Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm.

Aguillard, DP, Albahri, T, Allspach, D, Anisenkov, A, Badgley, K, Baeßler, S, Bailey, I, Bailey, L, Baranov, VA, Barlas-Yucel, E
et al (show 182 more authors) (2023) Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm. Physical review letters, 131 (16). p. 161802.

Access the full-text of this item by clicking on the Open Access link.


We present a new measurement of the positive muon magnetic anomaly, a_{μ}≡(g_{μ}-2)/2, from the Fermilab Muon g-2 Experiment using data collected in 2019 and 2020. We have analyzed more than 4 times the number of positrons from muon decay than in our previous result from 2018 data. The systematic error is reduced by more than a factor of 2 due to better running conditions, a more stable beam, and improved knowledge of the magnetic field weighted by the muon distribution, ω[over ˜]_{p}^{'}, and of the anomalous precession frequency corrected for beam dynamics effects, ω_{a}. From the ratio ω_{a}/ω[over ˜]_{p}^{'}, together with precisely determined external parameters, we determine a_{μ}=116 592 057(25)×10^{-11} (0.21 ppm). Combining this result with our previous result from the 2018 data, we obtain a_{μ}(FNAL)=116 592 055(24)×10^{-11} (0.20 ppm). The new experimental world average is a_{μ}(exp)=116 592 059(22)×10^{-11} (0.19 ppm), which represents a factor of 2 improvement in precision.

Item Type: Article
Uncontrolled Keywords: Muon <math xmlns="" display="inline"><mi>g</mi><mo>−</mo><mn>2</mn></math> Collaboration
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 09 Jan 2024 10:44
Last Modified: 09 Jan 2024 10:44
DOI: 10.1103/physrevlett.131.161802
Open Access URL:
Related URLs: