Quark and Lepton Flavor Mixings in the SU(5) Grand Unification Theory
arXiv:hep-ph/9811495 · doi:10.1016/S0550-3213(99)00049-8
Abstract
We explain the imbalance of the flavor mixing angles between the quark and the lepton sectors in the context of the SU(5) GUT with the see-saw mechanism. The quark masses and the CKM matrix elements are obtained by using, respectively, the Fritzsch and Branco - Silva-Marcos form for the up- and down-quark Yukawa matrices (y^u and y^d) at the GUT scale. The charged-lepton Yukawa matrix (y^e) is the transpose of y^d, modified by the Georgi-Jarlskog factor. We show that the neutrino masses and mixing angles suggested by the recent solar and atmospheric neutrinos are then obtained from a simple texture of the neutrino Yukawa matrix (y^ν) and a diagonal right-handed Majorana mass matrix at the GUT scale.
30 pages, no figure