Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-08-26
Phys.Lett. B607 (2005) 101-106
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 LaTeX pages, 2 figures, Version to appear in PLB
Scientific paper
10.1016/j.physletb.2004.12.054
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.
Ding Yong
Ma Bo-Qiang
Xu Rong-Guang
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