Parton symmetries and the NuTeV anomaly
Abstract.Recently the NuTeV Collaboration (Phys. Rev. Lett. 88, 091802 (2002)) announced a new measurement of $\sin^{2} \theta_{\mathrm {W}}$ which was approximately three standard deviations above the currently accepted standard model value. The NuTeV analysis depends on the assumption that various quark-parton model symmetries are not broken. In particular the analysis takes $\bar{s}(x) = s(x)$ and dVn(x) = uVp(x). However models which break these symmetries are known. We examine the predictions of these models and their effect on the NuTeV result. In most instances the effect is to decrease the discrepancy between the NuTeV result and the accepted value.