{"id":"doi:10.1103/physrevlett.131.161802","kind":"article","title":"Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm","authors":["D. P. Aguillard","T. Albahri","D. H. Allspach","A. V. Anisenkov","Karie E. Badgley","S. Baeßler","I. Bailey","L. Bailey","V. A. Baranov","E. Barlas-Yucel","Tucker Barrett","E. Barzi","F. Bedeschi","Martin Berz","Meghna Bhattacharya","H. P. Binney","Paul C Bloom","J. Bono","E. Bottalico","T. J. V. Bowcock","S. Braun","M. Bressler","G. Cantatore","R. M. Carey","B. C. K. Casey"],"author_count":100,"year":2023,"published":"2023-10-17","venue":"Physical Review Letters","cited_by":368,"doi":"10.1103/physrevlett.131.161802","arxiv_id":null,"nct_id":null,"source_url":"https://doi.org/10.1103/physrevlett.131.161802","archive_url":"https://space-kitty.com/papers/doi:10.1103/physrevlett.131.161802","updated":null,"pmid":"37925710","pmcid":null,"openalex_id":"W4387706996","pdf_url":"http://link.aps.org/pdf/10.1103/PhysRevLett.131.161802","abstract":"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.","abstract_license":"CC-BY (publisher license, via OpenAlex)","license":"cc-by","is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Particle physics theoretical and experimental studies"],"details":null,"provenance":"openalex","attribution":"Abstract of \"Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm\" by D. P. Aguillard, T. Albahri, D. H. Allspach et al., https://doi.org/10.1103/physrevlett.131.161802, used under its Creative Commons Attribution license (CC-BY); markup removed, otherwise unmodified.","topics":[{"slug":"particle-physics-bsm","name":"Particle Physics & Beyond the Standard Model","domain_slug":"physics"}],"cited_in_dossiers":[{"slug":"particle-physics-bsm","title":"Particle Physics & Beyond the Standard Model: State of the Field (October 2026)","url":"https://space-kitty.com/dossiers/particle-physics-bsm"}]}