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arXiv 2202.09696nucl-exhep-ph
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A=3核的SIDIS测量

SIDIS Measurement with A=3 Nuclei

Zhihong Ye, Dipangkar Dutta, Dave Gaskell, Or Hen, Dave Meekins, Dien Nguyen, Jennifer Rittenhouse West, Lawrence Weinstein

摘要:

我们介绍了一个新的实验努力,在杰斐逊实验室(JLab),以精确地测量半包容深非弹性散射(SIDIS)从$^2$ D,$^3$ He,和$^3$ H目标\cite{c12-21-004}带电π介子电生的比率。该有条件批准的实验(C12-21-004)旨在使用标准CLAS 12配置和为批准的准弹性实验(E12-20-005)开发的新靶系统在Hall-B中运行。在这个数据驱动的研究中,我们将测量截面作为($x$,$Q^2$,$z$,$P_T$)的函数,以允许提取非极化部分子分布函数(PDF),横向动量分布(TMD)和碎裂函数(FF)在A = 3核。利用SIDIS轻核在宽$x_B$范围内的π介子产额超比值,我们寻找EMC效应中味依赖性的证据,为我们研究核环境对价夸克的影响提供了新的见解. A = 3镜像核之间的双比可以提供大x处d/u比的直接测量,这是由于它们相似且易于理解的核校正。利用镜像核和大的运动学范围,以及CLAS 12的高精度,我们将能够保持对基础物理的灵敏度,但大大降低由于重核目标中的衰减和强子化而引起的核不确定性。

英文摘要:

We introduce a new experimental effort at Jefferson Lab (JLab) to precisely measure the ratios of charged pion electroproduction in Semi-Inclusive Deep Inelastic Scattering (SIDIS) from $^2$D, $^3$He, and $^3$H targets \cite{c12-21-004}. This conditionally approved experiment (C12-21-004) aims to run in Hall-B using the standard CLAS12 configuration and a new target system developed for the approved quasi-elastic experiment (E12-20-005). In this data-driven study, we will measure the cross-sections as a function of ($x$, $Q^2$, $z$, $P_T$) to allow the extraction of the unpolarized parton distribution functions (PDFs), transverse momentum distributions (TMDs) and fragmentation functions (FFs) in A = 3 nuclei. By using super-ratios of pion yields of SIDIS off light nuclei over a wide $x_B$ range, we search for evidence of a flavor dependence in the EMC effect, giving us new insights into the effect of the nuclear environment on valance quarks. Double-ratios between A = 3 mirror nuclei can provide a direct measurement of the d/u ratios at large x due to their similar and well-understood nuclear corrections. With the utilization of mirror nuclei and the large kinematic range, and high precision of CLAS12, we will be able to maintain the sensitivity to the underlying physics but dramatically decrease the nuclear uncertainties due to attenuation and hadronization in heavy nuclei targets.

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