  Recently, the XENON1T experiment has reported the possible detection of an
excess in the electronic recoil spectrum. Such an excess may indicate the
presence of new physics. In this work, we suggest that the scattering of mirror
electrons with ordinary electrons through photon$-$mirror photon kinetic mixing
with parameter $\epsilon \sim 10^{-12}(n_{\rm e'}/0.2{\rm
cm^{-3}})^{-1/2}({v_{\rm c}^0/5\times 10^{9}~{\rm cm~s^{-1}}})^{1/2}$ may
account for the excess electronic recoil events in XENON1T, where $n_{\rm e'}$
is the density of mirror electron and $v_{\rm c}^0$ is the cutoff velocity of
the mirror electron arriving at the earth. Interestingly, this parameter to
interpret the excess of XENON1T electronic recoil spectrum are consistent with
the constrains of Darkside50.

High Energy Physics - Phenomenology;High Energy Astrophysical Phenomena