Search for Scalar Leptoquarks from Z0 Decays

We have searched for pair produced scalar leptoquarkseach decaying to a quark and a charged lepton in a sample of 116 000 hadronic Z0 events produced at LEP. No candidate was detected and cross section and branching ratio limits are set for the above process at 95% CL. Mass limits are found to be about 42 GeV/c2 depending only slightly on the models used and a coupling times branching ratio exclusion line is drawn for a scalar leptoquarkwith a free coupling. We have also probed the mass region above 45 GeV/c2 for a singly produced scalar leptoquarkand set limits on the cross section and the coupling λ2/4π up to 60 GeV.