Neutrino Masses and Mixings Dynamically Generated by a Light Dark Sector

TL;DR

This paper links neutrino mass generation to a light dark sector with a new gauge symmetry, resulting in an anomaly-free inverse seesaw model where the $$-term is naturally generated, and potentially explains the MiniBooNE anomaly.

Contribution

It introduces a minimal, anomaly-free dark sector model that dynamically generates neutrino masses via an inverse seesaw mechanism with a naturally arising $$-term.

Findings

The model naturally produces the inverse seesaw Lagrangian.

The $$-term is dynamically generated and natural.

The light dark gauge boson may explain the MiniBooNE anomaly.

Abstract

Neutrinos may be the harbingers of new dark sectors, since the renormalizable neutrino portal allows for their interactions with hidden new physics. We propose here to use this fact to connect the generation of neutrino masses to a light dark sector, charged under a new $U(1)_{\cal D}$ dark gauge symmetry. We introduce the minimal number of dark fields to obtain an anomaly free theory with spontaneous breaking of the dark symmetry, and obtain automatically the inverse seesaw Lagrangian. In addition, the so-called $\mu$-term of the inverse seesaw is dynamically generated and technically natural in this framework. As a bonus, the new light dark gauge boson can provide a possible explanation to the MiniBooNE anomaly.