  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.

High Energy Physics - Phenomenology