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One of the few remaining unknowns in the standard three-flavor neutrinooscillation paradigm is the ordering of neutrino masses. In this work wepropose a novel method for determining neutrino mass ordering using the timeinformation on early supernova neutrino events. In a core-collapse supernova,neutrinos are produced earlier than antineutrinos and, depending on the massordering which affects the adiabatic flavor evolution, may cause earlierobservable signals in $\nu_e$ detection channels than in others. Hence, thetime differences are sensitive to the mass ordering. We find that using thetime information on the detection of the first galactic supernova events atfuture detectors like DUNE, JUNO and Hyper-Kamiokande, the mass ordering canalready be determined at $\sim 2 \sigma$ CL, while $\mathcal{O}(10)$ eventssuffice for the discovery. Our method does not require high statistics andcould be used within the supernova early warning system (SNEWS) which will haveaccess to the time information on early supernova neutrino events recorded in anumber of detectors. The method proposed in this paper also implies a crucialinterplay between the mass ordering and the triangulation method for locatingsupernovae.

Timing and Multi-Channel: Novel Method for Determining the Neutrino Mass Ordering from Supernovae