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.

Agnes, P., Albuquerque, I. . ., Alexander, T., Alton, A. ., Araujo, G. ., Asner, D. ., et al. (2018). Low-Mass Dark Matter Search with the DarkSide-50 Experiment. PHYSICAL REVIEW LETTERS, 121(8) [10.1103/PhysRevLett.121.081307].

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

Budano, F.
Membro del Collaboration Group
;
Bussino, S.
Membro del Collaboration Group
;
De Vincenzi, M.
Membro del Collaboration Group
;
James, I.
Membro del Collaboration Group
;
Mari, S. M.
Membro del Collaboration Group
;
Sanfilippo, S.
Membro del Collaboration Group
;
Tonazzo, A.
Membro del Collaboration Group
;
Verducci, M.
Membro del Collaboration Group
;
2018-01-01

Abstract

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.
2018
Agnes, P., Albuquerque, I. . ., Alexander, T., Alton, A. ., Araujo, G. ., Asner, D. ., et al. (2018). Low-Mass Dark Matter Search with the DarkSide-50 Experiment. PHYSICAL REVIEW LETTERS, 121(8) [10.1103/PhysRevLett.121.081307].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/339095
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