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arXiv · 2507.21672

Hadronic Molecules and $\chi_{cJ}(2P)$ Coupled States

Kotaro Miyake·Yasuhiro Yamaguchi
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Abstract

We investigate hidden-charm exotic mesons based on a coupled-channel framework, where the physical states are described as superpositions of a compact $c\bar c$ core (identified with the $\chi_{cJ}(2P)$ states) and hadronic components such as $D^{(*)}\bar D^{(*)}$. We incorporate meson exchange potentials to describe hadron-hadron interactions and determine model parameters to reproduce the observed masses of $X(3872)$ and $Z(3930)$. The model also predicts a $0^{++}$ bound state consistent with the $X(3860)$. The internal structure is found to be predominantly molecular for the $X(3872)$, while the $X(3860)$ and $Z(3930)$ have larger $c\bar{c}$ components. The coupling between $c\bar{c}$ cores and hadronic components plays a crucial role in generating these states. The resulting wave functions provide insight into the internal structure and decay properties of these exotic states.

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Kotaro Miyake, Yasuhiro Yamaguchi. 2025-07-29. Hadronic Molecules and $\chi_{cJ}(2P)$ Coupled States. https://doi.org/10.22323/1.500.0060

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