Strong decays of the hidden-charm molecular pentaquarks
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| Format: | Preprint |
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2026
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| _version_ | 1866911538021924864 |
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| author | Deng, Jin-Cheng Ru, Yong Wan, Xin-Yue Feng, Tai-Fu Wang, Bo |
| author_facet | Deng, Jin-Cheng Ru, Yong Wan, Xin-Yue Feng, Tai-Fu Wang, Bo |
| contents | We investigate the strong decays of the recently observed hidden-charm pentaquarks \(P_ψ^N(4312)\), \(P_ψ^N(4440)\), and \(P_ψ^N(4457)\), as well as \(P_{ψs}^Λ(4338)\) and \(P_{ψs}^Λ(4459)\), within the molecular framework using the effective Lagrangian approach. We construct the effective Lagrangians describing the S-wave couplings between these pentaquarks and their constituent hadrons, namely \(Σ_c\bar{D}^{(*)}\) and \(Ξ_c\bar{D}^{(*)}\), and determine the coupling constants via the residues of the scattering \(T\)-matrix at the bound-state poles. Our results show that the decay widths are sensitive to the cutoff parameters in the form factors, whereas the branching fractions exhibit only weak dependence. Using \(P_ψ^N(4312)\) to calibrate the cutoff range, we further explore the spin assignments of \(P_ψ^N(4440)\) and \(P_ψ^N(4457)\). Our calculations favor the assignment where the lower-mass state \(P_ψ^N(4440)\) carries higher spin \(J = 3/2\) and the higher-mass state \(P_ψ^N(4457)\) carries lower spin \(J = 1/2\). In addition, the experimental widths of \(P_{ψs}^Λ(4338)\) and \(P_{ψs}^Λ(4459)\) can both be well reproduced under the molecular interpretation. We look forward to future experimental analyses with more accumulated data to clarify whether the lineshape of \(P_{ψs}^Λ(4459)\) contains contributions from both spin-\(1/2\) and spin-\(3/2\) states. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_21738 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Strong decays of the hidden-charm molecular pentaquarks Deng, Jin-Cheng Ru, Yong Wan, Xin-Yue Feng, Tai-Fu Wang, Bo High Energy Physics - Phenomenology We investigate the strong decays of the recently observed hidden-charm pentaquarks \(P_ψ^N(4312)\), \(P_ψ^N(4440)\), and \(P_ψ^N(4457)\), as well as \(P_{ψs}^Λ(4338)\) and \(P_{ψs}^Λ(4459)\), within the molecular framework using the effective Lagrangian approach. We construct the effective Lagrangians describing the S-wave couplings between these pentaquarks and their constituent hadrons, namely \(Σ_c\bar{D}^{(*)}\) and \(Ξ_c\bar{D}^{(*)}\), and determine the coupling constants via the residues of the scattering \(T\)-matrix at the bound-state poles. Our results show that the decay widths are sensitive to the cutoff parameters in the form factors, whereas the branching fractions exhibit only weak dependence. Using \(P_ψ^N(4312)\) to calibrate the cutoff range, we further explore the spin assignments of \(P_ψ^N(4440)\) and \(P_ψ^N(4457)\). Our calculations favor the assignment where the lower-mass state \(P_ψ^N(4440)\) carries higher spin \(J = 3/2\) and the higher-mass state \(P_ψ^N(4457)\) carries lower spin \(J = 1/2\). In addition, the experimental widths of \(P_{ψs}^Λ(4338)\) and \(P_{ψs}^Λ(4459)\) can both be well reproduced under the molecular interpretation. We look forward to future experimental analyses with more accumulated data to clarify whether the lineshape of \(P_{ψs}^Λ(4459)\) contains contributions from both spin-\(1/2\) and spin-\(3/2\) states. |
| title | Strong decays of the hidden-charm molecular pentaquarks |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2603.21738 |