One more hard three-loop correction to parapositronium energy levels
One more hard three-loop correction to parapositronium energy levels
复制标题
对正电子素能级的又一硬三环校正
DOI:
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发表时间:
2017
期刊:
影响因子:
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通讯作者:
V. Shelyuto
中科院分区:
文献类型:
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作者:
M. I. Eides;V. Shelyuto
A hard three-loop correction to parapositronium energy levels of order $malpha^7$ is calculated. This nonlogarithmic contribution is due to the insertions of one-loop photon propagator in the fermion lines in the diagrams with virtual two-photon annihilation. We obtained $Delta E=0.03297(2)(malpha^7/pi^3)$ for this energy shift.