Search for dark matter with a 231-day exposure of liquid argon using DEAP-3600 at SNOLAB

Ajaj R.,Amaudruz P. -A.,Araujo G. R.,Baldwin M.,Batygov M.,Beltran B.,Bina C. E.,Bonatt J.,Boulay M. G.,Broerman B.,Bueno J. F.,Burghardt P. M.,Butcher A.,Cai B.,Cavuoti S.,Chen M.,Chen Y.,Cleveland B. T.,Cranshaw D.,Dering K.,DiGioseffo J.,Doria L.,Duncan F. A.,Dunford M.,Erlandson A.,Fatemighomi N.,Fiorillo G.,Florian S.,Flower A.,Ford R. J.,Gagnon R.,Gallacher D.,Garcés E. A.,Garg S.,Giampa P.,Goeldi D.,Golovko V. V.,Gorel P.,Graham K.,Grant D. R.,Hallin A. L.,Hamstra M.,Harvey P. J.,Hearns C.,Joy A.,Jillings C. J.,Kamaev O.,Kaur G.,Kemp A.,Kochanek I.,Kuźniak M.,Langrock S.,La Zia F.,Lehnert B.,Li X.,Lidgard J.,Lindner T.,Litvinov O.,Lock J.,Longo G.,Majewski P.,McDonald A. B.,McElroy T.,McGinn T.,McLaughlin J. B.,Mehdiyev R.,Mielnichuk C.,Monroe J.,Nadeau P.,Nantais C.,Ng C.,Noble A. J.,O'Dwyer E.,Ouellet C.,Pasuthip P.,Peeters S. J. M.,Piro M. -C.,Pollmann T. R.,Rand E. T.,Rethmeier C.,Retière F.,Seeburn N.,Singhrao K.,Skensved P.,Smith B.,Smith N. J. T.,Sonley T.,Soukup J.,Stainforth R.,Stone C.,Strickland V.,Sur B.,Tang J.,Vázquez-Jáuregui E.,Veloce L.,Viel S.,Walding J.,Waqar M.,Ward M.,Westerdale S.,Willis J.,Zuñiga-Reyes A.

PHYSICAL REVIEW D（2019）

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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 . 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 x 10(-45) cm(2) (1.5 x 10(-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 the charge and photon detection time distributions observed in each photomultiplier tube.

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Key words

dark matter,liquid argon

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