Improved dark matter search results from PICO-2L Run 2

Abstract

New data are reported from a second run of the 2-liter PICO-2L C${}_3$F${}_8$ bubble chamber with a total exposure of 129kg-days at a thermodynamic threshold energy of 3.3keV. These data show that measures taken to control particulate contamination in the superheated fluid resulted in the absence of the anomalous background events observed in the first run of this bubble chamber. One single nuclear-recoil event was observed in the data, consistent both with the predicted background rate from neutrons and with the observed rate of unambiguous multiple-bubble neutron scattering events. The chamber exhibits the same excellent electron-recoil and alpha decay rejection as was previously reported. These data provide the most stringent direct detection constraints on weakly interacting massive particle (WIMP)-proton spin-dependent scattering to date for WIMP masses $<$ 50GeV/c${}^2$.

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