近二十年来，世界上众多高能物理实验发现了大量超出传统夸克模型的共振结构。为了理解 这些性质奇特的共振结构，科学家们提出了很多方法和模型。其中，因为实验上发现的这些奇特态 大多处在一对强子阈值附近，强子分子态的观点得到了很多关注。本文我们将以粲{反粲强子对为例 来探究哪些系统可以形成分子态，进而给出粲{反粲强子分子态的能谱。我们考虑了所有由 S 波粲 介子、粲重子以及窄的 P 波粲介子构成的粲{反粲强子对。我们假定它们之间的相互作用由介子交 换主导，在最低阶近似下可简化为常数。通过求解常数相互作用的 Bethe---Salpeter 方程，我们可以 找到振幅的极点进而确定该系统分子态的质量。最终我们发现，那些通过轻矢量介子交换在阈值附 近产生吸引力的系统，会存在一个靠近阈值的极点。不同的系统，由于其相互作用强度不同，极点 可能会处于能量复平面的第一黎曼面或者第二黎曼面，分别对应于束缚态或者虚态。我们总共发现 了 229 个强子分子态。很多实验上发现的那些位于粲---反粲强子对阈值附近的共振结构可以很好地 与我们的结果吻合。另外，我们需要强调所预言的一个 ΛcΛc  分子态，这个态可以很好地解释北京正负电子谱仪 (BESIII) 上测量的数据。

Many efforts have been made to reveal the nature of the overabundant resonant structures observed by the worldwide experiments in the last two decades. Hadronic molecules attract special attention because many of these seemingly unconventional resonances are located close to the threshold of a pair of hadrons. To give an overall feature of the spectrum of hadronic molecules composed of a pair of heavy-antiheavy hadrons, namely, which pairs are possible to form molecular states, we take charmed hadrons for example to investigate the interaction between them and search for poles by solving the Bethe-Salpeter equation. We consider all possible combinations of hadron pairs of the S-wave singly-charmed mesons and baryons as well as the narrow P-wave charmed mesons. The interactions, which are assumed to be meson-exchange saturated, are described by constant contact terms which are resummed to generate poles. It turns out that if a system is attractive near threshold by the light meson exchange, there is a pole close to threshold corresponding to a bound state or a virtual state, depending on the strength of interaction and the cutoff. In total, 229 molecular states are predicted. The observed near-threshold structures with hidden-charm, like the famous X(3872) and Pc states, fit into the spectrum we obtain. We also highlight a  ΛcΛc  bound state that has a pole consistent with the cross section of the e⁺e^-→ ΛcΛc  precisely measured by the BESIII Collaboration.