The Coherent BREMS Project: Baryon Resonance and Exotic Meson Search

相干 BREMS 项目：重子共振和奇异介子搜索

• 批准号: 0456830
• 负责人: Philip Cole
• 金额: $ 3万
• 依托单位: Idaho State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-07-01 至 2006-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0456830&HistoricalAwards=false
• 关键词: Coherent; BREMS; Project; Baryon; Resonance

We seek to build upon our earlier work and investigate the nature of resonant baryon states by probing protons with polarized photons. The set of experiments forming the first phase of the g8 run took place in the summer of 2001 (6/04/01 - 8/13/01) in Hall B of Jefferson Lab. These experiments made use of a beam of linearly-polarized photons produced through coherent bremsstrahlung and represent the first time such a probe has been employed at Jefferson Lab. The second phase of g8 will take place in the summer of 2005 (6/20/05 - 8/31/05). The scientific purpose of g8 is to improve the understanding of the underlying symmetry of the quark degrees of freedom in the nucleon, the nature of the parity exchange between the incident photon and the target nucleon, and the mechanism of associated strangeness production in electromagnetic reactions. With the high-quality beam of the tagged and collimated linearly-polarized photons and the nearly complete angular coverage of the Hall-B spectrometer, we seek to extract the differential cross sections and polarization observables for the photoproduction of vector mesons and kaons at photon energies ranging between 1.10 and 2.25 GeV. This proposed research has already yielded two PhD and two Master's theses, as well as one NSF Graduate Research Fellowship. A good part of the funding for this proposal will provide support for one PhD student.

我们试图建立在我们早期的工作和调查的性质共振重子态探测质子与偏振光子。2001年夏天（6/04/01 - 8/13/01）在杰斐逊实验室的B厅进行了一系列实验，形成了g8运行的第一阶段。这些实验利用了通过相干韧致辐射产生的线性偏振光子束，代表了杰斐逊实验室首次采用这种探测器。八国集团第二阶段会议将于2005年夏季（6/20/05 - 8/31/05）举行。g8的科学目的是提高对核子中夸克自由度的基本对称性、入射光子与靶核子之间宇称交换的性质以及电磁反应中相关奇异性产生机制的理解。随着高品质的光束的标记和准直线偏振光和几乎完整的角度覆盖的霍尔-B光谱仪，我们试图提取微分截面和偏振可观的光生矢量介子和K介子的光子能量范围在1.10和2.25 GeV之间。这项拟议的研究已经产生了两个博士和两个硕士论文，以及一个NSF研究生研究奖学金。这项提案的很大一部分资金将用于支持一名博士生。