New backgrounds in trilepton, dilepton and dilepton plus tau jet SUSY signals at the tevatron

We determine the Tevatronʹs reach in supersymmetric parameter space in trilepton, like-sign dilepton, and dilepton plus tau-jet channels, taking all relevant backgrounds into account. We show results for the minimal supergravity model. With a standard set of cuts we find that the previously unaccounted for Wγ∗ background is larger than all other backgrounds combined. We include cuts on the dilepton invariant mass and the W-boson transverse mass to reduce the Wγ∗ background to a reasonable level. We optimize cuts at each point in supersymmetry parameter space in order to maximize signal-to-noise.