Model of quark and lepton mixing and mass hierarchy

It is shown that an idea proposed in 1996 that relates in a qualitatively correct way the interfamily mass hierarchies of the up quarks, down quarks, charged leptons, and neutrinos, can be combined with a predictive scheme recently proposed for relating quark mixing and neutrino mixing. In the resulting model, the entire flavor structure of the quarks and leptons is expressible in terms of two "master matrices": a diagonal matrix that gives the interfamily mass ratios, and an off-diagonal matrix that controls all flavor mixing.