Gauged flavour symmetry for the light generations

TL;DR

This paper explores a gauged SU(2)^3 flavour symmetry model for light quarks, showing it can evade many third-generation constraints and predicts distinctive collider signatures.

Contribution

It introduces a novel gauged SU(2)^3 flavour symmetry framework with a see-saw mechanism for light quark Yukawas, differing from previous SU(3)^3 models.

Findings

Most third-generation constraints can be evaded.

The model predicts characteristic collider signatures.

Heavy fermions are involved in Yukawa generation.

Abstract

We study the phenomenology of a model where an SU(2)^3 flavour symmetry acting on the first two generation quarks is gauged and Yukawa couplings for the light generations are generated by a see-saw mechanism involving heavy fermions needed to cancel flavour-gauge anomalies. We find that, in constrast to the SU(3)^3 case studied in the literature, most of the constraints related to the third generation, like electroweak precision bounds or B physics observables, can be evaded, while characteristic collider signatures are predicted.