Search for Invisible Nucleon Decay in the SNO+ Light Water Phase

Many Grand Unified Theories predict processes that would allow baryons to decay to leptons, violating baryon number conservation.  The observation of baryon number violation in nucleon decay would be a revelation as well as being pivotal in understanding the apparent asymmetry between baryons and anti-baryons in the universe.  This is manifest in some theories primarily through the decay of nucleons to three chargeless leptons (e.g. n -> 3ν), which can only be observed through the resulting nuclear deexcitation gamma. This "invisible" nucleon decay could be observable in water through the deexcitation of the resulting oxygen-15 nucleus which emits a 6.2 MeV gamma and requires that backgrounds at these energies, in a large detector, to be extremely low. Presented here are the first results from the SNO+ light water phase which consists of nearly 120 days of live data taking. A blind analysis was performed using a Poisson counting method and a maximum likelihood method independently to obtain the results.