sPHENIX is a new detector at RHIC.

[Cheng-Wei Shih <cwshih0812 AT gmail.com>]

Dear sPHENIX Collaborators,

PPG-02 would like to announce the first collaboration circulation and review of the paper, targeted for submission to the Journal of High Energy Physics: “Measurement of Charged Hadron Multiplicity in Au+Au Collisions at 200 GeV with the sPHENIX Detector.”

The Invenio entry for the paper draft is: https://sphenix-invenio.sdcc.bnl.gov/records/aga48-gv870

The Invenio entry for the internal analysis note is: https://sphenix-invenio.sdcc.bnl.gov/records/ajtz6-bfe57

We note the following regarding the current results in the paper draft, which are marked in red and described in the footnotes:

- They were obtained using HIJING simulation samples with an older version of the MVTX geometry. The impact of different MVTX geometries is expected to be minimal.

- Two sources of systematic uncertainty have yet to be included: 1) variations due to different event generators/models, and 2) the uncertainty from secondary particles originating from weak decays. These uncertainties are not expected to be dominant compared to the existing ones, and their inclusion should not affect the key physics results or the main conclusions of the paper.

PPG will incorporate these remaining components once the centrality divisions for EPOS and AMPT are available and the analysis is fully processed with the requested simulation samples. PPG has coordinated with the IRC, conveners, and PCs, who have agreed to proceed with the first circulation based on the current status. The outstanding elements will be incorporated before the second circulation.

Best regards,

PPG-02 Analysis Team

IRC: Stefan Bathe (IRC Chair), Xiaochun He, Greg Ottino