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Spin Decomposition of Electron in QED

Authors
  • Ji, Xiangdong
  • Schäfer, Andreas
  • Yuan, Feng
  • Zhang, Jian-Hui
  • Zhao, Yong
Type
Published Article
Publication Date
Nov 27, 2015
Submission Date
Nov 27, 2015
Identifiers
DOI: 10.1103/PhysRevD.93.054013
Source
arXiv
License
Yellow
External links

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.

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