English

Flavor hierarchies with nonminimal irreducible representations

High Energy Physics - Phenomenology 2026-05-20 v2

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 O(1)\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.

Keywords

Cite

@article{arxiv.2510.03403,
  title  = {Flavor hierarchies with nonminimal irreducible representations},
  author = {Hannah Banks and Graeme Crawford and Matthew McCullough and Dave Sutherland},
  journal= {arXiv preprint arXiv:2510.03403},
  year   = {2026}
}

Comments

5 pages + 4 pages appendices and references; v2: Matches journal version