Radiative neutrino mass generation and dark matter through vectorlike leptons

TL;DR

This paper introduces a three-loop radiative neutrino mass model involving vectorlike leptons and scalar doublets, which also provides dark matter candidates and aligns with current experimental constraints.

Contribution

It proposes a novel three-loop neutrino mass generation mechanism with asymmetric Yukawa couplings and explores its implications for dark matter and lepton flavor violation.

Findings

Model successfully explains neutrino masses and mixing.

Dark matter candidate consistent with phenomenological constraints.

Predictions for lepton flavor violation within experimental reach.

Abstract

This study presents a radiative three-loop model for neutrino mass generation, employing an asymmetric Yukawa coupling between two new scalar $SU(2)_L$ doublets and vectorlike lepton doublets. Dark matter candidates arise from one of the scalar doublets and contribute to neutrino mass generation through the mass splitting between its neutral components. The singly charged scalars are also essential for neutrino mass, with the charged states of the two doublets mixing with one another. A single generation of vectorlike leptons yields two nonzero neutrino masses as a consequence of the asymmetric Yukawa combinations entering the neutrino mass matrix. The model is tested against dark matter phenomenology, neutrino mass and mixing data, and the charged lepton flavor-violating process $\mu \rightarrow e \gamma$, showing compatibility with current bounds and leading to experimentally accessible predictions.