Low-Mass Dark Matter Search with the DarkSide-50 Experiment

We present the results of a search for dark matter WIMPs in the mass range below 20 GeV/c^2 using a target of low-radioactivity argon. The data were obtained using the DarkSide-50 apparatus at Laboratori Nazionali del Gran Sasso (LNGS). The analysis is based on the ionization signal, for which the D...

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Published in:arXiv.org 2018-08
Main Authors: The DarkSide Collaboration, Agnes, P, Alexander, T, Alton, A K, Asner, D M, Biery, K, Bottino, B, Budano, F, Cadoni, M, Calaprice, F, Caminata, A, Caravati, M, Cariello, M, Cavalcante, P, Cereseto, R, Chepurnov, A, Cicalò, C, Cifarelli, L, D'Angelo, D, D'Incecco, M, D'Urso, D, De Candia, A, De Cecco, S, De Deo, M, De Vincenzi, M, Devoto, A, F Di Eusanio, G Di Pietro, Dionisi, C, Downing, M, Fan, A, Fiorillo, G, Fomenko, K, Gabriele, F, P Garcia Abia, Ghiano, C, Giganti, C, Gorchakov, O, Granato, F, Gromov, M, Guan, M, Gulino, M, Hughes, D, Humble, P, Ianni, Al, Ianni, An, Kochanek, I, Koh, G, Korablev, D, Kubankin, A, La Commara, M, Y Ma, Machulin, I N, Mari, S M, Maricic, J, Messina, A, Meyers, P D, Milincic, R, Mount, B J, Musico, P, Ortica, F, Pagani, L, Pallavicini, M, Pandola, L, Pantic, E, Pazzona, F, Pelliccia, N, Pesudo, V, Poudel, S S, Ragusa, F, Razeto, A, Rescigno, M, Riffard, Q, Sablone, D, Samoylov, O, Sanfilippo, S, Sant, M, Santorelli, R, Savarese, C, Schlitzer, B, Semenov, D A, Skorokhvatov, M D, Smirnov, O, Sotnikov, A, Stracka, S, Suvorov, Y, Tartaglia, R, Tonazzo, A, Trinchese, P, Verducci, M, Wang, Y, Watson, A W, Westerdale, S, Wojcik, M, Xiao, X, Yang, C, Z Ye, Zhu, C, Zichichi, A, Zuzel, G
Format: Article
Language:English
Subjects:
Argon
Dark matter
Ionization
Nucleons
Radiation counters
Radioactivity
Weakly interacting massive particles
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Summary:We present the results of a search for dark matter WIMPs in the mass range below 20 GeV/c^2 using a target of low-radioactivity argon. The data were obtained using the DarkSide-50 apparatus at Laboratori Nazionali del Gran Sasso (LNGS). The analysis is based on the ionization signal, for which the DarkSide-50 time projection chamber is fully efficient at 0.1 keVee. The observed rate in the detector at 0.5 keVee is about 1.5 events/keVee/kg/day and is almost entirely accounted for by known background sources. We obtain a 90% C.L. exclusion limit above 1.8 GeV/c^2 for the spin-independent cross section of dark matter WIMPs on nucleons, extending the exclusion region for dark matter below previous limits in the range 1.8-6 GeV/c^2.
ISSN:2331-8422
DOI:10.48550/arxiv.1802.06994