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Froggatt-Nielsen ALP
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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.
Forward citations
Cited by 5 Pith papers
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ALP production in Lepton Flavour Violating meson, tau and gauge boson decays
ALPs with LFV couplings above the muon mass threshold can be produced in LFV meson, tau, and gauge boson decays, yielding clean eμ signatures that enable new searches at future experiments.
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Positivity and partial wave unitarity bounds on ALP theories via amplitude methods
Complete partial-wave unitarity and positivity bounds are derived for ALP effective interactions up to dimension 8, with new SMEFT positivity constraints as a byproduct.
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Flavor at FASER: Discovering Light Scalars Beyond Minimal Flavor Violation
Flavored scalar models with a Froggatt-Nielsen symmetry make D-meson decays a major production source for long-lived scalars at FASER/FASER2, with reach presented model-independently in branching fraction and lifetime...
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A comprehensive study of ALPs from $B$-decays
The paper derives the complete two-loop flavor-changing coupling of axion-like particles to b and s quarks and uses it to set updated limits on f_a in KSVZ, DFSZ and Flaxion models.
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Renormalization of effective field theories via on-shell methods: the case of axion-like particles
Complete one-loop anomalous dimension matrix for a CP-violating ALP effective field theory, derived via on-shell unitarity methods and extended to dimension-6 SMEFT operators.
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