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  • Search for dark matter-nucleon interactions via Migdal effect with DarkSide-50
    The DarkSide-50 Collaboration; Agnes, P; Alton, A K; Back, H O; Batignani, G; Biery, K; Bonivento, W M; Bussino, S; Cadeddu, M; Calaprice, F; Campos, M D; Canci, N; Carlini, M; Carpinelli, M; Cavalcante, P; Chashin, S; Chepurnov, A; Cicalò, C; D'Angelo, D; Davini, S; De Candia, A; De Cecco, S; De Rosa, G; Derbin, A V; D'Incecco, M; Dordei, F; Downing, M; D'Urso, D; Fairbairn, M; Fiorillo, G; Gabriele, F; Galbiati, C; Giganti, C; Giovanetti, G K; G Grilli di Cortona; Gromov, M; Guan, M; Hackett, B R; Herner, K; Hessel, T; Hosseini, B; Hubaut, F; Hungerford, E V; Ianni, An; Ippolito, V; Keeter, K; Kendziora, C L; Kimura, M; Kochanek, I; Korga, G; Kuss, M; La Commara, M; Lai, M; X Li; Lissia, M; Machulin, I N; Mapelli, L P; Milincic, R; Morrocchi, M; Mougeot, X; Nozdrina, A O; Ortica, F; Pallavicini, M; Pandola, L; Paoloni, E; Pelczar, K; Pelliccia, N; Picciau, E; Pocar, A; Poehlmann, D M; Pordes, S; Poudel, S S; Pralavorio, P; Ragusa, F; Razeti, M; Razeto, A; Rescigno, M; Rode, J; Romani, A; Samoylov, O; Sands, W; Sanford, E; Schlitzer, B; Semenov, D A; Sheshukov, A; Skorokhvatov, M D; Smirnov, O; Sotnikov, A; Stracka, S; Tartaglia, R; Testera, G; Tonazzo, A; Unzhakov, E V; Vishneva, A; Vogelaar, R B; Wada, M; Wang, Y; Wojcik, M M; Yang, C; Zuzel, G

    arXiv.org, 02/2023
    Paper, Journal Article

    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/c\(^2\) mass dark matter. We present new constraints for sub-GeV/c\(^2\) dark matter using the dual-phase liquid argon time projection chamber of the DarkSide-50 experiment with an exposure of (12306 \(\pm\) 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/c\(^2\). Furthermore, it sets the most stringent upper limit on the spin independent dark matter nucleon cross section for masses below \(3.6\) GeV/c\(^2\).

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