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arXiv · 2510.03403

Flavor hierarchies with nonminimal irreducible representations

Hannah Banks·Graeme Crawford·Matthew McCullough·Dave Sutherland
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Abstract

We propose a new class of flavour models in which the spurion which breaks Standard Model flavour symmetries transforms in a non-minimal representation. Hierarchies in fermion masses, which arise from multiple insertions of this spurion, may be generated in a technically natural, accidental manner, from a handful of untuned $\mathcal{O}(1)$ elements in the UV. This relies explicitly on the non-Abelian nature of the symmetry, distinguishing it from standard Froggatt-Nielsen-like scenarios. The pattern of flavour violating operators at dimension-6 can radically differ from previously considered scenarios, and emphasises the need for a broad flavour programme across all generations.

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Hannah Banks, Graeme Crawford, Matthew McCullough, Dave Sutherland. 2025-10-03. Flavor hierarchies with nonminimal irreducible representations. https://doi.org/10.1103/9d53-lxp1

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