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arXiv physics/0410057physics.atom-ph
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类氢原子双光子衰变宽度的自能修正

Self-Energy Correction to the Two-Photon Decay Width in Hydrogenlike Atoms

U. D. Jentschura

摘要:

研究了类氢原子双光子衰变宽度的超前对数辐射修正的规范不变性。它示出,一个有效的治疗使用兰姆移位“潜在”的校正导致等效的结果,在长度以及速度计提供的所有相关的校正项被考虑在内。具体地说,相关的辐射修正与进入传播子的能量、哈密顿量、波函数以及两个光子之间的能量守恒条件有关;所有这些效应的形式在两个规范中是不同的,但最终的结果被证明是规范不变的,这是应该的。虽然实际的计算只涉及非相对论性类氢格林函数的积分,但导出主导对数修正可以被认为比其他典型的对数项稍微复杂一些。对2S双光子衰变宽度的主要辐射修正为-2.020536(alpha/pi)(Zalpha)^2 ln[(Zalpha)^-2],单位为主导非相对论表达式。这一结果与长度规计算[S. G. Karshenboim和V.G. Ivanov,e-print physics/9702027],其中系数被给出为-2.025(1)。

英文摘要:

We investigate the gauge invariance of the leading logarithmic radiative correction to the two-photon decay width in hydrogenlike atoms. It is shown that an effective treatment of the correction using a Lamb-shift "potential" leads to equivalent results in both the length as well as the velocity gauges provided all relevant correction terms are taken into account. Specifically, the relevant radiative corrections are related to the energies that enter into the propagator denominators, to the Hamiltonian, to the wave functions, and to the energy conservation condition that holds between the two photons; the form of all of these effects is different in the two gauges, but the final result is shown to be gauge invariant, as it should be. Although the actual calculation only involves integrations over nonrelativistic hydrogenic Green functions, the derivation of the leading logarithmic correction can be regarded as slightly more complex than that of other typical logarithmic terms. The dominant radiative correction to the 2S two-photon decay width is found to be -2.020536 (alpha/pi) (Zalpha)^2 ln[(Zalpha)^-2] in units of the leading nonrelativistic expression. This result is in agreement with a length-gauge calculation [S. G. Karshenboim and V. G. Ivanov, e-print physics/9702027], where the coefficient was given as -2.025(1).

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