New Signals for Gluinos and Squarks of Supergravity at the Tevatron Collider

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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/ISASUSY 1.0, we evaluate the multilepton signals from cascade decays of gluinos and squarks produced at the Fermilab Tevatron p p collider assuming squark and slepton masses are related as in supergravity models. We find observable cross sections for spectacular event topologies: m-lepton + n-jet + events (m ≤ 4, n ≥ 2) and same-sign dilepton + 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 300 GeV if m m and O(1000) pb⁻¹ of data are collected.