Constraining Flavour Symmetries At The EW Scale II: The Fermion Processes

TL;DR

This paper investigates models extending the Standard Model with an A4 flavour symmetry and multiple Higgs fields, highlighting how flavor-violating processes impose significant constraints on such theories.

Contribution

It analyzes the impact of flavor-violating processes in A4-symmetric models with multiple Higgses, emphasizing the importance of these constraints for model viability.

Findings

Flavor-violating channels are significantly constrained by the models.

Constraints can severely limit the parameter space of A4-based models.

New channels for flavor violation are identified and analyzed.

Abstract

We study the set of models in which the Standard Model symmetry is extended with the flavour group A4 and there are three copies of the Standard Model Higgs that transform as a triplet under this group. In this setup, new channels for flavour violating processes can be studied once the A4 representations of the fermions in the theory are given. We show that it is of great importance to take these constraints into account as they can put severe constraints on the viability of flavour models.