Experimental Studies of Nucleon Structure: Commissioning Jefferson Lab Halls A and C

现在一个公认的事实是，核子、质子和中子是由更基本的称为夸克的粒子组成的。虽然被称为量子色动力学(QCD)的理论已经被公认为描述了束缚核子中组成夸克和胶子的强相互作用，但关于夸克的空间和动量分布仍然存在许多问题。首席研究员和学生将在最近升级后在杰斐逊实验室进行的第一个实验中发挥主导作用，目标是测量核子中夸克的空间和动量分布，称为F_2结构函数。这些分布将与QCD理论启发下的核子模型的预测进行比较。除了科学重点之外，该研究计划还将解决培养下一代物理学家的迫切需要。作为历史上黑人学院或大学的一部分，汉普顿大学的物理学研究生课程广泛支持这一代表性不足群体的本科生和研究生的教育和培训。这个项目将继续为这些学生提供先进的、具有国际竞争力的科学培训。这项研究将研究从夸克渐近自由的动量转移区域到夸克被束缚到介子和重子的区域的过渡。这将通过在大动量转移下测量质子、中子和氘的质子磁形状因子、GMP和F_2结构函数的实验来实现，其精度比目前可用的要高得多。该项目还将支持为稍后运行的B厅实验所需的准备工作，该实验将测量在鲜为人知的大x区中的近自由中子的F2结构函数，该实验被杰斐逊实验室计划咨询委员会选为“高影响”称号。

It is now a well-established fact that nucleons, protons and neutrons, are made up of more elementary particles called quarks. While the theory known as Quantum Chromodynamics (QCD) has become accepted as describing the strong interaction, which binds the constituent quarks and gluons in the nucleon, numerous questions still remain about the quark spatial and momentum distributions. The principle investigator and students will take a leading role in the first experiment to take place at Jefferson Lab after the recent upgrade, with the goal of measuring the quark spatial and momentum distributions in the nucleon, called the F_2 structure function. These distributions will be compared with predictions from models of the nucleon inspired by QCD theory. In addition to the scientific focus the research program will address a critical need for training of the next generation of physicists. As part of an Historically Black College or University, the graduate physics program at Hampton University broadly supports the education and training of both undergraduate and graduate studentsfrom this under-represented group. This project will continue to provide access to advanced, internationally-competitive, scientific training for these students.This research will study the transition from the momentum transfer region in which the quarks are asymptotically free to the region in which the quarks are bound into mesons and baryons. This will be accomplished through experiments to measure the proton magnetic form factor, GMp , and the F_2 inclusive structure function of the proton, neutron, and deuteron at large momentum transfer with significantly better precision than currently available. The project will additionally support required preparations for a later-to-run Hall B experiment to measure the F_2 structure function of the nearly free neutron in the poorly understood large x regime, and which was chosen by the Jefferson Lab Program Advisory Committee for the "High Impact" designation.