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arXiv 2602.19504hep-phhep-exnucl-th
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由 $D^{(*)}$ 和两个核子组成的三体分子态

Three-body molecular states composed of $D^{(*)}$ and two nucleons

School of Physics, Sun Yat-sen University(中山大学物理学院);School of Physics, Southeast University(东南大学物理学院);Southern Center for Nuclear-Science Theory (SCNT), Institute of Modern Physics, Chinese Academy of Sciences(中国科学院近代物理研究所南方核科学理论中心)

Si-Yi Chen, Fei-Yu Chen, Xu-Liang Chen, Lu Meng, Ning Li, Wei Chen

AI总结:

在强子分子框架下,结合现实核子-核子相互作用和重夸克对称性约束的 $D^{(*)}N$ 势,研究 $DNN$ 和 $D^{*}NN$ 三体系统,发现 $DNN$ 在 $I(J^{P})=\tfrac{1}{2}(1^-)$ 通道存在紧致束缚态,$D^{*}NN$ 中自旋相关力导致清晰的能级层次,并形成紧凑的重味少体束缚态。

摘要:

我们在强子分子框架下研究 $DNN$ 和 $D^{*}NN$ 三体系统,将现实的核子-核子相互作用与由重夸克对称性约束的 $D^{(*)}N$ 势相结合。使用高斯展开法求解三体薛定谔方程,并通过复标度方法研究能谱的解析结构。我们发现,$DNN$ 系统在 $I(J^{P})=\tfrac{1}{2}(1^-)$ 通道中,在广泛的截断值范围内支持一个稳健且紧致的束缚态,即使相应的 $DN$ 子系统是弱束缚或非束缚的。对于 $D^{*}NN$,重介子的自旋-1 性质以及相关的自旋依赖力产生了一个清晰的自旋层次:在 $0^-$ 和 $2^-$ 通道中都出现了深束缚态,而 $1^-$ 通道则表现出特征性的双分支模式,包含一个强束缚的紧致分支和一个更弱束缚、空间扩展的分支。均方根半径表明,与氘核尺度相比,空间压缩显著,突出了现实 $NN$ 关联、$D^{(*)}N$ 相互作用和重夸克对称性在形成紧凑的重味少体束缚态中的协同作用。在所探索的参数空间中,没有发现复标度下的三体共振。我们的结果为未来寻找这类粲介子-核束缚态的实验提供了定量基准。

英文摘要:

We study the three-body systems $DNN$ and $D^{*}NN$ within a hadronic molecular framework by combining a realistic nucleon-nucleon interaction with a $D^{(*)}N$ potential constrained by heavy-quark symmetry. The three-body Schrödinger equation is solved with the Gaussian Expansion Method, and the analytic structure of the spectrum is investigated using the Complex Scaling Method. We find that the $DNN$ system supports a robust and compact bound state in the $I(J^{P})=\tfrac{1}{2}(1^-)$ channel over a broad range of cutoff values, even when the corresponding $DN$ subsystem is weakly bound or unbound. For $D^{*}NN$, the spin-$1$ nature of the heavy meson and the associated spin-dependent forces generate a clear spin hierarchy: deeply bound states appear in both $0^-$ and $2^-$ channels, while the $1^-$ channel exhibits a characteristic two-branch pattern with a strongly bound compact branch and a more weakly bound, spatially extended branch. The root-mean-square radii indicate pronounced spatial compression compared with the deuteron scale, highlighting the cooperative roles of realistic $NN$ correlations, the $D^{(*)}N$ interactions, and heavy-quark symmetry in forming compact heavy-flavor few-body bound states. No three-body resonances under complex scaling are found in the explored parameter space. Our results provide quantitative benchmarks for future experimental searches for such charmed-meson-nuclear bound states.

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