Research in Theoretical Hadronic Physics and Related Topics

理论强子物理及相关课题研究

• 批准号: 0855618
• 负责人: Carl Carlson
• 金额: $ 28.5万
• 依托单位: College of William and Mary
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0855618&HistoricalAwards=false
• 关键词: Research; Theoretical; Hadronic; Physics; Related

An overall description of the research in this project is the study of proton structure (or more generally, of the structure of particles that feels the nuclear force, collectively known as hadrons). We want to learn the details of how the proton is put together, or how matter is distributed within a proton, and also to make use of this knowledge in the related fields, such as atomic physics, to calculate phenomena that are sensitive to the proton size. One remarkable method we use is a mathematical equivalence between results obtained in certain weakly coupled, hence relatively easily calculable, 5-dimensional theories and results in the 4-dimensional (counting time) theories that describe our world. We obtain results this way for the charge distribution, magnetization distribution, and energy distribution inside the proton and other particles. We have also been able to apply our knowledge of proton structure to make calculation of splittings between certain hydrogen energy levels to the remarkable accuracy of a part in a million.The direct impact of this research is to further our understanding of forefront hadronic physics. Broader impacts of the proposed activity include the training of new students, including undergraduates; bridging the gaps between different fields of physics such as between atomic and nuclear physics; and, given that the principal investigator is regularly at the Jefferson Laboratory, bridging the gap between university and national lab research groups. The principle investigator, it may be also noted, has had two successful women Ph. D. students and there may be further opportunities along these lines.

对该项目研究的总体描述是对质子结构的研究（或者更一般地说，对感受核力的粒子结构的研究，统称为强子）。 我们想了解质子如何组合在一起的细节，或者物质如何在质子中分布，并利用相关领域的知识，例如原子物理学，来计算对质子大小敏感的现象。 一个显着的方法，我们使用的是在某些弱耦合，因此相对容易计算，5维理论和结果在4维（计数时间）的理论，描述我们的世界所获得的结果之间的数学等价。 我们用这种方法得到了质子和其他粒子内部的电荷分布、磁化分布和能量分布。 我们还利用质子结构的知识计算了氢原子的能级分裂，精确度达到百万分之一，这一研究的直接影响是加深了我们对前沿强子物理的理解。 拟议活动的更广泛影响包括培训新生，包括本科生;弥合不同物理学领域之间的差距，如原子物理学和核物理学之间的差距;鉴于首席研究员定期在杰斐逊实验室，弥合大学和国家实验室研究小组之间的差距。我们还可以注意到，这位首席研究员有两个成功的女博士。学生和可能有进一步的机会沿着这些路线。