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

P. Agnes et al. (The DarkSide Collaboration)
Phys. Rev. Lett. 121, 111303 – Published 12 September 2018

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 100MeV/c2.

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  • Received 15 May 2018
  • Revised 16 July 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.111303

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Particles & FieldsGravitation, Cosmology & Astrophysics

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Vol. 121, Iss. 11 — 14 September 2018

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