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arXiv · 1903.11609

$g$ Factor of Lithiumlike Silicon: New Challenge to Bound-State QED

D. A. Glazov·F. Köhler-Langes·A. V. Volotka·F. Heiße·K. Blaum·G. Plunien·W. Quint·V. M. Shabaev·S. Sturm·G. Werth
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Abstract

The recently established agreement between experiment and theory for the $g$ factors of lithiumlike silicon and calcium ions manifests the most stringent test of the many-electron bound-state quantum electrodynamics (QED) effects in the presence of a magnetic field. In this Letter, we present a significant simultaneous improvement of both theoretical $g_\text{th} = 2.000\,889\,894\,4\,(34)$ and experimental $g_\text{exp} = 2.000\,889\,888\,45\,(14)$ values of the $g$ factor of lithiumlike silicon $^{28}$Si$^{11+}$. The theoretical precision now is limited by the many-electron two-loop contributions of the bound-state QED. The experimental value is accurate enough to test these contributions on a few percent level.

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D. A. Glazov, F. Köhler-Langes, A. V. Volotka, F. Heiße, K. Blaum, G. Plunien, W. Quint, V. M. Shabaev, S. Sturm, G. Werth. 2019-03-27. $g$ Factor of Lithiumlike Silicon: New Challenge to Bound-State QED. https://doi.org/10.1103/physrevlett.123.173001

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