Lawrence Berkeley National Laboratory

The LEGEND Collaboration is searching for neutrinoless double-beta ( ) decay by operating high-purity germanium detectors enriched in in a low-background liquid argon environment. Building on key technological innovations from the GERmanium Detector Array (GERDA) experiment and the MAJORANA DEMONSTRATOR experiment, LEGEND-200 has performed a first decay search based on 61.0 kg yr of data. Over half of this exposure comes from our highest performing detectors, including newly developed inverted-coaxial detectors, and is characterized by an estimated background level of in the decay signal region. A combined analysis of data from GERDA, the MAJORANA DEMONSTRATOR, and LEGEND-200, characterized by a 90% confidence level exclusion sensitivity of on the half-life of decay, reveals no evidence for a signal and sets a new observed lower limit at (90% confidence level). Assuming the decay is mediated by Majorana neutrinos, this corresponds to an upper limit on the effective Majorana mass in the range , depending on the adopted nuclear matrix element.