A PHENOMENOLOGICAL THEORY OF FERMION MASSES AND MIXINGS

A phenomenological theory of fermion masses and mixings is constructed within the framework of a four-family symmetry. It is found that the most favored set of relevant CKM elements are \V(us)\ almost-equal-to 0.222, \V(cb)\ almost-equal-to 0.044, \V(ub)/V(cb)\ almost-equal-to 0. 082, \V(ud)\ almost-equal-to 0.974, \V(cs)\ almost-equal-to 0.9736, \V (cd)\ almost-equal-to 0.224 with B(K) almost-equal-to 0.8. The top qua rk mass is predicted to be 258 GeV at 1 GeV with its physical mass app roximately in the range of 153 GeV to 165 GeV. Some remarks on the rel ationship between the lepton sector and the quark sector will be made.