Flavor Violating Lepton Family U(1)$_\lambda$

TL;DR

This paper introduces a minimal extension of the Standard Model with a new flavor-violating U(1) symmetry acting on leptons, explaining neutrino mixing and charged lepton flavor violation.

Contribution

It proposes an anomaly-free, family-dependent U(1)$_\lambda$ symmetry model that accounts for neutrino mixing angles and charged lepton mass hierarchies.

Findings

Predicts charged lepton flavor-violating processes mediated by a new gauge boson.

Justifies small neutrino mixing angle \theta_{13} via muon-tau mass ratio.

Explains electron-tau mass hierarchy.

Abstract

The Standard Model is extended minimally with a new flavor-violating family symmetry ${\rm U(1)}_\lambda$, which acts only on leptons including the right-handed neutrinos. The model is anomaly free with family-dependent ${\rm U(1)}_\lambda$ charges, and consistent with the observed neutrino mixing angles. It predicts charged lepton flavor-violating processes mediated by a new gauge boson. Under certain conditions, the smallness of $\theta_{13}$ of neutrino mixing can be justified in terms of the muon-to-tau mass ratio, at the same time explaining the electron-to-tau large mass hierarchy.