缪轻子反常磁矩和北京谱仪实验

最新的缪子反常磁矩实验测量结果与标准模型理论预言偏离4.2σ，提供了新物理存在的重要证据。然而要确认新物理的存在，实验和理论还需要进一步提高精度。运行在量子色动力学微扰与非微扰过渡能区的北京谱仪实验能够约束缪子反常磁矩理论计算中最重要的误差来源——强相互作用的修正。文章介绍了缪子反常磁矩的实验与理论现状，特别是北京谱仪实验上相关的研究成果，并展望了未来缪子反常磁矩的实验测量与理论计算。

The anomalous magnetic moment of the muon,and the Beijing Spectrometer experiment

The latest experimental measurements of the anomalous magnetic moment of the muon deviates from the theoretical prediction by 4.2 sigma, which provides essential evidence for the existence of new physics beyond the Standard Model. To confirm this, however, further improvements in the precision for both experimental measurements and theoretical predictions are necessary. The Beijing Spectrometer experiment at the Beijing Electron-Positron Collider facility, operating in the transition energy range between perturbative and non-perturbative quantum chromodynamics, is an ideal playground for the study of strong interactions in the low energy region; it is an important contributor to the theoretical prediction of the anomalous magnetic moment by providing a stringent constraint on the dominant theoretical uncertainty——the hadronic vacuum polarization. In this paper, the current status of experimental measurements and theoretical prediction are reviewed, and future expectations are assessed.