On fermion mass hierarchy with extra dimensions

TL;DR

This paper proposes a model with extra dimensions where matter fields in the bulk and on the wall naturally reproduce fermion mass hierarchies and mixing angles, offering insights into neutrino masses and mixings.

Contribution

It introduces a realistic fermion mass hierarchy model with extra dimensions, avoiding the need for symmetry-based explanations.

Findings

Reproduces quark and lepton mass hierarchies

Explains mixing angles without symmetry arguments

Discusses neutrino mass and mixing possibilities

Abstract

Recently various phenomenological implications of the existence of extra space-time dimensions have been investigated. In this letter, we construct a model with realistic fermion mass hierarchy with (large) extra dimensions beyond the usual four dimensions. In this model, it is assumed that some matter fields live in the bulk and the others are confined on our four dimensional wall. It can naturally reproduce the quark and lepton mass hierarchy and mixing angles without any symmetry arguments. We also discuss some possibilities of obtaining suitable neutrino masses and mixings for the solar and atmospheric neutrino problems.