Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm

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2308.06230v1
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hep-ex

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Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm. / Muon g-2.
2023.

Research output: Working paper › Preprint

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@techreport{72dcb34b869d4c15b9a0f6a0a0611b53,

title = "Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm",

abstract = "We present a new measurement of the positive muon magnetic anomaly, $a_\mu \equiv (g_\mu - 2)/2$, from the Fermilab Muon $g\!-\!2$ Experiment based on data collected in 2019 and 2020. We have analyzed more than four 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 two due to better running conditions, a more stable beam, and improved knowledge of the magnetic field weighted by the muon distribution, $\tilde{\omega}'^{}_p$, and of the anomalous precession frequency corrected for beam dynamics effects, $\omega_a$. From the ratio $\omega_a / \tilde{\omega}'^{}_p$, together with precisely determined external parameters, we determine $a_\mu = 116\,592\,057(25) \times 10^{-11}$ (0.21 ppm). Combining this result with our previous result from the 2018 data, we obtain $a_\mu\text{(FNAL)} = 116\,592\,055(24) \times 10^{-11}$ (0.20 ppm). The new experimental world average is $a_\mu (\text{Exp}) = 116\,592\,059(22)\times 10^{-11}$ (0.19 ppm), which represents a factor of two improvement in precision. ",

keywords = "hep-ex",

author = "{Muon g-2} and Aguillard, {D. P.} and T. Albahri and D. Allspach and A. Anisenkov and K. Badgley and S. Bae{\ss}ler and I. Bailey and Baranov, {V. A.} and E. Barlas-Yucel and T. Barrett and E. Barzi and F. Bedeschi and M. Berz and M. Bhattacharya and Binney, {H. P.} and P. Bloom and J. Bono and E. Bottalico and T. Bowcock and S. Braun and M. Bressler and G. Cantatore and Carey, {R. M.} and Casey, {B. C. K.} and D. Cauz and R. Chakraborty and A. Chapelain and S. Chappa and S. Charity and M. Cheng and R. Chislett and Z. Chu and Chupp, {T. E.} and C. Claessens and Convery, {M. E.} and S. Corrodi and L. Cotrozzi and Crnkovic, {J. D.} and S. Dabagov and Debevec, {P. T.} and Falco, {S. Di} and Sciascio, {G. Di} and B. Drendel and A. Driutti and Duginov, {V. N.} and M. Eads and A. Edmonds and J. Esquivel and R. Fatemi and E. Valetov",

note = "8 pages, 3 figures",

year = "2023",

month = aug,

day = "11",

language = "English",

type = "WorkingPaper",

}

RIS

TY - UNPB

T1 - Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm

AU - Muon g-2

AU - Aguillard, D. P.

AU - Albahri, T.

AU - Allspach, D.

AU - Anisenkov, A.

AU - Badgley, K.

AU - Baeßler, S.

AU - Bailey, I.

AU - Baranov, V. A.

AU - Barlas-Yucel, E.

AU - Barrett, T.

AU - Barzi, E.

AU - Bedeschi, F.

AU - Berz, M.

AU - Bhattacharya, M.

AU - Binney, H. P.

AU - Bloom, P.

AU - Bono, J.

AU - Bottalico, E.

AU - Bowcock, T.

AU - Braun, S.

AU - Bressler, M.

AU - Cantatore, G.

AU - Carey, R. M.

AU - Casey, B. C. K.

AU - Cauz, D.

AU - Chakraborty, R.

AU - Chapelain, A.

AU - Chappa, S.

AU - Charity, S.

AU - Cheng, M.

AU - Chislett, R.

AU - Chu, Z.

AU - Chupp, T. E.

AU - Claessens, C.

AU - Convery, M. E.

AU - Corrodi, S.

AU - Cotrozzi, L.

AU - Crnkovic, J. D.

AU - Dabagov, S.

AU - Debevec, P. T.

AU - Falco, S. Di

AU - Sciascio, G. Di

AU - Drendel, B.

AU - Driutti, A.

AU - Duginov, V. N.

AU - Eads, M.

AU - Edmonds, A.

AU - Esquivel, J.

AU - Fatemi, R.

AU - Valetov, E.

N1 - 8 pages, 3 figures

PY - 2023/8/11

Y1 - 2023/8/11

N2 - We present a new measurement of the positive muon magnetic anomaly, $a_\mu \equiv (g_\mu - 2)/2$, from the Fermilab Muon $g\!-\!2$ Experiment based on data collected in 2019 and 2020. We have analyzed more than four 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 two due to better running conditions, a more stable beam, and improved knowledge of the magnetic field weighted by the muon distribution, $\tilde{\omega}'^{}_p$, and of the anomalous precession frequency corrected for beam dynamics effects, $\omega_a$. From the ratio $\omega_a / \tilde{\omega}'^{}_p$, together with precisely determined external parameters, we determine $a_\mu = 116\,592\,057(25) \times 10^{-11}$ (0.21 ppm). Combining this result with our previous result from the 2018 data, we obtain $a_\mu\text{(FNAL)} = 116\,592\,055(24) \times 10^{-11}$ (0.20 ppm). The new experimental world average is $a_\mu (\text{Exp}) = 116\,592\,059(22)\times 10^{-11}$ (0.19 ppm), which represents a factor of two improvement in precision.

AB - We present a new measurement of the positive muon magnetic anomaly, $a_\mu \equiv (g_\mu - 2)/2$, from the Fermilab Muon $g\!-\!2$ Experiment based on data collected in 2019 and 2020. We have analyzed more than four 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 two due to better running conditions, a more stable beam, and improved knowledge of the magnetic field weighted by the muon distribution, $\tilde{\omega}'^{}_p$, and of the anomalous precession frequency corrected for beam dynamics effects, $\omega_a$. From the ratio $\omega_a / \tilde{\omega}'^{}_p$, together with precisely determined external parameters, we determine $a_\mu = 116\,592\,057(25) \times 10^{-11}$ (0.21 ppm). Combining this result with our previous result from the 2018 data, we obtain $a_\mu\text{(FNAL)} = 116\,592\,055(24) \times 10^{-11}$ (0.20 ppm). The new experimental world average is $a_\mu (\text{Exp}) = 116\,592\,059(22)\times 10^{-11}$ (0.19 ppm), which represents a factor of two improvement in precision.

KW - hep-ex

M3 - Preprint

BT - Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm

ER -

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