Positronium energy levels at order m α 7 : Product contributions in the two-photon-annihilation channel
Positronium energy levels at order m α 7 : Product contributions in the two-photon-annihilation channel
复制标题
m α 7 阶正电子能级：双光子湮灭通道中的产物贡献
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Ruihan Wang
中科院分区：
文献类型：
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作者：
G. Adkins;Lam M. Tran;Ruihan Wang
Ongoing improvements in the measurement of positronium transition intervals motivate the calculation of the $O(m{ensuremath{alpha}}^{7})$ corrections to these intervals. In this work we focus on corrections to the spin-singlet parapositronium energies involving virtual annihilation to two photons in an intermediate state. We have evaluated all contributions to the positronium $S$-state energy levels that can be written as the product of a one-loop correction on one side of the annihilation event and another one-loop correction on the other side. These effects contribute $mathrm{ensuremath{Delta}}E=ensuremath{-}0.561971(25)m{ensuremath{alpha}}^{7}/{ensuremath{pi}}^{3}$ to the parapositronium ground-state energy.
Ongoing improvements in the measurement of positronium transition intervals motivate the calculation of the $O(m{ensuremath{alpha}}^{7})$ corrections to these intervals. In this work we focus on corrections to the spin-singlet parapositronium energies involving virtual annihilation to two photons in an intermediate state. We have evaluated all contributions to the positronium $S$-state energy levels that can be written as the product of a one-loop correction on one side of the annihilation event and another one-loop correction on the other side. These effects contribute $mathrm{ensuremath{Delta}}E=ensuremath{-}0.561971(25)m{ensuremath{alpha}}^{7}/{ensuremath{pi}}^{3}$ to the parapositronium ground-state energy.