Family symmetries and alignment in multi-Higgs doublet models

TL;DR

This paper explores how family symmetries can justify Yukawa alignment in multi-Higgs doublet models, which suppresses flavor-changing neutral currents at tree level.

Contribution

It demonstrates that family symmetries can naturally lead to Yukawa alignment, offering a theoretical basis for flavor suppression in multi-Higgs models.

Findings

Family symmetries can enforce Yukawa alignment.

Yukawa alignment suppresses tree-level flavor-changing neutral currents.

The approach provides a symmetry-based justification for alignment.

Abstract

The exact alignment of the Yukawa structures on multi-Higgs doublet models provides cancellation of tree-level flavour changing couplings of neutral scalar fields. We show that family symmetries can provide a suitable justification for the Yukawa alignment.