We report the result of a search for charginos and neutralinos, in e(+)e(-)
collisions at 189 GeV centre-of-mass energy at LEP, No evidence for such p
articles is found in a data sample of 176 pb(-1). Improved upper limits for
these particles are set on the production cross sections. New exclusion co
ntours in the parameter space of the Minimal Supersymmetric Standard Model
are derived, as well as new lower limits on the masses of these supersymmet
ric particles. 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
neutralino of 32.5 GeV, and a limit on the mass of the lightest chargino of
67.7 GeV for M-2 < 2TeV. (C) 2000 Published by Elsevier Science B.V. All r
ights reserved.