  We calculate the energy dependence of the asymmetry in the cross sections for
circularly polarized photons on an unpolarized deuteron target in
$d\vec{\gamma} \to np$ in pionless effective field theory. By matching the
parity-violating low-energy constants to different sets of corresponding model
parameters we obtain estimates for the asymmetry. In addition we calculate two
possible figures of merit for the asymmetry in order to assess the preferred
photon energy at which to perform a possible future experiment at a
high-intensity photon source.
