A Search forthe Scalar Top Quark in $p \bar{p}$ Collisions at $\sqrt{s}=$ 1.8 TeV

TL;DR

This paper reports a search for scalar top quark pair production in proton-antiproton collisions at 1.8 TeV, using data from the DØ detector, but finds no evidence of signal and sets limits on production cross-sections.

Contribution

First search for scalar top quark pair production in electron-muon-missing energy final states at Fermilab with new cross-section limits.

Findings

No evidence for scalar top quark production was observed.

Cross-section limits were established as functions of stop, chargino, and sneutrino masses.

The results constrain supersymmetric models with light scalar top quarks.

Abstract

We have performed a search for scalar top quark (stop) pair production in the inclusive electron-muon-missing transverse energy final state, using a sample of $p \bar{p}$ events corresponding to 108.3 pb$^{-1}$ of data collected with the D{\O}detector at Fermilab. The search is done in the framework of the minimal supersymmetric standard model assuming that the sneutrino is the lightest supersymmetric particle. For the dominant decays of the lightest stop, $\bc$ and $\bls$, no evidence for signal is found. We derive cross-section limits as a function of stop (\stt), chargino (\ca), and sneutrino (\snu) masses.