Contribution of asymmetric strange-antistrange sea to the Paschos-Wolfenstein relation

摘要

The NuTeV Collaboration reported a value of sin(2)theta(w) measured in neutrino-nucleon deep inelastic scattering, and found that the value is three standard deviations from the standard model prediction. This result is obtained under the assumption that the strange quark-antiquark sea of nucleons are symmetric, and that the up and down quark distributions are symmetric with the simultaneous interchange of u d and p n. We discuss the contribution of asymmetric strange-antistrange sea to the Paschos-Wolfenstein relation in the extraction of weak mixing angle sin(2)theta(w). We also point out that the contribution of asymmetric strange-antistrange sea should remove roughly 30-80 of the discrepancy between the NuTeV result and other determinations of sin(2)theta(w) when using the light-cone meson-baryon model to calculate the contribution of the strange-antistrange sea. (C) 2004 Published by Elsevier B.V.