Electromagnetic Probes of Hadronic Matter

强子物质电磁探测器

• 批准号: 1206082
• 负责人: Dustin McNulty
• 金额: $ 27万
• 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: 2012
• 资助国家: 美国
• 起止时间: 2012-08-01 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1206082&HistoricalAwards=false
• 关键词: Electromagnetic; Probes; Hadronic; Matter

This NSF award supports our continuing research program at Jefferson Lab using electromagnetic probes to study hadronic matter at the fundamental level. Our group focuses on four experimental efforts that test the basic nature of particle interactions at the quark gluon level. Five particle tracking drift chambers are currently being constructed at ISU to support Jefferson Lab's Hall B 12 GeV program. One of our experiments extracts polarization observables from meson photoproduction with linearly-polarized photons on the proton and deuteron and will result in two ISU PhD theses during this funding period. Another experiment will investigate quark distributions at extreme kinematics where the quarks carry most of the nucleon's momentum. A high-precision measurement of the pion lifetime is being undertaken in Jefferson Lab's Hall B. This experimental effort seeks to probe the mechanism through which a neutral charged pion can decay into two photons to stringently test confinement-scale quantum chromodynamics. Another high-precision experiment in Hall A, MOLLER, uses the parity-violating property of the weak interaction to measure a fundamental parameter of the Standard Model known as the Weinberg (or mixing) angle to within a relative uncertainty of 0.1%. When combined with other experiments, this measurement will place strong constraints on proposed extensions to our present version of the Standard Model. These research programs at JLab, the accelerator facilities at ISU, and continuous detector construction projects in the group's Laboratory for Detector Science, combine in an active program to provide a breadth of experiences for four graduate students and to train the next generation of scientists.

这个NSF奖项支持我们在杰斐逊实验室使用电磁探针在基础水平上研究强子物质的持续研究计划。 我们的小组专注于四个实验的努力，测试粒子相互作用的基本性质，在夸克胶子水平。 五个粒子跟踪漂移室目前正在建设中的国际空间大学，以支持杰斐逊实验室的霍尔B 12 GeV计划。 我们的一个实验提取极化观测介子光生与线性偏振光子的质子和氘，并将导致两个ISU博士论文在此资助期间。 另一个实验将研究夸克在极端运动学下的分布，在极端运动学下，夸克携带了核子的大部分动量。 在杰斐逊实验室的B厅正在进行一项高精度的π介子寿命测量。 这个实验试图探索一个中性带电π介子衰变为两个光子的机制，以严格测试限制尺度的量子色动力学。 另一个高精度实验在A厅，MOLLER，使用弱相互作用的宇称破坏特性来测量标准模型的基本参数，称为温伯格（或混合）角，相对不确定度为0.1%。 当与其他实验相结合时，这种测量将对我们目前版本的标准模型的拟议扩展施加强有力的约束。 JLab的这些研究项目，ISU的加速器设施，以及该集团探测器科学实验室的连续探测器建设项目，联合收割机结合在一个积极的计划中，为四名研究生提供广泛的经验，并培养下一代科学家。