Abstract
Non-universal axion models, with the Peccei-Quinn (PQ) symmetry acting on Standard Model (SM) fermions in a generation-dependent way, are typically accompanied by two different sources of flavour violation, dubbed here as infrared (IR) and ultraviolet (UV). The former is due to the flavour violating axion couplings to SM fermions, while the latter arises from the heavy degrees of freedom that UV complete the axion effective field theory. We point out that these two sources of flavour violation are directly related and exemplify this connection in a general class of non-universal axion model, based on a renormalizable DFSZ-like setup with two Higgs doublets (PQ-2HDM). We next discuss the interplay of axion flavour phenomenology with the signatures stemming from the heavy radial modes of the PQ-2HDM, including meson oscillation observables and charged lepton flavour violating decays. We emphasize the strong complementarity between flavour observables, LHC direct searches and standard axion physics.
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Acknowledgments
We thank Mario Fernández Navarro, Belén Gavela, Luca Merlo and Robert Ziegler for useful discussions and comments. This work received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement N_ 860881-HIDDeN, grant agreement N_ 101086085-ASYMMETRY and by the INFN Iniziative Specifica APINE. The work of LDL is also supported by the project “CPV-Axion” under the Supporting TAlent in ReSearch@University of Padova (STARS@UNIPD).
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Di Luzio, L., Guerrera, A.W.M., Díaz, X.P. et al. On the IR/UV flavour connection in non-universal axion models. J. High Energ. Phys. 2023, 46 (2023). https://doi.org/10.1007/JHEP06(2023)046
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DOI: https://doi.org/10.1007/JHEP06(2023)046