arXiv 0706.32582007-06-22hep-ph

核子中的奇异性

Strangeness in the Nucleon

Harleen Dahiya, Manmohan Gupta

备注：: 4 pages, To appear in the Proceedings of International Workshop on Theoretical High Energy Physics, 15-20 March 2007, Roorkee, India
发表信息：: AIPConf.Proc.939:3-6,2007
DOI：: 10.1063/1.2803778

摘要：

奇异性对质子磁矩的贡献、sigma_{πN}项、奇异自旋极化、奇异夸克味分布与非奇异夸克味分布之比等实验结果表明，核子中存在着与朴素组分夸克模型相矛盾的奇异性成分。具有组态混合的手征组分夸克模型（\chiCQM_{\rm config}）被认为对"质子自旋问题“和相关问题提供了令人满意的解释。本文将该模型推广到计算与核子奇夸克含量有关的参数，如奇自旋极化Δs，弱轴矢量形状因子的奇分量Δ s和Δ_8以及F和D，质子的奇性磁矩μ_p^s，由σ_{πN}项得到的核子奇夸克含量f_s，奇异夸克与非奇异夸克的比值\frac{2 s}{u+d}和\frac{2 s}{\bar u+ \bar d}，奇异性对角动量求和规则的贡献等。我们的结果表明，广泛的一致性与实验观察以及其他理论的考虑。

英文摘要：

There are several different experimental indications, such as the strangeness contribution to the magnetic moment of the proton, sigma_{πN} term, strange spin polarization, ratio of strange and non strange quark flavor distributions which suggest that the nucleon contains a hidden strangeness component which is contradictory to the naive constituent quark model. Chiral constituent quark model with configuration mixing (\chiCQM_{\rm config}) is known to provide a satisfactory explanation of the ``proton spin problem'' and related issues. In the present work, we have extended the model to carry out the calculations for the parameters pertaining to the strange quark content of the nucleon, for example, the strange spin polarization Δs, strange components of the weak axial vector form factors ΔΣand Δ_8 as well as F and D, strangeness magnetic moment of the proton μ_p^s, the strange quark content in the nucleon f_s coming from the σ_{πN} term, the ratios between strange and non-strange quarks \frac{2 s}{u+d} and \frac{2 s}{\bar u+ \bar d}, contribution of strangeness to angular momentum sum rule etc.. Our result demonstrates the broad consistency with the experimental observations as well as other theoretical considerations.

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