论文标题
接近阈值的分子状态是否与邻近的$ \ bar qq $状态混合在一起？
Do near-threshold molecular states mix with neighbouring $\bar QQ$ states?
论文作者
论文摘要
过去的二十年是由hardronic光谱的文艺复兴时期的标志，这是由于关于外来状态的巨大实验信息而引起的。此类状态的大多数与夸克模型的预测息息相关，并且非常接近强雄性阈值。显着的例子由光荣的$ x（3872）$ charmonium like状态和双重迷人的tetraquark $ t_ {cc}^+$，分别从$ d \ bar {d}^*$和$ dd^*$和$ dd^*$ open-Charm thresholds的群众不到1 meV。此特征的普遍性暗示了这种异国情调状态的一般模式。在这项工作中，我们讨论了由于紧凑型夸克状态与望子连续通道的紧密耦合而形成近阈值分子状态的可能的通用机制。紧凑型陈述，即从连续通道和形成的强烈辐射分子中生存的强耦合极限限制 - 如果意识到这种情况将为孤立的耐药分子提供理由，忽略了从周围紧凑的，紧凑的夸克 - 模型状态的可能影响。我们面对$ d_ {s1}（2460）$和$ d_ {s1}（2536）$的现象学，尽管这些状态仍然可以使用其他解释。
The last two decades are marked by a renaissance in hadronic spectroscopy caused by the arrival of vast experimental information on exotic states in the spectrum of charmonium and bottomonium. Most of such states have properties at odds with the predictions of the quark model and reside very close to strong hadronic thresholds. Prominent examples are provided by the glorious $X(3872)$ charmonium-like state and the doubly charmed tetraquark $T_{cc}^+$ with the masses within less than 1 MeV from the $D\bar{D}^*$ and $DD^*$ open-charm thresholds, respectively. The universality of this feature hints towards the existence of a general pattern for such exotic states. In this work we discuss a possible generic mechanism for the formation of near-threshold molecular states as a result of the strong coupling of compact quark states with a hadronic continuum channel. The compact states that survive the strong coupling limit decouple from the continuum channel and therefore also from the formed hadronic molecule - if realised this scenario would provide a justification to treat hadronic molecules isolated, ignoring the possible influence from surrounding, compact quark-model states. We confront the phenomenology of the $D_{s1}(2460)$ and $D_{s1}(2536)$ with this picture and find consistency, although other explanations remain possible for those states.
