Abstract
The electron magnetic moment, -μ/μB=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 α is eliminated since the SM prediction is a function of α. The new measurement and SM theory together predict α-1=137.035 999 166 (15) [0.11 ppb] with an uncertainty 10 times smaller than the current disagreement between measured α values.
| Original language | English (US) |
|---|---|
| Article number | 071801 |
| Journal | Physical review letters |
| Volume | 130 |
| Issue number | 7 |
| DOIs | |
| State | Published - Feb 17 2023 |
Funding
Early contributions were made by S.\u2009E. Fayer. NSF 1903756 and 2110565 provided the support, with X. Fan supported by the Masason Foundation. Detector development is supported by the Templeton Foundation, and low-loss trap cavity development is supported by the DOE SQMS Center.
ASJC Scopus subject areas
- General Physics and Astronomy