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Constraints on Sub-GeV Dark-Matter-Electron Scattering from the DarkSide-50 Experiment

Agnes, P
Albuquerque, IFM
Alexander, T
Alton, AK
Araujo, GR
Asner, DM
Ave, M
Back, HO
Baldin, B
Batignani, G
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Pre-print
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2018-09-12
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10.1103/PhysRevLett.121.111303
Abstract
© 2018 American Physical Society. We present new constraints on sub-GeV dark-matter particles scattering off electrons based on 6780.0 kg d of data collected with the DarkSide-50 dual-phase argon time projection chamber. This analysis uses electroluminescence signals due to ionized electrons extracted from the liquid argon target. The detector has a very high trigger probability for these signals, allowing for an analysis threshold of three extracted electrons, or approximately 0.05 keVee. We calculate the expected recoil spectra for dark matter-electron scattering in argon and, under the assumption of momentum-independent scattering, improve upon existing limits from XENON10 for dark-matter particles with masses between 30 and 100 MeV/c2.
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Physical Review Letters
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