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

Abstract

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 $\ge$ O(2-3 GeV^2).

4 pages, 3 figures, 1 table, to appear in the proceedings of 14th International QCD Conference (QCD08), Montpellier, France, 7-12 July 2008

References in corpus (8)

• NNLO global parton analysis
• Dynamical parton distributions of the nucleon and very small-x physics
• The Longitudinal Structure Function at the Third Order
• Parton distributions from deep-inelastic-scattering data
• Rates for Inclusive Deep-Inelastic Electroproduction of Charm Quarks at HERA
• The role of F_L(x,Q^2) in parton analyses
• Dynamical NNLO parton distributions and the perturbative stability of F_L(x,Q^2)
• The curvature of $F_2^p(x,Q^2)$ as a probe of the range of validity of perturbative QCD evolutions in the small-$x$ region

Cited by in corpus (2)

• Extracting the longitudinal structure function FL(x,Q2) at small x from a Froissart-bounded parametrization of F2(x,Q2)
• Higher order approximations to the longitudinal structure function $F_L$ from the parametrization of $F_2$ based on the Laplace transformation