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 uand y d) and the GUT scale. The charge-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.
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