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arxiv 1608.05779 v2 pith:5LN7MU5P submitted 2016-08-20 physics.atom-ph hep-ph

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

classification physics.atom-ph hep-ph
keywords interactionsconstraintsexoticdipole-dipoleelectronslesssimspin-dependentagreement
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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