Drell-Yan Scattering: SeaQuest and Beyond

该奖项支持的主要物理项目是研究核子和原子核的风味结构。作为SeaQuest合作项目的一部分，研究将在芝加哥附近的费米国家加速器实验室（Fermilab）进行。SeaQuest的程序重点是Drell/Yan生产的双介子对，以确定核子海中的轻反夸克风味分布，以及如何在原子核中修改轻反夸克风味分布。这一信息将为尚不能从第一性原理确定的部子分布拟合提供直接输入。一项较小的努力旨在测量量子色动力学的基本预测，以测试我们分析强相互作用中硬散射反应的概念，即Sivers函数的符号变化。此外，密歇根小组将领导低温目标的操作，作为SeaQuest实验硬件责任的一部分。芝加哥附近费米国家加速器实验室（Fermilab）的SeaQuest实验将更好地理解轻反夸克在核子和原子核中的分布，以及产生核子海洋的物理机制。费米实验室将投入一项规模较小但非常重要的工作，开发一个极化Drell-Yan项目，作为布鲁克海文国家实验室和杰斐逊实验室自旋物理项目的补充。该项目建立在该小组所获得的专业知识的基础上，是该小组过去几年工作的自然延伸。这使他们能够在费米实验室的Drell-Yan实验中发挥重要作用，并在未来引领费米实验室的两极分化Drell-Yan项目。本科生和研究生的教育和培训，以及针对公众的外展是这个研究计划的一个重要方面。

The main physics program supported by this award is directed at the study of flavor structure of nucleons and nuclei. Research will be carried out at the Fermi National Accelerator Laboratory (Fermilab) near Chicago as part of the SeaQuest collaboration. The program with SeaQuest is focused on Drell/Yan production of di-muon pairs to determine the light antiquark flavor distributions in the nucleon sea, and how the light antiquark flavor distributions are modified in nuclei. This information will provide direct input to the parton distribution fits that cannot yet be determined from first principles. A smaller effort is aimed to enable measurements of a fundamental prediction of Quantum Chromodynamics that tests our concepts for analyzing hard-scattering reactions in strong interactions, known as the sign change of the Sivers function. In addition, the Michigan group will lead the operation of the cryogenic targets as part of their hardware responsibility to the SeaQuest experiment.The SeaQuest experiment at the Fermi National Accelerator Laboratory (Fermilab) near Chicago will provide a better understanding of how light anti-quarks are distributed in nucleons and nuclei, and on the physical mechanism which generates the sea of the nucleon. A smaller, but very important effort will be spent on developing a polarized Drell-Yan program at Fermilab that is complementary to the spin physics programs at Brookhaven National Lab and Jefferson Lab. This program builds on the expertise the group has gained, and is a natural extension of the group's work over the past years. It allows them to play a major role in the Drell-Yan experiment at Fermilab now, and to lead the way towards a polarized Drell-Yan program at Fermilab in the future. Education and training of both, undergraduate and graduate students, as well as outreach aimed at the general public is an important aspect of this research program.