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A: Fachverband Atomphysik

A 10: Highly charged ions and their applications

A 10.5: Hauptvortrag

Montag, 11. März 2019, 17:15–17:45, S HS 3 Physik

Towards testing physics beyond the Standard Model with the bound-electron g factor — •Vincent Debierre, Christoph H. Keitel, and Zoltán Harman — Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg

We demonstrate the relevance of the g factor of bound electrons in few-electron ions to the search for physics beyond the Standard Model (SM). The contribution to the g factor from hypothetical forces beyond the SM can be calculated and, when compared to existing and potential experimental data, used to derive competitive bounds on the parameters of these forces.

A first method to implement this program consists in comparing the best available theoretical and experimental results, including data on the weighted difference of g factors of different electronic levels [V.A. Yerokhin et al., Phys. Rev. Lett. 116, 100801 (2016)]. Stringent bounds can be obtained in the future with this method, through the ongoing advancement of bound-state QED calculations at the two-loop level.

Another method makes use of the isotope shift. Inspired by a recent proposal concerning optical frequencies in ions [J.C. Berengut et al., Phys. Rev. Lett. 120, 091801 (2018)], we propose to use precision spectroscopy of the isotope shifts in the g factor of few-electron ions, to obtain bounds on a hypothetical fifth fundamental force. This method is based on experimental King plots, which are built from isotope shift data. By carefully considering subleading nuclear corrections to the g factor, our treatment allows for the precise interpretation of King plots.