Search for Chargino-Neutralino Associated Production at the Fermilab Tevatron Collider

Abstract

We have searched in $p\bar{p}$ collisions at $\sqrt{s}$ = 1.8 TeV for events with three charged leptons and missing transverse energy. In the Minimal Supersymmetric Standard Model, we expect trilepton events from chargino-neutralino ($\chione \chitwo$) pair production, with subsequent decay into leptons. We observe no candidate $e^{+}{e}^{-}{e}^{\pm }$, $e^{+}{e}^{-}{\mu }^{\pm }$, $e^{\pm }{\mu }^{+}{\mu }^{-}$ or ${\mu }^{+}{\mu }^{-}{\mu }^{\pm }$ events in 106 pb${}^{-1}$ integrated luminosity. We present limits on the sum of the branching ratios times cross section for the four channels: $σ_{\chione\chitwo}\cdot $BR$(\chione\chitwo\to 3\ell+X) < 0.34$~pb, M$_\chione > $ 81.5 \mgev\sp and M$_\chitwo > $ 82.2 \mgev\sp for $\tan \beta =2$, $\mu =-600$~\mgev\sp and M$_\squark=$ M$_\gluino$.

9 pages and 3 figures

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