A Unified Description of Quark and Lepton Mass Matrices in a Universal Seesaw Model
Abstract
In the democratic universal seesaw model, the mass matrices are given by fL mL FR + FL mR fR + FL MF FR (f: quarks and leptons; F: hypothetical heavy fermions), mL and mR are universal for up- and down-fermions, and MF has a structure ( 1+ bf X) (bf is a flavour-dependent parameter, and X is a democratic matrix). The model can successfully explain the quark masses and CKM mixing parameters in terms of the charged lepton masses by adjusting only one parameter, bf. However, so far, the model has not been able to give the observed bimaximal mixing for the neutrino sector. In the present paper, we consider that MF in the quark sectors are still "fully" democratic, while MF in the lepton sectors are partially democratic. Then, the revised model can reasonably give a nearly bimaximal mixing without spoiling the previous success in the quark sectors.
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