PT Journal
AU Centelles Chulia, S
   Doring, C
   Rodejohann, W
   Saldana-Salazar, UJ
TI Natural axion model from flavour
SO Journal of High Energy Physics
JI J. High Energy Phys.
PY 2020
BP 137
EP 29pp
VL 09
IS 9
DI 10.1007/JHEP09(2020)137
LA English
DE Anomalies in Field and String Theories; Beyond Standard Model; Global Symmetries; Higgs Physics
AB 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.
ER