Hannover 2020 – wissenschaftliches Programm

Die DPG-Frühjahrstagung in Hannover musste abgesagt werden! Lesen Sie mehr ...

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

A: Fachverband Atomphysik

A 15: Precision spectroscopy of atoms and ions II

A 15.7: Vortrag

Mittwoch, 11. März 2020, 12:45–13:00, f107

The g factor of bound electrons as a probe for physics beyond the Standard Model — •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 computed and, when compared to existing and projected 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 on the g factor. We also use data on the 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 furtherance 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, in order to obtain bounds on proposed new forces. By carefully considering subleading nuclear corrections to the g factor, our treatment allows for the precise interpretation of isotope shift data. We also combine the isotope shift with the above-mentioned weighted difference, which yields competitive bounds [V. Debierre et al., arXiv:1901.06959].