Research in Strong-Interaction Theory

项目名称：强相互作用理论研究主要研究人员：R.J.Furnstahl，B.C.Clark，S.Jeschonnek，R.J.Perry提出了对涉及强相互作用系统的广泛问题的研究。提出的项目分为几大类，从直接涉及夸克和胶子自由度的研究，到低能强相互作用的有效理论，再到强相互作用实验的分析。智力优势：将通过日益复杂的夸克-强子二元性模型和通过改进的理论工具从符合电子散射数据分离核基态信息来研究轻核中的短程结构，来研究从强子自由度到夸克-胶子自由度的转变。这些项目与杰斐逊实验室的实验项目有着密切和直接的联系。其他项目重温了QCD和规则，该规则利用了夸克-强子二元性的另一个方面。在光前场理论计划中开发的重整化群工具在很大程度上被重定向到低能量有效场论。由低能量子色动力学(QCD)支配的核系统的有效理论正从两个方向发展。一方面，提出了扩展核子-核子、三体系统和多体系统的有效场论的基础性工作。与此同时，从另一方面来看，还有一些项目旨在改善对现实核系统的现象学描述，以减少模型依赖。这些努力是相辅相成的，都将影响核物理的前沿问题，如远离稳定性的原子核研究。重整化群方法在每个范畴中都扮演着重要的角色。模型独立性的目标自然与对物理学普遍方面的认识相结合，这反过来又加强了与其他学科的互动。目前正在努力开发对广泛的核反应和核结构(例如，全球光学势、核密度、介子-核散射、非弹性反应)的相对论描述，这将利用EFT输入。将对更多的原子核进行可靠的中子密度提取，并将光学势能扩展到更高的能量，并应用于宇称破坏的研究。更广泛的影响：本科生、研究生和博士后研究助理在开展拟议活动时接受的培训直接有助于建立一支多样化的科学队伍。我们的学生和博士后必须使用分析和数值计算的混合方法，这是为学术和工业研究做好准备的极好方法。由REU补助金资助的活动将积极让本科生参与研究；该小组中所有以前毕业的REU学生要么在工业或商业工作，要么进入专业或研究生院学习。该组织致力于科学的多样性，并成功地指导了几个代表性不足的团体的成员，其中包括四名获得教职的人。几个拟议的项目向布鲁克海文国家实验室的核数据中心提供数据。对社会的直接好处包括发展全球光学势能，用来估计对理解长期放射性废物储存很重要的横截面，以及计算核横截面，用来预测放射治疗患者的剂量学。

Title of Project: Research in Strong-Interaction Theory Principal Investigators: R. J. Furnstahl, B. C. Clark, S. Jeschonnek, R. J. Perry The study of a wide range of problems involving strongly interacting systems is proposed. The projects proposed fall into several broad categories, ranging from studies directly involving quark and gluon degrees of freedom, to effective theories of the strong interaction at low energies, to analyses of strong-interaction experiments. Intellectual merit: The transition from hadronic degrees of freedom to quark-gluon degrees of freedom will be studied though increasingly sophisticated models of quark-hadron duality and by investigating short-range structure in light nuclei through improved theoretical tools for disentangling the nuclear ground state information from coincidence electron scattering data. These projects have strong and direct ties to the experimental program at Jefferson Lab. Other projects revisit QCD sum rules, which exploit another facet of quark-hadron duality. The renormalization group tools developed in the light-front field theory program are largely redirected toward low-energy effective field theories. Effective theories of nuclear systems, which are governed by low-energy quantum chromodynamics (QCD), are being developed from two directions. From one side, fundamental work extending effective field theories (EFT) for nucleon-nucleon, three-body systems, and many-body systems is proposed. In parallel, from the other side, are projects to improve phenomenological descriptions of realistic nuclear systems to reduce model dependence. The efforts complement each other and both will impact forefront problems in nuclear physics, such as the study of nuclei far from stability. Renormalization group methods play important roles in each category. The goal of model independence is naturally coupled with the recognition of universal aspects of the physics, which in turn enhances interactions with other disciplines. Ongoing efforts to develop relativistic descriptions of a wide range of nuclear reactions and nuclear structure (e.g., global optical potential, nuclear densities, meson-nucleus scattering, inelastic reactions) will take advantage of EFT input. Reliable extractions of neutron densities will be made for more nuclei, and the optical potentials will be extended to higher energies and applied to studies of parity violation. Broader impacts: The training received by undergraduates, graduate students, and postdoctoral research associates in carrying out the proposed activities contributes directly to the building of a diverse scientific workforce. The mix of analytical and numerical computation our students and postdocs must employ is excellent preparation for both academic and industrial research. Activities funded by an REU supplement will actively involve undergraduates in research; all previous REU students in the group who have graduated are either working in industry, or business, or enrolled in professional or graduate school. The group is committed to diversity in science and has successfully mentored several members of under-represented groups, including four who have obtained faculty positions. Several proposed projects provide data to the Nuclear Data Center at Brookhaven National Laboratory. Direct benefits to society include the development of global optical potentials, which are being used to estimate cross sections that are important for understanding long-term radioactive waste storage, and calculations of nuclear cross sections, which are used in predicting dosimetry for patients in radiation therapy.