Collaborative Reseach: Development of a Particle Tracking System for the Qweak Experiment

合作研究：Qweak 实验的粒子跟踪系统的开发

• 批准号: 0320832
• 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: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2009-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0320832&HistoricalAwards=false
• 关键词: Collaborative; Reseach; Development; Particle; Tracking

Virginia Polytechnic Institute and State University will design andbuild the `Region 2' tracking chambers for the Qweak experiment at Jefferson Lab. This experiment will make a high precision measurement at very low momentum transfer of the proton's weak charge, which is its coupling to the neutral Z boson. A high precision value of the weakmixing angle at low momentum transfer will be extracted, thus providinga sensitive test of the predicted energy scale dependence of this quantityin the electroweak standard model. A failure to observe this expectedbehavior could provide evidence for physics beyond the presently acceptedStandard Model. There are many candidate extensions to the Standard Modelthat would generate observable effects in this experiment. The Region 2 wire chambers are an essential component of the particletracking system, which is needed in order to precisely measure thekinematics of the elastically scattered electrons, as well as forcritical studies of experimental backgrounds. The chambers will consistof two sets of 50 cm x 50 cm horizontal drift chambers. Each drift chamber will have a total of 6 planes of wires. The expected resolutionwill be about 200 microns, providing an angular resolution of 1 mrad. The Region 2 drift chambers will provide quality educational experiencesfor both graduate and undergraduate students. The timescale of the project is well matched to the typical timescale of a graduate student's time in graduate school, so the student will get to participate in all hardware and software phases of the project. The tasks needed to complete the project include design and construction of the chambers, the front-end electronics, and the gas handling system, testing of the finished product, implementation in the Qweak experiment, and data analysis and trackingcode development when the experiment takes data. We expect to involvetwo graduate students and at least two undergraduate students in thiseffort, under the supervision of the faculty and senior research staffat Virginia Tech.

弗吉尼亚理工学院和州立大学将为杰斐逊实验室的QWEAK实验设计和建立“ 2区”跟踪室。 该实验将在质子弱电荷非常低的动量转移下进行高精度测量，这是其与中性Z玻色子的耦合。 将提取低动量转移时弱混合角的高精度值，从而为Electroweak标准模型提供了该量子的预测能量量表依赖性的敏感测试。 未能观察到这种预期的行为可能会为当前可接受的标准模型以外的物理提供证据。 标准模型有许多候选扩展，​​这将在本实验中产生可观察的效果。 区域2电线室是特定架子系统的重要组成部分，为了精确测量弹性散射电子的基础学以及实验背景的前瞻性研究所必需的。 腔室将由两组50 cm x 50 cm的水平漂移室组成。 每个漂移室将总共有6架电线。 预期的分辨率将约为200微米，提供1 MRAD的角度分辨率。 2区漂移室将为研究生和本科生提供高质量的教育经验。 该项目的时间表与研究生在研究生院的典型时间表非常匹配，因此该学生将可以参加该项目的所有硬件和软件阶段。 完成该项目所需的任务包括室的设计和构建，前端电子设备和气体处理系统，完成产品的测试，QWEAK实验中的实现以及实验获取数据时的数据分析和跟踪码的开发。 我们希望在教职员工和高级研究员弗吉尼亚理工大学的监督下，将与这一富裕的研究生和至少两名本科生有关。

项目成果

Precision measurement of the weak charge of the proton

• DOI: 10.1038/s41586-018-0096-0
• 发表时间: 2018-05
• 期刊: Nature
• 影响因子: 64.8
• 作者: D. Androić;D. Armstrong;A. Asaturyan;T. Averett;J. Balewski;K. Bartlett;J. Beaufait;R. Beminiwattha-R.-Bemin