Intermediate Energy Physics at Jefferson Lab and IUCF

杰斐逊实验室和 IUCF 的中间能量物理

• 批准号: 9901529
• 负责人: Steven Dytman
• 金额: $ 82.27万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-05-01 至 2003-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9901529&HistoricalAwards=false
• 关键词: Intermediate; Energy; Physics; Jefferson; Lab

9901529DytmanThe University of Pittsburgh Intermediate Energy group has twomajor projects underway. The first project is centered aroundthe CEBAF Large Acceptance Spectrometer (CLAS) at the JeffersonLab. We will use this newly commissioned detector for a widerange of studies of the basic components of matter- the proton and neutron. The microscopic structure of the proton has been studiedfor many years, but its richness has made a quantitative understanding difficult to obtain. Our basic goal is to learn as much as possible about the resonant intermediate states that are rearrangements of the quarks and gluons in the proton, i.e. the spectroscopy of the baryon states. The basic reaction has photon or electron beams impinging on a liquid hydrogen target. With CLAS, we can then examine essentially all of the many final states simultaneously. Our group will study final states that include eta and eta-prime particles because limited data to date have shown unusual and interesting behavior. The wide coverage will allow more complete theoretical studies of the quantum mechanical processes through which the final states develop. We also working on a phenomenological analysis program to extract the spectroscopic information. Our second project uses the Indiana University Cyclotron Facility (IUCF) Cooler Ring to produce pions in proton-proton collisions. Our previous experiments found a strong sensitivity to the way the pion couples to the proton, one of the fundamental features of the strong interaction in nuclei. The present experiments extend the study to spin variables at higher energy.

9901529 Dytman匹兹堡大学中间能源集团有两个主要项目正在进行中。 第一个项目是围绕在杰斐逊实验室的CEBAF大型接受光谱仪（CLAS）。 我们将使用这个新委托的探测器对物质的基本成分-质子和中子-进行广泛的研究。 质子的微观结构已经研究了很多年，但它的丰富性使得很难获得定量的理解。 我们的基本目标是尽可能多地了解质子中夸克和胶子重排的共振中间态，即重子态的光谱学。 基本反应是光子或电子束撞击液态氢靶。 有了CLAS，我们就可以基本上同时检查所有的最终状态。 我们的团队将研究包括eta和eta-prime粒子的末态，因为迄今为止有限的数据显示了不寻常和有趣的行为。 广泛的覆盖面将允许更完整的理论研究的量子力学过程中，通过最终状态的发展。 我们也在研究一个唯象分析程序来提取光谱信息。 我们的第二个项目使用印第安纳州大学回旋加速器设施（IUCF）冷却环在质子-质子碰撞中产生π介子。 我们以前的实验发现，π介子与质子的耦合方式具有很强的敏感性，这是核中强相互作用的基本特征之一。 目前的实验将研究扩展到更高能量的自旋变量。