2012, Vol.15, No.3, pp.283-291
We study the difference between the higher order analytic
perturbation theory (APT) and the standard perturbative
description when analysing recent Jefferson Lab (JLab) data on the
first moments of spin structure functions g1p,n at
0.05 < Q2 < 3 GeV2. It has been shown that the values of
higher twist parameters extracted from the data by
using the APT approach provides better convergence of the
higher-twist series than by common perturbative QCD. We obtain
good quantitative description of all the JLab data sets down to
Q 280 MeV.
Key words:
deep-inelastic scattering sum rules, higher twist coefficients,
analytic perturbation theory
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