Controlled fermion mixing and FCNCs in a 3+1 Higgs Doublet Model
arXiv:2102.05658 · doi:10.1007/JHEP05(2021)215
Abstract
We propose a 3+1 Higgs Doublet Model based on the family symmetry supplemented by several auxiliary cyclic symmetries leading to viable Yukawa textures for the Standard Model fermions, consistent with the observed pattern of fermion masses and mixings. The charged fermion mass hierarchy and the quark mixing pattern is generated by the spontaneous breaking of the discrete symmetries due to flavons that act as Froggatt-Nielsen fields. The tiny neutrino masses arise from a radiative seesaw mechanism at one loop level, thanks to a preserved discrete symmetry, which also leads to stable scalar and fermionic dark matter candidates. The leptonic sector features the predictive cobimaximal mixing pattern, consistent with the experimental data from neutrino oscillations. For the scenario of normal neutrino mass hierarchy, the model predicts an effective Majorana neutrino mass parameter in the range ~meV meV, which is within the declared range of sensitivity of modern experiments. The model predicts Flavour Changing Neutral Currents which constrain the model, for instance Kaon mixing and nuclear conversion processes, the latter which are found to be within the reach of the forthcoming experiments.
arXiv comment21 pages, 7 figures, version published in JHEP
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