• Open Access

g2 of charged leptons, α(MZ2), and the hyperfine splitting of muonium

Alexander Keshavarzi, Daisuke Nomura, and Thomas Teubner
Phys. Rev. D 101, 014029 – Published 29 January 2020

Abstract

Following updates in the compilation of e+ehadrons data, this work presents reevaluations of the hadronic vacuum polarization contributions to the anomalous magnetic moments of the electron (ae), muon (aμ) and tau lepton (aτ), to the ground-state hyperfine splitting of muonium and also updates the hadronic contributions to the running of the QED coupling at the mass scale of the Z boson, α(MZ2). Combining the results for the hadronic vacuum polarization contributions with recent updates for the hadronic light-by-light corrections, the electromagnetic and the weak contributions, the deviation between the measured value of aμ and its Standard Model prediction amounts to Δaμ=(28.02±7.37)×1010, corresponding to a muon g2 discrepancy of 3.8σ.

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  • Received 3 December 2019

DOI:https://doi.org/10.1103/PhysRevD.101.014029

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Alexander Keshavarzi1,2,*, Daisuke Nomura3,†, and Thomas Teubner4,‡

  • 1Department of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom
  • 2Department of Physics and Astronomy, The University of Mississippi, Mississippi 38677, USA
  • 3KEK Theory Center, Tsukuba, Ibaraki 305-0801, Japan
  • 4Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, United Kingdom

  • *alexander.keshavarzi@manchester.ac.uk
  • dnomura@post.kek.jp
  • thomas.teubner@liverpool.ac.uk

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Vol. 101, Iss. 1 — 1 January 2020

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