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Twist expansion of the nucleon structure functions, F2 and FL, in the DGLAP improved saturation model

Higher twist effects in the deeply inelastic scattering are studied. We start with a short review of the theoretical results on higher twists in QCD. Within the saturation model we perform a twist analysis of the nucleon structure functions FT and FL at small value of the Bjorken variable x. The parameters of the model are fitted to the HERA F2 data, and we derive a prediction for the longitudinal structure function FL. We conclude that for FL the higher twist corrections are sizable whereas for F2 = FT + FL there is a nearly complete cancellation of twist-4 corrections in FT and FL. We discuss a few consequences for future LHC measurements.

preprint2009arXivOpen access
Jochen BartelsKrzysztof Golec-BiernatLeszek Motyka
hep-ph
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Jochen BartelsKrzysztof Golec-BiernatLeszek Motyka

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