标题： 使用非相对论格点QCD计算重轻衰变常数 显示英文标题

标题： Computation of the Heavy-Light Decay Constant using Non-relativistic Lattice QCD

摘要： 我们报道了在重夸克采用非相对论QCD方法、轻夸克采用Wilson作用量的情况下，关于重味–轻夸克介子衰变常数格点计算的结果。模拟是在$\beta=6.0$上一个$16^3\times 48$格点大小的网格上进行的。 相比于静态近似下的模拟，基态的信噪比得到了显著改善，使我们可以可靠地提取衰变常数。我们计算了几种重夸克质量情况下的重味–轻夸克衰变常数，并估计了偏离重质量标度律$f_{P} \sqrt{m_{P}} = const$的程度。 对于$B$介子，我们得到的结果为$f_{B} = 171\pm 22^{+19}_{-45}$MeV；而外推到静态极限时，则得到$f_{B}^{static}$=$297\pm 36^{+15}_{-30}$MeV。 显示英文摘要

摘要： We report results on a lattice calculation of the heavy-light meson decay constant employing the non-relativistic QCD approach for heavy quark and Wilson action for light quark. Simulations are carried out at $\beta=6.0$ on a $16^3\times 48$ lattice. Signal to noise ratio for the ground state is significantly improved compared to simulations in the static approximation, enabling us to extract the decay constant reliably. We compute the heavy-light decay constant for several values of heavy quark mass and estimate the magnitude of the deviation from the heavy mass scaling law $f_{P} \sqrt{m_{P}} = const$. For the $B$ meson we find $f_{B} = 171\pm 22^{+19}_{-45}$ MeV, while an extrapolation to the static limit yields $f_{B}^{static}$ = $297\pm 36^{+15}_{-30}$ MeV.