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The angular distribution of lepton pairs produced via the qq̄ annihilation process is studied through O(αₛ²) in perturbative QCD. Asymmetries for single-spin experiments are found to be very small in this channel. This provides an interesting new QCD test in forthcoming π^-p^↑ experiments. The smallness of of the result is intimately related to the gauge structure of the theory and to the color coefficient associated with the qq̄ subprocess.
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Pire et al. (1983) studied this question.
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