DarkSide-50 532-day Dark Matter Search with Low-Radioactivity Argon
The DarkSide Collaboration: P. Agnes, I. F. M. Albuquerque, T., Alexander, A. K. Alton, G. R. Araujo, 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, A. Caminata
TL;DR
The DarkSide-50 experiment conducted a 16,660 kg-day search for dark matter using low-radioactivity argon, finding no signals and setting new upper limits on dark matter interactions.
Contribution
This paper reports the first blind analysis of a large underground argon detector with no observed dark matter events, establishing new constraints on WIMP-nucleon cross sections.
Findings
No dark matter events detected in the analysis.
Set upper limits on spin-independent WIMP-nucleon cross section.
Demonstrated effectiveness of underground argon for dark matter searches.
Abstract
The DarkSide-50 direct-detection dark matter experiment is a dual-phase argon time projection chamber operating at Laboratori Nazionali del Gran Sasso. This paper reports on the blind analysis of a (16,660+-270) kg d exposure using a target of low-radioactivity argon extracted from underground sources. We find no events in the dark matter selection box and set a 90% C.L. upper limit on the dark matter-nucleon spin-independent cross section of 1.14E-44 cm^2 (3.78E-44 cm^2, 3.43E-43 cm^2) for a WIMP mass of 100 GeV/c^2 (1 TeV/c^2, 10 TeV/c^2).
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