Decay constants of the two-pole D_0^*(2300)

Abstract

The nature of the scalar charmed meson D₀^*(2300) remains one of the most intriguing questions in hadron spectroscopy. A prominent interpretation is a two-pole structure generated by the coupled channels Dπ, Dη, D_sK̅, and Dη', in which the lower pole couples mainly to Dπ and the higher pole to D_sK̅. Following this picture, we calculate the decay constants of these two poles using the effective Lagrangian approach. The resulting values, f_D₀^*^(lower)=68.46^+0.93_−1.25 MeV and f_D₀^*^(higher)=90.51^+5.91_−11.64 MeV, are substantially smaller than those predicted by conventional cq̅ excited-state scenarios. This difference suggests that decay constants can serve as a sensitive probe to discriminate between different internal structures of the D₀^*(2300). As a phenomenological application, we further predict the branching fractions for the Cabibbo-favored decays B_s → D_s D₀^*, Λ_b → Λ_c D₀^*, and Ξ_b → Ξ_c D₀^* within the factorization approach. These predictions provide crucial tests to validate the two-pole interpretation of the D₀^*(2300).

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BibTeX RIS

BibTeX

@misc{yuan2026decay,
  title = {{Decay constants of the two-pole $D_0^*(2300)$}},
  author = {Qi-Wei Yuan and Jia-Ting Zhang and Ming-Zhu Liu},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2607.24550},
  eprint = {2607.24550},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2607.24550},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Decay constants of the two-pole D_0^*(2300)
AU  - Qi-Wei Yuan
AU  - Jia-Ting Zhang
AU  - Ming-Zhu Liu
PY  - 2026
DA  - 2026/10/31
PB  - arXiv
DO  - 10.48550/arxiv.2607.24550
UR  - https://arxiv.org/abs/2607.24550
AB  - The nature of the scalar charmed meson D_0^*(2300) remains one of the most intriguing questions in hadron spectroscopy. A prominent interpretation is a two-pole structure generated by the coupled channels Dπ, Dη, D_sK̅, and Dη', in which the lower pole couples mainly to Dπ and the higher pole to D_sK̅. Following this picture, we calculate the decay constants of these two poles using the effective Lagrangian approach. The resulting values, f_D_0^*^(lower)=68.46^+0.93_−1.25 MeV and f_D_0^*^(higher)=90.51^+5.91_−11.64 MeV, are substantially smaller than those predicted by conventional cq̅ excited-state scenarios. This difference suggests that decay constants can serve as a sensitive probe to discriminate between different internal structures of the D_0^*(2300). As a phenomenological application, we further predict the branching fractions for the Cabibbo-favored decays B_s → D_s D_0^*, Λ_b → Λ_c D_0^*, and Ξ_b → Ξ_c D_0^* within the factorization approach. These predictions provide crucial tests to validate the two-pole interpretation of the D_0^*(2300).
ER  -

Decay constants of the two-pole D₀^*(2300)

Abstract

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