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Low-mass dark matter search with the DarkSide-50 experiment
Agnes, P Albuquerque, IFM Alexander, T Alton, AK Araujo, GR Asner, DM Ave, M Back, HO Baldin, B Batignani, G
Agnes, P
Albuquerque, IFM
Alexander, T
Alton, AK
Araujo, GR
Asner, DM
Ave, M
Back, HO
Baldin, B
Batignani, G
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Journal Article
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2018-01-01
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10.1103/PhysRevLett.121.081307
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© 2018 American Physical Society. We present the results of a search for dark matter weakly interacting massive particles (WIMPs) in the mass range below 20 GeV=c2 using a target of low-radioactivity argon with a 6786.0 kg d exposure. The data were obtained using the DarkSide-50 apparatus at Laboratori Nazionali del Gran Sasso. 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 event=keVee=kg=d and is almost entirely accounted for by known background sources. We obtain a 90% C.L. exclusion limit above 1.8 GeV=c2 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=c2.
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Physical Review Letters
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