$D\bar{D}$相互作用在QCD中阈值附近很弱
$D\bar{D}$ interactions are weak near threshold in QCD
AI总结：
研究发现$D\bar{D}$在QCD阈值附近散射相互作用很弱，未发现束缚态或共振奇点。
摘要：
我们研究了在S波和D波下的近阈值$D\bar{D}$散射，以确定是否存在共振或束缚态。在禁用重子湮灭、具有两个退化轻夸克味和更重的奇异夸克的近似条件下，异旋是良好的量子数，而唯一其他开放的通道是$η_cη$。利用格点QCD，我们计算了随着轻夸克质量变化的耦合通道$η_cη-D\bar{D}$散射的S矩阵，并发现只有弱相互作用的介子对。与其它研究不同，我们在深度束缚的$χ_{c0}(1P)$态和$D_s\bar{D}_s$阈值之间的能量区域未发现任何束缚态或共振奇点的证据。
英文摘要：
We study near-threshold $D\bar{D}$ scattering in $S$ and $D$-wave to determine whether or not resonances or bound states are present. Working in the approximation where charm-annihilation is forbidden, with two degenerate light-quark flavors and a heavier strange quark, isospin is a good quantum number, and the only other channel that is kinematically open is $η_cη$. Using lattice QCD we compute, as a function of varying light-quark mass, the $S$-matrix for coupled-channel $η_cη- D\bar{D}$ scattering and find only weakly interacting meson pairs. In contrast to several other studies, we find no evidence for any bound-state or resonance singularity in the energy region between the deeply-bound $χ_{c0}(1P)$ state and the $D_s\bar{D}_s$ threshold.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
