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Insensitive Unification of Gauge Couplings, Muon g-2 and Higgs Decays
The standard model extended by three complete vectorlike families features gauge coupling unification, sufficiently stable proton, and the Higgs quartic coupling remaining positive all the way to the grand unification (GUT) scale. Predicted values of gauge couplings at the EW scale are highly insensitive to fundamental parameters, and their ratios are mostly understood from the particle content. Possible mixing of vectorlike fermions with standard model fermions can contribute to a variety of processes. The deviation of the measured value of the muon anomalous magnetic moment from the standard model prediction can be completely explained. This explanation typically implies a significant modification of the decay rate of the Higgs boson to muon pairs. The decay rates of the Higgs boson to 4 leptons can also be significantly modified.
Sept 14 at 4pm in Geo/Phys 407
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