We present the preliminary results of a search for leptoquark ($LQ$) pairs using (85.2 $\pm$ 3.7) pb$^{ -1}$ of $p{ \bar p}$ collider data collected by the DO experiment at the Fermilab Tevatron from 1994-1996. We observe no evidence for leptoquark production and set a limit on $\sigma (p{ \bar p} \to LQ\bar{ LQ} \to \nu\nu + jets)$ as a function of the mass of the leptoquark ($M_{ LQ}$), assuming BR($LQ \to \nu q$)=100%. At the 95% confidence level, we exclude scalar leptoquarks for $M_{ LQ} < 99 GeV/c^2$, and vector leptoquarks for $M_{ LQ} < 178 GeV/c^2$.
Categories: hep-ex