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arXiv 0904.0835hep-ph
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束缚电子g因子的束缚双圈真空极化修正

Binding two-loop vacuum-polarization corrections to the bound-electron g factor

U. D. Jentschura

摘要:

我们开始计算α ^2(Z α)级类氢系统中电子对g因子的单圈和双圈束缚修正,并考虑具有闭合费米子圈的图。重新推导并证实了单圈真空极化修正。对于双圈真空极化校正,由于有一组特定的规范不变的闭合费米子圈图,我们发现校正δ g = 7. 442(α/π)^2(Z α)^5。基于从规范不变子集推断出的系数的数值趋势,我们得到了对g因子(自能和真空极化之和)的完全双圈束缚修正的数值大的尝试性估计。

英文摘要:

We commence the evaluation of the one- and two-loop binding corrections to the $g factor for an electron in a hydrogenlike system of order alpha^2 (Z alpha)^5 and consider diagrams with closed fermion loops. The one-loop vacuum-polarization correction is rederived and confirmed. For the two-loop vacuum-polarization correction, due to a specific gauge-invariant set of diagrams with closed fermion loops, we find a correction delta g = 7.442 (alpha/pi)^2 (Z alpha)^5. Based on the numerical trend of the coefficients inferred from the gauge-invariant subset, we obtain a numerically large tentative estimate for the complete two-loop binding correction to the g factor (sum of self-energy and vacuum polarization).

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