2010/12/31 by Panying Chen, Xiangdong Ji, Yue Zhang
Physics and Astronomy · #Angular momentum #Angular momentum coupling #Angular momentum of light #Angular momentum operator #Atomic and Molecular Physics #Compact operator #Cutoff #Ladder operator #Momentum operator #Operator (biology) #Orbital angular momentum of light #Particle physics theoretical and experimental studies #Photon #Physics #Quantum Chromodynamics and Particle Interactions #Quantum electrodynamics #Quantum mechanics #Regularization (linguistics) #Spin (aerodynamics) #Total angular momentum quantum number #hep-ph
paper · pdf · doi:10.1007/jhep02(2011)107
published in Journal of High Energy Physics 2011(2) (Springer Nature) · 23 pages, 6 figures, 2 tables; published version
openalex publication_date 2011/02/01 · arxiv created 2011/03/03 · arxiv updated 2011/03/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.