Limits on quark compositeness from high energy jets in $\overline{p}p$ collisions at 1.8 TeV

Events in $\overline{p}p$ collisions at $\sqrt{s}=1.8\mathrm{}\mathrm{TeV}$ with total transverse energy exceeding $500\hspace{0.5em}\mathrm{GeV}$ 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 $2.0\hspace{0.5em}\mathrm{TeV}$ at 95% confidence on the energy scale ${\Lambda }_{\mathrm{LL}}$ for compositeness in quarks, assuming a model with a left-left isoscalar contact interaction term. The limits on ${\Lambda }_{\mathrm{LL}}$ are found to be insensitive to the sign of the interference term in the Lagrangian.