Motivated by the first observation of the double-charm tetraquark $T_{cc}^{+}(3875)$ by the LHCb Collaboration, we investigate the nature of $T_{cc}^{+}$ as an isoscalar $D{D}^{*}$ hadronic molecule in a meson-exchange potential model incorporated by the coupled-channel effects and three-body unitarity. The $D^0{D}^0{\pi }^{+}$ invariant mass spectrum can be well-described and the $T_{cc}^{+}$ pole structure can be precisely extracted. Under the hypothesis that the interactions between the heavy flavor hadrons can be saturated by the light meson-exchange potentials, the near-threshold dynamics of $T_{cc}^{+}$ can shed light on the binding of its heavy-quark spin symmetry (HQSS) partner $D^{*}{D}^{*}$ ($I=0$) and on the nature of other heavy hadronic molecule candidates such as $X(3872)$ and $Z_c(3900)$ in the charmed-anticharmed systems. The latter states can be related to $T_{cc}^{+}$ in the meson-exchange potential model with limited assumptions based on the SU(3) flavor symmetry relations. The combined analysis, on the one hand, indicates the HQSS breaking effects among those HQSS partners, and on the other hand, highlights the role played by the short and long-distance dynamics for the near threshold $D^{(*)}{D}^{(*)}$ and $D^{(*)}{\overline{D}}^{(*)}+\mathrm{c}.\mathrm{c}.$ systems.

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介子交换模型中粲算重强子分子的耦合通道描述及其意义

受到双魅力四夸克的首次观察的启发${\mathrm{时间}}_{CC}^{+}（3875）$通过 LHCb 合作，我们研究了${\mathrm{时间}}_{CC}^{+}$作为等标量$D{D}^{*}$由耦合通道效应和三体幺正性合并的介子交换势模型中的强子分子。这$D^0{D}^0{\pi }^{+}$不变的质谱可以很好地描述，并且${\mathrm{时间}}_{CC}^{+}$可以精确地提取极结构。假设重味强子之间的相互作用可以被轻介子交换势饱和，则接近阈值的动力学${\mathrm{时间}}_{CC}^{+}$可以揭示其重夸克自旋对称（HQSS）伴侣的结合$D^{*}{D}^{*}$（$我=0$）以及其他重强子候选分子的性质，例如$X（3872）$和$Z_C（3900）$在魅惑-反魅惑系统中​​。后面的状态可以与${\mathrm{时间}}_{CC}^{+}$在基于 SU(3) 风味对称关系的有限假设的介子交换势模型中。综合分析一方面表明了这些 HQSS 合作伙伴之间的 HQSS 突破效应，另一方面突出了短距离和长距离动态对近阈值所起的作用$D^{（*）}{D}^{（*）}$和$D^{（*）}{\stackrel{￣}{D}}^{（*）}+\mathrm{C}。\mathrm{C}。$系统。