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

The DarkSide Collaboration

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Abstract

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.

Original languageEnglish (US)
Article number111303
JournalPhysical review letters
Volume121
Issue number11
DOIs
StatePublished - Sep 12 2018

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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