Mirror Dark Matter and Electronic Recoil Events in XENON1T

TL;DR

This paper proposes that mirror electron scattering via photon-mirror photon kinetic mixing could explain the electronic recoil excess observed in the XENON1T experiment, aligning with constraints from DarkSide50.

Contribution

It introduces a novel explanation for the XENON1T excess involving mirror dark matter and kinetic mixing, connecting experimental observations with theoretical models.

Findings

Mirror electron scattering can account for the XENON1T excess.

The kinetic mixing parameter is consistent with DarkSide50 constraints.

The model provides a plausible dark matter interaction mechanism.

Abstract

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.