标题： 探索QCD中的S波阈值效应：一种重-轻方法 显示英文标题

标题： Exploring S-Wave Threshold Effects in QCD: A Heavy-Light Approach

摘要： QCD在S波两体阈值附近表现出复杂的动力学行为。 对于轻介子，我们看到夸克模型无法解释$f_0(500)$和$K_0^*(700)$的质量。 对于魅夸克偶素，在开放魅夸克阈值处出现了一个意外的$X(3872)$状态。 在重轻系统中，类似于阈值效应出现在$D_s$和$B_s$系统中的最低$J^P = 0^+$和$1^+$状态。 在这里，我们描述了如何通过在研究重轻系统时平滑地改变奇异夸克质量来使用格点QCD来理解这些阈值动力学。 使用围绕物理奇异夸克质量的小扰动，以始终保持在物理QCD动力学附近。 这个计算是对文献中已有计算的直接扩展，可以通过多个格点QCD合作组以最小的计算成本进行。 显示英文摘要

摘要： QCD exhibits complex dynamics near S-wave two-body thresholds. For light mesons, we see this in the failure of quark models to explain the $f_0(500)$ and $K_0^*(700)$ masses. For charmonium, an unexpected $X(3872)$ state appears at the open charm threshold. In heavy-light systems, analogous threshold effects appear for the lowest $J^P = 0^+$ and $1^+$ states in the $D_s$ and $B_s$ systems. Here we describe how lattice QCD can be used to understand these threshold dynamics by smoothly varying the strange-quark mass when studying the heavy-light systems. Small perturbations around the physical strange quark mass are used so to always remain near the physical QCD dynamics. This calculation is a straightforward extension of those already in the literature and can be undertaken by multiple lattice QCD collaborations with minimal computational cost.