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Abstract

In June 2022, the LUX-ZEPLIN collaboration released its first results, with the
most precise measurements of any direct dark matter detector. The findings were
calculated using the expected spin-independent WIMP-nucleon interaction model,
which would result in small energies deposited in the detector. Therefore, the
background of non-dark interactions was calculated for events with S1 areas up to
80 phd (Aalbers et al. 2022). In order to increase the sensitivity to high energy
WIMP-nucleon interaction events, as predicted by other models, we extended the
non-dark NR background to events with S1 areas of up to 600 phd. We found a
large contribution to the NR background from ER leakage. Though the leakage
peaked below 80 phd, the leakage rate at 80 phd is roughly 1% for all interaction
models, and falls to zero between 150 phd and 200 phd. The expected number
of xenon-based MSSI is roughly 0.015 for all spin-dependent interaction models,
peaking at high S1 areas. We found the rate of cathode-based MSSI to be zero.
The wall based MSSI rate we calculated is significantly higher than is shown by
the data, which likely means that the model of the electric field in the detector is
incorrect.

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