Search for chargino-neutralino production in {ovr p}p collisions at {radical}{ovr s} = 1.8 TeV.

We have searched for chargino-neutralino production ({tilde {xi}}{sub 1}{sup {+-}}{tilde {xi}}{sub 2}{sup 0}) in 1.8 TeV p{bar p} collisions, followed by their leptonic decays {tilde {xi}}{sub 1}{sup {+-}}{yields}{tilde {xi}}{sub 1}{sup 0}{ell}{sup {+-}}{nu} and {tilde {xi}}{sub 2}{sup 0}{yields}{tilde {xi}}{sub 1}{sup 0}{ell}{sup +}{ell}{sup -}. These trilepton events are expected within a framework of the minimal supersymmetric standard model (MSSM). In a 19.1 pb{sup -1} data sample collected with a Collider Detector at Fermilab, no trilepton events were observed. Upper limits on {sigma}(p{bar p} {yields}{tilde {xi}}{sub 1}{sup {+-}}{tilde {xi}}{sub 2}{sup 0})BR({tilde {xi}}{sub 1}{sup {+-}}{tilde {xi}}{sub 2}{sup 0}{yields}3{ell}+X) were obtained for various MSSM parameter space regions, yielding new 95% confidence level lower limits for the neutralino ({tilde {xi}}{sub 2}{sup 0}) mass which extend as high as 49 GeV/c{sup 2}.