Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 46: Precision Spectroscopy of Atoms and Ions IV (joint session A/Q)
Q 46.1: Vortrag
Mittwoch, 12. März 2025, 14:30–14:45, KlHS Mathe
Fifth-force searches with the bound-electron g factor — •Zoltan Harman — Max Planck Institute for Nuclear Physics, Heidelberg, Germany
High-precision measurements of the g factor of one- and few-electron ions and its isotope shifts offer a promising avenue for probing beyond-Standard-Model (BSM) physics [1].
By calculating the potential contribution of a hypothetical new force to the g-factor of H-like, Li-like, and B-like ions, we can derive constraints on the parameters of such a force. This approach leverages the advanced theoretical calculations of QED contributions to the bound-electron g-factor [2,3].
To enhance sensitivity to new physics, we focus on the weighted difference and, especially, the isotope shift of g-factors. We have found that a recent Penning-trap measurement of the isotopic shift of the g factors in 20Ne9+ and 22Ne9+ to sub-parts-per-trillion precision present a compelling alternative for setting bounds on BSM interactions [4]. Moreover, combining measurements from different isotopes of H-like, Li-like and B-like ions [1] at accuracy levels projected to be accessible in the near future, experimental results would constrain the new physics coupling constant further than the best current spectroscopic data and theory. –
[1] V. Debierre, C. H. Keitel, Z. Harman, Phys. Lett. B 807, 135527 (2020);
[2] J. Morgner, B. Tu, C. M. König, et al., Nature 622, 53 (2023);
[3] B. Sikora, V. A. Yerokhin, C. H. Keitel, Z. Harman, arXiv:2410.10421 (2024);
[4] T. Sailer, V. Debierre, Z. Harman, et al., Nature 606, 479 (2022).
Keywords: highly charged ions; BSM physics; g factor; quantum electrodynamics