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Quark-antiquark asymmetry of helicity distributions in the nucleon sea
We study the helicity distributions of light flavor quark-antiquark ($q\overline{q}$) pairs in the nucleon sea. The valence quarks are handled by adopting the light-cone SU(6) quark-spectator-diquark model and the sea $q\overline{q}$ pairs are treated from statistical consideration by introducing the helicity suppression factors ${l}_{q}(x)$ and ${\overline{l}}_{q}(x)$ to parametrize the helicity …