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 $W^{\pm }$ and $Z^0$ mass, respectively, are examined. A lower bound on the $W$-ino mass of ≃ 30 GeV is obtained with an upper bound of ≃ 250 GeV on the Higgs mass. It is shown that the $Z^0$ decays prominantly into two $W$-inos if the mass of the $W-\mathrm{ino}<~\frac{M_W}{2}$. The superpartners of quarks and leptons are shown to be approximately degenerate and in some models have mass ≲ 100 GeV.