Mainz 2026 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 13: Highly Charged Ions and their Applications II
A 13.3: Vortrag
Dienstag, 3. März 2026, 11:45–12:00, N 25
Stringent Constraints on New Pseudoscalar & Vector Bosons from Precision Hyperfine Splitting Measurements — •Cedric Quint1, Fabian Heiße1, Joerg Jaeckel2, Lutz Leimenstoll2, Christoph H. Keitel1, and Zoltán Harman1 — 1Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, 69117 Heidelberg — 2Insitute for Theoretical Physics, Philosophenweg 16, 69120 Heidelberg
Axion-like 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 hydrogen- and lithium-like 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, improving upon existing constraints
by up to a factor of 2 for pseudoscalar couplings. 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.
Reference: 2506.03274
Keywords: New Physics; Hyperfine Structure; Specific Difference