Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm
Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm
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DOI：
10.1103/physrevlett.131.161802
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发表时间：
2023-10-20
影响因子：
8.6
通讯作者：
Zhang, C.
中科院分区：
文献类型：
--
作者：
Aguillard, D. P.;Albahri, T.;Zhang, C.
我们使用2019年和2020年收集的数据，从费米实验室Muon g-2实验中提出了一种新的正μ子磁异常测量方法，a相当于（g，-2）/2。我们分析的μ子衰变的正电子数量是我们之前2018年数据结果的4倍多。由于更好的运行条件，更稳定的束流，以及由μ子分布加权的磁场的改进知识，w类似于ip，以及针对束流动力学效应校正的异常进动频率的改进知识，系统误差减少了2倍以上。根据与ip相似的比值wa/w，以及精确测定的外部参数，我们确定了ai = 116 592 057（25）x 10 - 11（0.21 ppm）。将此结果与我们之前从2018年数据中获得的结果相结合，我们得到a，（FNAL）= 116592055（24）x 10 - 11（0.20 ppm）。新的实验世界平均值为a，（exp）= 116 592 059（22）x 10 - 11（0.19 ppm），这表示精度提高了2倍。
We present a new measurement of the positive muon magnetic anomaly, a, equivalent to (g,- 2)/2, from the Fermilab Muon g - 2 Experiment using data collected in 2019 and 2020. We have analyzed more than 4 times the number of positrons from muon decay than in our previous result from 2018 data. The systematic error is reduced by more than a factor of 2 due to better running conditions, a more stable beam, and improved knowledge of the magnetic field weighted by the muon distribution, w similar to ip, and of the anomalous precession frequency corrected for beam dynamics effects, wa. From the ratio wa/w similar to ip, together with precisely determined external parameters, we determine a, = 116 592 057(25) x 10-11 (0.21 ppm). Combining this result with our previous result from the 2018 data, we obtain a,(FNAL) = 116592055(24) x 10-11 (0.20 ppm). The new experimental world average is a,(exp) = 116 592 059(22) x 10-11 (0.19 ppm), which represents a factor of 2 improvement in precision.