The Sum Rules for Structure Functions of Polarized e(μ)N Scattering: Theory vs. Experiment
Ioffe, B. L.
Original · EN
The determination of twist-4 corrections to the structure functions of polarized e(μ)N scattering by QCD sum rules is reviewed and critically analyzed. It is found that in the case of the Bjorken sum rule the twist-4 correction is small at Q² > 5 GeV². However, the accuracy of the today experimental data is insufficient to reliably determine αₛ from the Bjorken sum rule. For the singlet sum rule -- p+n -- the QCD sum rule gives only the order of magnitude of twist-4 correction. At low and intermediate Q² the model is presented which realizes a smooth connection of the Gerasimov-Drell-Hearn sum rules at Q² = 0 with the sum rules for Γₚ,ₙ(Q²) at high Q². The model is in a good agreement with the experiment.
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