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[en] Transverse, single-spin asymmetries offer a chance to test QCD at the level of ''twist-3'' observables. Early suggestions that such asymmetries necessarily vanish as mq→0 or involve an extra power of αs can be refuted with a simple example. Recent experimental results support the interpretation of these data in hard-scattering QCD. The asymmetry in the scattering on nuclear targets can provide new, nontrivial information the space-time structure of the interaction
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