We report the result of a search for scalar leptons in e(+)e(-) collisions
at 189 GeV centre-of-mass energy at LEP. No evidence for such particles is
found in a data sample of 176 pb(-1). Improved upper limits are set on the
production cross sections for these new particles. New exclusion contours i
n the parameter space of the Minimal Supersymmetric Standard Model are deri
ved, as well as new lower limits on the masses of these supersymmetric part
icles. Under the assumptions of common gaugino and scalar masses at the GUT
scale, we set an absolute lower limit on the mass of the lightest scalar e
lectron of 65.5 GeV. (C) 1999 Published by Elsevier Science B.V. All rights
reserved.