Lattice QCD Studies of Baryon and Meson Excitations Using Spatially-extended Hadron and Multi-hadron Operators

使用空间扩展强子和多强子算子的重子和介子激发的晶格 QCD 研究

• 批准号: 0653315
• 负责人: Colin Morningstar
• 金额: $ 46.07万
• 依托单位: Carnegie-Mellon University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-07-01 至 2010-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0653315&HistoricalAwards=false
• 关键词: Lattice; QCD; Studies; Baryon; Meson

Quantum chromodynamics (QCD) is the currently accepted theory ofthe strong nuclear force which binds quarks and gluons together to formhadrons, such as the proton and neutron. Understanding hadron formationis a long standing problem in nuclear/particle physics. A major objectiveof this proposal is to use large-scale computer simulations with QCDformulated on a space-time lattice to carry out ab initio determinationsof the mass spectrum of hadrons expected from the QCD theory. The novelfeature of the proposed activities is the use of large sets of spatiallyextended hadron operators in order to study more-massive excited hadron states,not just the lightest states. These states are currently of great interest to experimentalists, exemplified by the Hall B N-star program and the GlueXexperimental program in the proposed Hall D at the Thomas Jefferson NationalAccelerator Facility, as well as the CLEO-c project at Cornell. Understandingthe physics of quark confinement within hadrons is also an important intellectual challenge; in fact, the Yang-Mills mass gap is one of the seven so-called Millenium Prize problems announced by the Clay Mathematics Institute of Cambridge, Massachusetts. The proposed research incorporates the participation of two graduate students, and possibly one or more undergraduate students, whose educations will be enhanced not onlyby involvement in scientific projects at the forefront of nuclear theory,but also with high-technology training in the use of state-of-the-artparallel computing resources. Students will be funded to participate ininternational conferences. The broader impacts of the proposed activitieswill be strengthened through articles in popular publications and by postingresults with simplified background information on publicly accessible web pages.

量子色动力学(QCD)是目前公认的强核力理论，它将夸克和胶子束缚在一起，形成强子，如质子和中子。理解强子的形成是核/粒子物理学中一个长期存在的问题。这一建议的一个主要目的是利用建立在时空格子上的QCD的大规模计算机模拟，对QCD理论所期望的强子质量谱进行从头算确定。所提出的活动的新特点是使用大量空间扩展的强子算符来研究更大质量的激发强子态，而不仅仅是最轻的态。这些状态目前引起了实验者的极大兴趣，例如托马斯·杰斐逊国家加速器设施拟议中的D厅的B厅N-STAR计划和GlueX实验计划，以及康奈尔大学的CLEO-c项目。理解强子内夸克禁闭的物理学也是一个重要的智力挑战；事实上，杨-米尔斯质量差距是马萨诸塞州剑桥市克莱数学研究所宣布的七个所谓的千禧年奖问题之一。拟议的研究包括两名研究生的参与，可能还有一名或多名本科生的参与，他们的教育不仅将通过参与核理论前沿的科学项目来加强，而且还将通过使用最先进的并行计算资源的高科技培训来加强。学生将获得参加国际会议的资助。将通过在受欢迎的出版物上发表文章和在公开网页上张贴带有简化背景信息的成果来加强拟议活动的更广泛影响。