Speaker
Description
One of the open questions in neutrino physics is that of the mass-ordering. In the three flavor paradigm, it is unknown if the masses of the three massive neutrinos are arranged in the normal (m1>m2>m3) or inverted (m3>m1>m2) ordering. Atmospheric neutrinos, which are electron and muon neutrinos produced in the atmosphere by cosmic rays, provide a window into the neutrino mass-ordering. If the mass-ordering is normal (inverted), we expect a resonance of electron neutrinos (anti-neutrinos). At Super- Kamiokande (SK), the signal from resonance is obscured by tau neutrinos arising from the oscillation of the atmospheric neutrino flux. Consequently, the sensitivity of SK towards mass-ordering depends on its ability to effectively remove the background of oscillated tau neutrinos. We present the latest measurement of tau neutrino appearance at SK and potential enhancements to the experiment's sensitivity to the neutrino mass-ordering by constraining tau neutrinos with a neural network.
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