Effective field theory interactions for liquid argon target in DarkSide-50 experiment

Abstract

We reanalyze data collected with the DarkSide-50 experiment and recently used to set limits on the spinindependent interaction rate of weakly interacting massive particles (WIMPs) on argon nuclei with an effective field theory framework. The dataset corresponds to a total 16660 ∓ 270Þ kg d exposure using a target of low-radioactivity argon extracted from underground sources. We obtain upper limits on the effective couplings of the 12 leading operators in the nonrelativistic systematic expansion