A doubly charmed strange molecule from coupled-channel dynamics

Abstract

We investigate a doubly charmed molecular state T_ccs̅ with C=+2, 𝒮=+1, and I=1/2 in an off-shell coupled-channel formalism. Constructing the interaction kernel from a meson-exchange model based on an effective Lagrangian and solving the coupled-channel scattering equation in the Blankenbecler-Sugar reduction, we find a pole only for J^P=1⁺ among J^P=0^±, 1^±, and 2^±. With the reduced cutoff mass of $600$~MeV, we obtain a mass of $3972.90$~MeV, which corresponds to a binding energy of $4.01$~MeV relative to the D^*D_s threshold. Examining the relative signs and magnitudes of the S-wave channel couplings extracted from the pole residues, we demonstrate that the pole belongs predominantly to the triplet (3_A) representation. We also discuss the relevance of heavy-quark spin symmetry to the bound state.

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BibTeX RIS

BibTeX

@misc{kim2026doubly,
  title = {{A doubly charmed strange molecule from coupled-channel dynamics}},
  author = {Hee-Jin Kim and Hyun-Chul Kim},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.39143},
  eprint = {2610.39143},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.39143},
}

RIS

TY  - UNPB
TI  - A doubly charmed strange molecule from coupled-channel dynamics
AU  - Hee-Jin Kim
AU  - Hyun-Chul Kim
PY  - 2026
DA  - 2026/10/29
PB  - arXiv
DO  - 10.48550/arxiv.2610.39143
UR  - https://arxiv.org/abs/2610.39143
AB  - We investigate a doubly charmed molecular state T_ccs̅ with C=+2, 𝒮=+1, and I=1/2 in an off-shell coupled-channel formalism. Constructing the interaction kernel from a meson-exchange model based on an effective Lagrangian and solving the coupled-channel scattering equation in the Blankenbecler-Sugar reduction, we find a pole only for J^P=1^+ among J^P=0^±, 1^±, and 2^±. With the reduced cutoff mass of $600$~MeV, we obtain a mass of $3972.90$~MeV, which corresponds to a binding energy of $4.01$~MeV relative to the D^*D_s threshold. Examining the relative signs and magnitudes of the S-wave channel couplings extracted from the pole residues, we demonstrate that the pole belongs predominantly to the triplet (3_A) representation. We also discuss the relevance of heavy-quark spin symmetry to the bound state.
ER  -

Abstract

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