标题： 核子价夸克分布中的电荷对称性破缺 显示英文标题

标题： Charge Symmetry Breaking in the Valence Quark Distributions of the Nucleon

摘要： 利用夸克模型，我们研究了电荷对称性破缺效应对核子的valence夸克分布的影响。 由夸克质量差异以及带电夸克的库仑相互作用导致的效果被计算出来，并且与最近的一些主张相反，发现该效果很小。 此外，我们还研究了限制相互作用和用于关联夸克模型分布与实验的微扰演化方程中的电荷对称性破缺效应。我们发现这两种效应都很小，并且标量限制相互作用中包含的强电荷对称性破缺效应可能与夸克质量差异产生的效应区分开来。 显示英文摘要

摘要： Using a quark model, we study the effect of charge symmetry breaking on the valence quark distributions of the nucleon. The effect due to quark mass differences and the Coulomb interaction of the electrically charged quarks is calculated and, in contrast to recent claims, found to be small. In addition, we investigate the effect of charge symmetry breaking in the confining interaction, and in the perturbative evolution equations used to relate the quark model distributions to experiment. We find that both these effects are small, and that the strong charge symmetry breaking effect included in the scalar confining interactions may be distinguishable from that generated by quark mass differences.