Summary
This paper presents a high-precision measurement of the positive muon anomalous magnetic moment using polarised muon data collected at Fermilab's Muon Campus during 2019–2020. The measurement exploits a 7.1-metre storage ring with uniform 1.45 T magnetic field to determine aμ from the difference between muon spin precession and cyclotron frequencies, normalised to nuclear magnetic resonance calibration of field strength. This result represents the world's most precise direct measurement of this fundamental constant and, when combined with Brookhaven National Laboratory data, yields an improved world average with 0.19 ppm precision.
UK applicability
This is a fundamental physics measurement with no direct applicability to UK agricultural, soil health, or food system research. The record appears to have been catalogued in Vitagri's Pulse Brain in error, as it falls entirely outside the scope of farming systems, soil health, nutrient density, and human health.
Key measures
Muon magnetic anomaly aμ = 116 592 055 (24) × 10⁻¹¹ (0.20 ppm); muon spin precession frequency; cyclotron frequency; magnetic field strength (1.45 T); world average aμ(exp) = 116 592 059 (22) × 10⁻¹¹ (0.19 ppm)
Outcomes reported
The study reports a new precision measurement of the muon magnetic anomaly (aμ) using positive muon data from Fermilab's 2019–2020 runs. The result achieves 0.20 ppm precision and represents a 2.2-fold improvement over the previous Fermilab dataset.
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