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| Format: | Preprint |
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2026
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| Accès en ligne: | https://arxiv.org/abs/2603.21667 |
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| _version_ | 1866910065215143936 |
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| author | Chen, Fei-Yu Li, Ning Chen, Wei |
| author_facet | Chen, Fei-Yu Li, Ning Chen, Wei |
| contents | We investigate isospin-breaking effects in double-charm molecular pentaquarks with the $D^{(*)}Σ_c^{(*)}$ configuration, using the one-boson-exchange potential framework. In these systems, the isospin-breaking effects arise from two sources: the strong interaction, which manifests as the threshold difference of the $D^{(*)}Σ_c^{(*)}$ components in the same isospin multiplet and the mass splittings of the exchanged isovector mesons ($π$ and $ρ$); and the electromagnetic interaction between charged $D^{(*)}$ and $Σ_c^{(*)}$ components. We calculate the binding properties and the isospin mixing angle between the $I=1/2$ and $I=3/2$ states of the $D^{(*)}Σ_c^{(*)}$ system. Our results show that the isospin-breaking effect contributes a significant correction of roughly $10\%-30\%$ to the binding energy. This effect is particularly pronounced in loosely bound molecular candidates, which are characterized by small binding energies and large root-mean-square radii. We therefore conclude that the explicit inclusion of isospin-breaking effects is essential for achieving the precision in theoretical calculations necessary to match rapidly advancing experimental programs. Our results are expected to provide valuable guidance for future high-precision experimental studies of deuteron-like molecular states. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_21667 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Isospin-breaking effects of the double-charm molecular pentaquarks Chen, Fei-Yu Li, Ning Chen, Wei High Energy Physics - Phenomenology High Energy Physics - Experiment We investigate isospin-breaking effects in double-charm molecular pentaquarks with the $D^{(*)}Σ_c^{(*)}$ configuration, using the one-boson-exchange potential framework. In these systems, the isospin-breaking effects arise from two sources: the strong interaction, which manifests as the threshold difference of the $D^{(*)}Σ_c^{(*)}$ components in the same isospin multiplet and the mass splittings of the exchanged isovector mesons ($π$ and $ρ$); and the electromagnetic interaction between charged $D^{(*)}$ and $Σ_c^{(*)}$ components. We calculate the binding properties and the isospin mixing angle between the $I=1/2$ and $I=3/2$ states of the $D^{(*)}Σ_c^{(*)}$ system. Our results show that the isospin-breaking effect contributes a significant correction of roughly $10\%-30\%$ to the binding energy. This effect is particularly pronounced in loosely bound molecular candidates, which are characterized by small binding energies and large root-mean-square radii. We therefore conclude that the explicit inclusion of isospin-breaking effects is essential for achieving the precision in theoretical calculations necessary to match rapidly advancing experimental programs. Our results are expected to provide valuable guidance for future high-precision experimental studies of deuteron-like molecular states. |
| title | Isospin-breaking effects of the double-charm molecular pentaquarks |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2603.21667 |