[Primexd] [EXTERNAL] Re: [Halld-physics] QNP 2024

[Gan, Liping]

HI, Igal,

It is not a good idea to present a laundry list at an international conference. It would be better that you could focus on physics and the status of data analysis in general.  I would suggest making changes as the following:


A New Primakoff measurement of the η radiative decay width at JLab.

IGAL JAEGL ́E, on behalf of the GlueX Collaboration, Thomas Jefferson National Accelerator Facility

The properties of η reveal fundamental QCD symmetries at low-energies.  This meson is one of the Nambu--Goldstone bosons due to spontaneous breaking of the chiral symmetry by the QCD vacuum at the massless quark limit; and the decay of  η into two photons is mainly driven by the chiral anomaly. A precision measurement of the η-->2g decay width will offer determinations of the light quark-mass ratio and the η-η' mixing angle in model independent manners. There has been a longstanding discrepancy (~4σ) between the previous experimental results using Primakoff and e+e- collisions. The PrimEx-eta experiment is aimed at a new measurement via the  Primakoff effect to resolve this discrepancy.  A full statistical data was already collected at JLab through three different run periods in the past several years. The status of data analysis will be presented in this talk.


Best,

Liping


________________________________
From: Halld-physics <halld-physics-bounces at jlab.org> on behalf of gasparan--- via Halld-physics <halld-physics at jlab.org>
Sent: Tuesday, March 12, 2024 12:12 PM
To: Igal Jaegle <ijaegle at jlab.org>
Cc: halld-physics at jlab.org Physics <halld-physics at jlab.org>; primexd at jlab.org <primexd at jlab.org>
Subject: Re: [Halld-physics] QNP 2024

[This email originated from outside of UNCW]

 Hi Igal,
 It is a good idea to present our results in this very important Conference.
 I have two suggestions:
 1) it is better to have both "the GlueX" and "the PrimEx-eta"
    collaboration names in the beginning of the abstract. That would be
    better.
 2) somehow, when I read the abstract it gives me a negative impression
    about the experiment. The first part of the text is emphasizing our
    internal "problems" with this experiment a little more than it is
    needed (to me). Those problems are very typical for ALL Primakoff
    types of experiments. To solve those "problems" people designed
    experiments with: (a) better angular resolution, and (b) cleaner beam
    line for lesser background.
 3) I would not promise a "precise result". This is a not needed
    obligation at this time.

 The rest is very good and I support the article.
 Ashot


> All,
>
> Enclosed is my abstract for QNP2024. The deadline is March 15th. Your
> corrections/comments/remarks are welcome.
>
> tks ig.
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