We calculate the strange quark and antiquark distributions of the nucleon byusing the effective chiral quark model, and find that the strange-antistrangeasymmetry can bring a contribution of about 60--100% to the NuTeV deviation of$\sin^{2}\theta_{w}$ from the standard value measured in other electroweakprocesses. The results are insensitive to different inputs. The light-flavorquark asymmetry of $\bar{d}-\bar{u}$ is also investigated and found to beconsistent with the experimental measurements. Therefore the chiral quark modelprovides a successful picture to understand the NuTeV anomaly, as well as thelight-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来计算核子的奇夸克和反夸克分布，发现奇异-反距离不对称性可以对NuTeV偏差$ \ sin ^ {2} \ theta_贡献约60--100％从其他电弱过程中测得的标准值中减去{w} $。结果对不同的输入不敏感。还对$ \ bar {d}-\ bar {u} $的光味夸克不对称性进行了研究，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光味夸克不对称和质子自旋问题提供了成功的图像。
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