DEAP-3600 Detector Improves Dark Matter Search Limits

This study presents the results of a dark matter search using the DEAP-3600 detector at SNOLAB. The experiment utilizes 790.8 live-days of data collected with 3269 kg of liquid argon to search for WIMP dark matter. The analysis employs the Profile Likelihood Ratio method, which benefits from an increased fiducial volume and improved event selection acceptance. The dominant source of background events is alpha-decays from dust particulates circulating within the liquid argon target, which limits the sensitivity of the search.

The results provide improved exclusion upper limits on the WIMP-nucleon spin-independent cross section on liquid argon for WIMP masses between 20 GeV/c^2 and 100 GeV/c^2. At 100 GeV/c^2, the observed limit is 3.4 x 10^-45 cm^2 at 90% confidence level. While this result does not represent a direct detection of dark matter, it provides valuable constraints on the properties of WIMPs and guides future dark matter searches. Further improvements in detector technology and background reduction techniques are necessary to increase the sensitivity of these experiments and potentially achieve a direct detection.

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