A model for trimaximal lepton mixing

Abstract

We consider trimaximal lepton mixing, defined by |U α2| 2 = 1/3∀α = e,μ,τ. This corresponds to a two-parameter lepton mixing matrix U. We present a model for the lepton sector in which trimaximal mixing is enforced by softly broken discrete symmetries; one version of the model is based on the group Δ(27). A salient feature of our model is that no vacuum alignment is required. © 2008 SISSA.