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A Measurement of the Transverse Asymmetry in Forward-Angle Electron-Carbon Scattering Using the Qweak Apparatus.

机译:使用Qweak装置测量前角电子碳散射中的横向不对称性。

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摘要

The Qweak experiment at Jefferson Lab aims to achieve a 4% measurement of the proton's weak charge by measuring the parity-violating asymmetry in elastic electron-proton scattering at low momentum-transfer squared, Q2= 0.025 (GeV/c)2. The measurement utilized Jefferson Lab's high-quality beam of 89% longitudinally polarized electrons at currents up to 180 muA. A measurement of this parity-violating asymmetry will result in a precise 0.3% measurement of sin2 thetaW. The Standard Model makes a firm prediction of this quantity, making the high-precision Qweak measurement sensitive to new physics at the TeV scale. The Qweak apparatus was also used to measure the transverse asymmetry of electron-carbon scattering. This quantity is an observable of the imaginary component of the two-photon exchange process. My contributions to these two projects included data taking, analysis work, quantifying background contributions, and GEANT4 simulations of the apparatus. As an additional part of my graduate training, I was part of the team that updated the CEBAF Injector MeV Mott Polarimeter.
机译:杰斐逊实验室的Qweak实验旨在通过在低动量传递平方Q2 = 0.025(GeV / c)2下测量弹性电子-质子散射中奇偶校验违反对称性来实现对质子弱电荷的4%测量。该测量使用了Jefferson Lab的高质量电子束,该电子束在电流高达180μA时具有89%的纵向极化电子。测量这种违反奇偶校验的不对称性将导致精确测量sin2 thetaW的0.3%。标准模型可对该量做出可靠的预测,从而使高精度Qweak测量对TeV尺度的新物理敏感。 Qweak仪器还用于测量电子碳散射的横向不对称性。该量是双光子交换过程的虚部的一个观测值。我对这两个项目的贡献包括数据采集,分析工作,量化背景贡献以及该设备的GEANT4模拟。作为我研究生训练的另一部分,我是更新CEBAF注射器MeV Mott旋光仪的团队的一员。

著录项

  • 作者

    McHugh, Martin James, III.;

  • 作者单位

    The George Washington University.;

  • 授予单位 The George Washington University.;
  • 学科 Quantum physics.;Nuclear physics and radiation.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 200 p.
  • 总页数 200
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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