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Title: Background determination for the LUX-ZEPLIN dark matter experiment
Authors: Brás, P. 
Cabrita, R. 
Lindote, A. 
Lopes, M. I. 
Lopez-Asamar, E. 
Neves, F. 
Pereira, G. 
Porzio, D. 
Silva, C. 
Solovov, V. N. 
The LUX-ZEPLIN Collaboration
Issue Date: Jul-2023
Publisher: American Physical Society
Serial title, monograph or event: Physical Review D
Volume: 108
Issue: 1
Abstract: 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 ð6.3 0.5Þ × 10−5 events=keVee=kg=day in the low-energy region, approximately 60 times lower than the equivalent rate reported by the LUX experiment.
DOI: 10.1103/PhysRevD.108.012010
Rights: openAccess
Appears in Collections:LIP - Artigos em Revistas Internacionais

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