标题： 轻赝标粒子的结果来自三味模拟 显示英文标题

标题： Results for light pseudoscalars from three-flavor simulations

摘要： 我们计算了在具有三种动态味的改进阶梯夸克的不完全消去QCD中赝标介子的质量和衰变常数。 将格点数据拟合到阶梯手征扰动理论的形式，并在外来夸克质量和格点间距上进行外推，我们得到：$f_\pi = 129.5 \pm 0.9 \pm 3.5$MeV，$f_K = 156.6 \pm 1.0 \pm 3.6$MeV，以及$f_K/f_\pi = 1.210(4)(13)$。 $f_K/f_\pi$的值表明$|V_{us}|=0.2219(26)$。 我们还得到了$m_u/m_d = 0.43(0)(1)(8)$，或者，如果对连续极限中的电磁效应有更多输入，得到$m_u/m_d = 0.41(0)(1)(4)$。 使用一环微扰质量重整化，我们在 MSbar 方案中确定$m_u$和$m_d$。 显示英文摘要

摘要： We compute pseudoscalar meson masses and decay constants in partially quenched QCD with three dynamical flavors of improved staggered quarks. Fitting the lattice data to staggered chiral perturbation theory forms and extrapolating in quark mass and lattice spacing, we find: $f_\pi = 129.5 \pm 0.9 \pm 3.5$ MeV, $f_K = 156.6 \pm 1.0 \pm 3.6$ MeV, and $f_K/f_\pi = 1.210(4)(13)$. The value for $f_K/f_\pi$ implies $|V_{us}|=0.2219(26)$. We also obtain $m_u/m_d = 0.43(0)(1)(8)$, or, with more input on electromagnetic effects from the continuum, $m_u/m_d = 0.41(0)(1)(4)$. Using the one-loop perturbative mass renormalization, we determine $m_u$ and $m_d$ in the MSbar scheme.