Influence of heavy-quark recombination on the nucleon strangeness asymmetry

Abstract

The nucleon strange and antistrange 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(HR)(-) should be added to the initially extracted strangeness asymmetry S(-) equivalent to integral dx [s (x ) - (S) over bar (x)] x, supporting the strangeness asymmetry S(-) being positive, which is helpful to explain the NuTeV anomaly within the framework of the standard model.