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NON-SINGLET STRUCTURE FUNCTIONS AT SMALL X

B. I. Ermolaev, S. I. Manayenkov, M. G. Ryskin

hep-pharXiv:hep-ph/9502262

Abstract

The small x behaviour of the non-singlet structure function is studied within the double logarithmic approximation (DLA) of perturbative QCD. Since there is neither kT nor θ ordering in the ladder Feynman graphs, the predicted non-singlet quark densities for the HERA kinematical range (x 10-3) exceed the values calculated from the small-x approximation of the conventional Altarelli-Parisi evolution by a factor up to ten.

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