Testing the Zee-Babu model via neutrino data, lepton flavour violation and direct searches at the LHC

TL;DR

This paper evaluates the testability of the Zee-Babu model using recent neutrino data, lepton flavor violation limits, and LHC searches, highlighting potential signals at upcoming collider runs.

Contribution

It provides an updated analysis of the Zee-Babu model incorporating recent experimental data and explores its testability at the LHC with specific signatures depending on neutrino hierarchy.

Findings

New scalars accessible at LHC Run 2

Distinct signatures based on neutrino hierarchy

Updated constraints from neutrino and collider data

Abstract

We discuss how the Zee-Babu model can be tested combining information from neutrino data, low-energy experiments and direct searches at the LHC. We update previous analysis in the light of the recent measurement of the neutrino mixing angle $\theta_{13}$, the new MEG limits on $\mu \rightarrow e \gamma$, the lower bounds on doubly-charged scalars coming from LHC data, and, of course, the discovery of a 125 GeV Higgs boson by ATLAS and CMS. In particular, we find that the new singly- and doubly-charged scalars are accessible at the second run of the LHC, yielding different signatures depending on the neutrino hierarchy and on the values of the phases. We also discuss in detail the stability of the potential.