Effective Angular Momentum Operators in NRQED and Matching at One-Loop Order
Chen, Panying · Ji, Xiangdong · Zhang, Yue
Original · EN
We derive the effective angular momentum operator to 1/m² and one-loop order in non-relativistic quantum electrodynamics (NRQED). In both dimensional and three-momentum-cutoff regularization schemes, we obtain the non-relativistic expansion for the spin and orbital angular momentum operators of the electron and photon, respectively. Our result is useful in precision calculations of the angular momentum properties for non-relativistic QED bound states, such as atom systems.
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