Background determination for the LUX-ZEPLIN dark matter experiment

The LUX-ZEPLIN Collaboration

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11 Scopus citations


The LUX-ZEPLIN experiment recently reported limits on WIMP-nucleus interactions from its initial science run, down to 9.2×10-48 cm2 for the spin-independent interaction of a 36 GeV/c2 WIMP at 90% confidence level. In this paper, we present a comprehensive analysis of the backgrounds important for this result and for other upcoming physics analyses, including neutrinoless double-beta decay searches and effective field theory interpretations of LUX-ZEPLIN data. We confirm that the in-situ determinations of bulk and fixed radioactive backgrounds are consistent with expectations from the ex-situ assays. The observed background rate after WIMP search criteria were applied was (6.3±0.5)×10-5 events/keVee/kg/day in the low-energy region, approximately 60 times lower than the equivalent rate reported by the LUX experiment.

Original languageEnglish (US)
Article number012010
JournalPhysical Review D
Issue number1
StatePublished - Jul 1 2023

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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