Summary
This paper reports a precision measurement of the positive muon anomalous magnetic moment from the Fermilab Muon g-2 Experiment, achieving 0.20 ppm precision by analysing four times more positron events than the previous 2018 result and reducing systematic errors by more than a factor of two through improved experimental conditions and magnetic field characterisation. The combined result contributes to a new experimental world average of 0.19 ppm precision, representing a factor-of-two improvement in measurement precision and providing an important benchmark for testing the Standard Model of particle physics.
UK applicability
This fundamental physics measurement has no direct applicability to United Kingdom farming systems, soil health, or nutrient density research. The work is relevant only to theoretical physics and particle detector development communities internationally.
Key measures
Anomalous magnetic moment aμ ≡ (gμ−2)/2 expressed as 116,592,055(24)×10⁻¹¹ (0.20 ppm precision); ratio of anomalous precession frequency to weighted magnetic field frequency ωa/ω̃ₚ′; systematic uncertainties in magnetic field characterisation and beam dynamics
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. Results were combined with 2018 data to establish a new experimental world average of 116,592,059(22)×10⁻¹¹.
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