We calculate the strange quark and antiquark distributions of the nucleon by using the effective chiral quark model, and find that the strange-antistrange asymmetry can bring a contribution of about 60--100% to the NuTeV deviation of $\sin^{2}\theta_{w}$ from the standard value measured in other electroweak processes. The results are insensitive to different inputs. The light-flavor quark asymmetry of $\bar{d}-\bar{u}$ is also investigated and found to be consistent with the experimental measurements. Therefore the chiral quark model provides a successful picture to understand the NuTeV anomaly, as well as the light-flavor quark asymmetry and the proton spin problem in previous studies.
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机译：我们通过使用有效的手性夸克模型计算了核子的奇夸克和反夸克分布，发现奇异-反距离不对称可为$ \ sin ^ {2}的NuTeV偏差带来约60--100％的贡献。 \ theta_ {w} $与其他电弱过程中测得的标准值相比。结果对不同的输入不敏感。还研究了$ \ bar {d}-\ bar {u} $的淡味夸克不对称性，发现与实验测量值一致。因此，手性夸克模型为了解NuTeV异常以及先前研究中的轻味夸克不对称和质子自旋问题提供了成功的图景。
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