标题： 轴向反常与核子自旋 显示英文标题

标题： Axial Anomaly and the Nucleon Spin

摘要： 在本文中，我们采用了一个特定的拉格朗日量，该拉格朗日量被引入以解决U(1)问题，作为有效的QCD拉格朗日量，并推导出了核子自旋的夸克成分的公式。 质子（\Delta \Sigma _p）和中子（\Delta \Sigma _n）的夸克成分之间的差异由该公式进行评估。 忽略高阶同位旋修正，该公式在大N_c极限下可以简化为Efremov的结果。 显示英文摘要

摘要： In this letter, we have taken a particular Lagrangian, which was introduced to resolve U(1) problem, as an effective QCD Lagrangian, and have derived a formula of the quark content of the nucleon spin. The difference between quark content of the proton (\Delta\Sigma_p) and that of the neutron (\Delta\Sigma_n) is evaluated by this formula. Neglecting the higher-order isospin corrections, this formula can reduce to Efremov's results in the large N_c limit.