The LZ TPC S2 Trigger and Event Selection in LZ

The LZ Experiment uses a 7-ton (5.6 fiducial) dual-phase xenon detector to search for dark matter. LZ uses a custom-developed trigger system for event selection and 1st level data sparsification. The custom-developed system allows us to test the efficiency of the trigger in a number of ways with tools including injected waveforms, and digitization of logic signals indicating the trigger decision within recorded events. Custom firmware allows us to monitor trigger performance while actively acquiring data. The trigger system employs real-time thresholding on filter response at a channel-by-channel waveform level to make the trigger decision. In this talk, trigger efficiency, the probability that an event of interest is selected for offline analysis, is discussed.