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arXiv · 1608.05779

Constraints on exotic spin-dependent interactions between electrons from helium fine-structure spectroscopy

Filip Ficek·Derek F. Jackson Kimball·Mikhail Kozlov·Nathan Leefer·Szymon Pustelny·Dmitry Budker
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Abstract

Agreement between theoretical calculations of atomic structure and spectroscopic measurements is used to constrain possible contribution of exotic spin-dependent interactions between electrons to the energy differences between states in helium-4. In particular, constraints on dipole-dipole interactions associated with the exchange of pseudoscalar bosons (such as axions or axion-like particles, ALPs) with masses $10^{-2}~{\rm eV} \lesssim m \lesssim 10^{4}~{\rm eV}$ are improved by a factor of $\sim 100$. The first atomic-scale constraints on several exotic velocity-dependent dipole-dipole interactions are established as well.

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Filip Ficek, Derek F. Jackson Kimball, Mikhail Kozlov, Nathan Leefer, Szymon Pustelny, Dmitry Budker. 2016-08-20. Constraints on exotic spin-dependent interactions between electrons from helium fine-structure spectroscopy. https://doi.org/10.1103/physreva.95.032505

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