Kavli Affiliate: Shunsaku Horiuchi
| First 5 Authors: Zahra Tabrizi, Shunsaku Horiuchi, , ,
| Summary:
Although Galactic core-collapse supernovae (SNe) only happen a few times per
century, every hour a vast number of explosions happen in the whole universe,
emitting energy in the form of neutrinos, resulting in the diffuse supernova
neutrino background (DSNB). The DSNB has not yet been detected, but
Super-Kamiokande doped with gadolinium is expected to yield the first
statistically significant observation within the next several years. Since the
neutrinos produced at the core collapse undergo mixing during their propagation
to Earth, the flavor content at detection is a test of oscillation physics. In
this paper, we estimate the expected DSNB data at the DUNE, Hyper-K and JUNO
experiments which when combined are sensitive to all different neutrino
flavors. We determine how well the flavor content of the DSNB will be
reconstructed in the future, for a Mikheyev-Smirnov-Wolfenstein (MSW) scenario
as well as a neutrino decay scenario. A large fraction of the flavor space will
be excluded, but the heavy-lepton neutrino flux remains a challenge.
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