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We report on a search for the pair production of second generation scalarleptoquarks (LQ) in ppbar collisions at the center of mass energy sqrt(s)=1.96TeV using a data set corresponding to an integrated luminosity of 1.0 fb-1collected with the D0 experiment at the Fermilab Tevatron Collider. Topologiesarising from the LQLQbar->muqnuq and LQLQbar->muqmuq decay modes areinvestigated. No excess of data over the standard model prediction is observedand upper limits on the leptoquark pair production cross section are derived atthe 95% C.L. as a function of the leptoquark mass and the branching fractionbeta for the decay LQ->muq. These are interpreted as lower limits on theleptoquark mass as a function of beta. For beta=1 (0.5), scalar secondgeneration leptoquarks with masses up to 316 GeV (270 GeV) are excluded.

Search for pair production of second generation scalar leptoquarks