标题： 从NRQCD/D234作用下的半轻子B衰变 显示英文标题

标题： Semileptonic B Decays from an NRQCD/D234 Action

摘要： 单轻子B → πℓν̄衰变在淬火各向异性晶格上被研究，使用树级梯形改善Symanzik胶子、NRQCD重夸克和D234轻夸克作用。 约束拟合方法被应用于提取两点和三点关联函数的基态贡献。 我们同意之前晶格对形式因子的测定结果。 正如之前的工作一样，这里的主要系统误差来源同样来自到物理pion质量的手征外推。 未来的计算必须在更轻的夸克质量下进行以解决这个问题。 显示英文摘要

摘要： Semileptonic, B --> pi, l nubar, decays are studied on quenched anisotropic lattices using tree-level tadpole improved Symanzik glue, NRQCD heavy quark and D234 light quark actions. Constrained fitting methods are applied to extract groundstate contributions to two-point and three-point correlators. We agree with previous lattice determinations of the form factors. The major source of systematic error here, as in previous work, comes from the chiral extrapolation to the physical pion mass. Future calculations must work at lighter quark masses to resolve this.