Violations of universality in a vectorlike extension of the standard model
István Montvay
Abstract
Violations of universality of couplings in a vectorlike extension of the standard model with three heavy mirror fermion families are considered. The recently observed discrepancies between experiments and the standard model in the hadronic branching fractions Rb and Rc of the Z-boson are explained by the mixing of fermions with their mirror fermion partners.
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