Lepton number violation phenomenology of d=7 neutrino mass models

TL;DR

This paper explores the phenomenology of d=7 neutrino mass models involving new particles, predicting observable lepton number violating signals at the LHC, and analyzes current constraints and future search prospects.

Contribution

It introduces a class of d=7 1-loop neutrino mass models with rich LHC phenomenology and discusses their experimental signatures and constraints.

Findings

Models can fit observed neutrino masses and mixings.

Certain LNV final states have observable branching ratios.

Current constraints limit some model parameters.

Abstract

We study the phenomenology of d=7 1-loop neutrino mass models. All models in this particular class require the existence of several new $SU(2)_L$ multiplets, both scalar and fermionic, and thus predict a rich phenomenology at the LHC. The observed neutrino masses and mixings can easily be fitted in these models. Interestingly, despite the smallness of the observed neutrino masses, some particular lepton number violating (LNV) final states can arise with observable branching ratios. These LNV final states consists of leptons and gauge bosons with high multiplicities, such as 4l+4W, 6l+2W, etc. We study current constraints on these models from upper bounds on charged lepton flavour violating decays, existing lepton number conserving searches at the LHC and discuss possible future LNV searches.