Topics in Strong Force

坚强的力量专题

基本信息

批准号：
1713125
负责人：
Andrei Belitsky
金额：
$ 27万
依托单位：
Arizona State University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-09-01 至 2021-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1713125&HistoricalAwards=false
关键词：
Topics Strong Force

项目摘要

Understanding the internal structure of nucleons -- protons and neutrons, the building blocks of matter that is most familiar to us -- is one of the fundamental challenges in nuclear physics. This project will contribute new understanding to Quantum Chromodynamics (QCD), the theory describing the strong force between the quarks and gluons making up the nucleon. The PI will apply theoretical methods to build phenomenological models used to understand experimental data obtained at the Thomas Jefferson National Accelerator Facility (JLab) from experiments focused on measurements of nucleon properties. The recent 12 GeV upgrade at JLab will allow scientists to study the properties of QCD with an unprecedented level of precision. The educational component represents an important aspect of this project. The training and mentoring of graduate and undergraduate students will prepare junior researchers for future careers in industry or academia. The PI's outreach activities will increase public awareness of nuclear-particle physics through popular science presentations, as well as by mentoring and guidance of high school students.The two research areas of this project are related to the physics of the strong force and are based on phenomenological and theoretical approaches to the problem of quark confinement, broadly defined. The first thrust of the project is focused on understanding of higher twist/order corrections to processes sensitive to quasiprobability distributions, known as Generalized Parton Distributions (GPDs), and will be indispensable for proper analysis of experimental data. The PI and his students will develop a separation technique to disentangle GPDs from data by providing analytical formulas for azimuthal moments of differential cross sections of photon electroproduction cross sections. The second thrust is centered around maximally supersymmetric Yang-Mills theory, which took on the status of the harmonic oscillator of Yang-Mills theories and is central in attempts to solving QCD at strong coupling. Understanding gauge scattering amplitudes, which possess very similar perturbative expansions in the two theories, is the focus of the currently pursued analytical approach to gauge dynamics. A crucial step in establishing a formalism that allows one to address scattering amplitudes nonperturbatively is their dual description in terms of Wilson loops on null polygonal contours that are amenable to analytical techniques.

了解核子（质子和中子）的内部结构是我们最熟悉的物质组成部分，是核物理学的基本挑战之一。该项目将为量子色动力学（QCD）提供新的理解，该理论描述了构成核子的夸克和胶子之间的强力。 PI 将应用理论方法建立唯象模型，用于理解托马斯·杰斐逊国家加速器设施 (JLab) 从核子特性测量实验中获得的实验数据。 JLab 最近的 12 GeV 升级将使科学家能够以前所未有的精度研究 QCD 的特性。教育部分是该项目的一个重要方面。对研究生和本科生的培训和指导将为初级研究人员为未来在工业界或学术界的职业生涯做好准备。 PI 的推广活动将通过科普演讲以及对高中生的辅导和指导，提高公众对核粒子物理的认识。该项目的两个研究领域与强力物理相关，并基于广泛定义的夸克禁闭问题的现象学和理论方法。该项目的第一个重点是了解对准概率分布（称为广义帕顿分布（GPD））敏感的过程的更高扭曲/阶次校正，这对于正确分析实验数据是必不可少的。 PI 和他的学生将开发一种分离技术，通过提供光子电生产横截面微分横截面的方位角矩的解析公式，将 GPD 从数据中分离出来。第二个推力以最大超对称杨-米尔斯理论为中心，该理论承担了杨-米尔斯理论谐振子的地位，并且是解决强耦合 QCD 的尝试的核心。理解规范散射振幅在两种理论中具有非常相似的微扰展开，是当前追求规范动力学分析方法的重点。建立一种允许人们以非微扰方式解决散射振幅的形式的关键步骤是它们在零多边形轮廓上的威尔逊环的双重描述，这些轮廓适合分析技术。