We present the results of a search for dark matter weakly interacting massive particles (WIMPs) in the mass range below 20 GeV=c2using 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=c2for 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.

Low-mass dark matter search with 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. - 121:8(2018), p. 081307. [10.1103/PhysRevLett.121.081307]

Low-mass dark matter search with the DarkSide-50 experiment

Carpinelli, M.;D'Urso, D.;Demontis, P.;Pazzona, F.;Suffritti, G. B.;
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=c2using 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=c2for 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
Low-mass dark matter search with 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. - 121:8(2018), p. 081307. [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/11388/215507
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