  We investigate the ability of the upcoming Hyper-Kamiokande (Hyper-K)
neutrino experiment to detect new physics phenomena beyond the standard,
three-massive-neutrinos paradigm; namely the existence of a fourth, sterile
neutrino or weaker-than-weak, non-standard neutrino interactions. With both
beam-based neutrinos from the Japan Proton Accelerator Research Complex
(J-PARC) and atmospheric neutrinos, Hyper-K is capable of exploring new ranges
of parameter space in these new-physics scenarios. We find that Hyper-K has
comparable capability to the upcoming Deep Underground Neutrino Experiment
(DUNE), and that combining both beam- and atmospheric-based data can clear up
degeneracies in the parameter spaces of interest. We also comment on the
potential improvement in searches for new physics if a combined analysis were
performed using Hyper-K and DUNE data.
