: 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.
Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm / Aguillard, D. P.; Albahri, T.; Allspach, D.; Anisenkov, A.; Badgley, K.; Baeßler, S.; Bailey, I.; Bailey, L.; Baranov, V. A.; Barlas-Yucel, E.; Barrett, T.; Barzi, E.; Bedeschi, F.; Berz, M.; Bhattacharya, M.; Binney, H. P.; Bloom, P.; Bono, J.; Bottalico, E.; Bowcock, T.; Braun, S.; Bressler, M.; Cantatore, G.; Carey, R. M.; Casey, B. C. K.; Cauz, D.; Chakraborty, R.; Chapelain, A.; Chappa, S.; Charity, S.; Chen, C.; Cheng, M.; Chislett, R.; Chu, Z.; Chupp, T. E.; Claessens, C.; Convery, M. E.; Corrodi, S.; Cotrozzi, L.; Crnkovic, J. D.; Dabagov, S.; Debevec, P. T.; Di Falco, S.; Di Sciascio, G.; Drendel, B.; Driutti, A.; Duginov, V. N.; Eads, M.; Edmonds, A.; Esquivel, J.; Farooq, M.; Fatemi, R.; Ferrari, C.; Fertl, M.; Fienberg, A. T.; Fioretti, A.; Flay, D.; Foster, S. B.; Friedsam, H.; Froemming, N. S.; Gabbanini, C.; Gaines, I.; Galati, M. D.; Ganguly, S.; Garcia, A.; George, J.; Gibbons, L. K.; Gioiosa, A.; Giovanetti, K. L.; Girotti, P.; Gohn, W.; Goodenough, L.; Gorringe, T.; Grange, J.; Grant, S.; Gray, F.; Haciomeroglu, S.; Halewood-Leagas, T.; Hampai, D.; Han, F.; Hempstead, J.; Hertzog, D. W.; Hesketh, G.; Hess, E.; Hibbert, A.; Hodge, Z.; Hong, K. W.; Hong, R.; Hu, T.; Hu, Y.; Iacovacci, M.; Incagli, M.; Kammel, P.; Kargiantoulakis, M.; Karuza, M.; Kaspar, J.; Kawall, D.; Kelton, L.; Keshavarzi, A.; Kessler, D. S.; Khaw, K. S.; Khechadoorian, Z.; Khomutov, N. V.; Kiburg, B.; Kiburg, M.; Kim, O.; Kinnaird, N.; Kraegeloh, E.; Krylov, V. A.; Kuchinskiy, N. A.; Labe, K. R.; Labounty, J.; Lancaster, M.; Lee, S.; Li, B.; Li, D.; Li, L.; Logashenko, I.; Lorente Campos, A.; Lu, Z.; Lucà, A.; Lukicov, G.; Lusiani, A.; Lyon, A. L.; Maccoy, B.; Madrak, R.; Makino, K.; Mastroianni, S.; Miller, J. P.; Miozzi, S.; Mitra, B.; Morgan, J. P.; Morse, W. M.; Mott, J.; Nath, A.; Ng, J. K.; Nguyen, H.; Oksuzian, Y.; Omarov, Z.; Osofsky, R.; Park, S.; Pauletta, G.; Piacentino, G. M.; Pilato, R. N.; Pitts, K. T.; Plaster, B.; Počanić, D.; Pohlman, N.; Polly, C. C.; Price, J.; Quinn, B.; Qureshi, M. U. H.; Ramachandran, S.; Ramberg, E.; Reimann, R.; Roberts, B. L.; Rubin, D. L.; Santi, L.; Schlesier, C.; Schreckenberger, A.; Semertzidis, Y. K.; Shemyakin, D.; Sorbara, M.; Stöckinger, D.; Stapleton, J.; Still, D.; Stoughton, C.; Stratakis, D.; Swanson, H. E.; Sweetmore, G.; Sweigart, D. A.; Syphers, M. J.; Tarazona, D. A.; Teubner, T.; Tewsley-Booth, A. E.; Tishchenko, V.; Tran, N. H.; Turner, W.; Valetov, E.; Vasilkova, D.; Venanzoni, G.; Volnykh, V. P.; Walton, T.; Weisskopf, A.; Welty-Rieger, L.; Winter, P.; Wu, Y.; Yu, B.; Yucel, M.; Zeng, Y.; Zhang, C.; Null, Null. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - ELETTRONICO. - 131:16(2023), pp. 161802.--161802.-. [10.1103/physrevlett.131.161802]
Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm
Cantatore, G.;
2023-01-01
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.| File | Dimensione | Formato | |
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