The axion flavour connection

Abstract

A local flavour symmetry acting on the quarks of the Standard Model can automatically give rise to an accidental global $U(1)$ which remains preserved from sources of explicit breaking up to a large operator dimension, while it gets spontaneously broken together with the flavour symmetry. Such non-fundamental symmetries are often endowed with a mixed QCD anomaly, so that the strong CP problem is automatically solved via the axion mechanism. We illustrate the general features required to realise this scenario, and we discuss a simple construction based on the flavour group $SU(3)\times SU(2)\times U(1{)}_F$ to illustrate how mass hierarchies can arise while ensuring at the same time a high quality Peccei-Quinn symmetry.

11 pages, no figures

References in corpus (8)

• Flaxion: a minimal extension to solve puzzles in the standard model
• The Quest for an Intermediate-Scale Accidental Axion and Further ALPs
• A Holographic Perspective on the Axion Quality Problem
• Chiral models of composite axions and accidental Peccei-Quinn symmetry
• A Composite Axion from a Supersymmetric Product Group
• A natural and simple UV completion of the QCD axion model
• High Quality Axion in Supersymmetric Models
• Axion Quality Straight from the GUT

Cited by in corpus (1)

• Gauge $SU(2{)}_f$ flavour transfers