Constraints on a long-range spin-dependent interaction from precision atomic physics
Karshenboim, S. G.
Original · EN
We present a phenomenological constraint on a pseudovector light boson beyond the Standard Model, which can induce a long-range spin-dependent interaction α′′(s₁· s₂) e⁻λʳ/r. In the range of masses from 4 keV/c² to those related to macroscopic distances (of λ⁻¹ 1cm) the spin-dependent coupling constant α′′ of the electron-muon interaction is constrained at the level below a part in 10¹⁵. The constraint is weakened while extending to higher masses. The strongest constraint is related to the lepton-lepton interaction. Constraints on spin-dependent interactions of some other particles are also discussed. The results are obtained from data on the HFS interval of the ground state in muonium and a few other light hydrogen-like atoms.
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