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Quark mixings as a test of a new symmetry of quark Yukawa couplings
1998
Physics Letters B
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Based on the hierarchy exhibited by quarks masses at low energies, we assume that Yukawa couplings of up and down quarks are related by Y_u∝ Y_d^2 at grand unification scales. This ansatz gives rise to a symmetrical CKM matrix at the grand unification (GU) scale. Using three specific models as illustrative examples for the evolution down to low energies, we obtain the entries and asymmetries of the CKM matrix which are in very good agreement with their measured values. This indicates that the
doi:10.1016/s0370-2693(98)01077-6
fatcat:73rbtnh7mvhdvkbqcaiuwujn4e