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Quark and lepton couplings in the weak interactions

1978; American Physical Society; Volume: 18; Issue: 9 Linguagem: Inglês

10.1103/physrevd.18.3214

1538-4500

L. F. Abbott, R. Michael Barnett,

Neutrino Physics Research

We present a comprehensive study of the weak neutral-current interactions of $u$ and $d$ quarks and of the electron. A model-independent analysis using data from deep-inelastic, inclusive-pion, elastic, and exclusive-pion neutrino processes provides a unique determination of the $u$- and $d$-quark couplings. For electron couplings, neutrino-electron-scattering, atomic-parity-violation, and new polarized-electron-scattering data are discussed. With the assumption of a single ${Z}^{0}$ boson, we show that the electron couplings are almost uniquely determined. The predictions of the Weinberg-Salam model (for ${{sin}^{2}\ensuremath{\theta}}_{W}=0.20\ensuremath{-}0.30$) are in remarkably good agreement with our results.