Limits on quark compositeness from high energy jets in p̅p collisions at 1.8 TeV

Events in (p) over bar p collisions at root s = 1.8 TeV with total transverse energy exceeding 500 GeV are used to set limits on quark substructure. The data are consistent with next-to-leading order QCD calculations. We set a lower limit of 2.0 TeV at 95% confidence on the energy scale Lambda(LL) for compositeness in quarks. assuming a model with a left-left isoscalar contact interaction term. The limits on Lambda(LL) are found to be insensitive to the sign of the interference term in the Lagrangian.