We use ISAJET to perform a detailed study of the multilepton signals expected from cascade decays of supersymmetric particle produced at the CERN LHC. Our analysis is performed within the framework of the minimal supergravity model with gauge coupling unification and radiative electroweak symmetry breaking. We delineate the regions of parameter space where jets plus missing energy plus 1, 2 (opposite sign and same-sign dileptons), and 3 isolated lepton events should be visible above standard model backgrounds. We find that if any E / T signal at the LHC is to be attributed to gluino and/or squark production, and if mg < ∼ 1 TeV, then several of these signals must be simultaneously observable. Furthermore, assuming 10 fb −1 of integrated luminosity, we find that the reach for supersymmetry in the 1ℓ + jets + E / T channel extends to mg ∼ 2300 (1600) GeV for mq ∼ mg (mq ∼ 1.5mg), and exceeds the corresponding reach in the 0ℓ + E / T channel. We show that measurements of the various topological cross sections, jet and B-hadron multiplicities in these events, together with the charge asymmetry for single lepton and samesign dilepton events, and flavor asymmetry for opposite sign dilepton events, serve to narrow the allowed range of underlying SUGRA parameter values. We also delineate parameter regions where signals with clean isolated dilepton (from slepton production) and trilepton events (from chargino/neutralino production) are visible at the LHC, and examine the extent to which these signals can be separated from other SUSY sources.

We study the prospects for detecting the sleptons of the Minimal Supersymmetric Standard Model at hadron colliders and supercolliders. We use ISAJET 7.03 to simulate charged slepton and sneutrino pair production, incorporating slepton and sneutrino cascade decays into our analysis. We find that even with an accumulation of ∼ 1fb −1 of integrated luminosity, it will be very difficult to detect sleptons beyond the reach of LEP at the Fermilab Tevatron pp collider, due to a large background from W pair production. At LHC, sleptons of mass up to 300 GeV ought to be detectable via dilepton signal as long as it is possible to veto central jets with p T ≥ 25 GeV with high efficiency.