Search for dark matter with a 231-day exposure of liquid argon using DEAP-3600 at SNOLAB
R. Ajaj, P.-A. Amaudruz, G. R. Araujo, M. Baldwin, M. Batygov, B., Beltran, C. E. Bina, J. Bonatt, M. G. Boulay, B. Broerman, J. F. Bueno, P. M., Burghardt, A. Butcher, B. Cai, S. Cavuoti, M. Chen, Y. Chen, B. T. Cleveland,, D. Cranshaw, K. Dering, J. DiGioseffo, L. Doria
TL;DR
This paper reports on a dark matter search using the DEAP-3600 liquid argon detector at SNOLAB, setting new limits on WIMP-nucleon interactions based on 231 days of data with advanced background suppression and analysis techniques.
Contribution
The study introduces improved pulse-shape discrimination, Bayesian photoelectron counting, and dual position reconstruction algorithms in a large liquid argon detector for dark matter detection.
Findings
No candidate events observed in the WIMP search region.
Sets the leading limit on WIMP-nucleon cross section for 100 GeV/c² WIMPs.
Demonstrates the best pulse-shape discrimination in liquid argon at threshold.
Abstract
DEAP-3600 is a single-phase liquid argon (LAr) direct-detection dark matter experiment, operating 2 km underground at SNOLAB (Sudbury, Canada). The detector consists of 3279 kg of LAr contained in a spherical acrylic vessel. This paper reports on the analysis of a 758 tonne\cdot day exposure taken over a period of 231 live-days during the first year of operation. No candidate signal events are observed in the WIMP-search region of interest, which results in the leading limit on the WIMP-nucleon spin-independent cross section on a LAr target of cm ( cm) for a 100 GeV/c (1 TeV/c) WIMP mass at 90\% C. L. In addition to a detailed background model, this analysis demonstrates the best pulse-shape discrimination in LAr at threshold, employs a Bayesian photoelectron-counting technique to improve the energy resolution and…
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