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Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm

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dc.contributor.authorAbi, B.
dc.contributor.authorAlbahri, T.
dc.contributor.authorAl-Kilani, S.
dc.contributor.authorDabagov, S.
dc.contributor.authorДабагов, Султан Барасбиевич
dc.date.accessioned2024-11-29T13:11:07Z
dc.date.available2024-11-29T13:11:07Z
dc.date.issued2021
dc.description.abstract© 2021 authors.We present the first results of the Fermilab National Accelerator Laboratory (FNAL) Muon g-2 Experiment for the positive muon magnetic anomaly aμ(gμ-2)/2. The anomaly is determined from the precision measurements of two angular frequencies. Intensity variation of high-energy positrons from muon decays directly encodes the difference frequency ωa between the spin-precession and cyclotron frequencies for polarized muons in a magnetic storage ring. The storage ring magnetic field is measured using nuclear magnetic resonance probes calibrated in terms of the equivalent proton spin precession frequency ω p ′ in a spherical water sample at 34.7 °C. The ratio ωa/ω p ′, together with known fundamental constants, determines aμ(FNAL)=116 592 040(54)×10-11 (0.46 ppm). The result is 3.3 standard deviations greater than the standard model prediction and is in excellent agreement with the previous Brookhaven National Laboratory (BNL) E821 measurement. After combination with previous measurements of both μ+ and μ-, the new experimental average of aμ(Exp)=116 592 061(41)×10-11 (0.35 ppm) increases the tension between experiment and theory to 4.2 standard deviations.
dc.identifier.citationMeasurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm / Abi, B. [et al.] // Physical Review Letters. - 2021. - 126. - № 14. - 10.1103/PhysRevLett.126.141801
dc.identifier.doi10.1103/PhysRevLett.126.141801
dc.identifier.urihttps://www.doi.org/10.1103/PhysRevLett.126.141801
dc.identifier.urihttps://www.scopus.com/record/display.uri?eid=2-s2.0-85104363755&origin=resultslist
dc.identifier.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000652187800004
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/23892
dc.relation.ispartofPhysical Review Letters
dc.titleMeasurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
dc.typeArticle
dspace.entity.typePublication
oaire.citation.issue14
oaire.citation.volume126
relation.isAuthorOfPublicationabd62643-2e64-466a-b2ec-0974090640f7
relation.isAuthorOfPublication.latestForDiscoveryabd62643-2e64-466a-b2ec-0974090640f7
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