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Flavoured Warped Axion

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arxiv 2012.09728 v1 pith:KCDVKYEB submitted 2020-12-17 hep-ph hep-th

classification hep-phhep-th
keywords axionbulkcouplingsboundarydoubletsfermionflavourhiggs
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abstract

We consider a 5D extension of the DFSZ axion model that addresses both the axion quality and fermion mass hierarchy problems, and predicts flavour-dependent, off-diagonal axion-fermion couplings. The axion is part of a 5D complex scalar field charged under a U(1)$_{PQ}$ symmetry that is spontaneously broken in the bulk, and is insensitive to explicit PQ breaking on the UV boundary. Bulk Standard Model fermions interact with two Higgs doublets that can be localized on the UV boundary or propagate in the bulk to explain the fermion masses and mixings. When the Higgs doublets are localized on the UV boundary, they induce flavour diagonal couplings between the fermions and the axion. However, when the Higgs doublets propagate in the bulk, the overlap of the axion and fermion profiles generates flavour off-diagonal couplings. The effective scale of these off-diagonal couplings in both the quark and lepton sectors can be as small as $10^{11}$ GeV, and therefore will be probed in future precision flavour experiments.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Suppressing Extra-Dimensional Axion Isocurvature Dynamically

    hep-ph 2026-07 conditional novelty 6.0 of 10

    Radion dynamics in warped 5D models enhance the axion decay constant during inflation, satisfying CMB isocurvature bounds at higher Hubble scales while restoring the QCD window afterward.

  2. Extra-dimensional axion patterns

    hep-ph 2024-11 conditional novelty 6.0 of 10

    A bulk axion in flat or warped extra dimensions cannot produce displaced 'QCD maxion' patterns; only a canonical QCD axion plus a decoupled KK plateau survives the combined gravitational, unitarity, and astrophysical ...

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