Study of a LikeSign Dilepton Search for CharginoNeutralino Production at CDF.pdf

Study of a Like-Sign Dilepton Search for Chargino-Neutralino Production at CDF Jane Nachtman, David Saltzberg, Matthew Worcester ∗ for the CDF Collaboration Department of Physics and Astronomy, University of California, Los Angeles We propose a like-sign dilepton search for chargino-neutralino production in p¯p collisions at √s = 1.8 TeV, which complements the previously published trilepton search by the CDF detector using Fermilab Run I data. Monte Carlo predictions for the signal and background efficiencies indicate a significant increase in sensitivity to chargino-neutralino production compared to the traditional trilepton analysis alone. 9 I. INTRODUCTION 9 9 Previous searches for chargino-neutralino production at the Tevatron have focused primarily on signatures with 1 three charged leptons (trileptons) plus missing transverse energy (E T ) [1]. In the Minimal Supersymmetric (SUSY) b e Standard Model, chargino-neutralino production occurs in proton-antiproton (p¯p) collisions via a virtual W (s channel) F or a virtual squark (t channel). In a representative minimal Supergravity (SUGRA) model (parameters: 0, tan β = 2 2 9 2, A0 = 0, m0 = 200 GeV/c , m1/2 = 90−140 GeV/c ), we expect three-body chargino and neutralino decays through 2 virtual bosons and sleptons in a chargino mass region of 80 − 130 GeV/c . Conserving R-parity, these decays produce 1 v a distinct signat