B-L Model with ${\bf S}_{3}$ Symmetry: Nearest Neighbor Interaction Textures and Broken $\mu\leftrightarrow\tau$ Symmetry

TL;DR

This paper extends the B-L gauge model with an S3 symmetry, explaining quark and neutrino mass hierarchies and mixing angles through NNI textures and broken mu-tau symmetry.

Contribution

It introduces a scalar extension of the B-L model with S3 symmetry, producing realistic quark and lepton mixing patterns and neutrino mass textures.

Findings

NNI textures in the quark sector reproduce CKM mixing.

Broken mu-tau symmetry yields non-maximal atmospheric angle.

Model accommodates observed neutrino mixing angles.

Abstract

We make a scalar extension of the B-L gauge model where the ${\bf S}_{3}$ non-abelian discrete group drives mainly the Yukawa sector. Motived by the large and small hierarchies among the quark and active neutrino masses respectively, the quark and lepton families are not treated on the same footing under the assignment of the discrete group. As a consequence, the Nearest Neighbor Interactions (NNI) textures appear in the quark sector, leading to the CKM mixing matrix, whereas in the lepton sector, a soft breaking of the $\mu \leftrightarrow \tau$ symmetry in the effective neutrino mass that comes from type I see-saw mechanism, provides a non-maximal atmospheric angle and a non-zero reactor angle.