Neutrino Decay in JUNO

The decay of the neutrino mass eigenstates are well-constrained using astrophysical neutrinos, with the exception of neutrino mass eigenstate ν₃, which has a much less stringent lifetime bound. In this work, we explore the sensitivity of the Jiangmen Underground Neutrino Experiment (JUNO) to ν₃-decay. JUNO is a next-generation reactor neutrino liquid-scintillator detector with enhanced flavour sensitivity, exceptional energy resolution and high statistics, which operates on a medium-baseline and could be uniquely tuned to uncover evidence of neutrino decay. We consider the signature of ν₃-decay as damping signatures on the neutrino oscillation spectrum in the case of (1) invisible decay, where the daughter states are not observable; and (2) visible decay, where the daughter states are active neutrinos. We comment on how neutrino decay models can be embedded into larger consistent theories.