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

Abstract

Matter-antimatter asymmetry underlines the incompleteness of the current understanding of particle physics. Neutrinoless double-beta decay (0vββ) may help explain this asymmetry, while unveiling the Majorana nature of the neutrino. The CUORE experiment searches for 0vββ of ¹³⁰Te using a tonne-scale cryogenic calorimeter operated at milli-kelvin temperatures. We report no evidence of 0vββ and place a lower limit on the half-life of T_1/2 > 3.5 × 10²⁵ years (90% C.I.) with over 2 tonne·year TeO₂ exposure. The tools and techniques developed for this result and the 5 year stable operation of nearly 1000 detectors demonstrate crucial infrastructure for a future-generation experiment capable of searching for 0vββ across multiple isotopes.