1998/09/22 by A. Hoecker, Hoecker, A.
Computer Science · Physics and Astronomy · #Electromagnetic Scattering and Analysis #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Matrix Theory and Algorithms #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9809488
9 pages, Talk given at the ICHEP'98 Conference, Vancouver, Canada, July 23-29, 1998
openalex publication_date 1998/09/22 · arxiv created 1998/11/13 · arxiv updated 2009/11/30 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
This talk summarizes the recent development in the evaluation of the leading order hadronic contributions to the running of the QED fine structure constant α(s), at s=M\rm Z2, and to the anomalous magnetic moments of the muon (g-2)μ. The accuracy of the theoretical prediction of these observables is limited by the uncertainties on the hadronic contributions. Significant improvement has been achieved in a series of new analyses which is presented historically in three steps: (I), use of τ spectral functions in addition to e+e- cross sections, (II), extended use of perturbative QCD and (III), application of QCD sum rule techniques. The most precise values obtained are: Δαhad (M2Z) =(276.3±1.6)×10-4, yielding α-1(M\rm Z2)=128.933±0.021, and aμ\rm had=(692.4±6.2)× 10-10 with which one finds for the complete Standard Model prediction aμ\rm SM=(11 659 159.6±6.7)×10-10. For the electron (g-2)e, the hadronic contribution is ae\rm had=(187.5±1.8)× 10-14.