Neutrino Unification

Abstract

Present neutrino data are consistent with neutrino masses arising from a common seed at some ``neutrino unification'' scale $M_X$. Such a simple theoretical ansatz naturally leads to quasi-degenerate neutrinos that could lie in the electron-volt range with neutrino mass splittings induced by renormalization effects associated with supersymmetric thresholds. In such a scheme the leptonic analogue of the Cabibbo angle ${\theta }_{\odot }$ describing solar neutrino oscillations is nearly maximal. Its exact value is correlated with the smallness of ${\theta }_{reactor}$. These features agree both with latest data on the solar neutrino spectra and with the reactor neutrino data. The two leading mass-eigenstate neutrinos present in \ne form a pseudo-Dirac neutrino, avoiding conflict with neutrinoless double beta decay.

Comments: RevTex format, 2 figures, 4 pages, a few new references, no other important change, figures unchanged, version to be published in PRL