Probing new physics signals with symmetry-restored Yukawa textures

Abstract

Abstract We implement a symmetry violation guideline into a two-Higgs-doublet model embedded with three right-handed neutrinos, and exploit the generic Yukawa structures of the model via a hypothetical symmetry restoration of a global $$U_Q(1)^3\times U_L(1)^3$$ UQ(1)3×UL(1)3 symmetry. We then apply a mass-powered parametrization to construct the phenomenologically motivated Yukawa interactions, which enables us to incorporate correlatively the neutrino mass, dark matter, as well as the lepton-flavor universality violations in $$R_{K^{(*)}}$$ RK(∗) and $$R_{D^{(*)}}$$ RD(∗) . Specifically, two atmospheric-scale neutrino masses are generated by a low-scale seesaw mechanism, while the much lighter one, being of $$\mathcal {O}(10^{-6})~{{\mathrm{eV}}}$$ O(10-6)eV , is fixed by a $$7.1~{\mathrm{keV}}$$ 7.1keV sterile neutrino dark matter produced primordially by the freeze-in mechanism. On the other hand, the neutrino and the charged-lepton mass hierarchies encoded in the mass-powered textures can naturally account for the $$R_{K^{(*)}}$$ RK(∗) and the $$R_{D^{(*)}}$$ RD(∗) anomalies, respectively. As a further application, a milder discrepancy of the muon $$g{-}2$$ g-2 is observed, which has also been implied by the recently refined lattice results.