Deviations from NLO QCD evolution in inclusive HERA data

Fabrizio Caola; Stefano Forte; Juan Rojo

doi:10.1016/j.physletb.2010.02.043

Deviations from NLO QCD evolution in inclusive HERA data

Fabrizio Caola, Stefano Forte, Juan Rojo

(Astro)-Particles Physics

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Abstract

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 language	English
Pages (from-to)	127-135
Journal	Phys.Lett.B
Volume	686
Issue number	1-2
DOIs	https://doi.org/10.1016/j.physletb.2010.02.043
Publication status	Published - 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

Keywords

hep-ph

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title = "Deviations from NLO QCD evolution in inclusive HERA data",

abstract = "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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AU - Caola, Fabrizio

AU - Forte, Stefano

AU - Rojo, Juan

N1 - 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

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Y1 - 2009/10/16

N2 - 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.

AB - 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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U2 - 10.1016/j.physletb.2010.02.043

DO - 10.1016/j.physletb.2010.02.043

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EP - 135

JO - Physics Letters B

JF - Physics Letters B

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