Direct detection of mirror helium dark matter in the CRESST-III
  experiment
  Within the context of mirror dark matter, the dominant mass component of the
Milky Way dark halo consists of mirror helium ions. Mirror helium can interact
with ordinary matter if the kinetic mixing interaction exists. Mirror helium
being rather light, $m \simeq 3.73$ GeV, generally produces sub-keV recoils in
direct detection experiments. Recently, the CRESST-III experiment has began
probing the sub-keV recoil energy region and is currently the most sensitive
probe of such particles. We point out here that the small excess seen in the
low energy recoil data obtained in the CRESST-III experiment is consistent with
mirror helium scattering if the kinetic mixing parameter is around $\epsilon
\approx 5 \times 10^{-10}$. This kinetic mixing strength lies within the
estimated range favoured by small scale structure considerations.
