Spin Decomposition of Electron in QED
arXiv:1511.08817 · doi:10.1103/PhysRevD.93.054013
Abstract
We perform a systematic study on the spin decomposition of an electron in QED at one-loop order. It is found that the electron orbital angular momentum defined in Jaffe-Manohar and Ji spin sum rules agrees with each other, and the so-called potential angular momentum vanishes at this order. The calculations are performed in both dimensional regularization and Pauli-Villars regularization for the ultraviolet divergences, and they lead to consistent results. We further investigate the calculations in terms of light-front wave functions, and find a missing contribution from the instantaneous interaction in light-front quantization. This clarifies the confusing issues raised recently in the literature on the spin decomposition of an electron, and will help to consolidate the spin physics program for nucleons in QCD.
8 pages
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- Angular Momentum Distribution in the Transverse Plane
- QCD evolution of the orbital angular momentum of quarks and gluons: Genuine twist-three part
- Factorized approach to radiative corrections for inelastic lepton-hadron collisions
- Potential linear and angular momentum in the scalar diquark model
- Electromagnetic angular momentum of the electron: One-loop studies
- Mass sum rules of the electron in quantum electrodynamics
- Angular momentum of the electron: One-loop studies