2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/149059I discuss the production of leptoquarks in $p\bar{p}$ collisions at the Fermilab Tevatron. Evaluated on the basis of a recent next-to-leading order calculation, the combined D0 and CDF leptoquark searches lead to a parameter-free lower mass bound of about $\ms \simgt 240$ GeV for scalar leptoquarks or squarks decaying solely to a first generation charged lepton plus quark. These results provide very stringent constraints on any explanation of the recently observed HERA excess events in terms of new particle production.LaTeX, 10 pages, 4 figures; uses epsfig, amstex, amssymb, iopconf1 styles. Talk presented at ``Beyond the Desert 97'' -- Accelerator and Non-Accelerator Approaches, Castle Ringberg, Tegernsee, Germany, 8-14 June 1997, to appear in the proceedings. Comment on mass bounds for 2nd and 3rd generation squarks addedHigh Energy Physics - Phenomenologytext