On the effect of incident angular resolution in high-energy fixed-target collision experiments

A general calculation of the correction to the measured cross section in fixed-target experiments, due to the angular resolution of the incident beam, is carried out. A first-order expression in the incident solid angle ΔΩ is explicitly given, and shows that, in the TeV region, angular resolutions as accurate as 10- mrad are required for measurements within the cross-section forward peak. (orig.)