$SU(5)\times SU(5)$ Unification, Seesaw Mechanism and R-Conservation

Abstract

A new supersymmetric grand unified model based on the gauge group $SU(5)\times SU(5)$ is discussed. The model has the feature that the conventional seesaw mechanism for neutrino masses is implemented using the $(15,1)+(1,\overline{15)}$ representation. This multiplet may have a better chance of arising from level two compactification of superstring theories than the the $bf\overline{126}$ representation used in the SO(10) model. The model also naturally suppresses all R-parity violating interactions.

Comments: Plain latex, 9 pages; No figures