Abstract
CKM Unitarity in the Standard Model predicts |Vud|2 + |Vus|2 + |Vub|2 = 1. Experiments currently give 0.9999(6). The outstanding agreement constrains "new physics" effects at the tree and quantum loop level. Examples considered are: exotic muon decays, heavy quark or lepton mixing, high scale induced 4 fermion operators (e.g. excited W bosons from extra dimensions) and additional Z′ gauge bosons. Also, combining Kμ2 decays and CKM unitarity gives a charged Higgs mass bound mH± ≳ 5tan β GeV. Constraints from other precisely measured electroweak observables are also discussed.
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