paper

Dirac or Inverse Seesaw Neutrino Masses with Gauge Symmetry and Flavour Symmetry

arXiv:1411.5042 · doi:10.1016/j.physletb.2014.12.049

Abstract

Many studies have been made on extensions of the standard model with gauge symmetry. The addition of three singlet (right-handed) neutrinos renders it anomaly-free. It has always been assumed that the spontaneous breaking of is accomplished by a singlet scalar field carrying two units of charge. This results in a very natural implementation of the Majorana seesaw mechanism for neutrinos. However, there exists in fact another simple anomaly-free solution which allows Dirac or inverse seesaw neutrino masses. We show for the first time these new possibilities and discuss an application to neutrino mixing with flavour symmetry.

13 pages, Comments and References added, Conclusions Unchanged

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