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arXiv 1302.3952hep-ph
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极化比约肯求和规则分析:修订版

The polarized Bjorken sum rule analysis: revised

V. L. Khandramai, O. P. Solovtsova, O. V. Teryaev

摘要:

本文介绍了低动量转移下Bjorken求和规则的QCD分析进展。我们在分析Bjorken求和规则的精确数据和现有的系数函数$C_{Bj}(Q^2)$的四圈表达式的基础上,研究了低$Q^2$尺度下微扰QCD展开的渐近结构.我们证明,$C_{Bj}(Q^2)$的标准微扰系列给出了一个暗示,其渐近性质体现在$Q^2 \lesssim 1$ GeV $^2$区域。所考虑的微扰QCD修正的积分模型证实了这一点。我们提取了一个高扭曲$μ_4$系数的值,并研究了高阶和高扭曲贡献之间的相互作用。其他方法来描述Bjorken和规则数据的结果进行了讨论。

英文摘要:

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 $Q^2$ scales based on analysis of recent accurate data on the Bjorken sum rule and available now four-loop expression for the coefficient-function $C_{Bj}(Q^2)$. We demonstrate that the standard perturbative series for $C_{Bj}(Q^2)$ gives a hint to its asymptotic nature manifesting itself in the region $Q^2 \lesssim 1$ GeV$^2$. It is confirmed by the considered integral model for the perturbative QCD correction. We extract a value of higher-twist $μ_4$ 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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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