will be submitting ppg02 and ppg03 for publication in one week's time to RHIC leadership. Congratulations to all!!

Best,

-Megan

---------- Forwarded message ---------
From: Megan Elizabeth Connors <mconnors AT gsu.edu>
Date: Thu, Mar 27, 2025 at 3:41 PM
Subject: First sPHENIX papers ready for submission: "Measurement of the transverse energy density in Au+Au collisions at 200 GeV with the sPHENIX detector" and "Measurement of charged hadron multiplicity in Au+Au collisions at 200 GeV with the sPHENIX detector"
To: Frank Geurts <geurts AT rice.edu>, akiba AT bnl.gov <akiba AT bnl.gov>, Deshpande, Abhay <abhay AT bnl.gov>, Ruan, Lijuan <ruan AT bnl.gov>
Cc: Huang, Jin <jhuang AT bnl.gov>

Dear Abhay, Akiba-san, Frank, and Lijuan,

It is with great pleasure that we announce the sPHENIX collaboration's intention to submit our inaugural physics papers in approximately one week.

Target journal: PRC

Paper 1: "Measurement of the transverse energy density in Au+Au collisions at √s NN = 200 GeV with the sPHENIX detector"

Abstract: This paper reports measurements of the transverse energy per unit pseudorapidity (dET/dη) produced in Au+Au collisions at √sNN = 200 GeV, performed with the sPHENIX detector at the Relativistic Heavy Ion Collider (RHIC). The results cover the pseudorapidity range |η| < 1.1 and constitute the first such measurement performed using a hadronic calorimeter at RHIC. Measurements of dET/dη are presented for a range of centrality intervals and the average dET/dη as a function of the number of participating nucleons, Npart, is compared to a variety of Monte Carlo heavy-ion event generators. The results are in agreement with previous measurements at RHIC, and feature an improved granularity in η and improved precision in low-Npart events.

Target Journal: JHEP

Paper 2: 

"Measurement of charged hadron multiplicity in Au + Au collisions at  √s NN= 200 GeV with the sPHENIX detector"

The pseudorapidity distribution of charged hadrons produced in Au + Au collisions at a

center-of-mass energy of √s NN = 200 GeV is measured using data collected by the sPHENIX detector. Charged hadron yields are extracted by counting cluster pairs in the inner and outer layers of the Intermediate Silicon Tracker, with corrections applied for detector acceptance, reconstruction efficiency, combinatorial pairs, and contributions from secondary decays. The measured distributions cover |η| < 1.1 across various centralities, and the average pseudo-rapidity density of charged hadrons at mid-rapidity is compared to predictions from Monte Carlo heavy-ion event generators. This result, featuring full azimuthal coverage at mid-rapidity, is consistent with previous experimental measurements at the Relativistic Heavy Ion Collider, thereby supporting the broader sPHENIX physics program

Best regards,

Jin & Megan

*******************************

Dr. Megan E. Connors

She/her/hers

Associate Professor

Department of Physics and Astronomy

Georgia State University

********************************

GSU office: 455 Science Annex

GSU phone: 404-413-6143

BNL office: 2-217 Bldg 510

BNL phone: 631-344-2686