[Halld-physics] Abstract for upcoming DNP meeting

[Simon Taylor]

Hi, everyone.

I am planning to submit an abstract to the DNP meeting, appended below.  Comments are welcome.

Simon


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Status of the JLab Eta Factory (JEF) experiment

The JLab Eta Factory (JEF) experiment is designed to study various decays of
the eta meson using the GlueX detector in Hall D at Jefferson Lab.  The
experimental program includes measuring the Dalitz distribution from
eta->pi+pi-pi0 to determine the m_u/m_d quark mass ratio, looking for evidence
for new C-violating, P-conserving physics, providing input to higher-order chiral perturbation theory calculations, and searching for evidence of dark matter.
The latter two physics channels rely on measuring the rare eta -> pi0 gamma
gamma decay mode that will require an updgrade to the existing GlueX
equipment, which is a fixed target apparatus based on a 2-Tesla solenoidal
magnet.
Charged tracks are reconstructed using drift chambers within the magnet and
neutral particles are detected in the forward direction in the Forward Calorimeter (FCAL), an array of Lead Glass blocks.  The JEF program calls for replacing the ~80x80 cm^2 region of the FCAL around the beam line with an array of 2x2 cm^2 Lead Tungstate crystals.  The status of
this upgrade will be presented.


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