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Spin decomposition of the electron in QED

Ji, Xiangdong ; Schäfer, Andreas ; Yuan, Feng ; Zhang, Jian-Hui ; Zhao, Yong


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 agree 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 ...


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