${\alpha }_s(M_Z^2)$ and $R_b$ discrepancy with nonuniversal interactions

Abstract

We implement global fits to LEP data with the \non interactions. Consistent $R_b$ with experimental value and consistent $\as(M_Z^2)$ with that from low energy experiments are obtained. We also find that the $\xx$ is better than the Standard Model. And we argue that other kinds of new physics are needed to explain the difference between the values of $\as(M_Z^2)$ from low energy experiments and from the 3-jet ratio.

9 pages, ReVTeX, 1 table and 1 figure

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Cited by in corpus (4)

• Probing anomalous right--handed current in Z b bbar vertex
• Application of Pade Approximants to Determination of alpha_s(M_Z^2) from Hadronic Event Shape Observables in e+e- Annihilation
• Implications of the recent CERN LEP data on nonuniversal interactions with the precision electroweak tests
• New Precision Electroweak Tests in Supergravity Models