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Journal Article

Natural axion model from flavour


Rodejohann,  Werner
Werner Rodejohann - ERC Starting Grant, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Centelles Chulia, S., Doering, C., Rodejohann, W., & Saldana-Salazar, U. J. (2020). Natural axion model from flavour. Journal of high energy physics: JHEP, 2020(9): 137. doi:10.1007/JHEP09(2020)137.

Cite as: https://hdl.handle.net/21.11116/0000-0008-24AB-F
We explore a common symmetrical origin for two long standing problems in particle physics: the strong CP and the fermion mass hierarchy problems. The Peccei-Quinn mechanism solves the former one with an anomalous global U(1)(PQ) symmetry. Here we investigate how this U(1)(PQ) could at the same time explain the fermion mass hierarchy. We work in the context of a four-Higgs-doublet model which explains all quark and charged fermion masses with natural, i.e. order 1, Yukawa couplings. Moreover, the axion of the model constitutes a viable dark matter candidate and neutrino masses are incorporated via the standard type-I seesaw mechanism. A simple extension of the model allows for Dirac neutrinos.