A radiative seesaw model linking to XENON1T anomaly

TL;DR

This paper introduces a radiative seesaw model linking the XENON1T electron recoil excess to tiny neutrino masses, proposing a dark matter candidate that explains the anomaly through inelastic scattering and consistent with various experimental constraints.

Contribution

It presents a novel radiative seesaw model where dark matter inelastically interacts with electrons, connecting neutrino mass generation to the XENON1T anomaly.

Findings

Successfully explains XENON1T electron recoil excess

Maintains consistency with neutrino oscillation data

Satisfies constraints from relic density and lepton flavor violations

Abstract

We propose an attractive model that excess of electron recoil events around 1-5 keV reported by the XENON1T collaboration nicely links to the tiny neutrino masses based on a radiative seesaw scenario. Our dark matter(DM) is an isospin singlet inert boson that plays an role in generating non-vanishing neutrino mass at one-loop level, and this DM inelastically interacts with a pair of electrons at one-loop level that is required to explain the XENON1T anomaly. It is also demanded that the mass difference between an excited DM and DM has to be of the order keV. Interestingly, the small mass difference $\sim$keV is proportional to the neutrino masses. It suggests that we have double suppressions through the tiny mass difference and the one-loop effect. Then, we show some benchmark points to explain the XENON1T anomaly, satisfying all the constraints such as the event ratio of electrons of XENON1T, a long lived particle be longer than the age of Universe, and relic density in addition to the neutrino oscillation data and lepton flavor violations(LFVs).