IR-Renormalon Contribution to the Longitudinal Structure Function $F_L$

Details IR-Renormalon Contribution to the Longitudinal Structure Function $F_L$ IR-Renormalon Contribution to the Longitudinal Structure Function $F_L$

1996-01-29

arxiv.org/abs/hep-ph/9601356v2

Phys.Lett. B376 (1996) 177-185

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, latex, including 1 figure, revised version with two reference added, no changes to the paper

Scientific paper

10.1016/0370-2693(96)00275-4

The available data on $F_L$ suggest the existence of unexpected large higher twist contributions. We use the $1/N_f$ expansion to analyze the renormalon contribution to the coefficient function of the longitudinal structure function $F_L^{p-n}$. 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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