标题： 未淬火三维格点QCD中的静态势和局域颜色场 显示英文标题

标题： Static Potential and Local Color Fields in Unquenched Three-Dimensional Lattice QCD

摘要： 在本项目中，通过测量重夸克和反夸克对在大距离处的静态势和局域色电场强度，展示了(2+1)-d格点QCD中动态夸克导致的弦断裂。 模拟是在具有两个味的阶梯夸克的非冻结SU(2)颜色情况下进行的。 使用了改进的胶子作用量，这使得在粗格点上进行模拟成为可能，从而提供了一种极其高效的方法来获取弦断裂发生的夸克分离和传播时间。 仅使用威尔逊环算符提取静态夸克势，因此试验态中没有价夸克。 结果提供了弦断裂的明确证据，因为在大距离处静态夸克势完全饱和于两倍重轻介子质量。 还表明，在大距离处夸克对之间的局域色电场强度趋于真空值。 讨论了这些结果对4-d QCD非冻结模拟的含义。 显示英文摘要

摘要： String breaking by dynamical quarks in (2+1)-d lattice QCD is demonstrated in this project, by measuring the static potential and the local color-electric field strength between a heavy quark and antiquark pair at large separations. Simulations are done for unquenched SU(2) color with two flavors of staggered quarks. An improved gluon action is used which allows simulations to be done on coarse lattices, providing an extremely efficient means to access the quark separations and propagation times at which string breaking occurs. The static quark potential is extracted using only Wilson loop operators and hence no valence quarks are present in the trial states. Results give unambiguous evidence for string breaking as the static quark potential completely saturates at twice the heavy-light meson mass at large separations. It is also shown that the local color-electric field strength between the quark pair tends toward vacuum values at large separations. Implications of these results for unquenched simulations of QCD in 4-d are drawn.