(1 University of Science and Technology of China,Hefei 230026,China)
(2 State Key Laboratory of Particle Detection and Electronics,Hefei 230026,China)
(3 Institute of High Energy Physics,Beijing 100049,China)
(4 University of Chinese Academy of Sciences,Beijing 100049,China)
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.
周小蓉,黄光顺,李海波. 缪轻子反常磁矩和北京谱仪实验[J]. 物理, 2021, 50(8): 535-541.
ZHOU Xiao-Rong,HUANG Guang-Shun,LI Hai-Bo. The anomalous magnetic moment of the muon, and the Beijing Spectrometer experiment. Physics, 2021, 50(8): 535-541.