Search for Chargino-Neutralino Production in $p \bar{p}$ Collisions at $\sqrt s = 1.8 TeV$

We have searched for chargino-neutralino production

({\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0})

in 1.8 TeV

p \bar{p}

collisions, followed by their leptonic decays

{\tilde{χ}}_{1}^{\pm} \to {\tilde{χ}}_{1}^{0} ℓ^{\pm} ν

and

{\tilde{χ}}_{2}^{0} \to {\tilde{χ}}_{1}^{0} ℓ^{+} ℓ^{-}

. These trilepton events are expected within a framework of the minimal supersymmetric standard model (MSSM). In a

19.1 {pb}^{- 1}

data sample collected with a Collider Detector at Fermilab, no trilepton events were observed. Upper limits on

σ (p \bar{p} \to {\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0}) ̇ BR ({\tilde{χ}}_{1}^{\pm} {\tilde{χ}}_{2}^{0} \to 3 ℓ + X)

were obtained for various MSSM parameter space regions, yielding new 95% confidence level lower limits for the neutralino

({\tilde{χ}}_{2}^{0})

mass which extend as high as

49 GeV {/ c}^{2}

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Search for Chargino-Neutralino Production inpp¯Collisions at√s=1.8TeV