Meson Physics at Arizona State University

亚利桑那州立大学介子物理学

• 批准号: 1306737
• 负责人: Barry Ritchie
• 金额: $ 48万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-01 至 2018-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1306737&HistoricalAwards=false
• 关键词: Meson; Physics; Arizona; State; University

Technical description:This award supports a program of research in experimental hadronic physics by the Arizona State University Meson Physics Group which will yield information crucial to achieving a better understanding of how hadrons are composed of quarks by providing a large data set detailing the excitation spectra of key two- and three-quark systems. In particular, the Meson Physics Group at Arizona State University will study the excitations of the nucleon, Cascade, and Omega baryons, as well as the excitations of gluonic flux tubes within mesons. The polarization data that the group will provide for the nucleon are essential for addressing one of the NSAC/OMB milestones for hadronic physics, and the ASU group is uniquely positioned to provide that data. The group is also participating in a conditionally approved experiment that will use the CLAS12 detector under construction at Jefferson Lab to produce and discover excited baryon states of the Cascade and Omega using quasi-real incident photons. The data to be obtained will further detail the excitations of three-quark systems and complements work being done by the group on excited nucleons. The Meson Physics Group at Arizona State University also will work with the GlueX detector, currently under construction in Hall D at Jefferson Lab, in order to search gluonic excitations within mesons of masses up to 2.5 GeV. The ASU group will assume primary responsibility for building a triplet polarimeter to directly measure the Hall D photon beam polarization. The results of these investigations will be broadly disseminated through conference presentations and refereed publications, and will be archived in public databases.Broader significance and importance:No comprehensive theoretical description of how the nucleus of the atom is built from quarks can be achieved without a solid knowledge of the excited states. The data obtained from Arizona State University Meson Physics Group will further inform and test theoretical models used to understand the structure of matter that is comprised of quarks. In addition to potential discoveries in, and advancement of, the understanding of nuclear physics, the work to be supported will provide instruction and mentoring in science and technology to undergraduate and graduate students, as well as to a postdoctoral research associate. The triplet polarimeter to be built will enhance the precision reached for experiments conducted in Hall D at JLab as well as those using the photon beam at Mainz, resulting in important improvements in the infrastructure of those laboratories.

技术描述：该奖项支持亚利桑那州立大学介子物理组的实验强子物理研究计划，该计划将通过提供详细描述夸克激发光谱的大型数据集，产生对于更好地理解强子如何由夸克组成的至关重要的信息。关键的二夸克和三夸克系统。特别是，亚利桑那州立大学的介子物理小组将研究核子、级联和欧米伽重子的激发，以及介子内胶子通量管的激发。该小组将为核子提供的极化数据对于实现 NSAC/OMB 强子物理学里程碑之一至关重要，而 ASU 小组在提供该数据方面拥有独特的优势。该小组还参与了一项有条件批准的实验，该实验将使用杰斐逊实验室正在建造的 CLAS12 探测器，利用准真实入射光子产生和发现 Cascade 和 Omega 的激发重子态。即将获得的数据将进一步详细说明三夸克系统的激发，并补充该小组在激发核子方面所做的工作。亚利桑那州立大学的介子物理小组也将与目前正在杰斐逊实验室 D 厅建造的 GlueX 探测器合作，以搜索质量高达 2.5 GeV 的介子内的胶子激发。 ASU 小组将主要负责建造三重态偏振计来直接测量 Hall D 光子束偏振。这些研究的结果将通过会议演讲和参考出版物广泛传播，并将存档在公共数据库中。更广泛的意义和重要性：如果没有固体，就无法对原子核如何由夸克构建进行全面的理论描述。激发态的知识。从亚利桑那州立大学介子物理小组获得的数据将进一步提供和测试用于理解夸克组成的物质结构的理论模型。除了对核物理理解的潜在发现和进步之外，所支持的工作还将为本科生和研究生以及博士后研究员提供科学和技术方面的指导和指导。即将建造的三重态旋光计将提高 JLab D 厅以及美因茨光子束实验所达到的精度，从而使这些实验室的基础设施得到重大改进。