# Flavon-induced lepton flavour violation

## TL;DR

This paper explores how a flavon field from the Froggatt-Nielsen mechanism can induce lepton flavor violation in Higgs decays, potentially explaining the observed h→μτ decay while satisfying experimental constraints.

## Contribution

It proposes a model where the flavon field causes Higgs flavor violation, linking it to the Froggatt-Nielsen mechanism and analyzing its parameter space against experimental bounds.

## Key findings

- A significant parameter space allows large h→μτ branching ratios.
- The model remains consistent with existing charged lepton flavor violation bounds.
- Flavon-induced mixing can explain Higgs flavor-violating decays.

## Abstract

ATLAS and CMS have observed a flavor violating decay of the Higgs to muon and tau. The fact that flavour violating couplings of the Higgs boson are exactly zero in the Standard Model suggests the mixing of the Higgs with another scalar with flavour violating couplings. We use the flavon field from the Froggatt-Nielsen mechanism, responsible for generating the lepton Yukawa matrices, for this purpose. The parameter space is constrained from experimental bounds on charged lepton flavor violation in other processes, however, we show that a substantial region of parameter space survives these bounds while producing a large enough $Br(h \to\mu\tau)$.