[Halld-physics] Abstract for Hadron2019

[Alexander Somov]

Dear Colleagues,


I am planning to attend the Hadron2019 conference which will take

place in China in August.  Below is a draft of an abstract. The deadline

for submission is tomorrow (April 30).


Comments are welcome.


Cheers,

       Sasha




Title: Eta Decay Program at GlueX


Abstract:

The GlueX detector in the experimental Hall D at Jefferson Lab
was designed to search for gluonic excitations in the spectra
of light mesons using photon beams. The detector provides a unique
capability to perform a precision measurement of the
$\eta \to \gamma \gamma$ decay width via the Primakoff effect
(PrimEx D experiment) and study rare decays of eta mesons.

Measurement of the eta decay width is essential for the determination
of fundamental properties such as the ratios of the light quark
masses and the  $\eta$−$\eta^\prime$ mixing angle, and will provide an
important test  of chiral symmetry breaking in QCD. The physics of rare
eta decays spans from critical tests of chiral perturbation
theory to the search for lepto-phobic dark matter candidates.

I will give an overview of the ongoing PrimEx D experiment and the
physics program of rare eta decays, and discuss GlueX plans for the future.