New muon magnetic moment data from a Fermilab experiment (red) combined with previous Brookhaven National Lab data (blue) is in 4.2σ tension with the value calculated by the Muon g-2 Theory Initiative (green). Selected for a Viewpoint in Physics and an Editors’ Suggestion.
From the article:
Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppmB. Abi et al. (Muon Collaboration)
Phys. Rev. Lett. 126, 141801 (2021)
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