Masses of Superpartners of Quarks, Leptons, and Gauge Mesons in Supergravity Grand Unified Theories

Abstract

A class of "realistic" supergravity grand-unified-theory models possessing two $W$-inos and two $Z$-inos which lie above and below ${W}^{\ifmmode\pm\else\textpm\fi{}}$ and ${Z}^{0}$ mass, respectively, are examined. A lower bound on the $W$-ino mass of \ensuremath{\simeq} 30 GeV is obtained with an upper bound of \ensuremath{\simeq} 250 GeV on the Higgs mass. It is shown that the ${Z}^{0}$ decays prominantly into two $W$-inos if the mass of the $W\ensuremath{-}\mathrm{ino}<~\frac{{M}_{W}}{2}$. The superpartners of quarks and leptons are shown to be approximately degenerate and in some models have mass \ensuremath{\lesssim} 100 GeV.