Search For Pair Production of Scalar Top Quarks in R-parity Violating Decay Modes in ppbar Collisions at sqrt{s} = 1.8 TeV

TL;DR

This paper reports a search for scalar top quark pair production in R-parity violating supersymmetry at Fermilab, finding no candidate events and setting a lower mass limit of 122 GeV/c2.

Contribution

First search for scalar top quarks decaying into tau and b in ppbar collisions at 1.8 TeV, establishing new mass limits in this decay mode.

Findings

No candidate events observed.

Lower mass limit of 122 GeV/c2 for scalar top quark.

Constraints on R-parity violating supersymmetry.

Abstract

We present the results of a search for pair production of scalar top quarks in an R-parity violating supersymmetry scenario in 106 pb-1 of ppbar collisions at $\sqrt{s} = 1.8$ TeV collected by the Collider Detector at Fermilab. In this mode each scalar top quark decays into a tau lepton and a b quark. We search for events with two tau's, one decaying leptonically (e or mu) and one decaying hadronically, and two jets. No candidate events pass our final selection criteria. We set a 95% confidence level lower limit on the scalar top quark mass at 122 GeV/c2 for Br (stop-> tau + b) = 1.