Hadronic contribution to the running QED coupling at the Z-boson mass scale (3 pages)

• C.A. Domínguez ^[1] ; L.A. Hernández ^[2]
  1. [1] University of Cape Town

     University of Cape Town

     City of Cape Town, Sudáfrica

     
  2. [2] Universidad Autónoma Metropolitana-Iztapalapa, CdMex, México
• Localización: Revista Mexicana de Física, ISSN-e 0035-001X, Vol. 69, Nº. 2, 2023
• Idioma: inglés
• Enlaces
  • Texto completo
• Resumen

  • An update is described of a model independent method to determine the hadronic contribution to the QED running coupling at the Z-boson mass scale, ∆α_(HAD)(M^(2)_(Z)). The major source of uncertainty is from the contribution of the light quark vector current correlator at zero momentum. This uncertainty is substantially reduced using recently improved lattice QCD results for this correlator. The result is ∆α_(HAD)(M^(2_(Z)) = 274.13(0.73) × 10^(−4).