期刊
PHYSICAL REVIEW LETTERS
卷 93, 期 15, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.93.152003
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We point out that perturbative evolution in QCD at three loops generates a strange-antistrange asymmetry s(x)-(s) over bar (x) in the nucleon's sea just from the fact that the nucleon has nonvanishing up and down quark valence densities. The recently computed three-loop splitting functions allow for an estimate of this effect. We find that a fairly sizable asymmetry may be generated. Results for analogous asymmetries in the heavy-quark sector are also presented.
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