A two-loop induced neutrino mass model, dark matter, and LFV processes $\ell_i \to \ell_j \gamma$, and $\mu e \to e e$ in a hidden local $U(1)$ symmetry

TL;DR

This paper proposes a two-loop induced neutrino mass model with a hidden $U(1)_X$ symmetry, linking neutrino mass, dark matter, and lepton flavor violation, and analyzes their phenomenological implications.

Contribution

It introduces a novel two-loop neutrino mass model with a hidden gauge symmetry, connecting neutrino mass generation to dark matter and lepton flavor violation.

Findings

Neutrino masses are generated at two-loop level with sizable Yukawa couplings.

The model predicts specific ratios for LFV processes consistent with experimental constraints.

Dark matter annihilation cross section is compatible with observed relic density.

Abstract

We discuss a model based on a hidden $U(1)_X$ gauge symmetry in which neutrino mass is induced at two-loop level by effects of interactions among particles in hidden sector and the Standard Model leptons. Since neutrino mass is suppressed by two-loop, its associate Yukawa couplings can be sizable and it would affect lepton flavor phenomenology. We analyze neutrino mass matrix, lepton flavor violating processes, electron/muon $g-2$ and dark matter annihilation cross section which are induced via interactions among Standard Model leptons and particles in $U(1)_X$ hidden sector, and their interactions can be sizable in our scenario. Performing numerical analysis, we show expected ratios for these processes using allowed parameters which can fit the neutrino data and satisfy flavor constraints.