Higgs Vacuum Stability in $B-L$ extended Standard Model

TL;DR

This paper investigates the vacuum stability of B-L extended Standard Models, showing how neutrino mass mechanisms and Higgs mixing influence the stability scale and providing constraints for supersymmetric versions.

Contribution

It analyzes the impact of neutrino mass generation and Higgs mixing on vacuum stability in B-L models, including supersymmetric cases, which was not thoroughly explored before.

Findings

Neutrino mass generation via inverse seesaw reduces stability scale to ~10^5 GeV.

Higgs mixing in non-supersymmetric B-L models helps improve vacuum stability.

Constraints for stabilizing Higgs potential in supersymmetric B-L models are provided.

Abstract

We study vacuum stability of B-L extension of the Standard Model (SM) and its supersymmetric version. We show that the generation of non-vanishing neutrino masses through TeV inverse seesaw mechanism leads to a cutoff scale of SM Higgs potential stability of order 10^5 GeV. However, in the non-supersymmetric B-L model, we find that the mixing between the SM-like Higgs and the B-L Higgs plays a crucial role in alleviating the vacuum stability problem. We also provide the constraints of stabilizing the Higgs potential in the supersymmetric B-L model.