We present a new and novel synthesis of all existing neutrino data regarding the disappearance and appearance of ${\nu }_e$ and ${\nu }_{\mu }.$ We assume four neutrinos: ${\nu }_e,{\nu }_{\mu },{\nu }_{\tau },$ as well as a heavier singlet neutrino ${\nu }_s$ of a few eV. The latter may decay into a massless Goldstone boson (the singlet Majoron) and a linear combination of the doublet antineutrinos. We comment on how this scenario may be verified or falsified in future experiments. We point out how it allows us to evade the CDHSW constraints.

• Received 27 August 1999

DOI:https://doi.org/10.1103/PhysRevD.61.071302