WIMP Dark Matter Search using a 3.1 Tonne-Year Exposure of the XENONnT Experiment

Abstract

We report on a search for weakly interacting massive particle (WIMP) dark matter (DM) via elastic DM-xenon-nucleus interactions in the XENONnT experiment. We combine datasets from the first and second science campaigns resulting in a total exposure of 3.1 tonne-years. In a blind analysis of nuclear recoil events with energies above $3.8\mathrm{ke}{\mathrm{V}}_{\mathrm{NR}}$, we find no significant excess above background. We set new upper limits on the spin-independent WIMP-nucleon scattering cross section for WIMP masses above $10\mathrm{GeV}/c^2$ with a minimum of $1.7\times 10^{-47}\mathrm{c}{\mathrm{m}}^2$ at $90\%$ confidence level for a WIMP mass of $30\mathrm{GeV}/c^2$. We achieve a best median sensitivity of $1.4\times 10^{-47}\mathrm{c}{\mathrm{m}}^2$ for a $41\mathrm{GeV}/c^2$ WIMP. Compared to the result from the first XENONnT science dataset, we improve our sensitivity by a factor of up to 1.8.

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