Linear seesaw mechanism from dark sector

TL;DR

This paper introduces a minimal dark sector model that generates neutrino masses via a radiative linear seesaw mechanism, with potential observable lepton flavor violation and implications for dark matter and colliders.

Contribution

It presents a novel minimal model where a dark sector induces neutrino masses radiatively through a linear seesaw, with tree-level contributions suppressed by symmetry.

Findings

Neutrino masses are calculable and originate from spontaneous lepton number violation.

Lepton flavor violating processes like μ→eγ can be significant despite tiny neutrino masses.

The model has implications for dark matter and collider experiments.

Abstract

We propose a minimal model where a dark sector seeds neutrino mass generation radiatively within the linear seesaw mechanism. Neutrino masses are calculable, since tree-level contributions are forbidden by symmetry. They arise from spontaneous lepton number violation by a small Higgs triplet vacuum expectation value. Lepton flavour violating processes e.g. $\mu \to e\gamma$ can be sizeable, despite the tiny neutrino masses. We comment also on dark-matter and collider implications.