NONLINEAR PHENOMENA IN COMPLEX SYSTEMS
An Interdisciplinary Journal

2013, Vol.16, No.1, pp.93-98


Polarized Bjorken Sum Rule Analysis: Revised
V.L. Khandramai, O.P. Solovtsova, and O.V. Teryaev

We present progress in the QCD analysis of the Bjorken sum rule at low momentum transfers. We study asymptotic structure of the perturbative QCD expansion at low scales based on analysis of recent accurate data on the Bjorken sum rule and available now four-loop expression for the coefficient-function CBj(Q²). We demonstrate that the standard perturbative series for CBj(Q²) gives a hint to its asymptotic nature manifesting itself in the region < 1GeV². It is confirmed by the considered integral model for the perturbative QCD correction. We extract a value of higher-twist μ4 coefficient and study the interplay between higher orders and higher-twist contributions. Results of other approaches to the description of Bjorken sum rule data are discussed.


Key words: perturbation theory, deep-inelastic scattering, QCD analysis, higher twists

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