NON-SINGLET STRUCTURE FUNCTIONS AT SMALL X

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 $k_T$ nor $θ$ ordering in the ladder Feynman graphs, the predicted non-singlet quark densities for the HERA kinematical range ($x\sim 10^{-3}$) 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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