Search for scalar leptoquarks in the acoplanar jet topology in ppbar   collisions at sqrt(s)=1.96 TeV
  A search for leptoquarks has been performed in 310 pb-1 of data from ppbar collisions at a center-of-mass energy of 1.96 TeV, collected by the D0 detector at the Fermilab Tevatron Collider. The topology analyzed consists of acoplanar jets with missing transverse energy. The data show good agreement with standard model expectations, and a lower mass limit of 136 GeV has been set at the 95% C.L. for a scalar leptoquark decaying exclusively into a quark and a neutrino. 
D0 Collaboration, V.M. Abazov, et al