Universal Seesaw Mechanism with Universal Strength for Yukawa Couplings

Hypotheses of universal seesaw mechanism and universal strength for Yukawa couplings are applied to explain one possible origin of quasi-democratic mass matrices of special type in a left-right symmetric model with the gauge group $SU(3)_c\times SU(2)_L\times SU(2)_R\times U(1)$. Two kinds of Higgs doublets are postulated to mediate scalar interactions between $i$-th generation of light fermion doublets and $j$-th generation of heavy fermion singlets with relative Yukawa coupling constants of exponential form $e^{i\phi_{ij}}$, where $\phi_{ij}$ are real phase constants. The lowest seesaw approximation results effectively in self-adjoint mass matrices which are quasi-democratic and have same diagonal elements. A set of values for parameters $\phi_{ij}$ is found which reproduces well the present experimental data for the absolute values of the CKM matrix elements, the Jarlskog parameter and the Wolfenstein parameters.