Effects of $e^{-}{e}^{+}{\nu }_e$ Decays of Tau Neutrinos Near A Supernova

Abstract

We revisit the constraints implied by SN 1987 A observations on the decay rate of a multi-MeV ${\nu }_{\tau }$ decaying into the visible channel ${\nu }_{\tau }\to e^{+}{e}^{-}{\nu }_e$, if its lifetime is more than 10 {\it sec.}. We discuss its implication for the minimal left-right symmetric model with see-saw mechanism for neutrino masses. We also speculate on the possible formation of a ``giant Capacitor" in intergalactic space due to the decay of "neutronization" ${\nu }_{\tau }$'s and spin allignment possibility in the supernova.

Comments: 29 Pages, Tex file, UMDHEP 94-42