Deviations from NLO QCD evolution in inclusive HERA data

Fabrizio Caola, Stefano Forte, Juan Rojo

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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.
Original languageEnglish
Pages (from-to)127-135
Issue number1-2
Publication statusPublished - 16 Oct 2009

Bibliographical note

Final version (to be published in PLB), new plots in fig. 5 and new column in tab. 4 added, fig. 10 added, discussion on distances on pag. 8 added, typos corrected


  • hep-ph


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