Dynamical inverse seesaw mechanism as a simple benchmark for electroweak breaking and Higgs boson studies

TL;DR

This paper explores a dynamical inverse seesaw model where low-scale lepton number violation affects Higgs boson properties, vacuum stability, and collider signatures, providing a simple benchmark for electroweak symmetry breaking and Higgs studies.

Contribution

It introduces a minimal dynamical inverse seesaw framework linking neutrino mass generation with Higgs phenomenology and vacuum stability, offering a new benchmark for future collider investigations.

Findings

Higgs can decay invisibly into majorons at TeV scale

Vacuum stability constraints influence Higgs phenomenology

Model provides a simple testbed for electroweak symmetry breaking

Abstract

The Standard Model(SM) vacuum is unstable for the measured values of the top Yukawa coupling and Higgs mass. Here we study the issue of vacuum stability when neutrino masses are generated through spontaneous low-scale lepton number violation. In the simplest dynamical inverse seesaw, the SM Higgs has two siblings: a massive CP-even scalar plus a massless Nambu-Goldstone boson, called majoron. For TeV scale breaking of lepton number, Higgs bosons can have a sizeable decay into the invisible majorons. We examine the interplay and complementarity of vacuum stability and perturbativity restrictions, with collider constraints on visible and invisible Higgs boson decay channels. This simple framework may help guiding further studies, for example, at the proposed FCC facility.