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Revealing the structure of light pseudoscalar mesons at the electron–ion collider
Journal of Physics G: Nuclear and Particle Physics ( IF 3.5 ) Pub Date : 2021-05-25 , DOI: 10.1088/1361-6471/abf5c3
J Arrington 1 , C Ayerbe Gayoso 2 , P C Barry 3, 4 , V Berdnikov 5 , D Binosi 6 , L Chang 7 , M Diefenthaler 3 , M Ding 6 , R Ent 3 , T Frederico 8 , Y Furletova 3 , T J Hobbs 3, 9, 10 , T Horn 3, 5 , G M Huber 11 , S J D Kay 11 , C Keppel 3 , H-W Lin 12 , C Mezrag 13 , R Montgomery 14 , I L Pegg 5 , K Raya 7, 15 , P Reimer 16 , D G Richards 3 , C D Roberts 17, 18 , J Rodrguez-Quintero 19 , D Romanov 3 , G Salm 20 , N Sato 3 , J Segovia 21 , P Stepanov 5 , A S Tadepalli 3 , R L Trotta 5
Affiliation  

The questions of how the bulk of the Universe’s visible mass emerges and how it is manifest in the existence and properties of hadrons are profound, and probe the heart of strongly interacting matter. Paradoxically, the lightest pseudoscalar mesons appear to be key to a further understanding of the emergent mass and structure mechanisms. These mesons, namely, the pion and kaon, are the Nambu–Goldstone boson modes of quantum chromodynamics (QCD). Unravelling their partonic structure and the interplay between emergent and Higgs-boson mass mechanisms is a common goal of three interdependent approaches—continuum QCD phenomenology, lattice-regularised QCD, and the global analysis of parton distributions—linked to experimental measurements of hadron structure. Experimentally, the anticipated electron–ion collider will enable a revolution in our ability to study pion and kaon structures, accessed by scattering from the ‘meson cloud’ of the proton through the Sullivan process. With the goal of enabling a suite of measurements that can address these questions, we examine key reactions that identify the critical detector-system requirements needed to map tagged pion and kaon cross-sections over a wide range of kinematics. The excellent prospects for extracting pion structural, functional, and form-factor data are outlined, and similar prospects for kaon structures are discussed in the context of a worldwide programme. The successful completion of the programme outlined herein will deliver deep, far-reaching insights into the emergence of pions and kaons, their properties, and their role as QCD’s Goldstone boson modes.



中文翻译:

在电子-离子对撞机上揭示光赝标量介子的结构

宇宙的大部分可见质量如何出现以及它如何在强子的存在和性质中表现出来的问题是深刻的,并且探索了强相互作用物质的核心。矛盾的是,最轻的伪标量介子似乎是进一步理解涌现的质量和结构机制的关键。这些介子,即 pion 和 kaon,是量子色动力学 (QCD) 的 Nambu-Goldstone 玻色子模式。解开它们的部分结构以及涌现和希格斯玻色子质量机制之间的相互作用是三个相互依赖的方法的共同目标——连续 QCD 现象学、晶格正则化 QCD 和部分子分布的全局分析——与强子结构的实验测量相关。实验上,预期的电子离子对撞机将使我们研究 pion 和 kaon 结构的能力发生革命,通过沙利文过程从质子的“介子云”散射访问。为了实现一套可以解决这些问题的测量,我们检查了关键反应,这些反应确定了在广泛的运动学范围内绘制标记 pion 和 kaon 横截面所需的关键探测器系统要求。概述了提取 pion 结构、功能和形状因子数据的良好前景,并在全球计划的背景下讨论了 kaon 结构的类似前景。成功完成本文概述的计划将对介子和介子的出现、它们的性质以及它们作为 QCD 的戈德斯通玻色子模式的作用提供深刻而深远的见解。

更新日期:2021-05-25
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