Abstract
We present the results of analytical calculations of the 3-loop contributions to the asymptotic photon vacuum polarization function, in the on-shell scheme, and of the 4-loop contributions to the on-shell QED β-function. These are used to evaluate various 4-loop and 5-loop contributions to the muon anomaly. Our analytical contributions to ( g − 2) μ differ significantly from previous numerical results. A very recent numerical re-evaluation of 4-loop muon-anomaly contributions has yielded results much closer to ours.
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