Speaker
Description
LUX-ZEPLIN (LZ) is a dual-phase xenon time projection chamber (TPC) designed to achieve sensitivity to a WIMP-nucleon spin-independent cross section of 1.4 × 10−48 cm^2 at a WIMP mass of 40GeV/c^2 after a livetime of 1000 live days. One of the key strengths of a dual-phase TPC is the use of both an electroluminescence and scintillation signal to discriminate signal from background, as well as to discriminate electron recoils from nuclear recoils. However, there is a non-negligible probability of an isolated electroluminescence and scintillation signal inside the LZ TPC being incorrectly identified as a scattering event. These accidental coincidence backgrounds are heavily dependent on detector geometry, are difficult to predict in advance of operation, and decrease the sensitivity of any dual-phase experiment. This poster details some sources of isolated signals within LZ, along with a number of methods of reducing these signals, which will be applied to the first science run of LZ data.
