First Dark Matter Search Results from the LUX-ZEPLIN (LZ) Experiment

Kavli Affiliate: C. M. Ignarra

| First 5 Authors: J. Aalbers, D. S. Akerib, C. W. Akerlof, A. K. Al Musalhi, F. Alder

| Summary:

The LUX-ZEPLIN (LZ) experiment is a dark matter detector centered on a
dual-phase xenon time projection chamber operating at the Sanford Underground
Research Facility in Lead, South Dakota, USA. This Letter reports results from
LZ’s first search for Weakly Interacting Massive Particles (WIMPs) with an
exposure of 60 live days using a fiducial mass of 5.5 t. A profile-likelihood
analysis shows the data to be consistent with a background-only hypothesis,
setting new limits on spin-independent WIMP-nucleon cross-sections for WIMP
masses above 9 GeV/c$^2$. The most stringent limit is set at 30 GeV/c$^2$,
excluding cross sections above 5.9$times 10^{-48}$ cm$^2$ at the 90%
confidence level.

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