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First results from the DEAP-3600 dark matter search with argon at SNOLAB

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arxiv 1707.08042 v4 pith:U7J4IC4A submitted 2017-07-25 astro-ph.CO astro-ph.IMhep-exhep-ph

First results from the DEAP-3600 dark matter search with argon at SNOLAB

DEAP-3600 Collaboration: P.-A. Amaudruz , M. Baldwin , M. Batygov , B. Beltran , C. E. Bina , D. Bishop , J. Bonatt , G. Boorman
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M. G. Boulay B. Broerman T. Bromwich J. F. Bueno P. M. Burghardt A. Butcher B. Cai S. Chan M. Chen R. Chouinard B. T. Cleveland D. Cranshaw K. Dering J. DiGioseffo S. Dittmeier F. A. Duncan M. Dunford A. Erlandson N. Fatemighomi S. Florian A. Flower R. J. Ford R. Gagnon P. Giampa V. V. Golovko P. Gorel R. Gornea E. Grace K. Graham E. Gulyev R. Hakobyan A. Hall A. L. Hallin M. Hamstra P. J. Harvey C. Hearns C. J. Jillings O. Kamaev A. Kemp M. Ku\'zniak S. Langrock F. La Zia B. Lehnert J. J. Lidgard C. Lim T. Lindner Y. Linn S. Liu P. Majewski R. Mathew A. B. McDonald T. McElroy T. McGinn J. B. McLaughlin S. Mead R. Mehdiyev C. Mielnichuk J. Monroe A. Muir P. Nadeau C. Nantais C. Ng A. J. Noble E. O'Dwyer C. Ohlmann K. Olchanski K. S. Olsen C. Ouellet P. Pasuthip S. J. M. Peeters T. R. Pollmann E. T. Rand W. Rau C. Rethmeier F. Reti\`ere N. Seeburn B. Shaw K. Singhrao P. Skensved B. Smith N. J. T. Smith T. Sonley J. Soukup R. Stainforth C. Stone V. Strickland B. Sur J. Tang J. Taylor L. Veloce E. V\'azquez-J\'auregui J. Walding M. Ward S. Westerdale E. Woolsey J. Zielinski
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classification astro-ph.CO astro-ph.IMhep-exhep-ph
keywords argondarkdetectormatterresultsdeap-3600firstmass
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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This paper reports the first results of a direct dark matter search with the DEAP-3600 single-phase liquid argon (LAr) detector. The experiment was performed 2 km underground at SNOLAB (Sudbury, Canada) utilizing a large target mass, with the LAr target contained in a spherical acrylic vessel of 3600 kg capacity. The LAr is viewed by an array of PMTs, which would register scintillation light produced by rare nuclear recoil signals induced by dark matter particle scattering. An analysis of 4.44 live days (fiducial exposure of 9.87 tonne-days) of data taken with the nearly full detector during the initial filling phase demonstrates the detector performance and the best electronic recoil rejection using pulse-shape discrimination in argon, with leakage $<1.2\times 10^{-7}$ (90% C.L.) between 16 and 33 keV$_{ee}$. No candidate signal events are observed, which results in the leading limit on WIMP-nucleon spin-independent cross section on argon, $<1.2\times 10^{-44}$ cm$^2$ for a 100 GeV/c$^2$ WIMP mass (90% C.L.).

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