IR-Renormalon Contribution to the Longitudinal Structure Function FL
Abstract
The available data on FL suggest the existence of unexpected large higher twist contributions. We use the 1/Nf expansion to analyze the renormalon contribution to the coefficient function of the longitudinal structure function FLp-n. The renormalon ambiguity is calculated for all moments of the structure function thus allowing to estimate the contribution of ``genuine'' twist-4 corrections as a function of Bjorken-x. The predictions turn out to be in surprisingly good agreement with the experimental data.
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