Calibration and Tracking Subsystem for the QWEAK Experiment

QWEAK 实验的校准和跟踪子系统

• 批准号: 0245222
• 负责人: Mark Pitt
• 金额: --
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-01 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0245222&HistoricalAwards=false
• 关键词: Calibration; Tracking; Subsystem; QWEAK; Experiment

The research proposed here seeks the answer to one of the fundamentalquestions about our understanding of matter; i.e. is there any new physicsbeyond the Standard Model of electroweak physics. The QWEAK experiment atThomas Jefferson National Accelerator Facility addresses this question bymeasuring the proton's weak charge via parity-violating electron scatteringat very low momentum transfer. The proton's weak charge, which is itscoupling to the neutral Z boson, has a well-defined prediction in theStandard Model; and a precise measurement of this charge is sensitiveto many popular scenarios for extending the Standard Model. The Virginia Tech group is responsible for an essential component of theparticle tracking system, two sets of drift chambers. This system isrequired in order to precisely measure the kinematics of elasticallyelectrons, as well as for critical studies of experimental backgrounds.Participation by one graduate student and two undergraduate studentsunder the supervision of a faculty participant and funded by this grantwill provide essential resources for timely completion of this project,and will substantially enhance their educational experience and training.

这里提出的这项研究寻求关于我们对物质的理解的一个基本问题的答案，即除了电弱物理的标准模型之外，是否还有其他新的物理。托马斯·杰斐逊国家加速器设施的QWEAK实验解决了这个问题，它通过测量质子在极低动量转移下的违反宇称的电子散射来测量质子的弱电荷。质子的弱电荷，它与中性Z玻色子的耦合，在标准模型中有一个明确的预测；对这种电荷的精确测量对许多扩展标准模型的流行场景很敏感。弗吉尼亚理工大学负责粒子跟踪系统的一个重要组件，即两套漂移室。为了精确测量弹性电子的运动学，以及对实验背景的关键研究，这个系统是必需的。一名研究生和两名本科生在一名教师参与者的指导下参与，并由这笔赠款资助，这将为及时完成这一项目提供必要的资源，并将大大提高他们的教育经验和培训。