Within the supergravity framework, sleptons are expected to be considerably lighter than squarks if gluinos and squarks are approximately degenerate. This can lead to a significant enhancement in leptonic branching ratio for neutralinos, and, sometimes, charginos. Using isajet 7.0 and/or isasusy 1.0, we evaluate the multilepton signals from cascade decays of gluinos and squarks produced at the Fermilab Tevatron $p\overline{p}$ collider assuming squark and slepton masses are related as in supergravity models. We find observable cross sections for spectacular event topologies: $m \mathrm{lepton}+n \mathrm{jet}+E_T$ events ($m\le 4$, $n\ge 2$) and same-sign $\mathrm{dilepton}+E_T$ events and show that the SM backgrounds to the isolated trilepton, four-lepton, and same-sign dilepton signals are very small. These signals can extend the mass reach of the Tevatron experiments to $m_{\tilde{g}}\sim 300$ GeV if $m_{\tilde{g}}\sim m_{\tilde{q}}$ and ∼ (1000) ${\mathrm{pb}}^{-1\mathrm{}}$ of data are collected.

• Received 9 June 1993

DOI:https://doi.org/10.1103/PhysRevD.48.R2978