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arXiv 2102.12771hep-ph
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非微扰对Bjorken求和规则贡献的新判定

A novel determination of non-perturbative contributions to Bjorken sum rule

Qing Yu, Xing-Gang Wu, Hua Zhou, Xu-Dong Huang

摘要:

在本文中,我们首先详细地研究了对BSR前导扭转部分的pQCD修正。以前的pQCD修正的领先扭曲的部分下得到的常规标度设置方法高达${\cal O}(α_s^4)$水平仍然表现出强烈的重整化标度依赖。最大保形性原理(PMC)通过利用重整化群方程确定过程的精确$α_s$运行行为,提供了一种消除常规重整化标度设置模糊性的系统方法。我们的计算证实了PMC预测满足标准的重整化群不变性,例如,它的固定阶预测模式和规模无关。在低$Q^2$区,过程的有效动量很小,为了有一个可靠的预测,我们采用了四个低能$α_s$模型进行分析。我们的预测表明,即使高扭曲项一般功率抑制在高$Q^2$区域,他们将有相当大的贡献,在低和中间$Q^2$域。通过与JLab数据的比较,我们利用更精确的与方案和尺度无关的pQCD预测,提出了一种新的非微扰高扭曲贡献的拟合。

英文摘要:

In the present paper, we first give a detailed study on the pQCD corrections to the leading-twist part of BSR. Previous pQCD corrections to the leading-twist part derived under conventional scale-setting approach up to ${\cal O}(α_s^4)$-level still show strong renormalization scale dependence. The principle of maximum conformality (PMC) provides a systematic way to eliminate conventional renormalization scale-setting ambiguity by determining the accurate $α_s$-running behavior of the process with the help of renormalization group equation. Our calculation confirms the PMC prediction satisfies the standard renormalization group invariance, e.g. its fixed-order prediction does scheme-and-scale independent. In low $Q^2$-region, the effective momentum of the process is small and to have a reliable prediction, we adopt four low-energy $α_s$ models to do the analysis. Our predictions show that even though the high-twist terms are generally power suppressed in high $Q^2$-region, they shall have sizable contributions in low and intermediate $Q^2$ domain. By using the more accurate scheme-and-scale independent pQCD prediction, we present a novel fit of the non-perturbative high-twist contributions by comparing with the JLab data.

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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