Extending QCD perturbation theory to higher energies

Preprint

22 May 2003

preprint
Published by arXiv in arXiv

Abstract

On the basis of the results of a new renormalisation group improved small-x resummation scheme, we argue that the range of validity of perturbative calculations is considerably extended in rapidity with respect to leading log expectations. We thus provide predictions for the energy dependence of the gluon Green function in its perturbative domain and for the resummed splitting function. As in previous analyses, high-energy exponents are reduced to phenomenologically acceptable values. Additionally, interesting preasymptotic effects are observed. In particular, the splitting function shows a shallow dip in the moderate small-x region, followed by the expected power increase.

Keywords

RENORMALISATION GROUP
PERTURBATION THEORY
SPLITTING FUNCTION
QCD PERTURBATION
IMPROVED SMALL
EXTENDING QCD
PERTURBATIVE
SMALL X

All Related Versions

Version 1, 2003-05-22, ArXiv
Version 2, 2003-10-31, ArXiv
Version 1, 2003-10-09, ArXiv (Unconfirmed version)
Published version: Physics Letters B, 576 (1-2), 143.

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