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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2512.08643 |
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| _version_ | 1866917135246163968 |
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| author | An, Hong-Tao Li, Yu-Shuai |
| author_facet | An, Hong-Tao Li, Yu-Shuai |
| contents | Building upon the discoveries of the $Ξ^{++}_{cc}(3621)$ and $T^{+}_{cc}(3875)$, we undertake a comprehensive investigation into the mass spectra, internal structures, and decay properties of doubly-charmed pentaquarks. By treating the two light quarks as a tightly bound diquark, the five-body system reduces to a four-body heavy quark-heavy quark-diquark-antiquark configuration. Within the constituent quark model framework, we calculate their mass spectra in the range of 4.7-5.4 GeV and corresponding internal mass contributions via the Gaussian expansion method. The root-mean-square radii, typically between 1.1-1.6 fm, indicate compact spatial structures. Furthermore, we also calculate the rearrangement decay widths via the quark-interchange model, finding that all states are unstable and decay into a singly-charmed baryon and a singly-charmed meson. Several narrow resonances have been identified, some of which have a total width even below 10 MeV. We hope that our study could provide valuable guidance for future theoretical investigations and experimental searches targeting doubly-charmed pentaquarks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_08643 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Systematic investigation of the spectroscopy and decay behaviors of doubly-charmed pentaquarks An, Hong-Tao Li, Yu-Shuai High Energy Physics - Phenomenology Building upon the discoveries of the $Ξ^{++}_{cc}(3621)$ and $T^{+}_{cc}(3875)$, we undertake a comprehensive investigation into the mass spectra, internal structures, and decay properties of doubly-charmed pentaquarks. By treating the two light quarks as a tightly bound diquark, the five-body system reduces to a four-body heavy quark-heavy quark-diquark-antiquark configuration. Within the constituent quark model framework, we calculate their mass spectra in the range of 4.7-5.4 GeV and corresponding internal mass contributions via the Gaussian expansion method. The root-mean-square radii, typically between 1.1-1.6 fm, indicate compact spatial structures. Furthermore, we also calculate the rearrangement decay widths via the quark-interchange model, finding that all states are unstable and decay into a singly-charmed baryon and a singly-charmed meson. Several narrow resonances have been identified, some of which have a total width even below 10 MeV. We hope that our study could provide valuable guidance for future theoretical investigations and experimental searches targeting doubly-charmed pentaquarks. |
| title | Systematic investigation of the spectroscopy and decay behaviors of doubly-charmed pentaquarks |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2512.08643 |