Abstract
The smallx behaviour of the non-singlet structure function is studied within the double logarithmic approximation (DLA) of perturbative QCD. Since there is neitherkT norθ 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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