Abstract
Searches for scalar top and scalar bottom quarks, as well as for mass-degenerate scalar quarks of the first two families are performed at 189 GeV centre-of-mass energy with the L3 detector at LEP. No signals are observed. Model-independent limits on the scalar top production cross sections are determined for the decay modes t ̃ 1 → c χ ̃ 1 0 and t ̃ 1 → bℓ ν ̃ . For scalar quarks of the other flavours q ̃ → q χ ̃ 1 0 decays are considered. Within the framework of the Minimal Supersymmetric Standard Model mass limits are set at 95% C.L. for these particles. Indirect limits on the gluino mass are also derived.
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