Froggatt-Nielsen ALP

Abstract

The Froggatt-Nielsen (FN) mechanism, a prominent framework for explaining the observed flavor hierarchies, generically predicts the existence of an axion-like particle (ALP). This work examines a class of FN models based on ${\mathbb{Z}}_N$ discrete symmetries. We chart the allowed parameter space from a set of theoretical considerations and construct explicit renormalizable completions with minimal field content necessary to generate consistent textures. We then conduct comprehensive phenomenological analyses of two particularly elegant ${\mathbb{Z}}_4$ and ${\mathbb{Z}}_8$ models, highlighting the interplay between the effects of the ALP and the associated UV fields. We find that the FN scale can be as low as a few TeV.

Comments: 33 pages + appendices, 7 figures. v2: corrected typos, matches the published version