g2g-2 of charged leptons, α(MZ2)\alpha (M^2_Z) , and the hyperfine splitting of muonium

Nov 1, 2019
15 pages
Published in:
  • Phys.Rev.D 101 (2020) 1, 014029
  • Published: Jan 30, 2020
e-Print:
DOI:
Report number:
  • MAN/HEP/2019/010,
  • LTH 1216,
  • KEK-TH-2165

Citations per year

20032009201520212025050100150
Abstract: (APS)
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 (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)×10-10, corresponding to a muon g-2 discrepancy of 3.8σ.
Note:
  • 25 pages, 9 figures
  • Strong Interactions
  • vacuum polarization: hadronic
  • muonium: hyperfine structure
  • electron: magnetic moment
  • muon: magnetic moment
  • tau: magnetic moment
  • electromagnetic interaction: coupling constant
  • ground state: hyperfine structure
  • mass: scale
  • photon photon: scattering