Intercepts of the non-singlet structure functions Original Research Article

Infrared evolution equations for small-x behaviour of the non-singlet structure functions f1NS and g1NS are obtained and solved in the next-to-leading approximation, to all orders in αs, and including running αs effects. The intercepts of these structure functions, i.e., the exponents of the power-like small-x behaviour, are calculated. A detailed comparison with the leading logarithmic approximation (LLA) and DGLAP is made. We explain why the LLA predictions for the small-x dependence of the structure functions may be more reliable than the prediction for the Q2 dependence in the range of Q2 explored at HERA.