Hadronic contribution to the running QED coupling at the Z-boson mass scale

2021/11/15 by C. A. Domínguez, Dominguez, Cesareo A., Hernández, Luis A.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2111.07546

openalex publication_date 2021/11/15 · openalex created_date 2022/05/05 · openalex updated_date 2026/07/28

Abstract

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, Δα_HAD(M_Z²). 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 Δα_HAD(M_Z²)=274.13 (0.73) × 10^-4.

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