Pair absorption of two dark matter particles in atomic transitions can probe electroweak-scale couplings of mu-eV-to-eV mass bosonic dark matter, and could bound the cosmic neutrino background overdensity near 10^9.
Detecting Boosted Dark Photons with Gaseous Detectors
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abstract
We search for indirect signals of $\mathscr{O}$(keV) dark matter annihilating or decaying into $\mathscr{O}$(eV) dark photons. These dark photons will be highly boosted and have decay lengths larger than the Milky Way, and can be absorbed by neutrino or dark matter experiments at a rate dependent on the photon-dark photon kinetic mixing parameter and the optical properties of the experiment. We show that current experiments can not probe new parameter space, but future large-scale gaseous detectors with low backgrounds (i.e. CYGNUS, NEXT, PANDAX-III) may be sensitive to this signal when the annihilation cross section is especially large.
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Dark matter pair absorption
Pair absorption of two dark matter particles in atomic transitions can probe electroweak-scale couplings of mu-eV-to-eV mass bosonic dark matter, and could bound the cosmic neutrino background overdensity near 10^9.