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
Carpinelli, M.Membro del Collaboration Group
;
2018
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.File | Dimensione | Formato | |
---|---|---|---|
1802.06994.pdf
accesso aperto
Descrizione: Article
Tipologia di allegato:
Publisher’s Version (Version of Record, VoR)
Dimensione
1.87 MB
Formato
Adobe PDF
|
1.87 MB | Adobe PDF | Visualizza/Apri |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.