标题： 瞬子与核子磁性 显示英文标题

标题： Instantons and Nucleon Magnetism

摘要： 我们通过在磁性背景场中对核子关联函数的算符乘积展开实施直接瞬子贡献，构建了改进的QCD求和规则用于核子磁矩。 发现瞬子贡献仅影响之前被认为不稳定的那些求和规则。 新的求和规则表现出高度的稳定性，并且对于与其它估计一致的磁性夸克凝聚态敏感度值，能够重现核子磁矩的实验值。 显示英文摘要

摘要： We construct improved QCD sum rules for the nucleon magnetic moments by implementing direct-instanton contributions to the operator product expansion of the nucleon correlator in a magnetic background field. The instanton contributions are found to affect only those sum rules which had previously been considered unstable. The new sum rules show a high degree of stability and reproduce the experimental values of the nucleon magnetic moments for values of the magnetic quark condensate susceptibility which are consistent with other estimates.