Recent results from DEAP-3600

Abstract

DEAP-3600 is the largest running dark matter detector filled with liquid argon, set at SNOLAB, in Sudbury, Canada, 2 km underground. The experiment holds the most stringent exclusion limit in argon for WIMPs above 20 GeV/c${}^2$. In the most recent published analysis, the background events due to alpha-induced scintillation in the neck of the detector limited the sensitivity. The sensitivity of the detector in the next WIMP search will be improved thanks to the decrease in backgrounds achieved by hardware upgrades and applying multivariate analyses. Moreover, the WIMP analysis has been revisited in terms of a non-relativistic effective field theory framework, and the impact of possible substructures in the galactic dark matter halo was explored. This analysis was motivated by the latest results from Gaia and the Sloan Sky Digital Survey. Here DEAP-3600 set the world's best exclusion limit for xenon-phobic dark matter scenarios. Finally, a custom-developed analysis has recently pointed out the extraordinary sensitivity to ultra-heavy, multi-scattering dark matter candidates, resulting in world-leading exclusion limits on two composite dark matter candidates up to Planck scale masses. These proceedings, after a quick overview of the dark matter detection in DEAP-3600, outline the detector upgrades and the dark matter search results from the collaboration of the last three years.

References in corpus (10)

• The Sloan Digital Sky Survey: Technical Summary
• Gaia Data Release 2. Summary of the contents and survey properties
• Search for dark matter with a 231-day exposure of liquid argon using DEAP-3600 at SNOLAB
• Design and Construction of the DEAP-3600 Dark Matter Detector
• First direct detection constraints on Planck-scale mass dark matter with multiple-scatter signatures using the DEAP-3600 detector
• Constraints on dark matter-nucleon effective couplings in the presence of kinematically distinct halo substructures using the DEAP-3600 detector
• Electromagnetic Backgrounds and Potassium-42 Activity in the DEAP-3600 Dark Matter Detector
• Pulseshape discrimination against low-energy Ar-39 beta decays in liquid argon with 4.5 tonne-years of DEAP-3600 data
• The liquid-argon scintillation pulseshape in DEAP-3600
• Development and characterization of a slow wavelength shifting coating for background rejection in liquid argon detectors

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