Radiative Seesaw Mechanism for Charged Leptons

TL;DR

This paper proposes a radiative mechanism involving a dark sector to generate charged lepton masses at one loop, potentially explaining the muon g-2 anomaly and predicting deviations in Yukawa couplings testable at future colliders.

Contribution

It introduces a novel radiative seesaw model where charged lepton masses arise from dark sector particles, linking dark matter to lepton mass generation and muon g-2.

Findings

Muon and electron Yukawa couplings can significantly deviate from Standard Model predictions.

The model can account for the observed muon g-2 anomaly.

Deviations are testable at High-Luminosity LHC and future electron-positron colliders.

Abstract

We discuss a mechanism where charged lepton masses are derived from one-loop diagrams mediated by particles in a dark sector including a dark matter candidate. We focus on a scenario where the muon and electron masses are generated at one loop with new ${\cal O}(1)$ Yukawa couplings. The measured muon anomalous magnetic dipole moment, $(g-2)_\mu$, can be explained in this framework. As an important prediction, the muon and electron Yukawa couplings can largely deviate from their standard model predictions, and such deviations can be tested at High-Luminosity LHC and future $e^+e^-$ colliders.