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

MPS-Authors
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Köhler-Langes,  F.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Blaum,  K.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Heiße,  F.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Rau,  S.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Sturm,  S.
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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1903.11609.pdf
(Preprint), 276KB

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Citation

Glazov, D. A., Köhler-Langes, F., Volotka, A. V., Blaum, K., Heiße, F., Plunien, G., et al. (2019). g Factor of Lithiumlike Silicon: New Challenge to Bound-State QED. Physical Review Letters, 123(17): 173001. doi:10.1103/PhysRevLett.123.173001.

Cite as: http://hdl.handle.net/21.11116/0000-0004-EBC0-A
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.