Absorption of Sub-MeV Fermionic Dark Matter by Electron Targets

Abstract

We study a new class of signals where fermionic dark matter is absorbed by bound electron targets. Fermionic absorption signals in direct detection and neutrino experiments are sensitive to dark matter with sub-MeV mass, probing a region of parameter space in which dark matter is otherwise challenging to detect. We calculate the rate and energy deposition spectrum in xenon-based detectors, making projections for current and future experiments. We present two possible models that display fermionic absorption by electrons and study the detection prospects in light of other constraints.

arXiv comment8+4 pages, 5 figures; v3: corrected decay rate expressions and figures; conclusions unchanged

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