A 4-neutrino model with a Higgs triplet

TL;DR

This paper proposes a 4-neutrino model incorporating a Higgs triplet and explicit lepton number violation, successfully explaining solar, atmospheric, and LSND neutrino oscillation data with natural mass spectra.

Contribution

It introduces a novel 4-neutrino framework with a Higgs triplet and lepton number violation, aligning with all current neutrino oscillation observations.

Findings

Reproduces favored 4-neutrino mass spectra

Explains solar neutrino problem via e9e9 transitions

Accounts for atmospheric neutrino oscillations with sterile neutrinos

Abstract

We take as a starting point the Gelmini -- Roncadelli model enlarged by a term with explicit lepton number violation in the Higgs potential and add a neutrino singlet field coupled via a scalar doublet to the usual leptons. This scenario allows us to take into account all three present indications in favour of neutrino oscillations provided by the solar, atmospheric and LSND neutrino oscillation experiments. Furthermore, it suggests a model which reproduces naturally one of the two 4-neutrino mass spectra favoured by the data. In this model the solar neutrino problem is solved by large mixing MSW \nu_e\to\nu_\tau transitions and the atmospheric neutrino problem by transitions of \nu_\mu into a sterile neutrino.