标题： 介子研究的精选亮点 显示英文标题

标题： Selected highlights from the study of mesons

摘要： 我们简要回顾了使用QCD的Dyson-Schwinger方程研究介子的最新进展。 在这一过程中，我们涉及了禁闭和动态手征对称性破缺的一些方面，但主要关注的是：伪标量介子的精确结果，包括eta-eta'问题的一些方面；认识到所谓的真空凝聚实际上是有害子的内在局部性质；一种本质上非微扰的方法来构建保持对称性的Bethe-Salpeter核，这使得能够证明裸夸克在红外动量下具有大的动量依赖的异常色荷和电磁矩，并解决了理解rho-和a1-介子质量分裂的一个长期问题，现在可以清楚地看到它们在介子谱中是宇称伙伴；与带电和中性π介子相关的电磁形式因子的特征；以及伪标量介子中价夸克分布函数的计算和解释。 我们认为，在解决QCD的过程中，理论与现有和未来实验之间的建设性反馈将有助于对QCD的beta函数的红外行为施加约束，这是强子物理核心的非微扰量。 显示英文摘要

摘要： We provide a brief review of recent progress in the study of mesons using QCD's Dyson-Schwinger equations. Along the way we touch on aspects of confinement and dynamical chiral symmetry breaking but in the main focus upon: exact results for pseudoscalar mesons, including aspects of the eta-eta' problem; a realisation that the so-called vacuum condensates are actually an intrinsic, localised property of hadrons; an essentially nonperturbative procedure for constructing a symmetry-preserving Bethe-Salpeter kernel, which has enabled a demonstration that dressed-quarks possess momentum-dependent anomalous chromo- and electromagnetic moments that are large at infrared momenta, and resolution of a longstanding problem in understanding the mass-splitting between rho- and a1-mesons such that they are now readily seen to be parity partners in the meson spectrum; features of electromagnetic form factors connected with charged and neutral pions; and computation and explanation of valence-quark distribution functions in pseudoscalar mesons. We argue that in solving QCD, a constructive feedback between theory and extant and forthcoming experiments will enable constraints to be placed on the infrared behaviour of QCD's beta-function, the nonperturbative quantity at the core of hadron physics.