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Abstract:
We present an in-depth analysis of a recently proposed Standard Model extension with a complete fourth generation of quarks and leptons, which are vectorlike with respect to the Standard Model gauge group and charged under a new spontaneously broken vectorlike U(1)' gauge symmetry. The model is designed to explain the known muon anomalies, i.e., the observed deviations from Standard Model predictions in the anomalous magnetic moment of the muon, Delta a(mu), and in b -> sl(+)l(-) processes. We perform a global chi(2) analysis of the data with 65 model parameters and including 98 observables. We find many points with chi(2) per degree of freedom <= 1. The vectorlike leptons and the new heavy Z' are typically much lighter than a TeV and would, thus, be eminently visible at the HL LHC.
