The NuTeV Collaboration has extracted the electroweak parameter ${sin}^2{\theta }_W$ from the measurement of the ratios of neutral current to charged current $\nu$ and $\overline{\nu }$ cross sections. Our value, ${sin}^2{\theta }_W^{\left(\mathrm{on}-\mathrm{shell}\right)}=0.2277\mathrm{}\pm 0.0013\left(\mathrm{stat}\right)\pm 0.0009\left(\mathrm{syst}\right)$, is 3 standard deviations above the standard model prediction. We also present a model independent analysis of the same data in terms of neutral-current quark couplings.

• Received 25 October 2001

DOI:https://doi.org/10.1103/PhysRevLett.88.091802