Residual flavor symmetries enforce simultaneously diagonal Yukawa couplings across all Higgs doublets when they fully control fermion mixing, yielding a generalized Yukawa Alignment that is free of tree-level FCNC.
Family symmetries and alignment in multi-Higgs doublet models
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abstract
The exact alignment of the Yukawa structures on multi-Higgs doublet models provides cancellation of tree-level flavour changing couplings of neutral scalar fields. We show that family symmetries can provide a suitable justification for the Yukawa alignment.
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FCNC-free multi-Higgs-doublet models from broken family symmetries
Residual flavor symmetries enforce simultaneously diagonal Yukawa couplings across all Higgs doublets when they fully control fermion mixing, yielding a generalized Yukawa Alignment that is free of tree-level FCNC.