Search for dark matter with a 231-day exposure of liquid argon using DEAP-3600 at SNOLAB
Creators: name: Ajaj, R.
name: Amaudruz, P. -A.
name: Araujo, G. R.
name: Baldwin, M.
name: Batygov, M.
name: Beltran, B.
name: Bina, C. E.
name: Bonatt, J.
name: Boulay, M. G.
name: Broerman, B.
name: Bueno, J. F.
name: Burghardt, P. M.
name: Butcher, A.
name: Cai, B.
name: Cavuoti, S.
name: Chen, M.
name: Chen, Y.
name: Cleveland, B. T.
name: Cranshaw, D.
name: Dering, K.
name: DiGioseffo, J.
name: Doria, L.
name: Duncan, F. A.
name: Dunford, M.
name: Erlandson, A.
name: Fatemighomi, N.
name: Fiorillo, G.
name: Florian, S.
name: Flower, A.
name: Ford, R. J.
name: Gagnon, R.
name: Gallacher, D.
name: Garcés, E. A.
name: Garg, S.
name: Giampa, P.
name: Goeldi, D.
name: Golovko, V. V.
name: Gorel, P.
name: Graham, K.
name: Grant, D. R.
name: Hallin, A. L.
name: Hamstra, M.
name: Harvey, P. J.
name: Hearns, C.
name: Joy, A.
name: Jillings, C. J.
name: Kamaev, O.
name: Kaur, G.
name: Kemp, A.
name: Kochanek, I.
name: Kuźniak, M.
name: Langrock, S.
name: La Zia, F.
name: Lehnert, B.
name: Li, X.
name: Lidgard, J.
name: Lindner, T.
name: Litvinov, O.
name: Lock, J.
name: Longo, G.
name: Majewski, P.
name: McDonald, A. B.
name: McElroy, T.
name: McGinn, T.
name: McLaughlin, J. B.
name: Mehdiyev, R.
name: Mielnichuk, C.
name: Monroe, J.
name: Nadeau, P.
name: Nantais, C.
name: Ng, C.
name: Noble, A. J.
name: O'Dwyer, E.
name: Ouellet, C.
name: Pasuthip, P.
name: Peeters, S. J. M.
name: Piro, M. -C.
name: Pollmann, T. R.
name: Rand, E. T.
name: Rethmeier, C.
name: Retière, F.
name: Seeburn, N.
name: Singhrao, K.
name: Skensved, P.
name: Smith, B.
name: Smith, N. J. T.
name: Sonley, T.
name: Soukup, J.
name: Stainforth, R.
name: Stone, C.
name: Strickland, V.
name: Sur, B.
name: Tang, J.
name: Vázquez-Jáuregui, E.
name: Veloce, L.
name: Viel, S.
name: Walding, J.
name: Waqar, M.
name: Ward, M.
name: Westerdale, S.
name: Willis, J.
name: Zuñiga-Reyes, A.
Publisher: name: arXiv
Year: 2019
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 $3.9\times10^{-45}$ cm$^{2}$ ($1.5\times10^{-44}$ cm$^{2}$) for a 100 GeV/c$^{2}$ (1 TeV/c$^{2}$) 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 discrimination efficiency, and utilizes two position reconstruction algorithms based on PMT charge and photon arrival times.