Hierarchical Four-Neutrino Oscillations With a Decay Option

TL;DR

This paper proposes a comprehensive four-neutrino oscillation model including decay, synthesizing existing data and suggesting future experimental tests for the model's validity.

Contribution

It introduces a novel four-neutrino oscillation framework with decay, integrating all current data and exploring testable predictions.

Findings

Consistent explanation of neutrino disappearance and appearance data

Inclusion of neutrino decay into a Majoron as a novel aspect

Proposals for experimental verification of the decay scenario

Abstract

We present a new and novel synthesis of all existing neutrino data regarding the disappearance and appearance of $\nu_e$ and $\nu_\mu$. We assume four neutrinos: $\nu_e, \nu_\mu, \nu_\tau$, as well as a heavier singlet neutrino $\nu_s$ of a few eV. The latter may decay into a massless Goldstone boson (the singlet Majoron) and a linear combination of the doublet antineutrinos. We comment on how this scenario may be verified or falsified in future experiments.