3D Structure of Hadrons from Electromagnetic Probes Beyond the Leading Order of QED

来自电磁探针的强子 3D 结构超出 QED 的主序

• 批准号: 2111063
• 负责人: Andrei Afanasev
• 金额: $ 27万
• 依托单位: George Washington 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=2111063&HistoricalAwards=false
• 关键词: 3D; Structure; Hadrons; Electromagnetic; Probes

Key questions being addressed in modern nuclear science include, among others, (i) the role of the quarks and gluons in forming nucleons (protons and neutrons) and nuclei and (ii) fundamental symmetries governing interactions between leptons (electrons and muons) and nucleons and nuclei. The US has made significant investments into fundamental science and provided facilities for nuclear research that are aimed toward finding answers to these questions. These facilities include CEBAF at the Thomas Jefferson National Accelerator Facility, which will investigate the structure of hadrons, the set of heavy elementary particles that includes the proton and neutron, and a future Electron-Ion Collider planned at Brookhaven National Laboratory. The electrons used to probe the nuclear structure are charged particles, and while scattering off nuclear targets they inevitably emit photons or exchange extra virtual photons, presenting a challenge in interpretation in terms of hadronic structure and dynamics. This project aims to develop a unified approach that will consider both high-order electromagnetic effects and the nucleon’s structure in a theoretical description of electron scattering processes. In addition, the PI will mentor students engaged in this research, provide public lectures, and organize meeting with students in local high schools in Washington, DC.This project will advance current understanding of electromagnetic interactions of hadrons beyond the leading order in QED by developing appropriate theoretical and modelling approaches. Novel effects will be considered for elastic electron-nucleon scattering, deep-virtual electroproduction of pions, semi-inclusive deep-inelastic scattering of leptons, along with new topological states of relativistic electrons. The results of the investigation will be discussed in relation to the physics programs at Jefferson Lab and future Electron-Ion Collider at Brookhaven National Lab that aim to map 3D-structure of hadrons from precision electron scattering. Results of the project will be disseminated through a user-friendly interface mirrored at Jefferson Lab (Radiative Corrections Helpdesk) to assist nuclear physics community in developing proper physics analysis tools. Novel solutions for polarization-dependent cross sections of lepton scattering will be implemented in GEANT4 toolkit through PI’s active membership in GEANT4 Collaboration.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.

现代核科学中的关键问题包括（i）夸克和麸质在形成核（质子和中子）和核的作用，以及（ii）基本的对称性，涉及舔（电子和穆斯群）以及核和核与核和核与核和核之间的相互作用。美国已经对基础科学进行了大量投资，并为核研究提供了旨在寻找这些问题答案的核研究设施。这些设施包括托马斯·杰斐逊国家加速器设施的Cebaf，该设施将研究Hadrons的结构，包括质子和中子在内的一组重型基本颗粒，以及计划在Brookhaven国家实验室计划的未来电子离子撞机。用于探测核结构的电子是充电的颗粒，在散射核靶标时，它们不可避免地会发出照片或交换额外的虚拟照片，从而在望发者结构和动力学方面提出了挑战。该项目旨在开发一种统一的方法，该方法将在电子散射过程的理论描述中考虑高阶电子效应和核的结构。此外，PI将指导从事这项研究的学生，提供公开讲座，并组织华盛顿特区当地高中的学生会议。该项目将通过开发适当的理论和建模方法来提高对Hadron的电子互动的最新理解。将考虑新的效果，用于弹性电子核子散射，乳酸的深文化电源，半含量的瘦散射以及相对论电子的新拓扑状态。调查结果将与Brookhaven国家实验室的Jefferson Lab和Future Electron-Ion Collider的物理计划有关，旨在从Precision电子散射中绘制Hadron的3D结构。该项目的结果将通过在杰斐逊实验室（Radiative Corrections heldsk）的用户友好界面进行传播，以帮助核物理社区开发适当的物理分析工具。 Lepton散射依赖两极分化的横截面的新颖解决方案将通过PI在Geant4协作中的积极成员资格在Geant4 Toolkit中实施。该奖项反映了NSF的法定任务，并通过使用基金会的知识分子优点和更广泛的影响审查标准来通过评估来诚实地支持。

项目成果

Two-Photon Exchange Effects in Semi-Inclusive Deep-Inelastic Scattering on a Nucleon

核子半包容深非弹性散射中的双光子交换效应

• 发表时间: 2021
• 期刊: APS
• 作者: A. Afanasev, Stinson Lee

Charge-asymmetric correlations in elastic lepton- and antilepton-proton scattering from real photon emission

真实光子发射的弹性轻子和反轻子-质子散射中的电荷不对称相关性

• DOI: 10.1140/epja/s10050-022-00805-8
• 发表时间: 2022
• 期刊: The European Physical Journal A
• 作者: Afanasev, A.;Ilyichev, A.
• 通讯作者: Ilyichev, A.

Vorticity of Twisted Spinor Fields

扭曲旋量场的涡度

• 发表时间: 2022
• 期刊: ArXivorg
• 作者: A. Afanasev, C.E. Carlson