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A: Fachverband Atomphysik
A 15: Precision spectroscopy of atoms and ions II
A 15.5: Vortrag
Mittwoch, 11. März 2020, 12:15–12:30, f107
Non-perturbative calculation of the two-loop self-energy contribution to the bound-electron g-factor — •Bastian Sikora1, Vladimir A. Yerokhin2, Natalia S. Oreshkina1, Halil Cakir1, Chrisoph H. Keitel1, and Zoltán Harman1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Center for Advanced Studies, Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia
We present the status of our ongoing calculation of the two-loop self-energy contribution to the bound-electron g-factor, which currently gives rise to the largest uncertainty of theoretical g-factor predictions. In our approach, the interaction between electron and nucleus is taken into account exactly. We have obtained full results for the loop-after-loop diagrams, and partial results for the nested and overlapping loop diagrams.
Our results will be highly relevant for g-factor measurements with high-Z ions as well as for an independent determination of the fine-structure constant α from the bound-electron g-factor in the near future.– [1] B. Sikora, V. A. Yerokhin, N. S. Oreshkina et al., in press, arXiv:1804.05733v1 [physics.atom-ph] (2018).