Dark Matter Search Results from the PICO-60 C$_3$F$_8$ Bubble Chamber

A. E. Robinson; A. J. Noble; A. Leblanc; A. Ortega; A. Plante; A. Roeder; A. Sonnenschein; C. Amole; C. B. Krauss; C. E. Dahl

Dark Matter Search Results from the PICO-60 C₃F₈ Bubble Chamber

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arxiv 1702.07666 v3 pith:XYNTE6B6 submitted 2017-02-24 astro-ph.CO hep-exphysics.ins-det

Dark Matter Search Results from the PICO-60 C₃F₈ Bubble Chamber

C. Amole , M. Ardid , I. J. Arnquist , D. M. Asner , D. Baxter , E. Behnke , P. Bhattacharjee , H. Borsodi

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M. Bou-Cabo P. Campion G. Cao C. J. Chen U. Chowdhury K. Clark J. I. Collar P. S. Cooper M. Crisler G. Crowder C. E. Dahl M. Das S. Fallows J. Farine I. Felis R. Filgas F. Girard G. Giroux J. Hall O. Harris E. W. Hoppe M. Jin C. B. Krauss M. Laurin I. Lawson A. Leblanc I. Levine W. H. Lippincott F. Mamedov D. Maurya P. Mitra T. Nania R. Neilson A. J. Noble S. Olson A. Ortega A. Plante R. Podviyanuk S. Priya A. E. Robinson A. Roeder R. Rucinski O. Scallon S. Seth A. Sonnenschein N. Starinski I. \v{S}tekl F. Tardif E. V\'azquez-J\'auregui J. Wells U. Wichoski Y. Yan V. Zacek J. Zhang

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New results are reported from the operation of the PICO-60 dark matter detector, a bubble chamber filled with 52 kg of C$_3$F$_8$ located in the SNOLAB underground laboratory. As in previous PICO bubble chambers, PICO-60 C$_3$F$_8$ exhibits excellent electron recoil and alpha decay rejection, and the observed multiple-scattering neutron rate indicates a single-scatter neutron background of less than 1 event per month. A blind analysis of an efficiency-corrected 1167-kg-day exposure at a 3.3-keV thermodynamic threshold reveals no single-scattering nuclear recoil candidates, consistent with the predicted background. These results set the most stringent direct-detection constraint to date on the WIMP-proton spin-dependent cross section at 3.4 $\times$ 10$^{-41}$ cm$^2$ for a 30-GeV$\thinspace$c$^{-2}$ WIMP, more than one order of magnitude improvement from previous PICO results.

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