The simplest scoto-seesaw model: WIMP dark matter phenomenology and Higgs vacuum stability

TL;DR

This paper investigates a minimal scoto-seesaw model that links neutrino masses, dark matter, and Higgs vacuum stability, providing a unified framework consistent with current experimental constraints.

Contribution

It introduces the simplest scoto-seesaw model combining neutrino oscillation, dark matter phenomenology, and vacuum stability analysis with two-loop RGEs.

Findings

Parameter regions compatible with dark matter relic density and detection limits.

Vacuum stability bounds derived from two-loop RGEs.

Lower bound on neutrinoless double beta decay amplitude.

Abstract

We analyze the consistency of electroweak breaking, neutrino and dark matter phenomenology within the simplest scoto-seesaw model. By adding the minimal dark sector to the simplest "missing partner" type-I seesaw one has a physical picture for the neutrino oscillation lengths: the "atmospheric" mass scale arises from the tree-level seesaw, while the "solar" scale is induced radiatively, mediated by the dark sector. We identify parameter regions consistent with theoretical constraints, as well as dark matter relic abundance and direct detection searches. Using two-loop renormalization group equations we explore the stability of the vacuum and the consistency of the underlying dark parity symmetry. One also has a lower bound for the neutrinoless double beta decay amplitude.