Suppression of Proton Decay in the Missing-Partner Model for Supersymmetric SU(5) GUT

Abstract

The Peccei-Quinn symmetric extension of the missing-partner model in the supersymmetric SU(5) grand unified model is consistent with the observed stability of the proton, even in the large $\tan {\hat{I}}^2$ region ($\simeq 50-60$) expected from the Yukawa unification. Moreover, the SU(5) gauge coupling constant remains small enough for the perturbative description of GUT's below the gravitational scale.

Talk given at Yukawa International Seminar '95: from the Standard Model to Grand Unified Theories, Kyoto, Japan, August. 21-26