Coupled-Channel Analysis of Hidden-Charm Exotic States with $P$-Wave Charmonium and Molecular Components

Exotic hadrons, especially hidden-charm tetraquark candidates, have attracted significant attention in recent years. In this work, we perform a coupled-channel analysis of the $X(3860)$, $X(3872)$, and $Z(3930)$, where the physical states are described as superpositions of bare $P$-wave charmonium ($\chi_{cJ}(2P)$) and hadronic molecular components such as $D^{(*)}\bar{D}^{(*)}$ and $D_s^+ D_s^-$. The hadron–hadron interactions are modeled by one-boson exchange potentials, and the coupled Schrödinger equations are solved using the Gaussian expansion method. Our results show that the observed spectrum of these hidden-charm states can be consistently explained within this framework, suggesting that both compact $c\bar{c}$ cores and molecular degrees of freedom play essential roles in their structure.

2025年 11月 25日 — 2025年 11月 26日