Dark Matter Search Results from 4.2 Tonne-Years of Exposure of the LUX-ZEPLIN (LZ) Experiment
Physical Review Letters American Physical Society (APS) 135:1 (2025) 011802
Abstract:
We report results of a search for nuclear recoils induced by weakly interacting massive particle (WIMP) dark matter using the LUX-ZEPLIN (LZ) two-phase xenon time projection chamber. This analysis uses a total exposure of tonne-years from 280 live days of LZ operation, of which tonne-years and 220 live days are new. A technique to actively tag background electronic recoils from decays is featured for the first time. Enhanced electron-ion recombination is observed in two-neutrino double electron capture decays of , representing a noteworthy new background. After removal of artificial signal-like events injected into the dataset to mitigate analyzer bias, we find no evidence for an excess over expected backgrounds. World-leading constraints are placed on spin-independent (SI) and spin-dependent WIMP-nucleon cross sections for masses . The strongest SI exclusion set is at the 90% confidence level and the best SI median sensitivity achieved is , both for a mass of . Published by the American Physical Society 2025First Constraint on Atmospheric Millicharged Particles with the LUX-ZEPLIN Experiment
Physical Review Letters American Physical Society (APS) 134:24 (2025) 241802
New Constraints on Cosmic Ray-Boosted Dark Matter from the LUX-ZEPLIN Experiment
Physical Review Letters American Physical Society (APS) 134:24 (2025) 241801
Dark Matter Search Results from 4.2 Tonne-Years of Exposure of the LUX-ZEPLIN (LZ) Experiment
ArXiv 2410.17036 (2024)
Two-neutrino double electron capture of $^{124}$Xe in the first LUX-ZEPLIN exposure
(2024)