Resolving ambiguities in the neutrino mass-flavour spectrum from supernova neutrinos

TL;DR

This paper investigates how supernova neutrino observations can clarify neutrino properties, including mass hierarchy and mixing parameters, by analyzing flavor conversions within a supernova and their impact on detected spectra.

Contribution

It introduces a method to resolve neutrino spectrum ambiguities from supernovae, enabling determination of the solar neutrino solution, mass hierarchy sign, and small mixing matrix elements.

Findings

Potential to identify the solar neutrino solution

Ability to determine the sign of Δm²_{32}

Probing |U_{e3}|² down to 10^{-4}-10^{-3}

Abstract

We analyze the neutrino conversions inside a supernova in the 3$\nu$ mixing scheme, and their effects on the neutrino spectra observed at the earth. We find that the observations of the energy spectra of neutrinos from a future galactic supernova may enable us to identify the solar neutrino solution, to determine the sign of $\Delta m^2_{32}$, and to probe the mixing matrix element |U_{e3}|^2 to values as low as 10^{-4}-10^{-3}.