UC Berkeley

CUPID is a next-generation bolometric experiment to search for neutrinoless double-beta decay (0νββ$$0 u \beta \beta $$) of 100Mo using Li2$$_2$$MoO4$$_4$$ scintillating crystals. It will operate 1596 crystals at ∼$$\sim $$10 mK in the CUORE cryostat at the Laboratori Nazionali del Gran Sasso in Italy. Each crystal will be facing two Ge-based bolometric light detectors for α$$\alpha $$ rejection. We compute the discovery and the exclusion sensitivity of CUPID to 0νββ$$0 u \beta \beta $$ in a Frequentist and a Bayesian framework. This computation is done numerically based on pseudo-experiments. For the CUPID baseline scenario, with a background and an energy resolution of 1.0×10-4$$1.0 \times 10^{-4}$$ counts/keV/kg/yr and 5 keV FWHM at the Q-value, respectively, this results in a Bayesian exclusion sensitivity (90% c.i.) of T^1/2>1.6×1027yr$$\hat{T}_{1/2} > 1.6 \times 10^{27} \ \textrm{yr}$$, corresponding to the effective Majorana neutrino mass of m^ββ<9.6$$\hat{m}_{\beta \beta } < \ 9.6$$–28meV$$28 \ \textrm{meV}$$. The Frequentist discovery sensitivity (3σ$$\sigma $$) is T^1/2=1.0×1027yr$$\hat{T}_{1/2}= 1.0 \times 10^{27} \ \textrm{yr}$$, corresponding to m^ββ=12$$\hat{m}_{\beta \beta }= \ 12$$ – 36meV$$36 \ \textrm{meV}$$.