On the Effect of Asymmetric Strange Seas and Isospin-Violating Parton Distribution Functions on sin2thetaW Measured at NuTeV

Abstract

The NuTeV collaboration recently reported a value of sin2thetaW measured in neutrino-nucleon scattering that is 3 standard deviations above the standard model prediction. This result is derived assuming that (1) the strange sea is quark-antiquark symmetric, s(x)=sbar(x), and (2) up and down quark distributions are symmetric under the simultaneous interchange of u<->d and p<->n. We report the impact of violations of these symmetries on sin2thetaW and discuss the theoretical and experimental constraints on such asymmetries.

4 pages, 2 figures, to be submitted to PRD. v2. updated references, fixed format; v3. fixed error in Eqn 6 and delta-N definition and value

References in corpus (2)

• A Precise Determination of Electroweak Parameters in Neutrino-Nucleon Scattering
• Old and new physics interpretations of the NuTeV anomaly

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