Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm

doi:10.1103/PhysRevLett.131.161802

Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm

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Abstract

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

Original language	English
Article number	161802
Journal	Physical Review Letters
Volume	131
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevLett.131.161802
State	Published - Oct 20 2023

Bibliographical note

Publisher Copyright:
© 2023 authors. Published by the American Physical Society.

Funding

We thank the Fermilab management and staff for their strong support of this experiment, as well as our university and national laboratory engineers, technicians, and workshops for their tremendous support. Greg Bock and Joe Lykken set the blinding clock and diligently monitored its stability. The Muon Experiment was performed at the Fermi National Accelerator Laboratory, a U.S. Department of Energy, Office of Science, HEP User Facility. Fermilab is managed by Fermi Research Alliance, LLC (FRA), acting under Contract No. DE-AC02-07CH11359. Additional support for the experiment was provided by the Department of Energy offices of HEP and NP (USA), the National Science Foundation (USA), the Istituto Nazionale di Fisica Nucleare (Italy), the Science and Technology Facilities Council (UK), the Royal Society (UK), the National Natural Science Foundation of China (Grants No. 11975153 and No. 12075151), MSIP, NRF, and IBS-R017-D1 (Republic of Korea), the German Research Foundation (DFG) through the Cluster of Excellence PRISMA+ (EXC 2118/1, Project ID 39083149), the European Union Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Grant Agreements No. 101006726 and No. 734303, the European Union STRONG 2020 project under Grant Agreement No. 824093, and the Leverhulme Trust, LIP-2021-01.

Funders	Funder number
National Science Foundation Arctic Social Science Program
Ministry of Science, ICT and Future Planning
Instituto Nazionale di Fisica Nucleare
Horizon 2020 Framework Programme
Deutsche Forschungsgemeinschaft
U.S. Department of Energy
Royal Society of Medicine
Horizon 2020
Science and Technology Facilities Council	ST/T000988/1
Leverhulme Trust	LIP-2021-01
H2020 Marie Skłodowska-Curie Actions	101006726, 734303
National Retail Federation	IBS-R017-D1
Fermi Research Alliance, LLC	DE-AC02-07CH11359
California Department of Fish and Game	39083149, EXC 2118/1
National Natural Science Foundation of China (NSFC)	11975153, 12075151
European Commission	824093

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.131.161802

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@article{e93b37d0773d4e2ebb4c37ac6c9cbee8,

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, aμ(gμ-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, p′, and of the anomalous precession frequency corrected for beam dynamics effects, ωa. From the ratio ωa/p′, together with precisely determined external parameters, we determine aμ=116 592 057(25)×10-11 (0.21 ppm). Combining this result with our previous result from the 2018 data, we obtain aμ(FNAL)=116 592 055(24)×10-11 (0.20 ppm). The new experimental world average is aμ(exp)=116 592 059(22)×10-11 (0.19 ppm), which represents a factor of 2 improvement in precision.",

author = "Aguillard, \{D. P.\} and T. Albahri and D. Allspach and A. Anisenkov and K. Badgley and S. Bae{\ss}ler and I. Bailey and L. 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 C. Chen 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 \{Di Falco\}, S. and \{Di Sciascio\}, G. and B. Drendel and A. Driutti and Duginov, \{V. N.\} and R. Fatemi and T. Gorringe and B. Plaster",

note = "Publisher Copyright: {\textcopyright} 2023 authors. Published by the American Physical Society.",

year = "2023",

month = oct,

day = "20",

doi = "10.1103/PhysRevLett.131.161802",

language = "English",

volume = "131",

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

AU - Aguillard, D. P.

AU - Albahri, T.

AU - Allspach, D.

AU - Anisenkov, A.

AU - Badgley, K.

AU - Baeßler, S.

AU - Bailey, I.

AU - Bailey, L.

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 - Chen, C.

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 - Di Falco, S.

AU - Di Sciascio, G.

AU - Drendel, B.

AU - Driutti, A.

AU - Duginov, V. N.

AU - Fatemi, R.

AU - Gorringe, T.

AU - Plaster, B.

PY - 2023/10/20

Y1 - 2023/10/20

N2 - We present a new measurement of the positive muon magnetic anomaly, aμ(gμ-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, p′, and of the anomalous precession frequency corrected for beam dynamics effects, ωa. From the ratio ωa/p′, together with precisely determined external parameters, we determine aμ=116 592 057(25)×10-11 (0.21 ppm). Combining this result with our previous result from the 2018 data, we obtain aμ(FNAL)=116 592 055(24)×10-11 (0.20 ppm). The new experimental world average is aμ(exp)=116 592 059(22)×10-11 (0.19 ppm), which represents a factor of 2 improvement in precision.

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

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UR - https://www.scopus.com/pages/publications/85175608272#tab=citedBy

U2 - 10.1103/PhysRevLett.131.161802

DO - 10.1103/PhysRevLett.131.161802

M3 - Article

C2 - 37925710

AN - SCOPUS:85175608272

SN - 0031-9007

VL - 131

JO - Physical Review Letters

JF - Physical Review Letters

IS - 16

M1 - 161802

ER -

Measurement of the Positive Muon Anomalous Magnetic Moment to 0.20 ppm

Abstract

Bibliographical note

Funding

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