Narrow Results

I review a new technique for calculation of higher twist evolution equations in Quantum Chromodynamics.

We apply analytic perturbation theory (APT) to the QCD analysis of the xF₃(x, Q²) structure function considering a combined set of deep inelastic scattering data presented by several collaborations, and extract values of the scale parameter Λ_QCD, the parameters of the form of the xF₃ structure function, and the x-shape of the higher twist (HT) contribution. We study the difference between the results obtained within the standard perturbative and analytic approaches in comparison with the experimental errors and state that the greatest difference occurs for large x.