论文标题
短途HLBL对MUON G-2的贡献
Short-distance HLbL contributions to the muon g-2
论文作者
论文摘要
标准模型预测与MUON异常磁矩的实验值之间的当前$3.7σ$差异可能是新物理学存在的暗示。 HADRONIC LIND-LIGHT贡献是需要在理论方面提高精度的部分之一，一个重要的步骤是为包含四个电磁电流的该数量提供短途限制。在这里，我们在静态极限中获得了三个大光子循环虚拟虚拟和外部第四光子的这种短距离约束。静态光子被认为是背景场，我们在该场的存在下构建了系统的操作员产品扩展。我们表明，无数的夸克循环，即领先术语，在非扰动贡献到近代的领先顺序上在数值上占主导地位，这两种命令都被夸克群体抑制的贡献和那些没有抑制的人。
The current $3.7σ$ discrepancy between the Standard Model prediction and the experimental value of the muon anomalous magnetic moment could be a hint for the existence of new physics. The hadronic light-by-light contribution is one of the pieces requiring improved precision on the theory side, and an important step is to derive short-distance constraints for this quantity containing four electromagnetic currents. Here, we derive such short-distance constraints for three large photon loop virtualities and the external fourth photon in the static limit. The static photon is considered as a background field and we construct a systematic operator product expansion in the presence of this field. We show that the massless quark loop, i.e. the leading term, is numerically dominant over non-perturbative contributions up to next-to-next-to leading order, both those suppressed by quark masses and those that are not.
