Search for the Scalar Top Quark in pp̅ Collisions at √s = 1.8 TeV

We have performed a search for scalar top quark(stop) pair productionin the inclusive electron-muon-missing transverse energy final state, using a sample of pp events corresponding to 108.3pb -1 of data collected with the D0 detector at Fermilab. The search is done in the framework of the minimal supersymmetric standard modelassuming that the sneutrino is the lightest supersymmetric particle. For the dominant decays of the lightest stop, t→bχ ~ 1 + and t→blν ~ , no evidence for signal is found. We derive cross-section limitsas a functionof stop (t ~ ), chargino(χ ~ 1 + ), and sneutrino (ν ~ ) masses.