Angular distributions of two jets in pp and pp-bar collisions

Assuming that quark, antiquark, and gluon jets can be identified in $\mathrm{pp}$ and $p\overline{p}$ collisions with two high-${P}_{T}$ jets in the final state, we calculate the angular distribution for each pair of jets. Our purpose is to suggest experiments which come as close as possible to measuring the various parton-parton scattering cross sections ${\ensuremath{\Sigma}}_{\mathrm{ab}\ensuremath{\rightarrow}\mathrm{cd}}$. Our predictions for the angular distributions are based on quantum chromodynamics, but we also explore how our results would be modified if the three-gluon and four-gluon couplings were absent.