Limits on quark compositeness from high energy jets in [formula presented] collisions at 1.8 TeV

Abstract

Events in (Formula presented) collisions at (Formula presented) with total transverse energy exceeding (Formula presented) 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 (Formula presented) at 95% confidence on the energy scale (Formula presented) for compositeness in quarks, assuming a model with a left-left isoscalar contact interaction term. The limits on (Formula presented) are found to be insensitive to the sign of the interference term in the Lagrangian. © 2000 The American Physical Society.