Inert Extension of the Zee-Babu Model

TL;DR

This paper introduces an extended Zee-Babu neutrino mass model at the TeV scale, incorporating a dark matter candidate and explaining muon g-2 anomalies through vector-like leptons, with testable LHC signatures.

Contribution

It presents a two-loop neutrino mass model with a dark matter candidate and explains muon g-2 via vector-like leptons, extending the original Zee-Babu model.

Findings

Vector-like leptons favored above 300 GeV by muon g-2 and LHC data.

Doubly-charged scalars decay into same-sign dileptons plus missing energy.

Model predicts detectable LHC signatures to distinguish it from others.

Abstract

We propose a two-loop induced Zee-Babu type neutrino mass model at the TeV scale. Although there is no dark matter candidate in the original Zee-Babu model, that is contained in our model by introducing an unbroken discrete $Z_2$ symmetry. The discrepancy between the experimental value of the muon anomalous magnetic moment (muon $g-2$) and its prediction in the standard model can be explained by contributions from additional vector-like charged-leptons which are necessary to give non-zero neutrino masses. The mass of vector-like leptons to be slightly above 300 GeV is favored and allowed from the muon $g-2$ and the current LHC data. We find that from the structure of neutrino mass matrix, doubly-charged scalar bosons in our model can mainly decay into the same-sign and same-flavour dilepton plus missing transverse momentum. By measuring an excess of these events at the LHC, our model can be distinguished from the other models including doubly-charged scalar bosons.