Testing Quantum Chromodynamics in the Hadroproduction of Real and Virtual Photons

We examine tests of quantum chromodynamics in the production of lepton pairs in hadronic collisions. We emphasize the need for detailed experimental studies of the transverse spectra of lepton pairs. As a further test, we calculate the production of real photons at high transverse momentum. $\frac{\gamma }{\pi }$ ratios at the 10% level are predicted for $p_T=4-6\mathrm{}$ GeV, with $(pp\to \gamma X)\simeq (pp\to \pi X)$ at $p_T\simeq 10$ GeV.