The chargino-neutralino production is one of the most promising SUSY processes that could be observed at the Tevatron. Cross sections of the order of 0.1 pb have not been excluded yet under the mSUGRA scenario, whereas the trilepton signature of the process is not contaminated by significant standard model backgrounds. We report on the status of CDF search for chargino-neutralino production at the Tevatron by presenting the results of five multilepton subanalyses as well as the result of their combination which leads to our current lower limit on the chargino mass of 127 GeV/c{sup 2} and upper limit on the production cross section times branching ratio to leptons of 0.25 pb at 95% confidence level.

We have searched for evidence of supersymmetry with the Collider Detector at Fermilab using trilepton events in p{anti p} collisions at √s = 1.8 TeV. In the Minimal Supersymmetric Standard Model (MSSM), we expect trilepton events from chargino-neutralino ({tilde {xi}}{sup {+-}}1{tilde {xi}}°2) pair production, with subsequent decay into leptons. In all possible combinations of electron and muon channels, we observe no candidate events in 107 pb−1 of data. We present limits on chargino and neutralino production within the framework of a supergravity inspired MSSM: [sigma]{sub {tilde {xi}}{sup {+-}}1{tilde {xi}}°2} · BR({tilde {xi}}{sup {+-}}1{tilde {xi}}°2 → 3l + X) 0.34 pb and M{sub {tilde {xi}}{sup {+-}}1} 81.5 GeV/c2 for tan [beta] = 2, [mu] = -600 GeV/c2 and M{sub {tilde q}} = M{sub {tilde g}}. We also present limits on a SU(5) x U(1) supergravity model and a 4 and 1/2 parameter Minimal SUGRA model.

We have searched for evidence of supersymmetry with 1 $fb^-1$ with collected with low-$p_T$ dimuon triggers of the Collider Detector on Tevatron Run II, at Fermilab. We looked for trilepton events in $p\bar{p}$ collisions at $\sqrt{s} = 1.96$ TeV. In the Minimal Supersymmetric Standard Model (MSSM) we expect chargino-neutralino pair production, with subsequent decay into three isolated leptons. We observe one event of three isolated muons, a possible hint of supersymmetry.

The authors present a search for the associated production of charginos and neutralinos in p{bar p} collisions at (square root)s = 1.96 TeV. The data were collected at the Collider Detector at Fermilab (CDF II) and correspond to integrated luminosities between 0.7 and 1.0 fb−1. They look for final states with one high-p{sub T} electron or muon, and two additional leptons. The results are consistent with the standard model expectations, and they set limits on the cross section as a function of the chargino mass in three different supersymmetric scenarios. For a specific MSSM scenario with no slepton mixing they set a 95% C.L. limit at 151 GeV/c2.

Preliminary results from a search for the production of an associated lightest chargino, W1, and second lightest neutralino, Z2, pair with the D0 detector at Fermilab's pp collider with (square root)s = 1.8 TeV are presented. Based on approximately 85 pb−1 of data collected during the 1993-1995 Tevatron Runs we set a 95% C.L. upper limit on the chargino-neutralino cross section times branching fraction to any trileptonic final state ranging from 0.91 pb to 0.19 pb for wino masses ranging from 45 GeV/c2 to 96 GeV/c2.