The Parity Violating Electron Scattering Program of Louisiana Tech University

路易斯安那理工大学宇称破坏电子散射项目

• 批准号: 2111066
• 负责人: Rakitha Beminiwattha
• 金额: $ 43.49万
• 依托单位: Louisiana Tech University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2111066&HistoricalAwards=false
• 关键词: Parity; Violating; Electron; Scattering; Program

A central goal of subatomic physics is to gain a comprehensive understanding of the basic "building blocks" of matter, and how they interact with each other. Since its formulation nearly five decades ago, the “Standard Model” of nuclear and particle physics has been remarkably successful and allows us to describe a vast range of physical phenomena. It is known, however, to be incomplete, and there are compelling reasons why the Standard Model should eventually break down and fail to describe some properties of matter. Precision measurements using electron accelerators present an opportunity to test the Standard Model of particle physics and to search for new physics. The Thomas Jefferson National Accelerator Facility (Jefferson Lab) in Newport News, Virginia is currently the world's leading laboratory enabling precision tests of the Standard Model through electron scattering experiments. This project will support an effort to precisely determine the weak charge of the electron in a large collaborative experiment, known as MOLLER, at Jefferson Lab. The electroweak mixing angle is a fundamental parameter of the electroweak sector of the standard model of particle physics and a comparison of the measured value, at a particular energy scale, with the predicted value allows for a sensitive search for physics beyond the standard model. The Louisiana Tech University nuclear physics group will collaborate with other US and International groups to measure the weak mixing angle at low energy using parity-violating electron techniques at low momentum transfer; 4.5 x 10-3 GeV/c2 Q2 0.20 GeV/c2. The main goals of the LTU group’s work will be to design and develop charge particle detection systems for the MOLLER experiment, design an electron detector for a polarimeter, design radiation shielding measures for MOLLER, and develop a theoretical interpretation of the experimental results. In addition, the group will finish publishing the results from a prior experiment at Jefferson Lab: Q-weak. Louisiana Tech University is located in a rural area of Northern Louisiana. In recent years, all of the surrounding universities have eliminated their physics departments leaving the Louisiana Tech program as the only physics undergraduate or graduate program available in Northern Louisiana. The LTU commitment to the involvement of undergraduates in research is one of the reasons they have a physics undergraduate program. The NSF funding will enable underrepresented groups from several disciplines, engineers, science teachers, and high school students to participate in forefront physics research.This project is jointly funded by the Physics Division and the Established Program to Stimulate Competitive Research (EPSCoR).This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

亚原子物理学的一个中心目标是全面了解物质的基本“积木”，以及它们如何相互作用。自近50年前提出以来，核物理和粒子物理的“标准模型”取得了巨大的成功，使我们能够描述大量的物理现象。然而，众所周知，标准模型是不完整的，并且有令人信服的理由解释为什么标准模型最终会崩溃，无法描述物质的某些性质。 使用电子加速器的精确测量为检验粒子物理学的标准模型和寻找新的物理学提供了机会。 位于弗吉尼亚州纽波特纽斯的托马斯杰斐逊国家加速器设施（杰斐逊实验室）是目前世界领先的实验室，通过电子散射实验对标准模型进行精确测试。该项目将支持在杰斐逊实验室的一个大型合作实验中精确确定电子的弱电荷的努力，该实验被称为MOLLER。电弱混合角是粒子物理学标准模型的电弱部分的基本参数，并且在特定能量标度下的测量值与预测值的比较允许对超出标准模型的物理学的敏感搜索。路易斯安那理工大学核物理小组将与其他美国和国际小组合作，在低动量转移下使用宇称违反电子技术测量低能弱混合角; 4.5 x 10-3 GeV/c2 Q2 0.20 GeV/c2。LTU小组工作的主要目标是设计和开发MOLLER实验的带电粒子检测系统，设计旋光计的电子探测器，设计MOLLER的辐射屏蔽措施，并开发实验结果的理论解释。 此外，该小组将完成发表杰斐逊实验室先前实验的结果：Q-弱。路易斯安那理工大学位于路易斯安那州北方的一个农村地区。近年来，所有周围的大学都取消了物理系，使路易斯安那理工学院成为北方路易斯安那州唯一的物理本科或研究生课程。LTU对本科生参与研究的承诺是他们拥有物理本科课程的原因之一。NSF的资金将使来自多个学科的代表性不足的群体，工程师，科学教师，该项目由物理系和促进竞争性研究的既定计划（EPSCoR）共同资助。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响进行评估，被认为值得支持审查标准。

项目成果

Measurement of the beam-normal single-spin asymmetry for elastic electron scattering from C12 and Al27

• DOI: 10.1103/physrevc.104.014606
• 发表时间: 2021-03
• 期刊: Physical Review C
• 影响因子: 3.1
• 作者: QWeak Collaboration D. Androic;D. Armstrong;A. Asaturyan;K. Bartlett;R. Beminiwattha;J. Benesch;F. Benmokhtar;J. Birchall;R. Carlini;M. Christy;J. Cornejo;S. Dusa;M. Dalton;C. Davis;W. Deconinck;J. Dowd;J. Dunne;D. Dutta;W. Duvall;M. Elassar;W. Falk;J. Finn;T. Forest;C. Gal;D. Gaskell;M. Gericke;V. Gray;F. Guo;J. Hoskins;D. Jones;M. Kargiantoulakis;P. King;E. Korkmaz;S. Kowalski;J. Leacock;J. Leckey;A. Lee;J. Lee;L. Lee;S. Macewan;D. Mack;J. Magee;R. Mahurin;J. Mammei;J. Martin;M. McHugh;D. Meekins;K. Mesick;R. Michaels;A. Mkrtchyan;H. Mkrtchyan;A. Narayan;L. Ndukum;Nuruzzaman;V. Nelyubin;W. Oers;V. Owen;S. Page;J. Pan;K. Paschke;S. Phillips;M. Pitt;R. Radloff;J. Rajotte;W. Ramsay;J. Roche;B. Sawatzky;T. Ševa;M. Shabestari;R. Silwal;N. Simicevic;G. Smith;P. Solvignon;D. Spayde;A. Subedi;R. Subedi;V. Tadevosyan;W. Tobias;B. Waidyawansa;P. Wang;S. Wells;S. Wood;P. Zang;S. Zhamkochyan

Determination of the Al27 Neutron Distribution Radius from a Parity-Violating Electron Scattering Measurement

通过宇称破坏电子散射测量确定 Al27 中子分布半径

• DOI: 10.1103/physrevlett.128.132501
• 发表时间: 2022
• 期刊: Physical Review Letters
• 影响因子: 8.6
• 作者: Androić, D.;Armstrong, D. S.;Bartlett, K.;Beminiwattha, R. S.;Benesch, J.;Benmokhtar, F.;Birchall, J.;Carlini, R. D.;Cornejo, J. C.;Covrig Dusa, S.
• 通讯作者: Covrig Dusa, S.