Abstract
We present data on dimuon production by 16 GeV π + and π − beams on a Cu target. From the data we evaluate, for π −N collisions, the fraction of dimuon events that originate from the annihilation process q q ̄ → μ +μ − . Using this information the experimentally determined cross section for the process q q ̄ → μ +μ − is observed to be in agreement with the Drell-Yan model over a wide range of incident energies. The observed deviations from exact scaling are of the order predicted by QCD calculations for the Q 2-dependence of the nucleon and the pion structure function.
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