Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm
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Tarih
2023
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Amer Physical Soc
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
We present a new measurement of the positive muon magnetic anomaly, a, equivalent to (g,- 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, w similar to ip, and of the anomalous precession frequency corrected for beam dynamics effects, wa. From the ratio wa/w similar to ip, together with precisely determined external parameters, we determine a, = 116 592 057(25) x 10-11 (0.21 ppm). Combining this result with our previous result from the 2018 data, we obtain a,(FNAL) = 116592055(24) x 10-11 (0.20 ppm). The new experimental world average is a,(exp) = 116 592 059(22) x 10-11 (0.19 ppm), which represents a factor of 2 improvement in precision.
Açıklama
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Kaynak
Physical Review Letters
WoS Q Değeri
N/A
Scopus Q Değeri
Cilt
131
Sayı
16
