Gauge-model constraints of recent elastic and deep-inelastic neutral-current data

Abstract

Recent neutrino-induced elastic and deep-inelastic neutral-current data are shown to impose stringent constraints on gauge models of weak interactions. For S${\mathrm{U}}_{2}$\ifmmode\times\else\texttimes\fi{}${\mathrm{U}}_{1}$ models, assuming left-handed $u$ and $d$ quarks in a doublet, only the Weinberg-Salam model is in agreement with the data. S${\mathrm{U}}_{2}$\ifmmode\times\else\texttimes\fi{}S${\mathrm{U}}_{2}$\ifmmode\times\else\texttimes\fi{}${\mathrm{U}}_{1}$ and S${\mathrm{U}}_{3}$\ifmmode\times\else\texttimes\fi{}${\mathrm{U}}_{1}$ models are also analyzed.