Mass signature of supernova $ν_μ$ and $ν_τ$ neutrinos in SuperKamiokande

Details Mass signature of supernova $ν_μ$ and $ν_τ$ neutrinos in SuperKamiokande Mass signature of supernova $ν_μ$ and $ν_τ$ neutrinos in SuperKamiokande

1998-02-25

arxiv.org/abs/hep-ph/9802424v2

Phys.Rev.D58:053010,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages including 5 figures, to appear in Phys. Rev. D; second version has minor corrections and is in two-column form

Scientific paper

10.1103/PhysRevD.58.053010

The $\nu_\mu$ and $\nu_\tau$ neutrinos (and their antiparticles) from a Galactic core-collapse supernova can be observed in a water-\v{C}erenkov detector by the neutral-current excitation of $^{16}$O. The number of events expected is several times greater than from neutral-current scattering on electrons. The observation of this signal would be a strong test that these neutrinos are produced in core-collapse supernovae, and with the right characteristics. In this paper, this signal is used as the basis for a technique of neutrino mass determination from a future Galactic supernova. The masses of the $\nu_\mu$ and $\nu_\tau$ neutrinos can either be measured or limited by their delay relative to the $\bar{\nu}_e$ neutrinos. By comparing to the high-statistics $\bar{\nu}_e$ data instead of the theoretical expectation, much of the model dependence is canceled. Numerical results are presented for a future supernova at 10 kpc as seen in the SuperKamiokande detector. Under reasonable assumptions, and in the presence of the expected counting statistics, $\nu_\mu$ and $\nu_\tau$ masses down to about 50 eV can be simply and robustly determined. The signal used here is more sensitive to small neutrino masses than the signal based on neutrino-electron scattering.

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