Supersymmetry reach of the Fermilab Tevatron via trilepton, like-sign dilepton, and dilepton plus tau jet signatures - art. no. 075004.

We determine the Fermilab Tevatron's reach in supersymmetric parameter spac e in trilepton. like-sign dilepton, and dilepton plus tan-jet channels. We critically study the standard model background processes. We find larger ba ckgrounds and, hence, significantly smaller reach regions than recent analy ses. We identify the major cause of the background discrepancy. We improve signal-to-noise by introducing an invariant mass cut which takes advantage of a sharp edge in the signal dilepton invariant mass distribution. Also, w e independently vary the cuts at each point in SUSY parameter space to dete rmine the set which yields the maximal reach. We find that this cut optimiz ation can significantly enhance the Tevatron reach. [S0556-2821(99)05717-3] .