Semi-annihilating $Z_3$ Dark Matter for XENON1T Excess
  The recently reported result from XENON1T experiment indicates that there is
an excess with $3.5\sigma$ significance in the electronic recoil events.
Interpreted as new physics, new sources are needed to account for the
electronic scattering. We show that a dark fermion $\psi$ with mass about $
\mathcal{O}\left(10\right)$ MeV from semi-annihilation of $Z_3$ dark matter $X$
and subsequent decay of a dark gauge boson $V_\mu$ may be responsible for the
excess. The relevant semi-annihilation process is $X+X\rightarrow
\overline{X}+V_\mu (\rightarrow \psi + \overline{\psi})$, in which the final
$\psi$ has a box-shape energy spectrum. The fast-moving $\psi$ can scatter with
electron through an additional gauge boson that mixes with photon kinetically.
The shape of the signals in this model can be consistent with the observed
excess. The additional interaction with proton makes this model testable in
future searches for nucleus recoil as well. Because of the lightness of
invisible particle introduced, this scenario requires non-standard cosmology to
accommodate the additional radiation component.
