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D.SkorokhvatovSmirnov, O.O.SmirnovSotnikov, A.A.SotnikovStanford, C.C.StanfordStracka, S.S.StrackaSuffritti, G. B.G. B.SuffrittiSuvorov, Y.Y.SuvorovTartaglia, R.R.TartagliaTestera, G.G.TesteraTonazzo, A.A.TonazzoTrinchese, P.P.TrincheseUnzhakov, E. V.E. V.UnzhakovVerducci, M.M.VerducciVishneva, A.A.VishnevaVogelaar, B.B.VogelaarWada, M.M.WadaWaldrop, T. J.T. J.WaldropWang, H.H.WangWang, Y.Y.WangWatson, A. W.A. W.WatsonWesterdale, S.S.WesterdaleWojcik, M. M.M. M.WojcikWojcik, M.M.WojcikXiang, X.X.XiangXiao, X.X.XiaoYang, C.C.YangYe, Z.Z.YeZhu, C.C.ZhuZichichi, A.A.ZichichiZuzel, G.G.ZuzelDarkSide Collaboration2020-10-062020-10-0620180031-9007http://hdl.handle.net/20.500.12386/27620We 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 .STAMPAenArticle10.1103/PhysRevLett.121.1113032-s2.0-85053343618000444588900004https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.1113032018PhRvL.121k1303AFIS/04 - FISICA NUCLEARE E SUBNUCLEARE