Neutrino mass and mirror universe
arXiv:hep-ph/9503481
Abstract
The existence of the mirror world, with the same microphysics as our own one but with opposite P-asymmetry, not only restores an exact equivalence between left and right but also naturally explains, via a see-saw like mechanism, why the neutrino is ultralight.
8 pages, LaTex. Revised version, now identical with the journal publication