TY - JOUR
T1 - Extending QCD perturbation theory to higher energies
AU - Ciafaloni, M.
AU - Colferai, D.
AU - Salam, G. P.
AU - Staśto, A. M.
N1 - Funding Information:
This Letter was supported in part by the Polish Committee for Scientific Research (KBN) Grants Nos. 2P03B 05119, 5P03B 14420 and by MURST (Italy). We also wish to thank the referee for the careful reading of the text and useful suggestions.
PY - 2003/12/4
Y1 - 2003/12/4
N2 - 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.
AB - 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.
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U2 - 10.1016/j.physletb.2003.09.078
DO - 10.1016/j.physletb.2003.09.078
M3 - Article
AN - SCOPUS:1842703702
SN - 0370-2693
VL - 576
SP - 143
EP - 151
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1-2
ER -