[Jef] Abstract for "Workshop on BSM Physics at Eta-Factories"

[Alexander Somov]

Hi,

I am attaching a draft of the abstract for the upcoming workshop. Please let me know if you have any
comments/suggestions.

Thanks,
                 Sasha


The Jefferson Lab Eta Factory Experiment and Applications of PbWO₄ Calorimeters in Future
Experimental Facilities


The goal of the new JLab Eta Factory (JEF) experiment, conducted with the GlueX detector in Hall D at
Jefferson Lab, is to perform measurements of various  $\eta^{(\prime′)}$  decays with a primary focus
on rare neutral modes. The experiment's physics program  ranges from precision tests of low-energy QCD
to searches for gauge bosons with masses below 1 GeV that could couple the Standard Model (SM) sector
to the dark sector. The experiment will collect a high-statistics data sample of $\eta^{(\prime′)}$ mesons
produced via a beam of tagged photons. The GlueX detector features a large, nearly uniform acceptance for
both neutral and charged particles, enabling efficient identification of complex multi-particle final states.
To meet the requirements of the JEF experiment, the inner section of the forward lead-glass calorimeter in the
GlueX detector has been upgraded with lead tungstate (PbWO$_4$) scintillating crystals. PbWO$_4$ offers exceptional
characteristics, such as a small radiation length and Molière radius, and large light yield, that make it ideal
for constructing high-granularity, high-resolution, radiation-hard detectors. These properties enable excellent
spatial separation and energy resolution of reconstructed electromagnetic showers, establishing PbWO$_4$ as the
material of choice for many high-precision experiments. The JEF experiment began data collection in April 2025 and
will operate concurrently with the GlueX experiment, whose primary objective is the search for gluonic excitations
in the meson spectrum. I will give an overview of the JEF experiment, the GlueX detector, and the feasibility of further
upgrades to support future $\eta$ physics studies. Special attention will be given to the newly constructed PbWO$_4$
scintillating calorimeter and recent advancements in calorimeter instrumentation.



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