Search for 3- and 4-body decays of the scalar top quark in p̅p collisions at √s = 1.8 TeV

Abstract

We have searched for the signature of 3- and 4-body decays of pair-produced scalar top quarks (stop) in the inclusive final state containing an electron, a muon, and significant missing transverse energy using a sample of pp̅ events corresponding to 108.3 pb^-1 of data collected with the DØ detector at Fermilab. The search is done in the framework of the minimal supersymmetric standard model assuming that the neutralino (χ₁^~0) is the lightest supersymmetric particle and is stable. No evidence for a signal is found and we derive cross-section upper limits as a function of stop (t^~) and neutralino masses in different decay scenarios leading to the blνχ₁^~0 final state.