Drell-Yan Scattering: SeaQuest and Beyond

Drell-Yan 散射：SeaQuest 及其他

• 批准号: 1204942
• 负责人: Wolfgang Lorenzon
• 金额: $ 42万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-06-15 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1204942&HistoricalAwards=false
• 关键词: Drell; Yan; Scattering; SeaQuest; Beyond

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.

该奖项支持的主要物理学项目是针对核子和原子核的味结构的研究。研究将在芝加哥附近的费米国家加速器实验室（Fermilab）进行，作为SeaQuest合作的一部分。该计划与SeaQuest的重点是Drell/Yan生产的双μ子对，以确定轻反夸克味分布在核子海中，以及轻反夸克味分布是如何修改的核。该信息将提供直接输入到尚不能从第一原理确定的部分子分布拟合。一个较小的努力是为了实现量子色动力学的基本预测的测量，测试我们的概念，用于分析强相互作用中的硬散射反应，称为Sivers函数的符号变化。此外，密歇根大学的研究小组将领导低温靶的操作，作为他们对SeaQuest实验的硬件责任的一部分。SeaQuest实验在芝加哥附近的费米国家加速器实验室（Fermi National Accelerator Laboratory）进行，将更好地了解轻反夸克如何在核子和原子核中分布，以及产生核子海的物理机制。一个较小的，但非常重要的努力将花在发展极化Drell-Yan程序在费米实验室，是补充在布鲁克海文国家实验室和杰斐逊实验室的自旋物理程序。该计划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。它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极化Drell-Yan计划。本科生和研究生的教育和培训，以及针对公众的推广是本研究计划的一个重要方面。