Quark mixings as a test of a new symmetry of quark Yukawa couplings

Details Quark mixings as a test of a new symmetry of quark Yukawa couplings Quark mixings as a test of a new symmetry of quark Yukawa couplings

1997-03-11

arxiv.org/abs/hep-ph/9703292v1

Phys.Lett.B440:94-100,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX file, 10 pages including 1 table

Scientific paper

10.1016/S0370-2693(98)01077-6

Based on the hierarchy exhibited by quarks masses at low energies, we assume that Yukawa couplings of up and down quarks are related by $Y_u\propto Y_d^2$ 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 small asymmetry of the CKM matrix at low energies may be the effect of the renormalization group evolution only.

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