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Searching for dark matter with LZ (and maybe adding hydrogen)
LUX-Zeplin (LZ) is a dark matter experiment under construction at the 4850-foot level of the Sanford Underground Research Facility in Lead, South Dakota. The experiment utilizes a two phase time projection chamber (TPC), containing seven active tonnes of liquefied xenon, to search for weakly interacting massive particles (WIMPs). Auxiliary veto detectors, including a liquid scintillator outer detector, improve rejection of unwanted backgrounds events in the central region of the detector. LZ has been designed to improve on current best sensitivities by a factor of 50 or more, and data taking is expected to begin this year. In this talk, I'll describe the LXe-TPC technology, and discuss the current status of the LZ project and detector commissioning. If there is time, I will also discuss an idea to increase the sensitivity of LZ to low mass dark matter by adding trace amounts of hydrogen to the liquid.