Department of Physics, St. Petersburg State University, Universitetskaya 7/9, 199034 St. Petersburg, Russia.
Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany.
Phys Rev Lett. 2019 Oct 25;123(17):173001. doi: 10.1103/PhysRevLett.123.173001.
The recently established agreement between experiment and theory for the g factors of lithiumlike silicon and calcium ions manifests the most stringent test of the many-electron bound-state quantum electrodynamics (QED) effects in the presence of a magnetic field. In this Letter, we present a significant simultaneous improvement of both theoretical g_{th}=2.000 889 894 4 (34) and experimental g_{exp}=2.000 889 888 45 (14) values of the g factor of lithiumlike silicon ^{28}Si^{11+}. The theoretical precision now is limited by the many-electron two-loop contributions of the bound-state QED. The experimental value is accurate enough to test these contributions on a few percent level.
最近在实验和理论之间达成的关于类锂离子硅和钙离子 g 因子的协议，展示了在磁场存在下多电子束缚态量子电动力学（QED）效应最严格的检验。在这封信件中，我们同时显著地改进了理论 g_{th}=2.000 889 894 4 (34) 和实验 g_{exp}=2.000 889 888 45 (14) 值，即类锂离子 ^{28}Si^{11+} 的 g 因子。目前理论的精度受到束缚态 QED 的多电子两圈贡献的限制。实验值的精度足以在百分之几的水平上检验这些贡献。
