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Where does the number 197 in the electron g-factor come from?

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As Kinoshita writes in several of his papers, the second-order term of the anomalous g-factor of the electron, the term proportional to $(\alpha/\pi)^2$, contains the fraction 197/144 (as well as other expressions).

Is a simple explanation for the bizarre number 197 possible?

asked May 9 in Theoretical Physics by Bernard [ no revision ]

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