Non-standard neutrino interactions in the Zee-Babu model

TL;DR

This paper explores the potential size and observability of non-standard neutrino interactions within the Zee-Babu model, considering experimental constraints and the implications for future experiments and collider searches.

Contribution

It provides a comprehensive analysis of NSIs in the Zee-Babu model, linking collider physics, neutrino oscillations, and low-energy experiments.

Findings

NSIs could be observable at future neutrino factories.

Inverted hierarchy enhances the detectability of NSIs.

LHC searches for doubly charged scalars are relevant for NSI predictions.

Abstract

We investigate non-standard neutrino interactions (NSIs) in the Zee--Babu model. The size of NSIs predicted by this model is obtained from a full scan over the parameter space, taking into account constraints from low-energy experiments such as searches for lepton flavor violation (LFV) and the requirement to obtain a viable neutrino mass matrix. The dependence on the scale of new physics as well as on the type of the neutrino mass hierarchy is discussed. We find that NSIs at the source of a future neutrino factory may be at an observable level in the nu_e to nu_tau and/or nu_mu to nu_tau channels. In particular, if the doubly charged scalar of the model has a mass in reach of the LHC and if the neutrino mass hierarchy is inverted, a highly predictive scenario is obtained with observable signals at the LHC, in upcoming neutrino oscillation experiments, in LFV processes, and for NSIs at a neutrino factory.