$SO(10)$ Operator Analysis For ${\nu }_{\mu }{\nu }_{\tau }$ Oscillations

Abstract

In grand unified theories the flavor mixing angles of leptons are related to those of quarks. In this paper we study SO(10) theories with a precise group theoretic relation at the GUT scale for mixing between the heaviest two generations: $\thetuto = κ\abs{\vcbo}$. A comprehensive operator search yields all possible cases where $\kappa$ is a group theory Clebsch. The resulting predictions for ${\nu }_{\mu }{\nu }_{\tau }$ oscillations are scaled from the grand to the weak scales. We find that all but one of the models which have such a relationship between $\thetuto$ and $\vcbo$, and are not already excluded, will be probed by the CHORUS and NOMAD experiments. A more precise mixing measurement, for example by the proposed P803 experiment, could distinguish between the models.

Straight Latex, 25 pages + 2 figures available by mail or fax, LBL-33936