Hadronic light-by-light scattering contribution to the muon g - 2: an effective field theory approach.
Hadronic light-by-light scattering contribution to the muon g - 2: an effective field theory approach.
复制标题
强子逐光散射对 μ 子 g - 2 的贡献：一种有效的场论方法。
DOI：
--
复制
发表时间：
2001
影响因子：
8.6
通讯作者：
E. Rafael
中科院分区：
文献类型：
--
作者：
Marc Knecht;A. Nyffeler;M. Perrottet;E. Rafael
从有效低能理论的角度讨论了强子光对介子反常磁矩a(U)的贡献。作为应用，计算了含有两个异常顶点的双圈图的前导对数的系数，并发现它是正的。这对应于π极对强子光-光校正值a(U)的贡献，以及a(U)的当前实验值与其标准模型中的理论对应值之间的差异的显著减小。
The hadronic light-by-light contribution to a(mu), the anomalous magnetic moment of the muon, is discussed from the point of view of an effective low-energy theory. As an application, the coefficient of the leading logarithm arising from the two-loop graphs involving two anomalous vertices is computed, and found to be positive. This corresponds to a positive sign for the pion-pole contribution to the hadronic light-by-light correction to a(mu), and to a sizable reduction of the discrepancy between the present experimental value of a(mu) and its theoretical counterpart in the standard model.