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PreprintCC BY 4.0arXiv

Identification of Ds1(2933) as the 2P1 state in the quark model

  • Jun Wang
  • Qiang Zhao
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Abstract

We investigate the internal structure of the newly observed charm-strange meson Ds1(2933)+, which was reported by the LHCb Collaboration in B0→ D+D−K+π−, in the quark model by treating it as the 2P1 state of the cs̅ system. The coupled-channel corrections to the 1P1--3P1 mass matrix are evaluated through the two-point self-energy loops involving the DK*, D*K, D*K*, Dsϕ, Ds*ϕ and Ds*η intermediate channels. Requiring the corrected eigenvalue to reproduce the measured mass yields a cutoff scale of about 0.82 GeV, a 2P1′ partner state at 3012 MeV, and a mixing angle of −12.9∘ that deviates significantly from the heavy-quark ideal-mixing angle. Moreover, the predicted three-body branching ratio fraction Rth=1.98 for Ds1(2933)→ D+K+π− via the DK* and D2*K intermediate states is consistent with the experimental value Rexp=1.27+1.29−0.95 within uncertainties. These results support the assignment of Ds1(2933) as the 2P1 excited state of the cs̅ system with final state interactions.

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Cite

BibTeXRIS
BibTeX
@misc{wang2026identification,
  title = {{Identification of $D_s1(2933)$ as the $2P_1$ state in the quark model}},
  author = {Jun Wang and Qiang Zhao},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.32586},
  eprint = {2609.32586},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.32586},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Identification of D_s1(2933) as the 2P_1 state in the quark model
AU  - Jun Wang
AU  - Qiang Zhao
PY  - 2026
DA  - 2026/09/26
PB  - arXiv
DO  - 10.48550/arxiv.2609.32586
UR  - https://arxiv.org/abs/2609.32586
AB  - We investigate the internal structure of the newly observed charm-strange meson D_s1(2933)^+, which was reported by the LHCb Collaboration in B^0→ D^+D^−K^+π^−, in the quark model by treating it as the 2P_1 state of the cs̅ system. The coupled-channel corrections to the ^1P_1--^3P_1 mass matrix are evaluated through the two-point self-energy loops involving the DK^*, D^*K, D^*K^*, D_sϕ, D_s^*ϕ and D_s^*η intermediate channels. Requiring the corrected eigenvalue to reproduce the measured mass yields a cutoff scale of about 0.82 GeV, a 2P_1^′ partner state at 3012 MeV, and a mixing angle of −12.9^∘ that deviates significantly from the heavy-quark ideal-mixing angle. Moreover, the predicted three-body branching ratio fraction R_th=1.98 for D_s1(2933)→ D^+K^+π^− via the DK^* and D_2^*K intermediate states is consistent with the experimental value R_exp=1.27^+1.29_−0.95 within uncertainties. These results support the assignment of D_s1(2933) as the 2P_1 excited state of the cs̅ system with final state interactions.
ER  -