Do direct detection experiments constrain axionlike particles coupled to electrons?

Abstract

Several laboratory experiments have published limits on axionlike particles (ALPs) with feeble couplings to electrons and masses in the keV-MeV range, under the assumption that such ALPs comprise the dark matter. We note that ALPs decay radiatively into photons, and show that for a large subset of the parameter space ostensibly probed by these experiments, the lifetime of the ALPs is shorter than the age of the universe. Such ALPs cannot consistently make up the dark matter, which significantly affects the interpretation of published limits from GERDA, Edelweiss-III, SuperCDMS and Majorana. Moreover, constraints from gamma-ray and X-ray astronomy exclude an even wider range of the ALP-electron coupling, and supersede all current experimental limits on dark matter ALPs in the 6 keV to 1 MeV mass range. These conclusions are rather model-independent, and can only be avoided at the expense of significant fine-tuning in theories where the ALP has additional couplings to other particles.

4 pages, 2 figures. v2: references added, typos corrected (results unchanged)

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Cited by in corpus (7)

• Search for dark matter particle interactions with electron final states with DarkSide-50
• Strong supernovae bounds on ALPs from quantum loops
• Proto-neutron stars as cosmic factories for massive axion-like-particles
• Constraints on light decaying dark matter candidates from 16 years of INTEGRAL/SPI observations
• Probing a light dark sector at future lepton colliders via invisible decays of the SM-like and dark Higgs bosons
• Exotic dark matter search with the Majorana Demonstrator
• Inverse Primakoff Scattering for Axionlike Particle Coupling