Abstract
Motivated by the first observation of the double-charm tetraquark by the LHCb Collaboration, we investigate the nature of as an isoscalar hadronic molecule in a meson-exchange potential model incorporated by the coupled-channel effects and three-body unitarity. The invariant mass spectrum can be well-described and the 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 can shed light on the binding of its heavy-quark spin symmetry (HQSS) partner () and on the nature of other heavy hadronic molecule candidates such as and in the charmed-anticharmed systems. The latter states can be related to 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 and systems.
4 More- Received 21 November 2023
- Accepted 14 March 2024
DOI:https://doi.org/10.1103/PhysRevD.109.076016
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society