Research in Strong-Interaction Theory

项目名称：强相互作用理论研究 主要研究者：R. J. Reynstahl，B. C.克拉克，S。耶申内克河佩里的研究范围广泛的问题，涉及强相互作用系统的建议。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。智力优点：从强子自由度到夸克-胶子自由度的过渡将通过日益复杂的夸克-强子二象性模型进行研究，并通过改进的理论工具研究轻核中的短程结构，以便从符合电子散射数据中解开核基态信息。这些项目与杰斐逊实验室的实验项目有着密切而直接的联系。其他项目重新审视QCD求和规则，它利用了夸克-强子对偶性的另一个方面。在光锋场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有效场论。由低能量子色动力学（QCD）控制的核系统的有效理论正从两个方向发展。一方面，提出了将有效场论推广到核子-核子、三体和多体系统的基础性工作。与此同时，从另一方面，是项目，以改善现实的核系统的唯象描述，以减少模型的依赖性。这些努力相辅相成，都将影响核物理学的前沿问题，例如对远离稳定性的原子核的研究。重正化群方法在每一类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，这反过来又增强了与其他学科的互动。正在努力发展对各种核反应和核结构的相对论描述（例如，全局光学势、核密度、介子-核散射、非弹性反应）将利用EFT输入。对于更多的核，将可靠地提取中子密度，光学势将扩展到更高的能量，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人员在开展拟议活动时接受的培训直接有助于建设一支多样化的科学工作队伍。我们的学生和博士后必须采用的分析和数值计算的混合是学术和工业研究的良好准备。由REU补充资助的活动将积极参与研究本科生;所有以前的REU学生在谁已经毕业的组要么在工业，或商业工作，或就读于专业或研究生院。该小组致力于科学的多样性，并已成功地指导了几个代表性不足的群体，包括四个谁获得了教师职位的成员。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。对社会的直接惠益包括：开发全球光学势，用于估计对了解放射性废物长期储存很重要的截面;计算核截面，用于预测放射治疗患者的剂量。

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.