Abstract
The comparison of QCD predictions with experiment requires the inclusion of both next to leading order and higher twist terms. We propose a systematic parametrisation of structure function moments, which, in principle, permits the extraction of all these terms, and explicitly allows for the ambiguities inherent in higher order QCD predictions. An analysis of non-singlet moments using this form favours small higher twist terms, agrees closely with the leading order QCD parameters, and is consistent with the presence of next to leading QCD effects. The scale parameter Λ is determined, it ambiguities discussed and its errors estimated.
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