Constraints on lepton number violation with the 2 tonne · year CUORE Dataset

matter-antimatter asymmetry underlines the incompleteness of the current understanding of particle physics. Neutrinoless double-beta decay (0νββ) may help explain this asymmetry while unveiling the majorana nature of the neutrino. The CUOre (cryogenic Underground Observatory for rare events) experiment searches for 0νββ of 130Te using a tonne-scale cryogenic calorimeter operated at milli-kelvin temperatures. We report no evidence of 0νββ and place a lower limit on the half-life of T1/2 > 3.5 × 1025 years (90% credibility interval) with over 2 tonne·years of TeO2 exposure. The tools and techniques developed for this result and the 5-year stable operation of nearly 1000 detectors demonstrate crucial infrastructure for future-generation experiments capable of searching for 0νββ across multiple isotopes.