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) × SU(2) × U(1)F to illustrate how mass hierarchies can arise while ensuring at the same time a high quality Peccei-Quinn symmetry.
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Darmé, L., Nardi, E. & Smarra, C. The axion flavour connection. J. High Energ. Phys. 2023, 201 (2023). https://doi.org/10.1007/JHEP02(2023)201
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DOI: https://doi.org/10.1007/JHEP02(2023)201