Projected Sensitivity of the LUX-ZEPLIN experiment to the 0nbb decay of 136Xe

The LUX-ZEPLIN (LZ) experiment will enable a neutrinoless double beta decay search in parallel to the main science goal of discovering dark matter particle interactions. We report the expected LZ sensitivity to ¹³⁶Xe neutrinoless double beta decay, taking advantage of the significant (>600 kg) ¹³⁶Xe mass contained within the active volume of LZ without isotopic enrichment. After 1000 live-days, the median exclusion sensitivity to the half-life of ¹³⁶Xe is projected to be 1.06 X 10²⁶ years (90% confidence level), similar to existing constraints. We also report the expected sensitivity of a possible subsequent dedicated exposure using 90% enrichment with ¹³⁶Xe at 1.06 X 10²⁷ years.