NRQCD Calculations of Heavy Quark Bound States: Focus on the Fine Structure

重夸克束缚态的 NRQCD 计算：关注精细结构

• 批准号: 0456758
• 负责人: Beth Thacker
• 金额: $ 3万
• 依托单位: Texas Tech University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-03-01 至 2009-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0456758&HistoricalAwards=false
• 关键词: NRQCD; Calculations; Heavy; Quark; Bound

In recent years great strides have been made in lattice quantum chromodynamics (LQCD) from tadpole improvement and improved discretizations1 to simulations that include up to three flavors of dynamical quarks. It is possible to use coarser lattices than previously thought, decreasing the cost of simulations by as much as a factor of 10. In addition to a decrease in the cost of simulations, the time required for lattice simulations has also significantly decreased, the simplest calculations can now be done on a personal computer. Most importantly, it is now possible to perform high precision LQCD calculations, often with errors on the order of 1% or less, that can be used to test QCD and to predict experimental results. The implications of these new techniques are of particular importance to heavy quark physics. This project focuses on precision LQCD calculations of experimentally measurable quantities and to extending to higher order in powers of v/c knowledge of the non-relativistic QCD (NRQCD) Lagrangian that can be used in other calculations. The project involves collaboration with members of the high precision quantum chromodynamics (HPQCD) and United Kingdom quantum chromodynamics (UKQCD) collaborations and will focus on NRQCD calculations of heavy quark bound states, in particular, on the fine structure of the Upsilon meson which is a bound state of a bottom quark and a bottom anti-quark

近年来，从t的改进和改进的离散化1到包括多达三种动态夸克风味的仿真，在晶格量子染色体动力学（LQCD）中取得了长足的进步。可以使用比以前想象的更粗糙的晶格，将模拟成本降低了多达10倍。除了降低模拟成本外，晶格模拟所需的时间也大大减少了，现在可以在个人计算机上完成最简单的计算。最重要的是，现在可以执行高精度LQCD计算，通常以1％或更少的阶段的误差进行，可用于测试QCD并预测实验结果。这些新技术的含义对于重夸克物理学尤其重要。该项目着重于实验可测量数量的精确LQCD计算，并扩展到可以在其他计算中使用的非相关QCD（NRQCD）Lagrangian的V/C知识的更高阶段。该项目涉及与高精度量子染色体动力学（HPQCD）和英国量子质量动力学（UKQCD）合作的合作，并将重点介绍重夸克绑定状态的NRQCD计算，尤其是在Upsilon Meson的良好结构上，这是下层Quark和下底Quark的界限状态