Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 19: Precision Spectroscopy of Atoms and Ions II (joint session A/Q)
A 19.7: Talk
Wednesday, March 13, 2024, 12:30–12:45, HS 1098
Tests of QED with hydrogenlike helium and tin ions and high-precision theory of the bound-electron g-factor — •Bastian Sikora, Vladimir A. Yerokhin, Zoltan Harman, and Christoph H. Keitel — Max Planck Institute for Nuclear Physics, Heidelberg, Germany
The g-factor of electrons bound in hydrogenlike ions can be measured and calculated with high accuracy. In recent collaborations, the experimental and theoretical g-factors of the bound electron in hydrogenlike 3He+ and 118Sn49+ ions were found to be in excellent agreement [1,2]. We present the theory of the bound-electron g-factor of hydrogenlike ions, as well as the status of two-loop QED calculations aimed to improve the uncertainty of theoretical bound-electron g-factors in the high-Z regime [3]. Such calculations will enable improved tests of QED in planned experiments in the near future and are relevant for the determination of fundamental constants such as the electron mass or the fine-structure constant α as well as searches for physics beyond the standard model.
[1] A. Schneider, B. Sikora, S. Dickopf, et al., Nature 606, 878 (2022)
[2] J. Morgner, B. Tu, C. M. König, et al., Nature 622, 53 (2023)
[3] B. Sikora, V. A. Yerokhin, N. S. Oreshkina, et al., Phys. Rev. Research 2, 012002(R) (2020)
Keywords: QED tests; Two-loop calculations; Bound-electron $g$-factor