Search for inelastic scattering of WIMP dark matter in XENON1T

Abstract

We report the results of a search for the inelastic scattering of weakly interacting massive particles (WIMPs) in the XENON1T dark matter experiment. Scattering off ${}^{129}$Xe is the most sensitive probe of inelastic WIMP interactions, with a signature of a 39.6 keV de-excitation photon detected simultaneously with the nuclear recoil. Using an exposure of 0.89 tonne-years, we find no evidence of inelastic WIMP scattering with a significance of more than 2$\sigma$. A profile-likelihood ratio analysis is used to set upper limits on the cross-section of WIMP-nucleus interactions. We exclude new parameter space for WIMPs heavier than 100 GeV/c${}^2$, with the strongest upper limit of $3.3\times 10^{-39}$ cm${}^2$ for 130 GeV/c${}^2$ WIMPs at 90\% confidence level.

9 pages, 4 figures

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• Deep-underground dark matter search with a COSINUS detector prototype
• Self-consistent calculations for atomic electron capture
• Probing the dark sector with nuclear transition photons
• Search for inelastic dark matter in events with two displaced muons and missing transverse momentum in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• New constraints on cosmic ray-boosted dark matter from the LUX-ZEPLIN experiment
• Probing dark matter with polarimetry techniques
• Search for inelastic WIMP-iodine scattering with COSINE-100
• Observation of Radon Mitigation in MicroBooNE by a Liquid Argon Filtration System
• Coherence in scattering of massive weakly interacting neutral particles off nuclei
• Dark Matter Internal Pair Production -- A Novel Direct Detection Mechanism