Constraints on Light Dark Matter Particles Interacting with Electrons from DAMIC at SNOLAB

Abstract

We report direct-detection constraints on light dark matter particles interacting with electrons. The results are based on a method that exploits the extremely low levels of leakage current of the DAMIC detector at SNOLAB of 2-6$\times$10${}^{-22}$ A cm${}^{-2}$. We evaluate the charge distribution of pixels that collect $<10{\mathrm{e}}^{-}$ for contributions beyond the leakage current that may be attributed to dark matter interactions. Constraints are placed on so-far unexplored parameter space for dark matter masses between 0.6 and 100 MeV$c^{-2}$. We also present new constraints on hidden-photon dark matter with masses in the range $1.2$-$30$ eV$c^{-2}$.

arXiv comment6 pages, 4 figures

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