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16 April 2024

» arxiv » 1902.4031

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Dark Matter Search Results from the Complete Exposure of the PICO-60 C$_3$F$_8$ Bubble Chamber
C. Amole ; M. Ardid ; I. J. Arnquist ; D. M. Asner ; D. Baxter ; E. Behnke ; M. Bressler ; B. Broerman ; G. Cao ; C. J. Chen ; U. Chowdhury ; K. Clark ; J. I. Collar ; P. S. Cooper ; C. B. Coutu ; C. Cowles ; M. Crisler ; G. Crowder ; N. A. Cruz-Venegas ; C. E. Dahl ; M. Das ; S. Fallows ; J. Farine ; I. Felis ; R. Filgas ; F. Girard ; G. Giroux ; J. Hall ; C. Hardy ; O. Harris ; T. Hillier ; E. W. Hoppe ; C. M. Jackson ; M. Jin ; L. Klopfenstein ; C. B. Krauss ; M. Laurin ; I. Lawson ; A. Leblanc ; I. Levine ; C. Licciardi ; W. H. Lippincott ; B. Loer ; F. Mamedov ; P. Mitra ; C. Moore ; T. Nania ; R. Neilson ; A. J. Noble ; P. Oedekerk ; A. Ortega ; M.-C. Piro ; A. Plante ; R. Podviyanuk ; S. Priya ; A. E. Robinson ; S. Sahoo ; O. Scallon ; S. Seth ; A. Sonnenschein ; N. Starinski ; I. Štekl ; T. Sullivan ; F. Tardif ; E. Vázquez-Jáuregui ; N. Walkowski ; E. Weima ; U. Wichoski ; K. Wierman ; Y. Yan ; V. Zacek ; J. Zhang ;
Date:	11 Feb 2019
Abstract:	Final results are reported from operation of the PICO-60 C$_3$F$_8$ dark matter detector, a bubble chamber filled with 52 kg of C$_3$F$_8$ located in the SNOLAB underground laboratory. The chamber was operated at thermodynamic thresholds as low as 1.2 keV without loss of stability. A new blind 1404-kg-day exposure at 2.45 keV threshold was acquired with approximately the same expected total background rate as the previous 1167-kg-day exposure at 3.3 keV. This increased exposure is enabled in part by a new optical tracking analysis to better identify events near detector walls, permitting a larger fiducial volume. These results set the most stringent direct-detection constraint to date on the WIMP-proton spin-dependent cross section at 2.5 $ imes$ 10$^{-41}$ cm$^2$ for a 25 GeV WIMP, and improve on previous PICO results for 3-5 GeV WIMPs by an order of magnitude.
Source:	arXiv, 1902.4031
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