Strange quark asymmetry in the nucleon and the NuTeV anomaly
Johan Alwall, Gunnar Ingelman
Abstract
The NuTeV anomaly of a non-universal value of the fundamental parameter sin2θW in the electroweak theory has been interpreted as an indication for new physics beyond the Standard Model. However, the observed quantity depends on a possible asymmetry in the momentum distributions of strange quarks and antiquarks in the nucleon. This asymmetry occurs naturally in a phenomenologically successful physical model for such parton distributions, which reduces the NuTeV result to only about two standard deviations from the Standard Model.
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