Searches for prompt light gravitino signatures in e+e- collisions at √s = 189 GeV

Searches for final states expected in models with light gravitinoshave been performed, including exptl. topologies with multi- leptonswith missing energy, leptonsand photons with missing energy, and jets and photons with missing energy. No excess over the expectations from the Std. Model has been obsd. Limits are placed on prodn. cross-sections in the different exptl. topologies. Addnl., combining with searches for the anomalous prodn. of leptonand photon pairs with missing energy, results are interpreted in the context of minimal modelsof gauge mediated SUSY breaking. Exclusion limits at the 95% confidence level on the supersym. particle masses of ml~> 83 GeV and mc~10> 85 GeV for tanb=2, and mt~> 69 GeV, me~,m~> 88 GeV and mc~10> 76 GeV for tanb=20, are established. [on SciFinder (R)]