Supersymmetry dileptons and trileptons at the Tevatron

Abstract

We consider the production of supersymmetry neutralinos and charginos in $p\bar p$ collisions at the Tevatron, and their subsequent decay via hadronically quiet dileptons and trileptons. We perform our computations in the context of a variety of supergravity models, including generic four-parameter supergravity models, the minimal $SU(5)$ supergravity model, and $SU(5)\times U(1)$ supergravity with string inspired two- and one-parameter moduli and dilaton scenarios. Our results are contrasted with estimated experimental sensitivities for dileptons and trileptons for integrated luminosities of 100\ipb and 1\ifb, which should be available in the short and long terms. We find that the dilepton mode is a needed complement to the trilepton signal when the latter is suppressed by small neutralino leptonic branching ratios. The estimated reaches in chargino masses can be as large as 100\,(150)\GeV for 100\ipb\,(1\ifb). We also discuss the task left for LEPII once the Tevatron has completed its short-term search for dilepton and trilepton production.Comment: 12 pages (LaTeX), 6 figures (included