Development of light detectors with Neganov-Trofimov-Luke (NTL) amplification for the CUPID experiment

CUPID (CUORE Upgrade with Particle IDentification) is a next-generation experiment that will primarily search for neutrinoless double-beta (0νββ) decay of ¹⁰⁰Mo. The main innovation of CUPID with respect to its predecessor, CUORE, is its dual calorimeter readout detector design. By coupling active Li₂MoO₄ scintillating crystal calorimeters with particle-dependent light response and auxiliary Ge wafer calorimeters acting as light detectors, CUPID will be able to suppress alpha particles, the dominant background in CUORE. Data-driven Monte Carlo simulations show that the leading contribution to the background in CUPID will be from ¹⁰⁰Mo 2νββ decay. To meet the m_ββ sensitivity goal of a 5x improvement over its predecessor, this background must also be minimized; enhanced light detectors, capable of resolving pileup of 2νββ decay events, may be the key. This presentation will describe the R&D efforts toward light detectors with Neganov-Trofimov-Luke (NTL) amplification for CUPID.