Neutrino Masses from Broken R-Parity

TL;DR

This paper reviews models with broken R-parity, showing how neutrinos gain mass at loop level and can achieve mixing angles suitable for explaining atmospheric and solar neutrino observations.

Contribution

It demonstrates that bilinear R-parity breaking models can generate realistic neutrino masses and mixings at one-loop level, addressing neutrino oscillation data.

Findings

At tree level, only one neutrino is massive.

Loop corrections give mass to all three neutrinos.

Models can produce bimaximal mixing compatible with neutrino experiments.

Abstract

We review models where R-parity is broken, either spontaneously or explicitly. In this last case we consider the situation where R-parity is broken via bilinear terms in the superpotential. We show that although at tree level only one neutrino gets mass, at one--loop level all three neutrinos became massive. We study the conditions under which bimaximal mixing can be achieved and show that the masses can be in the correct ranges needed for solving the atmospheric and solar neutrino problems.