SN1987A and neutrino non-radiative decay

Understand

We investigate neutrino non-radiative two-body decay in vacuum, in relation to SN1987A.

• In a full $3\nu$ decay framework, we perform a detailed likelihood analysis of the 24 neutrino events from SN1987A observed by Kamiokande-II, IMB, and Baksan.
• We consider both normal and inverted neutrino mass orderings, and the possibility of strongly hierarchical and quasi-degenerate neutrino mass patterns.
• The results of the likelihood analysis show that the sensitivity is too low to derive bounds in the case of normal mass ordering.