How much do neutrinos live and weigh?
Federica Pompa, Olga Mena

TL;DR
This paper explores how future large neutrino detectors can set improved bounds on neutrino mass and lifetime by analyzing supernova neutrino signals, including time delays and flux suppression effects.
Contribution
It demonstrates the potential of Hyper-Kamiokande to significantly improve bounds on neutrino properties using supernova neutrino data, especially considering elastic scattering events.
Findings
Lower bound on neutrino lifetime: τ/ m > 4×10^5 s/eV at 95% CL.
Upper bound on neutrino mass: 0.34 eV at 95% CL.
Mass and lifetime bounds are independent of mass ordering.
Abstract
The next-generation water Cherenkov Hyper-Kamiokande detector will be able to detect thousands of neutrino events from a galactic Supernova explosion via Inverse Beta Decay processes followed by neutron capture on Gadolinium. This superb statistics provides a unique window to set bounds on neutrino properties, as its mass and lifetime. We shall explore the capabilities of such a future detector, constraining the former two properties via the time delay and the flux suppression induced in the Supernovae neutrino time and energy spectra. Special attention will be devoted to the statistically sub-dominant elastic scattering induced events, normally neglected, which can substantially improve the neutrino mass bound via time delays. When allowing for a invisible decaying scenario, the C.L. lower bound on is almost one order of magnitude better than the one found with SN1987A…
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Taxonomy
TopicsNeutrino Physics Research · Particle physics theoretical and experimental studies · Radiation Detection and Scintillator Technologies
