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

TL;DR

This study searched for chargino-neutralino production in proton-antiproton collisions at 1.8 TeV, setting new limits on neutralino mass within the MSSM framework after no trilepton events were observed.

Contribution

First search for chargino-neutralino production in proton-antiproton collisions at 1.8 TeV, establishing new lower mass limits for neutralinos in the MSSM.

Findings

No trilepton events observed in data sample.

Set upper limits on production cross section times branching ratio.

Extended neutralino mass limits up to 49 GeV.

Abstract

We have searched for chargino-neutralino production (\chichi) in 1.8 TeV \ppb\sp collisions, followed by their leptonic decays \chione\dk\chizero\lnu\psp and \chitwo\dk\chizero\lplm. 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 the Collider Detector at Fermilab, no trilepton events were observed. Upper limits on $\sigma(\ppb\dk\chichi)\cdot BR(\chichi\dk 3 \ell + X)$ were obtained for various MSSM parameter space regions, yielding new 95\% confidence level lower limits for the neutralino (\chitwo) mass which extended as high as 49 \mgev.