HERA data and DGLAP evolution: theory and phenomenology

Details HERA data and DGLAP evolution: theory and phenomenology HERA data and DGLAP evolution: theory and phenomenology

2010-07-30

arxiv.org/abs/1007.5405v2

Nucl.Phys.A854:32-44,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

Fig. 8 corrected. Published in NPA

Scientific paper

10.1016/j.nuclphysa.2010.08.009

We examine critically the evidence for deviations from next-to-leading order perturbative DGLAP evolution in HERA data. We briefly review the status of perturbative small-x resummation and of global determinations of parton distributions. We show that the geometric scaling properties of HERA data are consistent with DGLAP evolution, which is also strongly supported by the double asymptotic scaling properties of the data. However, backward--evolution of parton distributions into the low x, low Q^2 region does show evidence of deviations between the observed behaviour and the next-to-leading order predictions. These deviations cannot be explained by missing next-to-next-to-leading order perturbative terms, and are consistent with perturbative small-x resummation.

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