Speaker
Description
The LZ experiment, the largest liquid xenon time-projection chamber (TPC) built to date, continues to provide world leading sensitivity to WIMP dark matter candidates. In this talk, I will present the most recent results searching for WIMP dark matter from the combined 2022-2024 exposure. In addition to the increased exposure, the latest result showcases a number of refinements to LZ’s background modelling, such as a radon tagging analysis, that reduces the dominant background by 60%, and detailed modelling and in-situ measurement of charge attenuation of the rare decay of 124Xe via double electron capture. Alongside the target mass and strict control of radiogenic backgrounds, the sensitivity of LZ and other dark matter detectors depends critically on achieving a low detector threshold. This talk will also cover how LZ has achieved a keV-level detection threshold, with a particular focus on the VUV photomultipliers and their readout.
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