Summary
This paper reports a high-precision measurement of the positive muon anomalous magnetic moment conducted at Fermilab's Muon Campus using data from 2019–2020 accelerator runs. The measurement achieves 0.20 ppm precision when combined with the 2018 dataset, representing a 2.2-fold improvement and the world's most precise determination of this fundamental physics parameter. When combined with complementary measurements from Brookhaven National Laboratory, the new world average reaches 0.19 ppm precision, advancing empirical constraints on the Standard Model of particle physics.
UK applicability
This fundamental physics measurement has no direct application to UK farming systems, soil health, nutrient density, or human nutrition; it lies outside the scope of Vitagri's Pulse Brain research domains.
Key measures
Muon magnetic anomaly aμ = 116 592 055 (24) × 10−11 (0.20 ppm); ratio of muon spin precession frequency to cyclotron frequency; magnetic field strength via nuclear magnetic resonance; corrections for beam motion, beam dispersion, and transient fields.
Outcomes reported
The study measured the muon magnetic anomaly (aμ) using polarised muons in a storage ring, achieving a precision of 0.21 ppm from 2019–2020 data and 0.20 ppm when combined with 2018 data. This represents a 2.2-fold improvement over previous measurements and contributes to the world average precision of 0.19 ppm when combined with Brookhaven National Laboratory results.
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