Energetic hadron jets at TeV energies

We use recently measured proton gluon distributions to revise previous QCD perturbation-theory calculations of very-large-$p_{\perp }$ ${\pi }^0$ and jet inclusive predictions. The CERN ISR large-$p_{\perp }$ ${\pi }^0$ inclusive cross sections and new hard-jet inclusive cross sections from the CERN $\overline{p}p$ collider are well described with a common cutoff $\Lambda$ and no other adjustable parameters, using the one-loop coupling parameter $\alpha \left(Q^2\right)$. Predictions are made for large-$p_{\perp }$ ${\pi }^0$ production at the Fermilab collider, Tevatron I, and a hypothetical future collider of c.m. energy 10 or 20 TeV. As the energy increases, the gluon-gluon collisions are predicted to become more and more significant, exceeding 60% at 20-TeV energies for $p_{\perp }$ up to 500 GeV/c.