Toward CUPID-1T: a bolometric experiment to explore 0νββ in the Normal Ordering region

Current experiments to search for broken lepton-number symmetry through the observation of neutrinoless double-beta decay (0νββ) provide the most stringent limits on the Majorana nature of neutrinos and the effective Majorana neutrino mass (m_ββ). CUORE Upgrade with Particle IDentification (CUPID) is a next-generation search for neutrinoless double-beta decay which will use light from cryogenic calorimeters to tag particles by their heat-to-light signal ratio. CUPID will focus on sensitivity to the 0νββ half-life of O(10²⁷ years) and m_ββ∼15meV, which would provide complete coverage of the Inverted Ordering region of the neutrino mass parameter space.

CUPID is under development at the 250 kg level, but is already looking to the next tonne stage: CUPID-1T. With reasonably achievable advancements in sensor technology and background reduction, CUPID-1T can increase the sensitivity by at least another order of magnitude, exploring the large fraction of the parameter space that corresponds to the neutrino mass Normal Ordering. Scaling the next generation of crystalline detectors to this size requires tens of thousands of channels, as well as advancements in background rejection. I will present a series of projects underway that will provide advancements in background reduction, cryogenic readout, and physics searches beyond 0νββ, all moving toward the next-to-next generation CUPID-1T detector.