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\Title{Rare Eta and Eta-prime Decay Program at Hall~D/Jefferson Lab}%
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      {\boldmath\footnote{Work supported by the Natural Sciences and
                          Engineering Research Council of Canada Grant SAPPJ-00023-2022.}}
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\presentingauthor{M. Thomson$^1$}%
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      {\footnote{\emph{E-mail:} mgt003@uregina.ca}}%
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\otherauthor{S. Ore\v{s}i\'c$^1$, Z. Papandreou$^1$, S. Taylor$^2$}
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\institution{$^1$Department of Physics, University of Regina, Regina, SK S4S 0A2}\\
\institution{$^2$Thomas Jefferson National Accelerator Facility, Newport News, Virginia, 23606, USA}
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Measurements of several rare $\eta$ and $\eta^{\prime}$ decay channels will be carried out with an upgraded GlueX detector in Hall~D as part of the Jefferson Lab Eta Factory (JEF) program. JEF will commence in late March 2025: the combination of highly-boosted  $\eta / \eta^{\prime}$ production, recoil proton detection, and a new fine-granularity high-resolution lead-tungstate insert in the GlueX forward calorimeter confers uniqueness to JEF, compared to other experiments worldwide. JEF will search for new sub-GeV gauge bosons in portals coupling the Standard Model sector to the Dark sector, will provide constraints on C-violating/P-conserving reactions, and will allow precision tests of low-energy QCD. Simulations have been driving methods towards significant background reduction and signal isolation for key rare decay channels: the $\gamma p \rightarrow \eta p$, $\eta \rightarrow \pi^+ \pi^- e^+ e^-$ channel will be shown as an example. Details on the hardware upgrade and initial look at the commissioning of the device will also be presented.


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