See-Saw Masses for Quarks and Leptons in SU(5)

TL;DR

This paper integrates a see-saw mechanism for quark and lepton masses into an SU(5) grand unified theory, building on previous work with gauged flavor symmetries and anomaly-free fermions.

Contribution

It embeds heavy Dirac fermions into SU(5) multiplets, extending the see-saw mass generation mechanism within a grand unified framework.

Findings

Successful embedding of fermions into SU(5) multiplets

Implications for flavor symmetry breaking and anomaly cancellation

Potential new predictions for quark and lepton mass hierarchies

Abstract

We build on a recent paper by Grinstein, Redi and Villadoro, where a see-saw like mechanism for quark masses was derived in the context of spontaneously broken gauged flavour symmetries. The see-saw mechanism is induced by heavy Dirac fermions which are added to the Standard Model spectrum in order to render the flavour symmetries anomaly-free. In this letter we report on the embedding of these fermions into multiplets of an SU(5) grand unified theory and discuss a number of interesting consequences.