Qweak: Measurement of the Proton's Weak Charge

Qweak：质子弱电荷的测量

• 批准号: SAPPJ-2016-00033
• 负责人: Page, Shelley
• 金额: $ 5.06万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Subatomic Physics Envelope - Project
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=616848
• 关键词: Qweak; Measurement; Proton; Weak; Charge

A search for physics beyond the Standard Model of fundamental interactions has been underway at Jefferson Laboratory in Newport News, VA, for over a decade. The Qweak experiment has already produced the world’s first measurement of the proton’s weak charge, a fundamental property that determines how a proton responds to the weak interaction. Over the next two years we will complete our meticulous analysis of over 180 Terabytes of data acquired during 2010-12 and be ready to publish the most precise measurement of a parity-violating asymmetry in electron-proton scattering, determining the proton’s weak charge to 5x higher precision, and setting new limits on the possible existence of new force-mediating subatomic particles beyond the Standard Model. The Canadian group has been a major player in this bold initiative since it was first proposed in 2001. With support from NSERC, CFI, TRIUMF, Jefferson Lab, and our home institutions, we designed, built, tested and took responsibility for the installation, commissioning and successful implementation of the Qweak magnetic spectrometer, the main detector array, the Compton polarimeter recoil electron detectors, the quartz scanner detector, and all of the low-noise current mode electronics and digital readout for the main detector and beamline / polarized source diagnostic devices. We led the evaluation of helicity-correlated systematic errors in the experiment and played a major role in their assessment during the commissioning and running phases of Qweak. We have trained numerous undergraduate, graduate, and postgraduate researchers during the course of this intensive campaign. Our present grant request will support the group’s ongoing efforts, including one research associate who is an expert in Monte Carlo simulations and particle tracking analysis, to complete the final stages of the data analysis and prepare results for publication.

在弗吉尼亚州纽波特新闻的杰斐逊实验室已经进行了十多年的搜索。 QWEAK实验已经产生了世界上首次测量质子的弱电荷，这是一种基本属性，它决定了质子对弱相互作用的反应。在接下来的两年中，我们将完成对2010 - 12年期间收购的180多个数据的细致分析，并准备在电子质子散射中发表最精确的测量，以确定质子的弱电荷到5x上的较高精度，并确定质量较高的限制，并确定质子较高的限制，并确定了新的力量模型，而超过了新的强制性模型。 The Canadian group has been a major player in this bold initiative since it was first proposed in 2001. With support from NSERC, CFI, TRIUMF, Jefferson Lab, and our home institutions, we designed, built, tested and took responsibility for the installation, commissioning and successful implementation of the Qweak magnetic spectrometer, the main detector array, the Compton polarimeter recoil electronic detectors, the quartz scanner detector, and all of主要检测器和光束线 /极化源诊断设备的低噪声电流模式电子和数字读数。我们领导了对实验中螺旋性相关的系统错误的评估，并在QWEAK的调试和运行阶段的评估中发挥了重要作用。在这项密集的运动过程中，我们已经培训了许多本科，毕业生和研究生研究人员。我们目前的赠款请求将支持该集团正在进行的努力，其中包括一名研究助理，他是蒙特卡洛模拟和粒子跟踪分析的专家，以完成数据分析的最终阶段并准备出版结果。