Dynamical next-to-next-to-leading order parton distributions and the perturbative stability of F_L(x,Q^2)

Details Dynamical next-to-next-to-leading order parton distributions and the perturbative stability of F_L(x,Q^2) Dynamical next-to-next-to-leading order parton distributions and the perturbative stability of F_L(x,Q^2)

2008-10-13

arxiv.org/abs/0810.2215v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures, 1 table, to appear in the proceedings of 14th International QCD Conference (QCD08), Montpellier, France, 7

Scientific paper

10.1016/j.nuclphysbps.2008.12.01

It is shown that the previously noted extreme perturbative instability of the longitudinal structure function F_L(x,Q^2) in the small Bjorken-$x$ region, is a mere artefact of the commonly utilized `standard' gluon distributions. In particular it is demonstrated that using the appropriate -- dynamically generated -- parton distributions at NLO and NNLO, F_L(x,Q^2) turns out to be perturbatively rather stable already for Q^2 $\geq$ O(2-3 GeV^2).

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