The electron's field angular momentum is finite at one-loop order in QED, but the computed value depends on the regularization scheme: -s_z α/(3π) with a 3D cutoff versus -s_z α/(2π) with Pauli-Villars.
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Electromagnetic angular momentum of the electron: One-loop studies
The electron's field angular momentum is finite at one-loop order in QED, but the computed value depends on the regularization scheme: -s_z α/(3π) with a 3D cutoff versus -s_z α/(2π) with Pauli-Villars.