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Measurement of Dijet Angular Distributions and Search for Quark Compositeness
We have measured the dijet angular distribution in $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\phantom{\rule{0ex}{0ex}}\mathrm{TeV}p\overline{p}$ collisions using the D0 detector. Order ${\ensuremath{\alpha}}_{s}^{3}$ QCD predictions are in good agreement with the data. At 95% confidence limit the data exclude models of quark compositeness in which the contact interaction scale is below 2 TeV.