Rostock 2019 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 35: Precision Spectroscopy of atoms and ions
A 35.11: Poster
Donnerstag, 14. März 2019, 16:15–18:15, S Fobau Physik
Two-loop self-energy corrections 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 calculations of the two-loop self-energy correction to the bound-electron g-factor. This correction currently gives rise to the largest uncertainty of theoretical g-factor predictions. We have obtained full results for the loop-after-loop diagrams, and partial results for the nested and overlapping loop diagrams, in which we treat the Coulomb interaction in intermediate states to zero and first order.
Our results will be highly relevant for planned g-factor measurements with high-Z ions in the near future as well as for an independent determination of the fine-structure constant α from the bound-electron g-factor.– [1] B. Sikora, V. A. Yerokhin, N. S. Oreshkina et al., arXiv:1804.05733v1 [physics.atom-ph] (2018).