At one loop in covariant-gauge QED, the electron's fermionic spin acquires the -α/(2π) correction, while the five canonical angular momentum components sum to the tree-level total spin of one-half.
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Angular momentum of the electron: One-loop studies
At one loop in covariant-gauge QED, the electron's fermionic spin acquires the -α/(2π) correction, while the five canonical angular momentum components sum to the tree-level total spin of one-half.