Search for Dark-Matter-Nucleon Interactions via Migdal Effect with DarkSide-50

(DarkSide Collaboration)

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Dark matter elastic scattering off nuclei can result in the excitation and ionization of the recoiling atom through the so-called Migdal effect. The energy deposition from the ionization electron adds to the energy deposited by the recoiling nuclear system and allows for the detection of interactions of sub-GeV/c2 mass dark matter. We present new constraints for sub-GeV/c2 dark matter using the dual-phase liquid argon time projection chamber of the DarkSide-50 experiment with an exposure of (12 306±184) kg d. The analysis is based on the ionization signal alone and significantly enhances the sensitivity of DarkSide-50, enabling sensitivity to dark matter with masses down to 40 MeV/c2. Furthermore, it sets the most stringent upper limit on the spin independent dark matter nucleon cross section for masses below 3.6 GeV/c2.

Original languageEnglish (US)
Article number101001
JournalPhysical review letters
Volume130
Issue number10
DOIs
StatePublished - Mar 10 2023
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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