Summary
This paper reports a high-precision measurement of the positive muon's anomalous magnetic moment from the Fermilab Muon g-2 Experiment, using data collected in 2019–2020 with systematic improvements in beam stability and magnetic field characterisation. The result achieves 0.20 ppm precision and, combined with previous 2018 data, yields the most precise experimental world average to date (0.19 ppm), representing a twofold improvement in measurement precision over prior combined estimates.
UK applicability
This fundamental particle physics measurement has no direct applicability to UK farming systems, soil health, nutrient density, or agricultural practice. It may have indirect relevance to precision measurement standards and calibration methods used in scientific instruments.
Key measures
Positive muon anomalous magnetic moment aμ = 116,592,055(24)×10⁻¹¹ (0.20 ppm); ratio ωa/ω̃p′; combined experimental world average aμ(exp) = 116,592,059(22)×10⁻¹¹ (0.19 ppm)
Outcomes reported
The study measured the positive muon anomalous magnetic moment (aμ) to a precision of 0.20 ppm using 2019–2020 data from the Fermilab Muon g-2 Experiment, achieving a fourfold increase in analysed positron events and reducing systematic error by more than a factor of 2 compared to 2018 results.
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