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28 March 2024
 
  » arxiv » hep-ph/0305254

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Extending QCD perturbation theory to higher energies
M. Ciafaloni ; D. Colferai ; G.P. Salam ; A.M. Stasto ;
Date 22 May 2003
Journal Phys.Lett. B576 (2003) 143-151 DOI: 10.1016/j.physletb.2003.09.078
Subject hep-ph
AbstractOn 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.
Source arXiv, hep-ph/0305254
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