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Stringent constraints on new pseudoscalar and vector bosons from precision hyperfine splitting measurements

Axionlike particles and similar new pseudoscalar as well as vector bosons coupled to nucleons and electrons are predicted to lead to spin-dependent forces in atoms and ions. We argue that hyperfine structure measurements in hydrogenlike and lithiumlike charge states are a sensitive probe to this eff...

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Bibliographic Details
Main Authors: Quint, Cedric (Author) , Heiße, Fabian (Author) , Jaeckel, Joerg (Author) , Leimenstoll, Lutz (Author) , Keitel, Christoph H. (Author) , Harman, Zoltán (Author)
Format: Article (Journal)
Language:English
Published: 19 March, 2026
In: Physical review letters
Year: 2026, Volume: 136, Issue: 11, Pages: 1-9
ISSN:1079-7114
DOI:10.1103/rvt1-93v2
Online Access:Resolving-System, kostenfrei, Volltext: https://doi.org/10.1103/rvt1-93v2
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/rvt1-93v2
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Author Notes:Cedric Quint, Fabian Heiße, Joerg Jaeckel, Lutz Leimenstoll, Christoph H. Keitel, and Zoltán Harman
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Summary:Axionlike particles and similar new pseudoscalar as well as vector bosons coupled to nucleons and electrons are predicted to lead to spin-dependent forces in atoms and ions. We argue that hyperfine structure measurements in hydrogenlike and lithiumlike charge states are a sensitive probe to this effect. Employing specific differences of these splittings reduces uncertainties due to nuclear effects in hyperfine structure calculations and measurements. Using this, we show that existing measurements on Be provide competitive limits in the region 𝑚𝜙≳100 keV, confirming, or improving by up to a factor of 2, existing constraints for pseudoscalar couplings, depending on the nuclear model. We also find that future measurements on Cs have a further factor of 2-2.5 improved discovery potential for pseudoscalars and an order of magnitude for new vector bosons when compared with the corresponding current constraints.
Item Description:Gesehen am 29.05.2026
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/rvt1-93v2

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