SIGNALS FOR MINIMAL SUPERGRAVITY AT THE CERN LARGE HADRON COLLIDER .2. MULTILEPTON CHANNELS

We use ISAJET to perform a detailed study of the multilepton signals e xpected from cascade decays of supersymmetric particle produced at the CERN LHC. Our analysis is performed within the framework of the minim al supergravity model with gauge coupling unification and radiative el ectroweak symmetry breaking. We delineate the regions-of parameter spa ce where jets plus missing energy plus 1, 2 (opposite-sign and same-si gn dileptons), and 3 isolated lepton events should be visible above st andard model backgrounds. We find that if any E(T) signal at the LHC i s to be attributed to gluino and/or squark production, and if m((g) ov er tilde)less than or similar to 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 m((g) over tilde) 2300(1600) GeV for m((q) over tilde)similar to m((g) over tilde)(m((q) over tilde)simila r to 1.5m((g) over tilde)), and exceeds the corresponding reach in the Ol+E(T) channel. We show that measurements of the various topological cross sections, jet, and B-hadron multiplicities in these events, tog ether with the charge asymmetry for single lepton and same-sign dilept on events, and flavor asymmetry for opposite-sign dilepton events, ser ve to narrow the allowed range of underlying SUGRA parameter values. W e also delineate parameter regions where signals with clean isolated d ilepton (from slepton production) and trilepton events (from chargino or neutralino production) are visible at the LHC, and examine the exte nt to which these signals can be separated from other SUSY sources.