Search for the Supersymmetric Partner of the Top Quark in Dilepton Events from p-pbar Collisions at 1.8 TeV

TL;DR

This paper reports a search for the supersymmetric partner of the top quark in proton-antiproton collisions, setting limits on its mass based on the absence of observed signals in dilepton events.

Contribution

The study provides the first experimental limits on stop quark production in dilepton events at 1.8 TeV collision energy within the MSSM framework.

Findings

No evidence of stop production was observed.

Excluded stop masses between 80 and 135 GeV/c^2 at 95% confidence level.

Set upper limits on the stop production cross section.

Abstract

We have searched for the supersymmetric partner of the top quark (stop) in 107 pb^{-1} of p-pbar collisions at \sqrt{s}= 1.8 TeV collected by the Collider Detector at Fermilab (CDF). Within the framework of the Minimal Supersymmetric extension of the Standard Model (MSSM) each of the pair-produced stops is assumed to decay into a lepton, bottom quark and supersymmetric neutrino. Such a scenario would give rise to events with two leptons, two hadronic jets, and a substantial imbalance of transverse energy. No evidence of such a stop signal has been found. We calculate a 95% confidence level (C.L.) upper limit on the stop production cross section, which excludes stop masses in the region (80<m_{\stop}<135 GeV/c^2) in the mass plane of stop versus sneutrino.