RUI: Studies of Nucleon Structure Using Electromagnetic Probes at Jefferson Laboratory

杰斐逊实验室(JLab)实验的主要目标之一是阐明强子--质子、中子和介子--的基本结构。我们团队在实验室长期建立的实验计划--过去、现在和未来--体现了这一目标。我们的重点是实验，这些实验将进一步加深我们对非微扰区质子的夸克自旋结构的理解。此外，JLab的长期未来侧重于将该设施的最大电子能量升级到12GeV，CNU小组正在积极参与这一努力。例如，我们将继续努力将质子电磁形状因数比的测量扩展到JLab可能的最高动量传递，并调查核介质中该形状因数比可能的修改。这些实验将为现有的质子结构理论模型提供严峻的考验，并将有力地推动基于量子色动力学(QCD)的更先进模型的发展。此外，在JLab的B厅，我们参与了一项实验计划，通过测量介子和介子的半包含电产生来绘制核子的自旋结构图。与RUI项目的目标一致，本科生和硕士研究生的教育是该项目的核心组成部分。我们将继续在JLab从事软件开发工作；这是我们多年来一直参与的工作的延续。由于这些努力的性质，我们预计我们可以让计算机科学和计算机工程专业的学生以及我们的物理专业的学生参与进来。事实上，我们的项目将为我们的学生在编程、建模、分析技术和批判性判断方面提供出色的培训。最后，我们已经证明，我们在杰斐逊实验室的物理项目提供了一个令人兴奋的机会，让我们的本科生接触到核物理领域，我们的学生确实会继续在该领域进行研究生学习。

One of the primary goals of experiments at the Jefferson Laboratory (JLab) is to elucidate the underlying structure of hadrons - protons, neutrons, and mesons. Our group's long established program of experiments at the laboratory - past, present, and future - embody this goal. We focus on experiments which will further our understanding of the quark spin structure of the proton in the non-perturbative regime. Moreover, the longer term future of JLab is focused on an upgrade of the maximum electron energy of the facility to 12 GeV, and the CNU group is actively involved in this effort. For example, we will continue to lead the efforts to extend the measurement of the proton electromagnetic form factor ratio to the highest momentum transfers possible at JLab, and also investigate the possible modification of this form factor ratio within the nuclear medium. These experiments will provide severe tests of the available theoretical models of proton structure, and will serve as a strong impetus for the development of more advanced models based upon quantum chromodynamics (QCD). In addition, in Hall B at JLab, we are involved in a program of experiments to map out the spin structure of the nucleon through the measurements of the semi-inclusive electroproduction of pions and kaons. Consistent with the goals of the RUI program, education of undergraduates and masters-level graduate students is a central component of this project. We will continue to engage in software development efforts at JLab; this is a continuation of work that we have been involved in for many years. Due to the nature of these efforts, we anticipate that we can involve computer science and computer engineering students, as well as our physics students. Indeed, our projects will provide excellent training for our students in the areas of programming, modeling, analysis techniques, and in critical judgment. Finally, we have demonstrated that our physics program at Jefferson Lab provides an exciting opportunity to expose our undergraduates to the field of nuclear physics, and that our students do continue on to graduate study in the field.