Abstract
The Weinberg neutral current is incorporated into several quark-parton models in order to investigate the neutral-current-induced neutrino and antineutrino cross sections. The results are rather insensitive to the particular model, provided a good fit is made to the charged-current data. Typically, the $\frac{{\ensuremath{\sigma}}^{\overline{\ensuremath{\nu}}}}{{\ensuremath{\sigma}}^{\ensuremath{\nu}}}$ ratio for the neutral-current reactions can be considerably larger than $\frac{1}{3}$ for ${{sin}^{2}\ensuremath{\theta}}_{W}\ensuremath{\gtrsim}0.25$. Minima of 0.20 and 0.38 occur in the neutral-current to charged-current cross-section ratios for neutrino and antineutrino reactions, respectively.
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