Using assumed quadratic mass scaling, LEP radius limits imply δa_tau < 1.6e-6, δa_mu < 4.1e-9, and δa_e < 6.7e-14, with the tau bound being the strongest available.
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Muon (and Lepton) Anomalous Magnetic Moments and Limits on Their Radii
Using assumed quadratic mass scaling, LEP radius limits imply δa_tau < 1.6e-6, δa_mu < 4.1e-9, and δa_e < 6.7e-14, with the tau bound being the strongest available.