Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 8, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP08(2018)117
Keywords
Beyond Standard Model; Cosmology of Theories beyond the SM; CP violation; Global Symmetries
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Funding
- STFC Consolidated Grant [ST/L000296/1]
- European Union's Horizon 2020 Research and Innovation programme under Marie Sklodowska-Curie grant agreement Elusives ITN [674896]
- European Union's Horizon 2020 Research and Innovation programme under Marie Sklodowska-Curie grant agreement InvisiblesPlus RISE [690575]
- InvisiblesPlus RISE [690575]
- INFN Iniziativa Specifica TAsP-LNF
- STFC [ST/P000711/1] Funding Source: UKRI
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We present a comprehensive discussion of the phenomenology of flavourful axions, including both standard Peccei-Quinn (PQ) axions, associated with the solution to the strong CP problem, and non-standard axion-like particles (ALPs). We give the flavourful axion-fermion and axion-photon couplings and calculate the branching ratios of heavy meson (K, D, B) decays involving a flavourful axion. We also calculate the mixing between axions and heavy mesons K-0, D-0, B-0 and B-s(0), which affects the meson oscillation probability and mass difference. Mixing also contributes to meson decays into axions and axion decays into two photons, and may be relevant for ALPs. We discuss charged lepton flavour-violating decays involving final state axions of the form l(1) -> l(2)a (gamma), as well as mu -> eee and mu - e conversion. Finally we describe the phenomenology of a particular A to Z Pati-Salam model, in which PQ symmetry arises accidentally due to discrete flavour symmetry. Here all axion couplings are fixed by a fit to flavour data, leading to sharp predictions and correlations between flavour-dependent observables.
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