Revised ${\alpha }^4$ term of lepton $g-2$ from the Feynman diagrams containing an internal light-by-light scattering subdiagram

Abstract

The ${\alpha }^4$ contribution to the lepton $g-2$ from a gauge-invariant set of 18 Feynman diagrams containing a light-by-light scattering subdiagram internally has been reevaluated by a method independent of the previous approach. Comparison of two methods revealed a program error in the first version. Correcting this error, the contributions of these 18 diagrams become -0.990 72 (10)$(\alpha /\pi {)}^4$ and -4.432 43 (58)$(\alpha /\pi {)}^4$ for the electron and muon $g-2$, respectively. The correction is not large enough to affect the comparison between theory and experiment for the muon $g-2$, but it does alter the inferred value for the fine structure constant ${\alpha }^{-1}$ by 6 ppb.

arXiv comment4 pages, 2 figures. The abstract is modified. The current levels of precision in lepton g-2 are mentioned

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