A light sterile neutrino from Friedberg-Lee symmetry
Journal
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Journal Volume
66
Journal Issue
7
Pages
68-72
Date Issued
2002
Author(s)
Wei Liao
Abstract
Light sterile neutrinos of mass about an eV with mixing Ũls of a few percent to active neutrinos may solve some anomalies shown in experimental data related to neutrino oscillation. How to have light sterile neutrinos is one of the theoretical problems which have attracted a lot of attentions. In this article we show that such an eV scale light sterile neutrino candidate can be obtained in a seesaw model in which the right-handed neutrinos satisfy a softly-broken Friedberg-Lee (FL) symmetry. In this model a right-handed neutrino is guaranteed by the FL symmetry to be light comparing with other two heavy right-handed neutrinos. It can be of eV scale when the FL symmetry is softly broken and can play the role of eV scale sterile neutrino needed for explaining the anomalies of experimental data. This model predicts that one of the active neutrino is massless. We find that this model prefers inverted hierarchy mass pattern of active neutrinos than normal hierarchy. An interesting consequence of this model is that realizing relatively large |Ũes | and relatively small |Ũμs | in this model naturally leads to a relatively small |Ũτs|. This interesting prediction can be tested in future atmospheric or solar neutrino experiments. © 2013 The Authors.
Type
journal article