Can we trust small x resummation?
arXiv:0901.1294 · doi:10.1016/j.nuclphysbps.2009.03.114
Abstract
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.
12 pages, 12 figures; LaTeX with espcrc2.sty. Talk given at the 2008 Ringberg workshop "New Trends in HERA Physics"
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- TMD PDFs: a Monte Carlo implementation for the sea quark distribution
- High energy resummation of direct photon production at hadronic colliders
- Small x resummation in collinear factorisation
- Resummation of small x contributions to hard-scattering amplitudes