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In the democratic universal seesaw model, the mass matrices are given by\bar{f}_L m_L F_R + \bar{F}_L m_R f_R + \bar{F}_L M_F F_R (f: quarks andleptons; F: hypothetical heavy fermions), m_L and m_R are universal for up- anddown-fermions, and M_F has a structure ({\bf 1}+ b_f X) (b_f is aflavour-dependent parameter, and X is a democratic matrix). The model cansuccessfully explain the quark masses and CKM mixing parameters in terms of thecharged lepton masses by adjusting only one parameter, b_f. However, so far,the model has not been able to give the observed bimaximal mixing for theneutrino sector. In the present paper, we consider that M_F in the quarksectors are still "fully" democratic, while M_F in the lepton sectors arepartially democratic. Then, the revised model can reasonably give a nearlybimaximal mixing without spoiling the previous success in the quark sectors.Comment: 7 pages, no figur

Unified description of quark and lepton mass matrices in a universal seesaw model