[Halld-physics] Abstract for 2019 SESAPS meeting

[Simon Taylor]

Hello, everyone.
I am planning to submit an abstract to the upcoming SESAPS meeting (in November).  A draft is below -- comments are welcome.   I plan to submit at the end of this week.
Simon
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Status of the JLab Eta Factory (JEF) experiment

The JLab Eta Factory (JEF) experiment is an approved experiment in Hall D at
Jefferson Lab that focuses on decays of $\eta$ mesons with
emphasis on the rare $\eta\to\pi^0\gamma\gamma$ channel.  In addition to
providing a rare window into higher-order chiral perturbation theory, this
channel can be used to search for evidence of dark matter.   A potential
extension to the Standard
Model posits a dark gauge boson(``B'') that couples predominately with quarks
and can be observed in the $\eta\to\gamma B$, $B\to\pi^0\gamma$.   The same set
of final state particles can also be used to look for a scalar dark matter
mediator $S$ in the channel $\eta\to\pi^0S$, $S\to\gamma\gamma$.
In order to achieve the requisite
resolution to observe these rare channels, this experiment calls for an
upgrade to the existing GlueX equipment, which is a fixed target apparatus
based on a 2-Tesla solenoid magnet.  Neutral particles emerging after the
interaction of a photon beam with a liquid hydrogen target are detected in the
forward direction in the Forward Calorimeter (FCAL), an array of lead glass blocks.
We plan to replace the $\sim$80$\times$80 cm$^2$ region of the FCAL
closest to the beam line with an array of 2$\times$2$\times$20 cm$^3$ lead
tungstate crystals. The current status of the JEF project will be presented.
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