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

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 $10^{-2}\mathrm{eV}\lesssim m\lesssim 10^4\mathrm{eV}$ 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.

References in corpus (1)

• Spin-Dependent Macroscopic Forces from New Particle Exchange

Cited by in corpus (4)

• Probing new spin-independent interactions through precision spectroscopy in atoms with few electrons
• Experimental limit on an exotic parity-odd spin- and velocity-dependent interaction using an optically polarized vapor
• Anomalies in ${}^8$Be nuclear transitions and $(g-2{)}_{e,\mu }$: towards a minimal combined explanation
• Atomic properties of actinide ions with particle-hole configurations