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 / c^2 .
Constraints on Sub-GeV Dark-Matter-Electron Scattering from the DarkSide-50 Experiment / Agnes, P., Albuquerque, I.F.M., Alexander, T., Alton, A.K., Araujo, G.R., Asner, D.M., Ave, M., Back, H.O., Baldin, B., Batignani, G., Biery, K., Bocci, V., Bonfini, G., Bonivento, W., Bottino, B., Budano, F., Bussino, S., Cadeddu, M., Cadoni, M., Calaprice, F., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 121:111303(2018), pp. 1-7. [10.1103/PhysRevLett.121.111303]
Constraints on Sub-GeV Dark-Matter-Electron Scattering from the DarkSide-50 Experiment
Cataudella, V.;Cavuoti, S.Membro del Collaboration Group
;Covone, G.;De Candia, A.;De Filippis, G.Membro del Collaboration Group
;De Rosa, G.;Fiorillo, G.;La Commara, M.;Longo, G.;Suvorov, Y.;
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 100 MeV / c^2 .I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.


