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[en] 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 betwen 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. (orig.)
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Apr 1996; 12 p; ISSN 0418-9833; 