Fermion Masses from Six Dimensions and Implications for Majorana Neutrinos

TL;DR

This paper explores how fermion masses and mixings can arise from wave function overlaps in a six-dimensional framework, predicting neutrino properties and mixing angles, including the size of θ13, with implications for experiments.

Contribution

It introduces a novel 6D model where fermion mass hierarchies and neutrino Majorana nature naturally emerge from wave function overlaps, predicting specific neutrino mass hierarchy and mixing angles.

Findings

Predicts inverted neutrino mass hierarchy

Foresees large leptonic mixing angles

Anticipates neutrinoless-double beta decay near experimental limits

Abstract

In these notes, we review the main results of our approach to fermion masses. The marge mass ratios between fermions, confronted with a unique breaking mechanism leading to vector bosons masses, led us to consider the possibility that they result from the overlap of fermion wave functions. Such overlaps vary indeed very strongly if the observed fermion families in 4 dimensions originate in a single family in 6 dimensions, through localized wave functions. This framework leads in a natural way to large mass ratios and small mixing angles between quarks. What came as a surprise is that if we impose that neutrinos behave as 2-component ("Majorana") particles in 4D, a completely different situation is obtained for them. Instead of diagonal mass matrices, anti-diagonal ones emerge and lead to a generic prediction of combined inverted hierarchy, large mixing angles in the leptonic sector, and a suppression of neutrinoless-double beta decay placing it at the lower limit of the inverted hierarchy branch, a challenging situation for on-going and planned experiments. Our approach predicted the size of the $\theta_{13}$ mixing angle before its actual measurement. Possible signals at colliders are only briefly evoked.