Democratic Seesaw Mass Matrix Model and New Physics
Yoshio Koide
Abstract
A seesaw mass matrix model is reviewed as a unification model of quark and lepton mass matrices. The model can understand why top-quark mass mt is so singularly enhanced compared with other quark masses, especially, why mt >> mb in contrast to mu = O(md), and why only top-quark mass is of the order of the electroweak scale LambdaW, i.e., mt = O(LambdaW). The model predicts the fourth up-quark t' with a mass mt'= O(mWR), and an abnormal structure of the right-handed up-quark mixing matrix URu. Possible new physics is discussed.
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