Influence of Heavy Quark Recombination on the Nucleon Strangeness Asymmetry

Abstract

The nucleon strange and anti-strange distribution asymmetry is an important issue in the study of the nucleon structure. In this work, we show that the heavy quark recombination processes from a perturbative QCD picture can give a sizable influence on the measurement of the nucleon strangeness asymmetry from charged-current charm production processes, such as the CCFR and NuTeV dimuon measurements. When the influence of heavy quark recombination is considered, a positive effective $\delta S_{\mathrm{HR}}^{-}$ should be added to the initially extracted strangeness asymmetry $S^{-}\equiv \int dx[s(x)-\bar{s}(x)]x$, supporting the strangeness asymmetry $S^{-}$ being positive, which is helpful to explain the NuTeV anomaly within the framework of the standard model.

Comments: 5 latex pages, 2 figures