Sterile Neutrinos and B-L Symmetry

Abstract

We revisit the relation between the neutrino masses and the spontaneous breaking of the B-L gauge symmetry. We discuss the main scenarios for Dirac and Majorana neutrinos and point out two simple mechanisms for neutrino masses. In this context the neutrino masses can be generated either at tree level or at quantum level and one predicts the existence of very light sterile neutrinos with masses below the eV scale. The predictions for lepton number violating processes such as mu to e and mu to e gamma are discussed in detail. The impact from the cosmological constraints on the effective number of relativistic degree of freedom is investigated.

arXiv commentv2 new section for the LFV processes, minor corrections, main conclusion unchanged, version to appear in Physics Letters B

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Cited by in corpus (6)

• Minimal radiative Dirac neutrino mass models
• Simplest Radiative Dirac Neutrino Mass Models
• B-L Model with ${\mathbf{S}}_3$ Symmetry: Nearest Neighbor Interaction Textures and Broken $\mu \leftrightarrow \tau$ Symmetry
• Probing the Nature of Neutrinos with a New Force
• Automatic Nelson-Barr solutions to the strong CP puzzle
• Dirac neutrino mixings from hidden $\mu -\tau$ symmetry