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 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
LUX-ZEPLIN’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 ratio analysis shows the data to be consistent with a
background-only hypothesis, setting new limits on spin-independent
WIMP-nucleon, spin-dependent WIMP-neutron, and spin-dependent WIMP-proton cross
sections for WIMP masses above 9 GeV/c$^2$. The most stringent limit is set for
spin-independent scattering at 36 GeV/c$^2$, rejecting cross sections above
9.2$times 10^{-48}$ cm$^2$ at the 90% confidence level.
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