Lepton and Quark Mass Matrices

TL;DR

This paper introduces a unified zero texture model for quark and lepton mass matrices, analyzing their compatibility with experimental data and the implications of the seesaw mechanism.

Contribution

It proposes a common zero texture for all fermion mass matrices and clarifies which matrix types align with experimental observations, considering the seesaw mechanism.

Findings

Type I matrices fit quark data

Type II matrices can produce large neutrino mixing without seesaw

Seesaw mechanism makes Type I compatible with lepton data

Abstract

We propose a model that all quark and lepton mass matrices have the same zero texture. Namely their (1,1), (1,3) and (3,1) components are zeros. The mass matrices are classified into two types I and II. Type I is consistent with the experimental data in quark sector. For lepton sector, if seesaw mechanism is not used, Type II allows a large $\nu_\mu - \nu_\tau$ mixing angle. However, severe compatibility with all neutrino oscillation experiments forces us to use the seesaw mechanism. If we adopt the seesaw mechanism, it turns out that Type I instead of II can be consistent with experimental data in the lepton sector too.