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Aguillard, D. P.; Baeßler, S.; Bailey, I.; Baranov, V. A.; Barlas-Yucel, E.; Barrett, T.; Barzi, E.; Bedeschi, F.; Berz, M.; Bhattacharya, M.; Braun, S.; Bressler, M.; Cantatore, G.; Carey, R. M.; Casey, B. C. K.; Cauz, D.; Chakraborty, R.; Chapelain, A.; Convery, M. E.; Corrodi, S.; Cotrozzi, L.; Dabagov, S.; Di Sciascio, G.; Drendel, B.; Duginov, V. N.; Edmonds, A.; Fatemi, R.; Fertl, M.; Fioretti, A.; Friedsam, H.; Froemming, N. S.; Gaines, I.; Galati, M. D.; Garcia, A.; George, J.; Giovanetti, K. L.; Girotti, P.; Gohn, W.; Goodenough, L.; Gorringe, T.; Grange, J.; Grant, S.; Gray, F.; Halewood-Leagas, T.; Han, F.; Hempstead, J.; Hibbert, A.; Hodge, Z.; Hong, K. W.; Hong, R.; Hu, T.; Hu, Y.; Kammel, P.; Kawall, D.; Kelton, L.; Keshavarzi, A.; Kessler, D. S.; Khechadoorian, Z.; Khomutov, N. V.; Kiburg, M.; Kim, O.; Kraegeloh, E.; Kuchinskiy, N. A.; Lancaster, M.; Logashenko, I.; Lu, Z.; Lucà, A.; Lukicov, G.; Lusiani, A.; Lyon, A. L.; Madrak, R.; Miozzi, S.; Mitra, B.; Mott, J.; Nath, A.; Ng, J. K.; Oksuzian, Y.; Omarov, Z.; Pauletta, G.; Pitts, K. T.; Počanić, D.; Pohlman, N.; Polly, C. C.; Price, J.; Santi, L.; Schreckenberger, A.; Semertzidis, Y. K.; Shemyakin, D.; Stöckinger, D.; Stapleton, J.; Sweetmore, G.; Tarazona, D. A.; Teubner, T.; Tran, N. H.; Valetov, E.; Venanzoni, G.; Volnykh, V. P.; Walton, T.; Welty-Rieger, L.; Zeng, Y.
Physical review letters, 10/2023, Letnik: 131, Številka: 16Journal Article
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, ωover ˜_{p}^{'}, and of the anomalous precession frequency corrected for beam dynamics effects, ω_{a}. From the ratio ω_{a}/ωover ˜_{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.
