Low-Mass Dark Matter Search with the DarkSide-50 Experiment
The DarkSide Collaboration: P. Agnes, I. F. M. Albuquerque, T., Alexander, A. K. Alton, G. R. Araujo, D. M. Asner, M. Ave, H. O. Back, B., Baldin, G. Batignani, K. Biery, V. Bocci, G. Bonfini, W. Bonivento, B., Bottino, F. Budano, S. Bussino, M. Cadeddu, M. Cadoni, F. Calaprice
TL;DR
This paper reports a search for low-mass dark matter particles using the DarkSide-50 detector, setting new exclusion limits for WIMP-nucleon interactions below 6 GeV/c^2.
Contribution
It introduces a low-radioactivity argon detector analysis that extends exclusion limits for dark matter particles in the sub-6 GeV/c^2 mass range.
Findings
No dark matter signal detected above background
Extended exclusion limits for WIMPs below previous bounds
Sensitive ionization detection down to 0.1 keVee
Abstract
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.
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