Triplet-doublet Splitting, Proton Stability and Extra Dimension

Abstract

We propose a new possibility to reconcile the coupling unification scenario with the triplet-doublet mass splitting based on a 5-dimensional supersymmetric model with SU(5) gauge symmetry. It is shown that the minimal supersymmetric standard model is derived on a 4-dimensional wall through compactification on $S^1/(Z_2\times Z_2^{\prime })$.

Comments: 8 pages, ptptex, the version to appear in Prog. Theor. Phys