Abstract
We present extended analysis of the polarized Bjorken sum rule using the four-loop expression for the coefficient function C Bj(αs) available now and the recent low Q 2-data from the Jefferson Lab and COMPASS experiments. We demonstrate that the perturbative series for the function C Bj gives a hint to its asymptotic nature manifesting itself in the region Q 2 ≲ 1 GeV2. It is confirmed by the considered integral model for the perturbative QCD correction. We analyze values of higher-twist terms extracted from the mentioned data and discuss the interplay between higher orders perturbative and higher-twist contributions. We extend our consideration to the Gross-Llewellyn Smith sum rule and investigate the relation between higher twist coefficients in these two sum rules.
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Talk at the 20th International Symposium on Spin Physics (SPIN2012), JINR, Dubna, Russia, September 17–22, 2012.
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Khandramai, V.L., Solovtsova, O.P. & Teryaev, O.V. QCD analysis of the Bjorken sum rule revisited. Phys. Part. Nuclei 45, 49–51 (2014). https://doi.org/10.1134/S106377961401047X
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DOI: https://doi.org/10.1134/S106377961401047X