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PreprintCC BY 4.0arXiv

BsJ(6114) as a Higher-Partial-Wave K̅*B(*) Molecular Candidate

  • Shiquan Zhang
  • Dan Jiang
  • Yin Huang
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Abstract

In 2021, the LHCb Collaboration observed the BsJ(6114) state in the B± K∓ invariant mass spectrum. It is currently the highest-mass bottom-strange state listed by the Particle Data Group (PDG). However, its spin-parity quantum numbers have not yet been experimentally determined, and its internal structure remains under debate. Although several quark-model interpretations have been proposed, including the 13D1 state and a member of the 1D(2-,3-) doublet, the possibility of a hadronic molecular structure for this state has not yet been systematically investigated. We investigate the possibility of interpreting BsJ(6114) as a B(*)K̅* molecular state within the one-boson-exchange model. By solving the Schrödinger equation using the Gaussian expansion method, we study the bound-state properties with different spin-parity assignments, taking into account partial-wave mixing and coupled-channel effects. We further calculate the strong decay widths into the allowed B(*)K̅ channels and compare them with the experimental data. Our results show that the mass spectrum alone cannot uniquely determine the spin-parity of BsJ(6114). However, the decay-width analysis disfavors the JP=0+, 0-, 1+, 2+, and 3- assignments, while the JP=1-, 2-, and 3+ configurations remain compatible with the experimental constraints. Among these possibilities, the JP=1- assignment provides the best agreement with the measured decay width. These findings suggest that BsJ(6114) may be a higher-partial-wave B(*)K̅* molecular state.

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Cite

BibTeXRIS
BibTeX
@misc{zhang2026bsj6114,
  title = {{$B_sJ(6114)$ as a Higher-Partial-Wave $\barK^*B^(*)$ Molecular Candidate}},
  author = {Shiquan Zhang and Dan Jiang and Yin Huang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.29354},
  eprint = {2610.29354},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.29354},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - B_sJ(6114) as a Higher-Partial-Wave K̅^*B^(*) Molecular Candidate
AU  - Shiquan Zhang
AU  - Dan Jiang
AU  - Yin Huang
PY  - 2026
DA  - 2026/10/21
PB  - arXiv
DO  - 10.48550/arxiv.2610.29354
UR  - https://arxiv.org/abs/2610.29354
AB  - In 2021, the LHCb Collaboration observed the B_sJ(6114) state in the B^± K^∓ invariant mass spectrum. It is currently the highest-mass bottom-strange state listed by the Particle Data Group (PDG). However, its spin-parity quantum numbers have not yet been experimentally determined, and its internal structure remains under debate. Although several quark-model interpretations have been proposed, including the 1^3D_1 state and a member of the 1D(2^-,3^-) doublet, the possibility of a hadronic molecular structure for this state has not yet been systematically investigated. We investigate the possibility of interpreting B_sJ(6114) as a B^(*)K̅^* molecular state within the one-boson-exchange model. By solving the Schrödinger equation using the Gaussian expansion method, we study the bound-state properties with different spin-parity assignments, taking into account partial-wave mixing and coupled-channel effects. We further calculate the strong decay widths into the allowed B^(*)K̅ channels and compare them with the experimental data. Our results show that the mass spectrum alone cannot uniquely determine the spin-parity of B_sJ(6114). However, the decay-width analysis disfavors the J^P=0^+, 0^-, 1^+, 2^+, and 3^- assignments, while the J^P=1^-, 2^-, and 3^+ configurations remain compatible with the experimental constraints. Among these possibilities, the J^P=1^- assignment provides the best agreement with the measured decay width. These findings suggest that B_sJ(6114) may be a higher-partial-wave B^(*)K̅^* molecular state.
ER  -