Abstract
Single-particle and two-particle inclusive cross sections for p+A\ensuremath{\rightarrow}hadrons at high ${P}_{\ensuremath{\perp}}$ are studied using QCD in a multiple-scattering expansion. Single-particle cross sections are shown to be infrared divergent. In contrast with this, the leading contribution to nonplanar two-particle inclusive scattering is calculated without a cutoff. The result is consistent with the available data, but a large bremsstrahlung background masks the multiple-scattering signal. This background can be eliminated by studying the forward/backward asymmetry of the events in the projectile-nucleon c.m. system. This asymmetry is \ensuremath{\sim}0.1 on a W target at 800-GeV laboratory energy and is sensitive to the small-x structure of the target.
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