Abstract
The wealth of new data on neutrinos is easily incorporated in the Electroweak Theory. In this “ν-Standard Model”, lepton mixings are distinguished from quark mixings by a unitary matrix coming from the Seesaw. We catalog models in terms of the number of large angles (one or two) in that matrix. Pati-Salam unification implies Cabibbo effects in lepton mixings (MNS). Without such small mixings, the Solar and Atmospheric angles may well be the same, and the CHOOZ angle could vanish: in a wide class of flavor-symmetric models, it is of \U0001d4aa(λ/√2). We discuss a new approximate chiral family symmetry that preserves Froggat-Nielsen, and relates the 5-bar of the second and third families, but not the particles in the 10's. If exact, the electron and down quark are both massless and the atmospheric angle is maximal. We conclude by discussing possible Wolfenstein parametrizations of the MNS matrix, assuming various types of “Cabibbo Flops”.
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