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Measurement of the Electron Magnetic Moment

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arxiv 2209.13084 v2 pith:G75SSIEX submitted 2022-09-27 physics.atom-ph hep-exquant-ph

Measurement of the Electron Magnetic Moment

classification physics.atom-ph hep-exquant-ph
keywords alphadeterminedelectronmagneticmeasurementmomentpredictiontimes
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The electron magnetic moment,$-\mu/\mu_B = g/2 = 1.001 \, 159 \, 652 \, 180 \, 59 \, (13) \, [0.13\, \rm{ppt}]$, is determined 2.2 times more accurately than the value that stood for 14 years. The most precisely determined property of an elementary particle tests the most precise prediction of the Standard Model (SM) to $1$ part in $10^{12}$. 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 $\alpha^{-1}=137.035 \, 999 \, 166 \, (15) \, [0.11 \, \rm{ppb}]$ with an uncertainty ten times smaller than the current disagreement between measured $\alpha$ values.

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