Extending the QCD Perturbative Domain to Higher Energies

Details Extending the QCD Perturbative Domain to Higher Energies Extending the QCD Perturbative Domain to Higher Energies

2003-10-09

arxiv.org/abs/hep-ph/0310110v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk at the International Workshop on QCD: QCD@Work2003 - International Workshop on QCD, Conversano, Italy; 7 pages, 4 figures

Scientific paper

After a brief introduction to low-x QCD and to resummation approaches, I illustrate the predictions for the gluon Green function and splitting function of a recent renormalization-group improved small-x resummation scheme. I argue, on this basis, that the range of validity of perturbative calculations is considerably extended in rapidity with respect to leading log expectations. The perturbative high-energy exponents are predicted in a phenomenologically interesting range, and significant preasymptotic effects are found. In particular, the splitting function shows a shallow dip in the moderate-x region, followed by the expected small-x power increase.

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