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arXiv 2408.16552hep-ph
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AAK24:存在 $A_2$ 不对称性测量下的极化部分子分布全局 QCD 分析

AAK24: Global QCD analysis on polarized parton distribution in the presence of $A_2$ asymmetry measurements

Fatemeh Arbabifar, Shahin Atashbar Tehrani, Hamzeh Khanpour

AI总结:

本文提出 {\tt AAK24} 次领头阶 QCD 分析,通过结合极化 DIS 和 SIDIS 实验数据及 $A_2$ 不对称性测量,在考虑对称性破缺和靶质量修正下确定极化部分子分布。

摘要:

本文介绍了 {\tt AAK24},这是一项针对核子极化深度非弹性散射 (DIS) 和半单举深度非弹性散射 (SIDIS) 实验极化数据的次领头阶 (NLO) QCD 分析。{\tt AAK24} QCD 分析纳入了 SU(2) 和 SU(3) 对称性破缺,具体为 $δ\ar{u} \ eq δ\ar{d} \ eq δ\ar{s}$,同时假设 $δ\ar{s}$ 与 $δs$ 相等。强调半单举数据的重要性,本研究探讨了极化海夸克分布的确定。来自 {\tt JLAB17}、{\tt COMPASS16} 和 {\tt COMPASS17} 的最新实验数据,包括 $A_2$ 不对称性测量及 SIDIS 观测值,被彻底检验其对极化 PDF 中心值、不确定性和整体拟合质量的影响。此外,我们包含了非微扰靶质量修正 (TMC) 及高扭度项 (HT),这些尤为重要。本工作中,不确定性使用标准 Hessian 方法进行量化。{\tt AAK24} QCD 分析的主要结果与所分析的实验数据总体吻合良好,与其他极化 PDF 确定结果(特别是 {\tt DSSV14}、{\tt LSS10}、{\tt JAM17} 和 {\tt AKS14})一致,这些结果均考虑了 SU(2) 和 SU(3) 对称性破缺。

英文摘要:

This article introduces {\tt AAK24}, a Next-to-Leading Order (NLO) QCD analysis of polarized data from both polarized Deep Inelastic Scattering (DIS) and Semi-Inclusive Deep Inelastic Scattering (SIDIS) experiments on the nucleon. The {\tt AAK24} QCD analysis incorporates SU(2) and SU(3) symmetry breaking, specifically $δ\bar{u} \neq δ\bar{d} \neq δ\bar{s}$, while assuming $δ\bar{s}$ and $δs$ are equal. Emphasizing the significance of the semi-inclusive data, the study explores the determination of polarized sea quark distributions. Recent experimental data from {\tt JLAB17}, {\tt COMPASS16}, and {\tt COMPASS17}, including the $A_2$ asymmetry measurements along with SIDIS observables, are thoroughly examined for their impact on the central values of polarized PDFs, their uncertainties, and overall fit quality. Additionally, we include the nonperturbative target mass corrections (TMC) as well as higher-twist terms (HT) which are particularly important. In this work, the uncertainties are quantified using the standard Hessian method. The main results and findings of the {\tt AAK24} QCD analysis show overall good agreement with the analyzed experimental data, aligning well with other polarized PDF determinations, particularly {\tt DSSV14}, {\tt LSS10}, {\tt JAM17}, and {\tt AKS14}, all considering SU(2) and SU(3) symmetry breaking.

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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