CUPID Multiplicity-2 Analysis
ORAL
Abstract
CUORE Upgrade with Particle IDentification (CUPID) is a next-generation ton-scale experiment searching for neutrinoless double beta decay using arrays of Li₂MoO₄ crystals. Building upon the CUORE design, CUPID incorporates light detectors for particle identification, enabling effective rejection of alpha backgrounds.
While the signal of interest—two electrons from a neutrinoless double beta decay—is expected to deposit energy within a single crystal, surface events may result in energy sharing between adjacent absorbers. This motivates the study of multiplicity-2 (M2) events, where two channels are triggered. In this presentation, we characterize the features of M2 events in CUPID simulations, outline methods for background rejection, and provide a sensitivity estimate for CUPID in the M2 event topology.
While the signal of interest—two electrons from a neutrinoless double beta decay—is expected to deposit energy within a single crystal, surface events may result in energy sharing between adjacent absorbers. This motivates the study of multiplicity-2 (M2) events, where two channels are triggered. In this presentation, we characterize the features of M2 events in CUPID simulations, outline methods for background rejection, and provide a sensitivity estimate for CUPID in the M2 event topology.
**This work is supported by the US DOE Office of Nuclear Physics, the US NSF, and internal investments at all institutions.
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Presenters
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Tong Zhu
- University of California, Berkeley