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arXiv 2203.14975hep-ph
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从CLAS数据中提取高扭曲部分子分布$e(x)$

Extraction of the higher-twist parton distribution $e(x)$ from CLAS data

Aurore Courtoy, Angel Miramontes, Harut Avakian, Marco Mirazita, Silvia Pisano

摘要:

本手稿介绍了旨在提取$e(x)$的最新CLAS和CLAS 12数据的新分析。本出版物受益于对\url{1405.7659}中以预印本形式发表的较小初步数据集的原理验证分析。我们提出了第一个逐点提取的扭转3 PDF。标量PDF,$e(x)$,通过分析在CLAS和CLAS 12的半包容DIS离质子靶中双强子产生的束自旋不对称性的$\sinϕ_R$ -矩的数据来访问。双强子形式主义允许使用共线框架,因此需要一组最小的近似和假设。提取的PDF $e(x)$包含了对大量未探索的夸克-胶子相关性物理学的见解,其第一梅林矩与核子的边缘已知标量电荷有关。我们表明,质子味组合的标量PDF是非零的概率大于$74\%$。

英文摘要:

This manuscript presents the new analysis of recent CLAS and CLAS12 data aimed at the extraction of $e(x)$. This publication benefits from a proof-of-principle analysis of a smaller preliminary data set published in a preprint form in \url{1405.7659}. We present the first point-by-point extraction of a twist-3 PDF. The scalar PDF, $e(x)$, is accessed through the analysis of the data for the $\sinϕ_R$-moment of the beam-spin asymmetry for dihadron production in semi-inclusive DIS off proton target at CLAS and CLAS12. The dihadron formalism allows for use of collinear framework, hence calling for a minimal set of approximations and hypotheses. The extracted PDF $e(x)$ carries insights into the physics of the largely-unexplored quark-gluon correlations, and its first Mellin moment is related to the marginally-known scalar charge of the nucleon. We show that the proton flavor combination of the scalar PDF is non-zero at more than $74\%$ probability.

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