Radiative decays of the predicted P-wave DD̅* molecular state: The 0−+ case
Abstract
In the present work, we study the radiative decays of the P-wave DD̅* molecular state G0 with IG(JPC)=0+(0−+) using a phenomenological Lagrangian approach. The molecular coupling is fixed by the compositeness condition with a Gaussian form factor. The partial widths for G0→ γγ, γJ/ψ, γψ(2S), γhc, γρ, and γω are evaluated. Our results show that the two-photon and γhc channels are highly suppressed, while γJ/ψ, γψ(2S), and γρ are of the order of a few keV, and γω reaches several tens of keV, making it the dominant radiative mode. The ratios Γ(G0 → γψ(2S))/Γ(G0 → γJ/ψ) and Γ(G0 → γω)/Γ(G0 → γρ) are predicted to be 1−2.6 and 3.4−5.4, respectively, with mild parameter dependence. We also compare with hadronic decays and find that the total radiative decay width is lower than the hadronic decay widths by about one order of magnitude. We propose searching for G0 in the sequential decay Y(4230)→ γG0 → γωJ/ψ, which is accessible to further experimental measurements by the BESIII, Belle II and LHCb Collaborations.
Versions
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BibTeX
@misc{wu2026radiative,
title = {{Radiative decays of the predicted P-wave $D\barD^*$ molecular state: The $0^-+$ case}},
author = {Qi Wu and Ming-Qi Cui and Zi-Li Yue and Dian-Yong Chen and Shi-Dong Liu and Gang Li},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2609.17038},
eprint = {2609.17038},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.17038},
}
RIS
TY - UNPB
TI - Radiative decays of the predicted P-wave DD̅^* molecular state: The 0^−+ case
AU - Qi Wu
AU - Ming-Qi Cui
AU - Zi-Li Yue
AU - Dian-Yong Chen
AU - Shi-Dong Liu
AU - Gang Li
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2609.17038
UR - https://arxiv.org/abs/2609.17038
AB - In the present work, we study the radiative decays of the P-wave DD̅^* molecular state G_0 with I^G(J^PC)=0^+(0^−+) using a phenomenological Lagrangian approach. The molecular coupling is fixed by the compositeness condition with a Gaussian form factor. The partial widths for G_0→ γγ, γJ/ψ, γψ(2S), γh_c, γρ, and γω are evaluated. Our results show that the two-photon and γh_c channels are highly suppressed, while γJ/ψ, γψ(2S), and γρ are of the order of a few keV, and γω reaches several tens of keV, making it the dominant radiative mode. The ratios Γ(G_0 → γψ(2S))/Γ(G_0 → γJ/ψ) and Γ(G_0 → γω)/Γ(G_0 → γρ) are predicted to be 1−2.6 and 3.4−5.4, respectively, with mild parameter dependence. We also compare with hadronic decays and find that the total radiative decay width is lower than the hadronic decay widths by about one order of magnitude. We propose searching for G_0 in the sequential decay Y(4230)→ γG_0 → γωJ/ψ, which is accessible to further experimental measurements by the BESIII, Belle II and LHCb Collaborations.
ER -