Calibration and Tracking Subsystem for the QWEAK Experiment

这里提出的研究寻求我们对物质理解的一个基本问题的答案;即，除了电弱物理学的标准模型之外，是否存在任何新的物理学。 托马斯·杰斐逊国家加速器实验室的QWEAK实验通过测量质子的弱电荷来解决这个问题，该实验是在非常低的动量转移下通过违反宇称的电子散射进行的。 质子的弱电荷，也就是它与中性Z玻色子的耦合，在标准模型中有一个明确的预测;而对这种电荷的精确测量对许多流行的扩展标准模型的方案是敏感的。弗吉尼亚理工大学的研究小组负责粒子跟踪系统的一个重要组成部分，两套漂移室。 该系统是必需的，以精确测量的elasticallyelectron的运动学，以及实验背景的批判性研究。参与由一名研究生和两名本科生under教师参与者的监督和本granitarian资助提供必要的资源，及时完成这一项目，并将大大提高他们的教育经验和培训。

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.