Aalbers, J., Akerib, D.S., Musalhi, A.K.A. et al. (215 more authors) (2025) Dark matter search results from 4.2 tonne-years of exposure of the LUX-ZEPLIN (LZ) experiment. Physical Review Letters, 135 (1). 011802. ISSN 0031-9007
Abstract
Wereport 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 4.2 0.1 tonne-years from 280 live days of LZ operation, of which 3.3 0.1 tonne-years and 220 live days are new. A technique to actively tag background electronic recoils from 214Pb β decays is featured for the first time. Enhanced electron-ion recombination is observed in two-neutrino double electron capture decays of 124Xe, 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 ≥9 GeV=c2. The strongest SI exclusion set is 2.2 × 10−48 cm2 at the 90%confidence level and the best SI median sensitivity achieved is 5.1 × 10−48 cm2, both for a mass of 40 GeV=c2.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2025 American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. |
Keywords: | Dark matter direct detection; Particle dark matter; Weakly interacting massive particles; Dark matter detectors; Time-projection chambers |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) |
Funding Information: | Funder Grant number SCIENCE AND TECHNOLOGY FACILITIES COUNCIL ST/W000547/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 09 Jul 2025 10:35 |
Last Modified: | 09 Jul 2025 10:35 |
Status: | Published |
Publisher: | American Physical Society (APS) |
Refereed: | Yes |
Identification Number: | 10.1103/4dyc-z8zf |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:228972 |