Deviations from NLO QCD evolution in inclusive HERA data

Details Deviations from NLO QCD evolution in inclusive HERA data Deviations from NLO QCD evolution in inclusive HERA data

2009-10-16

arxiv.org/abs/0910.3143v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

Final version (to be published in PLB), new plots in fig. 5 and new column in tab. 4 added, fig. 10 added, discussion on dista

Scientific paper

We search for deviations from next-to-leading order QCD evolution in HERA structure function data. We compare to data predictions for structure functions in the small x region, obtained by evolving backwards to low Q^2 the results of a parton fit performed in the large Q^2 region, where fixed-order perturbative QCD is certainly reliable. We find evidence for deviations which are qualitatively consistent with the behaviour predicted by small x perturbative resummation, and possibly also by nonlinear evolution effects, but incompatible with next-to-next-to leading order corrections.

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