In the conventional left-right gauge model, if Higgs scalar sector consists only of an SU(2)L doublet and SU(2)R doublet, fermion masses are zero at tree level. There have been many studies on how they would become massive. With help a dark with U(1)D symmetry, it is shown all standard-model fermions may acquire realistic radiatively, including that top quark. this context, particle content mod...

We compute the leading-logarithmic correction to neutrino mass matrix in Standard Model effective field theory (SMEFT) dimension seven. In limit of negligible lepton and down-type quark Yukawa couplings, it receives contributions from Weinberg dimension-five operator as well 11 dimension-six five dimension-seven independent interactions. Two main implications we derive this result are following...