Dynamical NNLO parton distributions and the perturbative stability of F_L(x,Q^2)

Details Dynamical NNLO parton distributions and the perturbative stability of F_L(x,Q^2) Dynamical NNLO parton distributions and the perturbative stability of F_L(x,Q^2)

2007-11-08

arxiv.org/abs/0711.1248v2

Phys.Rev.D77:074002,2008; Erratum-ibid.D78:019902,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 1 table, 5 figures; references added

Scientific paper

10.1103/PhysRevD.77.074002

It is shown that the previously noted extreme perturbative NNLO/NLO instability of the longitudinal structure function F_L(x,Q^2) 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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