Bimaximal mixing from lopsided neutrinos

TL;DR

This paper explores how lopsided neutrino Yukawa couplings within type-I seesaw models can naturally produce the observed neutrino mixing angles, including a small |U_{e3}|, and discusses embedding in SO(10) models.

Contribution

It introduces a framework for generating neutrino mixing patterns from lopsided Yukawa couplings in hierarchical seesaw models, with potential embedding in SO(10) grand unified theories.

Findings

Lopsided neutrino Yukawa couplings can explain observed mixing angles.

Hierarchical neutrino mass spectrum consistent with data.

Embedding in SO(10) models is feasible.

Abstract

We consider the problem of neutrino masses and mixing within the general framework of standard (type-I) seesaw models leading to three light neutrinos. Under the assumption of a hierarchical neutrino mass spectrum \lambda^4: \lambda : 1, consistent with present data, we examine possible lopsided patterns for the neutrino Yukawa couplings that can account for the observed mixing angles, including a small but non-vanishing |U_{e3}|. An embedding of the above within a general class of SO(10) models is also considered.