### Abstract

I review the effects of flavor conversion of neutrinos from stellar collapse due to masses and mixing, and discuss the motivations for their study. I consider in detail the sensitivity of certain observables (characteristics of the energy spectra of ν_{e} and ν¯_{e} events) to the 13-mixing (sin^{2} θ_{13}) and to the type of mass hierarchy/ordering (sign[∆m^{2}
_{13}]). These observables are: the ratio of average energies of the spectra, r_{E} ≡ hEi/hĒi, the ratio of widths of the energy distributions, r_{Γ} ≡ Γ/Γ, ^{¯} the ratios of total numbers of ν_{e} and ν¯_{e} events at low energies, S, and in the high energy tails, R_{tail}. I show that regions in the space of observables r_{E}, r_{Γ}, R_{tail} exist in which certain mass hierarchy and intervals of sin^{2} θ_{13} can be identified or discriminated. Finally, I discuss the potential of studying regeneration effects on ν_{e} and ν¯_{e} in the matter of the Earth and point out that both the observation or exclusion of these effects lead to model-independent information on sin^{2} θ_{13} and the mass hierarchy.

Original language | English (US) |
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Journal | Proceedings of Science |

Volume | 10 |

State | Published - Jan 1 2003 |

Externally published | Yes |

Event | 2003 International Workshop on Astroparticle and High Energy Physics, AHEP 2003 - Valencia, Spain Duration: Oct 14 2003 → Oct 18 2003 |

### ASJC Scopus subject areas

- General