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The very high precision of current measurements and theory predictions ofspectral lines in few-electron atoms allows to efficiently probe the existenceof exotic forces between electrons, neutrons and protons. We investigate thesensitivity to new spin-independent interactions in transition frequencies (andtheir isotopic shifts) of hydrogen, helium and some helium-like ions. We findthat present data probe new regions of the force-carrier couplings to electronsand neutrons around the MeV mass range. We also find that, below few keV, thesensitivity to the electron coupling in precision spectroscopy of helium andpositronium is comparable to that of the anomalous magnetic moment of theelectron. Finally, we interpret our results in the dark-photon model where anew gauge boson is kinetically mixed with the photon. There, we show thathelium transitions, combined with the anomalous magnetic moment of theelectron, provide the strongest indirect bound from laboratory experimentsabove 100keV.

Probing new spin-independent interactions through precision spectroscopy in atoms with few electrons