$\mathcal{g}$ ₋ 2 of charged leptons, $α(M_Z^2)$, and the hyperfine splitting of muonium

Keshavarzi, Alexander; Nomura, Daisuke; Teubner, Thomas

doi:10.1103/physrevd.101.014029

Title: $$\mathcal{g}$$ ₋ 2 of charged leptons, $$α(M_Z^2)$$, and the hyperfine splitting of muonium

Journal Article · 29 January 2020 · Physical Review D

DOI: https://doi.org/10.1103/physrevd.101.014029 · OSTI ID:1595860

^[1]; Nomura, Daisuke ^[2];

^[3]

Univ. of Manchester (United Kingdom); Univ. of Mississippi, Oxford, MS (United States)
KEK Theory Center, Ibaraki (Japan)
Univ. of Liverpool (United Kingdom)

Following updates in the compilation of $e^+e^₋ →$ hadrons data, this work presents reevaluations of the hadronic vacuum polarization contributions to the anomalous magnetic moments of the electron ($$a_e$$), muon ($$a_μ$$) and tau lepton ($$a_τ$$), 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, $$α(M^2_Z)$$ . 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 a μ and its Standard Model prediction amounts to $$Δa_μ$$ = (28.02 ± 7.37) × 10^₋10, corresponding to a muon $$\mathcal{g}$$ ₋ 2 discrepancy of 3.8σ.

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Research Organization:: Univ. of Mississippi, Oxford, MS (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: Science and Technology Facilities Council (STFC); USDOE Office of Science (SC), High Energy Physics (HEP); Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: SC0012391; AC02-07CH11359; ST/S000925/1; JP17H01133; ST/P000290/1; ST/S000879/1

OSTI ID:: 1595860

Alternate ID(s):: OSTI ID: 1802339

Journal Information:: Physical Review D, Vol. 101, Issue 1; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 330 works

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