A radiative model with a naturally mild neutrino mass hierarchy

TL;DR

This paper introduces a radiative neutrino mass model extending the Standard Model with one heavy fermion and two scalars, naturally producing a neutrino mass hierarchy consistent with experimental observations without requiring additional flavor symmetries.

Contribution

The model predicts a realistic neutrino mass hierarchy using minimal extensions, avoiding the need for extra flavor symmetries.

Findings

Predicts neutrino mass hierarchy consistent with observations

Uses minimal extension of the Standard Model

Provides a natural explanation for the neutrino mass pattern

Abstract

Many neutrino mass models postulate the existence of at least two extra fermions in order to account for the measured solar and atmospheric mass splittings. In these models, however, the predicted hierarchy between the two mass splittings is generically much larger than the observed one, unless extra flavor symmetries are introduced. We present in this letter a radiative neutrino mass model consisting of the Standard Model extended by one heavy fermionic singlet and two scalars which predicts, under very general conditions, a neutrino mass hierarchy in qualitative agreement with the experimental value.