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

杰斐逊实验室（JLab）的主要实验目标之一是阐明强子的基本结构——质子、中子和介子。我们小组长期建立的实验室实验计划——过去、现在和未来——体现了这一目标。我们的重点是实验，这将进一步我们的理解质子的夸克自旋结构在非摄动状态。此外，JLab的长期未来重点是将该设施的最大电子能量提升到12 GeV， CNU小组正在积极参与这项工作。例如，我们将继续领导JLab将质子电磁形状因子比的测量扩展到可能的最高动量转移，并研究核介质中该形状因子比的可能修改。这些实验将为现有的质子结构理论模型提供严格的检验，并将为基于量子色动力学（QCD）的更先进模型的发展提供强大的推动力。此外，在JLab的B厅，我们参与了一个实验项目，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。与RUI项目的目标一致，本科生和硕士研究生的教育是这个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从事的工作的延续。由于这些努力的性质，我们预计我们可以包括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。事实上，我们的项目将在编程、建模、分析技术和批判性判断方面为我们的学生提供优秀的培训。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.