Электронный каталог

Статья

Aquillard, D.P.
Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm / D.P.Aquillard, V.A.Baranov, V.N.Duginov, N.V.Khomutov, V.A.Krylov, N.A.Kuchinskiy, V.P.Volnykh, [a.o.] // Physical Review Letters [Electronic resource]. – 2023. – Vol.131, No.16. – P.161802. – URL: https://doi.org/10.1103/PhysRevLett.131.161802. – Bibliogr.:47.

We present a new measurement of the positive muon magnetic anomaly, a&sub(μ)≡(g&sub(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′&sub(p), and of the anomalous precession frequency corrected for beam dynamics effects, ωa. From the ratio ω&sub(a)/˜ω′&sub(p), together with precisely determined external parameters, we determine a&sub(μ)=116 592 057(25)×10&sup(−11) (0.21 ppm). Combining this result with our previous result from the 2018 data, we obtain a&sub(μ)(FNAL)=116 592 055(24)×10&sup(−11) (0.20 ppm). The new experimental world average is aμ(exp)=116 592 059(22)×10&sup(−11) (0.19 ppm), which represents a factor of 2 improvement in precision.



ОИЯИ = ОИЯИ (JINR)2023
Спец.(статьи,препринты) = С 346.3а - Основные свойства мю-мезонов: масса, типы и времена распадов
Бюллетени = 5/024