Can we trust small x resummation?

Details Can we trust small x resummation? Can we trust small x resummation?

2009-01-09

arxiv.org/abs/0901.1294v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 12 figures; LaTeX with espcrc2.sty. Talk given at the 2008 Ringberg workshop "New Trends in HERA Physics"

Scientific paper

We review the current status of small x resummation of evolution of parton distributions and of deep-inelastic coefficient functions. We show that the resummed perturbative expansion is stable, robust upon different treatments of subleading terms, and that it matches smoothly to the unresummed perturbative expansions, with corrections which are of the same order as the typical NNLO ones in the HERA kinematic region. We discuss different approaches to small x resummation: we show that the ambiguities in the resummation procedure are small, provided all parametrically enhanced terms are included in the resummation and properly matched.

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