Measurement of the Electron Magnetic Moment
Measurement of the Electron Magnetic Moment
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DOI：
10.1103/physrevlett.130.071801
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发表时间：
2023-02-13
影响因子：
8.6
通讯作者：
Gabrielse, G.
中科院分区：
文献类型：
--
作者：
Fan, X.;Myers, T. G.;Gabrielse, G.
确定的电子磁矩 -mu=mu B = g=2 = 1.001 159 652 180 59 (13) [0.13 ppt] 比 14 年的值精确 2.2 倍。基本粒子的最精确确定的属性测试了标准模型 (SM) 的最精确预测，精确到 1012 分之一。如果消除精细结构常数 α 的差异测量带来的不确定性，则测试将提高一个数量级，因为 SM 预测是 α 的函数。新的测量和 SM 理论共同预测 alpha-1 = 137.035 999 166 (15) [0.11 ppb]，其不确定性比当前测量的 alpha 值之间的差异小 10 倍。
The electron magnetic moment, -mu=mu B = g=2 = 1.001 159 652 180 59 (13) [0.13 ppt], is determined 2.2 times more accurately than the value that stood for fourteen years. The most precisely determined property of an elementary particle tests the most precise prediction of the standard model (SM) to 1 part in 1012. The test would improve an order of magnitude if the uncertainty from discrepant measurements of the fine structure constant alpha is eliminated since the SM prediction is a function of alpha. The new measurement and SM theory together predict alpha-1 = 137.035 999 166 (15) [0.11 ppb] with an uncertainty 10 times smaller than the current disagreement between measured alpha values.