Probing High-Energy Physics with High-Precision QED Measurements
Stephan Narison
Abstract
I summarize our self-contained determinations of the lowest order hadronic contributions to the anomalous magnetic moments aμ,τ of the muon and tau leptons, the running QED coupling α(MZ) and the muonium hyperfine splitting ν. Using as a revised estimate of the light-by light scattering: aμ(LL)=85(18) 10-11, we deduce: aμSM = 116 591 861(78) 10-11, aτSM = 117 759(7) 10-8, giving: aμSM-aμexp=162(170) 10-11. We also obtain: α-1(MZ)=128.926(25) and the Fermi energy splitting: νFSM=4 459 031 783(229) Hz. Lower bounds on some eventual new physics are given, while νFSM leads e.g. to mμ/me=206.768 276(11) in remarkable agreement with the data.
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