Dynamical scoto-seesaw mechanism with gauged $B-L$

TL;DR

This paper introduces a new dynamical mechanism linking dark matter and neutrino masses through a gauged B-L symmetry, explaining the solar and atmospheric neutrino scales with testable collider and lepton flavor violation signals.

Contribution

It presents a novel dynamical scoto-seesaw model with gauged B-L symmetry that unifies dark matter stability and neutrino mass generation in a consistent framework.

Findings

The model explains solar and atmospheric neutrino mass scales.

It predicts observable charged lepton flavor violation phenomena.

Dark matter stability is ensured by residual matter parity.

Abstract

We propose a dynamical scoto-seesaw mechanism using a gauged $B-L$ symmetry. Dark matter is reconciled with neutrino mass generation, in such a way that the atmospheric scale arises \textit{a la seesaw}, while the solar scale is \textit{scotogenic}, arising radiatively from the exchange of ``dark'' states. This way we ``explain'' the solar-to-atmospheric scale ratio. The TeV-scale seesaw mediator and the two dark fermions carry different $B-L$ charges. Dark matter stability follows from the residual matter parity that survives $B-L$ breaking. Besides having collider tests, the model implies sizeable charged lepton flavour violating (cLFV) phenomena, including Goldstone boson emission processes.