Abstract
We present an extension of the left-right-symmetric model by including extra singlet quarks and leptons, which leads to calculable - mixing and an ultralight Dirac mass for the neutrino. For a mass in the tera-electron-volt range, the neutrino masses can be in the right range to explain the solar neutrino puzzle via the Mikheyev-Smirnov-Wolfenstein oscillation amplification mechanism. Crucial for our results is a ‘‘see-saw’’-type mechanism for the smallness of the d-quark masses.
- Received 26 November 1986
DOI:https://doi.org/10.1103/PhysRevLett.58.1600
©1987 American Physical Society