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Flavourful axion phenomenology

Flavourful axion phenomenology
Flavourful axion phenomenology

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 K0, D0, B0 and Bs 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 ℓ1 → ℓ2a(γ), as well as μ → eee and μ − 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.

Beyond Standard Model, Cosmology of Theories beyond the SM, CP violation, Global Symmetries
1126-6708
1-32
Björkeroth, Fredrik
7ad4ebf0-2444-4e86-a7bb-baf017e8eff6
Chun, Eung Jin
f2a42410-3708-49df-9234-3f80a8ee5be2
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
Björkeroth, Fredrik
7ad4ebf0-2444-4e86-a7bb-baf017e8eff6
Chun, Eung Jin
f2a42410-3708-49df-9234-3f80a8ee5be2
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538

Björkeroth, Fredrik, Chun, Eung Jin and King, Stephen F. (2018) Flavourful axion phenomenology. The Journal of High Energy Physics, 2018 (117), 1-32. (doi:10.1007/JHEP08(2018)117).

Record type: Article

Abstract

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 K0, D0, B0 and Bs 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 ℓ1 → ℓ2a(γ), as well as μ → eee and μ − 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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Accepted/In Press date: 9 August 2018
e-pub ahead of print date: 21 August 2018
Published date: August 2018
Keywords: Beyond Standard Model, Cosmology of Theories beyond the SM, CP violation, Global Symmetries

Identifiers

Local EPrints ID: 424396
URI: https://eprints.soton.ac.uk/id/eprint/424396
ISSN: 1126-6708
PURE UUID: 00197a80-abf2-4199-a9b3-010ebcc9b47f

Catalogue record

Date deposited: 05 Oct 2018 11:36
Last modified: 13 Mar 2019 18:06

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Contributors

Author: Fredrik Björkeroth
Author: Eung Jin Chun
Author: Stephen F. King

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