Results from a Search for Dark Matter in the Complete LUX Exposure
Результаты поиска тёмной материи в полном экспозиции LUX
2017-01-11
SCID: 54.1/5m9755z7
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3.35×10^4 kg day exposureLUX experimentWIMP-nucleon cross section limits (2.2×10^-46 cm^2 at 50 GeV/c^2; combined 1.1×10^-46 cm^2)dual-phase xenon time projection chamberspin-independent WIMP-nucleon scattering
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Abstract (AI)
We report constraints on spin-independent weakly interacting massive particle (WIMP)-nucleon scattering using a 3.35×10^{4} kg day exposure of the Large Underground Xenon (LUX) experiment. A dual-phase xenon time projection chamber with 250 kg of active mass is operated at the Sanford Underground Research Facility under Lead, South Dakota (USA). With roughly fourfold improvement in sensitivity for high WIMP masses relative to our previous results, this search yields no evidence of WIMP nuclear recoils. At a WIMP mass of 50 GeV c^{-2}, WIMP-nucleon spin-independent cross sections above 2.2×10^{-46} cm^{2} are excluded at the 90% confidence level. When combined with the previously reported LUX exposure, this exclusion strengthens to 1.1×10^{-46} cm^{2} at 50 GeV c^{-2}.
Key Findings
1
At a WIMP mass of 50 GeV/c^2, spin-independent WIMP-nucleon cross sections above 2.2×10^{-46} cm^2 are excluded at 90% confidence.
2
Combining this exposure with previously reported LUX data strengthens the 50 GeV/c^2 exclusion to 1.1×10^{-46} cm^2 at 90% confidence.
3
The LUX search improves sensitivity roughly fourfold at high WIMP masses compared to the experiment's previous results.
4
The measurement was performed with a dual-phase xenon time projection chamber containing 250 kg active mass at the Sanford Underground Research Facility.
5
Using a 3.35×10^4 kg·day LUX exposure, no evidence of WIMP nuclear recoils was observed.
Research Object
Large Underground Xenon (LUX) dual-phase xenon time projection chamber detector with 250 kg active mass operated at the Sanford Underground Research Facility
Research Subject
Constraints on spin-independent WIMP–nucleon scattering cross section (limits on WIMP nuclear recoils) derived from a 3.35×10^{4} kg·day exposure, including exclusion limits at 50 GeV c^{-2}
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2017-01-11
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